The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Table of Contents
 A Power System Operation and Management···································1
 B Power System Analysis，Protection and Control·····························34
 C High Voltage Transmission Technology······································79
 D New Energy Power Generation and Microgrid Technology···············94
 E Smart Grid Technology························································120
 F Energy Internet and New Emerging Technologies·························130
I
November 26-29，2015 Changsha，China
Associate Editor
Bin li
Bin Wang
Can Huang
Canbing Li
Chongqing Kang
Chuangxin Guo
Chunming Tu
Ci Tang
Delin Wang
Gang Li
Gangui Yan
Haijing Yang
Haoyong Chen
Hongjie Jia
Hongming Yang
Houhe Chen
Hualiang Fang
Huiming Xu
Jianfei Ji
Jianhua Zhang
Jie Yu
Jinghan He
Jinyu Wen
Jun Liang
Junhui Zhao
Kaigui Xie
Li Ren
Lina Wang
Linquan Bai
Mingchao Xia
Qinran Hu
Renjun Zhou
Richeng Luo
Rui Ma
Sheng Lin
Tianshu Bi
Tianyuan Tan
Wei Gu
Wei Yao
Wen Wang
Tianjin University
Tsinghua University
The University of Tennessee
Hunan University
Tsinghua University
Zhejiang University
Hunan University
Changsha University of Science and Technology
Southwest Jiaotong University
Jilin University
North China Electric Power University
State Grid Henan Electric Power Research Institute
South China University of Technology
Tianjin University
Changsha University of Science and Technology
Northeast Dianli University
Wuhan University
State Grid Information and Telecommunication Branch
State Grid Corporation of China
North China Electric Power University Beijing
Southeast University
Beijing Jiaotong University
Huazhong University of Science and Technology
Cardiff University
University of New Haven
Chongqing University
Huazhong University of Science and Technology
Beihang University
University of Tennessee
Beijing Jiaotong University
The University of Tennessee Knoxville
Changsha University of Science and Technology
Changsha University of Science and Technology
Changsha University of Science and Technology
Southwest Jiaotong University
North China Electric Power University
Wuhan University
Southeast University
Huazhong University of Science and Technology
Changsha University of Science and Technology
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Wenpeng Luan
Xiangjun Zeng
Xiangning Lin
Xianyong Xu
Xin Fang
Xin Tang
Yandong Chen
Yao Xu
Yigang He
Yuanyuan Wang
Yusheng Zhou
Zaibin Jiao
Zewen Li
Zhikang Shuai
Zhiliang Zhang
Zhiqian Bo
Zifa Liu
China Electric Power Research Institute
Changsha University of Science and Technology
Huazhong University of Science and Technology
Hunan Electric Power Research Institute
University of Tennessee at Knoxville
Changsha University of Science and Technology
Hunan University
Lamar University
Hefei University of Technology
Changsha University of Science and Technology
Changsha University of Science and Technology
Xi'an Jiaotong University
Changsha University of Science and Technology
Hunan University
Nanjing University of Aeronautics and Astronautics
XUJI Group of SGCC
North China Electric Power University
November 26-29，2015 Changsha，China
II
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
method can estimate and compare the sensitivity of commonly-used primary equipments in power system directly, satisfying the needs for maintenance strategy better.
A: Power System Operation and
Management
TuA02.2
TuA01.1
Analysis of the Impact of Voltage on the Loss
Allocation Method Based on Circuit Theory pp.
12-16
Analysis Correlation Modeling of the O il Flow of
Transformer and Temperature
pp. 1-5
Dongri Yan
Changsha University of Science and Technology
Rui Ma
Changsha University of Science and Technology
Haijing Yang
State Grid HAEPC Electric Power Research Institute
Zeqian Mao
Shandong University
Li Zhang
Shandong University
Xueshan Han
Shandong University
Ji Feng
Shandong University
Effect of voltage hasn’t been considered reasonably in existing
loss allocation methods. Aiming at the problem, the impact of
voltage on the loss allocation method based on circuit theory is
deeply discussed in this paper. Firstly, the two node equivalence modes and principles of the branch loss allocation method are investigated. Then the relationship between voltage and
the loss under different node equivalence modes is analyzed on
the premise that all nodes’ injection currents are fixed, so as to
keep the influence of current on loss allocation constantly at
different voltage levels. The analysis and simulations reveal
that none of the methods can reflect the effect of voltage on loss
allocation, and this is due to node equivalence rather than
branch allocation principle. So a more reasonable node equivalence should be developed to reflect the influence of voltage
on loss allocation.
Yongchao Liang Human Electric Examine and Repair Company
Transformer oil is the main insulation and heat dissipation
medium of oil immersed transformer, its flow velocity, pressure
and density distribution has a significant effect on transformer
insulation and heat dissipation performance. Based on this,
this paper has deduced the relationship between the oil flow
velocity and the instantaneous temperature field of the transformer, and the mathematical model. The simulation results
reveal the relationship between the fault of the transformer
and the flow velocity of the oil, and provide the theoretical
basis and simulation platform for the study of the digital gas
protection based on the fault characteristics. In addition, analyze the relationship between the temperature of inlet oil flow
and the load factor and the temperature rise in the transformer,
providing a good base for studying the setting value of the
transformer gas relay.
TuA02.5
The Evolutionary Game of Electric Power Market
Including Renewable Resource Generation
pp. 17-22
TuA02.1
An Improved Algorithm for Power System
Reliability Sensitivity Analysis
pp. 6-11
Yan Zhao
Electric Power Exchange Centers State Grid
Shanghai Municipal Electric Power Company
Zhihong Guo
State Grid Shandong Electric Power Company
School of Electrical Engineering and Information
Hui Wang
State Grid Shandong Electric Power Company
Sichuan University
Yong Wang
Shandong University
Guojing Liu
Shandong University
Yeyong Li
Jichun Liu
School of Electrical Engineering and Information
Sichuan University
Shandong University
The Future Renewable Electric Energy Delivery and Management (FREEDM) systems provide a promising solution to
accommodate the high penetration of intermittent renewable
energy resources by energy internet. As the intelligent power
distribution system, the FREEDM systems allow users to use
their own Distributed Generation (DG) and load to participate
in the competitive electricity market. In this paper, we first
assume the users have the DG and elastic load. Then we establish the three layers evolutionary game model including customer-side , supply–side and generation–side under the condition of incomplete information. Lastly, we realize the simulation of evolutionary game for eight-bus system by multi-agent
The power system reliability sensitivity analysis can recognize
weak parts of the system. It is significant for system reliability
assessment and enhancement. Against deficiencies in conventional reliability sensitivity analysis, this paper proposes an
improved method by analyzing graphical representations of
sensitivity and practical engineering requirements. This method meets real needs better and keeps the calculating errors of
reliability indices from impacting results of component sensitivity assessment effectively. What’s more, cooperating with the
generalized power network reliability analysis, the suggested
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November 26-29，2015 Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
technology and reinforcement learning algorithm. The results
of simulation verify the validity of the proposed model and
method.
model in the wholesale market, while the renewable companies
behave in accordance with supply function model in the TGC
market. This model can be formulated as an equilibrium
problem with equilibrium constraints (EPEC) and is solved by
the nonlinear complementarity approach. The simulation results show that, when the RPS is relatively low, renewable
companies tend to withhold some of TGCs to raise the TGC
price. Nevertheless, when the RPS is relatively high, renewable
companies have few TGCs to withhold, and they may choose to
reduce their wholesale electricity output, so as to reduce the
amount of TGCs and raise the TGC price. These strategic behaviors will raise the electricity market price, and have negative impacts on the market efficiency.
TuA02.6
Power Losses Allocation for Bilateral Electricity
Transactions based on Transaction Power Traci ng
pp. 23-28
Jianhu Lv
Nanjing Branch of China Electric Power Research
Institute State Grid Corporation of China
TuA02.8
Chunbo Huang Nanjing Branch of China Electric Power Research
Institute State Grid Corporation of China
Jun Xu
Analysis of an Electricity Market Equilibrium
Model with Penalties for W ind Power ’s Bidding
Deviation
pp. 35-40
Nanjing Branch of China Electric Power Research
Institute State Grid Corporation of China
Xiao Wang
North China Electric Power University
Ming Zhou
North China Electric Power University
Mengtao Huang
To power loss allocation for bilateral electricity transaction, a
novel transaction power tracing based allocation method is put
forward. Based on the method, this paper firstly introduces a
framework for explicitly modeling bilateral transactions and
specified contract paths through transforming the meshed
network into tree type network. With the proposed method, it
is possible to trace transaction power in the physical network,
then transmission losses is partitioned to each transaction reasonably. The simulation on 5-bus system validated the equity
and validity of the proposed method. The result shows the
proposed allocation method leads to a more accurate reflection
of quantity and distance of each transaction, and considers
parallel flow and loop flow simultaneously.
Shanghai University
Xian Wang
Shanghai University
Shaohua Zhang
Shanghai University
In an electricity market with strategic bidding of wind power,
penalties are applied whenever the delivered wind power deviates from the bid. In order to investigate the impacts of bidding deviation penalties on wind firm’s bidding behaviors, a
stochastic Cournot equilibrium model is presented. In this
model, a scenario reduction technique is employed to describe
the uncertainty of wind speed. We use nonlinear complementarity methods to solve this model. Then numerical examples are
given to verify the reasonableness and effectiveness of the proposed model. It is shown that the penalty mechanism stimulates wind firms to reduce bidding error. This conduces to
market regulators to mitigate wind firms’ bidding deviations
through appropriate penalty.
TuA02.7
Joint Equilibrium Analysis of Electricity Market
with Tradable Green Certificates
pp. 29-34
TuA02.9
Application of Robust Optimization Theory to
Generation Asset Allocation
pp. 41-46
Xuena An
Shanghai University
Chen Zhao
Shanghai University
Shaohua Zhang
Shanghai University
Jie Zhou
Shanghai University
Xue Li
Shanghai University
Chen Zhao
Shanghai University
Shaohua Zhang
Shanghai University
Xue Li
Shanghai University
Renewable portfolio standard (RPS) and tradable green certificate (TGC) schemes are important mechanisms to promote
the development of renewable energy. In order to investigate
the impacts of RPS and TGC schemes on the electricity
wholesale market competition, a joint equilibrium model considering the oligopolistic TGC market is proposed in the paper
based on the oligopoly competition equilibrium theory. Therein
all generation companies behave in accordance with cournot
November 26-29，2015 Changsha，China
In the deregulated electricity market, the generation company
(Genco) can sell energy through several trading choices such as
the wholesale spot market, bilateral contracts and option contracts. These trading choices have different risk characteristics.
To achieve a satisfactory risk-return target, the Genco should
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
allocate the electricity among these trading choices reasonably.
A robust optimization based risk management model is proposed for Genco’s generation asset allocation under uncertain
spot market prices. In this model, the robust profit (RP) and
conditional robust profit (CRP) are used to describe Genco’s
profit under a certain confidence level. The objective of the
Genco’s generation asset allocation problem is to maximize
Genco’s CRP. With this method, different allocation strategies
can be made for Genco’s different attitudes toward risk. The
Monte Carlo simulation-based numerical examples are presented to validate the reasonableness and effectiveness of proposed model.
Power allocation into decision-making model plays a valuable
role for the power supply company to mitigate price risks and
improve their profitability in electricity market environment.
In this paper, we develop a power allocation model based on
the prospect theory, which considers the psychological factors
of decision-making in reality, through calculating the value of
electricity purchasing business function and weighting function
retrieves the maximum number of prospects for the utility as
the optimal allocation scheme. The results show that the risk
preferences of the real decision makers will change along with
the psychological expectations, the power allocation strategy is
more conform to the actual decision model of decision makers
compared with the traditional power allocation model.
TuA02.10
TuA02.12
An Evaluation Method of Utilization Efficiency of
Power Grid Equipment Based on Three Stage
DEA Model
pp. 47-53
Yuheng Guan
South China University of Technology
Wen Sun
Guangdong Power Grid Corporation
Yue Zhang
Guangdong Power Grid Corporation
Pricing Method for Cross-zone Electricity Trading
Curve
pp. 60-64
With the reform process of power system continuing to accelerate, the input-output efficiency of power grid enterprises is
getting more and more attention. In order to get scientific,
objective and accurate evaluation results of inputoutput efficiency, improve the economic and social benefits of power grid
enterprises, the three stage DEA model is proposed to evaluate
the utilization efficiency of power grid equipment in this paper.
The first stage DEA evaluates the utilization efficiency of power grid equipment based on BCC-DEA and CCR-DEA model.
The second stage DEA utilizes stochastic frontier analysis
method to quantify the influence of environmental factors such
as the total number of GDP, the resident population and the
power supply area, and to modify input variables of DEA
model. The third stage makes the DEA evaluation again with
the adjusted input variables after SFA regression. This paper
chooses 19 cities' power supply bureaus as the empirical sample of Guangdong Power Grid Corporation and the results
verify the validity, effectiveness and reasonability of the model
and method which can provide reference for power grid enterprises to evaluate the utilization efficiency of power grid
equipment.
Jingjie Ma
Shanghai University
Chen Zhao
Shanghai University
Shaohua Zhang
Shanghai University
Libing Yang
State Grid Corporation of China
Xiaogang Li
State Grid Corporation of China
Renewable energy develops rapidly around the world. In China, to achieve fully use of renewable energy, the scale of
cross-zone renewable electricity trading increases constantly.
In addition, the difference between peak and base load increases year by year. As a result, the base-load cycling problem
is getting worse. This problem imposes negative impacts on the
utilization of renewable energy during the base-load period. To
mitigate the base-load cycling problem, it is crucial that mutual relief of base-load cycling capability should be achieved
among provinces in the import zone and good cycling characteristics of the cross-zone electricity trading curve provided by
the export zone.
TuA02.13
Optimization of Cross-Regional Bilateral Power
Transaction and Analysis of Transaction Path
pp. 65-70
Jun Xu
TuA02.11
China Electric Power Research Institute
Jianhu Lv
Allocation Strategy Based On Prospect Theory
For Power Supplier
pp. 54-59
Bing Lu
Shanghai University
Chen Zhao
Shanghai University
Shaohua Zhang
Shanghai University
China Electric Power Research Institute
Minghui Zhu
Xi’an Jiaotong University
Jianxue Wang
Xi’an Jiaotong University
Xian Zhang
State Grid Power Exchange Center
Cross-regional bilateral power transaction is an effective way
to solve the problem of energy distribution imbalance among
regions. The amount of power transaction, the price and the
transaction path is valuable for signing a power transaction
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November 26-29，2015 Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
contract. The common method for practical use is based on the
network flow approach which lacks the consideration of electrical property of power transaction. In this paper, a basic
model that considers the electrical property with the objective
of maximizing social welfare is introduced first. Then the basic
model is elaborated into a synthesized model through considering the function of auxiliary adjustment and transmission
cost. A practical method for settling power transaction path is
also proposed. Finally, a case study based on IEEE 30 was
performed to verify the applicability of the proposed model.
Results show that auxiliary adjustment and the proposed model do have positive effects on promoting the cross-regional bilateral transaction of electrical power.
Comparison on the similarities and differences
in demand side of capacity markets in different
countries
pp. 71-75
Xi’an Jiaotong University
Xiuli Wang
Xi’an Jiaotong University
Li Yao
Xi’an Jiaotong University
Xian Zhang
China Electric Power Research Institute
Jianhu Lv
China Electric Power Research Institute
A Risk Management Strategy for a W ind Power
Producer Based on Bilateral Contracts
pp. 82-86
Xi’an Jiaotong University
Xiuli Wang
Xi’an Jiaotong University
Furui Hou
Xi’an Jiaotong University
Li Yao
Xi’an Jiaotong University
Zece Zhang
Xi’an Jiaotong University
Zhu Li
China Electric Power Research Institute
Electric Power Trade Center
The integration of renewable energy is increasing rapidly in
electric energy systems throughout the world. This paper presents a bilateral contract model for wind power and provides a
risk management strategy for a wind power producer to trade
energy in spot market and bilateral contract market. It uses
long-term wind speed prediction to determine contract volume,
and uses short-term wind speed prediction to determine offers
submitted to spot market. Autoregressive moving average
model and autoregressive model are used to simulate wind
farm output and spot price series. Profit-at-Risk index is used
as a risk management metric. Simulation results of a case
study show that the purposed trading strategy can obviously
reduce financial risk of a wind power producer with the expected profit unchanged.
Probabilistic Assessment of Interregional Available Transfer Capability for Renewable Energy
Transactions
pp. 76-81
Xi’an Jiaotong University
Xi’an Jiaotong University
China Electric Power Research Institute
November 26-29，2015 Changsha，China
Zechen Wu
Chunbo Huang
TuA02.15
Haihua Cheng
Department of Power Exchange Center
TuA02.16
The 3rd Electricity reform in UK has been implemented which
includes capacity markets. Among many parts of capacity
market, the demand side is the key part for government imposing their force on promoting the market into the planned
direction which is to meet the reliability standard. This paper
gives a brief overview on demand side of capacity markets in
different countries, and compares creatively their similarities
and differences from the combination of reliability and market
perspective. The main similarities are the core of capacity
market and the force of government. And the differences focus
on the capacity mode, capacity requirement and the length of
capacity agreement. Finally, combined with the new electricity
reform in China, this paper gives some suggestions in demand
side for the future creation of capacity market in China according to the results from comparisons.
Jianxue Wang
Xian Zhang
Electric Power Trade Center
Jun Xu
Feng Li
China Electric Power Research Institute
This paper investigates a probabilistic assessment method for
calculating interregional available transfer capability (ATC) in
renewable energy transactions based on randomness and correlation of renewable energy. Firstly, the discrete joint probability model is established to consider wind power correlation
based on wind speed data of multiple wind farms. Then the
nonsequential Monte Carlo method is implemented to determine the evaluation state of numerous uncertainty factors such
as load fluctuations, equipment availabilities. As the assessment of ATC is susceptible to adjustment strategy of generator
output, the paper analyzes practical power adjustment strategies. An accelerated algorithm of mixed evaluation strategy is
proposed based on sensitivity and optimization adjustment
according to the changes of network configuration, which
compromises the calculation speed and accuracy. The
IEEE-RTS results verify the effectiveness of the improved
model and the proposed method.
TuA02.14
Furui Hou
Yaxian Zheng
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
to participate in bidding electricity market by managing
enormous quantity and dispersive air-conditioning load (AL),
which not only reduces load peak-valley difference, but also
provides the opportunity for AL to take part in power market
bidding. This work adopts reference price effect from behaviour economics to depict electricity consumption preference. A
bi-level optimization method is being established. The upper
level problem aims to maximize the social welfare, while the
lower level aims to maximize the ALA benefits based on consumers' preference. Karush–Kuhn–Tucker condition is being
applied to transfer the complex bi-level problem to a solvable
sing-level problem. Case studies are provided to verify the feasibility of proposed model.
TuA02.17
A Model for Analyzing Transaction Price Volatility of Generation Rights Trade Market Based on
Cellular Automata and Complex Network Theories
pp. 87-92
Yang Wu
Sichuan University
Junyong Liu
Sichuan University
Jichun Liu
Sichuan University
Yuan Huang
Sichuan University
Zhanxin Yan
Sichuan University
Li Zhang
Sichuan University
Hongjun Gao
Sichuan University
TuA02.19
Design of the Reserve Ancillary Service Market
Mechanism for the Micro-grid with Energy Storage
pp. 98-102
For the researches on the relationship between the influence
factors of the generation rights transaction price and the price
volatility are very few, the effects of individual behavior on the
price volatility of generation rights trade market are studied in
this paper based on cellular automata (CA) and complex networks (CN) theories. Firstly, the CA model of generation rights
trade market is proposed. Then, the behavior model of the
generation rights trader forecasting the coal price trends is
constructed based on CN theory. At last, depending on the
above two models, combining the transformation rules of generation rights trade CA with the behavior model, the model for
analyzing the price volatility of generation rights trade market
is established. The simulation results show that the individual
behavior is an important factor of causing price volatility of
generation rights trade market. It is verified that the relationship between the individual behavior and the price volatility of
generation rights trade market can be depicted clearly by the
proposed model, and it provides a new method for constructing
the model of influence factors of power generation rights trade
market by complex system theories.
Bo Yang
China Electric Power Research Institute
Jilei Ye
China Electric Power Research Institute
Jinhua Xue
China Electric Power Research Institute
Dan Lu
Hohai University
Haoming Liu
Chunlai Li
Hohai University
Qinghai Electric Power Corporation
In this paper, the foundation of the micro-grid ancillary service
market is introduced and some basic assumptions are made. In
view of the reserve ancillary service market, the market participants are analyzed, the benefits of energy storage providing
reserve generation are modeled, including the reserve capacity
benefit and reserve generation benefit, and the optimal clearing mechanism of the reserve ancillary service market is designed to minimize the customers’ total expense for reserve
capacity. The example shows that the participation of energy
storage and demand response in the ancillary service market is
helpful to reduce the total costs of the ancillary service market.
TuA02.18
TuA02.20
Bidding strategy analysis for air-conditional aggregator considering consumers' preference
pp. 93-97
Sanhua Zhang
Dynamic Restoration of the State of Charge for
the Battery Participating in Mutiple Markets Using Market Price Signals
pp. 103-107
Changsha University of Science and Technology
Hongming Yang
Changsha University of Science and Technology
Yongxi Zhang
Ming Li
The University of Sydney
Changsha University of Science and
Qiwei Zhai
The University of Sydney
Jin Ma
The University of Sydney
ZhaoYang Dong
The University of Sydney
Chao Lu
Tsinghua University
Technology
With the increasing use of Variable Renewable Energy (VRE)
resources and the recent advance of battery technologies, battery would likely become a non-generation alternative to par-
Considering the increment of air-conditional electricity consumption, air-conditioning load aggregators (ALA) are prone
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November 26-29，2015 Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
ticipate in the deregulated electricity markets. This paper focuses on utilizing batteries for providing frequency regulation
services and taking advantage of the short term price arbitrage(price spikes) in the spot market, because batteries have
quick response time, and price spikes and frequency regulation
services have similar time scales. Our experiment with real
market data demonstrates that the proposed dynamic State of
Charge (SoC) model makes much higher profits than a static
SoC operation model.
tomers participate in energy scheduling by providing load shift
resources. Compared to basic DR models, the proposed models
of LRDR and LTDR are extended with a refined description by
adding various constraints in the offer package. The actual
operation characteristics of DR resources are reflected in the
models. Besides, the day-ahead scheduling mode with DR is
studied. Finally, a co-optimized day-ahead energy/reserve
scheduling model integrated with DR which simultaneously
schedules energy and reserve is established. The effectiveness
of the proposed day-ahead scheduling model is verified on a
modified IEEE 118-bus system.
TuA03.1
TuA03.3
Capacity Credit Assessment of Renewable Distributed Generation in Active Distribution Systems Considering Demand Response Impact
pp. 108-113
A Comprehensive Decision Model for Optimal
Demand Response Program
pp. 121-126
Xiong Zheng
North China Electric Power University
Zhen Zhang
North China Electric Power University
Bo Zeng
North China Electric Power University
Yi Ren
North China Electric Power University
North China Electric Power University
Ming Zhou
North China Electric Power University
Geng Wu
Jianhua Zhang
North China Electric Power University
Ming Zeng
North China Electric Power University
Jinyue Shi
North China Electric Power University
In this paper, demand response (DR) is modeled based on price
elasticity and customer benefit function. A comprehensive decision model for DR based on Multiple Attribute Decision
Making (MADM) techniques is proposed to extract the priorities of DR programs and select the most effective program. The
proposed model includes the determination of attribute set,
calculation of attribute weight and comprehensive evaluation
of the alternatives. As for the attribute set, two new attributes,
namely the electricity consumption manner satisfaction index
and electricity cost expenditure satisfaction index, are introduced to consider customer's satisfaction. Besides, a combination weighting method is adopted to determine the weights of
attributes. To prioritize DR programs, a new sorting method
which combines Technique for Order Preference by Similarity
to Ideal Solution (TOPSIS) with Gray Correlation Analysis
(GCA) is proposed to overcome the decision bias due to the
limited information in the decision approach. The performance
of the proposed decision model is evaluated on a modified
IEEE 118-bus system.
The renewable distributed generation (RDG) has gained
booming development in the past decade, thus its capability to
displace conventional generation has become an urgent issue to
be studied for future power system planning. In this paper, the
capacity credit (CC) of RDG is investigated given an active
distribution system (ADS) context, wherein the impact of demand response (DR) is highlighted. To achieve this, the CC
index is first specified to cater for different operating modes of
ADS. On this basis, a generalized possibilistic-probabilistic
model is proposed for DR characterization. The CC is calculated using the sequential Monte-Carlo simulation (SMCS)
method, embedded with an adaptation strategy developed to
improve the computation efficiency. Numerical results on a
real multi-voltage distribution network show that the CC of
RDG varies with the energy mix in ADS and the presence of
DR could substantially improve the CC of RDG.
TuA03.4
A Calculation of Power Users’ Demand Response
Potential under the Angle of Big Data
pp. 127-134
TuA03.2
Joint Day-Ahead Energy and Reserve Scheduling
Model with Demand Response
pp. 114-120
Zhen Zhang
Ming Zhou
Tingting Lu
Jiangsu Provincial Key Laboratory of Smart Grid
Technology & Equipment
North China Electric Power University
Ciwei Gao
Jiangsu Provincial Key Laboratory of Smart Grid
North China Electric Power University
Qian Xu
State Grid Zhejiang Electric Power Company
Liying Sun
State Grid Zhejiang Electric Power Company
Technology & Equipment
Southeast University
Lingling Sun
Technology & Equipment
Two demand response (DR) programs, namely, load reduction
demand response (LRDR) program and load transfer demand
response (LTDR) program are both incorporated into the
day-ahead scheduling in this paper. The LRDR participants
provide load curtailment in energy scheduling and reserve
capacity in spinning reserve scheduling while the LTDR cus-
November 26-29，2015 Changsha，China
Jiangsu Provincial Key Laboratory of Smart Grid
6
Fuchao Liu
State Grid Gansu Power Company
Yongjun Han
State Grid Gansu Power Company
Jianhua Zhang
State Grid Gansu Power Company
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
With the development of economic, China is facing the problem of the shortage of power supply; so it is necessary to implement interruptible load projects. Now when the interruptible load participating in the system peak optimization, the
interruptible load potential is generally considered to be a constant and the acquisition the demand response potential lacks
scientific and theoretical models. A calculation method of power users’ demand response potential is presented in this paper;
cluster analysis is used to divide the users into several patterns
on basis of load data and then the Bayes method is used to
predict the users’ behavior patterns by temperature and day
type, and ultimatelyusers’ demand response potential of prediction days can be known. Anexample is carried out to verify
the feasibility of the method, which can effectively calculate the
demand response potential of power users.
tor is an effective measure to give play to demand response
resources. This presents a new demand of ultra-short term
(15min) load forecast for the aggregator and the affiliated users. Large scale Advanced Metering Infrastructure (AMI) installation introduces huge real time electricity consumption
information which makes it possible to forecast load in a small
spatial and temporary scale. To single user or an aggregator
with small electricity consumption but relatively large fluctuation, this paper firstly proposes a method to choose the historic
similarity day based on fuzzy C-mean clustering. Then wavelet
decomposition is adopted to resolve the similarity day load
curve, low frequency series and high frequency series is modeled and used to forecast by time series method and neutral
network method, respectively. Furthermore, a hierarchical
coordination approach is presented to tune the aggregator load
forecast and the affiliated individual user load forecast to ensure the whole forecast accuracy and feasibility. The forecasting result for a load aggregator with three users shows the
proposed approach is effective and more accurate.
TuA03.5
Comprehensive Evaluation on User Energy Efficiency Based on Improved Matter-Element
Model
pp. 135-140
Huan Liu
Southeast University
Ciwei Gao
Southeast University
TuA03.7
The research and application of Power Integrated Cyber-marketing
pp. 147-151
Fuchao Liu
State Grid Gansu Power Company
Weiwei Lu
Yongjun Han
State Grid Gansu Power Company
Lishi He
Marketing Department HHBS
Jianhua Zhang
State Grid Gansu Power Company
Hongpeng Wang
Marketing Department HHBS
Yue Li
State Grid Jiangsu Electric Power Company
State Grid Jiangsu Electric Power Research Institute
According to the influence factors of energy efficiency digged
from user energy data, this paper establishes a multilevel energy efficiency evaluation system considering equipment and
users on the whole. Objective and subjective weighting method
is adopted to balance the influence of subjective and objective
factors. Matter-element extension model is used to build a hierarchy of energy efficiency indicators to form user’s electric
energy efficiency grades. Analyzing assessment results based
on this model can reflect the energy efficiency level of the user,
and offer users help in energy management and tap the energy
saving potential.
Under the background of today's concept “Internet +”, the
marketing of electric power enterprises develop a new trend
and the reform of power marketing is in urgent need. In order
to adapt to the development of times and meet the needs of
business growth, this paper puts forward the concept of Power
Integrated Cyber-marketing, and further constructs the Power
Integrated Cyber-marketing application model to integrate the
idea of power marketing information collection, processing
and application during the whole process. Finally, an application example is used to make the empirical analysis.
TuA03.6
TuA03.8
Hierarchically Coordinated Ultra-Short Term
Load Forecasting for Load Aggregator
pp. 141-146
Application of the Ward's Method with TABU-Search in the Classification of Load Characteristics
pp. 152-155
Yi Ren
North China Electric Power University
Ming Zhou
North China Electric Power University
Gengyin Li
North China Electric Power University
Zhao Shen
Shenzhen Power Supply Company
Zhiwei Liao
South China University of Technology
Lingshu Zhong
South China University of Technology
Ward's method is an effective method for classification of
power system load characteristics. In view of the limitations of
the traditional Ward's method which can only reduce the
number of clusters through amalgamating, an improved
measure to optimize the cluster result based on TABU search is
put forward along with a statistical method to guide the clus-
The load aggregator is a collector, acting as a hub, to link the
system control center and multiple electricity users, which
integrates multiple end electricity users to participate in the
market competition or the system dispatch. The load aggrega-
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
tering process and test results. In this paper, the daily load
curve is used as the feature vector, while the traditional Ward's
method is used to find a suitable number of clusters. The clustering results are optimized by means of the method of TABU
search. A classification case of the load curves of 744 days in
Guangzhou shows the advantage of those methods.
In order to enhance the frequency response capability of the
power systems, the EV (electric vehicle) clusters and AC (air
conditioner) clusters are used as response resources to maintain the system frequency within an acceptable range. The
frequency control strategies of the EV clusters and AC clusters
are given respectively. A load assessment index is proposed to
evaluate the available response capability of the EV/AC loads
in real time. Then an EV-AC coordination frequency control
strategy is developed. The control sequence of the two controllable loads is determined by their impacts on the comfort level
of EV/AC users. In the case study, a simplified frequency regulation model is used to investigate the effectiveness of the
proposed strategy under two frequency events, the simulation
results show that utilizing the EV/AC loads to stabilize the
system frequency can reduce the frequency deviation to some
extent without serious impact on the comfort level of users.
TuA03.9
Ａn Interactive Operation Strategy for Microgrid
Cooperated with Distribution System Based on
Demand Response
pp. 156-160
Feijin Peng
Foshan Power Supply Bureau
Hongzhi Su
Tianjin University
Peng Li
Tianjin University
Guanyu Song
Tianjin University
Jinli Zhao
Tianjin University
TuA03.11
Effect Evaluation and Compensation Scheme Design of Demand Response Based on Baseline
Parameter Identification
pp. 166-172
Microgrid is an autonomous system which can achieve
self-control, self-protection and self-management. It will not
only comprehensively exploit the advantages of renewable energy sources (RES) in environment protection and energy conservation, but also overcome its intermittency and volatility,
reduce the impact to distribution system when the distributed
energy resources (DERs) are connected to the distribution
network as microgrids. Deployment of microgrids can facilitate efficient demand side management and integration of
RESs at the distribution level. This paper proposed an interactive operation strategy for microgrid cooperated with distribution system based on demand response. In the present paper, a
day-ahead operation optimization model of microgrid on account of electricity purchasing cost, electricity selling benefits,
generation cost of distributed generations (DGs) is proposed.
And then an interaction model in which the microgrid responds to the interaction demand through adjusting the scheduling plan aiming at dealing with the excessive peak load of
distribution system is presented. We analyzed the relationship
between interaction capacity and interaction cost via sensitivity analysis and finally achieved the interaction between the
microgrid and the distribution system. The simulation results
in a microgrid, which has a wind turbine (WT), photovoltaic
(PV) system, energy storage system (ESS) and loads, demonstrate the effectiveness of the proposed method.
Liangjie Zhang
Ciwei Gao
Huan Liu
Gaojie Xu
Dezhi Li
Calculation of baseline load is a prerequisite for the evaluation
of the effect of demand response. This paper summarizes the
commonly used method for calculating the baseline of the demand response, and put forward a new method using the harmony search algorithm to identify the baseline parameters. It
combines the similar date algorithm and intelligent algorithm,
which guarantees the accuracy and speed of calculation. This
paper proposes the time compensation and step compensation
scheme, encouraging users to implement demand response
projects and improving operation economy of power network.
TuA04.1
Modeling of Traveling Wave Protection Functions Based on IEC61850 Standard
pp. 173-177
Ran Xu
Shandong University
Zhaoyong Meng
Shandong University
Ji Ma
The University of New South Wales
Considering the object-oriented modeling design of the IEC
61850 standard, this paper takes the traveling wave protection
as a study case, and proposes the modeling and design method
of traveling wave protection devices. To be specific, the data
objects are clarified first to establish the entire information
models and functional model services. According to IEC 61850,
each of the traveling wave protection functions and the related
functions is viewed as a logical node, and all the traveling wave
protection functions are implemented through the information
interaction between logical nodes. Also, considering the card
pieces design principle, the hardware of a traveling wave protection device is divided into four cards, and each card is with
the corresponding function. Further, ACSI service and device’s
configuration file of GOOSE service are introduced.
TuA03.10
A Coordination Frequency Control Strategy for
Electric Vehicles and Air Conditioners based on
the Load Assessment Index
pp. 161-165
Xudong Wang
Tianjin Electric Power Research Institute
Ling Jiang
Tianjin Electric Power Research Institute
Xianjun Ge
China Electric Power Research Institute
Naishi Chen
China Electric Power Research Institute
Jian Meng
Tianjin University
November 26-29，2015 Changsha，China
Southeast University
Southeast University
Southeast University
China Electric Power Research Institute
China Electric Power Research Institute
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
TuA04.2
TuA04.4
Reactive Power Optimization in Distribution
Network by Using Improved Gravitational Search
Algorithm
pp. 178-182
Simulation of wind power time series based on
the MCMC method
pp. 187-191
Siyuan Wang
Ning Wang
Qiaoqiao Wang
Yi Yang
Guihong Huang
Kuan Zheng
Jinan Power Supply Company State Grid
Jinan Power Supply Company State Grid
Jinan Power Supply Company State Grid
Bazhong Power Supply Company State Grid
Xihua University
Dept. of Energy Strategy and Planning Research
State Grid Energy Research Institute
Jun Liu
Dept. of Energy Strategy and Planning Research
State Grid Energy Research Institute
As it is a new challenge for reactive power optimization reactive power optimization to bring distributed generators (DGs)
into electric distribution network, this paper researches the
reactive power optimization in electric distribution network
including DGs. The randomness of DG output results in the
randomness of the node voltage in the electric distribution
network including DGs, the DG’s incorporation into grid,
therefore, becomes very significant to the uncertainty analysis
of electric power system. Random power flow algorithm is
adopted in this paper to figure out the probability distribution
of each node, and the model, with the objective function of
active network loss minimization based on the chance constraints, is established, under the condition of the secure voltage margin. Improved gravitational search algorithm (IGSA)
is adopted to conduct the simulation analysis in the IEEE-33
node standard test system, and the result indicates that, compared with the routine gravitational search algorithm (GSA),
IGSA can effectively solve the reactive power optimization
problem in electric distributed network, avoiding the premature convergence.
Songxu Xin
Dept. of Energy Strategy and Planning Research
TuA04.3
TuA04.5
Non-mechanism Equivalent Model of W ind
Farm for Transient Stability Analysis
pp. 183-186
Investigation on Fundamental Issues of Dynamic
Equivalent Modeling of W ind Farms
pp. 192-196
Feng Wu
HoHai University
Pupu Chao
Harbin Institute of Technology
YongXiang Chen
HoHai University
Jinling Qi
Harbin Institute of Technology
GuangJing Gong
HoHai University
Weixing Li
Harbin Institute of Technology
Linjun Shi
HoHai University
Xiaoming Jin
State Grid Energy Research Institute
Jinfang Zhang
Dept. of Energy Strategy and Planning Research
State Grid Energy Research Institute
Building an accurate and reasonable time-series model of wind
power is of great significance for the power system operation
and planning. This paper proposes a Markov chain Monte
Carlo (MCMC) method to simulate the time series of the wind
power. Taking into account the nonstationarity and stochastics
of the wind power, this model constructs Markov chain for
time series of the wind power to keep the stochastics and utilize
the Gibbs sampling to realize the probability transition matrix.
A numerical case study with one-year real measurement of the
wind power from one large wind farm in Gansu province of
China is applied to illustrate the validity the proposed model:
the simulated wind-power time series of arbitrary length that
accurately reproduce the statistical behavior of the original
series.
Electrical Power Research Institute
China Southern Grid
To study the transient stability of the power system with large
scale wind farm, the equivalent model is necessary to represent
the aggregated dynamics of the wind farm. Since the mechanical dynamics of the wind turbine is usually decoupled by the
power electronic devices, and the inertia of the generation system can’t be seen from the power grid. A non-mechanism
equivalent modelling method is proposed in this paper. The
transfer function based equivalent model is employed to describe the output dynamics of the wind farm. The parameter
estimation method is also introduced. The proposed equivalent
method is applied on a wind farm consisting 9 wind turbines,
and simulations are performed to test the effectiveness of the
proposed equivalent modeling method.
This paper takes the GE1.5MW DFIG wind turbine as an example, to simulate and analyze the transient response characteristics of the wind turbine under different wind velocities.
Three critical issues related to dynamic equivalent modeling of
wind farms are summarized by intensive investigations. Firstly,
the wind turbines working on low wind speed are found to
consume a large number of active power during the transient
process, and their transient current and active power response
curves sometimes are close to ones working on high wind
speeds. Consequently, the wind turbines working on low wind
speeds cannot be ignored casually for dynamic modeling of
wind farms. Secondly, a counterintuitive phoneme, i.e. more
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November 26-29，2015 Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
clusterings is not necessarily to have higher equivalent accuracy, is found, since the transient current and active power
curves of the wind turbines working on various wind speeds
show significant and nonlinear differences in amplitude, fluctuations and transient response time. Finally, for a large wind
farm with long collector lines and complicated configurations,
the equivalent network impedance, calculated by the equivalent power loss rule, is seen to be able to guarantee the consistency only during the steady-state process instead of the
transient one between the detailed and equivalent models.
Studies about the dynamic characteristics of the collector network impedance should be emphasized.
ence on the results of optimization. To solve this problem, a
robust optimization operation method of power system
risk-control is presented in this paper, considering the
non-probabilistic uncertainty of parameters based on information gap decision theory (IGDT). In the method, loads are
modeled as the non-probabilistic uncertainty parameters, and
the model of robust optimization operation of risk-control is
presented. By solving the model, the maximum fluctuation of
the pre-specified target can be obtained, and the strategy of
this situation can be obtained at the same time. The proposed
model is applied to the IEEE-30 system of risk-control by simulation. The results can provide the valuable information for
operating department to risk management.
TuA04.6
TuA04.8
Study on Fault Characteristics of Jinsu UHVDC
Based on the True-type Device of UHVDC Control and Protection
pp. 197-199
Peng Wei
Jiangsu Electric Power Research Institute
Qian Zhou
Jiangsu Electric Power Research Institute
Jiankun Liu
Jiangsu Electric Power Research Institute
Chenggen Wang
Jiangsu Electric Power Research Institute
The OPF Model and Algorithm for “SourceGrid-Load” Interactive Optimal Regulation Participated with Flexible Load
pp. 205-209
Qi Li
Xueshen Cui
Limin Jiang
Bingqing Guo
Xu Yang
With deep study of UHVDC, pure electromagnetic or electromechanical-electromagnetic hybrid simulation cannot meet the
need of analysis of transient characteristics of UHVDC. In this
paper, take ±800 kV Jinsu UHVDC project as background,
Jiangsu power grid with Jinsu UHVDC accessing was built in
RTDS, true-type device of UHVDC control and protection was
taken. To ensure that the size of the grid while guaranteeing
the DC system transient characteristics of the protection and
control. Take an AC fault occurred in history of direct near
placement as background, the simulation results of using the
true-type simulation systems built and traditionally electromechanical-electromagnetic hybrid system were compared
with the real fault recorder. The results shows the true-type
device of UHVDC control and protection performance remain
highly consistent with actual UHVDC project in protection
functions, behavior and trends of steady-state operating conditions.
Flexible load has increasingly becoming an important means of
regulating the power grid and consuming new energy, as well
as an important part of “source-grid-load” coordination control. On the other hand, nowadays typical new energy resources such as wind and solar energy are being accessed to the
power grid in a large scale, but the phenomenon of abandoning
wind or solar energy is very serious since the effect of channel
bottlenecks or little load consumption. Aiming at solving this
problem, and combining with the possibility of adjusting load
flexibly because of the loose electricity price in the new situation of Chinese electric power reform, this paper gives the DC
OPF model for the "source-grid-load" interactive optimal regulation based on the traditional OPF model. To be precise, this
model puts forward the goal of maximizing the system-wide
social net marginal benefit, which is on the basic of any time
section with balanced power flow in the system, and considers
the marginal cost of the source and network side as well as the
net marginal benefit of the load side, to research the optimization operation strategy of the large-scale new energy, conventional power and flexible load. Then linear program algorithm
is deduced based on basic mathematics model foundation. The
example is simulated under the goal of maximizing the social
net marginal benefit with MATLAB/linprog, the results show
the effectiveness of the model and algorithm. There is no convergence problems in the model and algorithm presented in
this paper. In addition, the compute speed is fast. On the one
hand, the scheduling decision can meet the security, economy,
reliability and other operational requirements of the power
system. On the other hand, the regulation value of the
“source-grid-load” interaction which participated with flexible
load can be fully reflected. In a word, this paper provides new
ideas of OPF for future "relatively independent" power dispatching / trading platform.
TuA04.7
Robust Optimization of Risk for Power System
Based on Information Gap Decision Theory
pp. 200-204
Xue Li
Zhenchen He
Shaohua Zhang
Shanghai University
Shanghai University
Shanghai University
Risk-control optimization has great significance for security of
power system. Usually the probabilistic uncertainties of parameters are considered in the research of risk optimization of
power system. However, the method of probabilistic uncertainty description will be insufficient in the case of lack of
sample data. Thus non-probabilistic uncertainties of parameters should be considered, and will impose a significant influ-
November 26-29，2015 Changsha，China
North China Electric Power University
North China Electric Power University
China Electric Power Research Institute
China Electric Power Research Institute
Beijing HUASHANG Energy Management
Limited Company
10
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
head lines as equality constraint and temperature as an state
variable in optimal power flow which maximizes the VSM index. The proposed approach is capable of improving evaluation accuracy and the evaluation results of consider and disregard HBR of transmission line are compared via simulation.
TuA04.9
Power System Electromagnetic Transient and
Electromechanical Transient Hybrid Simulation
based on PSCAD
pp. 210-215
Xiaowen Han
Haibo Zhang
TuA04.11
North China Electric Power University
North China Electric Power University
A Novel Congestion Management Method in
High-voltage Distribution Network Based on
Logic Constrains of Functional Units
pp. 220-225
Due to the expanding scale of power system and the access of
HVDC and FACTS devices, independent electromagnetic transient simulation and electromechanical transient simulation
begin to show their limitations. However, the electromagnetic-electromechanical transient hybrid simulation can expand
the simulation scale, and improve the simulation speed and
accuracy, which has important theoretical value and practical
engineering significance. In this paper, the electromechanical
transient simulation program is completed by C programming
language, and the electromechanical transient user-defined
module is developed in PSCAD. The function calling of electromechanical transient simulation program by EMTDC is
realized through interface program that is developed based on
Fortran programming language. This paper expounded the
interface equivalent circuits of electromagnetic and electromechanical side, and built a hybrid simulation system through
connecting electromagnetic transient subsystem and the user-defined module of electromechanical side. Through the
comparison between the simulation results of the proposed
hybrid simulation and pure electromagnetic model, the correctness of hybrid simulation method based on PSCAD is verified.
Yong Jin
Junyong Liu
Sichuan University
Sichuan University
Load transfer is an important method for congestion management in high-voltage distribution network. Functional units
were proposed to express the topological structure of
high-voltage distribution network (HVDN) in this paper. In
addition, three types of logic constraints of functional units
including sequence, mutual exclusion and orientation were
established to facilitate minimal transfer, load curtailment and
balancing with variables of transfer units instead of traditional
switch status. The proposed model was verified using the practical HVDN of an urban power system in China. Simulation
result shows that the proposed models can be efficiently solved
by commercial software.
TuA04.12
Research on Modeling and Simulation of Communication in Power SCADA System
pp. 226-230
TuA04.10
Aijun Hou
Chunchao Hu
Kai Ma
Zexiang Cai
Chengqiao Huang
Tianliang Pan
An OPF Based Approach for Static Voltage Stability Evaluation Considering Heat Balance Rule
of Overhead Line
pp. 216-219
Youmin Li
Shandong Electric Power Maintenance Company
Jing Xiao
Shandong Electric Power Maintenance Company
Ronghua Yang
Shandong Electric Power Maintenance Company
Yingchun Feng
Shandong Electric Power Maintenance Company
Qiang Zhang
Shandong Electric Power Dispatching and
Control Center
Mengxia Wang
Shandong University
Guangdong Power Grid co., LTD
Guangdong Power Grid co., LTD
Guangdong Power Grid co., LTD
South China University of Technology
South China University of Technology
South China University of Technology
In order to solve the problem of analyzing network performance of SCADA system communication of power grid in effective and practical way, this paper proposes a method based
on OPNET Modeler, in which communication object models of
SCADA system and variety simulation scenes are built properly. According to the actual situation of SCADA system communication, the paper analyzes the modeling demand of communication network, services information flow, communication
protocol and studies the modeling method of the system. The
networks for simulation were established and the networks
performance was analyzed under variety simulation scenes.
The paper provides an effective tool and useful material for
accident drills, equipment selection and network planning of
SCADA system communication.
In this paper, overhead lines' heat balance rule (HBR) is integrated into static voltage stability evaluation and an optimal
power flow (OPF) based approach for voltage stability margin
(VSM) evaluation is proposed. It captures the coupling nature
between current & temperature of overhead line and also considers the influence of temperature on series resistance of conductor by introducing heat balance equation (HBE) of over-
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Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
sign of coordinated control system of ultra-supercritical
coal-fired (USC) power unit. This may serve as a reference for
engineering analysis and simulator development of ultra-supercritical power units.
TuA04.13
Arc Grounding Overvoltage Suppression Strategy
by Using ZnO Nonliear Resistance Grounding
Mode
pp. 231-235
Wangjing Tan
Qian Wang
Jiandong Duan
Zan Ye
Shuaishuai Cui
TuA04.15
Xi’an University of Technology
Xi’an University of Technology
Xi’an University of Technology
Xi’an University of Technology
Xi’an University of Technology
Using the STATCOM with Energy Storage to Enhance the Stability of AC-DC Hybrid System
pp. 242-247
Xu Zheng
Wuhan University
Jianyong Ding
Wuhan University
huang Zhao Huazhong University of Science and Technology
Mei Li
Huazhong University of Science and Technology
Ni Zeng
Huazhong University of Science and Technology
Ruoxi Zhu
Huazhong University of Science and Technology
Buhan Zhang Huazhong University of Science and Technology
With the development of power capacity, the arc grounding
overvoltage has become increasingly prominent. Consider system capacity, the operation mode and so on, a new method to
determine the current-voltage (V-I) characteristics of ZnO
nonlinear resistance on the new grounding mode is put forward by analyzing the power system through symmetrical
component method. Then the V-I characteristics of ZnO nonlinear resistance is obtained through the segmental linearization method. Finally, by using discrete wavelet, the multi-resolution analysis on zero sequence current is performed.
According to the high frequency component energy ratio
within the time window, the protection strategy based on ZnO
nonlinear resistance is put forward. Results indicate that the
designed ZnO nonlinear resistance parameters can suppress
arc grounding overvoltage, and the proposed grounding mode
is safe and reliable.
UHVDC has been rapidly developed for its large conveying
capacity, small net loss and easy power control, which can
solve the problem of the uneven distribution of load and energy with great economy. However, with DC transmission access,
the power system must have a strong ability of reactive power
support to cope with the possibility of transient voltage problem. At the same time, regional power oscillation issue also
can’t be ignored. Considering that the STATCOM, as a new
type of the device, can only provide dynamic reactive power to
support the system voltage and cannot undertake active regulation and control to damp system power oscillation problem,
the STATCOM with energy storage is presented in this paper
to solve both problem of transient voltage and power oscillation in AC/DC hybrid system. In view of the central China
province power grid planning, possible serious faults of the
system were analyzed. The simulation results show that the
STATCOM with energy storage can not only effectively support the system transient voltage and promote voltage of DC
inverter station to avoid DC block caused by commutation
failure, but also significantly enhance the system damping and
restrain the power oscillation of UHVAC lines in the case of
system failure.
TuA04.14
Improvement of a Non-linear Model of Ultra-supercritical Boiler-turbine Unit and Its Application
pp. 236-241
Yanna Xi
Yinsong Wang
North China Electric Power University
North China Electric Power University
The characteristic of supercritical unit is not easily controlled,
because the research on the coordinated control system of ultra-supercritical coal-fired (USC) power unit is usually based
on a kind of mathematical model, which is used to test the correctness of the design concept and the effectiveness of the control strategy. If the mathematical model cannot reflect the intrinsic nature of the controlled object, the simulation results
are difficult to explain that the control strategy designed is
successful. In this paper, a simplified non-linear model which is
suitable for the controller design in coordinated control system
of a once-through boiler-turbine unit is analyzed at first. Then
based on the study of the above model, features and improvement suggestions of the non-linear model are proposed. At last,
step forced simulation test and comparison test with operation
data were done to test the effectiveness and accuracies of the
simplified non-linear once-through boiler model. Simulation
results show that this model has same dynamic characteristics
with the actual unit and can predict output changes with certain accuracy which means that it is fit for the controller de-
November 26-29，2015 Changsha，China
TuA04.16
Reliability Modeling of W ind Farms Considering
Weather Conditions
pp. 248-254
Fan Chen
Zhinong Wei
Haitao Liu
Jun Li
Xiaolian Zhang
College of Energy and Electrical Engineering
College of Energy and Electrical Engineering
School of Electric Power Engineering
School of Electric Power Engineering
School of Electric Power Engineering
Wind speed correlation, time variation of wind turbine generator’s forced outage rate (WTG FOR), and dependent failure
of WTGs in adverse weather are three factors that affect reliability evaluation of wind integrated power systems. These three
factors are related to weather conditions, which can be divided
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
into normal and adverse weather conditions. Although wind
speed correlation has been well studied by researchers, the
other two factors are not addressed in the existing reliability
models of wind farms. A new enhanced reliability model of
wind farms is proposed in this paper to effectively incorporate
all of these factors. In the proposed model, WTGs are assumed
to fail dependently in adverse weather, but independently in
normal weather and the dependency of WTG FOR value on
weather conditions is considered. Nataf transformation method
(NTM) is chosen to simulate correlated random variables for
correlated weather conditions, correlated wind speeds, and
WTG dependent outages. In order to demonstrate the effectiveness of the proposed model, a series of studies have been
carried out on the IEEE RTS with two wind farms added. The
results validate the effectiveness of the proposed wind farm
model.
of the calculation as well. However, this paper shows that there
are characteristics in common with all FACTS controlled by
voltage source converters (VSCs). In power flow calculation,
each VSC converter can be equivalent to a contr-ollable voltage source in series with transformer impedance, and thus the
power flow model of each kind of VSC FACTS devices can be
described by the equations of all the equivalent branches accompanied with the topology of those branches. Based on
Newton-Raphson (NR) algorithm theory, a general algorithm
framework designed for new power flow calculation considering of multiple types of VSC FACTS has been presented. An
open source power system simulation package named InterPSS
is extended to realize the generality of the power flow calculation, and automatic differential (AD) technology is utilized to
develop a function module to automatically generate the Jacobian matrix so as to avoid manual deduction. The calculation
of power flow with VSC FACTS is tested in several IEEE sample systems to validate the correctness and efficiency of the
method proposed in this paper.
TuA04.17
Comparison of Simulation Methods of Spatially
Correlated W ind Speeds
pp. 255-261
Fan Chen
Haitao Liu
Jun Li
Xiaolian Zhang
TuA04.19
Simulation and Modeling of Blended Constant-frequency and Variable-frequency
Air-conditioner
pp. 269-273
Nanjing Institute of Technology
Nanjing Institute of Technology
Nanjing Institute of Technology
Nanjing Institute of Technology
Rongling Zhou
Zhengli Zhang
Xiaobo Liu
Ping Ju
Chuan Qin
Qian Chen
With the rapid development of wind power generation technologies, increasing wind power has been integrated into power systems. In order to study the impact of wind power uncertainties on power systems, efficient wind speed modeling and
simulation methods are demanded. In this paper, the stochastic
characteristics and spatially correlation of wind speeds of wind
sites are presented. Then, three common wind speed simulation
methods to generate spatially correlated wind speeds are compared, including Cholesky decomposition, Nataf transformation and Copula method. Further, the historical wind
speeds of two wind sites in Netherland are used, and the performances of the three simulation methods are analyzed by
some numerical tests. This paper provides guidance for the
choosing of wind speed simulation methods in power system
analysis.
The conventional constant frequency airconditione-r (CFAC)
and the inverter based variable-frequency air-conditioner
(VFAC) are increasingly used now. The study of
air-conditioner based load and its impact on power system is
greatly demanded. In this paper, the characteristics of CFAC
and VFAC are investigated, respectively. Then, a modeling
method of blend-ed air-conditioner (BAC) load is proposed,
and parameters of CFAC and VFAC are studied in detail. Later, the proposed model is tested in real power system. It is
found that the characteristics of blended air-conditioner model
is strongly related to the composition proportion of CFAC and
VFAC, and they apparently affect power grids especially on
voltage/reactive power issues.
TuA04.18
A General Power Flow Calculation Method for
Power Systems with VSC FACTS Based on InterPSS and Automatic Differentiation
pp. 262-268
Zibin Yu
Zhigang Wu
Zijian Huang
Suyun Wang
Hohai University
Hohai University
Hohai University
Hohai University
Hohai University
Hohai University
TuA04.20
Solution of Probabilistic Load Flow in Power
System Based on Non-intrusive Arbitrary
Polynomial Chaos Theory
pp. 274-279
South China University of Technology
South China University of Technology
South China University of Technology
South China University of Technology
Xue Li
Haitao Wang
Shaohua Zhang
This paper presents a general approach to solve the power flow
with multiple kinds of VSC FACTS installed in the same power
system. Traditional power flow model should be different for
each type of VSC FACTS, which will increase the complexity
Shanghai University
Shanghai University
Shanghai University
Non-intrusive arbitrary polynomial chaos theory (NIAPC) can
overcome the defects of traditional methods which need abun-
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Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
dant simulations and time. Meanwhile, NIAPC can deal with
probabilistic load flow analysis with arbitrary distributed uncertainties precisely with a small quantity of simulations. The
paper presents the probabilistic load flow based on
non-intrusive arbitrary polynomial. Firstly, the probabilistic
collocation points are chosen. Then, Hermite polynomial is
solved , and the uncertain problems whose parameters obey to
experienced probability distribution are solved. Finally, the
paper simulated the process of probabilistic load flow (PLF) on
the platform of Matlab. The results were compared between
NIAPC and Monte Carlo (MC). Results indicate that the PLF
calculation based on NIAPC is not only able to achieve a high
accuracy compared to the MC, but also it does own high potential to relief the computation burden of traditional PLF
calculation drastically.
Yue Xia
TuA04.21
TuA04.23
A Probabilistic Equivalent Method of DFIGbased W ind Farm Based on Offline Calculations
and Online Match
pp. 280-284
Influence on Transmission Line Relay Protection
under DFIG-based wind farm intergration
pp. 290-295
Haiqiang Zhou
Kanghui Gu
Jingdong Han
A dq0-domain synchronous machine model that is aimed at
accurate and efficient simulation of electromagnetic and electromechanical transients in power electric networks is developed. The electromagnetic part of the machine model is derived firstly in the dq0 reference frame. Then, imaginary parts
for the dq quantities are constructed to ensure the compatibility with external multi-scale network model. Finally, a multiscale companion model of synchronous machine is established to simulate diverse transients. The first benchmark case
for subsynchronous resonance studies is studied, and a comparison of the results with those obtained from EMTP-type
simulator verifies the accuracy and efficiency of the proposed
machine model.
Gao Feng
Guan Zhe
Zhang Shuang
Zhang Jun
Dou Jingming
Hohai University
Hohai University
Hohai University
The equivalent model of wind farm was changing when randomness and intermittent were taken into consideration. A
probabilistic equivalent method of the DFIG-based wind farm
is proposed in this paper. It was based on offline calculations
and online match. Firstly, the equivalent method of the wind
farm was discussed. It was assumed that the equivalent model
consists of three type of equivalent DFIG. The structure of the
equivalent model keeps unvaried whereas the parameters keep
changing with the drifting of scenarios. The historical recorded
scenarios are analyzed to get samples of the equivalent model.
The representative samples are extracted through statistics
and combinations with the three kind of typical equivalent
DFIGs. The probability distribution function of each representative sample was also got by investigation. Then, a BP
neural network with two hidden layers and six inputs was used
in the wind power prediction. It was used in online match. The
output of next moment was used in calculating to which degree
the scenarios in the sample set match with the next scenario.
The matching degrees were sorted and the most matched scenarios were chosen. Finally, this method was applied in the
augmented IEEE 3-generator and 9 bus test system with wind
farm connected in. It was shown that the wind farm equivalent
model can be predicted and its probability is also given. It can
reduce computation tasks effectively and solve the difficulty of
wind farm equivalent when working conditions are changing.
TuA04.24
Research on the interface algorithm of power
system electromechanical-electromagnetic hybrid simulation
pp. 296-300
DQ-domain Modeling for Multi-scale Transients
in a Synchronous Machine
pp. 285-289
Hui Zhang
Ran Li
Yunting Song
Wenzhuo Liu
Chinese Academy of Sciences
Chinese Academy of Sciences
November 26-29，2015 Changsha，China
Xi’an Jiaotong University
Xi’an Jiaotong University
Xi’an Jiaotong University
Xi’an Jiaotong University
Xi’an Jiaotong University
In conventional wind farm outgoing line protections, the fault
characteristics of wind farms have been rarely considered and
thus the protections may mal-operate or refusal-operation due
to the integration of large-scale wind power. This paper analyzes fault characteristics of the outgoing transmission line
from a DFIG-based wind farm with LVRT capability and indicates that the main frequency component of the wind farm
side short-circuit current varies with the speed of wind turbine
generators, while the main frequency component of the wind
farm side bus voltage still maintains the power frequency during a non-bolted-three-phase fault in the outgoing transmission
line. Performances of directional protection based on the positive sequence voltage and current power frequency ,the distance element using the power frequency voltage current ratio
to measure fault distance, and the fault-type element which
uses the sequence current or phase current differential mutation quantity are affected severely, while zero sequence current
protection is affected to some degrees. Performances of those
two algorithms are analyzed and compared on the
PSCAD/EMTDC platform.
TuA04.22
Hua Ye
Yanan Tang
Technische Universit¨at Berlin
North China Electric Power University
North China Electric Power University
China Electric Power Research Institute
China Electric Power Research Institute
With the increase of the number and capacity of HVDC, the
14
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
influence of HVDC system on AC power network is more and
more complex. Electromechanical transient simulation and
electromagnetic transient simulation cannot meet the requirements of HVDC system study in large power grid. Therefore,
research on power system electromechanical-electromagne-tic
hybrid simulation has very important significance. In this paper, we improve the algorithm of the interface based on the
PSD-PSModel hybrid simulation. The optimization curve fitting algorithm based on FFT is proposed to improve the accuracy of the algorithm. The test method of interface algorithm is
proposed, and the practical conclusion of PSD-PSModel interface is obtained.
tween paralleled lines. In order to analyze the reason of unbalanced current in a 220kV short line in Jiangxi Grid, the
paper made equivalent grid network using PSASP and modeled the double-circuit transmission line by EMTP. Then unbalanced currents of different working conditions were simulated by EMTP. The results revealed that the adjustments of
bundle spacing of each conductor, the reduction of the
three-phase load imbalance, the rational arrangements of
phase sequence and the reasonable choices of operation mode
could constrain the unbalance current effectively.
TuA04.27
TuA04.25
Fault Transient Simulation Analysis for HVDC
Transmission Lines
pp. 312-317
Modeling of Electric Vehicle Loads Applicable to
Power System Quasi-Steady State Analysis
pp. 301-305
Yingle Fan
Hengxu Zhang
Fang Shi
Luhua Xing
Dong Yang
Dandan Zhang
Wenbo Li
Qing Chen
Shandong University
Shandong University
Shandong University
Fault transient analysis plays an important role in protection
and fault location research for high voltage direct current
(HVDC) transmission lines. Fault transient simulation methods and analysis for HVDC transmission lines are detailed
presented in this paper, to avoid repetitive tasks and waste of
research efforts. Influences of the control system, operation
modes and direct current (DC) filter links on the fault transient simulation analysis for HVDC transmission lines are discussed. Transient characteristics of voltages and currents on
HVDC transmission lines for faults on HVDC transmission
lines, lightning strokes and commutation failures are analyzed,
and corresponding simulation methods are also given.
Electric vehicles (EVs) are new power loads of power systems.
It is important to model the charging process of EVs in power
system numerical simulation. This paper proposes a methodology for modeling of EV loads applicable to power flow calculation and other quasi-steady state analysis. The numerical
methodology of EV load modeling is expounded from the DC
and the AC side of charging EVs. In the DC side, the constant
current and the constant voltage charging processes are considered. In the AC side, the changes of the charging efficiency
and power factor versus the AC frequency and voltage are
analyzed. Based on the current EV market status and the development trends, four types of EV load models are calculated
using this methodology. The EV load modeling methodology
considers EV quantities, initial state-of-charge distributions,
load change processes during charging and the effect of grid
side parameters.
TuA04.28
The Simulation of the Static Frequency Converter in Pumped Storage Power Plant
pp. 318-323
TuA04.26
Tao Zheng
Xue Jiang
Shuo Yu
Analysis of Unbalanced Current in a 220kV Short
double-circuit Line
pp. 306-311
Jiangyuan Zhou
Dahai You
Shuilin Lu
Zhan Shu
Shandong Electric Power Research Institute
Shandong Electric Power Research Institute
Shandong Electric Power Research Institute
Shandong Electric Power Research Institute
Shandong University
North China Electric Power University
North China Electric Power University
North China Electric Power University
In the field of modern network, the static frequency converter
start–up of the pumped storage unit is one of the important
issues of research. The paper has analyzed and studied on the
intermittent commutation stage, the natural commutation
stage and the convergence problem of the two stages. Based on
the principle of static frequency converter start-up, in the natural commutation, the control method of the inverter has been
simplified according to the rotor position. Combined with some
engineering practices, it has proposed the improved control
strategy that the double-loop control could be inputted directly
when the motor starts. Finally, the Matlab/Simulink has been
used to build control model to verify the correctness of the
improved method proposed in the paper.
Huazhong University of Science and
Technology
Huazhong University of Science and
Technology
Huazhong University of Science and
Technology
Jiangxi Electric Power Research Institute
With the growing electricity demands of the grid, more and
more new power plants and substations have been connected to
long transmission line through short lines, which results in
current imbalance since that short lines are generally erected
without transpositions and the inherent parameter asymmetry
of them leads to the unbalanced electromagnetic coupling be-
15
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
TuA04.31
TuA04.29
Deepen Research on Electric Load Modelling
pp. 334-339
A General Test Scheme for Electrical Measurement and Control Unit and Its Application
pp. 324-328
Fei Wang
Kui Wang
Rui Wang
Yuanyuan Geng
Jing Xiao
Wang Qi
Yi Jun
Zhao Bing
Liu Liping
Tang Yong
Ministry of Education Shandong University
Ministry of Education Shandong University
Ministry of Education Shandong University
Ministry of Education Shandong University
State Grid Shandong Electric Power Company
Maintenance Company
Detailed procedures for the modelling of synthesis load of
practical power network are presented; then based on the detailed investigation and statistics of load composition at 220 kV
and 330 kV substations, the distribution of different kinds of
load in domestic power grids are analyzed and the necessity of
establishing the parameters of synthesis load model (SLM)
suitable to actual power networks is pointed out; finally, the
influence of SLM parameters on stability of interconnected
power grids is researched. Research results show that it is crucially important for accurate analysis on power grid stability to
choose appropriate load model and parameters.
To improve the generality and flexibility of test scheme, a general digital and analog mixed test scheme, which is based on a
computerized model and signal generator has been designed in
this paper, the test scheme applies simulation software to produce any kind of digital test signal, which is then transferred to
analog signal by signal generator to meet input requirements
of the device under test. The measurement value of device under test can be compared with original input value to analyze
the measurement precision under all conditions. A test example
for PMU Light is given to describe the test process, and the test
result shows that the test scheme proposed in this paper can
produce any kinds of test signals, it is a general and flexible
test means for electrical measurement and control unit with
high accuracy.
TuA04.32
AVC Testing Platform Design and Implementation for the Regional Power Grid Based on Advanced Digital Power System Simulator
pp. 340-345
Yonghong Tang
TuA04.30
Lin Xu
Consistency Analysis of DFIG W ind Generation
Models in PSS/E and PSASP
pp. 329-333
Zhenchao Jiang
Junyong Liu
Xiaodong Shen
Lixiong Xu
Xiaoyan Sun
Tao Fu
Shandong University
Hengxu Zhang
Shandong University
Changgang Li
Shandong University
Qingwen Xu
Shandong University of Technology
Xiaoming Liu
State Grid Shandong Electric Power Company
Ji Zhang
State Grid Shandong Electric Power Company
Chao Qi
State Grid Shandong Electric Power Company
State Grid Sichuan Electric Power Research Institute
State Grid Sichuan Electric Power
Research Institute
State Grid Sichuan Electric Power Research Institute
Sichuan University
Sichuan University
Sichuan University
Sichuan University
The automatic voltage control (AVC) system provides real-time
automatic control for the on-load transformer tap changer
(OLTC) and capacitor/inductor banks, which is widely used
for power system voltage monitoring and control in the regional grid. An advanced digital power system simulator
(ADPSS)-based testing platform of the AVC controller is designed in this paper. The circuit model of the regional power
grid is established, as well as the OLTC and the reactive power
compensation devices. The data conversion interface is utilized
for bidirectional data exchange from the remote meter and
control signals between the ADPSS and the AVC system. The
principle of the AVC voltage regulation and the ADPSS-based
AVC testing platform are also introduced, followed by the data
flow process of the OLTC and capacitor/inductor banks, which
formulates the foundation for closed-loop testing of the AVC
control system. To evaluate its rationality and availability, especially the effect of voltage regulation and control, an index
system is established. Furthermore, functional modules of the
assessment system and their implementation are presented.
With rapid increase of wind power installed capacity, the operation mode of power system has changed greatly, it is necessary to include modeling and simulation based on wind turbines and farms. Numerical simulation plays a unique role in
power system operation and control, and its accuracy turns out
to be the focus of electric industry. PSASP and PSS/E, as two
main sorts of simulation analysis software at home and abroad
respectively, both enable wind turbines electromechanical
transient simulation. In this paper, Detailed comparisons are
made between Doubly-fed induction generator (DFIG) in
PSS/E and PSASP. Finally，simulative results of power system
including the models are compared and analyzed.
November 26-29，2015 Changsha，China
China Electric Power Research Institute
China Electric Power Research Institute
China Electric Power Research Institute
China Electric Power Research Institute
China Electric Power Research Institute
16
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Test results show that all the modules in the assessment system
possess good operational robustness and can perform automatic voltage control well on continually varying real-time
simulated data of regional grid.
TuA04.35
Arc Grounding Model and Simulation in
Non-effectively Grounded System
pp. 358-362
TuA04.33
Fei Wang
Houlei Gao
Yong Sun
Research on the User-Defined Modeling of HVDC
Converter F iring Control Based on
ADPSS/ETSDAC
pp. 346-351
Linli Zhang
Arc grounding faults appears in distribution system quite frequently. But the study of simulation model of the arc grounding is quite little. This paper mainly focused on the analysis of
arc grounding process and proposed a new method theoretically to judge when and whether the arc should be off or renewed. There are two successive processes in zero off period of
the arc: thermal breakdown process and electrical breakdown
process. A method was proposed that use Mayr and Cassie
model to simulate this two progress. And a simulation of arc
model was built using the transient simulation tool PSCAD.
After that, the simulation results are compared with theoretical
analysis to verify the correctness of the model. In the end, this
model was used to analyze the role of the Petersen coil in reducing the over-voltage caused by arc grounding fault.
Kun Chen State Grid Hubei Electric Power Research Institute
Bo Wen
State Grid Hubei Electric Power Research Institute
Xujiang Chen
China Electric Power Research Institute
Shiyun Zhang
HUST
Xianggen Yin
HUST
This paper has carried out a research on the user-defined
modeling of the trigger control module of HVDC converter
based on ADPSS/ETSDAC simulation platform is carried out
in this paper. A detailed digital simulation model is also constructed. Firstly, an electromagnetic transient simulation model of the HVDC primary system is put up on the
ADPSS/ETSDAC simulation platform. On this basis, user-defined method is applied to build simulation models of the
module centered on the converter firing control, as well as its
surrounding independent functional modules. The key function
modules of the simulation model are analyzed in detail and the
response curves are given. Finally, taking Longquan-Zhengping HVDC project as an example, this paper has
compared and analyzed the DC line voltage and current waveforms obtained from the user-defined model and the actual
HVDC project when instantaneous grounding faults occur on
the DC line to show the validity and effectiveness of the user-defined model.
TuA04.36
Comprehensive Evaluation of Smart Grid Technology based on TRLs
pp. 363-368
Lin Liu
Han Huang
Wenjin Qi
Qiming Zhao
Xiaojun Li
Hongjie Jia
Yuan Zeng
Yanli Liu
TuA04.34
Generalized Load Modeling Based on the Improved Artificial Bee Colony Algorithm
pp. 352-357
Jiangwen Yi
Jianquan Zhu
Shandong University
Shandong University
State Grid Shandong Electric Power Research Institute
State Grid Shandong Electric Power Research Institute
State Grid Energy Research Institute
State Grid Energy Research Institute
Tianjin University
Tianjin University
Tianjin University
Tianjin University
Tianjin University
Tianjin University
The application of advanced technologies is one of the key differences between smart grid and traditional grid. Its development and application will be through various periods and field
of the construction of smart grid. This paper establishes a
comprehensive evaluation index system for smart grid technology. The whole index system has the general characteristics,
which can evaluate the technology itself from three aspects
including technology performance, economy value, and social
& environmental impact. Technical performance is evaluated
by dividing hierarchy, while economic value and social & environmental impact are evaluated by the use of traditional
hierarchical type index system. Two kinds of evaluation approaches in this paper have been effectively combined. Meanwhile considering some indexes may exist uncertainty when
they are collected, probability theory is applied to analysis the
uncertainty of the final result. The case result shows that the
proposed method can provide reference comments for the continued development of the technology.
South China University of Technology
South China University of Technology
On the basis of a large number of documents, an improved
artificial bee colony (ABC) algorithm is proposed, and then is
applied in the generalized electrical load modeling in this paper.
Firstly, an update replacement strategy of the worst nectars is
presented by integrating the main principle of shuffled
frog-leaping algorithm (SFLA) and ABC algorithm. In this
way, the overall fitness of bee colonies is improved effectively,
providing better optimizing performance as a result. Secondly,
the structure of the generalized load model is given according
to the impact of the distributed power to the load characteristic. The key problems such as the dynamic and static ratios, the
difference between the rated and system capacities, and the
initialization of motor are also analyzed in detail. Finally, the
improved ABC is implied to the parameter identification of
general.
17
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
hidden failures of line protection. First the evolvement of cascading failures is investigated which reveals that power flow
transferring and hidden failures of line protection are significant for cascading failures. Then this paper uses event tree
approach to analyze the process of cascading failures with
multiple hidden failures of line protection and the probability
of each failure sequence during the cascading process is calculated by Bayesian network. Finally, the simulation case on
IEEE 30-bus shows the validity of the proposed method.
TuA04.37
Frequency Spectrum Characteristic Analysis of
Single-Phase Ground Fault in a Petersen-coil
Grounded System
pp. 369-374
Shuai Zhang
Houlei Gao
Mengqian Hou
Yong Sun
Zhimin Shao
Jianxiu Li
Shandong University
Shandong University
Shandong University
State Grid Shandong Electric Power
Research Institute
State Grid Shandong Electric Power
Research Institute
State Grid Shandong Electric Power
Research Institute
TuA04.39
On Static Load Model of Variable Frequency
based Motor Drive
pp. 380-385
Fangzhao Yu
Qian Chen
Xiaoyi Che
Ping Ju
Chuan Qin
Yuqing Jin
Hongyu Li
This paper theoretically analyzes the frequency spectrum
characteristics of the single-phase ground fault in a Petersen-coil grounded distribution network. Different equivalent circuits are analyzed for faults with low transition resistances and with high transition resistances, separately. The
analysis concludes that the system makes a transition from an
underdamped state to a damping state, and finally to another
underdamped state with the increase of transition resistances.
A distribution network model is built with PSCAD/EMTDC.
Simulations are performed for different fault locations, different fault initial angles, different transition resistances and different cable proportions. The analysis in time domain and frequency domain is performed. Results show that the use of cables enables the main frequency of the fault current move towards lower frequency. Meanwhile, the amplitude of the fault
current obviously increases due to the high capacitance to
ground of cables. The transition resistance makes the biggest
influence on the characteristic frequency band. Fault location
mainly affects the zero sequence current main frequency amplitude. The further the fault location is away from the Bus,
the little the amplitude of high-frequency component is. The
transient capacitive current component increases, the transient
inductive current component decreases and the high-frequency
component amplitude increases with the increase of fault initial angles.
Power electronics based energy-saving technology has being
developed rapidly in recent years. It is an inevitable trend for
traditional load devices to be upgraded with power electronics
technology. For example, more and more motor drives, which
occupies a large proportion in total power load, change from
asynchronous motors to Variable Frequency (VF) motor drives.
Thus, the actual features of electrical loads, which plays an
important role in power system analysis, will have obvious
difference than that of before. Firstly, the operation theory of
VF motor drive is studied in this paper, and its detailed model
is also established in simulation software. Then, the curves of
dynamic response curves under the disturbances of voltage
and frequency in power grid are obtained. Finally the parameters of the static model of VF motor drive are identified.
TuA04.40
A Study on HVDC User-Defined Modeling in
PSS/E
pp. 386-391
TuA04.38
Study on Risk Assessment of Cascading Failures
with Event Tree Approach and Bayesian Network
pp. 375-379
Lin Zhu
Ping Liu
Lei Feng
Yingguo Yang
Feng Qian
Rui Chen
Donghui Zhang
Xiaoming Jin
Baorong Zhou
Hailin Su
Yuchuan Chen
Lin Zhu
South China University of Technology
South China University of Technology
South China University of Technology
Guangdong Power Grid Power Dispatching Control Centre
Guangdong Power Grid Power Dispatching Control Centre
Guangdong Power Grid Power Dispatching Control Centre
Electric Power Research Institute, CSG
Electric Power Research Institute, CSG
Electric Power Research Institute, CSG
South China University of Technology
South China University of Technology
South China University of Technology
Power System Simulator for Engineering (PSS/E) is one of the
most extensively used power system simulation software in the
globe. In this paper, by modeling a high-voltage direct-current
(HVDC) transmission system, an in-depth study of its user-defined function in PSS/E is illustrated. Furthermore, comparing the simulation curves of user-defined HVDC in PSS/E
with those simulated by PSCAD/EMTDC and PSD-BPA, the
This paper proposes a new method to evaluate the operational
risk of cascading failure in power systems considering multiple
November 26-29，2015 Changsha，China
Hohai University
Hohai University
Chengdu Engineering Corporation Limited
Hohai University
Hohai University
Hohai University
Hohai University
18
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
correctness of the HVDC user-defined model, the feasibility as
well as the practicability of PSS/E’s user-defined function are
validated. Similarly, the modeling method proposed in this
paper provides guidance for modeling of other complex
two-terminal and multiport components applied to power systems. The experimental results prove the accuracy of the
HVDC user-defined model as well as the practicability of the
method, by which the feasibility of two-terminal component
modeling in PSS/E is also verified.
and efficiently solved to global optimality by using the available commercial software. Finally, case studies on IEEE 33-node
test feeder are conducted and the results demonstrate the validity as well as effectiveness of the proposed model.
TuA04.43
A Real-time Transient Simulator of Grid- connected Photovoltaic/Battery System Based on
FPGA
pp. 402-406
TuA04.41
Zhiwen Xie
High-precision W ind Power Generation Model
based on Actual W ind Farm
pp. 392-396
Zhiying Wang
Peng Li
Chengdi Ding
Zhengjun Bi
Electric Power Research Inst.
State Grid Jilin Electric Power Company Limited
Changzheng Gao
Electric Power Research Inst.
State Grid Jilin Electric Power Company Limited
A grid-connected photovoltaic (PV)/battery simulation system
based on FPGA (Field Programmable Gate Array) is designed
in real-time in this paper. It provides a simulation platform for
hardware-in-loop test of physical devices. The simulation
framework is designed and functional modules are introduced.
The modeling of PV and battery is realized in a single FPGA
chip. A typical PV/battery system is simulated in real time. The
time step for electrical and control system is 1.096μs and
1.696μs. The simulation results are compared with PSCAD to
validate the correctness and effectiveness of the design.
The large-scale integration of wind power plays an increasingly important role in power systems. Accurate and effective
modeling and simulation methods of wind power are urgently
demanded. This paper studies the actual wind power generation over time, and proposes an electromagnetic transient
model of wind power generation. Also, the hybrid transient
(electromagnetic transient and electromechanical transient)
programs are implemented with the consideration of the electromagnetic networks of wind-farm sides and electromechanical networks of Jilin-Grid sides, respectively. The proposed
wind power generation model is verified through real measurement data. The proposed work is promising for the electromagnetic transient wind power integration research.
TuA04.44
Simulation analysis of low voltage control in rural areas based on PSCAD
pp. 407-412
TuA04.42
Beibei Zhang
A Fast Modeling Method of Distribution System
Reconfiguration Based on Mixed-integer Second-order Cone Programming
pp. 397-401
Xiaoyun Huang
Haoran Ji
Peng Li
Guanyu Song
Jinli Zhao
Foshan Power Supply Bureau
Guangdong Power Grid Corporation
Tianjin Univ.
Tianjin Univ.
State Grid Tianjin Economic Research Inst.
Wen Lu
Yulin Zhang
Hongwei Du
Foshan Power Supply Bureau
Guangdong Power Grid Corporation
Tianjin Univ.
Tianjin Univ.
Tianjin Univ.
Tianjin Univ.
NARI Tech. Co., Ltd
NARI Group Corporation
NARI Tech. Co., Ltd
NARI Group Corporation
NARI Tech.Co., Ltd
NARI Group Corporation
NARI Tech.Co., Ltd
NARI Group Corporation
In order to study the causes and treatment measures of low
voltage in countryside distribution network, this paper takes a
district of Hubei distribution network as an example, using the
electromagnetic transient simulation software PSCAD to carry
out a three-phase model, by adopting the combination of theoretical analysis and simulation modeling method researchmethods, completed the quantitative analysis of the factors
influencing about the quality of voltage, breakdown and comprehensive control measures was given. The results will help
the region according to their own input costs and voltage requirements to take appropriate management strategies.
Network reconfiguration is a primary means of changing the
operation mode of the distribution system with distributed
generation. A model for the distribution system reconfiguration problem based on mixed-integer second-order cone programming is presented in this paper. Firstly, the network reconfiguration model is built to minimize the active power losses of distribution system with distributed generation. Then,
some equivalent conversion and relaxation are presented to
cast the initial mixed-integer nonlinear model above into a
mixed-integer second-order cone model, which can be reliably
19
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Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
TuA04.45
TuA04.47
LabVIEW FPGA based Electromagnetic Transient
Simulator Using Nodal Analysis Methods and
State-space Analysis Methods
pp. 413-417
Research into Probabilistic Representation of
Electric Vehicle’s Charging Load and Its Effect to
The Load Characteristics of The Network
pp. 426-430
Can Huang
Yao Xu
Chad Harley
Drew Masters
Fangxing Li
Yanning Li
Jinguo Zhang
The Univ. of Tennessee at Knoxville
Lamar Univ.
The Univ. of Tennessee at Knoxville
The Univ. of Tennessee at Knoxville
The Univ. of Tennessee at Knoxville
Tsinghua Univ.
State Grid Jiangsu maintenance company
The uncertainty in the temporal and spatial distribution of
electric vehicle’s (EV) charging load will directly affect the
network’s load pattern and other operational characteristics.
This paper analyses the key factors which can affect the EV’s
charging load. Based on the data obtained from the EV charging terminals of a technology park in Beijing, the EV charging’s starting time, duration and charging power are analyzed
in terms of their probability distribution and probability density function. EV load’s temporal and spatial probability representation and the charging load’s expected model are then
analyzed. Using Beijing area’s summer load as a case study, the
EV’s unregulated charging and its effect to the distribution
network’s load characteristic is analyzed under different EV
penetration levels.
In the community of electric power systems, it is always desired to perform accurate and fast simulation, especially for
transient studies. This brings great challenges to electromagnetic transient program (EMTP), and demands electromagnetic transient simulators with larger scale, higher speed, lower
cost, and better expansibility and functionality. This paper
briefly reviews the modeling and computing methods of EMTP,
and analyzes the ongoing challenges and opportunities of
EMTP simulators. Later, a new electromagnetic transient simulator is designed using multiple LabVIEW FPGAs. This simulator efficiently performs electromagnetic transient simulation with nodal analysis methods or state-space analysis methods, and presents the low-cost, easily expandable, and user-friendly programing advantages.
TuA05.1
TuA04.46
Optimal Scheduling of Active Distribution Systems for Transregional Utilization of Renewable
Energy
pp. 431-436
Research and Implementation of the Simulation
Model and Algorithm of Multi-terminal
VSC-HVDC Transmission System in DTS
pp. 418-425
Jinyue Shi
Bo Zeng
Yiyao Zhou
Jianhua Zhang
Xiong Zheng
Xu Yang
Wenhui Wei
Shujin Zhou
Yunjun Zhao
Jihong Xia
Zhengping Chen
Beijing Kedong Electrical Power
Control System Co. Ltd
Beijing Kedong Electrical Power
Control System Co. Ltd
Beijing Kedong Electrical Power
Control System Co. Ltd
Beijing Kedong Electrical Power
Control System Co. Ltd
State GridFujian Electric Power Co
In this study, the optimal operation of active distribution system (ADS) is investigated considering renewable energy harvest in cross regions under a multi-objective optimization
framework. For this end, we first deduce the active/reactive
capability of renewable distributed generation(RDG) units
under the decoupled state. On this basis, a multi-objective
model for ADS scheduling is developed, which considers the
minimization of operation cost, renewable energy curtailment
and network losses simultaneously. In this model,various types
of distributed energy resources, including RDG,energy storage
and interruptible loads are incorporated collectively, and the
inter-temporal constraints that associated are especially accounted for. The proposed optimization problem is solved by
the Multi-objective Harmony Search (MOHS)algorithm. The
effectiveness of the proposed method is verified on a modified
33-bus distribution system, and the necessity for incorporating
reactive capability of renewable-based DG units is also revealed.
Based on the part of DTS in smart grid dispatch control system, we have a research on steady-state simulation model of
multi-terminal VSC-HVDC (Voltage Source Conveter-High
Voltage Direct Current) and hybrid solution algorithm of
AC/DC system, and propose the alternating solution algorithm
based on the Newton-Raphson method in this paper. Finally, a
simulation example is given, and the correctness and effectiveness of the proposed model and algorithm in this paper are
verified by the results of example.
November 26-29，2015 Changsha，China
North China Electric Power Univ.
North China Electric Power Univ.
North China Electric Power Univ.
North China Electric Power Univ.
North China Electric Power Univ.
North China Electric Power Univ.
20
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
always need additional backup to mitigate the fluctuating
power. This additional backup results in increased investment
and operational costs. The V2G storage in such a situation can
act as energy buffer and can supply the microgrid with balancing services at low costs. However the availability of the
power from the V2G storage is also intermittent in nature because of the random plug-in pattern of electric vehicles. In this
paper a microgrid containing a wind, PV and diesel generation
and energy storage (V2G/fixed) is connected to an external
grid. The external grid has the problem of capacity shortage.
Because of the intermittent energy sources, a novel multi-objective stochastic chance constrained programming model
is developed for the operational-planning of microgrid. The
multiple objectives include the minimization the total net present cost and the operating hours of the diesel generation subject to constraints. The time series data for wind speed, solar
radiation, V2G plug-in pattern and load fluctuation is estimated by using the Metropolis-Hastings algorithm,which is a
Markov chain Monte Carlo Method. Due to the conflicting
objectives, the non-dominant solutions are sorted out and presented using the Pareto front. The simulation results show confidence levels of provision of power by V2G storage and renewable energy sources. The results further show substantial
economic implications of V2G storage on microgrid operation
in terms of minimization of the total net present cost.
TuA05.2
Optimal Capacity Expansion-Planning of Distributed Generation in Microgrids considering Uncertainties
pp. 437-442
Asad Waqar
Shaorong Wang
Samir M. Dawoud
Tao Tao
Yida Wang
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
State Grid Hangzhou Electric Power Supply
Company
State Grid Hangzhou Electric Power
Supply Company
Capacity shortage problem extensively occurs in the developing countries. Microgrids comprising of distributed generation
provides a solution to this capacity shortage problem.However
an optimal capacity expansion-planning of the distributed
generation in a microgrid is necessary to satisfy the load demand most economically. In current research the capacity expansion-planning of distributed generation like wind, solar,diesel generation along with energy storage is carried out
considering the uncertainties associated with wind speed, solar
radiation and load fluctuation. The account of uncertainties is
very important as it results in a more reliable and robust planning model. These uncertainties are estimated by using their
expected values based on the probability distributions and the
autoregressive model is used to generate the scenarios. A stochastic optimization approach is used for optimal capacity
expansion planning with multiple objectives including the
minimization of the total net present cost, emissions and
non-renewable fraction in the presence of constraints. A microgrid in grid-connected mode is utilized for the example
problem. Because of the conflicting objectives, the
non-dominant and most near to the optimal solutions are presented using the Pareto fronts. The results from both stochastic
and deterministic optimization approaches are compared.The
results support the investment and hence the capacity expansion.
TuA05.4
The Planning of Distribution Network Containing
Distributed Generators Based on Mixed Integer
Linear Programming
pp. 449-453
Jinyue Shi
Ying Qiao
Yingrui Wang
Junqiang Wen
Jingjing Tong
Jianhua Zhang
TuA05.3
Currently, the methods for solving the planning of distribution
network (DN) are meta-heuristic algorithms whose computational efficiency is low and the results are not accurate. Therefore, this paper uses the advanced mixed integer linear programming (MILP) technology to model the multi-conductor
DN planning containing the allocation of distributed generator(DG). Firstly, replace power flow calculation with an equivalent cone programming, then remove the product terms of
binary and continuous variables, and finally use polyhedral
models which are linear to approximate the planning model. In
addition, as the siting and sizing of DG are added to the network planning, the situation that part of the loads are supplied
by the DG separately perhaps appear thus leading to the appearance of loops. So the spanning tree (ST) constraints are
introduced to the model to ensure the radiation of the DN.
Finally, 23-node distribution system is used to simulate the
above-mentioned model, and the results show the effectiveness
and efficiency of the proposed model.
Multi-objective Chance Constrained Programming Model for Operational-Planning of V2G
Integrated Microgrid
pp. 443-448
Asad Waqar Huazhong
Shaorong Wang
Muhammad S. Khalid
Xiaohan Shi
North China Electric Power Univ.
North China Electric Power Univ.
North China Electric Power Univ.
North China Electric Power Univ.
North China Electric Power Univ.
North China Electric Power Univ.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Shandong Univ.
This paper presents a novel chance constrained programming
model for the operational-planning of a microgrid containing
renewable energy sources like wind and solar, and vehicle to
grid (V2G) storage. The model investigates the economic implications of the V2G storage on the microgrid operation.The
microgrids consisting of intermittent renewable energy sources
21
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Haozhong Cheng
Qi Zuo
TuA05.5
Electric power network planning based on multi-object optimization model
pp. 454-458
Linhao Ye
As its sampling frequency is independent of the scale of the
system, Monte-Carlo simulation is widely applied to reliability
evaluation of generation and transmission system,which is a
complex large system. However, it takes a relatively long period to obtain a higher accurate reliability index. This paper
points out that, the combination of Importance sampling
method and Discrete Latin Hypercube sampling method is able
to reduce the variance of the sample space and uniformly sample it simultaneously, which improves the convergence of
MonteCarlo simulation. Besides, the combination of sensitivity
analysis and linear programming in the process of overload
correction is able to guarantee the solution optimality as well
as improve the solving speed. Finally, the practicability of the
proposed algorithm is verified with the case study in IEEE
RTS79 and RTS96.
South China Univ. of Tech.
Guangdong Power Grid Foshan Power Supply Bureau
Aiming at solving network planning problems brought by multi-stage and multi-objection, in this paper, a multi-objective
optimization method of network planning is proposed. Considering taking economy and reliability into account,with the
objective function of the minimum cost of investment, the
minimum annual operating costs of the system and the minimum lack of electricity costs, a general optimized model of
multi-objective electric power network planning is presented.
The hierarchical optimization model and hybrid genetic-simulated annealing algorithm is used to solve the problems
emerging in the process of multi-objective planning. Case
proves the effectiveness and scientifically of the proposed
method and algorithm.
TuA05.8
Reliability Evaluation of W ind Integrated Composite Power System Based on Third-Order Polynomial Normal Transformation
pp. 472-477
TuA05.6
Weighted Cloud Prediction Model for Distribution Network Reliability
pp. 459-464
Biyun Chen
Liwen Qin
Qingyu Wang,
Shaonan Chen
Bo Zhao
Shanghai JiaoTong Univ.
North China Electric Power Univ.
Qinyong Zhou
Hailei He
Pingliang Zeng
Taishan Yan
Haozhong Cheng
Libo Zhang,
Guangxi Univ.
Guangxi Univ.
Guangxi Univ.
Guangxi Univ.
Guangxi Univ.
China Electric Power Research Insti.
China Electric Power Research Insti.
China Electric Power Research Insti.
Shanghai Univ. of Electric Power
Shanghai Jiao Tong Univ.
Shanghai Jiao Tong Univ.
To overcome the drawback that wind speed distribution is
assumed in the reliability evaluation of wind farms integrated
power system, the third-order polynomial normal transformation (TPNT) based non-sequential Monte Carlo simulation
method, is proposed to evaluate the reliability of generation
and transmission system incorporating wind farms in this paper. When historical data or distribution functions of wind
speed are given, the relationship between wind speed distribution and standard normal distribution can be established with
the TPNT.Then correlated wind speed samples, which are employed in the process of reliability evaluation, can be produced
through TPNT and correlated normally distributed samples.
The accuracy of TPNT to simulate variables and applicability
of the proposed method were verified by case study. Based on
that, impacts of wind farms on composite power system are
studied from four aspects, including wind speed correlation,
location, rate capacity and wind source intensity.
Aiming at the difficulty of determining the exact topology of
distribution network during long-term reliability evaluation, a
weighted cloud prediction model is proposed to predict the
reliability of distribution network in long-term planning.
Firstly, the digital features of cloud model of the influencing
factors are obtained from the statistical historical data by an
improved backward cloud generator. Secondly, based on the
above digital features, the average weighted cloud prediction
model are set up where the weight of each influencing factor is
calculated by analytic hierarchy process according to the sensitivity of the influencing factors on reliability. Finally, the
effectiveness and feasibility of the proposed method is demonstrated by comparison with the traditional cloud prediction
method and the least square support vector machine method
from the indices of maximum, minimum and average error.
TuA05.7
TuA05.9
Reliability Evaluation based on Modified Latin
Hypercube Sampling and Minimum Load-Cutting
Method
pp. 465-471
A Comprehensive Energy Saving Potential
Evaluation Method for the Distribution Networks
pp. 478-481
Hailei He
Qinyong Zhou
Tengfei Sun
Biyun Chen
Tangshan Cui
Lei Ye
Cuizhen Li
China Electric Power Search Inst.
China Electric Power Search Inst.
Shanghai JiaoTong Univ.
November 26-29，2015 Changsha，China
22
Guangxi Univ.
Guangxi Univ.
Guangxi Univ.
Guangxi Univ.
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
The construction projects for distribution networks require
good economy besides energy saving and voltage quality improvement. Thus the line loss rate and voltage qualification
rate are the main assessment indices of construction projects
for distribution networks. This paper proposes a comprehensive energy saving potential (ESP) evaluation system for distribution networks. The above basic indices and comprehensive ESP indices for each selected feeder are calculated under
different improvement measures. Firstly, typical feeders are
modeled using Power Factory software. Then power flow for
distribution networks is calculated and weak networks can be
found. Secondly,improvement measures for typical feeders can
be chosen based on weak networks analysis to achieve the
purpose of reducing the power loss rate. Thirdly, the paper
gives the definition of loss reduction rate, voltage improvement
rate and economic benefits.Furthermore, the implementation
order of the measures is optimized according to the value of
comprehensive ESP indices and the difficulty extent of implementation. The investment cost and the transformation effect
are considered simultaneously for planning. Four measures
which include replacing high-loss transformers and worn
conductors, adding reactive power compensation devices and
adjusting bus voltage are carried out on the IEEE 33-bus test
system. The results of simulation calculation demonstrate the
validity and superiority of the proposed system.
TuA05.11
Reactive Power Optimization Based on Modified
Membrane Computing for Distribution Network
with Electric Vehicles And W ind Power Generat i on
pp. 488-493
Siyuan Wang
Yongjie Lv
Shuying Ding
Xiangyan Xie
Zhuyun Li
Hongjian Wu
The rapid development of plug-in hybrid electric vehicles and
renewable generation brings new challenges to the secure and
economic operation of power systems. A reactive power optimization model based minimizing network loss is established,
considering electric vehicle stochastic charging /discharging
and uncertain outputs of wind turbines. To improve the accuracy and global searching capability, The modified membrane
computing (MMC) based communication rule, cross transposition rule and mutation rewrite rule is proposed. Finally,the
modified IEEE-33 nodes system is simulated through the proposed algorithm and general GA. The effectiveness and correctness of the proposed method and model are verified.
TuA05.10
TuA05.12
The Whole-process Reliability Evaluation of
Power System Including Generation, Transmission,Transformation and Distribution
pp. 482-487
Biyun Chen
Qianyi Chen
Jinan Power Supply Company, State Grid
Jinan Power Supply Company, State Grid
inan Power Supply Company, State Grid
Jinan Power Supply Company, State Grid
Xihua University
Xihua University
A Method of Evaluating the Transfer Capacity for
Power System Considering of the Power Injection and the Power Grid Topology
pp. 494-499
Guangxi Univ.
Guangxi Univ.
Suyun Wang
Zhigang Wu
Zibin Yu
Baorong Zhou
Aiming at the problem that using current reliability evaluation
indices, which can reflect only one segment of power system,
for power system planning leads to partial planning results and
is hard to achieve the goal of global programming,this paper
proposes an approach to evaluate the reliability of the entire
power system, considering the effect of generation, transmission, transformation and distribution system. The power supply reliability not only depends on the structure of the distribution system, but also on the main grid. In the proposed
evaluation procedure electrical connection of substation is
firstly equated to some equivalent branches based on minimal
cut-set method. Then Monte Carlo Simulation (MCS) is used
to assess the reliability of generation and transmission composite system and substation system simultaneously by sampling
and to obtain hierarchical available capacities and probabilities. Finally, the hierarchical reliability indices of the main grid
are used as multistate equivalent sources to assess the distribution system reliability. The proposed method is tested using a
system constituted by the IEEE RTS 79 and feeder of IEEE
RBTS-bus6. The results show that the main grid has obvious
influence on the reliability of distribution system, and the proposed method can provide more details for system planning
and operation.
South China Univ. of Tech.
South China Univ. of Tech.
South China Univ. of Tech.
Southern Power Grid
The transfer capacity is a varying value for a certain power
system, which may be changed with the evolution of the system.
Although the topology of a power system is usually designed in
an optimizing way to maximize the transfer capability, the
capability itself will be inevitably weaken because of a time lag
between the increasing load and the enhancement of grid topology. Due to the lack of qualification tools to deal with the
varying transfer capability, related topics are seldom to be
discussed. This paper proposes a new method to evaluate the
transfer capacity, in which the mechanism describing the mismatch can be boiled down to a new index named Spatial
Characteristic Length Ratio (SCLR) considering of both the
power injection and the power grid topology. By calculating
the index SCLR, the transfer capability as well as the factors
affecting it can be analyzed, which has an important meaning
for power grid planning personnel. The method is used to analyze the transfer capacity of IEEE 4-node system, IEEE 9-node
system and IEEE 162-node system, each under different modes
of operation. Calculation results has proved the validity of this
concept, and the related method is effective.
23
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
TuA05.13
TuA05.15
Transmission Network Expansion Planning Based
on Coordinated Economy and Security
pp. 500-505
Research on the Topology of DC Distribution
Network and the Influence of Distributed Generations Access to the Network
pp. 512-517
Taishan Yan
Libo Zhang
Haozhong Cheng
Hailei He
Qinyong Zhou
Pingliang Zeng
Shanghai Univ. of Electric Power
Shanghai Jiao Tong Univ.
Shanghai Jiao Tong Univ.
China Electric Power Research Insti.
China Electric Power Research Insti.
China Electric Power Research Insti.
Tianhao Liu
Gengyin Li
Bing Han
Dongdong Zhang
Singirankabo Youssouf
Transmission network expansion planning (TNEP) is a key
component of power system planning. Two important aspects
to be considered in TNEP are economy and security factors,
which are always contradictory and affect the benefits of both
investment and power demand side, so the balance between
these two factors needs to be focused. In this paper, a TNEP
model based on coordinated economy and security is proposed
so as to reconcile these two contradictory factors. The objective
function of proposed TNEP model is to minimize the annual
synthetic cost of transmission system, which contains investment cost,operation cost, maintenance cost and load shedding
cost. The annual synthetic cost of transmission system is calculated with multistep load model established by load clustering using improved K-means algorithm. Then, an improved
niche genetic algorithm is utilized to solve the TNEP model and
an optimal scheme is obtained. Furthermore, the applicability
and effectiveness of proposed TNEP model and algorithm are
verified by case study on IEEE 24-bus system.
North China Electric Power Univ.
North China Electric Power Univ.
North China Electric Power Univ.
North China Electric Power Univ.
North China Electric Power Univ.
Recent years the research of DC power distribution network is
getting more and more attention which mainly focus on the
technical and economic analysis, power conversion technology,
control and protection technology aspects. In this paper we
calculate the DC distribution network line loss and the voltage
unbalanced distribution by DC flow calculation analysis under
different topologies. According to the simulation results of
steady state power flow of DC power distribution network, we
analysis the influence of the distributed generations and network structure on the voltage distribution and network loss.
The results show that the structure of the DC distribution
network directly affects the network loss and the unbalance of
voltage distribution, and the mesh structure can improve the
absorptive capacity of the distributed generations. Access
points’ numbers and capacity of DGs can also influence both of
network loss and unbalance voltage distribution.
TuA05.16
TuA05.14
The Coordinate Evaluation of Grid Based on
Power Import and Export Capacity
pp. 518-522
A Peak Load Regulation Scheme for Hubei Power
Grid with UHVDC Integration
pp. 506-511
Ni Zeng
Mei Li
Buhan Zhang
Ruoxi Zhu
Minwei Wang
Shuang Zhao
Chengxiong Mao
Wangcheng Long
Hui Li
Jinyu Xiao
Dong Peng
Xiao Wang
PengFei Zhang
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
The coordinate evaluation of grid is about the matching degree
between capacity of power import and export for a level grid,
it is important to power network planning. Considering the
power transmission direct, the definition of equivalent import
capacity and the equivalent export one are proposed,the import one includes generation, DC converter station, tie
line,step-up substation and so on, uniformly, the export one
includes direct load capacity, step-down substation and so on.
The coordinate evaluation criterion is present based on Code
about power system. Finally, a provincial power grid is used to
demonstrate the calculation of equivalent import capacity and
equivalent export one ， and the coordinate of the provincial
power grid is analyzed based on the evaluation criterion.
Under the background of transmitting thermal power via UHV
transmission line from Mengxi to Hubei in the long-term planning, this paper analyzed Hubei power grid’s peak load regulation scheme which Mengxi UHVDC involved in.Based on the
energy-efficient power generation scheduling approach and
multiple constraints of units, a peak load regulation scheme
under the coordinated operation of thermal power, hydropower, pumped-storage and UHVDC power in a calculating level
year was given. It is indicated that the peak regulation capacity
shortage problem in Hubei is solved effectively with Mengxi
UHVDC integration.
November 26-29，2015 Changsha，China
State Power Economic Research Inst.
State Power Economic Research Inst.
State Power Economic Research Insti.
State Power Economic Research Inst.
State Power Economic Research Inst.
State Grid Corporation of China
24
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
straint. The particle swarm optimization (PSO) algorithm and
MonteCarlo simulation method is used to solve the optimization problem. Taking a regional power network as an example,
Power System Analysis Software Package （PSASP ） is used
to carry out transient and steady stability verification for the
extreme scenario, and contingency plans for the accidents
which is not satisfied with the verification requirement must be
worked out to ensure the safe and stable operation of the network.
TuA05.17
A Multi-Stage Generator Reconfiguration
Method for Relieving Transmission Congestion
pp. 523-526
Yudong Tan
Zhisheng Xu
Bing Huang
Yong Li
Yi Tan
State Grid Hunan Economy & Tech.
Research Inst.
State Grid Hunan Economy & Tech.
Research Inst.
Hunan University.
Hunan University
Hunan University
TuA05.19
Comprehensive Risk Assessment Method of
Power Planning Scheme Considering Natural
Disasters
pp. 532-537
A reduced-voltage operation scheme of generator unit is proposed to relieve transmission congestion of 500 kV/220 kV
power grids. First, the initial generator reconfiguration
schemes are obtained according to voltage levels of generators
connected to power grids and the matching degree between
loads and generator capacity. Then, a comprehensive evaluation index is proposed by considering network loss, over-load
rate, voltage deviation rate and static voltage margin. This
index is used for the ranking of the above initial schemes. By
N-1 analysis, the final scheme is determined. The case study on
the eastern grid of Hunan province is used to validate the proposed method.
Hailei He
Qinyong Zhou
Qi Zuo
Jun Zhong
In order to hedge the small-probability high-risk events which
power system may face against, it is essential to consider the
impact of natural disasters in the power system planning stage.
First, this paper establishes the component damage probability
model under natural disasters. Second, the system risk assessment based on analytical method is discussed, and the indicators and algorithm for rapid line risk identification are proposed to alleviate the computation burden of the analytical
method. Finally, a comprehensive risk assessment method considering natural disaster is proposed based on PSD-BPA transient stability program. The case study performed in the actual
systems verifies that the proposed indicators and method are
accurate and effective.
TuA05.18
A Planning Method for Siting and Sizing of Distributed Generation Based on
Chance-constrainedProgramming
pp. 527-531
Zhaoxia Sun
Weiwei Li
Jinfeng Zhu
Qiangmin Liu
Tianci Liu
China Electric Power Research Insti.
China Electric Power Research Insti.
North China Electric Power Univ.
Chongqing Univ.
Suizhou Power Supply Company
State Grid Hubei Electric Power Corporation
Suizhou Power Supply Company
State Grid Hubei Electric Power Corporation
Suizhou Power Supply Company
State Grid Hubei Electric Power Corporation
Suizhou Power Supply Company
State Grid Hubei Electric Power Corporation
Suizhou Power Supply Company
State Grid Hubei Electric Power Corporation
TuA05.20
Risk-based Transmission Lines Importance Calculation under Ice Storm Weather
pp. 538-542
Yushen Hou
Xiuli Wang
Zechen Wu
Zece Zhang
With the increasing of the new energy’s permeability in the
regional power network, the inherent characteristics of new
energy output bring new challenges to the power network
planning. In order to solve the problem that the traditional
distribution network planning is too conservative for the new
energy planning, a planning method for siting and sizing of
distributed generation （DG ） based on Chance-constrained
programming is proposed in this paper. The method provides
an approach to calculate the new energy’s maximum installation capability and the optimal installation site for regional
power network Basing on the analysis of stochastic models of
wind power, solar output and load, the planning model has the
objective function of maximizing renewable energy utilization
with the considering of several constraint conditions such as
node voltage constraint and branch transmission power con-
Xi’an Jiaotong Univ.
Xi’an Jiaotong Univ.
Xi’an Jiaotong Univ.
Xi’an Jiaotong Univ.
A risk-based transmission lines importance calculation method
is proposed under ice storm to identify the importance of icing
lines to system operation in this paper. The model of forced
outage rate of icing line is established by load-strength interference theory. Then risk functions of demand not supplied
and power failures are established. The concept of transmission lines’ global sensitivity of risk functions is proposed to
quantify the influence of icing lines to system operation by
analysis of variance decomposition. The quasi-Monte Carlo
method based on Sobol’ sequence is used to calculate global
sensitivity of icing lines. The proposed method is tested on the
system of IEEE RTS79. The results show that different lines
have various importance to system risk and the importance
sorting of icing lines could be a feasible tool to help arrange the
deicing work.
25
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
single index and multiple weights respectively. Three comprehensive evaluation methods including Delphi, Entropy weight
method,grey relational analysis (GRA), which will help decision makers master and deal with the sensitive indexes and
weights more carefully in the decision-making process. Secondly, this paper takes comprehensive evaluation values of
each alternative obtained by each comprehensive evaluation
method with the change of index values and index weights as
sample data respectively,and introduces cloud model to compare the robustness of decision-making results under each
comprehensive evaluation method in order to evaluate the
advantages and disadvantages of each comprehensive evaluation method, this will help decision makers choose the comprehensive evaluation method with better robustness of decision result. Finally the example analysis results verify the effectiveness of the method proposed in this paper, so as to gain
insight into the sensitivity analysis of decision problem and
relate it back to real engineering application.
TuA05.21
Composite Power System Risk Assessment and
Weak Links Identification Considering Cascading
Failures
pp. 543-548
Chunzheng Tian
Yulong Zhou
Yuanyuan Wang
Jianxue Wang
State Grid Henan Economic Research Insti.
Xi'an Jiaotong Univ.
State Grid Henan Economic Research Insti.
Xi'an Jiaotong Univ.
Blackouts generally stem from cascading failures in power
system operation. Their diminution requires very much the
development of approaches and algorithms that analyze
cas-cading failure risk and identify weak links of power system.
Different from optimal load shedding model widely used in
conventional risk assessment, this paper considers the impact
of cascading failures on power system, and adopts a practical
re-dispatch model. A fault chain model is established to better
describe the propagation process of cascading failures and to
calculate the occurrence probability of cascading failures
quantitatively. To better understand how cascading failures
propagate and to effectively identify weak links that are crucial
for cascading failure propagation, this paper proposes the index called “risk participation factor” to measure the effect of
branches on the reliability level of power system. Besides,
Monte Carlo simulation method is applied to assess these indices. The proposed cascading failures model and fault chain
model are validated on the IEEE 39-bus system. Results show
that the proposed model that considers the propagation of
cascading failures can provide more weak links information
for power system planning and operation.
TuA05.23
The Stability Study and Simulation Analysis on
Multi–infeed AC–DC Hybrid Power System
pp. 557-562
Weiwei Zhao
Shunxin Li
Lihan Qin
Yichen Huang
It is planned that several ultra–large–scale multi–infeed
AC–DC hybrid power systems would be built in China by 2018.
In multi–infeed AC–DC hybrid power systems, since AC–DC
transmission lines are in parallel operation and the electrical
distances between many DC converters are very short, there
will be interactions between AC–DC hybrid power systems.
And this will bring new challenges to the operating characteristics analysis and stability control strategy of multi–infeed
AC–DC hybrid power systems. This paper begins with discussing complicated the interactions between AC–DC systems
and the interactions between DC systems in the multi–infeed
DC transmission system,and outlining the studies on researches of commutation failure of multi–infeed AC–DC hybrid
power system, DC system failure recovery, the power angle /
voltage stability problems, and etc.This paper sets up two indicators, namely Multi–infeed Short Circuit Ratio and Multi–infeed Interaction Factor, to measure the interaction extent
between the AC power systems and its connected DC power
systems. Then, the paper introduces the principle of emergency
DC power support and the support strategy of DC power increase and fallback. Next, the paper takes the Jibei Power Grid,
which is planned for 2018, as an example, using PSD simulation program to simulate and calculate the stability conditions
of Jibei Multi–infeed AC–DC hybrid power system. In the end,
the paper proposes the technical solutions for the structure
enhancement of AC systems and the additional stability control
strategy of DC systems, and etc., according to the simulation
results.
TuA05.22
Sensitivity Analysis for Decision-making of UHV
Long Distance Power Transmission Site Selection
under Uncertainty Based on Cloud Model
pp. 549-556
Weigang Jin
Yong Li
Xue Lin
Xiaoyun Guo
Xue Cui
Huijin Liu
Jiangpeng Fan
Central China Branch of State Grid
Corporation of China
Central China Branch of State Grid
Corporation of China
Wuhan Univ.
Wuhan Univ.
Wuhan Univ.
Wuhan Univ.
Wuhan Univ.
The selection of Ultra-High Voltage (UHV) substation site is a
complex multi-objective decision-making problem.The randomness of wind power output and continuous adjustment of
the grid structure will bring uncertain factors to the decision-making process, which will directly affect the stability of
decision-making result. Therefore, the sensitivity analysis is
necessary to be carried out to the uncertainty of index values
and index weights in the decision-making process. Firstly, this
paper carries out the sensitivity analysis under the change of
November 26-29，2015 Changsha，China
State Grid Jibei Electric Power
Economic Research Inst.
State Grid Jibei Electric Power
Economic Research Inst.
State Grid Jibei Electric Power
Economic Research Inst.
State Grid Jibei Electric Power
Economic Research Inst.
26
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
TuA05.24
TuA05.26
Study on Renewable Energy Integration Influence and Accommodation Capability in Regional
Power Grid
pp. 563-568
A Risk Assessment Approach for Power System
Based on a Comprehensive Fault Probabilistic
Model
pp. 574-577
Youjun Zhang
Ting Zhao
Dongxu Lu
Dong Wang
Yuan Zeng
anli Liu
Linjun Wei
Jing Li
State Nuclear Electric Power
Planning Design & Research Inst.
China Electric Power Research Inst.
State Nuclear Electric Power
Planning Design & Research Inst.
Wind power and photovoltaic (PV) power generation is currently scale developing with high speed in China. Due to the
uncertainty of wind power and PV power output, more reserve
and balance capacity is additional necessary caused by large
scale wind power and PV power integration, which bring a
challenge on the accommodation, accessing options, sending
out channel of the large scale of renewable energy. Development scale renewable energy is studied in this paper based on
considering government planning and preliminary progress.
Evaluation method of renewable energy generation capability
is submitted to analyze characteristic of wind and PV power.
The method of sequential production simulation based on
random unit commitment is presented to simulate daily operation of power system. Accommodation capability of renewable
energy integrated into power grid is study based on considering the layout of flexible and traditional power resource.
Traditional risk assessment methods focus on the power network side while ignoring the impacts of the information system.
A risk assessment approach for power system based on a comprehensive fault probabilistic model is proposed. The risk factors of the information system are considered in the model.Overload and voltage violation risk indices are adopted. The
risk indices thus gained can be used to help operators and the
planners to monitor the system, and make a more credible plan.
The correctness of the proposed approach is validated by
IEEE-118 bus test system.
TuA05.27
The Research on the Planning Model of Rural
Distribution Network Containing Diversification
Loads
pp. 578-582
TuA05.25
Investment Allocation Model Based on Gini
Coefficient and Its Application to Electric Power
Subsidiaries
pp. 569-573
Fuqiang Zhang
Hui Luo
Meizhao Liu
Nana Li
Dong Zhang
State Grid Smart Grid Inst.
Tianjin Univ.
Tianjin Univ.
Tianjin Univ.
Tianjin Univ.
Fuchun Zhang
Kexue Liu
Qi Zhang
Bo Tian
Wenjun Li
Lihan Qin
State Grid Energy Research Inst.
JiangSu Electric Power Company
JiangSu Electric Power Company
State Grid Energy Research Inst.
State Grid Energy Research Inst.
Qinhuangdao power supply company
Qinhuangdao power supply company
Qinhuangdao power supply company
Qinhuangdao power supply company
Qinhuangdao power supply company
Jibei Economic and Tech .Research Inst.
The accession of diversification loads containing DG and electric vehicles charging stations into distribution network has an
important impact on the distribution network planning and
operation. This paper proposes a planning model of rural distribution network containing diversification loads, which can
realize the integrated optimization planning including the location and sizing of DG, charging station location and capacity,distributed network frame construction and renovation.
Taking the diversification loads into account, and selecting the
minimum costs of investment, operation and environment as
the objective,the paper establishes the planning model of rural
distribution network containing diversification loads. The simulation results show the model can improve the economic and
environmental benefits.
In this paper, Gini coefficient is introduced into the allocation
of investments in electric power subsidiaries. First,three indicators including the return on total assets, future forecasted
electricity consumption and the investment to electricity sales
ratio are used to determine the initial allocation scheme of
future grid investment in subsidiaries. The initial scheme ensures benefits (efficiency) priority. Then, control indicators
such as the capacity-load ratio, power grid reliability are used
in designing investment allocation model based on the Gini
coefficient. The proposed model optimizes the initial allocation
scheme from the perspective of improving the fairness. Finally,
a provincial electric power company in China is taken as an
example to verify the feasibility of the proposed model.
27
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
TuA05.28
TuA05.30
Research on the Distribution Network Planning
with Multiple Loads
pp. 583-586
Optimal Planning of W ind and PV Capacity in
Provincial Power Systems Based on Two-Stage
Optimization Algorithm
pp. 593-598
Xinghua Don
Kexue Liu
Bo Tian
Zhongshu Hu
Kai Zhang
Youzhong Miao
State Grid Qinhuangdao power
supply company
State Grid Qinhuangdao power
supply company
State Grid Qinhuangdao power
supply company
State Grid Qinhuangdao power
supply company
State Grid Qinhuangdao power
supply company
Jibei development and planning department
Yue Yuan
Yang Cao
Jingjing Zhou
Jiangmin Bao
With the rapid development of wind power and photovoltaic
(PV) power industry, the curtailment of wind power or PV
power in ‘Three North’ areas is serious, due to their short
planning and construction time period, as well as being disjoined with the regional generation and grid plan. A novel
formulation based on two-stage optimization under low-carbon
economy is proposed in present paper to optimize the proportion of wind and PV capacity for provincial power systems, in
which, carbon emissions of generator units and features of
renewable resources are all taken into account. In the lower-level formulation, a time-sequence production simulation
(TSPS) model that is suitable for actual power system has been
adopted. In order to maximize benefits of energy-saving and
emissions reduction resulted from renewable power generation,
General Algebraic Modeling System (GAMS), a commercial
software, is employed to optimize the annual operation of the
power system. In the upper-level formulation, a hybrid bacterial foraging algorithm and particle swarm optimization
(BFAPSO) algorithm is utilized to optimize the proportion of
wind and PV capacity. The objective of the upper-level formulation is to maximize benefits of energy conservation and carbon emissions reductions optimized in the lower-level problem.
Simulation results in practical provincial power systems validate the proposed model and corresponding solving algorithms.
The optimization results can provide support to policy makers
to make renewable energy related policies.
Based on the different demands of distribution network planning, the paper establishes the economic model of distribution
network planning with multiple loads. In the paper,different
factors, which include the expenses of line construction and
operation, the generating expenses of multiple loads and the
power purchase cost, are considered in the objective function.Then, by using the genetic algorithm (GA), the capacity
and location of the multiple loads are analyzed. In the end, for
an example of a real distribution network, the feasibility of the
algorithm is verified.
TuA05.29
Two-step Optimization and Decision Model for
Opening Electromagnetic Loops
pp. 587-592
Xue Xia
North China Electric Power
Research Insti. Co., Ltd
State Grid Jibei Electric Power Company Limited
Dong Yang
State Grid Shandong Electric Power Research Inst.
TuA05.31
In order to improve the grid safety and stability, we put forward a two-step optimization and decision method for opening
electromagnetic loop circuits. Firstly, several parts from the
low voltage level network are separated in the electromagnetic
loop circuit using the GN dividing algorithm and complex
network theory according to the distribution of center stations
and the characteristics of network structures. The scheme set
for opening electromagnetic loop circuits is generated in accordance with the sequence that every part separated from the
network in the dividing process. Then, aiming at the contradiction between improving the system stability and limiting the
short circuit current, a comprehensive evaluation model based
on the analytic hierarchy process is built. The systematic and
quantitative assessments on opening electromagnetic loop circuits are realized by the fuzzy comprehensive evaluation algorithm. Case studies verify the effectiveness of the proposed
strategy.
November 26-29，2015 Changsha，China
Hohai Univ.
Hohai Univ.
Hohai Univ.
Hohai Univ.
Research on Probabilistic Load Flow Method
based on Point Estimation and Dimension Reduction by Dominated Variables
pp. 599-603
Yuanbing Xiao
Haozhong Cheng
Ting Lei
Shenxi Zhang
Weijie Luan
Di Yang
Shanghai Univ. of Electric Power
Shanghai Jiao Tong Univ.
State Grid Shanghai Municipal Electric
Power Company
Shanghai JiaoTong Univ.
Shanghai Jiao Tong Univ.
Shanghai Jiao Tong Univ.
There are many uncertain factors such as the random fluctuations of load, equipment failure out of operation and the outage of distributed generation changes with the climate in power system operation, probabilistic load Flow method gets more
attention. Meanwhile, with the system scale increase, the computational efficiency limits the application of probabilistic load
28
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
flow (PLF). Therefore, in this paper, a dominated variables
based point estimation method is proposed. A dimension reduction method is also depicted. And the point estimation samples are transformed into arbitrary correlated distribution by
polynomial normal transformation and singular value decomposition. Then the calculation of PLF is transformed into several deterministic power flow calculation. Simulation on IEEE
118 bus system demonstrates the validity of the proposed
method. The results show that proposed method can enhance
the computational efficiency of point estimation evidently. And
the utilization of singular value decomposition can easily handle the non-negative definite correlation matrix.
simulate charging demand of the electric vehicle . the models
are structured based on the bi-level programming, the upper
level model which aims at minimizing the sum of investment
costs of investment operators and charging costs of electric
vehicle users, the lower level model which aims at maximum
the captured traffic flow. Imperialist competitive algorithm
(ICA) and integer programming algorithm are applied to solve
the upper and lower level model of the bi-level programming
model, respectively. The case study shows that the proposed
model and method for the charging stations planning is reasonable and effective.
TuA06.1
TuA05.32
A Reactive Power Compensation Method Based
on Tracing the Power Flow and Loss Function of
Power System
Application of Cuckoo Search Algorithm in Power Network Planning
pp. 604-608
Shuxin Tian
Haozhong Cheng
Libo Zhang
Shaoyun Hong
Tengfei Sun
Lu Liu
Pingliang Zeng
pp. 615-619
Shanghai Jiao Tong Univ.
Shanghai Jiao Tong Univ.
Shanghai Jiao Tong Univ.
Shanghai Jiao Tong Univ.
Shanghai Jiao Tong Univ.
Shanghai Jiao Tong Univ.
China Electric Power Research Inst.
Ke nan Yang
Yiyu Gong
Pu Zhang
Zhaoyan Liu
Cuckoo Search algorithm is a new bio-inspired algorithm,
which describes cuckoo’s foraging behavior based on parasitized breeding mechanism of cuckoo’s egg and Lévy flight
search principle. Cuckoo Search algorithm can explore solution space as much as possible and jump out the local best
flexibility. Combined with truncation and rounding theory,
Cuckoo Search algorithm is improved to apply to power network planning, which is introduced to solve power network
chance-constrained integer planning model and search the
global optimal solution. The effectiveness and feasibility of the
improved Cuckoo Search algorithm solving power network
planning model are verified by taking 77-bus system as computational examples. Compared with particle swarm optimization algorithm and genetic algorithm, the proposed algorithm
has less parameters and more powerful ability of global
searching.
This paper proposes a new method for locating and sizing of
reactive power compensation of power system. The proposed
method is based on the reactive power flow tracing. Defines the
power loss distribution coefficient, which has direct response
distribution of reactive power sources with clear physical concepts. Utilize this new factor to determine the points of compensation. Calculate the second order loss sensitivity, combined with the principle of most economical operation, to determine the optimal capacity. Application of proposed method
is useful for the optimization of reactive power distribution
and the reduction of power loss. The simulation result of the
IEEE 39-bus system shows the correctness and effectiveness of
the proposed method.
TuA06.2
TuA05.33
A Generation-Reserve Co-optimization Approach
Considering W ind Power Cross-regional Accommodation
Electric Vehicle Charging Stations Layout Research Based on Bi-level Programming
pp. 609-614
Gang Zhang
Hongming Yang
Jinjun Dong
Beijing Maintenance Company
Beijing Electric Power Corporation
Beijing Power Economic Research Inst.
Beijing Electric Power Corporation
Beijing Power Economic Research Inst.
Beijing Electric Power Corporation
Beijing Power Economic Research Inst.
Beijing Electric Power Corporation
pp. 620-625
Changsha Univ. of Science and Tech.
Changsha Univ. of Science and Tech.
Changsha Univ. of Science and Tech.
Mu Wang
Ming Zhou
Hongkun Bai
Jiangbo Wang
As public service infrastructure of the city, the locating and
sizing of electric vehicle charging stations should be based on
actual charging demand. Obtaining the path traffic flow via
introducing the stochastic user equilibrium (SUE) assignment
model, the size configuration method of charging stations is
proposed by combining with the user travel behavior rules to
North China Electric Power Univ.
North China Electric Power Univ.
State Grid Henan Economic Research Inst.
State Grid Henan Economic Research Inst.
In recent years, the wind power industry of China has a rapid
development. However, because of the uncertainty, randomness and fluctuation nature of wind power, the problem of its
integration and accommodation has become the bottleneck of
its sustainable development. Cross-regional accommodation
29
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
has emerged as an attractive and challenging research area
due to the fact that wind energy resource is usually far away
from load center and hard to be used locally. Thus, a generation reserve co-optimization dispatch method for wind power
integrated power system considering cross-regional accommodation is proposed in this paper. Considering the prediction
errors of wind power and load demand and also equipment
failures, the reserve requirement for each area is calculated
based on the theory of conditional value-at-risk. Further, generating units are scheduled optimally, and the geographical
allocation and levels of the required reserves are determined
taking into account interregional transmission line constraints.
The aim of this paper is to promote the wind power accommodation in a larger spatial scale and also the system efficiency
from both the economic and security point of view. The reasonableness and effectiveness of the constructed model is validated by case study.
bility index lost of load probability (LOLP) and reliability index expected energy not served (EENS) deviate eachother. In
this paper, unit commitment (UC) formulation is revised to
optimize day-ahead generation schedule for those systems with
high wind power penetration level. In the revised UC formulation, conventional deterministic constraint on spinning reserve
(SR) is replaced by a chance constraint on reliability index
LOLP and minimum optimization objects is extended by expected interruption costs estimated by a product of EENS and
the value of lost load (VOLL). With considerations of stochastic fluctuations of load/wind power together with random outages of generators, an analytic algorithm is presented to calculate reliability indices LOLP and EENS. Genetic algorithm
(GA) is utilized to solving the revised UC formulation. In addition, an intelligent mutation operator (IMO) is specifically
designed to improve the performances of the GA. Simulation
results on certain 10-unit case system have proven the efficiency of the methodology proposed here.
TuA06.3
TuA06.5
Research on a Two-stage Optimization Algorithm
for Multi-objective Reactive Power Optimization
of Distribution Network
pp. 626-631
Fei Gao,
Yu Zhang
Jianfang Li
Xueping Feng
Xiaohui Song
Research on Transmission Cost Allocation of
MultiTerminal Transmission Line
pp. 638-641
Fuqiang Zhang
Junshu Feng
Jianhua Bai
Dong Zhang
China Electric Power Research Inst., CEPRI
China Electric Power Research Inst., CEPRI
China Electric Power Research Inst., CEPRI
China Electric Power Research Inst., CEPRl
China Electric Power Research Inst., CEPRI
This paper, on the basis of the existing literature, proposes a
new allocation method combining MW-Mile method with post
stamp method for transmission cost allocation of multiterminal
transmission line, which can follow the principles of allocating
by utilization and balance the payments. Besides, the methodologies of economic comparisons of coal transportation and
power transmission have been expanded. Finally, an example
based on the first UHVAC transmission line on JindongnanNanyang-Jinmen in China has been given and the comprehensive method is applied in this paper.
This paper proposes a two-stage optimization algorithm for
multi-objective reactive power optimization of distribution
network. In the first stage, an approximate Pareto solution set
is obtained using traditional multi-objective optimization algorithm. Then the preferred area for searching is calculated with
the preference information of Decision Maker (DM) and the
approximate Pareto solutions. In the second stage, an improved dominance relation is proposed to guide the particles of
multiobjective particle swarm optimization (MOPSO) to focus
on a deep searching in preferred area, with a high calculation
efficiency. The case in IEEE 33-node system verifies that compared with the traditional multi-objective reactive power optimization, the method proposed in this paper has a large improvement in generation distance(GD), spacing(SP), error ration(ER) and reduce the optimization time.
TuA06.6
Optimal Scheduling of Active Distribution Networks with Energy Storage Systems Considering
Environmental Cost
pp. 642-647
TuA06.4
Rongrong Bao
Wen Zhang
On Day-ahead Scheduling Based on Chance Constrained with Significant W ind Power Penetrat i on
pp. 632-637
Xinsong Zhang
Jingfeng Mao
Shandong Univ.
Shandong Univ.
Along with the increasingly serious environmental issues, besides economic efficiency, much attention is paid to the environmental aspects in the daily dispatch of active distribution
networks (ADN). This paper presents a comprehensive optimal
model to minimize the economic cost and environmental cost.
The damage cost from gas emissions and the uncertainty of
renewable generations are taken into consideration. The
charging and discharging strategy of energy storage systems
Nantong Univ.
Nantong Univ.
Large-scale integrations of wind power increase stochastic
nature of generation schedule decision, and might make relia-
November 26-29，2015 Changsha，China
State Grid Energy Research Inst.
State Grid Energy Research Inst.
State Grid Energy Research Inst.
State Grid Energy Research Inst.
30
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Hongji Xiang
Jie Ming
Han Li
Yu Zhuo
Chaohua Dai
Xintao Xie
Mengjiao Li
(ESS) is a focus of the model. The general algebraic modeling
system (GAMS) is used to solve this mixed-integer nonlinear
problem. A modified 33-bus distribution network including
photovoltaic (PV) systems and ESSs is employed to illustrate
the effectiveness of the proposed method. Simulation results
under different scenarios, with and without PVs/ESSs, show
that utilization of charging/discharging strategy of ESSs can
decrease the economic cost through peak load shifting. Moreover, increasing the penetration of renewable generations leads
to the decrease of total cost.
The widely use of wind power generation in modern power
system exerts much pressure on peak regulation, especially
after the large-scale wind power plants was connected to the
grid. Information of newest researches about wind power integration and peak regulation are introduced at the beginning of
the paper. Although there are many methods and theory about
increasing the peak regulation capacity proposed, it is hard to
avoid wind curtailment totally. In this paper, the operation
costs of wind power plants are calculated and it can be inferred
that the output of wind power plants and the unit cost of electricity has a nonlinear inverse relationship. Therefore, an appropriate wind curtailment capacity can exert prominent effects on improving the peak regulation ability with low costs.
According to the situation that there are many provinces affluent in both water and wind resources, the optimized wind
and water combined curtailment strategy is proposed in this
paper. It can make the capacity of wind curtailment stay in an
appropriate range with the cooperative work of water curtailment. Wind castoff rate and peak adopting rate are calculated
in the paper to provide criterion for optimizing the ratio between wind and water curtailment, in order to increase the
peak regulation capacity with low cost, especially for the areas
which affluent in water resource. In the second half of the paper, a calculate example come from Houlong area of Hunan
province is processed by the optimized method. The results and
analysis demonstrate that the optimized wind and water combined curtailment strategy is effective and adaptability.
TuA06.7
Coordinated Optimization of Unit Commitment
and DC Transmission Power Scheduling Using
Benders Decomposition
pp. 648-653
Bin Wang
Ye Xia
Haiwang Zhong
Qing Xia
Huiling Zhang
Hongwei Han
Tsinghua Univ.
Tsinghua Univ.
Tsinghua Univ.
Tsinghua Univ.
Ningxia Power Dispatching & Control Center
State Grid Cooperation of China
Ningxia Power Dispatching & Control Center
State Grid Cooperation of China
In response to the challenges brought by generation scheduling
with hybrid AC/DC transmission system, this paper presents a
hybrid scheduling mode for coordinated optimization of unit
commitment and DC transmission power scheduling. Considering the characteristics of both units and DC transmission
system, the optimal unit commitment and operation state of
DC transmission system are acquired to achieve the best system economic profit, while AC/DC transmission constraints
are also delicate formulated in the model to ensure the security
of scheduling results. Since this coordinated optimization model is a large scale mixed integer nonlinear optimization problem, the Benders decomposition method is employed to tackle
the computational difficulties. The coordinated optimization
model is decomposed into a master problem to optimize unit
commitment and DC transmission power without considering
AC/DC transmission constraints, and hourly security check
sub-problems which check the power flow violations caused by
inappropriate results of unit commitment and DC transmission
power schedule obtained by the master problem. Corresponding solution procedure and iteration algorithm are proposed to
enhance convergence and computation efficiency, in which
parallel computation technique is implemented to accelerate
the convergence. Numerical results based on the CEPRI
22-bus system validate the effectiveness of our proposed
method.
TuA06.9
Reactive Power Optimization and Control Considering Penetration Reactive Power for UltraHigh Voltage Power System
pp. 659-662
Di Yang
Haozhong Cheng
Shuxin Tian
Tengfei Sun
Zeliang Ma
Pingliang Zeng
Shanghai Jiao Tong Univ.
Shanghai Jiao Tong Univ.
Shanghai Jiao Tong Univ.
Shanghai Jiao Tong Univ.
East China Grid Company Limited
China Electric Power Research Inst.
With the development of UHV (Ultra-High Voltage) transmission, great changes have occurred for the reactive power distribution. Especially the reactive power of UHV transmission
varies with the different transmission power. Therefore, reactive power optimization considering penetration reactive power is presented in this paper. The estimation of the penetration
reactive power is proposed in the paper. The optimization
scheme can minimize the penetration reactive power of the
UHV transmission and hence the voltage stability margin of
the whole power system with UHV transmission. And the optimization is solved based on improved differential evolution
algorithm. An example of Huadong power grid is discussed
and analyzed. And it’s proved that the present optimization
control is effective and practical.
TuA06.8
Optimized W ind and Water Combined Curtailment Strategy for Peak Regulation of Power
System
pp. 654-658
Guodong Liao
Boyuan Wei
Southwest Jiaotong Univ.
Southwest Jiaotong Univ.
Southwest Jiaotong Univ.
Southwest Jiaotong Univ.
Southwest Jiaotong Univ.
State Grid Hunan Electric Power Corporation
State Grid Hunan Electric Power Corporation
State Grid Hunan Electric Power Corporation
Southwest Jiaotong Univ.
31
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
TuA06.10
TuA06.12
Reactive Power Optimization in Smart Distribution Network under Power Market
pp. 663-666
A New Relaxation Method to Obtain Reactive
Power Allocation in Regional Power Grid
pp. 673-677
Kunpeng Zhou
Haixia Tang
Tian Liu
Feng Xiong
Lei Wang
Qi Yin
Jian Zhang
Rui Ding
Jiao Ming
Junyong Liu
Xiaodong Shen
Lixiong Xu
Yanlin Guo
Hubei Electric Power Research Inst.
Suizhou Power Supply Company
Suizhou Power Supply Company
Suizhou Power Supply Company
Suizhou Power Supply Company
The basic framework for reactive ancillary services under
power market that views the reactive power as a compensatory
consumption is investigated in this paper. In the given scenarios the Distributed Generators (DGs) are motivated and utilized
as sources of reactive power and optimizing the overall distribution operation which takes into account the costs of reactive
power delivery. The basic framework for reactive ancillary
services under power market that views the reactive power as a
compensatory consumption is investigated in this paper. In the
given scenarios the Distributed Generators (DGs) are motivated and utilized as sources of reactive power and optimizing
the overall distribution operation which takes into account the
costs of reactive power delivery. The case indicated that the
model proposed can reduce the loss of the lines and the cost of
reactive power and improve the voltage profile in distribution
network.
State Grid DeYang Power Supply Company
State Grid DeYang Power Supply Company
State Grid DeYang Power Supply Company
State Grid DeYang Power Supply Company
Sichuan Univ.
Sichuan Univ.
Sichuan Univ.
Sichuan Univ.
This paper analyzes the problem of reactive power optimization (RPO) in regional power system thoroughly. Successively,
we further discuss the problem caused by the mismatch of the
configuration of reactive power compensation and the demand
of the system. Eventually an extreme optimal power flow
method (EOPF) is proposed to verify the validity of the existing reactive power compensation. By relaxing the control variables including the range of transformer taps and the capacity
of capacitors, the proposed method enlarges the convergence
region of the optimization algorithm and further provides the
advice of optimal allocation of reactive power compensators
for departments of system planning and operation. Case study
on a regional power grid with load uncertainty in Sichuan
Province, China demonstrates the effectiveness of the proposed
EOPF method.
TuA06.11
TuA06.13
Optimal Operation of Complicated Distribution
Networks
pp. 667-672
Lanxiang Wang
Changnian Lin
Yukai Li
Hong Zhang
Beijing Kedong Electric Power
tem Co., LTD
Beijing Kedong Electric Power
tem Co., LTD
Beijing Kedong Electric Power
tem Co., LTD
Beijing Kedong Electric Power
tem Co., LTD
Day-ahead Generation Scheduling W ith W ind
Power Based on the Coordination of Source and
Load
pp. 678-682
Control SysControl Sys-
Jialong Li
Shouya Kang
Wenmeng Zhao
Jianquan Zhu
Mingbo Liu
Control SysControl Sys-
A new day-ahead generation scheduling with wind power
based on the coordination of source and load is proposed in
this paper. First, the effect of time of use (TOU) pricing on
day-ahead economic scheduling program is analyzed. Secondly,
to consume more wind power in the day-ahead generation
scheduling, the TOU pricing problem is combined with the unit
commitment (UC) problem. The problem of uncertainty of
wind power is also dealt with by scenario method, which
transforms the stochastic optimization problem to a deterministic one effectively. Finally, the proposed method is tested on a
provincial grid. The simulation results indicated that the coordination of source and load can benefit to the consumption of
wind power and consumers. The operation cost of power system is also decreases significantly.
Economic operation of complicated distribution network is an
important problem. A bilevel optimal operation model of complicated distribution networks with microgrids integration is
built. In the model, the day-ahead optimal operation of complicated distribution networks is on the upper-level and the
optimal operation of the microgrid is on the lowerlevel. Electricity exchange price constraints are considered in this model.
Further, in order to overcome negative influences brought by
the volatility of renewable distributed generators, electric vehicles are adopted to balance the volatility. The proposed bilevel optimal operation model is solved by particles swarm
optimization based on bilevel iterative algorithm (BIAPSO).
The demonstration is performed on a modified IEEE 33-node
radial distribution network with microgird integration.
November 26-29，2015 Changsha，China
Guangdong power grid control center
South China Univ. of Tech.
South China Univ. of Tech.
South China Univ. of Tech.
South China Univ. of Tech.
32
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
poses an integrated operation optimization scheduling strategy
considering the photovoltaic-wind-pumped storage hybrid
power, which is based on coordinated operation of wind power
and the pumped storage hydro power station. Through load
shifting performance of pumped storage hydro unit, volatility
of photovoltaic-wind power system can be alleviated. Based on
this, this paper establishes a multi-objective optimization
scheduling model which considers unit generation cost and
pollutant emission. Non-dominated sorting genetic algorithm
(NSGA-II) is adopted to solve the model. Numerical results
show comprehensive optimality of both economic and environmental benefits. The rationality and effectiveness of the
proposed model and algorithm is verified.
TuA06.14
The Research on an Optimal Dispatch Model of
Micro-grid
pp. 683-687
Kexue Liu
Qi Zhang
BoTian
Wenjun Li
Wenhua Xuan
Fuchun Zhang
Junyang Li
Qinhuangdao power supply company
Qinhuangdao power supply company
Qinhuangdao power supply company
Qinhuangdao power supply company
Qinhuangdao power supply company
Qinhuangdao power supply company
Qinhuangdao power supply company
With the gradual development of the micro-grid construction,
the problem of micro-grid optimal dispatch has become the
key of depth application. Based on the operating characteristics of Distributed generation (DG) and load changes, the paper establishes an optimal dispatch model of Micro-grid. The
model is solved by particle swarms optimization. At last the
control strategy of micro-grid island operation and network
operation is developed. The simulations of examples prove the
effectiveness of the model.
TuA06.15
Satisfaction Evaluation of Power Customer
Based on Interval Type-2 Fuzzy Sets
pp. 688-692
Jie Wang
Fan Peng
Changsha Univ. of Science and Tech.
Changsha Univ. of Science and Tech.
Satisfaction evaluation indexes of power customer are given in
this paper according to the characteristics of power supply
quality and customer satisfaction model. Because of the uncertainty of power customer satisfaction, this paper discusses a
method for satisfaction evaluation and improvement model of
power customer. Interval type-2 fuzzy sets and fuzzy comprehensive evaluation method are used to analyze and evaluate
power customer satisfaction and related indexes. Improvement
objectives are set and improvement measures are determined.
In addition, the feasibility and effectiveness of this method is
validated by an example.
TuA06.16
Multi-Objective Optimal Scheduling of Power
System Considering the Coordinated Operation
of Photovoltaic-W ind-Pumped Storage Hybrid
Power
pp. 693-698
Rui Ma
Xuan Li
Zhaoyu Wu
Qiang Zhang
Changsha Univ. of Science and Tech.
Changsha Univ. of Science and Tech.
Changsha Univ. of Science and Tech.
State Grid Linyi Power Company
In order to improve the utilization of photovoltaicwind power
system and reduce wind power curtailment, this paper pro-
33
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
With the development of science and technology, the security
of power system is facing great challenge, and it is necessary to
implement the analysis of electricity behavior characteristics
based on big data technology. Today, in the big data environment of the smart grid, it is generally to analyze the performance from a single aspect of power grid, this analysis method
lack of theoretical modeling of the system. In this paper, a load
characteristic analysis and demand response assistant decision
analyzer based on large data technology is proposed, which
consists of three levels: data preprocessing layer, electricity
behavior analysis layer, advanced application layer. The simulation of MATLAB is carried out to verify the feasibility of the
method, which can provide the theoretical support for the operation of the power system.
B: Power System Analysis, Protection
and Control
TuB01.1
Power Equipment Reliability Evaluation Based
on Data Mining
pp. 699-703
Sipeng Hao
School of electrical power engineering Nanjing
Inst. of technology
Jitao Zhang School of electrical power engineering Nanjing Inst.
of technology
Shaofan Liu School of electrical power engineering Nanjing Inst.
of technology
Dong Wang School of electrical power engineering Nanjing Inst.
of technology
Can Huang School of electrical power engineering Nanjing Inst.
of technology
TuB01.3
Multi-objective Optimal Configuration for Traveling Wave Acquisition Unit in Distribution
Network
pp. 712-716
Electrical power equipment reliability is the basis of the stability operation of distribution network. Equipment reliability
includes inherent reliability and operational reliability. Inherent reliability focus on familial defects. Operational reliability
focus on meteorological, load rate and others. This paper
evaluates power equipment reliability based on integration
platform of Jiangsu province electric power company. The
inherent reliability and operational reliability are researched
separately. The quantitative relationship between fault and
condition is researched based on data mining. Weighting coefficients is calculated to combine different factors. On this basis,
the reliability evaluation model is constructed and develop the
relative software. Operation shows that power equipment reliability evaluation system has engineer applicability and practicality.
Feng Deng
Changsha University of Science and Technology
Ke Zheng
Changsha University of Science and Technology
Xiangjun Zeng Changsha University of Science and Technology
Lan Yang
Changsha University of Science and Technology
Donghong Zhao
China Wuzhou Engineering Group Co.
According to the topology characteristic of distribution network, traveling wave acquisition units(TWU) installed at all
the terminals of branch must be greatly increase one-off investment. Thus, an multi-objective optimal configuration
method for TWU in distribution network was proposed in the
paper. Firstly, based on the topology structure of complicated
distribution network, initial configuration scheme was presented. And then network fully observability was analyzed. A
mathematical model was built by considering network fully
observability, and maximal number of TWU. Binary particle
swarm optimization(BPSO) was proposed to solve the multi-objective optimization problem. MATLAB simulation results
show that the optimal configuration method can be rapidly
achieved by synthetically evaluated, which can greatly decrease one-off investment and guarantee fault location accuracy and reliability, which has greatly practical engineering significance.
TuB01.2
Assistant Analyzer for the Characteristics of
Electricity Behavior Based on Big Data Technology
pp. 704-711
Dong Zhu
Jiangsu Provincial Key Laboratory of Smart Grid
Technology & Equipment
Ciwei Gao Jiangsu Provincial Key Laboratory of Smart Grid
Technology & Equipment
Southeast University Chengxian College Southeast
University
Tingting Lu
Jiangsu Provincial Key Laboratory of Smart Grid
Technology & Equipment
Fuchao Liu
Electrical Power Research Inst. State Grid Gansu
Power Company
Yongjun Han Electrical Power Research Inst. State Grid Gansu
Power Company
Jianhua Zhang Electrical Power Research Inst. State Grid Gansu
Power Company
November 26-29，2015 Changsha，China
TuB02.1
Online Calculating Method of Switchgear Circuit
Resistance for 3/2 W iring Connection Substation
Based on Optimal Planning Model
pp. 717-721
Yang Hou
Jing Bu
Minghui Yi
34
School of Automation Nanjing Univ. of Science
and Technology
School of Automation Nanjing Univ. of Science
and Technology
School of Automation Nanjing Univ. of Science
and Technology
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Aiming at the online calculation problem of the switchgear
circuit resistance in 3/2 wiring connection substation and phase
difference of the current through each switch, this paper proposed a kind of online calculation method based on optimal
planning model. The optimal planning model is established on
basis of the current through the switch and the circuit resistance, therefore the complex calculation problem of switch
resistance is transformed into solving optimal planning model.
Using genetic algorithm can avoid the complexity which
brought by the conventional method to solve the problem of
multidimensional space planning during the process of calculation. In the end, it proved the effectiveness of the proposed
method through carrying out simulated operation based on the
data from 500 kV substation using 3/2 wiring connection mode.
Compared with the equation model, the optimal planning
model is more accurate and the calculated result is closer to the
actual value.
out to get the power network model which is used to calculate
the indicatrix on reliability of power system. The proposed
method achieves a more realistic simulation of power system
operation process and improves the accuracy of reliability assessment. Test on RBTS-BUS6 system proves that the method
is correct and effective. Using this method in power grid reliability sensitivity analysis, the reliability sensitivity of primary
equipments can be evaluated and compared directly to satisfy
the demand for maintenance strategy better.
TuB02.4
Analysis of Influencing Factors of Short Circuit
Ratio of Multi-Infeed AC/DC Power Systems
pp. 732-734
Weifang Lin
TuB02.2
Yong Tang
Adaptive DFT Algorithm for Measuring Synchrophasors Based on Shifting W indow Symmetrical
pp. 722-726
Shiming Liu
Tao Guo
Jianhui Li
Jukun Wu
Power System Department China Electrical Power
Research Inst.
China Electrical Power Research Inst.
With the development of power grid in China, multi-infeed HV
AC/DC systems are embedded into South China power grid
and East China power grid. Multi-infeed short circuit ratio
(MSCR) can simultaneously reflect the strength degree of
HVAC systems and interaction among HVDC systems, so it is
an important reference index in the construction of multi-infeed HVDC power system. The factors influencing MSCR
are analyzed in depth theoretically, the influences of such factors as the electrical distance between the positions where
HVDC lines connect into HVAC system, namely the mutual
impedance, and network structure including network topology,
line impedance, distribution of power sources on MSCR are
analyzed; the variation law of MSCR is given. The conclusions
are verified by calculation results of an HV AC/DC hybrid grid
containing two multi-infeed HVDC systems.
Shandong University
Shandong University
Shandong University
Shandong University
In order to improve the measurement accuracy of synchronized phasor in the case of frequency offset, an adaptive DFT
algorithm based on shifting window symmetrical was presented. First of all, sampling window length of DFT is determined
by tracking the frequency of the power grid. Secondly, the
composed phasor is calculated by utilizing three sampling
windows which were away from a quarter sampling window
length to each other. After compensating the fixed offset, the
precise phasor measurement results can be computed. In addition, in order to quickly and accurately track the frequency, a
zero-crossing algorithm based on three-phase signal for measuring frequency was proposed. The simulation results show
that the proposed algorithm can meet the accuracy of synchronized phasor measurement, significantly decreases the computational complexity over the conventional method, and satisfies
the requirements of real time applications for the smart grid.
TuB02.5
Efficient Computation Model of du/dt for Travelling Wave Protections on HVDC Transmission
Lines
pp. 735-739
Dehui Zeng
Jingmei Guo
TuB02.3
School of Electric Power South China Univ.
of Technology
School of Electric Power South China Univ.
of Technology
Du/dt is one of the most important features for voltage travelling waves on occurrence of a dc-line fault, and it is often used
to construct an action criterion for Travelling Wave Protection
on HVDC transmission lines. In order to alleviate the sharp
contradiction between the accuracy and efficiency in obtaining
the trend of dt du/ by traditional simulations, this paper
proposed a global-sensitivity-based efficient computation
method. The global-sensitivity concept is proposed and derived
first, then the detailed implementation scheme, which is based
on Vector Fitting Method (VF) and Thiele-type continued fraction interpolation technique, is presented. Finally, numerical
examples show that the high computation accuracy can be
achieved, at the same time, the proposed method has a huge
advantage in saving CPU time to obtain the trend of du/dt over
traditional simulations.
Reliability Assessment of Power System Based
on Topology Logic Relation
pp. 727-731
Ying Ding
State Grid of China Technology Coll.
Chao Li
Shandong electric power maintenance company
Yao Jin
Shandong power economic and technological inst.
Shuguang Qi
Shandong electric power technology co., LTD
A method for power system reliability evaluation based on
topology logic relation is presented. Firstly, topology logic
analysis for substation is made to get equivalent nodes and the
connectedness, then system topology logic analysis is carried
35
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
variable—system frequency is added. And the loss is no longer
undertook by balancing generator only but by all generators
having speed controllers. In addition, this paper also considers
the contingency set of power system by calculating the probability of each contingency happening and then obtaining the
PDLF of each contingency. Thus, the overall PDLF considering
contingency set can be obtained by combining the full probability theory and PDLF based on cumulants. The algorithm
can provide valuable information for power system planning,
reliability analysis and static security risk assessment.
TuB02.6
A Research of D-FSC Technology for Improving
Voltage Quality in Distribution Networks
pp. 740-745
Yuanfang Zeng
Huazhong Univ. of Science and Technology
Buhan Zhang
Huazhong Univ. of Science and Technology
Mei Li
Huazhong Univ. of Science and Technology
Pei Bie
Huazhong Univ. of Science and Technology
Hang Li
Huazhong Univ. of Science and Technology
Tuo Guo State Grid Hubei Electric Power Company Yunxian
Power Supply Company
Gang Yu State Grid Hubei Electric Power Company Yunxian
Power Supply Company
Xia Tu State Grid Hubei Electric Power Company Yunxian Power
Supply Company
TuB02.8
Energy Theft Detection via Integrated Distribution State Estimation Based on AMI and SCADA
Measurements
pp. 751-756
The series capacitor can improve the transmission capacity
and voltage stability effectively. The fixed series capacitor
(FSC) applied to the distribution networks can improve the
voltage quality and reduce the system losses. This paper presents the analysis methods of D-FSC used to regulate the distribution network voltage. For a typical radial 110kV high
voltage distribution grid, we selected the compensation position and calculated the compensation capacity of single-point
and multi-point compensation methods, then do the research of
the relationship between the compensation capacity and compensation effects. In the scheme proposed, the D-FSC can effectively improve the voltage quality and reduce system losses.
Wenpeng Luan
Guan Wang
Yixin Yu
Jiaying Lin
Weixin Zhang
Qing Liu
Energy theft has been a serious and long existing problem facing by many power utilities. The implementation of Advanced
Metering Infrastructure (AMI) provides power companies
with new means for energy theft detection. As fundamental
equipment of AMI, smart meters collect interval measurements from customer sites and thus provide system wide visibility for power companies. Leveraging both AMI and SCADA
measurements, this paper puts forward an integrated distribution state estimation method for medium-voltage and
low-voltage distribution network. Numerical studies show that
the proposed approach can achieve a higher accuracy level for
estimation. Furthermore, an energy theft detection method is
proposed based on “weight-dropped polling” integrated distribution state estimation. Simulations show that it can deliver
promising results comparing with conventional state estimation methods.
TuB02.7
Probabilistic Dynamic Load Flow Algorithm Considering Static Security Risk of the Power System
pp. 746-750
Pei Bie
Buhan Zhang
Hang Li
Yuanfang Zeng
Mei Li
Shuang Zhao
Jiasi Wu
Guojun Lu
Yong Wang
Guoyan Chen
Huazhong Univ. of Science and Technology
Huazhong Univ. of Science and Technology
Huazhong Univ. of Science and Technology
Huazhong Univ. of Science and Technology
Huazhong Univ. of Science and Technology
Huazhong Univ. of Science and Technology
Huazhong Univ. of Science and Technology
Guangzhou Power Supply Co., Ltd
Guangzhou Power Supply Co., Ltd
Guangzhou Power Supply Co., Ltd
TuB02.9
A Lower Sideband EMD and Its Application in
Power Systems
pp. 757-764
Chengxin Li
School of Electrical Engineering and Information
Sichuan Univ.
Junyong Liu School of Electrical Engineering and Information
Sichuan Univ.
Zhaoyang Dong
School of Electrical and Information
Engineering Univ. of Sydney
Guo Chen
School of Electrical and Information
Engineering Univ. of Sydney
Nowadays, the stable and secure operation of power system
has attach more and more attention. The traditional static security analysis is based on deterministic load flow, which cannot reflect the uncertainty of load and the probability of
branch outage. In addition, the conventional load flow model
does not consider the static power-frequency characteristic of
generators and load, which is not in accordance with the real
operating condition of power system. In order to provide comprehensive static security risk assessment for the power system,
so that the potential dangerous and vulnerable part of power
system can be recognized before serious outage happens, a
Probabilistic Dynamic Load Flow considering Static Security
Risk (PDLF-SSR) algorithm is proposed, in which a new state
November 26-29，2015 Changsha，China
China Electric Power Research Inst.
Tianjin University
Tianjin University
Tianjin University
Tianjin Electric Power Research Inst.
Tianjin Electric Power Research Inst.
Low frequency oscillation assessment methods based on measured data have attracted increasing attention from research
and industry stakeholders in power systems engineering.
Among those existing methods, empirical mode decomposition
(EMD) is a multi-resolution signal processing method used for
36
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Xiaojun Tang
Hongmei Luo
Jinghua Jia
analysis of non-stationary signals. In recent years, EMD has
been a most widely used method in practice. However, it has
some disadvantages such as end effect, mode mixing, etc. If a
signal contains more than two individual components whose
frequencies fall within an octave, it cannot be decomposed by
standard and the frequency heterodyne EMD methods. To
improve the frequency resolution, a lower sideband frequency
shift EMD (LSB-EMD) is proposed in this paper. The method
includes an advanced approach on how to select an appropriate modulation frequency so as to can enlarge the component
frequency ratios and avoid frequencies turn over. The improved frequency shift EMD is integrated with the procedure
of the standard EMD. Consequently, the complex signal can be
decomposed by the method. This method can be applied for the
analysis of lowfrequency oscillations, as well as other power-system signals such as power quality signals and inrush
currents. The effectiveness of the method to separate closely
spaced modal components is demonstrated by both numerical
simulation and field measurements.
Lun Cheng
The probability of power system cascading failure is very small,
but once happened, its influence is disastrous. There are a few
key branches play an important role in the process of cascading failures in power system. The identification of these key
branches is of great significance to the safe and stable operation of power system. Power system transmits active power and
reactive power at the same time. Different from the full range
of active power, the reactive power has the characteristic of
regional decoupling. The impact is generally limited in the
vicinity of fault branch, so this paper temporarily only considers active power. Firstly, in this paper, the only link line between two subsystems is detected. If the branch is the only link
line, it is the key branch. If it is not, then make the power flow
of the fault branch as the basic parameters, and reduce the
active power flow in the relevant branch of the fault branch to
the fault branch by the power grid topology. Then get the grid
key branch identification evaluation indicator. Finally apply
the evaluation indicator in practical example of IEEE 39 bus
system, and the result conform to the actual operation characteristics of IEEE 39 bus system and prove the correctness and
effectiveness of the method.
TuB02.10
Temperature-Dependent Optimal Power Flow
Based on Simplified Interior Point Method
pp. 765-769
Qin Gao
Zhinong Wei
Guoqiang Sun
Yonghui Sun
Haixiang Zang
Coll. of Energy and Electrical Engineering Hohai Univ.
Coll. of Energy and Electrical Engineering
Hohai Univ.
Coll. of Energy and Electrical Engineering
Hohai Univ.
Coll. of Energy and Electrical Engineering
Hohai Univ.
Coll. of Energy and Electrical Engineering
Hohai Univ.
TuB02.12
Reactive Power Optimization Algorithm Containing Discrete Variables Based on Sensitivity
Information
pp. 775-780
In this paper, a novel temperature-dependent optimal power
flow (TDOPF) is proposed to improve conventional optimal
power flow (OPF). In conventional OPF, the resistance of
branches is assumed to be constant and temperature effects on
line resistance has been neglected, which will result in a great
deviation with actual operation situation. Based on the weak
coupling property of electrical and thermal variables, the decoupled TDOPF is proposed to improve the efficiency of
TDOPF algorithm. All the OPF algorithms are sufficiently
solved by a novel simplified primal-dual interior point method.
Finally, it is shown by the numerical simulation results that the
proposed TDOPF and its decoupling algorithm are available
and effective.
Wenbo Li
Shandong Electric Power Research Inst.
Zhe Jiang
Shandong Electric Power Research Inst.
Dandan Zhang
Shandong Electric Power Research Inst.
Si Yang
State Grid Shandong Electric Power Company
Xin Su
State Grid Shandong Electric Power Co.l Jinan Power
Chao Zhang Shandong Zhongshi Yitong Group Corporation Ltd
To solve the difficulties in the calculation of reactive power
optimization caused by discrete variables, a reactive power
optimization algorithm based on the in-depth analysis of the
mathematical model of reactive power optimization and the
solving principle of prima-dual interior point method is proposed, which makes the most of the sensitivity information of
discrete variables. The algorithm makes full use of the optimization information embodied by the sensitivity, and adopts the
approach of successively structuring discrete variables to improve the reliability of the sensitivity information and the feasibility of the optimal solution, with less calculation and easier
operation. Finally, the rationality and effectiveness of the proposed method are verified by the analysis of examples.
TuB02.11
Complex Network Theory Based Recognition of
Power Grid Key Line
pp. 770-774
Rui Liu
Jiancheng Zhang
Zhe Dong
Yi-qiang Li
China Electric Power Research Inst.
China Electric Power Research Inst.
Hebei Electric Power Corporation State Grid
Corporation of China
Hebei Electric Power Corporation State Grid
Corporation of China
North China Electric Power Univ.
North China Electric Power Univ.
North China Electric Power Univ.
North China Electric Power Univ.
37
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Qianying Mou
Shandong University
Changgang Li
Shandong University
Liang Wang
State Grid Shandong Electric Power Company
Bing Zhang
State Grid Shandong Electric Power Company
TuB02.13
Reduced Order Modeling for Load Aggregation
based on Empirical Covariance Matrices
pp. 781-786
Gang Zhang
Zhengchun Du
Chongtao Li
Yu Ni
The accuracy of transformer parameters is critical for power
system analysis and control decision. In practice, the parameters of a transformer may deviate from its factory values due
to the influence of environment and equipment aging. An improved model is presented in this paper to identify transformer
parameters based on WAMS and SCADA data. Relative errors
are considered in the objective function. Cases with different
objective functions are examined. The accuracy and convergence of the different method are compared.
Xi’an Jiaotong Univ.
Xi’an Jiaotong Univ.
Xi’an Jiaotong Univ.
Xi’an Jiaotong Univ.
Load model contributes a lot in power system stability analysis.
Induction motors aggregation is one of the most important
parts in load modeling. This paper presents a new method for
aggregating induction motors based on nonlinear model reduction. Firstly, the induction motors were seen as a nonlinear
input-output system with bus voltage as input and equivalent
impedance as output. Secondly, nonlinear model reduction
technique was applied on the system to calculate the empirical
covariance and transformation matrix of the system. Then the
reduced-order system was obtained by performing Galerkin
projection on the original system. Lastly, an adaptive genetic
algorithm was used to get more accurate result. Simulations
and analysis were carried out in IEEE 39-bus system. The simulation results show that the new method could attain high
accuracy to simulate all the individual induction motors under
different operating states and improve the precision of simulation.
TuB02.16
Distribution Network Energy Loss Calculation
Method Considering W ind Power Integration
pp. 797-801
Jiasi Wu
Huazhong University of Science and Technology
Mei Li
Huazhong University of Science and Technology
Bu-han Zhang Huazhong University of Science and Technology
Bo Ruan
State Grid Hubei Economic Research Inst.
Dehua Yu
State Grid Hubei Electric Power Company
Grid energy loss is one of the key factors affecting the economic operation of power systems. Accurate calculation of electric
energy consumption, will have a great positive effect on the
planning, operation and management of all aspects of the grid.
Due to the randomness of wind power resources, wind power is
likely to increase access or may reduce power system losses.
Therefore, study on grid energy loss calculation method containing wind integration has very important practical significance. Currently there are many grid theoretical line loss calculation method, but these methods have some limitation such
as, less considering the load curve changes. This paper presents
an improved method of equivalent power to calculate energy
loss of wind power integration, through considering the impact
of the load curve, and the random fluctuations of wind power,
making use of load shape coefficient to correct the average
power, computing power flow calculation by using equivalent
power, calculate the energy loss more accurately.
TuB02.14
A Risk Assessment Method for Cascading Failure
Caused by Electric Cyber-Physical System (ECPS)
pp. 787-791
Ting Zhao
Dong Wang
Dongxu Lu
Yuan Zeng
Yanli Liu
State Grid Smart Grid Inst.
Tianjin University
Tianjin University
Tianjin University
Tianjin University
This paper presents a new risk assessment method for cascading failure caused by electric cyber-physical system (ECPS).
The development of a trustworthy smart grid requires a deeper and more specific analysis of potential impacts resulting
from failures of ECPS. A probability model is presented to
calculate the reliability of ECPS which controls the security
and stability control system. Cascading failure due to failures
of ECPS is being investigated by risk assessment method in
this paper. Two scenes including signal lost and signal transmission error which may lead to cascading failure in power
system is considered. IEEE 118-bus system is used as a test
system and the simulation results verifies the effectiveness of
proposed failure model and risk assessment method.
TuB02.17
A Quantitative Evaluation Method for Dynamic
Equivalence Based on Prony Algorithm
pp. 802-806
Lin Zhu
Qiliang Sheng
Ping Liu
TuB02.15
An Improved Method of Transformer Parameter
Identification Based on Measurement Data
pp. 792-796
Yaping Zhang
Hengxu Zhang
A quantitative evaluation method for dynamic equivalence in
power System using prony algorithm is presented, and an
equivalence error index calculated by the prony analysis result
of transient response in original and equivalent system is defined to quantitatively describe the accuracy of dynamic
equivalence. Before that, a practical method to aggregate gen-
Shandong University
Shandong University
November 26-29，2015 Changsha，China
South China University of Technology
South China University of Technology
South China University of Technology
38
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
erators which involves selecting the largest capacity one as the
dominant generator of a group and modifying the reactance
parameters using single variable optimization is presented to
prove the effectiveness of proposed quantitative evaluation
method on account of the apparent difference before and after
modifying. Choosing IEEE39 power system as the original
system to be reduced, transient simulation results verify the
accuracy and reliability of the quantitative evaluation method
proposed in this paper.
that mainly affect system stability are given using the fuzzy
comprehensive evaluation. Finally, the optimal scheme can be
determined from maximum priority. The rapidity of the proposed method is verified by the simulation of short-circuit
current exceeding limit of 220 kV buses of Area Power Grid.
TuB02.20
The Disturbance Propagation Model of Power
Grid Considering Induction-Motor Load
pp. 817-821
TuB02.18
A Power Flow Algorithm for Distribution Networks Based on the Equivalent Nodal Injection-current Transformation
pp. 807-812
Yuehao Yan
Wei Bao
Di Su
Yang Zuo
Lu Xin
Xiong Yang
Jiangsu Electric Power Company Research Inst.
Qiang Li
Jiangsu Electric Power Company Research Inst.
Xiaodong Yuan Jiangsu Electric Power Company Research Inst.
Zhinong Wei
Hohai Univ.
Guoqiang Sun
Hohai Univ.
With the development of power grid interconnection, once a
disturbance occurs, the propagation of the disturbance take
form of electromehcanical waves. Therefore, the reveal of disturbance propagation mechanism is of great importance for
the power system security. In this paper, the electromechanical
transient process of induction-motor load is taken into consideration for the model of power grid in the electromechanical
wave study. The consistence between generator and induction-motor load during disturbance propagation is proved.
Then, the structural frame model of power networks considering induction-motor load for disturbance propagation is
proposed based on structural frame model. Furthermore, the
propagation equation of electromechanical wave in the basic
unit of the proposed model is derived. Simulation results in
IEEE 14 buses system are given to show the validity of the
proposed model.
A distribution network power flow algorithm based on the
equivalent nodal injection-current transformation is presented.
According to the basic principles of the traditional Newton-Raphson method, the nonlinear power flow equations of
the PQ nodes are converted into the linear equations by using
the equivalent nodal injection-current transformation. It simplifies the Jacobian matrix of the iterative formula, and most
of its elements are constant. The nonzero elements of the Jacobian matrix are calculated by making full use of the sparse
technique, it greatly saves the memory space, and improves the
calculating speed and efficiency of the proposed algorithm.
Finally, the simulation results verify that the proposed algorithm is effective and successful, and has better calculating
speed and efficiency, stable convergence, and strong ability of
processing loops.
TuB02.21
Unbalanced Three-Phase Distribution System
Power Flow with Distributed Generation using
Affine Arithmetic
pp. 822-829
TuB02.19
Research on Optimal Scheme of Decreasing
Short Circuit Level for Local Power Network
pp. 813-816
Guanglei Li
Chunlin Wang
Xianzhen Zeng
Yuyao Qu
Shuai Yuan
Deshun Han
State Grid Zhengzhou Power Supply Company
State Grid Zhengzhou Power Supply Company
State Grid Zhengzhou Power Supply Company
State Grid Zhengzhou Power Supply Company
Zhengzhou Xinli Electric Power Co.,Ltd.
Feng Xue
Weilun Xie
Peicheng Xie
Zhengning Pan
Jiayi Ren
Yinghui Nie
Xuchong Wang
Ming Chen
Shandong Electric Power Research Inst.
State Grid Linyi Power Supply Company
State Grid Heze Power Supply Company
State Grid Dongying Power Supply Company
State Grid Shandong Power Supply Company
State Grid Shandong Power Supply Company
Guangdong Power Grid Company Limited
Guangdong Power Grid Company Limited
Guangdong Power Grid Company Limited
Southeast University
Southeast University
Southeast University
Southeast University
Southeast University
Due to the high penetration of the uncertain distributed generations (DGs), including wind power generators (WTG), photovoltaic (PV) power generation and plug-in hybrid electric
vehicle (PHEV), the power flow of the distribution system has
become asymmetry and uncertain. Based on the combination
of interval and affine arithmetic, this paper establishes the
model of three-phase load with uncertain DGs, and proposes a
threephase forward-backward sweep power flow algorithm for
the distribution system. Compared with the deterministic
Since breaking transmission lines has thousands of combinations for large power grid, it's difficult to find the best combination to decrease short circuit level in a short time. Sensitivity
relationship between transmission line outage and impedance
change is aquatinted firstly in this paper, then preliminary
combination schemes of transmission line outage is selected
according to the sensitivity. Index values of factors including
constraint condition, power supply reliability and other factors
39
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
power flow, the proposed algorithm can not only analyze the
impact of the uncertain load and DGs on the power flow, but
also reduce the overestimation of bounds yielded by correlation
of variables in interval arithmetic (IA). IEEE 33-bus test
systems are used to analyze the influence of the penetration of
distributed generations on the distribution system.
ployed in numerical experiments to demonstrate the effectiveness of the proposed method. The results indicate that the
proposed SADMM-based algorithm possesses a high computational efficiency and accuracy, and applies to large-scale power
system problems.
TuB02.24
TuB02.22
Distribution System Fast Decoupled State Estimation Based on Complex pu Normalization
pp. 840-845
Study on the T ime Variability of Load Characteristics based on Markov Chain Monte Carlo Simulation
pp. 830-834
Zhinong Wei
Xing Chen
Guoqiang Sun
Haixiang Zang
Guangyao Zhou
Shandong Univ.
Zhenshu Wang
Shandong Univ.
Xueli Wang
Shandong Electric Power Maintenance Company
Considering the high R/X ratios on distribution systems, the
conventional fast decoupled state estimation (FDSE) algorithm
can-not be applied to emerging distribution systems. To improve the performance of FDSE methods, this paper proposes
the complex per unit (cpu) normalization method. The cpu
concept is aimed to overcome the numerical problems raised
by the high R/X ratios of distribution systems. Results and
comparative analysis have been presented and illustrated using
the 33-bus distribution test systems.
The accurate degree of the load model in the whole time period
has important influence on the decision of the system and the
stability of the system. But the load is time-varying. Current
algorithms can identify the load model with certain accuracy
at the time points when the voltage is instable. In the moment
with stable voltage, due to the difficulty of identifying the load
model, they use a constant load model. This paper tries to find
out the regularity of the time variation and solve the problem
of the uncertainty of the load, and then put forward the corresponding method.
TuB03.1
Zero-Sequence Voltages of UHV Untransposed
Double-Circuit Lines and Their Influence on Pilot
Protection
pp. 846-851
TuB02.23
Solution of Optimal Power Flow Problems by
Operator Splitting Method
pp. 835-839
Wuneng Ling
Tingting Wang
Naishan Hang
Deshui Chen
Jinglong Dai
Huiqin Liao
Bin Li
Zhongqing Li
Dingxiang Du
Xianguo Jiang
Guangxi University
Guangxi University
Guangxi University
Guangxi University
Guangxi University
Tianjin University
Tianjin University
China Electric Power Research Inst.
China Electric Power Research Inst.
China Electric Power Research Inst.
For untransposed double-circuit transmission lines on the
same tower, there are zero-sequence voltages exerting on both
ends of double-circuit transmission lines under normal operation and external phase-to-phase fault conditions. The amplitude and phase of the zero-sequence voltages are affected by
wire parameters, wire orientations, the types of external phase
to phase fault and system parameters. The zero sequence voltage may reach threshold value of zero-sequence power direction component, causing zero sequence power direction component maloperation with high zero sequence current. This
paper analyzes the cause of zero-sequence voltages and their
influence on pilot protection. Theoretical analysis and simulation results prove that system zero sequence impedance has
influence on zero sequence voltage and zero sequence current.
This paper will has great meaning to fault analysis of double-circuit transmission lines and protection configuration.
In recent years, interior point method combined with linear
conic programming (LCP) has become a hot topic of solving
optimal power flow (OPF) problem in power system. However,
interior point method has been proved to be inefficient for a
large-scale LCP problem as it can’t take advantage of the
sparse characteristics in the original data matrix while solving
the Schur complement equation. To this end, an operator splitting method, simplified alternating direction method of multipliers (SADMM) which is high-efficiency of solving LCP problems, is presented in this paper. In order to acquire the solvable
form of SADMM, based on semidefinite-quadraticlinear programming (SQLP), the original OPF problem is transformed
into an intermediate model called SQLP-OPF which consists of
two semidefinite matrix variables and a non-negative conic
variable. After forming the constraint coefficient matrix and
the objective function coefficient of SADMM through the dual
problem of SQLP-OPF, the solvable SADMM-based OPF
could be formed. Four IEEE benchmark systems (IEEE 30, 57,
118, 300) and a 703 buses power system from Asia are em-
November 26-29，2015 Changsha，China
Hohai Univ.
Hohai Univ.
Hohai Univ.
Hohai Univ.
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
TuB03.2
TuB03.4
The Structure for the Fault Diagnosis System
Aided for the Power System Operating
pp. 852-857
Assessing the Aging Status of the Silicone Rubber Insulator using Unilateral NMR Technology
pp. 864-868
Bin Li
State Grid Jiangsu Electric Power Research Inst.
Yajuan Guo State Grid Jiangsu Electric Power Research Inst.
Jinming Chen State Grid Jiangsu Electric Power Research Inst.
Haibin Zhu
State Grid Jiangsu Electric Power Company
Xiaoyi Zhang State Grid Jiangsu Electric Power Research Inst.
Liping Ye
Jianhua Lin
Yunfeng Xia
Huagan Chen
Haikun Wei
Kaikai Meng
Jiamin Wu
Xianjun Cui
Traditional strategy about the fault diagnosis always puts all
thoughts on the identification of the fault location and its accuracy. Few systems associate the fault with the cause of fault
occurring. This paper presents a structure of the fault diagnosis system aided for the power system operating, which diagnoses whether the lightning strokes the fault or the surrounding circumstances affect the grid operation. The system structure not only has extensibility for the intelligent algorithms,
but also meets the requirements of information security. Validation demonstrates that the system with the environment
monitoring is effective for the fault diagnosis and analysis.
The aging of silicone rubber insulator threatens the safety of
the power grid. An accurate estimation of the insulator aging
status is necessary for taking precautions against insulation
failure. In this study, we propose a novel unilateral nuclear
magnetic resonance (NMR) method to quantify insulator degradation attributed to aging. The CPMG sequence was employed to record the 1H NMR transverse relaxation curves of
the silicone rubber insulators with different service years. The
decay curves were fitted to the bi-exponential functions. Further data processing of the decay curves was performed with
the inverse Laplace transformation for one dimensional T2
distribution analysis, and the mean life time of the long T2
component (T2long mean) was obtained. The result demonstrates that an increase in the aging level of the insulator
clearly results in a decrease of T2long mean. To compare with
the results of NMR measurement, the relative permittivity of
the insulator was measured. It shows a same changing trend as
that of T2long mean. It indicates that T2long mean relaxation
time obtained from our portable NMR sensor can be used as
an index to reflect the aging status of the silicone rubber insulator.
TuB03.3
A Novel Sufficient Differential Protection For
Distribution Network W ith DGs Based On Fault
Synchronous Information
pp. 858-863
Hanlin Li
Yuping Lu
Guangdong Power Grid Co., LTD
Guangdong Power Grid Co., LTD
Guangdong Power Grid Co., LTD
Guangdong Power Grid Co., LTD
Guangdong Power Grid Co., LTD
Chongqing University
Chongqing University
Chongqing University
Coll. of Electrical Engineering Southeast Univ.
Coll. of Electrical Engineering Southeast Univ.
The differential protection scheme is the most effective way to
solve the protection problem of distribution network with DGs.
Limited to the level of distribution network communication
automation, traditional differential protection scheme can’t be
applied in distribution network with DGs. To solve the problem above, this paper proposes a fault synchronous identification technology. As the moment of fault is the same time for
both ends of line, the technology uses the moment of fault as a
time reference. The measurement about the interval between
the first zero point of fundamental frequency current wave
rising edge (or falling edge) after fault and the moment of fault
will be carried out, and then intervals will be used to calculate
phase change, which can effectively overcome the difficulty of
high precision synchronous sampling. Based on fault synchronous identification technology, this paper proposes sufficient
differential protection compound criterion. Only amplitude of
fundamental current wave and time information after the failure are used to structure braking equation. Besides the sufficient current amplitude comparison criterion is lead up. New
criterion overcomes contradiction between improving phase
shift restraint capacity and sensitivity at the same time. Simulation verified the accuracy of the synchronous identification
technology, the new criterion based on which has good action
features too.
TuB03.5
T ime Synchronization Based on Multiplexing
RPR Channel and IRIG-B T ime Code
pp. 869-872
Haozhi Wang School of Electrical Engineering Shandong Univ.
Guofang Zhu School of Electrical Engineering Shandong Univ.
Meiyi Hou
School of Electrical Engineering Shandong Univ.
Shunpu Wang Shandong Electric Power Company State Grid
For the time synchronization in smart grid, the paper proposes
a solution that transmitting IRIG-B time code by multiplexing
RPR channel. In the method, we multiplex RPR channel, using
the control code in the coding of Ethernet physical layer to
represent the rising and falling edges of the pulse signal, to
transmit IRIG-B message. The RPR nodes are divided into
master nodes and slave nodes. The master nodes are responsible for accessing precise time information and the output of
IRIG-B time code, and slave nodes are responsible for receiving the IRIG-B time code and the output of precise time information calculated by using the recovery algorithm. This
paper offer the design method based on Field Programmable
Gate Array (FPGA), and simulating test is proceeded by the
41
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Modelsim simulation software. The experimental results show
that the synchronization scheme achieves the low cost and high
precision time synchronization, laying a good foundation for
the establishment of wide area measurement and control system in smart grid.
tion. Simulation verification of the proposed method has been
carried out by MATLAB/Simulink, the simulation results indicate that fault in low voltage active distribution network can
be located and recognized accurately by the proposed method
with fast speed and self-adaption.
TuB03.6
TuB03.8
The Novel Cryptographic Key Generation and
Distribution Scheme for Smart Grid
pp. 873-875
Dynamic Pressure Analysis and Protection of
Transformer in Internal Arcing Fault by FEM
pp. 882-887
Zhidong Wang
Piao Liu
Peixia Lin
Zhibin Yang
Mei Liang
Hanmu Zuo
Xian Yang
South China University of Technology
South China University of Technology
South China University of Technology
South China University of Technology
South China University of Technology
South China University of Technology
Jun Guan
Chunyao Lin
Dan Zhou
Chunjun Ke
Secret key generation and distribution is crucial to the information security of smart girds. The paper firstly analyzes the
merit and vulnerable essence of the key distribution scheme
proposed by Xia and Wang. Deliberate analysis reveals the
essential weakness of Xia and Wang’s scheme is the failure of
integrating the initiator’s identity with an explicit authenticated code,
resulting
in possible
tampering
by
man-in-the-middle attacks. Then several improved methods
are proposed according to different security requirements.
These methods keep the high-efficiency of Xia and Wang’s
method while avoiding its impersonation attack weakness.
Whenzhe Chen
Zhiguo Hao
In view of the transformer internal fault would lead to the tank
cracking, fire, explosion and other serious accidents, power
transformers are usually equipped with pressure relief valve
and gas relay. However, due to the lack of theoretical innovation and reliability remain in the existing protections. This
paper proposes a numerical method to research the pressure
behaviors of transformer tank under internal overpressure
caused by the high-energy arcing faults and develops protection principles based on pressure characteristics. According to
the real full-scale 100MVA/110kV oil-immersed transformer
parameters, a transformer model has been set up. Then, the
4.4MJ and 3.1MJ arcing faults have been provoked as the simulation examples by employing 3D FEM. The transient pressure characteristics such as pressure rise curves and effective
pressure indexes at different positions have been studied.
Moreover, this paper develops new protection principles for
heavy gas protection and light gas protection based on pressure characteristics. In addition, both the theoretical model
and the simulation method proposed in this paper can be extended to study tank structure and overpressure in other types
of transformers instead of dangerous and costly tests.
TuB03.7
A Novel Fault Location and Recognition Method
for Low Voltage Active Distribution Network
pp. 876-881
Geng Niu
Long Zhou
Wei Pei
Zhiping Qi
Chinese Academy of Sciences
Chinese Academy of Sciences
Chinese Academy of Sciences
Chinese Academy of Sciences
As more and more DGs plugged into low voltage side of the
distribution network, the low voltage distribution network has
been changed to active distribution network. Bidirectional
power flow and uncertainty of DGs’ output cause the conventional fault location methods to be inapplicable in active distribution network for malfunction and miss trip, which makes
the fault location in low voltage active distribution network an
urgent problem. In order to solve this problem, a novel fault
location and recognition method for low voltage active distribution network which needs 3-phase currents measurement
only is proposed in this paper. In the proposed method, a low
voltage active distribution network is installed with the measurement and data process units for current measurement and
data process at nodes and a control center for fault location
and recognition. By the division of the low voltage active distribution network into several two-terminal sections without
branch, the fault location (inside/outside the section) with
fault-phase selection can be determined by the calculation of A,
B and C phase current phaseangle differences of each section
and the fault type can be identified by judging the amplitudes
of zero-sequence node currents at both ends of every fault sec-
November 26-29，2015 Changsha，China
Electric Power Research Inst of Guangdong
Power Grid Corporation
Xi’an Jiaotong University
Electric Power Research Inst of Guangdong
Power Grid Corporation
Electric Power Research Inst of Guangdong
Power Grid Corporation
Electric Power Research Inst of Guangdong
Power Grid Corporation
Xi’an Jiaotong University
Xi’an Jiaotong University
TuB03.9
Analysis of Pilot Zero-Sequence Directional Protection Mal-function in Double-circuit Lines
Break-conductor Fault and Solutions
pp. 888-893
Wenzhe Chen
Zhiguo Hao
Jun Guan
Baohui Zhang
Dingxiang Du
Xianguo Jiang
Xi’an Jiaotong University
Xi’an Jiaotong University
Xi’an Jiaotong University
Xi’an Jiaotong University
China Electric Power Research Inst
China Electric Power Research Inst
When asymmetric break-conductor faults occur in double-circuit transmission lines, the shift of load may produce
large unbalance current in healthy line, leading to the mal-
42
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
function of pilot zero-sequence directional protection with
voltage compensation. This paper discusses the zero-sequence
character of double-circuit lines in break-conductor fault, presents the mal-function mechanism of pilot zero-sequence directional protection with voltage compensation in healthy line
after singlephase grounding fault tripping. The theoretical
analysis was confirmed through simulation model. Moreover,
preventive measures based on one-end single line or double
lines electrical information was proposed.
matically collect current information of all adjacent substation
interstation lines at other side. By comparing one current
phase with the phase of all other current phasor sum respectively and sorting the difference value, the fault can be located
according to the rank. The algorithm uses the current phase
comparison principle, which can locate the fault quickly and
accurately, the principle is simple and less information is
needed. Finally PSCAD simulation is used to verify the feasibility of the algorithm.
TuB03.10
TuB03.12
A New Concept Intelligent Integrated Protection
System for Distribution Network
pp. 894-898
Hierarchy of Distribution Centralized Substation
Area Protection System Based on All-in-One Devices
pp. 903-906
Zhiqian Bo
Qingping Wang
Yingke Zhao
Lin Wang
Le Chen
Fanrong Wei
XUJI Group
XUJI Group
XUJI Group
XUJI Group
Huazhong University of Science and Tech
Huazhong University of Science and Tech
Lin Wang
Zhiqian Bo
Yingke Zhao
Xiaowei Ma
Mengqi Yu
Fanrong Wei
Smart substation and communication technology have a tremendous development, making the grid to coordinate and optimize a wide range of data possible, thus providing a higher
level of centralization foundation for the protection and control
functions. Therefore, the direction of future’s protection is
based on the high-performance computer technology and advanced communication networks. To this end, this thesis proposes the concept of "Protection Intelligent Center". The center in the distribution network can take over the main functions of protection of several substations. Protection Intelligent
Center of distribution network side aims at high voltage distribution network, bases on the high-speed and reliable communication networks and international standards of the time
synchronization. This paper based on distribution network
Protection Intelligent Center of Liaoning Electric Power Supply CO, LTD. Through integration of panoramic information
of regional power grid, and exploration and practice of centralized protection and control system, which is a bold attempt
for the development of new generation intelligent substation.
With the rapid development of communication technology and
the widely constructing of smart substations, wide-area protection and substation area protection have become hot research
topics. As an important part of network protection, substation
protection at present only realized the centralization of the
information transmission, but the comprehensive utilization of
information has not been an in-depth digging, on the other
hand, protect devices still been placed centralized in the master
control room, the regulation that primary equipment and secondary equipment must be set aside a safe distance results in
the Large occupation of land ，seldom play out the advantages
of information protection which can make the devices highly
integrated and miniaturized. In response to those questions, a
novel distribution centralized substation area protection system based on All-in-One device is proposed in this paper, and
the configuration and function of All-in-One device are also
described in detail. Then introduces the VPN scheme of the
proposed system. On this basis, considering the features of
proposed system structure and networking schemes, this paper
brings out a time-sharing cooperation work strategy. The example proves that the strategy is reasonable and effective,
while shows the superiority of the distribution centralized substation area protection system compared to the traditional
protection system.
TuB03.11
Dealing W ith the Information-missing of the Entire Station by W ide Area Protection Online
Adaptive Technology
pp. 899-902
Yingke Zhao
Zhiqian Bo
Qingping Wang
Xiaowei Ma
Neng Jin
Fanrong Wei
XUJI Group
XUJI Group
XUJI Group
XUJI Group
Huazhong University of Science and Tech
Huazhong University of Science and Tech
TuB03.13
The Protection Cooperation of Distribution
Network Based on Protection Intelligent Center
and the Validation of its Reliability
pp.907-912
XUJI Group
XUJI Group
XUJI Group
XUJI Group
Huazhong University of Science and Tech
Huazhong University of Science and Tech
Zhiqian Bo
Yingke Zhao
Lin Wang
Xiaowei Ma
Suyang Ding
Fanrong Wei
There are more and more studies on centralized protection,
but the effective protection scheme dealing with the information-missing of entire substation is scarce. To solve this
problem, this paper proposes a wide area protection online
adaptive algorithm. When the information of entire substation
is missing and inter-station line fails, the algorithm will auto-
XUJI Group
XUJI Group
XUJI Group
XUJI Group
Huazhong University of Science and Tech
Huazhong University of Science and Tech
With the development of communication technology and arti-
43
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
ficial intelligence, the study of protection intelligent center is
becoming the research focus. To make full use of the technology advance, the concept of protection intelligent center is proposed. The protection intelligent center is a remote center
which can gather the electrical information of the whole network and give out tripping signals on the basis of analysis. In
distribution network, the protection intelligent center could
provide multiple protection with its local layer and center layer.
This paper focuses on the cooperation method of different
types of protection which protection intelligent center can participate in, and proposes a practical scheme which combines
the protection deployed in local layer and central layer to
reach an optimal protection performance. The protection
method of the system proposed in this paper is complicated to
achieve multi-space and multi-layer protection, so the verification of the protection cooperation is also provided in this
paper.
For extra-high voltage mixed line, the parameters of cable
segment and overhead line segment are different, so the fault
location method of uniform line cannot be used. Based on the
characteristics of mixed line parameters, a fault location
method for extra-high voltage mixed lines based on variation
of sequence voltage is proposed. A precision, fast calculation
method of voltage along the line is researched by using linear
equivalent. Through simulation tests the precision of method is
high. In terms of frequency domain transfer equations, sequence of the amplitude attenuation and phase delay along
fault lines are calculated. Extra-high mixed line fault types can
be divided into two categories: the asymmetric fault and the
symmetric fault. For the asymmetric fault, before fault happened, the negative sequence voltage along mixed lines is 0. So
the fault negative sequence voltage variation is the current
time negative sequence voltage. Negative sequence voltage amplitudes along mixed line are calculated by using two-terminal
electric parameters of line and compared for asymmetric fault.
The fault location is the point with equal negative sequence
voltage amplitudes. For the symmetric fault, the line will not
appear negative sequence voltage. There is positive sequence
voltage only. But, for three phase fault with transition resistance, the fault point voltage is not the lowest. The calculated voltage amplitudes along the line have two intersections:
fault point and false point. The intersections have almost equal
amplitude, so using numerical magnitude of point amplitude to
false identification is hard. To solve the problem what has
mentioned above, this paper uses the positive sequence voltage
variation for fault location. Before fault happened, the positive
sequence voltage along the line is not 0, so the positive sequence voltage variation is the difference of current and previous positive sequence voltage amplitude. Then, for
three-phase symmetry fault, the fault location is the point with
equal voltage amplitudes variation of positive sequence. Finally,
the simulation is carried out to verify the algorithm. The proposed algorithm is computationally efficient with high precision. It is not affected by transition resistance, and no false
identification problem.
TuB03.14
The Study of Area Protection Principle Optimization Based on Protection Intelligent Center in
Distribution Network
pp. 913-915
Qingping Wang
Zhiqian Bo
Lin Wang
Xiaowei Ma
Neng Jin
Fanrong Wei
XUJI Group
XUJI Group
XUJI Group
XUJI Group
Huazhong University of Science and Tech
Huazhong University of Science and Tech
With the development of communication technology, a large
number of intelligent substation has been constructed, substation area protection and wide area protection technology has
been widely used. Then Protection Intelligent Center (PIC)
taking over the main functions of multiple substations protection in the distribution network comes into being, making
large-scale information centralized processed becomes possible.
Against to the problem that traditional local information-based protection is difficult to set and coordinate
brought by increasingly complex distribution network, this
paper redefines the partition to protection are and its search
strategy, gives a fault criterion based on multi-terminal current
differential protection. Finally we propose the scheme of current differential protection based on partition principle.
TuB03.16
The Simulation Research of Transverse Differential Protection Based on Impedance Ratio for
Double Circuit Lines on the Same Tower
pp. 922-926
Shilong Li
Wei Chen
Youjie Tao
Deshu Chen
TuB03.15
A Fault Location Method for Extra-high Voltage
Mixed Line Based on Variation of Sequence
Voltage
pp. 916-921
Yunke Zhang
Botong Li
Xianguo Jiang
Zhongqing Li
Conventional current transverse differential protection has
shortages when being applied to high-voltage and asymmetry
power systems, such as low sensitivity and long successive operating zone. A new transverse differential protection scheme
based on the measurement impedance ratio is proposed. The
proposed scheme is unaffected by system impedance to a large
extent, using the ratio of the sum and difference impedance of
respective transmission line can build the criterion of the protection. PSCAD/EMTDC simulation shows that the fault re-
Tianjin University
Tianjin University
China Electric Power Research Inst
China Electric Power Research Inst
November 26-29，2015 Changsha，China
Huazhong University of Science and Tech
Huazhong University of Science and Tech
Huazhong University of Science and Tech
Huazhong University of Science and Tech
44
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
sistance almost does not affect the proposed protection. Compared with traditional current transverse differential protection the suggested protection can decrease the successive operating zone obviously. And the proposed integrated protection
scheme is simple, reliable, and easy to realize.
and equals the equivalent capacitance after that, proving that
the proposed method is accurate in identifying the traveling
wave head. In addition, the method is immune to the change of
fault location and transition resistance and is applicable in AC
systems and other DC systems.
TuB03.17
TuB03.19
W ide-area Protection Scheme for Active Distribution Networks Based on Phase Comparison
pp. 927-932
Description of Protection Intelligent Center using
IEC61850 defined SCL
pp. 938-942
Fan Zhang
Longhua Mu
Xiaowei Ma
XUJI Group
Zhiqian Bo
XUJI Group
Tongji University
Tongji University
The massive penetration of distributed generations (DGs) into
electric distribution networks may reshape it from a passive
system to an active network with bi-directional power flows,
and have a serious impact on the system contribution to fault
current. These effects may cause severe troubles for the coordination of existing current protection system. Phase comparison differential protection serves as a better option for active
distribution networks (ADNs) due to its simplicity, sensitivity
and selectivity. This paper proposes a new wide-area protection
scheme for ADNs based on phase comparison. Wide area
measurement system (WAMS) is used for time synchronous
measurement and communication. An active distribution network model with high amount of DGs is established in PSCAD/EMTDC. Theoretical analysis and system
simulation results validate the effectiveness and feasibility of
the proposed method.
Le Chen
Huazhong University of Science and Tech
Fanrong Wei
Huazhong University of Science and Tech
Introduce the Protection Intelligent Center that suit the evolution tendency of the substation form, but the new form of substation is lack of corresponding description of information
model, Based on IEC61850 defined SCL language, according to
the characteristics of the Protection Intelligent Center, the
paper put forward the structure of Protection Intelligent Center information model description. Then, based on the description of Protection Intelligent Center, a software application is
brought out that can acquire the real-time topology of the grid
within the range of Protection Intelligent Center, and the flow
chart of software is given. Description of Protection Intelligent
Center using IEC61850 defined SCL.
TuB03.18
TuB03.20
A Novel Traveling Wave Head Identification
Method in VSC-HVDC Based on Parameter Identification
pp. 933-937
Influence on the Performance of Multi-terminal
differential Protection Caused by Communication T ime Desynchronizing
pp. 943-946
Haiyang Xu
Guobing Song
Xi’an Jiaotong University
Xi’an Jiaotong University
In the voltage source converter based high voltage direct current (VSC-HVDC) transmission system, traveling wave heads
of currents and voltages are affected by fault location and
transition resistance, thus are difficult to be recognized. To
solve this problem and improve the accuracy of traveling wave
head identification, parameter identification method is adopted in the present paper. In the zero-mode network of
VSC-HVDC system, dorsal systems at both ends of DC lines
are equivalent to parallel capacitors. When an internal fault
occurs on the DC transmission lines, identified parameters
computed with measured voltages and currents reach the value
of equivalent capacitance after a sudden change at both ends,
indicating the arriving time of the traveling wave heads.
Through identifying the sudden changing time of the identified
parameter, the arriving time of the traveling wave head is then
recognized. Theoretical analyses and simulation results show
that the identified parameter changes suddenly when the traveling wave head arrives at the end of DC transmission lines
Qingping Wang
XUJI Group
Zhiqian Bo
XUJI Group
Yingke Zhao
XUJI Group
Lin Wang
XUJI Group
Suyang Ding
Huazhong University of Science and Tech
Fanrong Wei
Huazhong University of Science and Tech
As the “12th Five year development plan” of China is in progress, the new energy industry and tertiary industry has been
developing rapidly, which sets a higher requirement for the
power distribution network. In the foreseeable future, the
connecting topology of civilian distribution network would
become too complicated to the current protection method
based on local information. Therefore, the multi-terminal differential protection which has a great operating experience in
the main power network can be utilized to improve the performance of distribution network protection. However, attributed to financial affair, the communication system deployed on distribution network may not be as good as that on
45
November 26-29，2015
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
main network, which may lead to a time desynchronizing that
would heavily influence the accuracy of multi-terminal differential protection. This paper introduced method that utilizes
the optimal algorithm to calculate the possible error brought
up by time desynchronizing, and verify it through computation
examples of different kinds of conditions.
tailed expatiated at first, and the fault location process based
on direction, overcurrent and distance is analyzed. According
to the fault location, the tripping sequence of local protection
and breaker failure protection, which have a good adaptability
to different main connection and operation modes, are discussed. The proposed protection system not only provides the
local protection and breaker failure protection for all the
equipments in the substation but also shortens the operation
time and avoids the complicated cooperation.
TuB03.21
The Mechanism of Fault Searching for New Energy Distribution Network Based on Variation of
Cutting Current
pp. 947-950
TuB03.23
Yingke Zhao
XUJI Group
Zhiqian Bo
XUJI Group
Qingping Wang
XUJI Group
Compensation Scheme for Secondary Arc Current on Four Circuit Perfect Transported Parallel
Transmission Lines
pp. 956-961
Xiaowei Ma
XUJI Group
Z.Y. Xu
North China Electric Power University
Neng Jin
Huazhong University of Science and Tech
B. Gao
North China Electric Power University
Fanrong Wei
Huazhong University of Science and Tech
A new compensation scheme for four circuit perfect transposed
parallel transmission line is proposed in this paper. The new
scheme utilizes a neutral reactor to decrease the secondary arc
current and limit the recovery voltage. The results by PSCAD
show that the secondary arc current and recovery voltage can
be limited to a low level. Hence, the application of the proposed
compensation scheme can increase power system stability.
With the increase of demand in power supply demand, increased strength of connection complexity and access of renewable energy, traditional current protection has been unable
to meet the needs of the safe and reliable operation of distribution system. To prevent this, the cutting-current-based fault
location searching algorithm is put forward in this paper using
the single-end current vector. Firstly, the feeders are divided
into several stages to determine the searching section. Secondly,
search the whole line lengthways for the faulted stage, and the
accurate fault location is carried out by the breadthwise search,
and the fault can be cleared with the help of the existing
method and the proposed method. For larger distribution network, dichotomy algorithm is utilized in lengthways search to
minimize the time cost. PSCAD/EMTDC simulation results
indicate that such a method can play a complementary role for
existing protection equipped for the double end new energy
distribution network.
TuB03.24
Complete Observation against Attack Vulnerability for Cyber-Physical Systems with Application to Power Grids
pp. 962-967
Xiaoyuan Luo
Yanshan University
Jianjin Li
Yanshan University
Zhongping Jiang
TuB03.22
Xinping Guan
Scheme Design and Algorithm of Substation
Centralized Backup Protection System
pp. 951-955
Lu Zhang
Xi’an Jiaotong University
Baohui Zhang
Xi’an Jiaotong University
Ye Li
Xi’an Jiaotong University
Zhiqian Bo
Shanghai Jiaotong University
This paper presents a novel framework based on system observability to solve the structural vulnerability of
cyber-physical systems (CPSs) under attack with application to
power grids. The adding power measurement point method is
applied to detect the angle and voltage of the bus by adding
detection points between two bus lines in the power grid. Then
the generator dynamic equations are built to analyze the rotor
angles and angular velocities of generators, and the system is
simplified by the Power Management Units (PMUs) to observe
the status on the generators. According to the impact of a series of attacks on the grid, we make use of grid measurements
detection and state estimation to achieve observation status on
the grid, enabling the monitor of the entire grid. Finally it is
shown that the structural vulnerability against attacks can be
solved by combining with the above-mentioned observations.
Finally, some simulations are used to demonstrate the effectiveness of the proposed method. It is shown that some attacks
can be effectively monitored to improve CPS security.
XUJI Group
With the enlargement of the power grid, the setting and cooperation of traditional backup protection become more difficult.
Based on advanced communication network and computer
technology, a new substation backup protection configuration
using substation area information is introduced in this paper.
The structure and function of protection configuration is de-
November 26-29，2015 Changsha，China
New York University
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
non-fault reliably before three-phase reclosing, which is helpful
to avoid blind reclosing and identify the fault phase for the
arcing faults especially serious permanent faults. Moreover,
simulations verify the correctness and effectiveness of this nonfault detection method, which is helpful to improve successful
reclosing rate for three-phase reclosure.
TuB03.25
Study on Line Protection of Distribution Network with DFIG Based on Current Decay Factor
pp. 968-973
Jiandong Duan
Xi'an University of Technology
Lei Sun
Xi'an University of Technology
Shuaishuai Cui
Xi'an University of Technology
Wuji Liu
Xi'an University of Technology
Wangjing Tan
Xi'an University of Technology
TuB03.27
A Directional Comparison Pilot Protection
Scheme for Hybrid HVDC Transmission Lines
pp. 978-983
Because of the high permeability integration of the dispersed
wind power to the distribution network, the fault current direction, amplitude and phase angle have significant changes,
and it is difficult for the traditional three-current protection to
adapt these changes. The transient characteristics of the wind
turbine are not the same as the system power, leading to the
protection scheme can’t adapt to such characteristics. By theoretical derivation the transient characteristics of the doublyfed induction wind generator (DFIG), the decay characteristics of DFIG is got in this paper. According to the analysis, a
line protection scheme based on the current decay factor difference is proposed. The fault region is identified by the difference of the current decay factor between the two ends of the
fault line. Referring to the parameters of the first exemplary
project in which the dispersed wind power is integrated into
the 10kV local power grid. The active distribution network
simulation model is built in PSCAD/EMTDC, the simulation
results show that the proposed scheme can operate correctly
with different fault type, fault position and wind field output,
and it can adapt to various operating conditions sensitively and
effectively.
Yanting Wang
Xi’an Jiaotong University
Baohui Zhang
Xi’an Jiaotong University
Fei Kong
Xi’an Jiaotong University
The hybrid high-voltage direct current (HVDC) transmission
system comprising a line commutated converter (LCC) at the
sending end and a voltage source converter (VSC) at the receiving end combines the advantages of both LCC and VSC
and compensates their drawbacks. In order to guarantee the
safe operation of the hybrid HVDC system, a directional comparison pilot protection for hybrid HVDC transmission lines is
proposed in this paper. Fault direction is discriminated based
on the different characteristics of current fault component
under forward fault and backward fault. The faulty pole is
identified based on the different variation trends of voltages at
faulty pole and non-faulty pole. Simulation results show that
the proposed protection is able to distinguish the internal faults
from the external faults, identify the faulty pole, and has
enough sensitivity to high transition resistance fault as well.
TuB03.28
TuB03.26
A Method to Detect Inrush Currents in Power
Transformer Using Current Derivation Characteristics
pp. 984-987
Nonfault Detection for Three-phase Reclosure in
Reactor-compensated Transmission Lines Based
on Fault Location
pp. 974-977
Wenquan Shao
Xi’an Polytechnic University
Yue Liu
Xi’an Polytechnic University
Wangni Zhang
Xi’an Polytechnic University
Wenquan Shao
Ni Qiao
Shu Wu
Zaibin Jiao
Xi’an Polytechnic University
Xi’an Polytechnic University
Xi’an Polytechnic University
Xi’an Jiaotong University
To further improve the performance of differential protection
for power transformers, this paper presents a new method for
distinguishing inrush currents from internal faults using the
extreme value of current derivation rate. In the condition of
internal faults, its derivation rate curve is close to sine waveform and the time span between the maximum value and the
minimum one of the derivation rate is approximately near to
half a cycle. While in case of inrush currents, due to the dead
angle, the time span between the maximum value and the
minimum one is less than half a cycle. Therefore ，the difference of the time span determined by the extreme value within a
period is used to detect inrush currents. Thus, a criterion using
the current derivation rate feature is developed and the corresponding realization flow is presented. At last, the dynamic
tests under different conditions verified that the developed
A novel nonfault detection method using fault location to calculate the differential currents at fault point is proposed for
three-phase reclosure in transmission lines with shunt reactors.
In the case of a transient fault with the extinction arcnamely
nonfault, the differential currents of three-phase at fault point
are all zeros. But in the case of an arcing transient fault or a
permanent fault, the differential currents in the fault phases
are non-zero because of the fault branch, and the differential
currents of the healthy phases are close to zero as that of an
arc extinction transient fault. Meanwhile, the fault phase can
be confirmed as well based on the differential currents in the
fault phases. It is noted that the presented non-fault detection
is independent on fault phase selection and is able to detect
47
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
algorithm is of favorable performance for identifying accurately inrush currents from internal faults within a period,
which provides helpful theoretical basis for improving the
performance of differential protection for power transformers.
rithms for promoted single ended location and automatic fault
locating in teed circuit are proposed in this paper, comparatively there is no module for teed circuit in traditional systems
generally. This system has been tested by an experimental system composed of traveling wave generator and high speed data
acquisition system. The experimental results show that this
system had improved the accuracy and reliability of fault location results significantly.
TuB03.29
Research on Capacitive Current Compensation of
Differential Protection on Segment Parallel Lines
for Different Voltage Levels
pp. 988-992
Yan Yang
Huazhong University of Science and Tech
Xianggen Yin
Huazhong University of Science and Tech
Cui Tang
Huazhong University of Science and Tech
Zhe Zhang
Huazhong University of Science and Tech
Xiongwei Wang
Huazhong University of Science and Tech
TuB03.31
Advanced Fault Location System for EHV Transmission Lines
pp. 9991003
Current differential protection is the main protection of
transmission lines including multi-circuit lines, whose sensitivity and reliability is mainly affected by the distributed capacitive current, especially with the widespread application of
segment parallel transmission lines, the relationship of the
electrostatic coupling between the circuits is more complicated,
which makes the distributed capacitive current compensation
more difficult. However, in the paper both the interphase capacitive current and the capacitive current between lines are
compensated for the segment parallel transmission lines on the
lumped parameter ∏ equivalent circuit model, and by using
PSACD and matlab simulation software, it has further study of
the relationship between the differential current and the length
of segment parallel lines for different voltage levels, and some
suggestions of capacitive current compensation schemes are
proposed for segment parallel transmission lines under different voltage levels.
Hongwei Li
State Grid Of China Tech Coll
Yanli Gan
State Grid Of China Tech Coll
Haike Liu
State Grid Of China Tech Coll
Zhuangzhuang Zheng
State Grid Of China Tech Coll
Ying Zhang
Shandong University
Feng Zhang
Shandong University
In this paper, an advanced fault location system for extra high
voltage (EHV) transmission lines is proposed. This system is
based on traveling waves, and contains the promoted single
ended location method, automatic fault locating in teed circuit
and location method under strong noise background. The presented system can significantly improve the location precision
and reliability for EHV transmission line fault. This system is
verified by an experimental system developed in the laboratory
composed of a traveling wave generator and high speed data
acquisition system. The experimental results show that this
system had improved the accuracy and reliability of fault location results significantly.
TuB03.32
TuB03.30
Singularity Point Detection of High Frequency
Signal for Fault Location
pp. 1004-1009
Improved Traveling Wave based Fault Location
Scheme for Transmission Lines
pp. 993-998
Hongwei Li
State Grid Of China Tech Coll
Haike Liu
State Grid Of China Tech Coll
Haike Liu
State Grid Of China Tech Coll
Tao Jia
State Grid Of China Tech Coll
Li Mou
State Grid Of China Tech Coll
Li Mou
State Grid Of China Tech Coll
Tao Jia
State Grid Of China Tech Coll
Xin Zheng
State Grid Of China Tech Coll
Yanbo Wang
North China Electric Power University
Ying Zhang
Shandong University
Feng Zhang
Shandong University
Feng Zhang
Shandong University
Yuling Gao
State Grid Shandong Electric Power Company
Traditionally the singularity point in extreme scenarios such as
weak traveling waves may not be detected accurately as a result of their small amplitudes and naturally-existing attenuation. In this paper, a novel method based on curve fitting theory for singularity detection for extreme scenarios (weak traveling waves) is proposed, which considers both the characteristic of traveling waves and the influence of distributed capacitance at the bus bar. Mathematical equation of rising edge of
In this paper, an improved fault location system based on traveling waves, which contains several innovative algorithms, has
been proposed. In this improved system, the maininfluential
factors such as the uncertainty of wave speed and the accuracy
of transmission line length, which could affect the fault location results and generally are not of concern comprehensively
in traditional systems, have been considered, and corresponding algorithms have been presented. Besides, innovative algo-
November 26-29，2015 Changsha，China
48
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
the initial traveling wave is deduced in this paper. Furthermore,
the indirect mathematical equation based on Maclaurin expansion theory is derived to improve its feasibility in the real
application. Combining the indirect equation and the measured traveling wave data, the least-square algorithm-based
fitting curve can be obtained to determine the singularity point.
The proposed method ’s efficiency in detecting the singularity
point in weak traveling waves has been verified. The simulation results show that the proposed method had improved the
accuracy and robustness of singularity point detection for
weak waves significantly.
portance to the reliable operation of the power system. This
paper proposed a method of high-speed fault location based on
circuit breaker reclosing transients. When a fault occurs in
distributed system, faulted sections can be selected by contional methods. The circuit breaker reclosing transients is used for
exact fault distance estimation in case of an unfounded permanent fault. As a result, it takes advantage of efficiency and
practicality by reducing the time for positioning and ensuring
the accuracy of location at the same time, and it doesn’t require the introduction of additional equipment or signal path.
The performance of the proposed method is verified through
Matlab/Simulink simulation.
TuB03.33
Parameters-setting Method for Synchronization
of Pumped Storage Units under Pumping Condit i on
pp. 1010-1015
Zhiming Zhang
Shandong University
Wei Cong
Shandong University
Fei Wang
Shandong University
TuB03.35
Identification and Coping Approaches of Sympathetic Inrush Current Based on the Station-area Information of Smart Substation
pp. 1020-1024
Yi Wang
Electric Power Research Inst of Guangdong
Guowen Hao
State Grid Xinyuan Company Ltd
Jianguang Li
State Grid Xinyuan Company Ltd
Xuanwei Qi*
Huazhong University of Science and Tech
Shandong Taishan Pumped Storage Power
Xianggen Yin
Huazhong University of Science and Tech
Zhe Zhang
Huazhong University of Science and Tech
Yanping Yang
Power Grid Corporation
Station Co. Ltd
Li Gan
This paper presents a parameters-setting method for the synchronization of pumped-storage units under the pumping condition. The synchronizing process of the units is analyzed and
the synchronizing parameters-setting principle of generating
units is referred. Finally, the method is educed through mathematical formula derivation. Under the pumping condition, the
setting value of the closing pulse leading time and the synchronizing process are both different from those of the generating
condition, so the changes of voltage and frequency of pumping
condition during closing pulse leading time are deduced. Then,
the setting method of the allowable voltage difference, frequency difference and closing angular phase difference could
be obtained. The parameters-setting method in this paper provides the theoretical foundation for synchronizing parameters
setting of pumped storage unit. It is significant for decreasing
the synchronizing impact current and heightening success rate
of synchronization.
search Co., Ltd
Due to the absence of the effective identification and coping
approaches of the sympathetic inrush current, the
mal-operation of differential protection may be occasionally
caused by sympathetic inrush current. In order to address this
issue, the features of the sympathetic inrush current and the
influence of the sympathetic inrush current on the differential
protection are analyzed in detail in this paper. It is discovered
that the second harmonic phase angle difference between the
inrush current and the sympathetic inrush current are nearly
180°. Based on this, an identification and coping approaches
for the sympathetic inrush current utilizing the information
sharing between the smart substations is proposed in this paper. The effectiveness of this method is validated by the digital
simulation and dynamic model experiment.
TuB03.34
A Fault Location Method Based on Reclosing in
Distribution Systems
pp. 1016-1019
Ke Jia
Zhefeng Ren
Tianshu Bi
Bohan Liu
Changjiang Survey, Planning, Design and Re-
TuB03.36
Fault transient analysis in Microgrid using discrete wavelet transform
pp. 1025-1029
North China Electric Power University
North China Electric Power University
North China Electric Power University
State Grid AC Engineering Construction
Company
Long Zhou
Geng Niu
Zhiping Qi
Guohua Gao
Yonggang Xu
Fast and accurate fault location is crucial for the rapid recovery of power supply in distribution network and also vital im-
49
University of Chinese Academy of Sciences
University of Chinese Academy of Sciences
University of Chinese Academy of Sciences
Beijing University of Technology
Beijing University of Technology
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Microgrid is an effective means to integrate distributed generations and manage their power flows. Since the high penetration rate of DGs in microgrid and its capability to operate in
grid-connected mode or islanded mode, the fault patterns of
microgrid are not that obvious as those shown in the traditional low voltage distributed networks. Thus an extensive
knowledge of fault transient characteristics is beneficial to
design effective protection schemes for microgrid. Since conventional methods have difficulties in analyzing transient signals, discrete wavelet transform is employed in this paper to
identify fault patterns from fault current/voltage signals. Aiming to provide a solution to the problems arise from applying
wavelet in microgrid with short line segments, this paper proposed an improved wavelet transform method that using
Daubechies complex wavelet with cubic spline interpolation. A
modified benchmark microgrid network is modeled in
Matlab/Simulink to verify the proposed method. Four types of
fault cases in bus-bar and feeder are investigated respectively,
and the simulation results indicate the unique fault patterns in
the form of modulus maxima and wavelet energy.
TuB03.38
A Distance Local Backup Protection Scheme
Based on Regional Pilot Principle
pp. 1036-1042
Jun Guan
Xi’an Jiaotong University
Wenzhe Chen
Xi’an Jiaotong University
Feng Dai
Jiangsu Electric Power Company
Jieqing Deng
Jiangsu Electric Power Company
Yidan Liu
Jiangsu Electric Power Company
Xiaohui Jia
Jiangsu Electric Power Company
Wei Cong
Shandong University
Jing Xiao
State Grid Shandong Electric Power Com-
Yingchun Feng
State Grid Shandong Electric Power Company Maintaince Company
Anning Wang
State Grid Shandong Electric Power
Company
This paper presents a new scheme for distance local backup
protection. In this scheme, two main points are included: The
first is the distance component that could reliably detect all the
faults occurring in protection area; the second is the pilot
comparison strategy which is based on the results of distance
components. The former employs the setting principle that
could meet the requirement of sensitivity when the fault occurs
at the end of line where the protection installed. The later
could confirm the fault location through the comparison between results of distance components, and then the operating
delay time would be flexibly determined depending on fault
location. Regional pilot distance local backup protection could
make sure that the speed and the selectivity would meet the
requirement. Meanwhile, the cooperation between different
kinds of protections would be simplified and the improved
protection performance of the backup protection could be realized. Through the simulation sample, it can be seen that the
protection scheme proposed in this paper could reliably judge
the fault, and then the speed and the selectivity of the local
backup protection would be guaranteed, meanwhile this
scheme partially possesses the ability of fault tolerance.
Anti-saturation Algorithm in Differential Protection Based on the Phaselet
pp. 1030-1035
Xi’an Jiaotong University
Shandong University
pany Maintaince Company
TuB03.37
Zhiguo Hao
Zhiming Zhang
Current-transformer (CT) is prone to get into transient saturated during the fault in the power system. The transient saturation of CTs will cause serious distortion in the secondary side,
operation performance of differential protection based on the
traditional algorithm is seriously influenced. The phaselet algorithm can accurately obtain the basic frequency component
of the fault current with the unsaturated data segment of CTs’
distorted secondary current in a relatively short time window.
This paper researches the principle and features of the
phaselet algorithm, eliminates the influence of the decaying DC
component with the first order difference compensation, gives
out the calculation process of the phaselet algorithm, proposes
the scheme for the CT’s anti-saturation of the differential protection based on the phaselet algorithm. Finally, the accuracy
of the phaselet algorithm is verified by CTs’ transient experiment data, and the validity of the scheme applying in the line
differential protection is tested by the simulation in PACAD.
TuB03.39
Analysis on Single-phase Line Break Fault of
10kV Non-grounded Distribution Network
pp. 1043-1049
Rui Wang
Shandong University
Wei Cong
Shandong University
Qibao Kang
Shandong University
Guoqiang Liu
Binzhou Power Company of State Grid Shandong Corporation
Hui Wang
Binzhou Power Company of State Grid Shan-
Ruipeng Yi
Binzhou Power Company of State Grid Shan-
dong Corporation
dong Corporation
November 26-29，2015 Changsha，China
50
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Line break fault is becoming more and more frequent in 10kV
neutral point non-grounded distribution system. This paper
takes 10kV distribution line single-phase line break fault as the
research object, analyzes the characteristics of electrical quantities when single-phase line break fault occurs, including single-phase line break without grounding point, single-phase line
break with grounding at power supply side and single-phase
line break with grounding at load side. Electrical quantities
during single-phase line break fault are analyzed using symmetrical component method with sequence network and vector
diagram, the variation of electrical quantities are summarized,
and protection criterion for single-phase line break fault is
proposed. Simulation results by PSCAD/EMTDC ensure the
correctness of the analysis results and line break protection
criterion.
TuB03.41
Failure Mechanism Study of Conventional Active
Methods Based on Inverter Disturbances and A
Novel Islanding Detection Method
pp. 1056-1062
Ke Jia
North China Electric Power University
Kaixiang Huan
North China Electric Power University
Hongsheng Wei
North China Electric Power University
Dongfang Wang
State Grid Qinghai Electric Power Company
Chunlai Li
State Grid Qinghai Electric Power Company
TuB03.40
Fault component comprehensive impedance
based back-up protection algorithm for intelligent substation
pp. 1050-1055
Zhongqing Li
China Electric Power Research Inst
Wei Li
China Electric Power Research Inst
Hong Cao
Guoqing He
China Electric Power Research Inst
Guanghui Li
China Electric Power Research Inst
This paper analyzes the failure mechanism of the typical active
islanding detection method (f-Q feedback islanding detection
method) under multi-inverter distributed generation (DG)
system circumstances. When disturbances produced by each
inverter almost counteract each other or the reactive power
variation of local load matches the reactive power disturbance,
the f-Q feedback detection method will be malfunction. A novel
active islanding detection method suitable for both single-DG
and multi-DG system is put forward in this paper. It is based
on impedance estimation and applies an external centralized
disturbance algorithm to avoid mutual interferences of multi-supply disturbance signals. The method has high accuracy of
detection and a high detection speed.
North China Electric Power University
A novel back-up protection algorithm for intelligent substation
based on fault component comprehensive impedance is proposed in this paper. Calculation analyses of fault component
comprehensive impedances of bus-line region, transformer-bus
region and combination region are completed. The fault component comprehensive impedance of each zone reflects the
positive-sequence impedance of the external system when an
internal fault occurs. In a situation of external fault, it reflects
positive-sequence magnetizing impedance or line positive-sequence capacitive reactance. In a situation of magnetizing inrush current, the fault component comprehensive impedance of the region which contains transformer reflects line
positive-sequence capacitive reactance or decreasing positive-sequence magnetizing impedance. Fault location is implemented accurately according to the magnitude of fault component comprehensive impedance of each zone which in external
fault situation is much larger than that in an internal fault
situation. Then back up protection sends out trip signals after
a time delay on the condition that failure still exists and the
main protection of the fault element refuses to act. This algorithm is immune to transformer inrush current and high resistance fault, which has higher sensitivity than substation-area
differential backup protection. Simulation tests based on
PSCAD simulation model verify the proposed algorithm’s validity and superiority.
TuB03.42
Compensation of Saturation in Current
Transformer using Modified Prony Method
pp. 1063-1067
Jieqing Deng
Maintenance Branch of State Grid Jiangsu Electric Power Company
Zhi Yang Hao
Xi’an Jiaotong University
Zhiguo Hao
Xi’an Jiaotong University
Feng Dai
Maintenance Branch of State Grid Jiangsu Electric
Power Company
Xiujin Li
Maintenance Branch of State Grid Jiangsu Electric
Power Company
Xiaohui Jia
Maintenance Branch of State Grid Jiangsu Electric
Power Company
Peng Li
Jiangsu Electric Power Company Research Institute
A novel scheme is proposed to fit and recover the primary
current of the current transformer when transmission line
fault occurs. Based on an iterative form of Prony method, the
whole process require less than 1/4 of a cycle of base frequen-
51
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
cy.Due to the inconsistence of Prony method when embedded
with noise and error, effective saturation detection and noise
filtering algorithm using mathematical morphology transform
are also applied in the scheme. Data obtained in a test system
build by PSCAD software and practical experiments are both
used to evaluate the performance of the proposed scheme.
In order to solve the problem how to detect the wave head for
traveling-wave based fault location when fault occurs, a new
kind of wave head detecting algorithm for precise positioning
which based on Kalman filtering is proposed.Model of voltage
traveling wave is set up according to the actual characteristics
of traveling wave signal. Recursion method of Kalman filtering
is used to process the signal which contains fundamental component and harmonic component in the model. Getting the
filter results and wave head signal can be achieved by subtracting the result from the original signal. The single-phase
grounding model is established, then use this method to extract
the wave head signal from the transient travelling wave signal
in this model. Simulation results show that, the method proposed can effectively detect the wave head, so it has promoted
value.
TuB03.43
Simulation of Transformer W indings Mechanical Characteristics During the External
Short-Circuit Fault
pp. 1068-1073
Dan Zhou
Electric Power Research Institute of Guangdong
Power Grid Corporation
Zhengyuan Li
Tu B03.45
School of Electrical Engineering Xi’an Jiaotong
University
Chunjun Ke
The Influence Research of Large-scale W ind
Power on Out-of-step Oscillation of The
Northwest China Power Grid
pp. 1080-1084
Electric Power Research Institute of Guangdong
Power Grid Corporation
Xian Yang
Electric Power Research Institute of Guangdong
Power Grid Corporation
Zhiguo Hao
Qi Liu
School of Electrical Engineering Xi’an Jiaotong
University
Jiong-cong Chen Guangdong Electric Power Research Institute
Wen-jie Zheng
Guangdong Electric Power Research Institute
Zhi Li
North China Electric Power University
Jian-xiong Lin
North China Electric Power University
November 26-29，2015 Changsha，China
HeFei University of Technology
State Grid Lianyungang Power Supply Company
Shuanbao Niu
Northwest China Grid Company
Xianbo Ke
Northwest China Grid Company
China Electric Power Research Institute State Grid
Based on theoretical research of the influence of Doubly Fed
Induction Generator (DFIG) on equivalent system, it is offered
that the oscillation is affected by the characteristic of wind
turbine. The qualitative analysis shows that the influence of
reactive power voltage control mode and protection mode of
wind turbine to oscillation mode are unignorable. It is studied
that the influence of DFIG active power output to oscillation
splitting strategies. Grid simulation result shows that the wind
turbine is likely to drop out from the grid if the wind turbines
without Low Voltage Ride Through (LVRT) feature. As a result,
oscillation will become more obvious, or even new out-of-step
oscillation will emerge after wind turbines generator tripping.
Reactive power and voltage control has little effect on the oscillation. It is found that the splitting strategies will be affected
by the variation of DFIG active power output during a relative
long time period compared to the transient oscillation process.
The reason behind is that the power flow distribution and
voltage level of the system will change due to the variation of
DFIG active power output which will finally influence the
splitting strategies in some extent.
Guangdong Electric Power Research Institute
Guangdong Electric Power Research Institute
Ming Sun
Corporation
Research on the wave head detecting algorithm based on Kalman filtering
pp. 1074-1079
Shu Huang
China Electric Power Research Institute
Yunting Song
Tu B03.44
Chuan-jian Li
Jian Ding
Jiantao Gao
With the development of voltage level and capacity in recent
years, the impact of external short circuit has a growing threat
to the stability of transformer windings than ever before. Because of the weakness of anti-short-circuit capacity, around
40% of the transformer faults are caused by the huge impact
of short circuit every year. In view of this, it is of great significance to study the mechanical behavior of transformer winding structures during external short-circuit faults. This paper
represents investigations of short-circuit current, the transient
leakage magnetic field, electromagnetic forces and the von
Mises stress of a real full-scale 500kV single-phase two windings transformer during the external short-circuit transient
process.
HeFei University of Technology
52
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Tu B03.46
Tu B03.48
Analysis on the Effects of 500kV Main Transformer Single-phase Replacement on Differential Protection
pp. 1085-1088
Meng Li
South China University of Technology
The Warning Strategy Research on Safety
Measures of Smart Substation According to Correlation Model
pp.1095-1098
Chengjun Xia
South China University of Technology
Haihua Sheng
State Grid Zhejiang electric power company
Jianli Shi
State Grid Zhejiang electric power company
Guihua Qiu
Foshan Electric Power Bureau
Combined with the project which studies the feasibility of replacing a 500kV substation No.2 main transformer and based
on PSCAD/EMTDC, this paper introduces a special autotransformer model to study the effects of percentages of
threephase winding short circuit voltage on the transformer
differential protection under normal operation and fault conditions after replacing the B-phase transformer for No.2 main
transformer with original A-phase transformer for No.1 main
transformer. It is preliminarily concluded that the replacement
has little effect on differential protection and a certain degree
of asymmetry of the percentage of three-phase winding short
circuit voltage is allowed, which provides new ideas and references for further study on three-phase transformer single-phase replacement.
Qunhui Qiu
State Grid Zhejiang electric power company
Weijian Jiang
State Grid Zhejiang electric power company
Juntao Niu
Wuhan Kemov Electric Co.,Ltd.
For the problem of safety measures in maintaining work of
smart substation’s secondary system, this paper proposes a
warning strategy according to correlation model. The strategy
revolves around maintained IED, searches for relationship
with other IEDs and establishes correlation model according to
SCD file. The safety measures can be built automatically based
on the correlation model, and can also be used to check if the
work ticket and operation ticket are correct and comprehensive before they are executed. In addition, the setting of safety
measures at substation site can be online read through MMS
message. The warning strategy compares the read results with
the given safety measures step by step, and maintaining work
can be carried out only when all steps are passed.
Tu B03.47
Performance of ROCOF Protection in Microgrid
pp. 1089-1094
Tu B03.49
Bohan Liu
State Grid AC Project Construction Co.,Ltd.
Application of High Sampling Rate Data in
Guozeng Yan
State Grid AC Project Construction Co.,Ltd.
Ke Jia
State Grid AC Project Construction Co.,Ltd.
Feng Yuan
State Grid Yingkou Electric Power Company
Merging Unit for Relay Protection
pp. 1099-1104
Kaibo Liu
China Electric Power Research Institute
Hang Lv
Accompanying the fast development of DG system and more
DGs connecting to the distribution system, some new problems
appear in protection technique area about grid-connected DG
system, among which islanding is a typical and major one.
Unplanned islanding will bring many problems to the grid: It
threatens the life safety of power line maintaining staff and
consumers; influence normal operation of equipment in the
islanding system as well as reclosing action. This paper investigates the performance of rate of change of frequency
(ROCOF) as used in embedded generation islanding detection
of DFIG wind turbines. The impedance measurement based
inter-lock algorithm was proposed to prevent the ROCOF
from false tripping during a non-islanding situation. The simulation results show that the proposed inter- lock function can
effectively distinguish the islanding and non-islanding situations.
NR Electric Co., LTD.
Zhongqing Li
China Electric Power Research Institute
This paper proposed a scheme of high sampling rate data in
merging unit for relay protection. The data synchronization
method based on the basic concepts of SMV, the low pass filter
(LPF) algorithm and interpolation principle are studied, and
then the protection scheme is proposed. The conclusion of the
study showed that low pass filtering and interpolation synchronization scheme is simple and efficient for high rate sampling. That changing sampling data interface to enable the
arithmetic and logical constant of protection can effectively
reduce the risk of operation. This paper then tested the application in real time digital simulation (RTDS) system.
53
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Dingxiang Du
China Electric Power Research Institute
Xingguo Wang
China Electric Power Research Institute
AC Transmission Line Fault Current Analysis in
Zhongqing Li
China Electric Power Research Institute
220kV AC/DC Hybrid System
A maloperation prevention method of zero se-quence direction
longitudinal protection was presented in this paper directing at
broken-line faults of double-circuit transmis-sion lines on a
same tower. Firstly, the maloperation reasons were analyzed in
detail. Then, the zero sequence direction amplitude-comparison criterion and the negative sequence direction
ampli-tude-comparison criterion were constructed. The zero
sequence criterion is used to detect earth faults sensitively and
the negative sequence criterion is used to avoid maloperation
of zero sequence criterion resulting from electrical and magnetic coupling during broken-line period. Meanwhile, the zero
sequence current threshold and negative sequence current and
voltage threshold were set for insuring the reliability of the
whole protection scheme. The interior fault logic is that the
zero sequence direc-tion criterions of the two sides of lines both
reveal forward direc-tion. If that occurs, the zero sequence
longitudinal protection acts and the fault line is removed. Otherwise, the protection will not act. Finally, the simulation results demonstrated the availability of the presented protection
method.
Tu B03.50
pp.1105-1109
Wenyuan Zhao
Shenxing Shi
Zhenghao Wang
Xinzhou Dong
Northeast Dianli University
Tsinghua University
Northeast Dianli University
Tsinghua University
This paper analyzes AC transmission line fault current in
220kV AC/DC hybrid system due to DC fast adjustment features. To illustrate the effect of DC response on AC fault current, a back-to-back HVDC system in 220kV hybrid system is
exampled in the paper. After introducing basic principle and
control method of HVDC system, the paper establishes simulation models of 220KV AC transmission system and 220KV
AC/DC hybrid transmission system based on electromagnetic
simulation software SIMULINK. Simulation results show that
fault current in AC/DC hybrid system is different from the AC
system, which will make AC transmission line protection
misoperate or mal-operate.
Tu B03.51
An Adaptive Fault Line Selection Method Based
on Wavelet Packet Comprehensive Singular Value for Small Current Grounding System
pp. 1110-1114
Xiangxiang Wei
China Agricultural University
Dechang Yang
China Agricultural University
Tu B03.53
A Logic Protection Program Design of Urban Distribution Network
pp. 1120-1124
In this paper, an adaptive fault line selection method based on
the wavelet packet comprehensive singular value for small
current grounding system is presented. First of all, wavelet
packet decomposition is utilized to decompose transient zero
sequence current (TZSC) of 2 cycles, then the comprehensive
singular values are introduced to describe the fault information. Secondly, normalize the comprehensive singular values
to compute the fault membership values. At last, according to
the difference between the maximum membership value and
the second maximum membership value, the selected fault line
can be output. The simulation results show that the proposed
method cannot be affected by fault line type, fault resistance
and fault initial phase angle, and also has good anti-noise capability.
Maloperation prevention study of zero sequence
direction protection to broken-line faults of parallel circuits on same tower
pp. 1115-1119
China Electric Power Research Institute
November 26-29，2015 Changsha，China
Qinhuangdao power supply company
Ruijun Bu
Qinhuangdao power supply company
Kexue Liu
Qinhuangdao power supply company
Kai Zhou
Qinhuangdao power supply company
Tianshun Ma
Qinhuangdao power supply company
WenJun Li
Qinhuangdao power supply company
The traditional protection of urban distribution network has
series of shortcomings such as the difficulty of coordination
between protections, the large scope of blackout area and a
long time for fault removing. Considering above situation, the
paper presents a logic protection of urban distribution network.
Based the location in the distribution network, the switches are
classified with which the protection action criterion is given.
Combined with the actual characteristics of urban distribution
network, the logic protection program is designed. The analysis
of example verifies the effectiveness of the program.
Tu B03.52
Xianguo Jiang
Fuchun Zhang
54
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Transient Temperature F ield simulation based
on ANSYS for oil-immersed smoothing reactor
when repeatedly Commutation Failure
pp. 1137-1141
Tu B03.54
Research and Application of Network Load
Stress Test for Smart Substation
pp. 1125-1130
Ming Cai
State Grid Jiangxi Electric Power Company
Qi Xiao
State Grid Jiangxi Electric Power Company
Yuyun Chen
State Grid Jiangxi Electric Power Company
Wenxing Cheng
State Grid Jiangxi Electric Power Company
Xiaobing Zhou
State Grid Jiangxi Electric Power Company
Kai Zeng
Changsha University of Science and Technology
Rui Ma
Changsha University of Science and Technology
Haijing Yang
State Grid HAEPC Electric Power Research Institute
Yongchao Liang Human Electric Examine and Repair Company
Gas relay takes the oil velocity in its installation location as the
action criterion, and the gas and oil inflation which affect the
oil velocity are caused by the fault fever. This paper researched
the fact that flat wave reactor’s repeatedly commutation failures cause flat wave reactor gas relay’s malfunction, and proposed a transient temperature field simulation method of flat
wave reactor under fault. The current situation of flat wave
reactor when commutation fails is determined firstly. ANSYS
is used to establish the geometric model of flat wave reactor.
Normal temperature field is taken as initial value, and fault
current is added, then transient temperature field of flat wave
reactor under repeatedly commutation failures is calculated.
This method can effectively simulate the temperature field of
different time from the fault starts, and provide the basis for
further calculation of oil velocity and analysis on gas relay
operation.
Load stress test of secondary equipment network is important
for the large-scale construction of smart substations. In this
article, several secondary equipment network schemes and
their influence on relays related IEDs are discussed, and then
stress test objects, principles for smart substation are proposed.
Based on embedded CPU and large-scale FPGA, load stress
testing device for secondary equipment network in smart substation is implemented with characteristic of supplying multi-type stress data stream along with IEDs’ necessary working
stream, and field test practice is introduced in the end.
Tu B03.55
Tu B03.57
A Simulation Platform for the Analysis of the
Current Transformer Transient Characteristic
pp. 1131-1136
Xuanwei Qi
The Substation Fault Diagnosis Method Based on
the T ime Constraint Probability Petri Net
pp. 1142-1146
Huazhong University of Science and Technology
Xianggen Yin Huazhong University of Science and Technology
Zhe Zhang
Huazhong University of Science and Technology
Li Gan Changjiang
Survey, Planning, Design and Re-
Liang Gong
Changsha University of Science and Technology
Rui Ma
Changsha University of Science and Technology
Hai-jing Yang
State Grid HAEPC Electric Power Re-
search Co., Ltd
search Institute
The analysis of the current transformer transient saturation
characteristic and its impact on differential current protection
is an urgent problem to be solved. A simulation platform for
analyzing the transient characteristic of the current transformer is introduced in this paper. The actual operating scene
can be constructed in this platform in order to perform the
complex transient process of power system. A variety of complex transient process in the power system can be simulated.
The class P, PR and TPY current transformer model can be
selected for analyzing the transient characteristic of the current transformer. This platform can achievement the analysis
on the current transformer transient characteristic and its
impact on the differential protection. The dynamic test and
practical application prove the accuracy and the effectiveness
of this platform.
Yinghong He
Hunan Ryan electrical engineering Company
There exist some difficulties in existing substation fault diagnosis when dealing with the alarm information misstatement,
omission, relay protection, breaker malfunction and tripping
and such uncertain information. Therefore, the author put
forward a kind of Petri net based on time constraint possibility
of substation equipment fault diagnosis method to solve the
problem of the uncertainty of substation fault diagnosis. First,
time interval back model is constructed to represent the time
constraints in the process of failure, to modify the alarm information, and delete the alarm information which is not in
conformity with the temporal constraints. Then use probability
indicates protection and circuit breaker movement situation
and further processing uncertain information in case to increase the rate of fault tolerance. Finally, the correctness and
effectiveness of the method is verified by the example analysis.
Tu B03.58
Tu B03.56
55
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
pp. 1157-1161
Research on Traveling Wave Fault Location System based on High Accuracy Synchronous Clock
pp.1147-1151
Zhiyuan Pan
State Grid of China Technology College
Hongwei Li
State Grid of China Technology College
Feng Deng
Jing Wang
State Grid of China Technology College
Xinran Li
Changsha University of Science and Technology
Hunan University
Xinyue Si
Xiangjun Zeng Changsha University of Science and Technology
Shandong University
With increasing integration of distributed generation (DG) to
the active distribution systems, the existing grid structure and
protection configuration cannot meet the requirements of reliability. Adopting closed-loop configuration and reasonable
protection schemes, it is possible to reduce the range of power
outage and ensure continuous supply of DG. Firstly, an IED
(intelligent electronic device) based complete protection structure consisting of several protection functions is proposed,
including line protection, load protection and node protection.
The protection principles of each protection function is described. The paper also studies the single-terminal weak-infeed
issue of closed-loop distribution system by theoretical and simulation analysis. It is proved that the current phase variation
based line protection function is not affected by the magnitude
of fault current. It could correctly identify the fault under single-terminal weak-infeed condition.
Nowadays, the reliability and accuracy of synchronous clock in
the power system protection and location is hardly realized.
High accuracy synchronous clock based on GPS and BEIDOU
navigation satellite system was presented in the paper. Firstly,
the accumulating error produced by crystal oscillator can be
eliminated by reference of GPS 1PPS based on digital phase
lock principle, and then GPS and BEIDOU mutual backup
scheme can guarantee the reliability of synchronous clock
when GPS worked under abnormal status or random error
was too large. And then on the basis of high accuracy synchronous clock technology, a network-based traveling wave
fault location system was proposed. The presented system operated in Hunan Changsha and Zhuzhou power system, and
the results showed that it had great reliability, stability and
accuracy.
Tu B03.59
Tu B03.61
Operation Behavior of Converter Bridge Differential Protection in Converter Station of HVDC
System
pp. 1152-1156
A Novel Protection Scheme for Turn-to-turn
Fault of Thyristor Controlled Transformer Controllable Shunt Reactor
pp. 1162-1165
Hanli Weng
China Three Gorges University
Xuehua Li
China Three Gorges University
Guowen Yang
China Three Gorges University
Tao Zheng
Ying Jin
Fenfen Zhang
Lianguang Liu
Thyristor controlled transformer controllable shunt reactor
(TCTCSR) with advantages of rapid response and continuously adjustable capacity is the preferable choice for reactive
power control in EHV/UHV power system. But the protection
scheme of TCTCSR is rarely studied. This paper addresses a
problem in the application of traditional current differential
protection against turn-to-turn faults where the traditional
protection scheme may have less sensitivity or even refuse to
operate in certain fault cases. Theoretical analysis is presented
in this paper and three-phase fundamental zero-sequence
component of CtrW as criteria to detect turn-to-turn faults is
proposed to overcome the problem in traditional protection
scheme. Finally, the setting value of the proposed method and
its impact factors are discussed.
Aiming at the abnormal operations of converter bridge differential protection of high voltage direct current(HVDC) transmission project, the operation behavior simulation of converter
bridge differential protection under various fault conditions is
carried out and the reason of the abnormal operations of converter bridge differential protection are explained and analyzed on the basis of PSCAD/EMTDC model. The simulation
results indicate that, the converter bridge differential protection can operate correctly when a fault current difference exists between the sampled values of current transformers (CTs)
on the △ bridge and Y bridge of the valve side. If the fault
current flows or does not flows simultaneously into the CTs on
the △ bridge and Y bridge of the valve side, the refusal- operation of converter bridge differential protection will occur.
Tu B03.62
Tu B03.60
Complete Protection Scheme
Closed-loop Distribution Systems
North China Electric Power University
North China Electric Power University
North China Electric Power University
North China Electric Power University
for
November 26-29，2015 Changsha，China
Identification Method for Internal and External
Faults Based on Amplitude Feature of Backward
Active
56
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Networks
Traveling Wave for HVDC Transmission Line
pp. 1166-1169
Xiaopeng Li
State Grid Sichuan Electric Power Research Institute
Sheng Lin
Southwest Jiaotong University
Shuai Jiang
Xi’an Jiaotong University
The theoretical analyses about the traveling wave transmission
process for internal and external faults at HVDC transmission
lines show that, in a short time, for internal faults, the backward traveling waves can be detected at both line terminals.
For external faults, the backward traveling wave can be detected only at one line terminal. The backward traveling wave
in the other terminal is zero in theory. Taking the calculation
error and noise into account, the amplitude of the backward
traveling wave is still very small. Thus, the identification
method for internal and external faults for HVDC lines can be
proposed by comparing the amplitude of the backward traveling waves at both ends of line. For internal faults, the ratio of
the integral results is relatively small. However, for external
faults, the ratio of the integral results is relatively large. Plenty
of simulation results based on PSCAD/EMTDC indicate that
the proposed protection method can discriminate internal
faults from external faults under various fault conditions including faults with high fault resistances.
To solve the problem of precise location for long-standing single-phase grounding fault in complex treetype distribution
network, a novel single-phase grounding fault location method
with traveling wave has been proposed. This paper studied
transmission characteristics of traveling wave modulus, and
presented a new fault location method combining the two traveling wave principles. First, the multi-terminal location algorithm was established to find out fault trunk line and narrow
fault location scope. Second, a double-terminal fault location
algorithm based on the time gap between zero mode and aerial
mode traveling has been put forward to calculate the fault
distance. Finally, according to the information of multi-terminal and double-terminal fault location, the fault point
was located. Simulation results indicated that the location
method can carry out accurate fault location with traveling
wave location device mounted on only part of the ends in the
distribution network. Therefore, it can save investment effectively, and has advantages of little data load and simple algorithm implementation.
Tu B03.63
Tu B03.65
Reliability Evaluation of Distribution Network
Based on Sequential Monte Carlo Simulation
pp. 1170-1174
Qi Lu
Insulation Faults Detection and Location System
with Traveling Wave for Transmission Lines
pp. 1180-1183
Nari Technology Development Limited Company
Yujie Hua
Nanjing University of Science and Technology
Ye Shen
Nanjing University of Science and Technology
Qi Kang
New York Institute of Technology
Rong Zhang
pp. 1175-1179
Huan Ye
Guangdong Power Grid Corporation
Kexin Rui
Changsha University of Science and Technology
Zi-kun Zhu
Guangdong Power Grid Corporation
Xiangjun Zeng Changsha University of Science and Technology
Dong-mei Yang
Guangdong Power Grid Corporation
Yan-zhao CAO
Guangdong Power Grid Corporation
Xiangjun Zeng Changsha University of Science and Technology
Ke Zheng
Changsha University of Science and Technology
This paper designed an insulation faults detection and location
system with traveling wave for transmission lines, to solve the
problem of precise detection. A special traveling wave sensor
was developed based on the two order differential principle,which enhanced the wave head steepness, then to improve
the the detection accuracy. On this basis, combined with GPS
satellite synchronous precision timing and GPRS wireless
communication technology, the insulation faults detection and
location system with traveling wave was proposed. And the
initial fault point is located by a double-terminal fault location
algorithm. The testing results showed that the detection sensitivity of partial discharge flashover current is 2.134A, which
verified the performance of the proposed system for the insulation faults.
Shanxi University of Technology
In this paper, the reliability evaluation of distribution network
is studied by using the sequential Monte Carlo simulation
based on dual sampling. A reliability evaluation model of distribution network is established. The range influenced by fault
is determined by the analysis method of node fault. And then,
all kinds of reliability index are calculated. With matlab programming, IEEE RBTS Bus 6 test system is evaluated to prove
that the method in this paper is effective. Then the simulation
analysis is carried out for the cases that whether there is a
standby transformer in power distribution network, whether
the circuit breaker is reliable and whether there is a contact
switch between the two feeders. The results show that the reliability of distribution network system can be enhanced by
adding the standby transformer and the contact switch and
improving the reliability of the circuit breaker.
Tu B03.66
Tu B03.64
Household distribution protection device with
fault pre-detecting
A Novel Single-phase Grounding Fault Location
Method with Traveling Wave for Distribution
57
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
pp. 1184-1189
Tu B03.68
Xiangjun Zeng Changsha University of Science and Technology
Weiming Zhang
Changsha University of Science and
A new method for fault line selection based on
Technology
Shun Xu
correlation between zero-sequence voltage in
bus and zero-sequence current in feeders
pp. 1196-1199
Hunan Hydro & Power Design Institute
Yingke Gu
Changsha University of Science and Technology
Bin Zhang
Hunan Province Planet Intelligent Electricity De-
Yunkun Xiang Changsha University of Science and Technology
velopment Company
Yun Jiang
This The development of human’s living condition and the
corresponding technology application in low-voltage distribution system have currently caused lots of power consumption.
Thus, it is important to find out the fault location and switch
off the device before fault occurring. This paper analyzes the
principle of leakage current &short-circuit current fault detection, applies fault pre-detecting theory to preclude the hidden
fault, provides the measure of isolating force electricity from
weak electricity, designs a novel household distribution protection device with fault pre-detecting. Its performance meets
relevant low-voltage distribution system standards. Simulation
and practical application show that the device has a bigger
advantage of troubleshooting, correct malfunction for relays.
Therefore the device is more smart and practical than traditional protection device and has more value for popularization.
Yuanzhi Ning Changsha University of Science and Technology
Dual-loop Control Strategy of Three-phase Unbalance Overvoltage Active Suppression Device
in Distribution System
pp. 1190-1195
Yancun Cai
Changsha University of Science and Technology
Changsha University of Science and Technology
Based on Distance Proportion and T ime Difference for Distribution Network
pp. 1200-1205
The three-phase unbalanced overvoltage exists normally in arc
suppression coil grounded distribution network. Excessive
unbalanced voltage threatens the proper operation of electric
equipment and affects the quality of power supply. In this paper, a suppression method by injecting zero-sequence current
to the neutral point through an active inverter device was proposed to inhibit overvoltage in distribution network which was
caused by single-phase overload or the asymmetry of
three-phase line-to-ground parameters. Then, a dual-loop control strategy consists of a proportional resonant controller and
a dead-beat controller was designed, it makes it easy to suppress the unbalanced voltage quickly and precisely without
measuring the grounding parameters of the network. Finally, a
10kV distribution system model was built in MATLAB for
analysis. Simulation and prototype testing results showed that
the suppression system has good steady-state and transient
response.
November 26-29，2015 Changsha，China
Bohan Liu
A Novel Traveling Wave Fault Location Method
Xiangjun Zeng Changsha University of Science and Technology
Changsha University of Science and Technology
Changsha University of Science and Technology
Tu B03.69
Changsha University of Science and Technology
Wen Wang
Fang Tao
It is difficult to select the fault line due to the weak current
when the single-phase grounding fault occurs in the resonant
grounding system. A new method based on correlation between
zero-sequence voltage in bus and zero-sequence current in
feeders is proposed in this paper. The correlation coefficient is
less than zero because the polarity of zero-sequence voltage
and zero-sequence current is opposite in fault line, and correlation coefficient is large than zero because the polarity in
sound line is same. Therefore, the feeder what corresponding
to the minimum correlation coefficient is the fault line. Most
simulation results show that in resonant grounding system,
compared with the integrated correlation coefficient analysis
between pure fault components of zero-sequence current from
every line, this method can be applied to select fault line more
better, and misjudgment will not be caused.
Tu B03.67
Feng Zhou
Changsha University of Science and Technology
Jun Cai
Changsha University of Science and Technology
Xiangjun Zeng Changsha University of Science and Technology
Yi Yang
Changsha University of Science and Technology
Shuguang Deng
Hunan City University
In order to solve the problem that the accuracy of fault location is influenced by traveling wave speed and conductor sag, a
new method of traveling wave fault location based on the distance proportion and time difference presented in this paper.
Firstly, installed traveling wave acquisition device at the end of
each line and substation bus in distribution network, a standard array of the arrival time difference of traveling wave is
constructed based on the time difference between simulating
faults and the head/end of fault line. And then, comparing the
actual array of the arrival time difference of traveling wave
with the standard array, the fault section can be distinguished.
Calculating the distance ratio between the fault point to the
head of fault section and the whole length of the fault line, then
58
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
the fault position is determined on the basis of the location of
each tower and cable connector. Finally, the ATP/EMTP simulation results show that this method is not affected by the wave
velocity and the change of line length, and with high fault location precision compared with traditional method.
By setting appropriate proportional and integral coefficient of
PR controller, the controllability of injecting current and the
static performance of system were improved. Simulation analysis and prototype test results verified that the control method
has high precision and low steady-state error, and is able to
suppress three phase unbalanced voltage quickly and accurately.
Tu B03.70
IMF Energy Moments and LS-SVM Based Fault
Section Location Method for Distribution Network
pp.1206-1213
Tu B03.72
A Novel Three-phase Unbalanced Voltage Flexible Restraining Method for Distribution Systems
pp. 1220-1223
Yingke Gu
Changsha University of Science and Technology
Xiangjun Zeng Changsha University of Science and Technology
Shun Xu
Hunan Hydro & Power Design Institute
Shuguang Deng
Hunan City University
Rui Chen
Electric Power Research Institute of Guangdong
Power Grid Corporation
Hongjie Weng Electric Power Research Institute of Guangdong
Power Grid Corporation
Leisisi He
Changsha University of Science and Technology
Yancun Cai
Changsha University of Science and Technology
Wen Wang
Changsha University of Science and Technology
In China, the method of neutral resonant grounding and neutral ungrounded are widely used in distribution networks.
When grounding fault occurred in distribution network, the
fault current is small, and vulnerable to the outside interferences, so the fault features are difficult to be detected. To solve
this problem, a new method of fault section location based on
intrinsic mode function (IMF) energy moments and least
squares support vector machines (LS-SVM) was proposed.
Firstly, the fault current signals were decomposed into several
IMFs based on ensemble empirical mode decomposition(EEMD), then the fault feature vectors of IMF energy
moments were obtained by integrating the IMF components
with time. Secondly, the IMF energy moments with high correlation coefficients were taken as learning samples, then they
were inputted to LS-SVM classifier to obtain fault selection
location model. Finally, the unknown fault samples were inputted to the LS-SVM classifier trained before to achieve fault
section location results. The simulation results show that this
method can recognize features of fault signals accurately and
identify the fault sections correctly.
Three-phase voltage unbalance is frequently encountered in
neutral ineffectively grounded distribution systems, which
affects the normal operation and power quality of power system. This paper proposed a novel method to restrict the unbalance by means of injecting a current to the neutral point.
The injecting current is used to compensate the grounding
1current and then force neutral voltage to zero and
three-phase voltage to balance as well. An inverter is connected
between the neutral point and the earth through a transformer
to produce the injecting current. By controlling the inverter,
the amplitude, phase and frequency of injecting current can be
controlledflexibly. A 10kV distribution system model was built
in MATLAB for analysis. The simulation results indicate that
theproposed method can restrain the three-phase unbalance
voltage efficiently and rapidly.
Tu B03.73
Tu B03.71
Application of Beidou Satellite T iming and
Injecting current control method for 3-phase
unbalanced voltage suppression in distribution
system
pp. 1214-1219
Communication Technology in Power System
Fault Location
pp. 1224-1230
Leisisi He
Changsha University of Science and Technology
Feng Zhou
Changsha University of Science and Technology
Wen Wang
Changsha University of Science and Technology
Xiangjun Zeng Changsha University of Science and Technology
Qingling Wang
Maoming Power Supply Bureau of Guangdong Power Grid Corporation Limited
Lei Shu
Changsha University of Science and Technology
Honghui Chen
The asymmetry of system parameters and electric loads lead to
three-phase voltage unbalance in neutral resonance grounded
distribution networks, which causes damages to the electrical
equipment and power system. This paper proposed an unbalanced voltage limiting method by injecting a zero-sequence
current to the neutral point of distribution network through an
active inverter, and studied the controlling strategy of the injecting current with a proportional resonant (PR) controller.
Maoming Power Supply Bureau of Guangdong Power Grid Corporation Limited
Xiangjun Zeng Changsha University of Science and Technology
Huan Ye
Maoming Power Supply Bureau of Guangdong Power Grid Corporation Limited
Juntao Zhou
59
Maoming Power Supply Bureau of Guang-
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
coil has been studied.
dong Power Grid Corporation Limited
Feng Deng
Changsha University of Science and Technology
Tu B03.75
In order to improve the accuracy of time synchronization and
the reliability of data communication in power system fault
location, a new Beidou satellite based timing and communication technology applied to power fault location system using
traveling wave is designed in this paper. Principle1of Beidou
timing was firstly analyzed. Considering the disadvantages and
advantages of one-way and two-way timing style in Beidou, a
new combinational timing scheme based on Beidou satellite
system was proposed. Then, through the deep analysis of basic
principle of communication, two-way short message communication of Beidou Satellite was proposed and the corresponding communication protocol was made. Eventually, traveling
wave based fault location system using the technology of Beidou satellite timing and communication in transmission lines is
preliminarily designed. Simulation and test results show that
the presented scheme can be applied to fault location system
absolutely, which can provide high accuracy of time synchronization for the system, and improve the location accuracy. It
also could ensure the high reliability in Beidousystem using
short message communication, which no longer need other
data transmission access. in that case, it would save the construction cost of power grid communication greatly.
Realization and Performance Analysis of Travelling Wave Based Directional Protection Prototype
pp.1236-1239
Xinzhou Dong
Tsinghua University
Shenxing Shi
Tsinghua University
Bin Wang
Tsinghua University
Beijing Electric Power Company
Travelling wave based protection is becoming attractive in
ultra-high voltage (UHV) transmission systems due to the requirement for high-speed protection. However, the poor transfer characteristics of coupling capacitor voltage transformers
(CCVTs) for high-frequency voltage have strictly limited its
application. A travelling wave based protection prototype considering the characteristics of CCVTs is developed in this paper. Extensive laboratory tests are performed to assess the
performance of the developed prototype. Further, the prototype has been applied in the 750 kV substations in China and
an external fault was recorded during the operation period,
validating the effectiveness and reliability of the proposed prototype.
Traveling Wave Detection Principle Based On
PCB Traveling Wave Sensor
pp. 1231-1235
TuB04.1
A Novel Control Strategy for Static Excitation
Electric Power Research Institute of Guang-
System Based On Three-phase Current Source
dong Power Grid Co., Ltd.
Yuan Zhang
Shuxin Luo
Shiyong Wang
Tu B03.74
Yi Wang
Tsinghua University
Converter
Electric Power Research Institute of
pp.1240-1245
Guangdong Power Grid Co., Ltd.
Kexin Rui
Yuhao Zhou
Changsha University of Science and Technology
Chengxiong Mao
Xiangjun Zeng Changsha University of Science and Technology
Yiran Jiang
Jian Zhang
Huazhong University of Science and Technology
Huazhong University of Science and
Technology
Changsha University of Science and Technology
Electric Power Research Institute of Guang-
Zhu Chen
Huazhong University of Science and Technology
dong Power Grid Co., Ltd.
Jiming Lu
Huazhong University of Science and Technology
Dan Wang
Huazhong University of Science and Technology
Traveling Wave Detection is the core problem in traveling
wave fault location. Existing traveling wave detection methods
could be mainly divided into current traveling wave detection
and voltage traveling wave detection. Considering the existing
current traveling wave detection is complex and costly, the
existing voltage traveling wave detection is inconvenient to
install, a PCB traveling wave sensor based on Rogowski coil
has been proposed in this paper which could detect faults of
the power system by abstracting substation secondary signal
directly. The structure of PCB traveling wave sensor was analyzed, the transfer function and frequency characteristics of
the high-frequency transient signal extracted from Rogowski
November 26-29，2015 Changsha，China
In modern power system, increasing pressures of system stability have become more and more serious. Because excitation
systems are one of the most effective and economical ways
contribute to effective control of voltage, increasing attention
has been focused on the effects of excitation control. To satisfythe needs of modern power system, excitation system based
on full-controlled devices is proposed to be used in synchronous generator excitation, and a new decoupled control technique is adopted to design a controller for current source converter based excitation system in this paper. Then, the modified Heffron-Phllips mathematical model of synchronous gen-
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
erator based on this new type of excitation system is discussed,
which helps to explicate the principle of reactive power injector in the new excitation system and its design strategy. Also,
the crucial function of reactive power injector that could provide more damping to the system is explained. The simulation
results are presented to demonstrate the correctness and effectiveness of the proposed approaches, and its advantage over
the conventional excitation system.
proposed model and method. The simulation results show that
voltage regulation is proved to be a good solution to increase
the maximum penetration of DG, but a compromise must be
made between higher penetrations of DG and fewer adjustments of voltage regulation devices. This will have major implications for the development of DG in SDG.
TuB04.4
TuB04.2
AC/ DC Hybrid Micro Grid Voltage Recovery
Control
pp. 1256-1260
Hybrid PV-VSDG and stabilizing DC-Voltage bus
Using SMES
pp.1246-1250
Bashar Sakeen Farhan
Huazhong University of Science and
Technology
Shaorong Wang
Huazhong University of Science and
Jinxiang Liang
China Electric Power Research Institute
Yu Ji
China Electric Power Research Institute
Wenhua Wu
China Electric Power Research Institute
Jing Cao
China Electric Power Research Institute
Jing Li
China Tianchen Engineering Corporation
Technology
Hasan Wahhab Salih
AC/DC hybrid is a kind of structure forms of mi- cro grid, to
supply AC load and DC load. In order to realize the uniform
distribution of DC power between AC converters, im- prove
the DC bus voltage quality; this paper introduces a hierarchical AC converter control strategy. The first layer is the DC
voltage-active power droop control method to realize the uniform load distribution; considering that droop control will lead
to fall of the DC bus voltage, the second layer control method
compen- sate voltage reference value of DC bus, to realize the
recovery of bus voltage, and ensure the quality of the DC bus
voltage. In this paper, control methods are analyzed by the root
locus method, and the micro grid model is built based on the
simulation of soft-ware DIgSILENT, to validate the control
strategy.
Huazhong University of Science and
Technology
In this paper an energy system topology consisting of a variable speed diesel generator (VSDG), PV using MPPT and single
inverter is presented and considered to provide energy to an
isolated load at constant frequency and voltage. SMES is utilized to maintain DC-voltage bus steady during the unbalanced
power between generating power of (PV-VSDG) and load demand by releasing (or absorbing) the power difference until
the system delivered the required power to the load. The
PVVSDG and SMES is modeled in MATLAB/SIMULINK and
simulation tests are carried out to verify the function and performance of the system.
TuB04.5
TuB04.3
Study of Out-of-step Oscillation Characteristics
forEast China Grid and Applicability Analysis of
SystemSeparation Scheme upon the Operation
of UHVBinjin DC Transmission Project
Increasing Maximum Penetration of Distributed
Generation by Voltage Regulation in Smart Distribution Grid
pp. 1251-1255
Shanshan Zhao
pp. 1261-1266
China Electric Power Research Institute
Xiaoli Meng
China Electric Power Research Institute
Yun Su
State Grid Electric Power Research Institute
Xiaohui Song
China Electric Power Research Institute
Naiwang Guo
State Grid Electric Power Research Institute
Yinghui Yu
State Grid Electric Power Research Institute
Lei Huang
State Grid Electric Power Research Institute
Hao Chen
State Grid Electric Power Research Institute
With the increasing pressures on energy conservation and
emission reduction, the urgent need arises to increase the
maximum penetration of distributed generation (DG) without
violating the voltage limits. This paper proposes a twodimensional multi-resolution model of smart distribution grid (SDG)
to analyse dynamic changes of DG and load at first. And then
based on the model, an analytical methodology is presented to
determine and increase the maximum DG penetration without
voltage violations by voltage regulation. IEEE Comprehensive
Test Feeder is used to prove the feasibility and validity of the
Fujian provincial grid was connected into East China grid
through two parallel tie lines of 500kV in 2002. Out- of-step
oscillation may occur between Fujian Province Grid and East
China grid under the critical contingencies. System separation devices have been installed on 500kV tie-lines between Fujian grid and East China grid to maintain system stability. As
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
the newly built UHV Binjin DC transmission system was projected to come in service in 2014, power injected into East
China grid through the system was gradually increased to its
full capacity in accordance with the implementation of the
project by three stages. The characteristics of out-of-step oscillation between Fujian grid and East China grid may be altered
due to the significant changes involving tie lines, reinforcement
and reconfiguration of local system as well as the scale of power injection. To investigate the characteristics of out-of-step
oscillation, extreme contingencies contributing to out-of-step
oscillation are identified based on the analysis of the practical
grid operation. For each stage of Binjin transmission project,
the center of out-of-step oscillation is determined through the
simulation analysis of the oscillation characteristics for East
China grid. The applicability of the existing system separation
devices is evaluated, and system separation strategy is then
reviewed for East China grid to accommodate the operation of
UHV Binjin DC transmission project.
on Displacement Voltage Method
pp. 1273-1277
Jie Zhou
State Grid Jiangsu Economic Research Institute
In order to make sure the best compensation for the grounding
fault current, neutral resonant grounding mode via the arc
suppression coil is widely used in medium and low voltage distribution network in our country. The key problem is measuring the phase-to-ground capacitance accurately online. Displacement voltage is a method of measuring the
phase-to-ground capacitance indirectly. Choosing the suitable
inductive reactance is very important to calculation accuracy.
The model of neutral resonant grounding is established with
the simulation software in this paper. The inductive reactance
and the displacement voltage corresponding to reactance are
recorded. This paper used non-linear regression method to fit
the multinomial between displacement voltage and the reactance. The resonance point can be determined to get the suitable reactance for capacitance calculation. It can improve the
calculation accuracy and reduce the error.
TuB04.6
Mechanism Analysis on Instability caused by
Multiple HVDC Power Drop of Multiple Sending
HVDC Systems
TuB04.8
Jingzhe Tu
China Electric Power Research Institute
Jian Zhang
China Electric Power Research Institute
Condition Assessment of Gas-Insulated Switchgear Based on Multiple Information
pp. 1278-1282
Junchuan Jia
China Electric Power Research Institute
Honghua Xu
Jiangsu Nanjing Power Supply Company
Qiang Yu
China Electric Power Research Institute
Chunning Wang
Jiangsu Nanjing Power Supply Company
pp. 1267-1272
As the high-voltage direct current (HVDC)s with large capacity are continually being commissioned, the “strong DC and
weak AC” characteristic of the power gird is furtherly being
presented, the influence of the multiple sending HVDC system
on the stability of the interconnected power system is becoming
significant. In this paper, the HVDC power drop characteristic
caused by contingencies of the sending-side system is analyzed,
on the base of the three-area AC/DC equivalent model, the
impact of the multiple HVDC power drop on the stability of
the interconnected system under different power flow directions is analyzed, and the single HVDC blocking is taken to be
compared. Finally, the results are verified by the “North China-Central China-East China” power grid case system. The
results show that the instability mode of the sending-side system caused by the multiple HVDC power drop is the
first/second angle instability, the severity of the impact of
which on the sending-side system stability is close to that of the
single HVDC blocking, and further study on the effective
counter-measures is quite necessary.
Taoyun Wang
Hohai University
Lanying Yang
Hohai University
Hongzhong Ma
Hohai University
Condition assessment of gas-insulated switchgear (GIS) is an
important approach to provide decision-making for condition
maintenance which improves the operation reliability of power
systems. Indices system of operation condition assessment for
GIS is established according to its operation condition which is
related to quite a few factors. A part of the factors is vague.
Constant weight is determined by the interval analytic hierarchy process while variable weights are obtained by using entropy method to correct constant weight, which improving the
accuracy of the condition assessment. The correlation function
of each index is constructed by using extension theory. The
status level and the corresponding GIS’s maintenance strategies based on the relationship between function values, the note
value and warning value are specified by the procedures. Example analysis shows that condition assessment of GIS based
on a variety of information is more rational and effective.
TuB04.7
TuB04.9
Measuring Phase-to-ground Capacitance Based
Identification of Critical Lines in Power Grid
Based on Active Power Flow Betweenness
November 26-29，2015 Changsha，China
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
pp. 1283-1287
pp. 1294-1298
Xiaowei Sun
Three Gorges University Yichang
Yude Yang
Tao Zhang
Three Gorges University Yichang
Xiujun Qin
Bin Zhang
Three Gorges University Yichang
Wentai Liu
Guangxi University
Jian Yang
Guangxi University
It is an important part for the power system operation risk
control to identify the critical lines. To improve the
iden-tification accuracy, the indicator of active power flow
betweenness is proposed in this paper. The actual distribution
of the power flow and the capacity of each transmission line
are involved in the model which is more comprehensible to the
physical backgrounds of power system. At the same time, the
effectiveness of the identification results is verified by the
changes of system transmission efficiency that proposed in the
paper with the out- age simulation and cascading failure of the
critical lines. The experiment on IEEE-118 bus system shows
that a few lines with high active power flow betweenness play a
vital role in the power grid. Continuous attacks on these lines
lead to a sharp decline in the level of the power transmission
efficiency. Thus, it is effective to identify the critical lines in
power grid by using the active power flow betweenness.
A Novel GA-PI Optimized Controller for MPPT
Based PV in a Hybrid PV-Diesel Power System
pp. 1288-1293
Shaorong Wang
Shaorong Wang
Guangxi University
Modern power system is getting larger and complicated. Once
it comes an accident, engineers need to make decision in a very
short time which is a huge challenge for them. Thanks to the
development of computer network and electrical equipment,
nowadays power system has been achieved the goal of information resources sharing. The small-signal stability problem
has been getting attention because of the occasional oscillation.
Though numbers of measures are taken into account to enhance the small-signal stability, sometimes it would not help.
Based on this actuality, this paper prospect a new method that
can increase small-signal stability by adjusting power flow. The
model considered small-signal stability constrained-optimal
power flow(SSSC-OPF) by adding small-signal stability index
into the OPF model. In fact, it does not substitute any other
existing controller actions, but rather provides limited generator adjustment to obtain the required stability margin. By getting the real-time operation data from database, analyzing and
forming into the specific format we need. Then calculating the
power flow and smallsignal stability of the current point. If the
stability index is not met, the algorithm will optimize the active
power output until the damping ratio is high enough. Numerical simulations for two systems confirm the validity of the
method and the robustness of the algorithm, so that can be
widely used in practical system.
TuB04.10
Hasan Wahhab Salih
Department of Electrical Engineering Nanning
Huazhong university of Science and
Technology
Huazhong university of Science and
Technology
Huazhong university of Science and
Technology
TuB04.12
Quantitative Analysis and Optimization of Primary Frequency Characteristic in Isolated Power
Gr i d
Because of the intermittency of output PV power, the authors
have developed and implemented the Perturb and Observe
(P&O) MPPT technique using genetic algorithm (GA) to tune
and obtain the optimum parameters of the PI controller for the
standalone PV-diesel hybrid power system. This PI controller
regulates the output of boost converter for PV system. The
results of this control technique are compared with the conventional P&O MPPT technique that is based on PI trial and
error method for the same system. The proposed novel controller has improved the dynamic response of PV system output power and the voltage oscillation damping. Another reason
to design this proposed controller is because the fluctuating
power causes frequency deviation in the power system, so the
controller also reduces the frequency deviation of the
standalone PV-Diesel hybrid power system in term of rise time
and maximum overshooting during any fluctuation of PV insolation. The whole system is implemented by using
MATLAB/Simulink Environment using actual solar radiation
data. The simulation results show the effectiveness of the proposed controller.
pp. 1299-1304
Zhiyuan Qi
North China Electric Power University
Shiwu Xiao
North China Electric Power University
Fei Li
North China Electric Power University
Primary frequency regulation of isolated power grid is significantly different with large power system. In this paper, based
on the frequency change of isolated power grid, mathematical
expressions of a dynamic process of primary frequency regulation are derived. And then mathematical expressions of the
maximum frequency deviation, maximum rate of frequency
change and static frequency deviation are got. The influence on
the primary frequency regulation by generator frequency coefficient, the ratio of generator participating in primary frequency regulation, the generator inertia time constant, and the
governor time constant is analyzed. Optimization method of
primary frequency regulation by adding the acceleration feed
forward is proposed. The method, which equals to increasing
the system inertial time, reduces the maximum frequency
change rate and the maximum frequency deviation. At last, the
TuB04.11
Small-signal Stability Constrained Optimal Power Flow Based on Real-time Data
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
validity of this method is verified by the simulation of an isolated power grid.
measures are used up to obtain the optimized voltage. It proves
the typical heterogeneous scale-free network features of power
grid and uses electric coupling degree to identify the key substations which own the closest connections with other buses in
the network, according to the results, changing corresponding
backup lines from hot-spare into cold standby mode. Compared with circuit break depend on experiences in actual production, the proposed method has obvious advantage of improving the net-wide voltage with the least cut of backup lines,
which is physical well-defined and convenient. The simulation
results of practical grid validate the proposed strategy and
show the effectiveness of optimizing the net-wide voltage profile which possess of good application prospects.
TuB04.13
New Passivity Design for the Excitation and
Steam-Valving Control of Synchronous Generators
pp. 1305-1310
Tianbai Deng
North China Electric Power Univ.
Yinsong Wang
North China Electric Power Univ.
Xiaohe Qu
North China Electric Power Univ.
TuB04.15
This paper presents a new passivity design for the excitation
and steam-valving control of synchronous generators. Different from conventional control method, the proposed control
considers the steady-state error of active power and reactive
power supporting capability of the generator. Based on the
five-order nonlinear model with two inputs, steam-valving
control is designed by backstepping method at first to ensure
the angle stability, and then excitation control is achieved by
using the passivity approach incorporating the high side voltage control technique. When design the controller, two integrators are added in the differential equations to reduce the
steady-state error. And the step up transformer reactance is
compensated in design, so the excitation control is optimized to
sustain a high level voltage.The simulation shows the approach
has strong positive impact on the performance of active and
reactive power of the generator.
An Emergency Load Shedding Algorithm
pp. 1316-1320
TuB04.14
TuB04.16
State Grid Electric Power Research Inst.
Ming Tang
State Grid Electric Power Research Inst.
Hua Zhang
State Grid Electric Power Research Inst.
Wenbin Hao
State Grid Electric Power Research Inst.
Min Liu
State Grid Electric Power Research Inst.
Kun Li
Baohui Zhang
Xi’an Jiaotong Univ.
China Electric Power Research Inst.
A new emergency load shedding algorithm is proposed in this
paper based on the state plane representation of generator
speed and power angle. When the trajectory of the power system stays in concave regions, the system is stable. When the
trajectory crosses though the convex regions, the system is
detected as unstable state. Based on the characteristic of the
trajectory, a load shedding algorithm is proposed in this paper
when active power is insufficient in receiving end. The proposed method was successfully tested in a single machine infinite bus system.
Nonlinear Dynamic Analysis and ZnO-based
Suppression of Ferroresonance Overvoltage in
Distribution Network
pp. 1321-1325
Ye Zan
Wang Qian
Jiandong Duan
Wangjing Tan
Xi’an Univ. of Tech.
Xi’an Univ. of Tech.
Xi’an Univ. of Tech.
Xi’an Univ. of Tech.
Ferroresonance overvoltage that is caused by saturation in
electromagnetic type voltage transformers occurs frequently.
In order to avoid interference from ferroresonance overvoltage
in the safe operation of a power system, it is a to study a reliable and stable resonance elimination measure.Firstly, different
types of ferromagnetic resonances are obtained with the different ratio of capacitive reactance and inductive reactance.
Thereafter, nonlinear dynamics research method is used to
analysis the effect of inhibiting ferroresonance in ZnO nonlinear resistance grounding mode. Finally, the method is verified
by ATP-EMTP. The results show that the voltage amplitude of
the neutral point through nonlinear resistance falls under
State Grid East Inner Mongolia Electric Power Company Hohhot
To avoid 110kV distribution network bus voltage conducting
above the over-limit during holidays especially in the Spring
Festival, a new voltage regulation method based on electriccoupling degree is introduced. The strategy takes example by
circuit breaks in practical operation and accordingly alters key
backup lines’ connection modes under the restraint of line
thermal stability, transformer capacity and switching power
flow on boundary when traditional voltage regulation
November 26-29，2015 Changsha，China
Xi’an Jiaotong Univ.
Dezhi Chen
A New Approach to 110kV HV Distribution Grid
Voltage Control Based on Coupling Numerical
Analysis
pp. 1311-1315
Xiaoxu Wang
Huaiyuan Wang
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
multi-objective model which considers the difference of the
objectives’ importance is proposed. To get the most preferred
alternatives, a non-r-dominance sorting genetic algorithm II
(r-NSGA-II) is used to solve the model. The reference point
determination method and solution set scale controlling method are proposed to improve the algorithm, which makes the
solution set scale controllable and the preference to be better
expressed. Simulation results show that the proposed method
has practical value when solving the generator start-up problem for network reconfiguration.
normal circumstances and chaotic phenomena is eliminated.
The results imply that the suppression measure can well inhibit
ferroresonance overvoltage.
TuB04.17
A General Adaptive Multi-Segment Strategy for
Transient Stability Constrained Optimal Power
Fl o w
pp. 1326-1331
Jian Yang
Guangxi Univ.
Hua Wei
Guangxi Univ.
Xiujun Qin
Guangxi Univ.
Chunmei Lin
Guangxi Univ.
TuB04.19
The Load Oscillation Energy and Its Effect on
Low-Frequency Oscillation in Power System
pp. 1336-1341
In view of the low computational efficiency and large memory
occupancy in conventional numerical discretization algorithms
for transient stability constrained optimal power flow
(TSCOPF), this paper presents a general adaptive multisegment strategy, which could be applied to various numerical discretization algorithms. Based on the error analysis with
implicit trapezoidal method (ITM) as an example, a multi-segment simultaneous strategy is put forward in light of the
discontinuity of power network parameters before and after
fault clearing; Furthermore, in view of the fact that excessively
high accuracy of swing angle is unnecessary in engineering
practice, an adaptive accuracy control strategy is put forward.
The strategy proposed above could not only improve the accuracy of the conventional method, but simply need to calculate
once to obtain the desired integration step within any accuracy
limitation, thus avoiding large number of unnecessary computation burden by using adaptive rather than unified integration step size for different problems. The results of 5 test systems, such as 703-bus system, indicate that compared with the
conventional ITM, the proposed strategy could limit the deviation between control accuracy and actual accuracy within the
range of ±1 degree, and improve the computation speed by
2-20 times, which shows promising application prospects.
A r-NSGA-II Algorithm Based Generator Start-up
for Network Reconfiguration
pp. 1332-1335
Shandong Univ.
Hainan Zhu
Shandong Univ.
Yutian Liu
Shandong Univ.
Hohai Univ.
Yaling Shen
Hohai Univ.
Xiang Zhang
Hohai Univ.
Jiyun Zhu
Hohai Univ.
Jiajia Du
Hohai Univ.
Low frequency oscillation is a potentially dangerous phenomenon in power systems involving exchange of power among
generators and loads in different areas. The study of the low
frequency oscillation mainly concentrated on the analysis and
control of generator in the past. As important parts of power
system, loads have a significant effect on the low frequency
oscillation of the interconnected power system. In this paper,
we study the effect of load to the low frequency oscillation by
analyzing the characteristic and distribution of the load oscillation energy. Firstly, the equations of the load oscillation energy are introduced, which derived from the linearization of
system dynamic equations. Then, based on the load oscillation
energy, the distribution of the oscillation energy in a variety of
static loads and internal induction motors is analyzed in a single-machine infinite-bus system. Different kinds of load have
different effects on low frequency oscillation. Moreover, in the
interconnected 4-generator 2-area system with weakly damped
free oscillation, the oscillation energy distributions of the different kinds of load at different locations, as well as different
induction motor load capacity ratio are analyzed. Finally, the
effect of load characteristics on the low frequency oscillation is
summarized from the perspective of oscillation energy.
TuB04.18
Runjia Sun
Yiping Yu
The objective of power system restoration is to restore the load
as soon as possible ， while the successful start-up of generator
is the precondition of load recovery and the emphasis of power
system restoration. In this paper, both the generator start-up
sequence and the restoration path are considered. A preference
TuB04.20
Dynamic Stability Analysis of the Interconnected
Power System with Mengxi UHVDC Integration
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
tions of resonant oscillation and beat frequency oscillation.
Lastly, differences in frequencies and damping ratios of components forced power oscillation are analyzed and used for
criteria for discriminating forced power oscillation from free
power oscillations. Simulation results of the New England test
system demonstrate the effectiveness of the forced power oscillation response analysis.
pp. 1342-1345
Mei Li
Huazhong Univ. of Science and Tech.
Ni Zeng
Huazhong Univ. of Science and Tech.
Yuanfang Zeng
Huazhong Univ. of Science and Tech.
Shuang Zhao
Huazhong Univ. of Science and Tech.
Pei Bie
Huazhong Univ. of Science and Tech.
Jiasi Wu
Huazhong Univ. of Science and Tech.
Hang Li
Huazhong Univ. of Science and Tech.
Ruoxi Zhu
Huazhong Univ. of Science and Tech.
Buhan Zhang
Xu Zheng
TuB04.22
Huazhong Univ. of Science and Tech.
State Grid Hubei EconomicResearch Inst.
Real-time Transient Instability Monitoring and
Determination for Large-scale AC/DC Interconnected Power System Using Synchronized Phasor
Measurements
pp. 1351-1357
Due to the mismatch between power supply and demand, in
addition with the increasingly prominent problem of environmental pollution, UHV AC/DC power transmission overlong
distance obtains rapid development in our country. With the
expansion of the power grid, regional low frequency oscillation
has become one of the major problems that endanger safe and
stable operation of power system. In this paper, taking a
large-area interconnected system integrated with Mengxi
UHVDC transmission line as the background, dynamic stability of the system is analyzed using small signal analysis method
and time-domain simulation based on PSASP under different
load and UHVDC operating conditions. The results show that
when DC out of running, weak damping will appear in the
interconnected power grid. PSS is the most economical and
effective equipment for damping low frequency oscillation,
which can perform well to both the local mode and the inter-area one. In view of the existing weak damping mode, PSS
parameters are optimized which effectively improve the system
damping, thus insuring the safe and stable operation of the
system after the UHVDC line access.
Wei Wu
Electric Power Research Inst. China Southern Power
Grid
Hong Rao
Electric Power Research Inst. China Southern Power
Grid
Chao Hong
Electric Power Research Inst. China Southern
Power Grid
Yongjun Liu
Electric Power Research Inst. China Southern
Power Grid
In this paper, a real-time transient instability detection system
is proposed to determine the transient instability using
wide-area phasor measurements. The proposed system incorporates determination of oscillation tie lines and real-time
transient instability detection. Oscillation tie lines can be identified immediately after the system being subjected to a large
disturbance according to the coherent groups of generators
and system network topology. Then, system transient state is
evaluated by a novel criterion in real-time with the crucial
measurements. The used measurements during the
post-disturbance are extracted from the huge number of PMUs
data updated timely and can represent the transient status of a
system. The proposed approach is examined on a practical
AC/DC interconnection power system. The obtained results
indicate the efficiency of the transient instability detection system for determining the transient unstable status.
TuB04.21
Response Analysis and Type Discrimination of
Power System Forced Oscillation
pp. 1346-1350
Dong Yang State Grid Shandong Electric Power Research Inst.
Luhua Xing State Grid Shandong Electric Power Research Inst.
Liang Wang Shandong Electric Power Dispatching and Control
Center
Hua Ye
Shandong Univ.
Yutian Liu
Shandong Univ.
TuB04.23
Mechanism and countermeasures for free power oscillation
and forced power oscillation are different. The key to suppress
them is to locate, discriminate, and then take effective
measures. In this paper, an explicit expression for forced power
oscillation response of a multi-machine power system is firstly
obtained. Simplifications are then made by using the condi-
November 26-29，2015 Changsha，China
Nonlinear Oscillation Description by Swing Energy Sequence of the Controlling Mode
pp. 1358-1362
66
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Qinglong Liu
Nanjing Univ. of Science and Tech.
Yusheng Xue
State Grid Electric Power Research Inst.
Qi Tao
Zhen Wang
Zhejiang Univ.
Xin Xu
Shandong Univ.
Hengxu Zhang
Shandong Univ.
Yun Chai
Zhejiang Univ.
Shandong Univ.
Fang Shi
Shandong Univ.
Zijun Bin
Shandong Univ.
Zhaowei Li
NARI Group Corporation
Tiangang Huang
Southeast Univ.
Wei Li
NARI Group Corporation
This paper presents a method to describe nonlinear oscillation
of power system. Specifically, this paper uses the controlling
mode which is identified by the extended equal-area criterion
(EEAC). The energy of center equal point (CEP) or far end
point (FEP) in each swing is used to express the oscillation
energy of the controlling mode, so the trend of swing energy
variations can be used to show the behavior of the nonlinear
oscillation. In addition, the rationality of the method is analyzed and proved by the simulation results.
Huge power transmitted over long distance through some crucial lines increases the probability of a sudden loss of bulk
power in the power-receiving system. To prevent such emergency from deteriorating the security of the system, an emergency load shedding model, whose objective is to minimize the
total load shedding cost, is built, and then an efficient algorithm is proposed based on trajectory sensitivity. The constraints of the model include transient voltage security, transient frequency security and available load that can be shed.
This problem is a large scale, nonlinear programming problem
with constraints considering time-varied parameters. The
mathematical model is simplified by linearizing the security
constraints through trajectory sensitivity, and the consistency
of the solution is guaranteed by iterative calculation. The trajectory sensitivity is utilized in guiding the search direction and
accelerating the solving process. A provincial power system is
used to test the validity of this algorithm.
TuB04.24
Dynamic Performance Comparison of Different
Controlled Islanding Methods
pp. 1363-1367
Tongxiao Wang
Shandong Univ.
Lei Ding
Shandong Univ.
Shanyao Yin
Shandong Univ.
Jingli Liu
Shandong Univ.
Yingzhe Jia
Shandong Univ.
Daonong Zhang
TuB04.26
WAMS Light and Its Deployment in China
pp. 1373-1376
North China Power Engineering Co.LTD
Controlled islanding can be used as an efficient emergency
action to prevent blackouts. Steps of controlled islanding
methods implementing include graph modelling, objective
function establishing, and the splitting solution finding. Researchers now concern about static constraints such as reactive
power compensation and restoration capability when
solving the objective function, but few papers have analyzed dynamic performance of splitting algorithms comprehensively.This paper investigates detailed dynamic responses with
three typical methods: a) Ordered Binary Decision Diagram
(OBDD), b) Weak Connection and c) Spectral Clustering islanding. To compare their differences, this paper separates the
responses creatively into two phases from the perspective of
time. In the first phase, characteristics of oscillations among
generators and duration of transient process are taken into
consideration. Maximum frequency shift and steady frequency
shift in the second phase are compared then. Feasibility of different splitting solutions are also analyzed to compare the
three methods. Time domain simulation of IEEE 118 case is
carried out with PSS\E.
Zongshuai Jin
Shandong Univ.
Hengxu Zhang
Shandong Univ.
Changgang Li
Shandong Univ.
It is determined by the nature of AC power grid that the disturbance in high voltage power grid can be reflected in low
voltage power grid to some extent. The idea of the light synchronized phasor measurement unit (PMU Light) and that of
the light wide-area measurement system (WAMS Light) was
proposed and implemented in low voltage grid. Comparing the
data recorded by WAMS and that recorded by WAMS Light, it
is clear that the dynamic responses in high voltage power grid
and low voltage power grid are strongly correlated. WAMS
Light has already recorded several typical large disturbances.
So WAMS Light has a broad application prospect in many
fields. It also enlightens scholars to dig the value of the dynamic behavior of low voltage grid, the grid measurement theory, and even the way of the decentralized control of the power
system.
TuB04.27
TuB04.25
Analysis on the Influence of Rotational Inertia
Level of Sending System on Transmission Capability
Trajectory Sensitivity-Based Emergency Load
Shedding Optimal Algorithm
pp. 1368-1372
67
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
ing on the mid-long term voltage stability problem. The prediction horizon and the evaluation target node are firstly determined based on the predicted system trajectory. Considering the control rate constraint, the maximum voltage recovery
amount with the current optimization steps is evaluated according the voltage response feature, based on which the voltage regulation limit index is formulated. The control horizon
parameter is then determined according to the voltage regulation limit index, which is able to adjust itself according to the
system operating state during the optimization process. The
validation and effectiveness of the proposed method are verified by the simulation results of the New England 39-node system.
pp. 1377-1380
Chao Zheng
China Electric Power Research Inst.
Huiling Li
China Electric Power Research Inst.
Tian Miao
North China Electric Power Univ.
Jingmin Zhou
North China Electric Power Univ.
It is an effective approach to improve utilization efficiency of
primary energy source, to enhance security and stability margin of power grid and to lift overall operational efficiency of
power grid via increasing transmission capability of power
grid. During the initial period and the transitional period of
power grid construction, in view of the impacts of techno-economy, implementation scheduling of the project, difference of seasonal power generation capacities, generally, there
exists a circumstance that the outward transmission capability
of power source is restricted by transmitting capacity of power
grid. At first, it is analyzed that the influences of rotational
inertia level of generators at sending end on both accelerating
energy accumulation of rotors during fault period and the
maximum decelerating energy that provide by power grid after
cleaning up the fault, which is based on equal area criterion,
and the mechanism of enhancing outward power transmission
capacity by increasing rotational inertia of generators is revealed. On this basis, it is researched that the impacts of generation scheduling of Laohuzui main power plant in Tibet’s
Nyingchi power network which transmits power outwards on
disturbed trajectory of tie line and outward transmission capability, and it is pointed out that with the weak interconnection of Nyingchi power network with Tibet power grid via single circuit transmission line ， it is an effective technical
measure to improve outward power transmission capability
and enhance security and stability margin by optimizing generation scheduling and increasing rotational inertial.
TuB04.29
Index System and Methods for Subtransmission
Grid AVC Assessment
pp. 1387-1393
Li Min
Zhang Bei
State Grid Sichuan Electric Power Company
Lu Yi
State Grid Sichuan Electric Power Company
Junyong Liu
Sichuan Univ.
Xiaodong Shen
Sichuan Univ.
Lixiong Xu
Sichuan Univ.
Zhenghua Jiang
Sichuan Univ.
Given the lack of a quantitative evaluation method, the paper
presents a hierarchically structured method on the evaluation
of sub-transmission grid AVC. The evaluation method and
implementation steps are proposed, including the performance
indices and the evaluation method. For index, some of it including voltage qualified rate, network loss rate and voltage
stability has long been familiar to all. When it comes to method,
AHP(analytic hierarchy process) and weighted evaluation has
been developed and used for years. The current AVC system in
DeYang city, China is evaluated using a set of comprehensive
evaluation index and the application of fuzzy synthetic evaluation method. The result of the evaluating system including
single strategy result and AVC operation result, in specified
ratings. The numerical example indicates the reliability of this
evaluation system.
TuB04.28
Adaptive Model Prediction based Optimal Coordinated Voltage Control
pp. 1381-1386
Yan Zhang State Grid Shandong Electric Power Research Inst.
Wen Zhang
Shandong Univ.
Gaofeng Zhang
State Grid Shandong Electric Power
Research Inst.
Qingyu Wang
State Grid Shandong Electric Power
Research Inst.
Qingqing Zhang
State Grid Shandong Electric Power
Research Inst.
Maolin Li
State Grid Jinan Licheng Power Supply Company
In traditional model prediction based optimal voltage control
method, the control horizon and prediction horizon parameters need to be determined offline using experience or enumeration, and keep constant during the whole optimization process,
which may cause negative influence to the control performance.
Aiming at this problem, an adaptive model prediction based
optimal coordinated voltage control scheme is proposed focus-
November 26-29，2015 Changsha，China
State Grid Sichuan Electric Power Company
TuB04.30
Multi-objective Optimization of Current Limiting
Scheme Considering Constraint Conditions
pp. 1394-1399
68
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Lines
Yahui Chen
Shandong Univ.
Bo Zhang
Shandong Univ.
Zhiyuan Pan
State Grid of China Tech. Coll.
Hong Zhang
Renfei Che
The multi-objective optimization of current limiting scheme
for power system is a complex, nonconvex and nonlinear problem and it is more complex when considering constraint conditions. Aiming to minimize total investments and short-circuit
capacity margin under constraint conditions, a multi-objective
optimization model of current limiting scheme based on the
fast and elitist non-dominated sorting in genetic algorithms is
presented. In order to increase the iterative rate, penalty coefficient is changed from zero to the maximum during the iterative process. Moreover, the influence on impedance matrix
caused by common current limiting measure is analyzed, and
the sensitivity relation between current limiting measure and
node self-impedance is proposed. The conditions when the algorithm is used in multi-objective optimization of current limiting scheme are discussed. Then, case studies performed on
IEEE 39-node network indicate the effectiveness of the proposed model and method in simulation results.
An Evaluation Method of Maximum Urban Power Supply Capability Based on Dynamic Voltage
Stability Margin
pp. 1400-1404
TuB04.33
New Oscillation Emergence in Three-group Oscillation Mode and Its Control Measure Research
After Islanding
pp. 1410-1415
Xin
China Electric Power Research Inst.
Huiling LI
China Electric Power Research Inst.
Hongmei Luo
China Electric Power Research Inst.
Xin Zhang
Huazhong Univ. of Science and Technology.
Xiuyue Yu
State Grid Fujian Electric Power Company.
Feng Chen
State Grid Fujian Electric Power Company.
Shu Liu
Shandong Univ.
Shandong Univ.
Affected by the bad operating conditions, the transmission line
faults often occur. Thus timely fault cause identification is
needed to make reasonable plan for power restoration so that
to reduce the outage time. From the analysis of the fault
mechanism, we know the most essential difference between all
kinds of faults, is the distinction of transition resistances in the
grounding channel. The transition resistances of each fault
have two properties: resistance magnitude and volt-ampere
characteristics, which can be reflected by the average value
and standard deviation of the calculated transition resistance
instantaneous value respectively. Therefore, a algorithm by
combining the two characteristics of transition resistances for
fault cause identification has been proposed in this paper. Use
the electrical information during fault period to calculate the
transition resistances instantaneous value. In order to obtain a
high accuracy, this paper use Richardson extrapolation to
slove the discrete numericaldifferential problem involved in
the calculation. According to the comparison analysis of several typical actual faults, the paper set a criterion to identify the
cause of transmission line faults. Eventually, a number of actual sample tests show that the proposed algorithm works well.
TuB04.31
Zhang
pp. 1405-1409
Beijing Sifang Automation CO., LTD.
A method based on the dynamic voltage stability margin
(DVSM) is proposed for calculating the maximum urban power supply capacity (MUPSC). In this method, the objective is to
maximize the power load while observing N-1 security constraint. The constraints are system stability limit, thermal stability limit, excitation current limit of generators, voltage limit
of load, etc. Considering dynamic response of the electric power devices, this method overcomes the limitations of traditional
methods which is based on static power flow calculation and
load model and dynamic response are ignored. A real urban
grid is simulated, the result shows that by this method,
MUPSC is calculated effectively, limiting factors of MUPSC is
located as well as the weak points of the power grid.
Jian Ding
China Electric Power Research Inst.
Lihua Wu
China Electric Power Research Inst.
Yunting Song
China Electric Power Research Inst.
Dong Li
North China Electric Power Univ.
Zongchuan Zhou
State Grid Ningxia Electric Power
Economic Research Inst.
Dajiang Ren
State Grid Ningxia Electric Power
Economic Research Inst.
Mengmeng Jia
State Grid Jiangsu Electric Power
Research Inst.
Meng Wang
Materials Company of Henan
Electric Power Company.
Jiantao Gao State Grid Lianyungang Power Supply Company.
Based on an equivalent system model, new oscillation emergence phenomena of three-group oscillation mode are focused
after the traditional separation measure in which new oscillation center distribution character and regularity, its impact on
separation measure are studied. The simulation results of
Northeast Grid, Northwest Grid, East China and North China
Grid of China validated the presented new oscillation center
TuB04.32
Fault Cause Identification Based on Characteristics of Transition Resistances for Transmission
69
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
distribution character and regularity. The impact of all kinds
of three-group oscillation modes on isolation measure and corresponding counter-measure are discussed in which the traditional oscillation mode of three main out-of-step generator
groups, the mode of two main out-of-step generator groups
with one minor counter-part and the mode of one main
out-of-step generator group with two minor counter-parts are
included. Simulation result shows that the major out-of-step
interface should be the priority of the three-group oscillation
mode islanding strategy.
Analysis Based on Phase-plane Trajectory Geometrical Characteristic
pp. 1422-1426
Fu
Su
The Influence of Wind Farm Containing DFIG on
Power System Stability
pp. 1416-1421
Electric Power Research Inst. of Guizhou
Power Grid Co., Ltd.
Zuyi Ren
Meimei Xu
Baohui Zhang
Xi’an Jiaotong Univ.
Songhao Yang
Xi’an Jiaotong Univ.
Huaiyuan Wang
Xi’an Jiaotong Univ.
Time-domain simulation (TDS) for power system transient
stability is less efficient and tedious, and there is no uniform
standard to determine the transient stability based on empirically observation of the disturbed trajectories, which make the
efficiency and reliability cannot be satisfied at the same time. A
novel termination algorithm of time-domain simulation for
transient stability analysis based on phase-plane trajectory
geometrical characteristic is proposed in this paper. The output of time-domain simulation is used to analysis the transient
stability, and once the system is judged to be stable or unstable,
the time-domain simulation program is terminated. First, the
transient instability can be detected quickly based on the convexity and concavity of phase trajectory; and if the phase trajectory is convergent and the oscillation is damped, the system
can be detected to be stable early. The proposed method is easy
to achieve, the efficiency and validity is verified by simulations
on IEEE 39-bus 10-unit system.
TuB04.34
Chenghui Lin
Xi’an Jiaotong Univ.
NR Electric Co., Ltd.
Electric Power Research Inst. of Guizhou Power
Grid Co., Ltd.
Liang Wang
Yong Xiao
NR Electric Co., Ltd.
TuB04.36
Electric Power Research Inst. of Guizhou
Power Grid Co., Ltd.
Mingcai Kang
Zhiqian Bo
Study of Considering the Interruptible Load to
Improve the Limit Tranimission Power of Section Under the Constraints of N-1 Static Security
pp. 1427-1430
Nanjing Univ. of Science and Technology.
XUJI Group of SGCC.
Access of wind farm will not only change the distribution of
power flow but also have an impact on the power grid security
and stability. With the proportion increase of wind farm capacity in power system, it is necessary to study power system
stability containing a large number of doubly fed induction
generator (DFIG). In this paper, the mathematical model of
wind turbine generator based on DFIG was established. Analysis and simulation of actual system containing DFIG had been
completed, from the two aspects of reactive power change after
wind farm acessed and the influence of wind speed on wind
farm. At the same time, it has been analyzed that the influence
of wind farm containing DFIG on power system stability when
external AC power grid fault happened. Simulation results
show that the wind power generator based on the double fed
induction machine can make positive contribution for power
system to return to the normal operation when fault happens.
Zixia Pei
North China Electric Power Univ.
Lanlan Chen
North China Electric Power Univ.
Anjia Mao
North China Electric Power Univ.
Yan Liu
Economy & Technology Research Inst.of SGCC Liaoning.
Zhuohang Wu
Economy & Technology Research Inst.of SGCC
Liaoning.
Yuzheng Hou Economy & Technology Research Inst.of SGCC
Liaoning.
Introduce the viewpoint of interruptible load into N-1 static
security analysis of transmission capacity of transmission section;broaden the conditions of traditional N-1 analysis through
using the interrupt load management in receiving areas.A detailed mathematical model of the power flow constraints of
transmission section considering the interruptible load is established and the solving methods based on sensitivity analysis
is also given,and the relationship between the increments of
limit tranimission power of section and the interruptible load
quantities is obtained on this basis. The IEEE39 nodes numerical example in BPA running environment shows that the application of interruptible load to improve limit tranimission
power of section can improve the operation economy while
guaranteeing the security of the power system.
TuB04.35
A Novel Termination Algorithm ofTime-domain
Simulation for Power System Transient Stability
November 26-29，2015 Changsha，China
70
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
narios and requirements for self-healing control system of
smart distribution network were analyzed. Then, the static and
dynamic models of the control system were built based on
UML. Three types of self-healing control are realized through
four self-healing stages in three scenarios. Finally, based on the
modeling results, the system architecture and key applications
for the self-healing control system were implemented. The results in this paper are useful for investigation on the conceptions and key technologies, increasing the normalization and
reusability of self-healing control system as well as guidance
for real self-healing applications.
TuB04.37
Research on Automatic Testing Method of Antimaloperation Blocking in Smart Substation Bay
Level
pp. 1431-1434
Jian Qin
State Grid Jiangsu Electric Power Company.
Zhanyang Wang
State Grid Jiangsu Electric Power Company.
Xiaoyu Liu
Hua zhong Univ. of Science and Tech.
Xianggen Yin
Hua zhong Univ. of Science and Tech.
Hui Shi
TuB04.39
A Quantitative Assessment Method for Degree
of Transient Stability Coupling of DC and AC
Transmission Sections
pp. 1440-1445
State Grid Jiangsu Yangzhou Electric Power Company.
Jingchao Yang
Wuhan Kemov Electric Company Ltd.
Substation anti-maloperation blocking system plays a key role
in safe operation of power grids. Anti-maloperation blocking
test is necessary before commissioning of the substation to
ensure the correct blocking when mal-operated. The development of the smart substation puts forward higher requirements and provides more advanced technology. The common
test methods are complex and inefficient, and possible of
missed operation. On the basis of analysis of smart substation
anti-maloperation blocking test principle, this paper researches on automatically testing method based on IEC61850 in substation bay level. In addition, an automatic test system with
built in logic rules has been designed to complete the test efficiently, accurately and comprehensively.
Hongli Zhang
Xiaodan Cui
Haijun Chang
Zhou Xia
Li Wei
Huo Chao
Niu Shuanbao
Ke Xianbo
NARI Technology Development Co.,Ltd.
NARI Technology Development Co.,Ltd.
NARI Technology Development Co.,Ltd.
NARI Technology Development Co.,Ltd.
NARI Technology Development Co.,Ltd.
Northwest China Power System Dispatching &
Control.
Northwest China Power System Dispatching &
Control.
Northwest China Power System Dispatching &
Control.
Along with increasing operation of DC, the coupling degree
between DC and AC power systems is more tightly and the
influence with each other is more closely. It has great significance on improving the level of coordinated optimization control of power system security and stability and online auxiliary
decision-making for evaluating the degree of transient stability
coupling between DC and AC transmission sections quantitatively, and then searching automatically and identify the more
closely related AC transmission sections with the transient
stability coupling between DC and AC transmission sections.
The transient stability coupling mechanism between DC and
AC transmission sections is revealed by the theory of Extended
Equal Area Criterion. On this basis, the matrix of transient
stability margin of the dominant generators image of AC
transmission sections is established through different DC power disturbances, and then the curves can be fitted with least
square method. The curve slopes reflect quantitatively the
transient stability coupling between DC and AC transmission
sections. Finally the example demonstrated the effectiveness of
the method.
TuB04.38
The modeling of self-healing control system for
distribution network based on UML
pp. 1435-1439
Wei Liu
The Production and Technology Department
Guangdong Power Grid Corporation.
Taifeng Kang
Business Department of Distribution Network
Beijing Sifang Automation CO., LTD.
Wenxin Cheng
Business Department of Distribution Network
Beijing Sifang Automation CO., LTD.
Fengqing Zhao
Business Department of Distribution Network Beijing Sifang Automation CO., LTD.
Self-healing for smart distribution network which is based on
Distribution Automation(DA) and Advanced Distribution Automation（ADA）, is one of the key characters and core functions for smart distribution network to deal with the inside and
outside threatens of the network as well as to increase system
operation security and efficiency. In this paper, we focus on the
modeling of self-healing control system for distribution network based on UML. Firstly, the background, application sce-
71
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
and fuel cost included in the objective function. Thus the ra-
TuB04.40
tional spinning reserve is optimized to prevent wind power
ramp events. Monte Carlo method is adopted to simulate the
Study on Electromechanical Dynamic of Power
Systems Based on Trajectory Eigenvalue Sensitivity
pp. 1446-1451
wind power ramp in each time interval. Conventional units’
Teng Wang
Delin Wang
Ningning Ma
You Yuan
of the proposed method.
output and spinning reserve at 15-min time-scale are optimized
based on the determined unit commitment. The analysis of the
numerical examples are carried out to verify the effectiveness
Southwest Jiaotong Univ.
Southwest Jiaotong Univ.
Southwest Jiaotong Univ.
Southwest Jiaotong Univ.
Traditional small disturbance analysis method and eigenvalue
sensitivity (ES) are unable to accurately analyze the electromechanical dynamic characteristics of power systems. Based
on trajectory eigenvalue method, the power system models are
TuB04.42
linearized at non-equilibrium points (NEPs) and the trajecto-ry eigenvalues are calculated. With the changes of trajectory
Study on the Calculation Model of Maximum
Allowable Time and Ampacity for Overload Operation of Overhead Transmission Line in a Short
Time
pp. 1458-1461
eigenvalues, the factors affecting oscillating amplitude and
oscil-lating period are studied. Combined trajectory sensitivity
(TS) with ES at equilibrium points (EPs), the trajectory eigenvalue sensitivity (TES) is proposed and calculated by numerical per-turbation method. Based on the WECC 3-machine
9-bus system, the influence of disturbance size, disturbance
duration, the gen-erator’s inertial and damping upon trajec-
Ziqing Xia
tory eigenvalues are analyzed. The TES to system parameters
Yunfeng Xia
are calculated and the trajectory eigenvalues of different pa-
Central Soutlth Univ.
Dongguan Power Supply Bureau of Guangdong
Power Grid Corporation.
rameters are analyzed on different time sections. Finally, the
advantages for TES than ES at EPs are verified in terms of
Zheng Xu
Chongqing Univ.
research electromechanical dy-namic characteristics.
Jiamin Wu
Chongqing Univ.
At variance with the development of society economy, electricity transmission capacity is utilized insufficiently. It is of importance to research on the operation capability for transmis-
TuB04.41
sion line under the condition of overload in a short time. Based
Spinning Reserve Model in Response to Wind
Power Ramp Events at Sub-Hourly Time-scale
pp. 1452-1457
ble time of overload operation in different temperatures can be
on the dynamic heat balance equations, the maximum allowaobtained. Take the typical meteorological condition of Guangdong district for example, the maximum permissible temperature, maximum allowable time of overload operation, and increment of current carrying capacity for different types of
Xinyuan Tong
Shan Dong Univ.
Hongtao Wang
Shan Dong Univ.
aluminum conductor steel reinforced (ACSR) are analyzed.
Wind power ramp events, driven by extreme weather conditions, will bring huge operational risk to the system. Considering the difficulty for hourly dispatch to respond to wind power
ramp events within 1h, sub-hourly dispatch are scheduled in
this paper. Loss of load expectation and expectation of wind
TuB04.43
power curtailment caused by wind power ramp are set to satisfy the limit value. The expense of load loss and wind power
Research on the Security Risk Assessment Sys-
curtailment is converted into the risk cost, with reserve cost
November 26-29，2015 Changsha，China
72
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
equipment maintenance model and system condition-based
maintenance model is proposed. The modified imperfect
maintenance model-Kijima II model is selected for equipment
maintenance model comparing with minimal repair and perfect maintenance through optimizing imperfect maintenance
effect factor. In addition, a genetic algorithm is used to find the
optimal maintenance strategies from possible maintenance
scenarios. These optimal maintenance strategies have been
tested on a HVDC link which is simplified into an equivalent
serial and parallel system and an IEEE-RTS79 system. The
results demonstrate the feasibility and validity of the proposed
model.
tem for Regional Complex Power Grid
pp. 1462-1465
Faqi Yan
Central China Electric Power Dispatching
and Control Sub-center of State Grid
Yang Wang
Central China Electric Power Dispatching
and Control Sub-center of State Grid
Xianggen Yin Huazhong University of Science and Technology
Jinhui Li
Huazhong University of Science and Technology
Wen Yang
Huazhong University of Science and Technology
Biao Xu
Huazhong University of Science and Technology
Cheng Jian
Huazhong University of Science and Technology
TuB05.2
In order to guarantee the safe and stable operation of the complex power grid and prevent wide-area blackouts, safety and
risk assessment of power grid, which is carried out by charge
of the third party independent evaluation agency, is an important means of safety risk management and conducive to
satisfy the respective requirements and interests of government,
power enterprise and power user. Besides, it will promote the
progress of deregulation of power grid under the present electric power system. Considering the current situation of regional power grids of China and the requirement of power grid
security risk control, this paper introduces the framework and
methods of safety and risk assessment for large power grid and
analyzes one case of the application in a trans-provincial regional power grid of China.
The Comprehensive Assessment of Composite
Insulator Aging Condition
pp. 1472-1477
Miaofu Ning
Southern Power Grid uhv Transmission
Company.
Qisheng Liu
Wuhan Univ.
Xueping Yu
Hunan power grid provincial maintenance company.
Yan Chen
Jian Wang
Wuhan Univ.
Chang Jiang inst. of survey, design and research.
TuB05.1
Silicone rubber composite insulator with its excellent performance is being in a wide range of applications in our country
instead of the traditional insulator. Most of the statistical results show that the composite insulator aging is the main reason of the failure. Composite insulator becomes one of the
weakest link, constitutes a great threat to the safe operation of
high voltage transmission line. So to carry out the research on
the aging of composite insulators, build a complete aging evaluation model, timely grasp the insulator aging status is of important significance to the safe and stable operation of power
system.
In this paper, the variable weight theory is combined with the
fuzzy analytic hierarchy process, and a multi-level and multiindex aging assessment model of composite insulators is constructed. The main work of the aging assessment includes: the
determination of the weight of the index, the construction of
the aging assessment model, and the verification of the model.
First of all, we construct two layers of evaluation index system-the project layer and the index layer. Second obtain the
constant weights, and introduce the variable weight model
based on equilibrium function to obtain the variable weight.
Then we chose the fuzzy analytic hierarchy process to build the
insulator aging state comprehensive evaluation model. In the
end, the aging model is verified by the experimental data of the
composite insulators of the transmission line. The results show
that the fuzzy comprehensive evaluation model based on the
variable weight theory can objectively reflect the aging state of
A Condition-based Maintenance Approach to an
Optimal Maintenance Strategy Considering
Equipment Imperfect Maintenance Model
pp. 1466-1471
Yeyong Li
Shandong Univ.
Xueshan Han
Shandong Univ.
Bo Xu
Shandong Univ.
Yunpeng Wang
Shandong Univ.
Power grid tries to maximize its profit by reducing generation
cost, supply costs and operation costs while sustaining its required reliability. Developing maintenance strategies is one of
the most effective methods. The condition-based maintenance
approach is a key method in providing optimal maintenance
strategies in theory. It considers the tradeoffs between the system maintenance risk and the potential system failure risk of
system reliability losses. Since power grid contains a group of
different kinds of equipments and the reliability of the electric
equipments varies with time. One type of electrical equipment
has different maintenance models because of their different
failure modes and deterioration processes. A union method for
73
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
insulators objectively. The model has a reference for the
maintenance and replacement of insulators.
the type and the location of the accelerator is taken into consideration, the signal processing circuit is designed, the data
acquisition (DAQ) card is chosen, at the same time, the software is developed by VC++, LabVIEW and MATLAB, which
can acquire data and denoise the signal with user friendly interface.
TuB05.3
Simulation of Electric Field Around Insulators in
High Voltage Line
pp. 1478-1482
TuB05.5
Application of Accelerometers in V ibration Test
of High Voltage Circuit Breaker
pp. 1488-1491
Zhangang Yang State Grid Chongqing Electric Power Company.
Hongbing Li
State Grid Chongqing Electric Power Company.
Huaxing Yu
State Grid Chongqing Electric Power Company.
Yu Liang
State Grid Chongqing Electric Power Company.
Jixiang Wu
State Grid Chongqing Electric Power Company.
Jiamin Wu
Chongqing Univ.
Xianjun Cui
Chongqing Univ.
Bin Wu
State Grid Chongqing Electric Power Company.
Jing Zhang
State Grid Chongqing Electric Power Company.
Yan Liu
Li-an Chen
MEMS (Micro-Electro-Mechanical System) piezoresistive accelerometer is proposed for the vibration measurement in the
vicinity of vibration source inside high-voltage circuit breaker
for mechanical fault diagnosis, which is verified from the theory as well as comparative test with piezoelectric accelerometer.
The high voltage circuit breaker vibration test scheme based
on MEMS piezoresistive acceleration sensor is presented in the
paper.
Insulators are important parts in power system, the property
of insulator is good or bad will directly influence the operation
of power system. Under the action of natural environment and
electric field with high strength, electrical property and mechanical property of the insulators will decrease, as the service
year of the insulator increasing. So how to find the insulator
with defect and replace it with a good insulator is important to
ensure security operation of the power system. In this paper,
electrical porcelain insulators used in 110kV power transmission line were analyzed, electric field around insulators with
different states through Maxwell software. The results show
that: Through the regularities of electric field distributed
around the insulators, we can estimate the properties of them.
TuB05.6
Research on Condition Assessment for Distribution Vacuum Switch Cabinets Based on Multi-source Information Fusion
pp. 1492-1497
Chaoqun Kang
Jianhua Zhang
Wanxing Sheng
Erxia Li
Fangyuan Chang
Design and Development of Condition Monitoring System for Circuit Breaker Based on Vibration Signal
pp. 1483-1487
North China Electric Power Univ.
Middle voltage circuit breakers (MVCB) are important in
power system. Applying condition monitoring on a MVCB is
beneficial to detect potential hazards. Vibration analysis is a
noninvasive method for condition monitoring of mechanism.
Furthermore the vibration signal on framework of a MVCB
carries abundant information of its operating mechanism.
Thus developing a condition monitoring system for a MVCB is
necessary and meaningful. During the building of the system,
November 26-29，2015 Changsha，China
North China electric power univ.
North China electric power univ.
China electric power research inst.
China electric power research inst.
China electric power research inst.
Serve as one of the most important equipments in power distribution system, conditions of switch cabinets are closely connected with safety and stability of distribution network and
exert great influence on power quality used by customers. But
the information applied in the current research of distribution
switch cabinet is not comprehensive enough, and the assessment model is not dynamic enough, because of this, a distribution vacuum switch cabinet dynamic condition assessment
model based on multi-source information fusion is proposed in
this paper. The vacuum switch cabinet is divided into three
parts—vacuum circuit breaker, buses and cable outlets. The
information used to assess these three parts’ conditions concludes ultrasonic results, TEV results, infrared temperature
measurement results, vacuum degree, insulation resistance and
mechanic parameters. Moreover, environment information,
operation information and position information of the switch
cabinet are also taken into consideration. Membership functions and scale models are used in the condition assessment.
Thus, the historical conditions of the switch cabinet in the past
5 years can be obtained, and Bayes conditional probability
model is used to fuse these condition assessment results. In the
TuB05.4
Zhirui Liang
Xiamen Univ. of Technology
Xiamen Univ. of Technology
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
meantime, the corresponding examples are given to prove the
validity of the models proposed in this paper.
TuB05.9
Based on WAMS Generator Primary Frequency
Regulation Calculation Methods and Its Comprehensive Evaluation Methods
pp. 1511-1516
TuB05.7
Risk Assessment for Distribution Transformer
Burning-out Based on D-S Evidence Theory
pp. 1498-1503
Yu Zhang
Fei Gao
Jianfang Li
Xueping Feng
Xiaohui Song
Caixiu Li
Li Dai
Dahai You
Xianggen Yin
Kai Wang
Yan Yang
Zhe He
Cheng Long
Gang Wang
Meilin Dong
Jin Hu
China Electric Power Research Inst.
China Electric Power Research Inst.
China Electric Power Research Inst.
China Electric Power Research Inst.
China Electric Power Research Inst.
Jiamusi Suburb Electric Power Company
Distribution transformer is one of the most important components of distribution power system, and its normal operation
plays a very important role in power system. It is significant
for operator to assess the risk of distribution transformer
burn-out by fusing kinds of information of different automation systems in power system. The risk factors and their
weights of distribution transformer burn-out are analyzed in
the paper. A risk assessment method for distribution transformer burn-out based on the Dempster-Shafer evidence theory and expert experience knowledge is prevented in this paper,
which regards the severity of distribution transformer
burn-out caused by different risk factors scored by expert as
evidence of distribution transformer burn-out. All the evidence
is combined according to the Dempster’s combination rule,
inferring the probability of distribution transformer burn-out.
The example of distribution transformer burn-out risk testifies
the feasibility and effectiveness of proposed approach, which
can accurately identify the transformer burn-out risk.
This article use adjustment dead zone, difference coefficient,
lag time, stable time and contribution rate to construct the
primary frequency index system and use WAMS data to analyze the generator primary frequency index calculation methods. At last, this paper uses the analytical hierarchy process
(AHP) and entropy weight comprehensive evaluation methods
to evaluate the generator primary frequency performance. The
effectiveness and correctness of proposed indices calculation
methods and comprehensive evaluation methods are validated
by the province actual WAMS data.
TuB05.10
Design of Integrated Supervisory Control System
for 110 kV Dry-type Transformer
pp. 1517-1521
TuB05.8
Guangming Zhang
Consensus Clustering Algorithms for Asset
Management in Power Systems
pp. 1504-1510
Qiang Gao
Long Yan
Yanli Xin
Wenhu Tang
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Maojun Wang
Qi Liu
Univ. of Liverpool
South China Univ. of Tech.
South China Univ. of Tech.
Dantian Zhong
Hongkai Li
This paper aims to present an intelligent approach to the Asset
Management (AM) in power systems. Three existing consensus
functions (i.e., Non-negative matrix Factorisation based,
Weighted Partition via Kernel and Information Theorybased)
have been compared and applied to analyse a power system
document depository (PSD). In addition, ontology is employed
in this research to implement a document dataset modification,
which shows a significant improvement for the single consensus clustering algorithm. Moreover, Genetic Algorithm (GA) is
utilised to solve the weighted kernel-based consensus function.
The influences of different settings of GA are analysed. Relevant improvements of GA are also presented.
Rongyu Du
State Grid Liaoning Electric Power Research Inst.
State Grid Liaoning Electric Power Research Inst.
State Grid Liaoning Electric Power Research Inst.
State Grid Liaoning Electric Power Research Inst.
State Grid Liaoning Electric Power Research Inst.
State Grid Chaoyang Electric Power
Supply Company
State Grid Chaoyang Electric Power
Supply Company
The paper proposes a design scheme of integrated supervisory
control system which is suitable for both 110kV drytype transformer and intelligent substation. Some special problems such
as how to measure temperature in the high voltage winding is
discussed in the paper. Fiber grating sensor is used in the system because of its strong anti-interference ability and accuracy
for temperature. The installation method, quantity and trace of
fiber are also discussed. The grounded current of core and
working current could be monitored through the high precision current transformer. The supervisory and control intelligent electronic device (IED) is used the modular design method
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
based on high-performance ARM processor in order to improve the hardware and software efficiency. It receives the
value of winding and core temperature, ambient temperature,
grounded current, and analyzes the status of transformer. According to the data the IED could control the cooling fan to
reduce the temperature. The IED also can deliver the data to
substation control layer using IEC 61850. The comprehensive
application server could display the panoramic data such as
monitoring and warning data of transformer.
high-voltage electric power equipment. Thus, it is an urgent
issue to monitoring these gases. However, existing inspection
methods still fail to conduct on-line monitoring of SF6 decomposed gases. Aimed to solve this problem, this paper proposes
an On-line SF6 decomposed gases monitoring approach based
on the Quantum-Cascade Laser Absorption Spectroscopy. In
this system, the composition and the concentration of each
kind of gas can be obtained by testing the absorption peak
value and absorption intensity of the wavelength. Experiment
results show that the proposed system is able to perform
on-line monitoring of SF6 decomposed gases with high accuracy.
TuB05.11
An Equipment Energy Efficiency Evaluation
Method for Industrial and Commercial Use
pp. 1522-1526
Ciwei Gao
Haiming Luo
Lulu Zhu
Fuchao Liu
Yongjun Han
TuA05.13
Prediction of Dissolved Gas in Power Transformer O il Based on Random Forests Algorithm
pp. 1531-1534
Southeast Univ. Chengxian Coll.
State Grid Huaian Power Supply Company
Jiangsu Electric Power Maintenance Branch
Company Huaian Division
Electrical Power Research Inst. of State Grid
Gansu Power Company
Electrical Power Research Inst. of State Grid
Gansu Power Company
Ke Deng
Weihong Xiong
Liming Zhu
Hongzhi Zhang
Zhengtian Li
State Grid Hubei Electric Power Company Overhaul Branch
Center China Grid Company Limited
HUST
HUST
HUST
With electrical energy conservation and emissions reduction
promotes in China, the research on electrical energy efficiency
evaluation has become one of the hot topics in the studies on
power system. Meanwhile, with customers’ requirement on
accurate assessment increases, it’s a trend to change from energy measurement to efficiency measurement of equipment in
industrial and commercial scenes. An equipment energy efficiency on-line monitoring method was introduced for industrial and commercial use and an equipment energy efficiency
evaluation model with probability was described in detail. The
simulation on three-phase asynchronous motor with MATLAB
indicated the feasibility of the evaluating model and method,
which could effectively promote the appliance of energy efficiency on-line monitoring and reduce economic investment for
monitoring.
In order to adopt reasonable measures to anticipate and avoid
possible internal failures in power transformers, accurate prediction of power transformer oil dissolved gas trends is useful.
It is necessary to realize the condition based
maintenance of power transformers, and the prediction of dissolved gas in the oil is solid foundation. The gas concentration
is affected by many factors, so prediction model built by reasonable selection of the larger correlation factors will help to
improve prediction accuracy. Random forests algorithm is
used to predict the gas trends and the prediction performance
evaluation is realized by appropriate evaluation indexes. By
comparison with support vector machine prediction, the advantage of random forests method for power transformer oil
dissolved gas prediction is proved.
TuB05.12
TuB05.14
A Novel On-line SF6 Decomposed Gases Monitoring Approach Based on Quantum-Cascade
Laser Absorption Spectroscopy
pp. 1527-1530
Research on the Modification Methods for the
Failure Rate Curve of Electric Equipment
pp. 1535-1540
Yongquan Mao
Ziguan Zhou
Yanbin Song
Yong Wang
Guoyan Chen
Jie Ji
Zhe Zhang
Xu Chen
Xianggen Yin
State Grid Info. &Telecommunication Group
CO.,LTD
State Grid Info. &Telecommunication Group
CO.,LTD
State Grid Info. &Telecommunication Group
CO.,LTD
Aiming at the shortcoming of the difficulty to fully reflect the
effects of individual differences, maintenance and health state
on the equipment failure rate curve based on statistical analysis, the modification methods taking the factors of long-term
development and short-time variations into account are put
forward in this paper. The least square method is used to esti-
In the field of high-voltage electric equipments, the SF6 gas as
insulation material is widely used in various kinds of Gas Insulated Switchgears (GIS). And the decomposition of SF6 gas
under discharge would generates various kinds of gases, which
may seriously result in worse insulation performance of the
November 26-29，2015 Changsha，China
Guangzhou electricity Supply Company
Guangzhou electricity Supply Company
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
Huazhong Univ. of Science and Tech.
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
mate the parameters of Weibull distribution function and the
Marquardt method is combined to deduce the demarcation
point and distribution curve of the failure rate. On this basis,
the equipment failure rate curve is modified to accord better
with the actual operation situation from three aspects of individual defect, maintenance situation and healthy state evaluation respectively. By the example analyzing, the validity of the
research is illustrated.
TuB05.17
Analysis Correlation Modeling of the O il Flow of
Transformer and Temperature
pp. 1549-1553
Dongri Yan
Changsha univ. of science and tech.
Rui Ma
Changsha univ. of science and tech.
Haijing Yang State Grid HAEPC Electric Power Research Inst.
Yongchao Liang
Human Electric Examine and Repair
Company
TuB05.15
Research on Operation Condition Monitoring
and Security early Warning System of Distribution Substation
pp. 1541-1544
Xinyuan Liu
Shuyong Song
Dongping Li
Zhang Cheng
Transformer oil is the main insulation and heat dissipation
medium of oil immersed transformer, its flow velocity, pressure
and density distribution has a significant effect on transformer
insulation and heat dissipation performance. Based on this,
this paper has deduced the relationship between the oil flow
velocity and the instantaneous temperature field of the transformer, and the mathematical model. The simulation results
reveal the relationship between the fault of the transformer
and the flow velocity of the oil, and provide the theoretical
basis and simulation platform for the study of the digital gas
protection based on the fault characteristics. In addition, analyze the relationship between the temperature of inlet oil flow
and the load factor and the temperature rise in the transformer,
providing a good base for studying the setting value of the
transformer gas relay.
State Grid Shanxi Electric Power Research Inst.
State Grid Shanxi Electric Power Research Inst.
Department of Art and Design Communication University of Shanxi
Qingpu Electric Power Supply Company
of Shanghai
The key state information index and sensing scheme of distribution substation are established, and a software and hardware scheme is designed and developed for the monitoring and
safety warning system of power distribution substation. This
new system can greatly improve the intelligent and automatic
level of distribution substation, which has the advantages of
simple operation, powerful function and low cost, which has
great practical value.
TuB06.1
Adaptive Communication Resource Allocation
for W ide Area Measurement System
pp. 1554-1558
TuB05.16
Design of New MOA Arrester Tester
pp. 1545-1548
Qiao Wang
Lixing Zhou
Weixian Chen
Lijian Xu
Junhui Zhao
Zhong Chen
Changsha Univ. of Science and Tech.
Changsha Univ. of Science and Tech.
Zhuzhou State Grid Power Company
Farmingdale State Coll.
Univ. of New Haven
Changsha Univ. of Science and Tech.
Phasor measurement units (PMUs) in a wide area measurement system (WAMS) environment offer precise estimates,
improved post-disturbance analysis, and efficient advanced
control. When communication resources are limited, WAMS
data transmission network design must consider accuracy as a
critical limitation. Focusing on the optimal resource allocation,
this paper studies the system accuracy and its relation to
transmission protocol design. An adaptive communication time
division based assignment is investigated. Algorithms are developed and they are shown to achieve the optimal resource
usage. Illustrative examples demonstrate significant advantages of our accuracy-based time division allocation methodologies over traditional TDMA strategy.
Now the most used detecting method of MOA is the full current and resistive current on-line test. And the test method of
existing instrument needs to get voltage signal from the second
terminal of voltage transformer. This method is dangerous
because an improper operation will cause a short-circuit in
voltage transformer and even endanger personal safety.
Therefore, in order to solve the above problems, a new MOA
arrester tester is developed in this paper. It uses a new way to
obtain voltage phase signal and it gets voltage signal from the
high voltage side of primary equipment and then sends it to the
tester developed in this paper through wireless transmission to
convert it to low voltage signal and then outputs to the original
arrester tester to complete the resistance current testing. The
device developed can finish arrester electrified test safely, accurately and conveniently. It can overcome the limitation of
getting voltage signal from the second terminal of voltage
transformer and the effect of interphase interference on test
results can be effectively solved.
TuB06.2
Chinese Energy Supply and Demand Structure
77
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
into the network is one of the development priorities of the
integrated energy system. For the control method of the energy
storage system, the most important part is the dispatchment
control strategy of the energy storage system. It is expected
that the energy system can discharge more energy during the
peak load period and discharge less during the valley load period. Directing at this aim, this paper uses fixed threshold and
dynamic threshold method to calculate the discharge threshold
power to control the discharge power of the storage system
respectively. Comparing the energy management results, the
dynamic threshold method is confirmed to have higher energy
management efficiency.
Model and Power Grid Benefit Analysis
pp. 1559-1564
Xiaoxia Wei
Jie Liu
Tiezhong Wei
Lirong Wang
State Grid Energy Research Inst.
Heilongjiang State Grid Company
Heilongjiang State Grid Company
Heilongjiang State Grid Company
With the energy source amount of exploitation and usage, the
accelerating of energy consumption gross, source and environment can affect the energy system restrict affection are
stronger. The energy source amount per person is lower. Primary energy storage and structure problem is standing out.
Energy usage can pollute seriously. Chinese energy supply and
demand problem is research key point. This paper researches
Chinese energy supply and demand pattern system and evaluation methodology, gives out the inner and outer influencing
elements. And evaluate Chinese energy supply and demand
pattern from energy gross, structure, distribution and transportation. Give the energy supply synthesize radar comparison
chart in certain time period. From the energy security, economy, clean and efficiency, analyze the benefit comparisons of
Chinese energy supply and demand pattern. This energy supply and demand pattern model will give one certain theoretical
analysis and practice reference.
TuB06.4
Power System Fault Simulation in SG-OSS DTS
pp. 1570-1574
Wenhui Wei
Jie Chen
Chengjie Zhao
Changnian Li
Rui Ge
Guodong Li
TuB06.3
With the increasing complexity of grid dispatching, it becomes
an inescapable trend to implement a full dynamic simulation of
DTS while fault simulation is a key component in dynamic
simulation. This paper describes the design and implementation of fault simulation in a new generation of DTS based on
multi-threaded multi-core processor architecture of parallel
computing algorithm. Firstly describes the core design calculations for the fault, then describes the characteristics and features of fault simulation in the DTS environment. A numerical
example was given to show the feasibility and practicability in
large-scale power grid.
Energy Management Method Applying in Integrated Energy System
pp. 1565-1569
Yiru Chen
Ke Jia
Bohan Liu
Guozeng Yan
Dongfang Wang
Chunlai Li
North China Electric Power Univ.
North China Electric Power Univ.
State Grid AC Project Construction Co., Ltd
State Grid AC Project Construction Co., Ltd
Qinghai Province Key Laboratory of Photovoltaic Grid Connected Power Generation
Technology State Grid Corporation of China
Qinghai Province Key Laboratory of Photovoltaic Grid Connected Power Generation
Technology State Grid Corporation of China
The development and utilization level of energy is an important symbol of the technology and living standards of the
society. Integrated Energy System (IES) is important to improve energy efficiency and promote the large-scale development of the Renewable Energy Source (RES). In the meanwhile, it also can improve the utilization of the social infrastructure and secure the energy supply. It has become a significant research topic in the international energy field. Photovoltaics, wind turbines and other renewable energy source of
electricity are coupled with energy storage system to supply
power to the local consumers in the IES, which can reduce the
energy transmission losses and the large disturbances impact
from the main grid. Since the inverse distribution of the output
power of some renewable energy distributed generation and
the load demand, the research of the energy storage system
control to achieve the target of high efficient local utilization of
the renewable energy and avoid a large excess power flowing
November 26-29，2015 Changsha，China
Beijing Kedong Electrical Power Control
System Co. Ltd
Beijing Kedong Electrical Power Control
System Co. Ltd
Beijing Kedong Electrical Power Control
System Co. Ltd
Beijing Kedong Electrical Power Control
System Co. Ltd
State Grid Dispatching Control Center
State Grid Dispatching Control Center
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
nology
TuC01.1
High Frequency Modeling Technique for
ThreePhase Power Electronics Module
pp. 1575-1579
A.Cataliotti
D.Di Cara
G.Marsala
A.Pecoraro
A.Ragusa
G.Tinèi
Univ. di Palermo
National Research Council, Palermo, Italy
National Research Council, Palermo, Italy
National Research Council, Palermo, Italy
National Research Council, Palermo, Italy
National Research Council, Palermo, Italy
Nowadays, the high integrated power electronicsmodules
(PMs), characterized by high speed, low loss and hardware
miniaturization, represent a new technology that meets the
emerging demands of many applications, such us vehicle and
home appliance, renewable energy sources in smart grid. The
integration process and the high switching speeds increase
thePM electromagneticemissions that can createelectro- magneticinterference(EMI) withelectric/electronic devices near the
PMs. For this reason, electromagnetic compatibility (EMC)
have to be carefully considered, yet in the design phase, to
guarantee the reliability of PM systems. In this paper a method
to develop a high frequency (HF) model, useful to study EMI
phenomena of a three-phase PM, is presented. The method is
based on experimentalmeasurements at the PM external pins
and it allows to extract internal inductive and capacitive parasitic coupling without the knowledge of structural and physics
parameters of the device. The PM HF model, developed in the
150kHz-30MHz frequency range, has been implemented in
MATLAB® environment. The method has been experimental
validated comparing the frequency responses of the PM characteristics with that obtained by the model.
TuC01.2
A Problem about TF/SF Technique in the FDTD
Simulations of Cylindrical Waves and Spherical
Waves
pp. 1580-1582
Jianyong Wang
Cuihong Liu
Hohai Univ.
Hohai Univ.
The finite difference time domain methods(FDTD methods)
are the most popular simulation methods of the electr- omagnetic waves, and the total field/scattered field technique(TF/SF
technique) is the main source technique of the FDTD methods.
The amplitude of the electric fields and the amplitude of the
magnetic fields are considered as invariant in the connection
interface between the total field regions and the scattered field
regions, when cylindrical waves and spherical waves are simulated by the FDTD methods and the TF/SF technique is applied.
But this consideration is wrong because that the amplitude of
cylindrical waves and the amplitude of spherical waves are
both not constants on the direction of propagation, and thus
C: High Voltage Transmission Tech79
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
the computational results are effected. A new method for applying TF/SF technique in the FDTD simulations of cylindrical
waves and spherical waves is brought forward. The method
considers the variations of the amplitude of cylindrical waves
and the amplitude of spherical waves on the direction of propagation, and thus the problem is solved. Numerical experiments were done, and the experiments indicate that the new
method can effectively improve the simulation results.
ture or thermal aging state on the voltage initial slope by
changing charging and discharging time. Then the examples
are analyzed when the moisture content in the transformer
increase, the initial slope of the decay voltage significantly increased; the initial slope of the recovery voltage also increases
obviously when the thermal aging degree of the transformer
increased. The results show that it really has some effect on the
initial slope of decay voltage when oil paper insulation damp,
so as the initial slope of the return voltage when oil-paper insulation thermal aging.
TuC01.3
TuC02.2
Parallel Computing of Electromagnetic Field
Based on Domain Decomposition Method
pp. 1583-1586
Tianwei Li
Tian Wu
Simulation of Propagation Characteristic of Ultra
High Frequency Signals in Power Transformers
Using Finite Difference Time Domain Method
pp. 1591-1594
Electric Power Research Inst.
China Electric Power Research Inst.
Bin Xu
Yanming Li
Junhong Zhao
Xinjun Wang
Ruixiang Zhang
The computing velocity and memory storage of Single PC are
often limited in large-scale electromagnetic simulation by finite
element method (FEM), parallel processing is an important
means to overcome such problems. The domaindecomposition
method (DDM) which decomposes the domain by nodes dominating and suits for parallel computing was illustrated first in
this paper; A 2D electrostatic model was built and decomposed
by the DDM; And the FEM linear system of equations was
solved by using parallel CG method on the distributed parallel
system composed of 6 PCs, the effective speed up reaching
97.5% was satisfying. Especially for large-scale simulation
which consists of more than millions of freedoms, the parallel
processing reduces computing time and increases the computing velocity greatly, it’s the base on which large-scale 3D electromagnetic parallel computing.
Xi’an Jiaotong Univ.
Xi’an Jiaotong Univ.
Xi’an Research Inst. of Hi-Tech.
Xi’an Research Inst. of Hi-Tech.
Xi’an Research Inst. of Hi-Tech.
In order to study the propagation characteristics of Ultra High
Frequency (UHF) signals excited by partial discharge in an
actual power transformer, a simulation model of the power
transformer is established using Finite Difference Time Domain (FDTD) method to simulate the propagation progress of
the UHF signals. The receiving signals in different points and
planes are analyzed by time domain and frequency domain
methods. The results show that due to the complicated structure, the magnitude of the receiving signals vary greatly with
places and the distribution of energy also varies very much.
The higher the frequency, the greater the attenuation.
TuC02.1
The Impact of Oil-paper Insulation Moisture and
Aging on the Initial Slope of the Voltage
pp. 1587-1590
Xiaorui Tan
Tao Zhang
Qian Zuo
Qi Zhang
TuC02.3
Experimental Research on minimum approach
distances and complex gaps for Live Working in
Substation
pp. 1595-1599
Three Gorges Univ.
Three Gorges Univ.
Three Gorges Univ.
Shiyan Power Supply Company
Hubei Electric Power Company
Bin Xiao
Kai Liu
Tian Wu
Ting Liu
Yong Peng
Xinglie Lei
Ziming Su
Pan Tang
The polarization spectrum method based on the recovery
voltage is a non-destructive method for insulation diagnosis
and lifetime evaluation. It has been used to evaluate the insulation condition of the transformer. The main time constant is
often used for diagnosis of oil paper insulation moisture state,
and the initial slope of the voltage is used to diagnose the
thermal aging state of oil-paper insulation by return voltage
measurement method, but the results are not accurate. Since
the initial slope is closely related to the polarization conductivity, based on the basic method of return voltage, the paper
analyze the effect of oil-paper insulation with different mois-
November 26-29，2015 Changsha，China
China Electric Power Research Inst .
China Electric Power Research Inst.
China Electric Power Research Inst.
China Electric Power Research Inst.
China Electric Power Research Inst.
China Electric Power Research Inst.
China Electric Power Research Inst.
China Electric Power Research Inst.
Live working in substation is of importance to ensure the reliability of power system. Minimum approach distance and
complex gaps are key parameters for safety of workers and
electric equipment in substation. The discharge characteristic
curves corresponding to four live working gap configuration in
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
substation ,such as "equalpotential personnel-grounding
structures", "equipotential personnel-adjacent phase bus",
"live phase bus-working personnel-grounding structures",
"live phase bus-working personnel-adjacent phase bus" were
obtained by the switching impulse discharge test in this article .
Combined with overvoltage level of 220 kV typical substation
design scheme ,the minimum live working electrical minimum
approach distances were calculated : phase to ground safe distance 1.2 m, phase to phase safe distance2.1 m ,and a safe distance, phase to ground complex gaps 1.3 m, phase to phase
complex gaps2.2 m . The minimum approach distances comply
with relevant regulations for 220 kV substation live working by
comparative analysis.
TuC02.5
The finite element simulation analysis and test
study of insulator ground icing flashover
pp. 1606-1611
Min
China Electric Power Research Inst.
Bin Xiao
China Electric Power Research Inst.
Yong Peng
China Electric Power Research Inst.
Xinglie Lei
China Electric Power Research Inst.
Ziming Su
China Electric Power Research Inst.
Pan Tang
China Electric Power Research Inst.
of
Te c h .
Dan Li
Hunan University of Tech.
Jinhui Zeng
Hunan University of Tech.
State Grid Hunan Electric Power Construction
The icing phenomena occurred in south China has seriously
affected the safe and stable operation of the power grid. Some
research results in this field has been reported in China and
some other countries. However, there are rare results related to
the parallel flash gap insulator ground icing network. This
paper used the finite element analysis software to simulate the
parallel gap distance icing flashover voltage, conducted icing
tests to the RCSE 100C-2 insulator in artificial climate laboratory, and quantitative analyzed the impact of the parallel gap
distance icing flashover voltage. The results show that flashover voltage shunt size and the gap size were intimately related
after the icing bridge is formed up between the ground insulators. The flashover voltage was higher when the gap in parallel
was larger, and the dry flashover voltage is higher than the wet
flashover voltage in the same gap conditions.
T ian Wu China Electric Power Research Inst .
Ting Liu
University
Supervision
Insulation Property of Wire-plane Gap under
Fire Condition: Effects of Vegetation Flame
Conductivity
pp. 1600-1605
China Electric Power Research Inst.
Hunan
Wanli Yang
TuC02.4
Kai Liu
Lei
TuC02.6
Diagnosis and Analysis for A Typical Defect of
Partial Discharge in GIS
pp. 1612-1616
Energy distribution and economic development level of our
country are imbalance, and a large number of EHV and UHV
transmission lines pass through high forest fire risk zone, and
insulation property of transmission under mountain fire condition is a critical issue needed to be considered during survey,
design and operation and maintenance. Gap discharge under
mountain fire condition is affected by high temperature, flame
conductivity (electron and ion) and large particles (smoke fog
and ash), etc. This article studied characteristics of leakage
current of different vegetation flames and the effect of flame
conductivity on wire-plate gap breakdown characteristics with
the sample of typical vegetation that causes line trip under
transmission line. Research result show that conductivity of
three kinds of typical vegetation flame is quite high, breakdown voltage is decreased obviously with rising of flame conductivity, and discharge pattern is transited from streamer
discharge lead to electric arc discharge. Discharge characteristic of different vegetation flames can be identification basis of
mountain fire risk region and dangerous vegetation, which
improves reliability of line under mountain fire condition.
Zhumao LuState Grid Shanxi Electric Power Research Inst.
Tianzheng Wang
State Grid Shanxi Electric Power Research
Inst.
Hua Yu
State Grid Shanxi Electric Power Research Inst.
Jichong Liang
State Grid Shanxi Electric Power Research Inst.
Yutong Chen
State Grid Shanxi Electric Power Research Inst.
Dongdong Yang State Grid Shanxi Electric Power Research Inst.
Yanpeng Li
State Grid Shanxi Electric Power Research Inst.
GIS equipment is widely used in electric power system, however, partial discharge affect the normal operation of the equipment. The paper introduces the principle of ultra-high frequency and acoustic emission partial discharge living detection
methods and SF6 gas decomposition detection. And this paper
introduces typical defect cases of partial discharge in GIS
equipment using different living detection method, combined
with on-line monitoring. The living detection result is verified
correctly after dismantlement, and analyses the reason of partial discharge. The final conclusion is that combined with ultra-high frequency on-line monitoring and a variety of living
detection methods can improve the detection efficiency for
insulation defects such as partial discharge in GIS equipment.
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TuC02.7
TuC02.9
Fault Simulation and Diagnostic Test for Abnormal Voltage of Secondary Coil of Capacitor Voltage Transformer
pp. 1617-1623
Fault Analysis and Structure Optimization of
40.5kV Wall Bushing
pp. 1628-1631
Hua Yu State Grid Shanxi ElectricPower Research Inst.
Hongkui Zhang
Gang Yang
State Grid Shanxi Electric Power Research Inst.
Rongyan Shang
Yutong Chen
Fucheng Lang State Grid LiaoningElectric Power Research Inst.
Corp Shenyang Research Inst.
Hua Qiao Univ.
Based on the explosion fault of wall bushing used in a 35kV
substation, analyzing operation environment, appearance inspection of bushing and electrical test on other bushings operating well, the key causes which lead to this failure were found:
design defects and high non-uniform electrical field distribution, simultaneously, heavy operation condition and high humidity are the exterior factors resulting in the explosion fault.
For improving the electrical performance of bushing and electrical field distribution, the new design with shield ring was
presented. At the same time, improvement solutions, adding
the heater and fan in busbar compartment, used to reducing
the humidity inside busbar compartment of switchgear were
present ed in this paper. After these improvement measures
were carried out, the switchgears operate very well in safe
condition.
State Grid Shanxi Electric Power Research Inst.
Zhumao Lu State Grid Shanxi Electric Power Research Inst.
Yongxin Liu State Grid Shanxi Electric Power Research Inst.
The transformer protection action is investigated and studied
caused by over-excitation due of capacitor voltage trans
-former secondary coil voltage that is increased. In order to
find the reasons of the transformer protection action, routine
tests, diagnosis tests are conducted and theses data are accord
with national standards. According to infield inspection, faults
simulation and analysis method are proposed which results
indicated that the protection action caused by electromagnetic
interference of the secondary loop. In order that prevent the
occurrence of similar failures, some suggestions for operation
and maintenance of capacitor voltage transformers are concluded.
TuC02.10
Characteristics of Gas-production and Electrical
Signal of Column-plate Model Under High- frequency Voltage
pp. 1632-1636
TuC02.8
Study on Artificial Contamination Test of Typical
Transmission Line Insulators
pp. 1624-1627
Chunhui Gu
Sihua Liu
Guangzhou Power Supply Co., Ltd.
Guojun Lu
Guangzhou Power Supply Co., Ltd.
Mancheng Yi
Guangzhou Power Supply Co., Ltd.
Jiangtao Li
China Coal Technology & Engineering Group
Qingmin Li
North China Electric Power Univ.
Ying Zhang
North China Electric Power Univ.
To elaborate the problems emerging from high frequency
stress on insulating system clearly and to provide assistance in
detection and measurement of high-frequency transformer, a
column-plate model is adopted as the test model under high
voltage both of high frequency voltage and power frequency
voltage. Electrical signal was captured with Rogowski coil
linked to the test model in the ground strap to measure the
induced voltage and the contents of key gases were measured
using Zhongfen 2000A gas-phase chromatographic instrument.
In this paper, the partial discharge inception voltage,
phase-amplitude diagram, the content and the proportion of
key gases generated under the constant high frequency voltage
are analyzed. Conclusions can be drawn from the tests that
high frequency stress boosts the degrading process of oil-paper
insulation system, and increases the content of key gases produced by oil-pressboard insulation system, indicating that insulating oil deteriorates severer than pressboard, but both
were much worse than those under the power frequency voltage. Furthermore, the partial discharge signals were increased
in frequency and reduced in amplitude, verifying the characteristics of gas-production.
Xi’an Jiaotong Univ.
Insulator contamination is an important technical problem
because contamination-caused insulator flashovers may cause
great damage to power system. Dust, waste, condensation and
so on give rise to serious influence to flashover accident. In
order to investigate the contamination distribution law of typical transmission line insulators, artificial contamination test is
carried out and equivalent salt deposit density (ESDD) is
measured under different conditions in pollution cycle device.
The influence of different wind speed, wind direction, number
of pieces is investigated to find the rules, which enables us to
better understand the contamination conditions of the insulators and take effective measures to prevent the pollution
flashover accidents.
November 26-29，2015 Changsha，China
N o r t h C h i n a E l e c t r i c Po w e r Un i v.
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TuC02.11
TuC03.2
The Study on the Partial Discharge and Insulation Aging Detection of Cable Based on the Chaotic Characteristic Parameter
pp. 1637-1642
Review of the Research on Icing Mechanism of
Transmission Lines and Ice-melting Technologies
pp. 1648-1652
T a o L i u C h a n g s h a U n i v . o f S c i e n c e a n d Te c h .
We iw e i H a o C h a n g s h a Un i v. o f S c ie n c e a n d Te c h .
Lixing Zhou
Changsha Univ. of Science and Tech.
Yu n fe n g Z h a iC h a n g s h a Un i v. o f S c ie n c e a n d Te c h .
Partial discharge (PD) and water tree is the important reason
to insulation deterioration of XLPE cable, So PD monitoring
and locating is an important means of cable operation and
maintenance. On the basis of the mechanism of cable’s PD and
the research of cable aging diagnosis, the Matlab Simulink
simulation model of XLPE is built, and the variation law of the
chaotic characteristic parameters of PD signal is studied. The
simulation results show that: with the increase of transmission
distance, the correlation dimension decreases with the decreasing of the logarithmic function, and the new method
based on chaotic characteristic is proposed.
The ultra-voltage background of the ice storm is briefly introduced, the formation mechanism of lines icing and influencing
factors are elaborated to provide a reference for Icing forecasts
and anti-icing methods; Ice-melting for icing lines is reviewed,
the applicable voltage levels for current method of Ice-melting
is given, and various methods of Ice-melting is comprehensively evaluated in terms of security, economical efficiency, operability, and the results indicate that for all of the Ice-melting
technologies, no one can possess all satisfactory security, economical efficiency and operability. Combined with the
Ice-melting principles and engineering needs, the simulation
calculation and test research of Ice-melting current and time
should be emphasized, so that better Ice-melting and energy
saving can be achieved. It is suggested that forecasting and
Ice-melting be laid as a core, and also the research can be
studied from icing mechanism and models, icing monitoring
and early warning, anti-melting, so that the ability of anti-icing
and mitigation can be continuously enhanced.
Shurong Peng Changsha Univ. of Science and Tec h .
TuC03.1
Application Effect Evaluation of Demon- stration
Project of Thyristor-controlled Phase Shifting
Transformer in 500kV Grid
pp. 1643-1647
TuC03.3
Yong Cui Electric Power Research Inst., SMPEC. Yinghui Yu Electric Power Research Inst., SMPEC.Zenghui Yang
R e s e a r c h
I n s t . ,
An On-load Test Method for the Y/Δ Converter
Transformer Base on Inrush Current
pp. 1653-1656
Electric Power
S M P E C .
Haosheng Huang
The considerably uneven distribution of power flow on 500kV
Anhui-Jiangsu cross province interface during peak hours may
contribute to overload conditions in case of outages on one of
the four transmission lines of this interface. Export of electric
power from Anhui province through this interface to Yangze
Delta load center is restricted to 4800MW. Installation of thyristor-controlled phase shifting transformer (TCPST) on each
of the 500kV cross province transmission lines from Dangtu
substation to Huifengshan substation is reviewed to be effective
solution for interface power flow control under various possible grid operation conditions. This paper evaluates the application effect of the demonstration project, which involves
power flow control impact on the interface and neighboring
system, short circuit current limiting effect with respect to the
impedance of TCPST under varying phase shifting angle as
well as system stability performance related issues. The evaluation is expected to provide theoretic basis for the implementation of the demonstration project.
Jiangsu Electric Power Research Inst.
Yu Liu
Jiangsu Electric Power Research Inst.
Xiangping Kong
Jiangsu Electric Power Research Inst.
Peng Li Jiangsu Electric Power Research Inst .
Yi Yang
Jiangsu Electric Power Research Inst.
For the Y/Δ converter transformer in the converter station,
the transformer has only two windings, and the on-load test
cannot be implemented to test the polarities of current transformers’ (CTs’) secondary loops. In order to fill this gap, a
novel polarity determination method for the CTs of the Y/Δ
converter transformer is presented in this paper. Firstly, the
configurations of CTs and relay protections for converter
transformer are introduced. Besides, the characteristics of the
inrush currents caused by charging the converter transformer
is also analyzed. Based on that, a polarity determination
method of CTs is proposed. The impact of harmonics on the
on-load test data of the converter transformer can be effectively avoided with the proposed method. The proposed approach is validated with the on-load test data of the practical
converter transformer.
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TuC03.4
TuC03.6
Series-CompensationParameter Determi- nation
Method of Transmission Lines with Consideration of Unbalance Degree
pp. 1657-1662
S-Transform Based Pilot Protection Method for
HVDC Transmission Lines
pp. 1667-1672
Wenzhe
Guibin Zou
Chen
Xi’an
Jiaotong
Z h a o
Univ.
Zhiguo Hao
Xi’an Jiaotong Univ.
Tao Du
Jun Guan
Xi’an Jiaotong Univ.
Wenjia Yang
Baohui Zhang
Xi’an Jiaotong Univ.
Xianguo Jiang
China Electric Power Research Inst.
Xingguo Wang
China Electric Power Research Inst.
L i
S h a n d o n g
U n i v .
Shandong Univ.
Shandong Univ.
State Grid Shandong Power Supply Company
Traditional traveling wave protection of HVDC line is easily
influenced by fault resistance, and the current differential
protection as backup protection has disadvantages of slow
operation speed and data synchronization, so this paper proposes a pilot protection method for HVDC line based on S
transform. Theoretical analysis shows, for a fault occurring on
the forward direction of the protection, the polarities of the
fault components of voltage and current detected by protection
are opposite, but for a backward direction fault, they are the
same. According to these characteristics, a new method based
on S transform angle differences to identify the fault direction
is presented. In addition, for a pole-earth fault in bipolar
HVDC systems, the faulted line can be distinguished from the
healthy line in terms of ratio differences of S transform transient voltage energies. Simulation results show that the proposed method can effectively identify internal and external
faults, the faulted line and lightning disturbance in different
fault conditions.
This paper discusses the formation of unbalance current when
series-compensated transmission lines operate normally, studies the principle of improving unbalance degree by adjusting
the series-compensation capacity within relatively tight bounds
of each phase, proposes the method of series compensation
parameters based on Nelder-Mead algorithm. A simulation
model of 750kV transmission lines was constructed. The results
show that this method can minimize zero sequence unbalance
degree and negative sequence unbalance degree respectively.
Moreover, the transfer capability of transmission lines almost
stays the same before and after the adjustment.
TuC03.5
TuC03.7
Research on DC Ice-melting Technologies for
500kV AC Transmission Lines
pp. 1663-1666
Measurement and Calculation of Potential
Shifting Current in ±800kV HVDC Converter Station
pp. 1673-1678
We iw e i H a o C h a n g s h a Un i v. o f S c i e n c e a n d Te c h .
Shurong Peng
Jiazheng Lu
Changsha Univ. of Science and Tech.
Hunan Electric Power Company
T ian Wu China Electric Power Research Inst .
Some technical details of DC ice-melting device and its application is introduced.And core components and structural program of DC Ice-melting device are studied from performance
and price aspects.The practical functions of lines drawing,
shorting scheme and the related knife gate are described.The
harmonic analysis and calculation of the related parameters
are carried out under the establishment of matlab simulation
model according to the ice-melting needs for 500kVAC transmission lines,and accordingly the DC ice-melting plan is given.In conclusion,the combing method of the uncontrolled and
controlled rectifier can address 500kV AC transmission lines
icing of different line types,different ice thickness and different
distance under complex climatic conditions.
November 26-29，2015 Changsha，China
Kai Liu
China Electric Power Research Inst.
TingLiu
China Electric Power Research Inst.
Bin Xiao
China Electric Power Research Inst.
Yong Peng
China Electric Power Research Inst.
Ziming Su
China Electric Power Research Inst.
Pan Tang
China Electric Power Research Inst.
Xinglie Lei
China Electric Power Research Inst.
The reliable and stable operation of ultra HVDC transmission
system contributes to the safe operation of the power grid, thus
to carry out live working is of great significance in converter
station. Shift of potential is the most important aspects of entering equal-potential. At the moment of shift of potential, the
strong arc and large pulse current will occur between the bus
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
and operation worker. Research on the characteristics of the
potential shift current is benefit to take appropriate protective
measures. Based on NI9165 wireless data acquisition card
pulse current measurement system was applied to measure
potential shifting currents during the process of entering +800
kV DC converter station bus. According to the characteristics
of access to DC converter station polar bus equal-potential,
potential distribution and capacitor between worker and polar
buses were studied using the electromagnetic analysis software
in the process of entering the equal potential. Equal potential
transfer analysis model was built according to these parameters and potential shifting current were calculated in UHV DC
converter station. Entering potential shifting current pulse is of
the highest value 150 A with positive and negative polarity
pulse, pulse width for dozens of μs in the process of entering
equal-potential. Potential shifting current simulation calculation results is that maximum is 190 A, pulse width of 10 μs.
Calculation and measurement results show that the potential
shifting current UHV DC converter station is far less than
UHV AC lines. such as potential in the process of potential
shifting current pulse is mainly caused by the arc extinguish
and renewed between bus and workers repeatedly, and workers should be quick into and out of the equal-potential during
contacting and out of a live conductor, in order to avoid arc
burns damage to workers, potential shifting bar is recommended to use during into and out of the bonding process.
TuC03.9
Vibration Modal Analysis and Calculation of A
New HVDC Converter Transformer with Inductive Filtering Method
pp. 1683-1688
Yuehui Chen
State Grid Hunan Electric Power Company
Yong Li
Hunan Univ.
Yanjian Peng
Hunan Univ.
Longfu Luo
Hunan Univ.
In this paper, the vibration modal characteristics are investigated for a new high-voltage direct current (HVDC) converter
transformer with inductive filtering method. A 3-D finite element model of the transformer is established by means of
ANSYS and used to extract natural frequencies and vibration
modes of the windings and cores of the converter transformer.
First, a new converter transformer based on the inductive filtering is proposed, and its physical structures are described in
brief. Then, 3-D model of windings of the new converter
transformer is established to calculate the vibration mode.
Then, the vibration mode of iron core is investigated, and an
effective method of installing pre-tighten clamping is proposed
to reduce the vibration of iron core. Finally, the vibration mode
of whole transformer is investigated and the results show that
proposed transformer has a good performance in vibration.
Besides, the proposed vibration modal analysis is useful for the
design of the new HVDC converter transformer. Based on the
vibration analysis results, we can take the corresponding
method to reduce the possibility of resonance caused by harmonic currents.
TuC03.8
Study on Reactive Control Strategy of UHVDC
Transmission Project
pp. 1679-1682
P e n g We i J i a n g s u E l e c t r i c P o w e r R e s e a r c h I n s t .
Qian Zhou
Jiangsu Electric Power Research Inst.
Jiankun Liu
Jiangsu Electric Power Research Inst.
Chenggen Wang
Jiangsu Electric Power Research Inst.
TuC03.10
Transformer model with Hysteresis characteristic for Electromagnetic transients based on
PSCAD/EMTDC
pp. 1689-1694
To keep normal running of UHVDC in addition to the active
control reactive power control were needed to maintain a
normal commutation voltage of converter valve. Reactive
power control need coordinate with priority of each level control when considering filtering and voltage stability. Traditional reactive power and voltage control does not generally consider the priority issues of reactive power control. In order to
analysis the mechanism of reactive power and voltage control
of UHVDC. Take the ±800kV Jinsu UHVDC as background,
based on the study on the filter configuration, detailed analysis
of the relationship between the priority of the five control levels for reactive and voltage control as well as the its control
principles were make. Research results indicates that the reactive power control strategies of UHVDC have five levels as abs
min filter control, Umax/Umin control, Qmax control, min
filter control and U/Q control under priority from low to high.
Xiaohua Li
Electric Power Col. South China Univ. of Tech.
Jiaqi Wu
Electric Power Col. South China Univ. of Tech.
Chao Ye
Electric Power Col. South China Univ. of Tech.
Lizhu Wu
Electric Power Col. South China Univ. of Tech.
Dongyi Zhang
Electric Power Col. South China Univ. of Tech.
Xiaobing Ding
Power Dispatching and Communication
Center of CSG
To analyze the complex sympathetic inrush characteristics of
HVDC and study the methods of suppression, making up the
blank of Electromagnetic transient simulation software of
PSCAD/EMTDC not considering the hysteresis characteristics
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
of ferromagnetic material of transformer cores as well, a new
three-phase transformer model with hysteresis characteristic
for electromagnetic transients based on the PSCAD/EMTDC is
presented, which derives from the ideas of the transformer
model considering hysteresis characteristics in ATP-EMTP, it
consists of Type96 and BCTRAN. This model adds magnetizing branch considering hysteresis characteristics based on
UMEC model. It's full use of the advantages of UMEC model,
without using winding turns, the core cross-sectional area, the
core length, etc, and the hysteresis characteristics of transformer can be described when using experimental data obtained. The simulation results show that the model both have
high simulation accuracy, and because the parameters readily
available, it's easy for user to use in PSCAD/EMTDC and to
promote the use of the transformer model in engineering application when considering transformers with hysteresis characteristics.
TuC03.12
Wind Accident Analysis of Transmission Line in
China Southern Power Grid’s Coastal Regions
pp. 1700-1704
T ianwei Li Electric Power Research Inst ., CSG
Bing Luo
Lei Liu
Tian Wu
Electric Power Research Inst., CSG
Electric Power Research Inst., CSG
China Electric Power Research Inst.
There are some transmission lines in China Southern Power
Grid suffered from frequently typhoon in recent years. That is,
typhoon will threaten power system’s safe and steady operation for long. It’s necessary to analyze statistically wind accidents in China Southern Power Grid’s Coastal Region, including Coastal Region in Guangdong, Guangxi and Hainan province. In this paper, the wind accidents of transmission line are
systematically generalized and summarized according to dif-
TuC03.11
ferent voltage classes, including trips, collapsed tower, broken
line, damaged fitting, etc. The reasons are further and con-
Research on Excitation Deicing for Transmission
Line with Considering the Deicing Power Attenuation
pp. 1695-1699
cretely analyzed from design, construction and operation.
Q u n w e i J i n g C h a n g s h a Un i v. o f S c i e n c e a n d Te c h .
against typhoon.
Yusheng Zhou
Then, The impact of two powerful typhoons “Ute” and “Usagi”
to transmission lines are analyzed in detail. The results above
will provide reasonable basis on reinforcing transmission lines
Changsha Univ. of Science and Tech.
L i a n g L i u C h a n g s h a U n i v. o f S c i e n c e a n d Te c h .
TuC03.13
Transmission line icing is a common natural disaster in southern China with great harm to the security operation of power
systems. Deicing method with high-frequency excitation has
the advantages of small ice-melting current and high
ice-melting efficiency, but over high operating frequency and
voltage would produce electromagnetic interference to the
surrounding radio communication, cause corona loss to reduce
the effect of melting ice, and may increase the cost of manufacture high-frequency excitation equipment. In this paper,
uniform transmission line theory is used to determine the optimum operating frequency and voltage of the excitation
source with considering the deicing power attenuation. The
excitation deicing method with parameters 3kHz/11kV and
deicing effect are identified, using MATLAB and ANSYS simulation to verify its feasibility and comparing the deicing effect
with DC shorted deicing. The research result shows the superiority of deicing that it reduces ice-melting current and power
capacity, and reduces the ice-melting time to improve deicing
efficiency. The electromagnetic interference, corona loss, and
the manufacturing cost of the excitation source are also reduced.
November 26-29，2015 Changsha，China
Analysis on HVDC Start-up in System Black-start
pp. 1705-1709
Guanghu Xu
China Southern Power Grid
Liang Tu
China Southern Power Grid
Haiwen Lan
South China Univ. of Tech.
Chengjun Xia
South China Univ. of Tech.
The start-up of HVDC will bring impact of active and reactive
power to the grid, causing voltage and frequency disturbances.
This paper analyses the effects of different HVDC start-up
modes to AC system and selects the most appropriate one. Besides, the paper puts forward the method of estimating short
circuit ratio and effective inertia constant of AC system to meet
the operation requirements of voltage and frequency in both
transient and steady states and verify the accuracy by the simulation of Yunguang HVDC.
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
reclose overvoltage was lower than that of close overvoltage.
It’s appropriate to close the circuit breaker on source side
after closing the circuit breaker on the load side to avoid damaging the potential transformer joint with the bus of load. The
amplitude of close overvoltage when the transmission line was
whole headline was lower than that when the transmission line
was headline and cable. It’s really possible to occur resonance
overvoltage if the transmission line was the whole cable. The
amplitude of the over-voltage can be reduced only if the suitable operation types and running types.
TuC03.14
Principle Research on Suppressing Harmonic Instability of HVDC Transmission by Using an Inductive Filtering Method
pp. 1710-1714
Guandong Zhou State Grid Hunan Electric Power Company
Yong Li
Yuehui Chen
Longfu Luo
Yicheng Zhou
TuC03.16
Hunan Univ.
State Grid Hunan Electric Power Company
Combined Fault Location Algorithm for HVDC
Transmission lines Based on Natural frequency
pp. 1720-1725
Hunan Univ.
Fujitsu Corporation
Duan
Harmonic stability is easily excited once there are
non-characteristic harmonics in HVDC transmission, who
operates on the unbalance condition or has disturbance of
converter control system. This paper concerns the
core-saturation-type harmonic instability, and presents a new
concept that using inductive filtering method to solve harmonic
instability fundamentally. First, the mechanism of harmonic
instability generation is analyzed. Then, a new HVDC transmission based on inductive filtering method is introduced
briefly, and its equivalent impedance network is established.
Based on this, a frequency scanning method is presented to get
the impedance-frequency characteristics of the new HVDC
transmission. Besides this, for comparative study, the CIGRE
HVDC benchmark model is also analyzed. Research results
indicate that the application of inductive filtering method
changes the resonance frequency, and it can avoid the harmonic instability caused by low-order harmonic resonance.
Xi’an
Zhao Zhao
Un iv.
of
Te c h .
Xi’an Univ.of Tech.
Liu Jing
Xi’an Univ. of Tech.
In frequency domain, there is a certain mathematical relationship between the natural frequency and the fault distance. But
model mixing is still the problem haven’t been solved well yet,
it brings difficulty in gaining the natural frequency. A combined fault location algorithm for HVDC transmission line
based on natural frequency is proposed in this paper, in which
time domain and the frequency domain is combined together.
On the one hand, in time domain, wavelet analysis was used to
calculate rough fault distance. Then through the relationship
between the fault distance and the natural frequency, the
rough natural frequency was obtained. On the other hand,
wavelet packet was used to divide the frequency into several
specific ranges, and then find out the range of rough frequency.
At last, multiple signal classification algorithm was used to
obtain the frequency, and the fault distance was obtained. The
algorithm has been performed a lot in PSCAD. The validity of
the algorithm has been verified.
TuC03.15
Differentiation Research on Closing Overvoltage
of Headline-cable Comprehensive Transmission
Type with Double Circuit Transmission Lines on
Same Tower
pp. 1715-1719
TuC03.17
Field Study of A Novel Dynamic Rating System
for Power Transmission Lines
pp. 1726-1731
Fucheng LangState Grid Liaoning Electric Power Research Inst.
Hongkui Zhang
Jiandong
China Coal Tech. & Engineering Group Corp
Shenyang Research Inst.
Wei Bao State Grid Zhengzhou Power Supply Company
Yuehao Yan
To research the close overvoltage transient characteristic of
headline-cable comprehensive transmission type with double
circuit transmission lines on same tower, a 220kV power system was selected to build the transient model of headline-cable
comprehensive transmission type with double circuit transmission lines on same tower by EMTP, the characteristics of the
close overvoltage and the reclose overvoltage after single phase
grounding fault were researched totally. Ultimately, the main
factors effect on close overvoltage were analyzed. The results
demonstrated that the amplitudes of overvoltage were mainly
related to close phase angles with its range from 1.17p.u to
2.14p.u. It’s best to close at the phase angle from 210°-240°
considering the characteristic of arrester. The amplitude of
State Grid Zhengzhou Power Supply Company
WeizhengZhangState Grid Zhengzhou Power Supply Company
Jun Xin
State Grid Zhengzhou Power Supply Company
Zhengrong Li
Shanghai Hinner Tech. Co., Ltd
Rui Tang
Shanghai Hinner Tech. Co., Ltd
In the modern power grid, the dynamic rating technology of
transmission line has been drawing more and more attention.
Through on-line monitoring devices installed on transmission
lines, the conductor temperature, environment temperature,
wire current and sunshine intensity are monitored in real-time,
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
frequency sinusoidal alternating current, to analyze the mechanism of DC bias caused by GIC impacting the system voltage
in this paper. Based on the simulation model, the variations of
transformer reactive power consumption and system voltage
are recorded. In addition, the impact of GIC on the generator
output is studied. The results indicate that the consumption of
transformer reactive power increases periodically with the
increasing of GIC, which results in the periodic reduction of
system voltage and decrease of generator output.
which provides solid theoretical basis of raising line short-term
transmission capacity Developing dynamic rating system can
effectively and safely raise short-term transmission capacity of
transmission lines, to satisfy the demands for power supply
under emergency. By the analysis of the principle, structure,
and functions of transmission line dynamic rating system. The
risk aversion strategy are derived based on the simulated research and field test data to improve the ampacity. The proposed method such as safety current under the limited time
and safety operation time under the limited current provide
feasible measures for dynamic rating of transmission lines.
TuC03.18
TuC04.1
Based on the LCC calculation method of the
economic current density
pp. 1732-1735
Investigation study for double circuit lightning
trip incident at 275kV overhead line network in
Malaysia
pp. 1740-1745
Wa n g we i J i N o r t h C h i na E l e c t r i c Po w e r Un i v.
Yajing Gao
North China Electric Power Univ.
Qing Xie
North China Electric Power Univ.
Jing Li
North China Electric Power Univ.
Boniface. H.K. Chia
Lightning outage has always been a major concern for power
utilities operating tropical region which is experiencing high
level of lightning activities. Syarikat SESCo Berhad in Malaysia is one of the utilities facing the challenge in achieving decent lightning performance of the lines. This paper presents an
investigation study on the suspected double circuit lightning
trip incident at 275kV overhead line network in Malaysia. The
lightning outage will be investigated based on four study aspects, vitz. shielding failure flashover, backflashover, induced
flashover and mid-span flashover.The input to the calculation
will be based on recorded data and the typical design parameters for existing 275kV line.
Selection of total cross-section and split type for transmission
line conductor is an important factor in obtaining good economic benefits during the entire life-cycle of AC power transmission projects. Economic current density is an important
reference for line cross-section selection. The traditional economic current density algorithm exist the following problems:
1. Traditional algorithm ignores the influence of line maintenance cost, spare parts cost and the retirement cost. 2. Electricity price and wire price are important factors affecting
current density. Obviously the current price is different with
the 80s. The method of traditional ignores the time value of
money and think the price as constants. This paper presents a
method which is based on the theory of LCC to solve the above
problems. Each cost function expression of line section is fitted
out with plenty of practical engineering data. Finally, a practical case study is employed to verify the feasibility and effectiveness of the method and model proposed on the completed
transmission line.
TuC04.2
Study on the Affection of Ground Grids with
Varied Aspect Ratio on Frequency Characteristics
of Grounding Impedance
pp. 1746-1751
TuC03.19
The Impact of GIC on System Voltage and Generator Output
pp. 1736-1739
Hanli
WengChina
Three
Gorges
Univ.
Guowen Yang
China Three Gorges Univ.
Xuehua Li
China Three Gorges Univ.
Xiangning Lin
China Three Gorges Univ.
Chunjiang Hu
Gansu Electric Power Research Inst.
Dingjun Wen
Gansu Electric Power Research Inst.
Yaming Sun
Gansu Electric Power Research Inst.
Kang Liu
Gansu Electric Power Research Inst.
Zhijie He
Southwest Jiaotong Univ.
Lijun Zhou
Southwest Jiaotong Univ.
In order to study ground grids with varied aspect ratio impact
on grounding impedance, this paper considers the characteristics of the transient electromagnetic conductors and compares
frequency characteristic curve of grounding impedance, after
the simulation and calculation based on the CDEGS,which is
famous for measuring the grounding resistance in the world.
The results show the inductive component of grounding impedance is related to injecting point of ground short-circuit
current. As the aspect ratio of ground grids decrease at power
frequency, the resistive component of grounding impedance
Aiming at the phenomenon of the system voltage decrease in
the case of geomagnetic storms, a Geomagnetically Induced
Current (GIC) -Direct Current (DC) bias simulation model
with 2 generators and 5 buses based on the PSCAD/EMTDC
platform is established, in which the GIC is simulated by low
November 26-29，2015 Changsha，China
Syarikat SESCo Berhad
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
lished. Through the calculation of the traditional distribution
transformer model parameters and the study of energy equivalence principled, this paper puts forward a method to calculate the resistance, inductance and distributed capacitance
parameters of the lighting transient model. And the parameters of S-11-M-100/10 distribution transformer are calculated
as an example. This paper simulates the simple distribution
network with a distribution transformer model in lightning
stroke using PSCAD.By analysis on the waveforms of distribution transformer for both high and low voltage side in three
kinds of lighting stroke,this paper shows the lightning hazards
of distribution transformers.
becomes greater and greater. The impact of grounding impedance under five different aspect ratio is compared at several
frequencies other than power frequency, by parameter calculation and simulation analysis, the results indicate the design of
large substation ground grids should be made with an aspect
ratio of 6/5:5/6, and perhaps could be set as a standard in
grounding system design and modification in distribution substations.
TuC04.3
TuC04.5
Study on the Frequency Characteristics of
Grounding Resistance in Non-uniform Soil
Regions
pp. 1752-1756
Chunjiang Hu
Gansu ElectricPowerResearch Inst.
Dingjun Wen
Gansu Electric Power Research Inst.
Yaming Sun
Gansu Electric Power Research Inst.
Yushuo Wu
Gansu Electric Power Research Inst.
Ying Chen
Southwest Jiaotong Univ.
Lijun Zhou
Southwest Jiaotong Univ.
Simulation Study on Lightning Protection of
Distribution Transformer with Z inc Oxide Arrester
pp. 1763-1767
Mengqian Hou
Shandong Univ.
Houlei Gao
Shandong Univ.
Shuai Zhang
Shandong Univ.
Fei Wang
Shandong Univ.
Currently, few researches related to lightning protection of
distribution transformer with zinc oxide arrester are reported
on both home and abroad. This paper establishes a model of
zinc oxide arrester and distribution transformer under lightning stroke. In order to verify the lightning protection of zinc
oxide arrester to distribution transformer, two distribution
network simulations are carried out by using PSCAD. One is
the condition without zinc oxide arrester, another one is with
zinc oxide arrester to be installed in distribution transformer’s
high voltage side. Besides, this paper also carries out a distribution network simulation with zinc oxide arrester installed in
both high voltage side and low voltage side of a distribution
transformer. The importance of zinc oxide arrester for preventing distribution transformer from damage of lighting is
shown by comparison of different simulation results.
The grounding system is an important measure to maintain
reliable operation of power systems and ensure the safe of
equipment and human body. Grounding resistance is an important parameter to judge whether the grounding system
meets the requirements. This paper aims to study the frequency characteristics of grounding resistance in non-uniform soil
regions. By using the software CDEGS, a three-layered soil
model was made,and the simulations of the influence of upper
soil resistivity, upper soil layer thickness, middle soil resistivity,
middle soil thickness and lower soil resistivity on grounding
resistance based on horizontal three-layered soil structure were
carried out. And the frequency characteristics of grounding
resistance under several situations were studied. It is concluded that frequency has a greater effect on grounding resistance
in the areas with higher resistivity and smaller thickness of
upper soil.
TuC04.6
Study on Lightning Characteristics of Mountain
Transmission Line
pp. 1768-1771
TuC04.4
Establishment and Simulation of Distribution
Transformer Transient Model under Lightning
Stroke
pp. 1757-1762
Yong Sun
Shandong Electric Power Research Inst.
Linli Zhang
Shandong Electric Power Research Inst.
Mengqian Hou
Shandong Univ.
Houlei Gao
Shandong Univ.
Xiaogang Gao
Jibei Electric Power Company
Xiaobo Wu
Jibei Electric Power Company
Zhange Liu
Jibei Electric Power Company
Dexuan Sun
Jibei Electric Power Company
Muwen Li
Jibei Electric Power Company
Huimin Gao
Jibei Electric Power Company
Lightning accident is an important cause of transmission line
failure. Although the study on lightning characteristics of
transmission line have conducted a lot both at home and
By analyzing the characteristics of the lightning current and
traditional distribution transformer model, a transient distribution transformer model under the lightning stroke is estab-
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
abroad, safe and reliable operation of the transmission line
must depend on the design of tower grounding and lightning
protection measures according to the structural characteristics
of the transmission line itself. In this paper, the researchers
study the transmission line in Qinglong mountain area and
carry out the relevant fundamental research and analysis on
the mountains lightning performance of transmission line,
which provides a reference for design and operation of transmission line mountain area.
charge detection for cable insulation is an important means to
find the cable insulation defects and assess state of the cable
insulation. Partial discharge signals from different sources
have great harm to the power equipment, so pattern identification is an important purpose in this research. First, the four
kinds of discharge waveforms are processed by de-noising
preprocessing, then discharge waveforms are decomposed by
wavelet packet, and finally the energy percentage in different
frequency bands can be obtained. Studies show that when the
type of discharge signal is different, the wavelet packet coeffi-
TuC04.7
cients in the distribution of each band is also different. So energy percentage of the wavelet packet coefficients can be used
Fault Diagnosis of Substation Grounding Grid
Based on the Signal Distance Function
pp. 1772-1775
Liqun Shang
Xi’an University of Science & Tech.
Wenli Liang
Xi’an University of Science & Tech.
for discharge signal feature recognition. In this paper, SVM
binary classification is first extended to multi-classification by
M-ary algorithm, then the feature vectors composed by energy
percentage of the wavelet packet coefficients are inputted into
SVM for recognition. The recognition results of test samples
show that feature vectors composed by the percentage of en-
Good grounding condition is great important to keep the safety
of staff and stable operation of electrical equipments in the
substation. Electric power system is an urgent need for practical and effective diagnostic method without excavating the
grounding grid and affecting the normal operation of the system, which can look for the location of corrosion and diagnose
the degree of corrosion of grounding grid, so as to evaluate
safety performance of grounding. This paper adopts the electromagnetic induction principle, pours the excitation current
of different frequency sine wave into the grounding through
CDEGS analysis software of grounding grid, simulates and
analyzes the distribution of magnetic induction intensity in the
surface; diagnoses the defects state of grounding grid conductors according to the change of distributional characteristics;
calculates the value of the signal distance function for the distribution of magnetic induction intensity when the grounding
grid conductors is in the corrosion and breakage; and finds out
the specific difference of the each waveform according to the
value of mutual distance, to achieve the fault diagnosis of
grounding grid.
ergy of wavelet packet coefficients can well reflect the characteristics of the original signal, and the method based on SVM
has better recognition performance.
TuC05.2
Evaluation of the Calculation Method for Stray
Losses in Structural Parts of HVDC Converter
Transformers
pp. 1780-1785
TuC05.1
The Feature Extraction and Pattern Recognition
of Partial Discharge Type Using Energy Percentage of Wavelet Packet Coefficients and Support
Vector Machines
pp. 1776-1779
Jia Xu
South China University of Tech.
Haiqing Niu
South China University of Tech.
Riliang Hu
Yaqing Liu
Huazhong University of Science and Tech.
Dandan Zhang
Huazhong University of Science and Tech.
Zhenbiao Li
Huazhong University of Science and Tech.
Qinqing Huang
Huazhong University of Science and Tech.
Menghu Li
Huazhong University of Science and Tech.
Bin Li
Huazhong University of Science and Tech.
Jian Liu
Huazhong University of Science and Tech.
Stray losses in structural parts are calculated separately during determining load losses of HVDC converter transformers,
but the calculation method proposed by IEC 61378-2 standard
shows significant difference from the experimental results. The
nonlinearity, hysteresis losses, and frequency characteristic are
thought as the sources of errors in this paper, and then an
electromagnetic-circuit coupling FEM analysis is performed to
investigate them. It is shown that the frequency characteristic
Southern Power Grid
of the stray losses is the major factor that causes the errors,
Partial discharge is an important cause of the deterioration of
and the material characteristic should be considered. The
the cable insulation condition, and also an important manifes-
magnetic and nonmagnetic materials are suggested to be cal-
tation of the deteriorated insulation condition. Partial dis-
culated separately.
November 26-29，2015 Changsha，China
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
TuC05.3
TuC05.5
Research of VFTO in 110kV Minimized GIS
pp. 1786-1789
Zhiguo Hao
Xi’an Jiaotong Univ.
The Research and Application of Ultrasonic Imaging Technology in Transformer Internal Fault
Detection
pp. 1795-1799
Jie Guo
Xi’an Jiaotong Univ.
Zhipeng Wang
Shanxi Electric Power Research Inst.
Xuan Wang
Shanxi Electric Power Research Inst.
Tianzheng Wang
Shanxi Electric Power Research Inst.
Hua Yu
Shanxi Electric Power Research Inst.
Tao Jin
Shanxi Electric Power Research Inst.
Qifei He
Xi’an Jiaotong Univ.
110kV minimized gas insulated substation (GIS) has been
widely used in China, due to its great electrical properties. The
closing or opening operation of disconnector switches (DS) and
circuit breaker (CB), and single-phase ground fault are all
probable to cause the very fast transient overvoltage (VFTO),
which is a threat to the power system. Compared to the structure of higher voltage GIS, three-phase electrical equipment in
110kV minimized GIS is placed in the same box. So we must
establish the three-phase model of GIS and then calculate its
VFTO. This paper referred to 110 kV minimized GIS power
system. Using the Electro-magnetic Transient Program
(EMTP), numerical simulation and analysis of VFTO in different DS, CB operation modes and single-phase grounding
fault were carried out. And the data of VETO under different
operation modes, including the frequency, amplitude, steepness
and waveform were obtained. Then it calculated and analyzed
the influence on VFTO of length of branch bus and transformer entrance capacitance, in order to provide reference
basis to the structure design of GIS and analysis of VFTO.
In view of the complex internal structure of the transformer,
this paper presented the theoretical foundation of high sensitivity ultrasonic sensor signal receiving mechanism, and the
relationship between ultrasonic signal amplitude modulation
information and the location and shape information of the
transformer internal structure. Through the study of ultrasound folding and reflection law in different internal media of
transformer, the relationship between ultrasonic signals and
the transformer internal structure is revealed, and the internal
structure of transformer is imaged.
TuC05.6
TuC05.4
Research on Control Technology of Permanent
Magnetic Operating Mechanism for Vacuum
Circuit Breaker
pp. 1800-1803
Development and Experiment of Fast Breaker-Type Fault Current Limiter
pp. 1790-1794
Feng Gao
Ningxia Electric Power Company
Shaogui Ai
Ningxia Electric Power Company
Ran Ding
Ningxia Electric Power Company
Yongning Huang
Ningxia Electric Power Company
Fucheng Lang
Electric Power Research Inst. of Liaoning
High Voltage and Large Current Laboratory of State Grid Corp.
Hongkui Zhang
China Coal Tech. & Engineering Group Corp.
In order to improve the reliability of mining electrical equipments and to ensure the safe operation of power system in coal
mine, a design scheme of mining permanent magnet sealed
vacuum circuit breaker operating mechanism control system
was proposed. Hardware circuit and software program of control system were designed on the basis of PIC single chip microcomputer, including IGBT drive circuit and the control
Fault current limiter (FCL) is one of the efficient technological
measures to solve the increasingly serious problem of excessive
short-circuit current in power grid. A fast breakertype fault
current limiter with modularized design is developed on the
basis of 12kV fast-speed vacuum breakers and shortcircuit
current perfect forecast and zero-cross point precise phase
controlled breaking technologies. Zero-loss of the FCL is obtained under normal condition and up to 80 kA short-circuit
current could be limited within 20ms to the safe breaking level
of the system circuit breaker. The security, efficiency and reliability of the device are verified by field operation and two
single-phase transient short-circuit experiment in a 330 kV
network.
signals transport circuit. Research the IGBT action over voltage buffer technique and hardware anti-jamming technique.
The experiment shows that the system can control the permanent magnetic actuator to drive mine permanent magnet
sealed type vacuum circuit to complete the breaker switching
operations, which meets the design expectations.
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
partial discharge in the environment with low SNR and strong
electromagnetic interference, thus it can improve the sensitivity and anti-jamming ability to detect power transformer operation of the system.
TuC05.7
Design and Simulation of Cylindrical Linear Induction Motor Mechanism Based on F inite Element Analyze
pp. 1804-1808
Hongkui Zhang
Fucheng Lang
TuC06.1
China Coal Tech. & Engineering Group Corp.
Shunt Capacitor Bank Protection in UHV Pilot
Project
pp. 1813-1817
Electric Power Research Inst. of Liaoning
High Voltage and Large Current Laboratory of State Grid Corp.
According to the requirements on operating mechanism of
movement characteristics during the opening and closing of
40.5 kV vacuum circuit breaker， a new type of motor drive
operating mechanism- cylinder linear induction motor (CLIM)
mechanism was designed in this paper. And magnetic field and
some characteristics of (C-LIM) was analyzed using finite element method, and (C-LIM) design validity is proved. Based on
higher requisition of the characteristics of breaker operating
mechanism when operating and closing the motor mechanism
movement characteristics was built and load model of system
is analyzed, and the optimized velocity curve of the contacting
also planned in the paper. Pointing at ending effect of C-LIM
mathematical model of vector control system is built when
consider dynamic vertical ending effect, and simulated of the
mechanism control system for driven by (C-LIM) in MATLAB
environment. C-LIM model is successful in putting it through
a test on circuit breaker rated 40.5kV and satisfy requirements.
The results show that it can get a good dynamic performance,
small vibration and perfectly meet the requirements of mechanism movement characteristics during the opening and closing
of circuit breaker when the linear motor direct drive circuit
breaker actuator operating shaft, and still lay the foundations
of circuit breaker intelligence control.
ZheZhao Zeng
Changsha University of Science & Tech.
China Southern Power Grid
The Research of Live Working Gap Discharging
Characteristics on UHV Steel Tubular Tower
Transmission Lines
pp. 1818-1821
Xinglie Lei
China Electrical Power Research Inst.
Kai Liu
China Electrical Power Research Inst.
Ting Liu
China Electrical Power Research Inst.
Bin Xiao
China Electrical Power Research Inst.
Yong Peng
China Electrical Power Research Inst.
Tian Wu
China Electrical Power Research Inst.
Ziming Su
China Electrical Power Research Inst.
Pan Tang
China Electrical Power Research Inst.
Along with the construction and development of UHV project,
the steel tubular towers have been widely used in projects of
UHV transmission lines. In order to ensure the safety of live
working on UHV steel tubular tower transmission lines, this
article compares the electric field distributions around UHV
steel tubular tower and angle-steel tower through simulating
calculation; obtained the impulse discharging characteristics of
various typical live working conditions through 1:1 steel tubular tower model test, and determined the safety distance for
live working under various conditions; through impulse discharging test of both steel tubular tower and angle-steel tower,
analyzed the difference of impulse discharging characteristics
between the two typical structures. The research result can
provide a technical support for live working on UHV steel tubular tower transmission lines.
It is significantly difficult to make well detection of transformer operating conditions in the environment with strong noise
and electromagnetic interference. This paper presents Duffing
oscillator model transformation based on the generalized time
scale and the weak partial discharge signal can be detected by
the use of ultra high frequency (UHF) partial discharge detection on the model, thus the operation of transformers is acquired. The theoretical analysis and simulation results show:
this new method not only with chaos and noise immunity of the
good, but also can detect faint pulse signals of transformers
November 26-29，2015 Changsha，China
Taoxi Zhu
TuC06.2
Transformer 's UHF Partial Discharge Signal Detection Based on Converted Duffing Oscillator
Model
pp. 1809-1812
Changsha University of Science & Tech.
China Southern Power Grid
The configuration and setting of shunt capacitor bank protection is very important to ensure the safety of power system and
power equipment. This paper introduces the shunt capacitor
banks connection and shunt capacitor banks protection configuration of the UHV pilot project from Southeast Shanxi via
Nanyang in Henan province to Jinmen in Hubei province. The
application principle on the configuration and setting of this
110kV shunt capacitor banks protection is studied and discussed in detail. The principle to ensure the safety of power
equipment is chiefly taken into account in order to achieve a
reasonable configuration and setting.
TuC05.8
ZhenYuan Yang
Qing Tian
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TuC06.3
TuC06.5
Application of Long Tonnage Composite Insulators on UHVDC V-Type Strings
pp. 1822-1826
Research on Impacts of Bipolar Blocking in Jinsu
UHVDC on Stability of Receiving-end System
pp. 1830-1833
Guanjun Fu
Peng Wei
Jiangsu Electric Power Research Inst.
Jiankun Liu
Jiangsu Electric Power Research Inst.
Yongxin Gong
State Grid Energy Research Inst.
CEC Huada Electronic Design Co.,Ltd.
Qian Zhou
In UHVDC transmission projects, long tonnage composite
insulators with mechanical strength of 300kN and above will
be widely used for V-type strings. Research on operating mechanical characteristics of long tonnage composite insulators is
the basis for properly insulator selecting. In this paper, finite
element model of overhead transmission line as well as mechanical model for V-type composite insulator verified by load
test was constructed. In view of the application of composite
insulator FXBZ-800/550 on UHVDC V-type strings, the dynamic tensile and compressive loads under the dynamic operating conditions such as ice shedding, wind swaying and conductor galloping were studied through numeric simulation, so
were the influences of ice thickness, wind velocity and galloping amplitude to the insulator loads, and furthermore, the amplification ratio of dynamic peak loads relative to their corresponding static loads was obtained. This research results can
provide theoretical references for developing long tonnage
composite insulator dynamic load reliability test and selecting
its safe coefficient.
Chenggen Wang
TuC06.6
Research on Impacts of UHVDC Transmission on
Operating Stabilities of Receiving-end Power
Gr i d
pp. 1827-1829
Peng Wei
Jiangsu Electric Power Research Inst.
Jiankun Liu
Jiangsu Electric Power Research Inst.
Chenggen Wang
Jiangsu Electric Power Research Inst.
For receiving-end system that has larger percent of power
from outside, if UHVDC bipolar blocking occur, there must
have some impact on grid security and stability. Take Jinsu
UHVDC as background, based on the typical summer peak
data of Jiangsu power grid, electromagnetic transient model of
Jinsu UHVDC project was established in ADPSS containing
detailed DC control system; In addition, the remaining part of
Jiangsu power grid and electromechanical transient model of
the sending equivalence grid were established, the influence of
Jinsu UHVDC bipolar blocking on angle of power plant surrounding power, surrounding reactive power, voltage and grid
frequency. Results shows that: After the bipolar blocking,
power angle of plant near the placement unit stability can be
maintained, reactive power of the plant is reduced after shortly
increase first, 500kV voltage nearby fluctuate maximum of
30kV, frequency of Jiangsu grid drop slightly, can maintain
stable operation.
TuC06.4
Qian Zhou
Jiangsu Electric Power Research Inst.
Analysis on the Operating Characteristic of
UHVDC Hierarchical Connection Mode to AC
System
pp. 1834-1837
Jiangsu Electric Power Research Inst.
Jiangsu Electric Power Research Inst.
Research on interaction impacts on UHVDC after fault in receiving-end power grid is important for improving stability. In
order to research the running stability of the receiving end grid
under typical fault take Jinsu UHVDC project as background,
the sending grid and also the entire main grid of Jiangsu outside Jinsu UHVDC were established base on ADPSS. In accordance with the actual project DC line, filters, converter
transformer and other DC electromagnetic transient model.
The influence of typical faults on the receiving end grid such as
AC bus fault, three-phase short circuit on line and bipolar
locking were analyzed. Finally, restart procedure of bipolar
locking were studied. Simulation results shows that serious
fault may lead to DC bipolar locking, bipolar blocking or typical fault in AC system; Jiangsu power grid can restart
smoothly after bipolar blockin, but the receiving end power
grid can keep stable operation after bipolar locking.
Wanqian Sun
Nanjing Univ. of Posts and Tele.
Rong Fu
Nanjing Univ. of Posts and Tele.
Zhenkai Zhou
Nanjing Univ. of Posts and Tele.
Xiaojuan Huang
Nanjing Univ. of Posts and Tele.
Chenggen Wang
Jiangsu Electric Power Research Inst.
Ke Xu
Jiangsu Electric Power Research Inst.
Bing Xie
Jiangsu Electric Power Research Inst.
Zhaowei Li
NARI Technology Co.Ltd.
Ming Ni
NARI Technology Co.Ltd.
In this paper, the mathematical method of the MIIF (multi-infeed interaction factor) under UHVDC hierarchical connection mode is analyzed, and the correctness of the method is
verified by PSCAD simulation. In hierarchical connection
mode, it was analyzed that one inverter in a bus which has
been in the condition of commutation failure has effect on another inverter in another bus with the change of MIIF.
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D: New Energy Power Generation
and Microgrid Technology
TuD01.1
A Research on Design and Evaluation of BIPV pp.
1838-1843
QiangZeng
JingpengChen
Guangdong Grid Company
hanghai Jiao Tong University
Jianmo Ni
hanghai Jiao Tong University
Qian Ai
hanghai Jiao Tong University
ZhaoyuWang
hanghai Jiao Tong University
RuicongZhai
PingXu
Electric Power Research Institute of Guangdong Grid Company
Guangdong Grid Company of
Jiangmen Power Supply Bureau
ChengzhiMa
Guangdong Grid Company of
Jiangmen Power Supply Bureau
PengminWang
Shanghai Huali Software System
Company Limited
Building Integrated Photovoltaic (BIPV) systems are expected
to increase significantly in the forthcoming years because of its
friendliness with natural environment. This paper discusses
design and evaluation of BIPV. A novel way to calculate tilt
angle is presented to reduce the impacts of shading and maximize power output, followed by a design example to show its
effectiveness. In system evaluation, levelized cost of energy
(LCOE) method is used to evaluate the economy of designed
system and output optimized tilt angle and LCOE optimized
tilt angle are obtained. Government’s incentives are more crucial for the improvement of BIPV’s LCOE. Life-cycle emission
analysis is used to quantify environmental benefits of BIPV
systems.
TuD01.2
Research on correlation evaluation and joint
probability model of multi-wind generation
scenarios
pp. 1844-1847
TaoShi
China Electric Power Research Institute
LingzhiZhu
China Electric Power Research Institute
XiangyanWang
China Electric Power Research Institute
In this paper, in order to quantify the correlation and joint
probability character between different wind farms, the relativity analysis theory is used in the correlation evaluation of
multi- wind farms, located in different positions. And then a
method for modeling the joint probability distribution of wind
November 26-29，2015 Changsha，China
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
resource in multi-wind farms is provided, which is based on
the copula function. The availability of this method are
demonstrated by an actual case with two wind farms, located
in northwest of China .
error has obvious effect on optimized scheme of power flow
calculation, unit commitment and operation in the power system with wind power. The wind forecast error is different under the power dimension and correlative under time dimension,
so it can describe the actual wind power attributes more accurately on the basis of fitting the forecast error divided into
different groups according to the power-time attributes. The
parameters distribution like normal distribution can not describe the error in different bins accurately, but this paper
proposed non-parameter kernel density estimation (NKDE) to
fit the error data in various bins, which is also suitable for
various forecast methods. If ignoring the characteristic of
NKDE, it has poor fitting effect because of too many bins and
too few data in some bins. This paper proposed a method to
reduce the number of bins to improve the fitting effect and
reduce calculation time. Results for this case show the proposed probability density function (pdf) is more close to the
actual wind power error distribution.
TuD01.3
Comprehensive Evaluation of Renewable Energy
for Power Projects Based on CA-DEA Model
pp. 1848-1853
XiaochuanMa
North China Electric Power Univ.
BoZeng
North China Electric Power Univ.
YuxiZhang
North China Electric Power Univ.
YingziLi
North China Electric Power Univ.
ZongqiLiu
North China Electric Power Univ.
This paper presents a two-phase evaluation model called cluster analysis data envelopment analysis (CA-DEA) for renewable energy in power generation projects which combines cluster analysis and data envelopment analysis, to achieve the optimal resource exploitation sequence in the stage of planning
and the effective evaluation during the period of operation. On
the basis of a designed comprehensive evaluation index system,
the fuzzy AHP is introduced to analyze the qualitative indices,
such as the coordination level with local condition. The dominant factors can be determined by applying cluster analysis
(CA); the non-parametric DEA model is adopted for the assessment of project input-output efficiency, which makes the
production function determination easier. According to the
comprehensive values of the ratio of input to output, the effective assessment to the performance of the projects could be
implemented. Finally, a practical case is presented to verify the
effectiveness and practicability of the model.
TuD01.5
Chaotic Time Series Prediction Model of Wind
Power
pp. 1860-1863
The Fitting Method of Wind Power Forecast Error under Power-time Dimension
pp. 1854-1859
Intelligent Dispatch and Control of
Ministry of Education
XueliWan
State Grid Shandong Electric Power
Maintenance Company
LibinYang
Deyang Electric Supply Company of State Grid
HuaqianLi
Sichuan University
LanWang
Sichuan University
Wind Power Prediction Errors Model and Algorithm Based on Non-parametric Kernel
Density Estimation
pp. 1864-1868
Intelligent Dispatch and Control of
Ministry of Education
JunLiang
ZhijianYuan
TuD01.6
Intelligent Dispatch and Control of
Ministry of Education
ChengfuWang
Deyang Economic and Tech Research Inst
In order to reveal the interval laws of wind power time series,
the phase space reconstruction which is on the basis of chaotic
time series theory is used to identify the chaotic feature of wind
power time series. Considering the different effects of different
coordinate of phase points on predicted point, this paper improves the distance criterion and the evolutional trend criterion by weighting. In addition, this paper proposes an improved
local Volterra adaptive filter to predict wind power by proposing a comprehensive criterion to select the neighbor points as
the training set. The simulation of the measured data of a certain wind farm shows the proposed model is accurate and fast.
TuD01.4
ZhaoqingWang
ZhijianYuan
State Grid Qinghai Electric Power institute
Randomness and volatility are the inherent attributes of wind
power, and the present method for forecasting wind power is
not accurate enough. However, the exact description of forecast
95
GuodongLiao
Economic & Technical Research Institute
GuodongLiao
Jie Ming
Boyuan Wei
Hongji Xiang
Nan Jiang
Peng Ai
Chaohua Dai
State Grid Hunan Electric Power Corporation
Southwest Jiaotong University
Southwest Jiaotong University
Southwest Jiaotong University
Southwest Jiaotong University
Southwest Jiaotong University
Southwest Jiaotong University
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Xintao Xie
Xintao Xie
MengjiaoLi
MengjiaoLi
model proposed in this paper has higher prediction accuracy
compared to another model and has certain application value．
Economic & Technical Research Institute
State Grid Hunan Electric Power Corporation
Economic & Technical Research Institute
State Grid Hunan Electric Power Corporation
TuD01.8
For the high randomness and fluctuation of wind power, as
well as the low precision of the power prediction, the traditional prediction of wind power point is not able to describe the
uncertainty of wind power. A normal distribution is usually
used to model wind power forecast error, but it is not valid in
some special cases. In this paper, non-parametric kernel density estimation is adopted to calculate the probability density
errors of wind power prediction at different levels. According
to system reserve capacity requirements, safety and economy
of power generation dispatching, a wind power prediction interval with three spline interpolation is acquired which satisfies the certain confidence interval. The three spline interpolation is the wind power error’s distribution function. An equality constrained optimization problem was simplified into an
unconstrained optimization problem and Newton with the
characteristics of non-parametric kernel was presented. Given
a probability value at a certain precision, it’s useful to use
Newton to search for arguments. Then, the upper and lower
range are obtained. The calculation results show that the used
wind power interval forecasting method can provide wind
power prediction curve and its variation range, and is more
suitable for wind power uncertainly.
Longitudinal Moment Markov Chain Model of
Wind Power and Its Application on Ultra-short-term Prediction
pp. 1874-1878
Zhong Chen
Changsha University of Science & Technology
Dongyang Yin
Shandong University
Libin Yang
Shandong University
Communication Shandong NormalUniversity
State Grid Qing Hai Electric Power Research Inst
XueliWang
State Grid Shandong Electric Power
Maintenance Company
In this paper, a longitudinal moment Markov chain model of
wind power time series based on the longitudinal time concept
is proposed. This model emphasizes the transition characteristics related to different moments by providing a set of transition probabilities matrices. This matrices set, describing the
inherent transition information of moments, gives the necessary probabilistic conditions for optimization decision of power
systems containing wind farm. Besides of rapid calculation as
conventional Markov chain model has, the proposed model
makes the transition information more detailed and accurate.
To illustrate the effect of improvement, a wind power prediction (WPP) method on ultra-short-term horizon using the longitudinal moment Markov chain model is put forward. The
case study based on actual wind power data under multiple
time scales shows that the proposed method achieves a higher
prediction precision.
Huitong County Power Supply Co., Ltd,
TuD01.9
State Grid Hunan Electric Power Company
Qi Li
Zhihao Yun
XiaojuanYang
A new combination Model for short-term
wind power Prediction
pp. 1869-1873
Changsha University of Science & Technology
Shandong University
Jun Liang
TuD01.7
Zizhong Yin
JingwenSun
Electric Power Economic and Technical Research
Short Term Wind Speed Forecasting Using
Wavelet Transform and Grey Model Improved by
Particle Swarm Optimization
pp. 1879-1884
Institute, State Grid Bengbu Electric Power Supply Company
Short-term wind power prediction is important to the dispatch
and operation of power system. A prediction model based on
the rough set, principal component analysis (PCA) and Elman
neural network (ElmanNN) is constructed for short-term wind
speed forecasting to improve the prediction accuracy of
short-term wind power. The wind speed prediction model is
established by using ElmanNN, and PCA is used to extract the
feature of wind speed data, which optimizes the inputs of
ElmanNN. Furthermore, excitation function and the structures
of network are improved to search for the optimum solution to
function of convergence rate and prediction accuracy. To solve
large error and prediction accuracy fluctuations of the
ElmanNN model at the peak value of wind speed, the rough set
theory is proposed to compensate and correct the predicted
values to further improve the forecasted results. Finally, the
predictive value of the wind power is obtained by the power
conversion. Experiment results show that the new combination
November 26-29，2015 Changsha，China
MianGuo
Hohai University
ZhinongWei
Hohai University
HaixiangZang
Hohai University
GuoqiangSun
Hohai University
Huijie Li
Alston Power Grid Technology Center Co., Ltd
Kwok W. Cheung
GE Grid Solutions lnc.
Nowadays wind energy is one of the most important source of
renewable energy worldwide. Wind power generation is an
important form of wind energy utilization. The energy problem has become increasingly prominent, which requires to
speeding up the development of wind energy industry. However, the existing wind speed forecasting using grey model is in-
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
eration is the key to master the change law. In order to explore
the direct or indirect-cross influence of various environmental
factors on PV generations, this paper collects the continuous
generation data of Changzhou practical engineering cases and
meteorological data in the first quarter of year 2014 and 2015,
analyzes the effects of radiation, temperature, weather ty-pe,
wind indices, air quality and other factors on system generation based on mathematical regression method, deduces the
prediction formula of system generation, and verifies the prediction error. Studies have shown that various environmental
factors have different effects on PV generation, and the photovoltaic power generation forecasting model based on regression analysis has good precision.
accurate. Direct prediction of original wind speed sequence
produces large error because of the randomness of wind power.
To solve the above problems, a novel method for short term
wind speed forecasting based on grey model is proposed in this
paper. In order to reduce the error of short term wind speed
forecasting, one of the most successful approaches is particle
swarm optimization algorithm, which chooses the parameters
of grey model to avoid the man-made blindness and enhances
the efficiency and capability of forecasting. In the present paper, the wavelet decomposition and reconstruction are used to
separate the high frequency signal and the low frequency signal. To verify its efficiency, this proposed method is applied to
a wind farm’s wind speed forecasting in China. The result
confirms that the performance of the method proposed in this
paper is much more favorable in comparison with the original
methods studied.
TuD02.1
TuD01.10
Increasing Maximum Penetration of Distributed
Generation by Voltage Regulation in Smart Distribution Grid
pp. 1894-1898
Experimental Study on Biological Removal of
Malodorous Gas Containing Hydrogen Sulfide
pp. 1885-1888
Lu Bai
State Grid Shanxi Electric Power Research Inst
Shizhong Yan
Shanxi Electric Power Survey and Design Insti
TianzhengWan
State Grid Shanxi Electric Power Research Inst
Hua Yu
State Grid Shanxi Electric Power Research Inst
Zhipeng Wang
State Grid Shanxi Electric Power Research Institute
Shanshan Zhao
TuD01.11
Hui Jie
Hohai University
Ni Ying
Hohai University
Xiaohui Song
China Electric Power Research Institute,
TuD02.2
Study on the Photovoltaic Power Generation
Prediction Methods Based on Comprehensive
Regression Analysis of Environmental Factors
pp. 1889-1893
Hohai University
China Electric Power Research Institute,
With the increasing pressures on energy conservation and
emission reduction, the urgent need arises to increase the
maximum penetration of distributed generation (DG) without
violating the voltage limits. This paper proposes a
two-dimensional multi-resolution model of smart distribution
grid (SDG) to analyse dynamic changes of DG and load at first.
And then based on the model, an analytical methodology is
presented to determine and increase the maximum DG penetration without voltage violations by voltage regulation. IEEE
Comprehensive Test Feeder is used to prove the feasibility and
validity of the proposed model and method. The simulation
results show that voltage regulation is proved to be a good solution to increase the maximum penetration of DG, but a compromise must be made between higher penetrations of DG and
fewer adjustments of voltage regulation devices. This will have
major implications for the development of DG in SDG.
Biomass power generation is the next essential part of green
power generation, and in the future its proportion of the power
industry will be bigger and bigger. Concomitant with the biomass power generation is producing a large amount of mainly
hydrogen sulfide gas. Selecting hydrogen sulfide as a research
object which is the main odor pollutant, the management of
odor gas hydrogen sulfide was investigated by using the combined process Bio-Trickling reactor in this paper. Meanwhile,
diverse factors which might influence the operation of
bio-trickling reactor were inspected and the reacting mechanism of biological deodorization was analyzed as well. Technical route in this paper would provide new methods and
thinking for management of pollution composed of multicomponent gases which is represented for odor waste gas. Similarly,
research conclusions would offer basic data and reference for
further application study.
Jinrong Shen
China Electric Power Research Instit,
Xiaoli Meng
Scenario Model and Algorithm for Distribution
Network Reconfiguration with Wind Power
Generators Embedded
pp. 1899-1903
Yuqing He
Jingjing Liu
Chao Xu
Accurate mastering the changes of photovoltaic power generation system is the base to achieve scientific scheduling of power
stations. Conducting comprehensive analysis on the direct and
indirect effects of environmental factors on system power gen-
Lilin Mao
Hunan Electric Power Corporation Econl & Techl
Research Inst
Hunan Electric Power Corporation Econ & Techl
Research Inst
Hunan Electric Power Corporation Econ & Tech
Research Inst
Hunan electric power transmission
A novel scenario distribution network reconfiguration model
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Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
improve the wind power conversion efficiency. This paper establishes the mathematical models of Doubly Fed Induction
Generator, wind turbine and rotor side converter, designs the
MPPT control strategy controller and the rotor side converter
controller, and uses the double steps hill climb searching algorithm to develop the simulation model of DFIG-based wind
turbines based on MATLAB/SIMULINK platform. Simulation
results show that double steps hill climb searching algorithm is
a good method to achieve the maximum power point tracking
of DFIG-based wind turbines.
considering wind power generators (WPG) is presented in this
paper. Scenario analysis is applied to describe the influences of
random output from WPG through scenario selection and
scenario voltage in this model. A dynamic reactive power compensation strategy is put forward to satisfy the passive reactive
demand of WPG. An efficient hybrid algorithm combined
physical optimization and genetic algorithm is presented for
the scenario distribution network reconfiguration model.
Through the no-unfeasible-coding rule in the initial population
strategy, recombination strategy and eugenic strategy, individuals in the evolution always form feasible solutions. Physical optimization based on scenario voltage reduces the optimization time and the dependence of the population size. Test
results verify the efficiency of the proposed model and algorithm.
TuD02.5
Fault Diagnosis of Wind Turbine’s Converter
Based with SOM Net
pp. 1915-1918
TuD02.3
A Distributed Real Time Power Allocation Strategy for Dispersed Energy Storage Systems
pp. 1904-1909
Jun Xie
Nanjing University
Lu Wang
Nanjing University
Kaixuan Chen
Nanjing University
ChongxinHuang
Nanjing University
Yaping Li
China Electric Power Research Institute
Ke Wang
China Electric Power Research Institute
Baohui Zhang
Xi'an Jiaotong University
TuD02.6
A Method to Improve the Efficiency of Asymmetric Parallel Converters for PV Generation
pp. 1919-1923
TuD02.4
MPPT Control Strategy of DFIG-based Wind
Turbines Using Double Steps Hill Climb
Searching Algorithm
pp. 1910-1914
Junhua Yan
Tongji University
Longhua Mu
Tongji University
This paper proposes an efficiency-based current distribution
scheme to improve the overall efficiency of PV parallel converters with asymmetric circuit parameters. At the beginning,
an efficiency optimization model with explicit objective function and restrictions is built based on the analysis of common
efficiency model of DC/DC converters. The particle swarm
optimization (PSO) algorithm with inertia weights is used to
solve the efficiency optimization model, which determines the
optimal phase current of parallel converters. Furthermore, a
linear interpolation method is used to obtain continuous target
value of optimal phase current. Case study demonstrates the
validity of the proposed current distribution scheme for PV
parallel converters with asymmetric circuit parameters.
South China University of Technology
South China University of Technology
Recently DFIG-based wind turbines have become the dominant wind turbines for its mature control technology and high
stability. And maximum power point tracking control strategy
(MPPT) of DFIG-based wind turbines is very significant to
November 26-29，2015 Changsha，China
Xi'an Jiaotong University
Nowadays, most provinces of China like Xinjiang, Gansu,
Ningxia, Inner Mongolia, Zhejiang, Heilongjiang, Jiangsu,
Guangdong are constructing windfarms on a large scale. After
all these windfarms are completed, the maintenance of them is
very commercially valuable. Therefore, a fault diagnosis system of wind turbine's converter is studied in this paper on the
basis of Xinjiang's windfarm. Firstly, the structure of wind
turbine and converter are introduced, and the reasons of converter's faults are analysed in this paper. SOM net was used to
diagnose wind turbine converter’s fault and it’s effect was verified by using data. This paper combine traditional fault diagnosis technology of power electronics' device with the fault
diagnosis technology of xinjiang wind turbine's converter in a
creative way, and it can have some active effect on using wind
power largely.
This paper presents a distributed consensus strategy that regulates the power outputs of dispersed energy storage systems
(DESS) in power distribution network, which can be used to
smooth the renewable power fluctuations. The algorithm is
based on the consensus algorithm in graph theory and it satisfies both the smooth of the renewable power fluctuations and
the equity allocation among DESS. The most distinct feature of
the algorithm is that there is no “dispatch center” or “leader”
to collect the global information in real-time power allocation
process, each DESS obtains the global information and allocates its power outputs and realizes the target of smoothing the
global renewable power fluctuations according to the local
information interaction among DESS. Simulation on the IEEE
34-bus distribution system demonstrates the effectiveness of
the proposed algorithm.
Xiaoyan Du
Huajie Yin
Xiaobo Zhang
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
more, the paper also investigates the influence on the power
loss considering different positions the photovoltaic connected
along the low-voltage feeder. From the perspective of decreasing the three-phase unbalance factor, some advice for the photovoltaic connected to the distribution networks is proposed at
last. The simulation results show that the proposed advice can
effectively reduce the losses caused by the three-phase unbalance. It also provides effective guidance and recommendations
for the electricity company to carry out loss reduction work
and to deal with large-scale single-phase photovoltaic connection in the future.
TuD02.7
Fault Ride-Through Capability Enhancement by
Adapative Voltage Support Control for Inverter
Interfaced Distributed Generation
pp. 1924-1928
Dehui Zeng
South China University of Technology
Jingmei Guo
South China University of Technology
Maosheng Ding
Ningxia Electric Power Corporation State
TuD02.9
Grid Corporation of China
Duo Geng
Ningxia Electric Power Corporation State
Coordinated Optimal Operation of Hybrid Energy
Storage in Power System Accommodated High
Penetration of Wind Power
pp. 1935-1941
Grid Corporation of China
In order to meet the grid code of distributed generation and
avoid intolerable over-voltage of dc-side on the occurrence of
grid faults at the same time, an adaptive voltage support control strategy for low voltage ride-through (LVRT) of inverter
interfaced distribution generation (IIDG) is proposed. Firstly,
according to the request of German grid code, the basic control
strategy and the fault current characteristic of IIDG are studied. Then, based on analyzing the effect of reactive power supplied by IIDG to the point of common coupling (PCC) voltage,
this paper proposed an adaptive voltage support control strategy to enhance the fault ride-through capability of IIDG. Finally, simulation results demonstrate the proposed control
strategy has advantage of improving to PCC voltage support
capability and helping to ensure the safety of the IIDG equipment.
Guangxi University
Guangxi University
Tangshan Cui
Guangxi University
Wanxia Bi
Guangxi University
Huazhong Univ of Science and Tech
State Key Laboratory
Suhua Lou
Huazhong Univ of Science and Tech
Xiangcheng Zhang
Qinghai Province Key Laboratory
Xu Tia
Qinghai Province Electric Power Company
Zuoxia Bai
Qinghai Province Electric Power Company
The variability and nondispatchable nature of wind power
presents sustainable challenges for power system’s steady operation and security. In order to accommodate high penetration of wind power and increase the utilization rate of renewable resources, a model of hybrid energy storage system consisting of battery energy storage system and pumped storage
power station is proposed in this paper, and a coordinated optimal operation method in the power system is presented.
Based on the restriction of upper wind power fluctuation rate
limit, a determination method of grid-connected wind farm
power output is presented, which can improve the scheduling
performance of wind power. The power difference between the
original wind farm power output and grid-connected wind
farm power output is mitigated by BESS due to its quick response capacity. Pumped storage power station is used for
peak regulation in power system. The proposed model and
operation method are verified on a modified RTS-96 system,
the results are presented to prove the feasibility and effectiveness of the proposed model and method.
Power Loss Analysis for Low-voltage Distribution
Networks with Single-Phase Connected Photovoltaic Generation
pp. 1929-1934
Lei Ye
State Key Laboratory
Tianmeng Yang,
Suhua Lou
TuD02.8
Biyun Chen
Tianmeng Yang
Currently, the photovoltaic generation has been paid highly
attention to and has obtained policy encouragement. With the
increasing popularity of single-phase photovoltaic in
low-voltage distribution networks, it may deteriorate the overall grid performance including power flows, losses and voltage
profiles. On the other side, single-phase photovoltaic connected
to the distribution networks will have some influence on the
balance of three-phase that may bring additional losses under
a three-phase unbalanced situation. In this paper, the concept
of three-phase load current unbalance factor is introduced and
additional losses in circuits and transformers induced by the
three-phase unbalance are firstly analyzed. Secondly, the variation characteristics of the power loss and the three-phase unbalance are studied when single-phase photovoltaic is connected to different phases and different capacities. Further-
TuD02.10
Multi-Types of Distributed Generators Planning
Based on Free Search Algorithm
pp. 1942-1947
Jin Wang
Wei Dai
Yuxuan Zhou
99
Changsha Univof Scie & Tech
Changsha Univof Scie & Tech
Changsha Univof Scie & Tech
November 26-29，2015
Changsha，China
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
Distributed generators (DG) brings about great environmental
benefits which makes it worth researching. In order to optimize the grid-connected positions and capacities of various
types of DG, a multi-objective model is established. The total
generation cost of DG, the network loss and static voltage stability indices are synthetized in the model. Additionally, a kind
of improved multi-objective free search (IMOFS) optimization
method is proposed. This algorithm adaptively adjusts searching radius and step to improve searching efficiency. According
to the period of evolution, the previous searching radius and
step do not change much in searching for the overall situation,
while they change relatively greatly in the later stage in local
exploration by the algorithm. At the same time, in order to
make the distribution of Pareto front more even, dynamic
adaptive mesh strategy is adopted to maintain the
non-dominated set, thus good candidate schemes are provided
for terminal decision.
TuD02.12
Study
on
Control
Characteristic
of
Grid-connected Solar Photovoltaic Plant Based
on Simulation
pp. 1954-1958
China Electric Power Research Institute
China Electric Power Research Institute
Dajun Jiang
China Electric Power Research Institute
Dawei Zhao
China Electric Power Research Institute
Yanzhang Liu
China Electric Power Research Institute
China Electric Power Research Insti
China Electric Power Research Insti
Dongfang Wang
State Grid Qinghai Electric PowerCompany
Haining Zhang
State Grid Qinghai Electric PowerCompany
TuD02.13
Accurate wind turbine model is the basis of studying its dynamic physical process and performance characteristics. In
order to resolve the difficulties in modeling direct-drive permanent magnet wind turbine (DD-PMWT) because of the absence of permanent magnet synchronous generator (PMSG)
model in some existing power system analysis software, the
method to interconversion between electrical excitation synchronous generator (EESG) and PMSG was presented as well
as the parameter conversion formulas and procedure were
provided on the basis of their mathematical model and equivalent circuit in this paper. In additon, the model of DD-PMWT
was built in DIgSILENT PowerFactory by means of replacing
PMSG with EESG. Finally, based on the typical test system
provided by Western Electricity Coordinating Council
(WECC), the dynamic characteristics of DD-PMWT were analyzed. The simulation results verified the validity of the proposed method and the rationality of the established
DD-PMWT model.
November 26-29，2015 Changsha，China
Lei Zhang
Along with the advancement of renewable energy development
strategy, photovoltaic (PV) power technology has gained rapid
progress in recent years. Due to the rapid growth of PV power
penetration in power system, the research with PV power grid
integration are drawing more and more attention, such as low
voltage ride through (LVRT), automatic voltage control (AVC),
voltage stability and so on. This paper investigates on voltage
and reactive power control characteristic of grid-connected
solar PV plant based on simulation. The voltage and reactive
power control strategy uses the grid-connected inverters and
static VAR compensation (SVC) device as flexible and controllable source of reactive power to regulate the voltage and reactive power of large-scale PV power plants. The PV inverters
and SVC both have a variety of control mode generally, such
as constant voltage control mode, constant reactive power control mode, constant power factor (PF) control mode and so on.
The coordination control characteristic between PV inverter
and SVC is analyzed in this paper. Through in-depth study of
the characteristics of different combinations of control modes,
the operating characteristics of PV power plants are summarized. The research results of this paper are helpful to the development of AVC system.
Modeling and Implementation of Direct-drive
Permanent Magnet Wind Turbine Based on
Generator Parameter Conversion
pp. 1948-1953
Dongping Hu
China Electric Power Research Insti
Dawei Zhao
TuD02.11
Lei Zhang
Yanzhang Liu
The Impact of Dynamic Behaviors of Distributed
Grid-connected Photovoltaic System on Distribution Network Transient Voltage Stability
pp. 1959-1964
Liuhan Huang
Shandong University
Wen Zhang
Shandong University
Hao Yang
Shandong University
Due to the increasing capacity of grid-connected photovoltaic
systems in distribution networks, its impact on the voltage
security can’t be ignored. In this paper, based on the voltage
stability criterion of maximum transmission power, and considering induction motor voltage response characteristic, the
impact of dynamic behaviors of grid-connected photovoltaic
systems on transient voltage stability is investigated. Three
scenarios have been analyzed, respectively corresponding to
three kinds of photovoltaic system’s dynamic behaviors: stopping operation after voltage sags, low-voltage ride-through
capability and dynamic voltage support. In addition, P-V curve
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
is applied to do theoretical interpretation for the simulation
results in the revised IEEE 33-bus distribution network, and it
is testified that grid-connected photovoltaic systems equipped
with low-voltage ride-through capability can remarkably improve distribution network transient voltage stability, and the
effectiveness would be more prominent with the dynamic voltage support of photovoltaic systems.
taking the integrated optimal of operating cost, voltage deviation and power loss as the target and adopting multi-state
model to build a multi-objective model based on chance constrained programming. An adaptive reactive power control
strategy is employed to solve the voltage regulation problem of
grid-connected nodes. Moreover, non-dominated sorting genetic algorithm II (NSGA-II) based on elitist is proposed to
solve multi-objective model and technique for order preference
by similarity to an ideal solution (TOPSIS) based on entropy is
adopted to choose the optimal solution from Pareto solution set.
Finally, the simulation results on IEEE 33-bus distribution
system demonstrate the effectiveness of the proposed approach.
TuD02.14
Harmonic
Current
Suppression
of
Grid-connected PV Power Plant LCL Filter Based
on PR Control Strategy
pp. 1965-1969
Chao Xiong
TuD02.16
Shenyang Univ of Tech
Yun Teng
Shenyang Univ of Tech
Chunlai Li
Shenyang Univ of Tech
MPPT Control for Photovoltaic System Based on
T-S Fuzzy Reasoning
pp. 1976-1980
Qinghai Electric Power Research Inst
Zhongjie Zhang
State Grid Tongliao Power Supply Company
Xin Yu
State Grid Dandong Power Supply Company
L.L.WANG
North China Electric Power Univ
The output characteristics of the photovoltaic cell are a nonlinear and easily affected by external environment. The maximum power point tracking (MPPT) control is an effective
method to improve the conversion efficiency of the photovoltaic system. In order to solve the problems of conventional fuzzy
control algorithm, a new control strategy based on T-S fuzzy
reasoning is proposed. This algorithm can avoid the oscillation
near the maximum power point and reduce the energy loss
with good dynamic and static performance. The model of the
photovoltaic system is established and simulated by
Matlab/Simulink. The simulation results show the effectiveness
of the proposed control algorithm.
The repetitive control technique based on the internal model
principle, can achieve low steady-state tracking error and total
harmonic distortion in AC systems, so it is widely adopted in
the inverter systems. The new PR current control strategy is
developed and implemented to a grid-connected three-phase
inverter with LC filter. The controller resulted in a low current
total harmonics distortion (THD) of 3% to meet the grid requirement. Proportion-integral values above which can
achieved output controller and proportion resonant controller
are adopted to control the power adjustment and zero error
control of harmonic restrain. The result of the simulation
shows that the improved inverter control system can effectively
control the grid current waveform which tends to sine wave.
The detail design of the proposed controller is presented.
TuD02.17
Method for Wind Farm Cluster Active Power Optimal Dispatch under Restricted Output Condition
pp. 1981-1986
TuD02.15
Research of Optimal Hosting Capacity of Small
Hydropower Considering Adaptive Reactive
Power Control
pp. 1970-1975
Di Li
State Grid Henan Economic Research Inst
Shiqian Wang
State Grid Henan Economic Research Inst
Wang Lei
State Grid Henan Economic Research Inst
Nannan Xing
North China Electric Power Univ
Chunzheng Tian
State Grid Henan Economic Research Inst
Zongqi Liu
North China Electric Power Univ
Hongqi Yang
State Grid Henan Economic Research Inst
Pengcheng Xu
North China Electric Power Univ
Guo Xu
State Grid Nanyang Power Supply Company
Daogui Shi
North China Electric Power Univ
Due to the inconsistent development of power grid and wind
power farm, as well as insufficient power transmission capability, wind-abandon problem is becoming increasingly serious
in China, and no effective solution can be found in a short time.
With consideration of large scale wind farm construction in
China, a method is proposed in this paper for wind farm cluster active power optimal dispatch under output restriction
condition, which is based on the ultra-short-term wind power
In order to promote the coordinated development of runoff
small hydropower and the regional distribution network, this
paper introduces a method for calculating the optimal hosting
capacity of runoff small hydropower considering adaptive reactive power control. For the purpose of improve the security
and economy of the operation of the distribution network,
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
forecasting. In this method, the active power maximization and
the line loss minimization are assumed as the objective functions on the condition of output restriction, with power system
security, output power of wind farm, frequent turn-on and
turn-off of wind turbines, and the low forecasted power as the
function constrains. In addition, the active power loss and
short term active power forecasting error are also considered.
A case study of a wind farm cluster located in the north-west of
China has verified the effectiveness and feasibility of this
method.
the decoupling between the output power and the frequency.
Moreover, DFIGs also lack power reserve margin because of
the maximum power point tracking (MPPT) operation. In this
paper, a virtual inertial control strategy of the DFIG based
wind turbines called supplementary control loop for inertial
response is investigated. When the system frequency is changing severely, the output power of DFIG should respond to it
rapidly through the virtual inertial controller at the same time.
The rotor speeds of wind turbines can also be adjusted into this
procedure. The inertial control methods proposed in this paper
can supply controllable virtual inertia of DFIGs to the power
system so that the system frequency stability can be strengthened through inertial control of wind turbines on the basis of
damping torque analysis.
TuD02.18
Dynamic Power Flow Calculation Method of
Power System with Wind Power
pp. 1987-1991
TuD02.20
Ruohan Wang
Shandong University
Hengxu Zhang
Shandong University
Analysis of Distributed Generation Effect on
System Losses in Distribution Network
pp. 1998-2002
Changgang Li
Shandong University
Yifei Guo
Shandong Univ
Houlei Gao
Shandong Univ
Jian Wang
Shandong Univ
Changhui Ma
Shandong Electric Research Inst
High penetration of renewable energy nowadays makes it necessary to take wind power plants and solar power plants into
consideration when calculating dynamic power flow. The paper
mainly focuses on the approach to deal with wind turbine in
power flow calculation and the power-frequency characteristics of it after attaching it to power system. Firstly, the concept and major steps of dynamic power flow calculation are
illustrated. The whole procedure is programmed in Fortran
language and ready for case study. By ignoring some negligible variables, the simplified model of wind turbine which considers it as PQ bus is put forward. This model brings convenience to dynamic power flow calculation with wind power and
its rationality can be guaranteed to a certain degree. With this
model, the power-frequency relationship of wind turbine is
obtained through mathematical deduction and the complex
static frequency modulation coefficient of wind farm is calculated in order to execute dynamic power flow calculation. In a
specific case, IEEE 30-bus system is modified to be used to test
the presented algorithm.
Zhigang Wu
State Grid Shandong Electrical Power Comp
Chunpeng Han
State Grid Shandong Electrical Power Comp
Distributed generation (DG) connected to the distribution
network changes the network power flows, voltage profiles and
losses. In this paper ,the effects of DG on distribution network
active losses are studied in three factors including the DG penetration, location and dispersion levels. The loss sensitivity
factor (LSF) is adopted to analyze the effect of location on active losses. In multi-DG cases, a new approach is presented to
analyze the effects caused by different DG dispersion levels. It
is the combination of enumeration method and Monte-Carlo
method. And in order to give a quantitative conclusion, plenty
of simulations are tested on the IEEE 33-bus test system. The
simulation results provide suggestions and references for DG
optimization allocation.
TuD02.21
Probabilistic Load Flow Analysis Considering the
Correlation for Microgrid with Wind and Photovoltaic System
pp. 2003-2008
TuD02.19
Damping Torque Analysis of Virtual Inertia Control for DFIG-Based Wind Turbines
pp. 1992-1997
C. Lv
Queen’s University
Shanye Tian
Shandong University
T. Littler
Queen’s University
Hui Wang
Shandong University
W. Du
North China Electric Power Univ
Xiaohan Xie
The increasing penetration of large-scale wind generation in
power systems will challenge the power system inertia due to
the reason that the converter based variable speed wind turbines have no contribution to the system inertia. Traditionally,
a doubly fed induction generator (DFIG)-based wind power
plant naturally does not provide frequency response because of
November 26-29，2015 Changsha，China
Shandong University
With the distributed energy system widely used, quite a few
microsources have been connected to the microgrid recently.
Due to the randomness, uncertainty and correlation of microsources, the models of typical power flow calculation are
not suitable for the microgrid. A probabilistic load flow analy-
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sis is proposed based on third-order polynomial normal transformation(TPNT) combining three-point estimate method in
this paper. And the probabilistic models of microsources, such
as wind energy system, PV/wind hybrid system, are established
according to the control characteristics and various random
factors. The correlation of input random variables in the same
area is also taken into consideration. In order to deal with input random variables, the TPNT is used to transform correlated non-normal random variables into uncorrelated normal
random variables. Then the independent input variables can
be estimated by three-point estimate method and calculated by
deterministic power flow algorithm. The proposed method is
tested in a typical microgrid system containing multi-type microsources. By comparing three different cases, the simulation
results show that the proposed method is generic, effective and
correct. Besides, the microgrid system consisting of multi-type
microsources can obtain the optimal performance characteristics.
with DC series-parallel collection systems. Due to wake effect
considerations, the power generated among the series connected wind turbines does not remain the same and the series
connection causes the output voltages of the turbines to be
dis-tributed in proportion to their power output. Power curtailment is required in order to prevent the turbines being
subjected to over-voltage and under-voltage conditions. In this
paper, a voltage adjustment procedure is proposed to eliminate
over-voltage and under-voltage of wind turbines. Based on the
voltage adjustment procedure and the power generation model
of wind turbines, the energy curtailment of a wind farm is analyzed with the consideration of wake effect due to series connection. A case study on several DC series-parallel collection
configurations is presented to analyze the energy curtailment
of wind farms using the voltage adjustment procedure.
TuD02.22
A Novel Photovoltaic MPPT Controller Based on
Fuzzy Sliding
pp. 2009-2013
Fu Shen
Hongyu Li
Peng Xue
Weiguang Sun
Youjun Ren
Changqing Feng
TuD02.24
Calculation Method and Analysis of Power Flow
for Distribution Network With Distributed Generation
pp. 2020-2024
Hohai Univ
Hohai Univ
Hohai Univ
Hohai Univ
Hohai Univ
Hohai Univ
With different load and weather conditions, the output characteristics of photovoltaic (PV) cells are various. There is no
Chao Cheng
Shandong University
Houlei Gao
Shandong University
Yanqiu An
Shandong University
Xueqi Cheng
precise mathematical model of PV cells. To make full use of PV
cells, the maximum power point tracking (MPPT) is a necessary unit in PV system. This paper proposes a novel MPPT
controller based on the combination of fuzzy control method
and sliding control method. Compared only with fuzzy controller and sliding controller, the proposed controller has more
advantages, such as fast response speed, strong anti-interference, strong robustness, and a higher stability, etc.
The advantages of the proposed controller have been verified
Weifang Power Supply Company
State Grid Shandong Electrical Power Company
Jingjing Yang
Weifang Power Supply Company
State Grid Shandong Electrical Power Company
A simplified power flow calculation method for distribution
network with distributed generation is proposed in this paper.
Based on loop analysis method, this proposed calculation
method can theoretically transform the complex power flow
equations into linear algebraic equations. In addition, node
voltages of PV-type and PQ(V)-type distributed generation are
calculated by calculating and correcting their reactive power
generated by them, and finally branch loss is compensated to
by simulation in the Matlab.
TuD02.23
make the calculation method more accurate. Case study results
show that this method demonstrates shorter computing time
and good accuracy,which can meet the engineering demand of
fast power flow analysis and real-time scheduling. Simultaneously, different node types of distributed generation are inserted in different positions of distribution network and their
voltage profiles expose the effect of locations and node types of
distributed generation on power of distribution network.
Energy Curtailment Analysis of Offshore Wind
Farms with DC Series-parallel Collection Systems
pp. 2014-2019
Jingli Guo
Xi’an Jiaotong University
Xiuli Wang
Xi’an Jiaotong University
Zece Zhang
Xi’an Jiaotong University
Hui Li
Beijing Information Scie & Tech Univ
Padmavathi Lakshmanan
Cardiff University
Jun Liang
Cardiff University
Voltage balancing among the series connected wind turbines is
one of the main technical challenges of offshore wind farms
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TuD02.25
TuD02.27
Research on the LVRT of DFIG’s Wind Power
Generation with Experimental Demonstration
System
pp. 2025-2030
Static Security Risk Evaluation Of The Power
System With Wind Speed Correlation
pp. 2035-2040
Jun Zhuan
China Electric Power Research Institute
Liangzhong Yao
China Electric Power Research Institute
Bo Yang
China Electric Power Research Institute
Yuanzhi Cao
China Electric Power Research Institute
Hao Luo
Li Zhang
Junyong Liu
Sichuan University
Sichuan University
Because of the close geographic location of wind farms in the
same power grid, the correlation of their wind speeds and the
correlation of the generated wind power are obvious. This
study proposes a novel method which provides the static security risk evaluation of the power system with wind speed correlation. In this study, Ranked Set Sampling Monte Carlo simulation (RSMCS) which is based on the Nataf transformation
and Ranked Set Sampling is involved for the investigation of
the impacts of wind speed correlation on probabilistic load
flow. The proposed method provides a low computation intensive mechanism to generate a high accurate solution with a
relative easy implementation. The proposed method is validated with a modified IEEE-30 bus system which consists of four
wind farms. The static security risk of current operating state
with wind speed correlation is also analyzed in validation
work.
Nanjing Institute of Technology
This paper introduces the verification experiment on the LVRT
capability of wind power generation system in laboratory environment. A new LVRT system is designed in which contains
chopper and crowbar subsystem, by adopting the IGBTbased
fast switches instead of half-controlled thyristor, to realize the
wind power generation system ride through when voltage dip
happens. Based on the DSP & CPLD control system platform,
a novel control strategy is proposed to achieve the fast detection of voltage dip, efficient separation of positive and negative
voltage component, soft excitation of DFIG’s rotor. A 30kW
prototype DFIG system is built to verify the topology design
and corresponding control strategy of LVRT system, for
demonstration of realization and stability.
TuD02.28
The Impact of Distributed Generation and Its
Parallel Operation on Distribution Power Grid
pp. 2041-2045
TuD02.26
Research Status of Electricity-stealing Identification Technology for Distributed PV
pp. 2031-2034
Xiaodong Yuan Jiangsu Electric Power Company Research Inst.
Kai Zhang
Qinghuangdao Power Supply Company
Kexue Liu
Qinghuangdao Power Supply Company
Naipeng Yao
Qinghuangdao Power Supply Company
Yuhong Jia
Qinghuangdao Power Supply Company
Wenjun Li
Qinghuangdao Power Supply Company
Lihan Qin
Qinghuangdao Power Supply Company
Mingming Shi Jiangsu Electric Power Company Research Inst.
Zhengyang Sun
The trend of distributed power application is more and more
obvious Aiming at the problem of the lack of effective argument and the corresponding technical analysis in access system.
Focus on all kinds of distributed power supply access after the
results of the influence of the power grid operation. First of all,
from the operation mode and the way of interface for distributed power supply is analyzed, so that the classification to
study the effect of different results is easy. Then, analyse the
connection way of the distributed power grid, build a typical
distribution network model, as the basis of analysis of the distributed power access. Finally, by the theoretical calculation of
the access model, analyse the effect on the steady state characteristics and power quality, thus providing theoretical basis for
distribution network planning technology principle of modified.
Nanjing University of Science and Tech.
With the development of photovoltaic (PV) industry, some
methods of defrauding PV subsidies appeared because of the
way it generates power and the government subsidy policy.
These behaviors of defrauding PV subsidies are called electricity stealing of PV. This paper summarizes the research status of
the traditional anti-electricity stealing technology and electricity stealing of PV. Four typical methods of photovoltaic electricity stealing are introduced in principle and analyzed on
economic costs from aspects of cost of electricity stealing,
quantity of electricity stealing, earning of electricity stealing
and time of recovering cost. Finally, on the basis of related
research, several ideas to distinguish electricity stealing of PV
are proposed in this paper.
November 26-29，2015 Changsha，China
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TuD02.29
TuD02.31
The Comprehensive Evaluation of Impact of Distributed PV on Distribution Network
pp. 2046-2050
A Joint Probabilistic Analytical Model with Consideration of Wind Power and Load Uncertainties
Xinghua Dong
Yunhui Gao
Tianshun Ma
Jinlong Liu
Rongsheng Xia
Yichen Huang
Qinhuangdao power supply Comp.
Qinhuangdao power supply Comp.
Qinhuangdao power supply Comp.
Qinhuangdao power supply Comp.
Qinhuangdao power supply Comp.
Jibei Economic and Tech. Inst. Beijing
pp. 2056-2062
This paper starts with the impacts of distributed PV on distribution network in power quality, supply quality, network losses and security, establishes the comprehensive evaluation model. According to different indicators data, deal with the
high-priority indicators, low-priority indicators and neutral
indicators. Then, analyzing the weight factor of different indicators by using the combination of analytic hierarchy process(AHP) and entropy method. At last, take a distribution
network of a certain area for example, testing the feasibility
and practicability of the method.
pp. 2051-2055
Tsinghua University
Yajie Liu
Tsinghua University
Jinqing Luo
Tsinghua University
China Electric Power Research Inst.Beijing
Center for Power Grid Technology Jiangsu
Electric Power Company Research Institute Nanjing
Dan Liu
TuD02.32
Center for Power Grid Technology Jiangsu
Comprehensive Evaluation of Impacts of Distributed Generation on Voltage and Line Loss in
Distribution Network
Electric Power Company Research Institute Nanjing
Xiaodong Yuan
Center for Power Grid Technology Jiangsu
Electric Power Company Research Institute Nanjing
Ping Ge
Libao Shi
A joint probabilistic analytical model for modeling wind farm
power output and load demand considering uncertainties is
proposed in this paper. Compared with traditional numerical
solutions, the proposed model can improve computational efficiency remarkably while keeping the accuracy. Firstly, based
on a series of typical wind speed distributions whilst considering the wake effect of wind farm, the probabilistic analytical
models of wind farm power output via introducing the concept
of impulse function in the signal system are proposed. In order
to better reflect the effects of wind power and load uncertainties simultaneously, in accordance with the convolution method
described in probability theory and combined with the normal
probability density function (PDF) of load, a joint probabilistic
analytical model for describing the uncertainties of wind farm
power output and load is deduced. Finally, the comparisons
with numerical simulation method are conducted to demonstrate the effectiveness and validity of the proposed model.
Solutions for Peak Regulation of Jiangsu Power
Grid Incorporated with Large-scale Renewable
Power and Its Comparison with Germany
Yi Liu
Tsinghua University
Liangzhong Yao
TuD02.30
Qiang Li
Ren Wang
pp. 2063-2067
Nanjing College of Information Technology
Jiangsu Yangzhou Power Supply Company
Up to June 2015, the total wind and PV capacity of Jiangsu has
amounted to 6600 megawatts, which is expected to increase to
20000 megawatts in 2020. Due to the intermittency and randomness of renewable power, the reserve capacity and regulation ability of conventional generator appear to be insuffic-ient
for Jiangsu power grid with the increasing penetration level of
renewable power. For the purpose of seeking for the appropri-ate solutions for peak regulation, methods for enhancing
the regulation ability of Jiangsu power grid including inter-province tie-line control, constructing rapid regulation
power sources, exploiting the existing conventional generators
potential and optimizing unit commitment by wind power
forecast are investi-gated. Meanwhile, the comparison of renewable power grid-integration of Jiangsu and Germany are
analyzed, and some experiences in the peak regulation of
Germany are presented, which may be useful for Jiangsu
power grid.
Jian Wang
Shandong University
Houlei Gao
Shandong University
Guibin Zou
Shandong University
Zhigang Wu
State Grid Shandong Electrical Power Company
With the high penetration of distributed generation (DG), the
power quality, protection and control of the distribution networks will be affected. This paper mainly studies the impacts
of DG on both voltage and line loss. To quantitatively evaluate
the impacts, a set of quantification indices are adopted. To
take comprehensive evaluation of the impacts, a principal
component analysis (PCA) method is proposed in this paper.
Considering different capacities and different locations, the
evaluation indices are calculated based on IEEE 33-bus test
system. The results are presented and analyzed to illustrate the
usefulness of proposed method and indices.
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
tinuous quantity with the double-optimization strategy; Introduced the fuzzy satisfaction-maximizing method to reaching a
decision for Pareto solution and also nested into each dynamic
solution; Through simulation for 10 units of wind power, the
result show that this method is an effective way to optimize the
Multi-objective unit commitment modeling in wind power
integrated system with Mixed-integer variable.
TuD02.33
Credible Capacity of Wind/PV Hybrid System
Research Based on Hybrid Algorithm
pp. 2068-2073
Pei Zhang
Shandong University
Weixing Zhang
Shandong University
Chunjuan Jia
Shandong University
Xiao Yang
Shandong University
Fengjun Yi
Shandong University
TuD02.35
Stochastic Optimal Power Flow with Wind Generator Based on Stochastic Response Surface
Method (SRSM) and Interior Point Methods
pp. 2079-2083
In view of the unstable reliability of the power grid due to the
integration of various intermittent power sources with power
grid, this paper intends to discuss the credible capacity of the
wind/PV hybrid system to research the complementarity of the
wind power and PV power. Based on sequential Monte Carlo
simulation, this paper develops the reliability evaluation models of wind and PV power and analyzes the complementarity
and probability of output power of them. To tackle the misconver-gence with a high calculation accuracy in the secant
method and the slow iterative speed in the dichotomy, this paper presents a hybrid algorithm to calculate the credible capacity. By combin-ing the secant method with fast iterative
speed and the dichoto-my with no misconvergence, this algorithm avoids the miscon-vergence when the fast iterative speed
and realizes the high cal-culation accuracy. Modified IEEE
RTS-79 system is utilized to verify the validity of the proposed
hybrid algorithm. The result shows that the hybrid algorithm
has a fast iterative speed and has no misconvergence. Moreover,
this paper analyzes the ef-fects of the proportional ratio between installed capacity of wind power generators and that of
PV arrays, the penetration of the renewable energy generations and the reliability level of the original system without
renewable energy on the credible capac-ity of hybrid system.
Ying Tan
Rui Ma
Changsha University of Science and Technology
Changsha University of Science and Technology
In order to describe the randomness of the wind speed, analyze
its influence to the optimal power flow with wind power generator，and reduce simulation time, this paper proposes a calculation method for stochastic optimal power flow with wind
generator based on stochastic response surface method (SRSM)
and interior point methods. The stochastic response surface
method is applied to transform the problem of probability
evaluations of the output power to the deterministic problem
and shorten calculation time. The interior point method is used
to deal with the randomness of wind speed and solve the deterministic problem stochastic optimal power flow with wind
generator. Compared with the Monte Carlo method on IEEE
14-bus systems, the stochastic response surface method requires smaller amount of computation and achieves higher
accuracy. The results also indicate that the proposed compound method are more practical and effective in reducing
simulation time.
TuD02.36
TuD02.34
Research on Discrete PR Controller with LCL Filter Based on DRNN for Photovoltaic
Grid-Connected Inverter
pp. 2084-2088
Multi-objective Dynamic Unit Commitment
Optimization for Energy-saving and Emission
Reduction with Wind Power
pp. 2074-2078
Jin Wang
Yuxuan Zhou
Zhenxiong Zhou
Shuo Shi
Changsha University of Science&Technology
Changsha University of Science & Technology
The single-phase photovoltaic grid-connected inverter with
LCL filter is studied as the research object in this paper. Based
on the nonlinear and time-varying characteristics of photovoltaic grid-connected system, the double closed-loop control
strategy of PR control is presented. For the PR controller of
fixed parameters is unable to adapt to changes in power network parameters, and the system control performance cannot
be optimized. A PR control method based on DRNN of dynamic self-tuning is presented and its control algorithm is given.
DRNN is based on the two-step RPE algorithm, which has a
faster convergence rate than the BP algorithm using the
first-order gradient algorithm. The simulation results prove
that this control strategy has a good quality of the output cur-
As a clean energy, wind power is massively utilized in net recent years, which significantly reduced the pollution emission
created from unit. This article referred to the concept of energy-saving and emission reducing; built a multiple objective
function with represent of the emission of CO2& SO2,the
coal-fired from units and the lowest unit fees of commitment;
Proposed a algorithm to improving NSGA-Ⅱ(Non-dominated
Sorting Genetic Algorithm-II) for the dynamic characteristics,
consider of some constraint conditions such as the shortest
operation and fault time and climbing etc.; Optimized and
commitment discrete magnitude and Load distribution con-
November 26-29，2015 Changsha，China
Beihua University
Beihua University
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rent and fast performance in dynamic response, the resonance
of grid current is effectively avoided and high in-grid power
factor is achieved.
isolated microgrid in north China is used for verification. The
results indicate that the above proposed energy scheduling
strategy could play the complementary advantages of two
storage components more adequately. And comparisons between QPSO and traditional particle swarm optimization
(PSO) are made by analyzing the configuration results, which
proves that using QPSO algorithm can find the optimal solution more quickly and save the daily cost of HESS.
TuD03.1
A
Novel
Control Strategy of
Super
Capacitor-Battery Energy Storage System
pp. 2089-2093
Yuqiang Ou
Jiangmen Power Supply Company
Jianzhong Wen
Jiangmen Power Supply Company
Liguo Wang
Jiangmen Power Supply Company
TuD03.3
Zhiwen Yu
Shanghai Jiaotong University
Economic Analysis of Applying the Used EV Battery to Commercial Electricity Customer
pp. 2100-2103
Jiantao Huang
Shanghai Jiaotong University
Kuan Zheng
State Grid Energy Research Institute
Zhanghua Zheng
State Grid Energy Research Institute
Qian Ai
Liukai Fen
Shanghai Jiaotong University
Shanghai Holley Software System
Storages are usually used to absorb the fluctuation power
produced by distributed generators such as wind turbine (WT)
and photovoltaic (PV). The SC-battery hybrid energy storage
system (HESS) has attracted more and more attention because
of the advantages of high power density and high energy density. In this paper, a typical ac power grid is presented which
consists of WT, PV, super capacitor (SC) and battery. A novel
cooperative control strategy for HESS is proposed to control
the SC to rapidly absorb or release power and the battery to
exchange slowly fluctuating power. It is proved that the proposed control strategy can prevent the SC from saturation and
low voltage, which can make full use of SC and battery. Finally,
a wind-solar power example is proposed to verify the effectiveness and correctness of the control strategy. The results
show that the control strategy can make SC and battery run
normally and restrain the fluctuation power.
State Grid Beijing Electric Power Company
Jie Ren
State Grid Beijing Electric Power Company
Electric vehicles have indeed contributed a lot to the energy
savings and environment protections, while it leaves a worldwide problem that is how to recycle its core component- the
battery. A specific economic analysis of applying the used EV
battery to the commercial electricity customers is carried out
based on actual data of the real-time load curves and the electricity prices collected from the State Grid Beijing Electric
Power Company. Obtained results show that the secondary
utilization of the EV battery as a storage technology is justified
in load shifting application and its cost effectiveness is decided
mainly by the volatility of electricity prices. Furthermore is
reasonable for commercial application and the benefits can be
improved with capital cost being lower and lifetime being
longer. In addition, its benefits include not only the monetary
savings from the load shifting, but also the improvement of
network congestion by reducing the peak demand. Subsidy to
storage technology market is also reasonable if savings from
network congestion improvement is significant.
TuD03.2
Optimal Capacity Configuration of Hybrid Energy
Storage for an Isolated Microgrid Based on QPSO
Algorithm
pp. 2094-2099
Xiaohan Xie
Hui Wang
Shanye Tian
Yaodong Liu
Haiyun Jiang
TuD03.4
A Novel Energy Storage for PFC by EV Motor/Generator
pp. 2104-2107
Shandong University
Shandong University
Shandong University
Shandong Jianzhu University
The capacity configuration of energy storage de-vices not only
affects the power supply reliability of an isolated microgrid,
but also directly relates to its economic operation. In allusion
to an isolated microgrid which includes typical loads, a hybrid
energy storage system (HESS) and renewable energy resources,
a new quantum-behaved particle swarm optimization (QPSO)
is proposed in this paper to optimize the capacity of the HESS.
A rational energy scheduling strategy is also put forward. Additionally, a mathematical model is established which the lowest daily cost of HESS is taken as the objective. A case of an
Hui Wang
Shandong University
Chenghui Zhang
Shandong University
Wenlong Qi
University of Hong Kong
Khai D. T. Ngo
Virginia Tech Blacksburg, UA
The size of dc-bus capacitor is the key contributor for the volumes of PFC and battery charger,
whose important characteristics is the 2nd order
low-frequency ripple power on the DC bus. The motor in an
electric vehicle can be used to store the ripple power, thus significantly reducing the size of the dc-bus capacitor. In this pa-
107
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
per, a novel principle for Energy Storage in PFC by EV motor/generator is proposed. A digital controller is used to regulate the converter by using PWM, resulting in small volume,
low noise and high power density. The size of the dc-bus capacitor is reduced 10 times.
K.J. Tseng
An Online Calibration Algorithm of SOC for
LiFePO4 Battery by using Characteristic Curve
pp. 2108-2112
China Electric Power Research Institute
Jizhong Chen
China Electric Power Research Institute
Juan Hu
China Electric Power Research Institute
Huanling Wang
China Electric Power Research Institute
Shouping Xu
China Electric Power Research Institute
C.C. Sun
Hohai University
Modeling and Simulation of Battery Energy
Storage System (BESS) Used in Power System
pp. 2120-2125
Tian Xia
China Electric Power Research Institute
Muyi Li
China Electric Power Research Institute
Peng Zi
China Electric Power Research Institute
Liting Tian
China Electric Power Research Institute
Xiaohui Qin
China Electric Power Research Institute
Ning An
China Electric Power Research Institute
For reflecting grid connected operation control strategies,
modeling of Battery Energy Storage System (BESS) was studied. The BESS models include two parts according to the infection to control results of State of Charge (SOC) of batteries.
One is the electromechanical transient model, and the other is
the long-term dynamic model. The convertor section of the
models consider power control segment in normal operating
mode, and fault crossing and protection segment reflecting
output external characteristics in abnormal operating mode. In
the capacity limit aspect, the actual voltage-SOC curve of battery is introduced in the models. Meanwhile, the charging and
discharging character-istics can be simulated accurately. The
validity of the proposed models is proved according to calculation results after taking BESS models into single generator
system for simulation. In this paper, BESS models are established from the perspective of power grid and to realize the
target of grid connected control, the models have generality,
and they are suitable for electromecha-nical transient and
long-term dynamic simulation. Therefore, the problems of
present BESS models, that is being complex, reflect-ing charging / discharging characteristics of different batteries but no
grid connected characteristics, and being not suitable for engineering application, can be solved.
TuD03.6
Design of Energy Storage Scheme for the
Smoothing and Dispatch Planning of Large-Scale
W ind Power Generation
pp. 2113-2119
Nanyang Technological University Singapore
November 26-29，2015 Changsha，China
Hohai University
TuD03.7
Battery Monitoring is very important for most of the electric
vehicle(EV) and battery energy storage system（BESS）since
the safety, operation and even the life of the passenger/operator depends on the battery system. Checking and
controlling the status of battery within their specified safe operating conditions is exactly the major function of battery
management system (BMS). The state of charge (SOC) is a
critical parameter of a Li-ion battery, an accurate on-line estimation of the SOC is important for forecasting the EV driving range and BESS power dispatching. A widely used method
to estimate SOC is based on coulomb counting, due to the uncertainty, including unit-to-unit variation, measurement noise,
operational uncertainties, and model inaccuracy, it’s difficult
to estimate the SOC by using coulomb counting, an online inference of open-circuit voltage (OCV) is used to calibrate the
SOC, however, a relatively flat OCV curve of LiFePO4 will
lead to the error of SOC is large. In this paper, an algorithm
using the derivation curve (dV/dQ vs Q) to calibrate the SOC
on-line is bring out. The SOC estimation has been implemented using coulomb counting and derivation curve methods
thereby eliminating the limitation of the stand-alone coulomb
counting method. Finally, by utilizing the actual operation data,
experiments and numerical table were conducted, show that
this SOC calibrate algorithm based on characteristic curve has
better robust performance of the practical application of
LiFePO4 battery energy storage system.
M.T. Li, S.S
Y. Yuan
The paper examines the use of energy storage system to
smoothen the output power from wind farms, and to make
dispatch planning from the wind power generators possible.
Firstly wind power is segregated into components through the
use of filters designed from the application of empirical mode
decomposition technique. Buffering of the high- and
mid-frequency components of the wind power is then effected
through the use of battery-supercapacitor banks, while the
low-frequency components of the wind power are used in conjunction with a pumped-hydroelectric storage system to realize
short-term dispatch planning. The proposed method is illustrated using data obtained from an existing wind farm.
TuD03.5
Chaoyong Hou
Nanyang Technological University Singapore
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TuD03.8
TuD04.2
Compound Energy Storage Control of W ind
Power Base on Wavelet Decomposition
A Novel Control Method for Islanding Mode Microgrid with Unbalanced Load
pp. 2126-2129
pp. 2134-2138
Huanhuan Jia
Inner Mongolia University
Tianyi Ma
Beijing Institute of Graphic Communication
Zhiyuan Qi
Inner Mongolia University
Guangyao Cheng
Zhifeng Li
Inner Mongolia University
Beijing Institute of Graphic Communication
Single-phase load in microgrid brings about negative sequence
voltage and current, deteriorating the stability of microgrid
system. The difference of microsource(MS) parameters influences the sharing negative current and reduces the reliability
of MS. Negative sequence voltage reduces power quality and
stability of microgrid. In this paper, a comprehensive control
method is proposed to improve the power stability of unbalanced load microgrid. The adjustable negative sequence virtual impedance is included in the method, which is regulated by
the negative current amplitude of MS. Through the design of
adjustable negative sequence virtual impedance, the accurate
negative current sharing is realized under islanding mode. The
effect of negative sequence virtual impedance character on
unbalanced voltage factor of Point of Common Coupling (PCC)
is also analyzed. In order to reduce PCC unbalanced voltage
factor, a kind of secondary voltage compensation method is
proposed in this paper. Experimental results validate the effectiveness of the proposed methods.
A compound energy storage system in which lead acid battery
combines with super capacitor is used to balance the fluctuation of wind power in this paper. A wavelet decomposition
method is put forward to extract control signal that contains
slowly variable low frequency signal and fluctuant high frequency signal. The slowly variable signal is applied to control
the charge or discharge of the battery. The fluctuant signal is
applied to control the super capacitor to absorb rapidly
changing energy. A control way that voltage loop combines
with current loop is used to keep the DC bus voltage steady. A
simulation study based on MATLAB is presented to verify the
correctness of proposed control strategy. Simulation results
show that the battery can be charged steadily and discharged
reasonably. In addition, the super capacitor can extract rapidly
fluctuant wind energy, and the DC bus voltage of wind power
system can be keep in steady at different wind speed and loads.
Therefore, the proposed compound energy storage control
method can satisfy the energy balance requirement in wind
power system.
TuD04.3
Based on Hybrid Algorithm of Micro-grid Islanding Detection
TuD04.1
A Novel DG Integration and Coordination Control Method for Hybrid Microgrids
pp. 2139-2143
Chao Xiong
pp. 2130-2133
Biyun Chen
Guangxi University
Zhiyue Mo
Guangxi University
Shenyang University of Technology
Yun Teng
Shenyang University of Technology
Chunlai Li
Shenyang University of Technology
Qinghai Electric Power Research Institute
Xin Lia
This paper presents a research on the integration and coordination control of distributed generation (DG) in a hybrid microgrid (MG). This approach integrates DGs by the direct
current (DC) power lines added to the local power distribution
system, while the alternating current (AC) power lines take
charge of providing the conversional power energy for the
local loads, and an energy conversion station is designed to mix
energy from the DC generation line with energy from the utility grid. The voltage stability logic controller makes it easier
and more convenient for the coordinated control between the
DGs and the utility grid, as well as avoids coping with AC integration problems, AC stability and line synchronization for
instance. Matlab/Simulink simulation tool was used to show
the robust operation performance and to validate the effectiveness of the proposed method above.
Shenyang University of Technology
Qinghai Electric Power Research Institute
Zhongjie Zhang
State Grid Tongliao Power Supply Company
Xin Yu
State Grid Dandong Power Supply Company
Micro-grids are being developed as a building block for future
smart grid system. Islanding detection is a great challenge in
connecting distributed generation (DG) in electrical power
systems. Islanding detection methods are categorized into three
groups, i.e., communication based methods, active, and passive
methods. Communication based methods are established upon
communication between utilities and DGs and have the inconvenience of being expensive and are limited in use. Active
methods perturb the system with a disturbance and the system
response to the disturbance is analyzed. This paper proposes a
hybrid islanding detection method which uses voltage unbalance (VU) and high-frequency (HF) impedance. The proposed
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method merges the advantages of both active and passive techniques. In addition, since the active method used in this paper
does not change any of the system variables as a disturbance, it
will not lead to any instability.
TuD04.6
IEC 61850 Based Testbed for Micro-grid Operation, Control and Protection
pp. 2154-2159
TuD04.4
Wei Deng
Chinese Academy of Sciences
Evaluation of the Standardization Needs of
Wei Pei
Chinese Academy of Sciences
Microgrids Technology
Ziqi Shen
Chinese Academy of Sciences
Zhenxing Zhao
Chinese Academy of Sciences
pp. 2144-2148
Hui Yu
Wenpeng Luan
Wanxing Sheng
Test of system operation, control and protection is becoming an
China Electric Power Research Institute
important part of the micro-grid technology. This paper presents a testbed for operation, control and protection of micro-grid based on IEC 61850 with RT-LAB. A hierarchical
system architecture for testbed including a system level, a bay
equipment level, and a power device level is presented, and the
design for testbed is proposed in detail. Then, experiments are
performed based on the proposed testbed to verify its validity.
China Electric Power Research Institute
China Electric Power Research Institute
Haitao Liu
China Electric Power Research Institute
Wenyuan Ma
China Electric Power Research Institute
Microgrid has played a crucial role in solving problems caused
by integration of distributed generation and therefore becomes
an effective and efficient means for promoting renewable energy utilization and improving power supply reliability. This
paper summarizes the key technologies and standardization
needs for microgrid development and applications, based on
the market needs and industry status. Some key features of a
microgrid that distinguish it from traditional power grid and
smart grid are described. After review of the relevant activities
currently undergoing in IEEE and IEC, recommendations for
microgrid standardization based on the existing work are proposed.
TuD04.7
The Improved Control Strategy of Inverters
Output Power Equipartition in Micro Grid
pp. 2160-2165
TuD04.5
Research on Autonomous Control Strategy for
DC Microgrid
PLA University of Science&Technology
Pengfei Hou
PLA University of Science&Technology
Ye Xu
PLA University of Science&Technology
Jianke Li
PLA University of Science&Technology
Jun Yan
Jianhui Su
Hefei University of Technology
Haining Wang
Hefei University of Technology
Yong Shi
Hefei University of Technology
based on the droop control method are analyzed, and a measurement method of micro grid line impedance based on clock
synchronization and Micro Grid Central Controller-(MGCC)
coordinated control is presented. Secondly the output power
ability of inverters, the active and reactive power decoupling
ability, the system dynamic property and stability are served as
the conditions of virtual impedance designed, therefore the
optimal design method of virtual impedance values is proposed.
PLA University of Science&Technology
The DC microgrid has the advantages of simpler control,
higher power conversion efficiency and lower cost compared
with AC micro grid, which is the future development direction
of smart grid. The method of autonomous control requires no
communication bus, it can improve reliability of the system
and reduce the cost of the system. Therefore, this paper studies
the key control problems of the autonomous control system of
the non-communication bus. In this paper, the design method
of DC microgrid autonomous control system is studied and
improved, several working modes are defined, with case studies in a typical DC microgrid system, the effectiveness of the
proposed method is verified by Matlab / Simulink.
November 26-29，2015 Changsha，China
Hefei University of Technology
The output power of inverters should be precise equipartition
in micro grid ,because that is the basic conditions that the micro grid system works stably for a long time. This paper proposes a improved control strategy of inverters output power
equipartition in micro grid based on virtual impedance method.
Firstly, the output power equipartition conditions of inverters
pp. 2149-2153
Jinquan Wang
Wenjin Wu
The system simulation model was set up in MATLAB, and the
simulation experiment results show that the proposed method has the effectiveness and practicability.
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limit the reactive power sharing errors and improve the power
quality, which can be applied in complex microgrid configurations. Finally, the performance of the proposed control strategy
is verified by digital time-domain simulation in
PSCAD/EMTDC software.
TuD04.8
The Study of Power Electronic Transformer on
Power Flow Control and Voltage Regulation in
DC Micro-grid
TuD04.10
pp. 2166-2172
Ke Zhou
Guangxi Grid Co., Ltd
Qingren Jin
Guangxi Grid Co., Ltd
Zheng Lan
Hunan University
Chunming Tu
Hunan University
Ming Guo
Guangxi Grid Co., Ltd
Guangshi Liu
Guangxi Grid Co., Ltd
Flywheel Energy Storage System Based on
DC/DC Converter with Integrated Magnetic
Structure
pp. 2179-2184
Xuhong Wang
Dan Li
Changsha university science and technology
Changsha university science and technology
The AC and DC distribution grids between different voltage
levels coexist in smart grids, and a reliable connector was
needed between them. Power Electronic Transformer (PET)
was suitable for being used as public interface to control power
flowing between different electricity networks and regulated
DC bus voltage, because of its abundant functions and electrical interfaces. In order to take advantage of PET served as a
power balance junction, an improved droop control method for
DC micro-grid was proposed. Power can flow bi-directionally
between DC micro-grid and AC grids by using this method.
Then the power distribution was achieved in DC micro-grid
and the stability of the DC bus voltage was enhanced. The simulation studies were carried out in three cases: system load
mutation, power fluctuation of distributed generation and
voltage sag in high voltage distribution network. The simulation results showed that the DC micro-grid was still on stable
operation in the cases above, and proved the good performance
of the improved droop control method.
Xiaofei Mai
Changsha university science and technology
Xiangqian Li
Puyang Power Supply Company
TuD04.9
TuD04.11
An Novel Hierarchical Control of Microgrid
Composed of Multi-Droop Controlled Distributed Power Resources
Optimal Operation of Microgrid Composed of
Small Hydropower and Photovoltaic Generation
W ith Energy Storage Based on Multiple Scenarios Technique
Aiming at the DC power supply instability in micro-grid, a
Flywheel Energy Storage System (FESS) based on magnetic
integrated structure bidirectional DC/DC converter is proposed. In this system, for the convertor, three magnetic elements (isolation transformer, resonant inductor and transformer) are integrated into a single core via magnetic integrated technology. The FESS can not only supply the energy
shortfall of micro-grid, but also stabilize the voltage of DC bus,
improve power quality and reliability. A DC/DC converter
10kW prototype with 460-560V input and 320V output is produced. Through experimental analysis, the project has the advantages of less components, smaller size etc, and can reduce
the current ripple effectively, will be suitable for high power
applications.
pp. 2173-2178
Wei Bao
State Grid Zhengzhou Power Supply Company
Yuehao Yan
State Grid Zhengzhou Power Supply Company
Changchun Cai
Hohai University
Bo Kong
State Grid Zhengzhou Power Supply Company
Shucheng Cheng
Hohai University
Yuanhong Chi
State Grid Zhengzhou Power Supply Company
Bing Jiang
Hohai University
Weili Dai
Hohai University
Min Wu
Hohai University
Jianyong Zhang
Hohai University
Lu Xin
pp. 2185-2190
Zhengzhou Xinli Electric Power Co.,Ltd.
To improve power sharing and power quality in ac microgrid
based on droop controlled voltage source converter, a novel
hierarchical control of ac micro-grid according to different
time scales is proposed in this paper. In short time scale, larger
droop gains is adopted to improve power sharing. In long time
scale, the no load frequency and voltage set points of droop
characteristics are adjusted to improve the voltage and frequency quality. The proposed hierarchical control can both
Microgrid is an effective way to improve the utilization of distributed renewable energy. In order to improve the operational
efficiency of the microgrid, this paper proposes an optimal
control strategy for the microgrid composed of small hydropower and photovoltaic generation with energy storage based
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on multiple scenarios technique. The probabilistic models of
distribution generation are discussed, and the optimal cutting
technology is used to reduce the sample number of microgrid
operation which can simplify the operation optimal problem of
microgrid. Based on the operational characteristics of the
photovoltaic generation and small hydropower, a mathematic
model for the optimal operation of microgrid is presented and
the objective function is the income of the power from distributed generation. Improved particle swarm algorithm is used
for the calculation of the optimal problem. The simulation results show that the optimal model of microgrid is suitable for
the operation of microgrid in different conditions and can obtain maximum benefit from the distributed generations.
concepts are evaluated by simulation results.
TuD05.3
Power Losses Analysis and Efficiency Evaluation
of High Boost Converters for PV and Fuel Cell
Applications
pp. 2201-2206
Voltage-Balancing Method for Series-Connected
IGBTs Based on FPGA
pp. 2191-2194
Univ of Shanghai for Scie and Techy
Chaoli Wang
Univ of Shanghai for Scie and Techy
Dongyuan Zhao
State Grid Smart Grid Research Inst
Aiming at the problems of voltage sharing failure and overvoltage when Insulated Gate Bipolar Transistors (IGBTs) are
utilized in series, a novel voltage-balancing method for series-connected IGBTs based on Field Programmable Gate Array (FPGA) is proposed in this paper. Firstly, the collector-emitter voltages of IGBTs are gathered and send to FPGA.
Secondly, FPGA generate control signals by using the feature
that a high level voltage is applied to gate while the collector-emitter voltage goes to down. The total signal of control
signal by FPGA and original switching signal from original
power electronic device is acted as the input of gate driver.
Lastly, simulation results verify the validity of the method in
this paper.
Antonella Ragusa
I.S.S.I.A – C.N.R. U.O.S
Zilong Xiao
Huazhong University of Science and
Technology
Dan Wang
Huazhong University of Science
and Technology
Qing Xiong Department of Power System Research
Electric Power Research Institute
Chengxiong Mao
Huazhong University of Science and
Technology
Jiming Lu
Huazhong University of Science and
Technology
Linglong Cai
Huazhong University of Science and
Technology
In renewable energy power conditioning system (PCS), like
photovoltaic and fuel cell sources, the low input current ripple
represents a very important issue to improve the source efficiency. This paper proposes a topology of a DC-DC high gain
boost converter with a zero input current ripple condition. In
particular, this result is obtained by using coupled inductors. A
detailed mathematical analysis on the operating principle, the
steady-state analysis and the comparison with the same topology without coupled inductors is presented. The proposed
November 26-29，2015 Changsha，China
I.S.S.I.A – C.N.R. U.O.S
Efficient Modeling of Cascaded-Multilevel Static
Synchronous Compensator on Electronicmagnetic Transient Simulation Program
pp. 2207-2214
Free Ripple Input Current High Boost Converter
with Coupled Inductors
pp. 2195-2200
I.S.S.I.A – C.N.R. U.O.S
Antonella Ragusa
TuD05.4
TuD05.2
Giuseppe Marsala
I.S.S.I.A – C.N.R. U.O.S
In renewable energy power conditioning system (PCS), like
photovoltaic (PV) and fuel cell sources, the low input current
ripple represents a very important issue to improve the source
efficiency. This paper presents an analysis of the power losses
and efficiency of two high boosting converters for PV and fuel
cell applications, designed by the authors. The two converters
are characterized by a single switching device and, the first
topology, by a reduced input current ripple and, the second
one, by a zero input ripple condition. In particular, the free
ripple condition of the second topology is obtained by coupling
the two inductors that are uncoupled in the first topology. A
detailed mathematical analysis of the power losses and efficiency is presented together with an evaluation of the effects on
the efficiency caused by coupling the inductors. The proposed
concepts are demonstrated by simulation.
TuD05.1
Ranyue Li
Giuseppe Marsala
Cascaded-Multilevel STATCOM (CM-STATCOM) is of great
development potential in reactive power compensation device.
But it consists of large number of semiconductor devices which
significant increases the simulation time in electromagnetic
transient simulation program. This paper proposes an efficient
model of CM-STATCOM based on Dommel algorithm, which
replaces the arm circuit with Thevenin equivalent circuit and
numerical calculation block. This paper also introduces ideal
switching devices to reduce computation quantity in calcula-
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
tion block. The proposed model that preserves the individual
identity of H-bridge and interface to control system is of wide
applicability and high accuracy. Besides, the size of nodal admittance matrix is reduced by several orders of magnitude so
that the simulation time is reduced drastically. The proposed
model is validated in PSCAD/EMTDC under different condition by comparisons with traditional model.
ble. Use the simulation software FEMM, the magnetic flow
distribution and magnetic circuit structure are analyzed. This
method is convenience to the magnetic flow analysis. With the
data comparison between the magnetic flow and magnetic potential, the magnetic circuit model and magnetic potential
equations can be found out. Through comparison with different magnetization curve models, this paper gives a mixed separated magnetization curve fitting method, which is very suitable to orthogonal extinction coil. And this simulation method
is very important to the research on the orthogonal core. Based
on this curve research, this paper also analyzes the control
characteristic control ex-characteristic and adjustment characteristic.
TuD05.5
Instantaneous Compensation Strategy of DC
Voltage Component in the Digital-Analog Integrated Simulation Interface
pp. 2215-2220
Linglong Cai
TuD05.7
Huazhong University of Science and
A Design for High Voltage DC Power Supply
pp. 2227-2231
Technology
Chengxiong Mao
Huazhong University of Science and
Technology
Jie Zeng
and Technology
Jiming Lu
and Technology
Junlin Li
Huazhong University of Science
Huazhong University of Science
Huazhong University of Science and
Digital-Analog integrated simulation combines the advantages
of digital simulation with the advantages of physical simulation.
The applicability of traditional simulation system is increased.
The DC component of output voltage restricts the versatility of
Digital-Analog integrated simulation. Unlike general inverters,
the inverter of Digital-Analog integrated simulation interface
(DAISI) has its unique features. A new control strategy is put
forward to restrain the steady and transient DC component
without additional hardware circuit. The feedback control loop
along with the output voltage control loop adjust the duty cycle
of sinusoidal pulse width modulation which compensate for the
DC voltage component in the DAISI. Simulation and experiment verify the effectiveness of the control strategy.
TuD05.8
A Research and Implementation of DigitalTechnologies of Natural Sampling SPWM for
Three-Level NPC Inverter Based on FPGA Technology
pp. 2232-2237
TuD05.6
Analysis of Orthogonal Controllable Extinction
Coil Characteristic
pp. 2221-2226
Jie Liu
Hebei University of Science and Technology
A novel DC high voltage power supply is presented. The device
takes 220V AC as input, through the AC inputrectifier-inverter
boost-doubler rectifier to get DC high voltage. The device obtains about 300V DC voltage through the fullbridge rectifier.
The pulse-width modulation DC/DC links makes DC voltage
adjustable. Then the DC voltage is converted into
high-frequency AC square wave voltage which will be boosted
by the high frequency high voltage transformer. Finally, the
doubler rectifier circuit outputs the required 0~30kV adjustable DC voltage. AT89S51 is adopted as the control core. LCD
screen displays the current voltage. The AT89S51 microcontroller PWM wave is generated through software programming as the control signal of the chopper. Two complementary
PWM wave were generated to control the inverter circuit. The
AT89S51 compare the feedback voltage and reference voltage
required, modulation PWM wave that is to change the duty
cycle to achieve highperformance adjustable DC. Simulation
and experimental results verify the correctness of theoretical
analysis and design.
Technology
Xiaoxia Wei
Hebei University of Science and Technology
Zhaowen Dong
Electric Power Research Institute of
Guangdong Power Grid Co. Ltd.
Dan Wang
Jianye Liu
State Grid Energy Research Institute
Heilongjiang State Grid Company
Tiezhong Wei
Heilongjiang State Grid Company
Lirong Wang
Heilongjiang State Grid Company
Jian Liu
Wuhan Institute of Technology
Wei Tang
Wuhan Institute of Technology
Hao Zhang
Wuhan Institute of Technology
Hua Zeng
Wuhan Institute of Technology
Yao Zhou
Wuhan Institute of Technology
KaiCheng Xiong
The orthogonal extinction coil is reliable and easily controlla-
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With the application of digital sinusoidal pulse width modulation (SPWM) control technologies, we can improve the output
accuracy of the pulse width control signal, shorten the control
respond time, and reduce the harmonic content of the output
waveform. In this paper the digital theory of natural sampling
SPWM is study with the combination of characteristics of high
voltage and high power three-level NPC inverter. A framework
of full digital natural sampling SPWM is set up. The digital
realization method of triangular carrier wave and sinusoidal
modulation wave generation, switching states combination and
dead time configuration are studied in detail. And there comes
up with a FPGA based hyper-real-time duty cycle calculation
method, by using this method the Taylor series expansion and
convergence judgment could be avoid. The output waveform
can be achieved through the effect of natural sampling，
compared with regular sampling, which is less harmonics in
output waveform. At the end of this paper, the theory research
has been realized by using VHDL language and a FPGA chip.
The software simulation and experiment results prove the correctness and the feasibility of the digitization theory.
VSC-HVDC system, such as in offshore wind farms, will be
widely used in the next few years. The controller parameters of
both rectifier and inverter will have a great impact on both the
system itself and the other parts of the transmission system due
to the connection of DC transmission line. Usually, the controller parameters on each side are designed and tested separately.
Therefore, the performance of the whole system can hardly
achieve the best operation state. In this paper, a new method of
coordinated optimization considering DC line is proposed. A
united transfer function model is also established. Then, according to ITAE (integral of time multiplied by the absolute
value of error) criterion, the parameters of both converters are
optimized simultaneously. Simulation results verify the correctness and effectiveness of the proposed optimization method.
TuD05.11
Design of soft start in self-powered circuit for
IGBT power modules in series
pp. 2249-2252
TuD05.9
Single Carrier
SPWM
Grid-Connected Inverter
Hybrid
Cascade
pp. 2238-2242
Yuan Jin
State Grid Beijing Electric Power Company
Xiu Lan Liu
State Grid Beijing Electric Power Company
Shuang Zeng
State Grid Beijing Electric Power Company
Zhongyuan Chen
Smart Grid Research Institute of SGCC
Zhixia Wang
Smart Grid Research Institute of SGCC
Zou Ge
North China Electric Power University
Series-Connected insulated gate bipolar transistor (IGBT) is
the important basis in the high voltage and power converter
application. A long duration of the excessive inrush current
occurs in self-powered circuit when IGBT power modules in
series start working. A design method of soft start of
self-powered circuit is presented in this paper. The rise time of
voltage of the capacitance stored energy is extended, the inrush
current is reduced and easing the current stress IGBT module
in series and diode can withstand by this method. The simulation model of soft start is realized by Saber and experimental
results are used to illustrate both correctness and defensiveness
of the proposed method to reduce the inrush current, protecting IGBT module and diode in self-powered circuit.
This paper describes a hybrid cascaded inverters, which can be
applied to low power energy storage system. The working
mode of the circuit and the dead-time effect are analyzed. Base
on the traditional control mode, a new way is given to control
the auxiliary capacitor voltage. In order to solve the problem
that multilevel SPWM method take up to much system resources, this paper put forward a single carrier SPWM method,
which can be implemented efficient for the inverter. To verify
the feasibility of the system, a simulation model and a low
power inverter was constructed and results are provided.
TuD05.12
TuD05.10
A Novel Comprehensive Control Scheme of
Modular Multilevel Converter-Based Power
Electronic Transformer
pp. 2253-2258
Coordinated Optimization of VSC-HVDC Controller Considering DC Line
pp. 2243-2248
Beibei Qi
Hohai University
Chong Li
Jiaxing Electric Power Company
Yuqing Jin
Hohai University
Ke Tao
Hohai University
Qian Chen
Hohai University
Ping Ju
Hohai University
Hongyu Li
Shandong University
Guangzhu Wang
Shandong University
Jiangzhou Feng
Shandong University
Xiujuan Shang
Shandong University
In this paper, the modular multilevel converterbased power
electronic transformer (MMC-based PET) is studied. This
topology is suitable for high voltage and large power capacity
Hohai University
November 26-29，2015 Changsha，China
Qin Wu
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
situations, such as DC power distribution network. Only one
medium frequency transformer is used in the PET structure,
reducing the size and weight. A series inductor is added to the
DC side of MMC which can improve the characteristics of the
topology. By analyzing the structure of MMC stage, a comprehensive control scheme is proposed. Based on the small signal
model of output stage, a phase shift closed-loop control scheme
is designed for output stage. The control schemes of MMC
stage and output stage are independent of each other. A Simulink model is built in Matlab, and the simulation results verify the effectiveness of the topology and the proposed control
scheme.
Jinmu Lai
JianDai
Zhe Zhang
Minghao Wen
Combining switching characteristics of power electronic devices and state transitions in carrier phase-shifted SPWM
(CPS-SPWM), this paper uses graphic Stateflow toolbox of
Matlab/Simulink to design the process of CPS-SPWM. Then it
is applied to STATCOM which is integrated with distribution
transformer (DT-STATCOM) for PWM signal generation.
Simulation results are presented to prove that the method is
valid and effective for reactive power compensation. Meanwhile, softwarein-loop (SIL) test and automatic code generation are also carried out. Results of experimental test with DSP
TMSF28335 have validated the theoretical contributions of the
paper. PWM signal comparison of both simulation and experiment result shows that this method has both the feasibility
and effectiveness of software and hardware design. With this
method, design of CPS-SPWM can be more rapid, efficient
and convenient.
TuD05.13
Low Output Frequency Operation of Modular
Multilevel Matrix Converter
pp. 2259-2264
Xiujuan Shang
Shandong University
Guangzhu Wang
Shandong University
Feng Li
Shandong University
Qin Wu
Shandong University
Jianzhou Feng
Shandong University
TuD05.15
When the multilevel modular matrix converters (MMMC)
operate at low frequency, sub-module (SM) capacitors voltage
mainly contains doubling-output frequency component inversely proportion to output frequency, especially when
MMMC operate at zero frequency, the voltage ripple of SM
capacitor can be infinite in theory. This paper proposes two
methods to solve the voltage ripple problem of MMMC operating at low frequency, even near zero. The first one injects
high frequency zero-sequence voltage on the neutral point and
injects high frequency negative-sequence currents to each
phase. To suppress low frequency fluctuation, the magnitude
and phase angle of the zero-sequence voltage changes according to low frequency power, without complicated calculation.
The second method is called following feedback low frequency
ripple envelope method. The low frequency ripple voltage is
calculated by difference between the reference voltage value
and the average voltage value of each phase, then got eliminated by use of feedback close-loop control. In this way, low
frequency ripple can be detected and minimized. The
Matlab/simulink simulation is built and the results have confirmed the validity and effectiveness of these methods.
Study On the Optimal DC Voltage Control For
Power Electronic Transformer
pp. 2270-2275
Guangxi Grid Co., Ltd
Hongbo Chu
Guangxi Grid Co., Ltd
Yangkai Hu
Hunan University
Hunan University
Zhiyuan Sun
Guangxi Grid Co., Ltd
Mosi Liu
Guangxi Grid Co., Ltd
Power electronic transformer (PET), the key equipment for
future smart grid, is vital for the whole power grid to be in
normal operation. The mathematical relationship between the
DC-link voltage and the system parameters for PET were analyzed in this paper. Based on the analysis, the optimal DC-link
voltage for PET is obtained by mathematical deduction. Then,
a novel adaptive voltage regulation method is proposed, in
which the DC-link voltage reference value will be maintained
in the required optimal voltage level, and it also can be adaptively changed according to different grid voltage levels and
load levels. Therefore, PET can avoid the grid voltage and load
level fluctuation impact on the input current distortion and
output voltage stability. Finally, representative simulation results in PSCAD/EMTDC verify the validity and effectiveness of
the optimal DC-link voltage design and the proposed adaptive
voltage regulation method.
Stateflow Based Carrier Phase-Shifted SPWM
and its Application in DT-STATCOM
pp. 2265-2269
Xianggen Yin
Ke Zhou
Zheng Lan
TuD05.14
Haihuan Wu
Huazhong University of Science and
Technology
Huazhong University of Science and
Technology
Huazhong University of Science
and Technology
Huazhong University of Science
and Technology
Huazhong University of Science and
Technology
Huazhong University of Science and
Technology
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
archy control method, which keeps voltage balance of SM capacitors better than that with the nearest level control; thirdly,
circulating current is suppressed inherently, removing the need
of the standalone circulating current suppressing controller.
Simulation results based on PSCAD/EMTDC prove the effectiveness of proposed strategies.
TuD05.16
The Research on Security and Stability of PWM
Technology
of
High-Voltage
Three-Level NPC Inverter
High-Power
pp. 2276-2280
TuD06.1
Jian Liu
Wuhan Institute of Technology
Hua Zeng
Wuhan Institute of Technology
Wei Tang
Wuhan Institute of Technology
Yao Zhou
Wuhan Institute of Technology
A Hybrid Compensation Method for Electric
Railway’s Power Quality Improvement
pp. 2287-2292
Hao Zhang
Wuhan Institute of Technology
Yuanyuan Sun
Shandong University
Chuankai Dai
Shandong University
Kaicheng Xiong
Wuhan Micro Hydrogen New Energy Co., Ltd
Jiaqi Li
The security and stability operation mechanism is the key
problem of the high power and voltage three-level neutral
point clamp inverter[1]. As the security and stability of PWM
is very important for normal operation of system, the control
strategy and algorithm are the basis for the safety operation of
the inverter. In the process of starting up the inverter, the optimal settings of minimum pulse width and secure access are
the most important problems needed to be solved. In the normal operation process of the inverter, the accuracy algorithm
of PWM output region identification and the dead zone insert
need to be fully considered. The treatment method during the
emergency stop time of the inverter is also one of the key contents of improving security and stability. And the theoretical
innovation through the multi-disciplinary overlapping (such as
power electronics, intelligent technology) should be adopted.
Combined with existing achievements, this paper carries out
research in the aspects of improving security and stability of
PWM of high-voltage and high-power three-level NPC inverter.
The results lay a theoretical and experimental foundation for
the following theoretical research.
Qingdao Electric Power Company
Electric railway brings many power quality problems to the
public power system. In this paper, a new power quality improvement method is proposed which can alleviate the voltage
unbalance and low power factor problem of electric systems.
The method is composed of a specially connected three phase
to two phase transformer and a phase balancing device. The
specially connected transformer has the following common
characteristic: secondary voltages are equal in magnitude and
differ 90 degrees in phase angle. Such transformers include
Scott Transformer, Le-Blanc Transformer, and modified
Wood-bridge Transformer and so on. The phase balancing
device consists of two parts: one is used to regulate the power
factor to unity; the other part is to transfer power flow between the two feeders, thus balancing their loads. With the
proposed scheme, negative current can be eliminated and
power factor can be regulated to unity. The advantage of the
new method is that it is very simple and cost-effective. Validity
of the proposed method is verified by simulation results. The
capacity of the compensation device is also analyzed in the
paper.
TuD05.17
TuD06.2
Two Control Strategies of Modular Multilevel
Converter in Rectifier Side Based on Arm Current
Under Unbalanced Voltage Condition
pp. 2281-2286
Three-level APF Control Strategy Based on the
Double Sampling T iming Comparison
pp. 2293-2298
Jian Wu
Harbin Institute of Technology
Zhujian Ou
Shandong University
Yanfei You
Harbin Institute of Technology
Guangzhu Wang
Shandong University
Yue Qi
Harbin Institute of Technology
Jianzhou Feng
Shandong University
Dianguo Xu
Harbin Institute of Technology
Two control strategies for MMC in rectifier side based on arm
current control are proposed in this paper. The strategies work
well both under balanced and unbalanced voltage conditions.
The proposed strategies have the following advantages: firstly,
ac side current is well balanced under unbalanced condition by
adjusting the active power flowing from arms to dc bus; secondly, arm current reference is obtained by using multihier-
November 26-29，2015 Changsha，China
High frequency harmonics generated by active power filter
(APF) play a negative role on the power quality of grid. To
eliminate the impact without reduction on harmonic compensating effectiveness, this paper proposed a three-level diode-clamped APF topology. Besides, the double sampling and
the neutral voltage balancing technology based on the short
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vector switching were utilized to accomplish the timing comparison control strategy proposed in this paper. Moreover, the
influence of feedback current sampled position and the system
delay on APF performance were also analyzed in this paper.
Finally, an experimental prototype was established, and the
whole scheme was validated by the experimental results.
variation in each cycle, the stuff can assess the state of the
windings. This technique does not call for any special equipment and has clear judgment standard. Thus, it is possible to
realize on-line monitoring. Finally, PSCAD simulation and
dynamic simulation experiment verified the practicality and
validity of the proposed method.
TuD06.3
TuD06.5
Thevenin Equivalent Circuit Parameter Estimation for the PCC Upstream System
pp. 2299-2303
Yuanyuan Sun
Shandong University
Chuankai Dai
Shandong University
Jiaqi Li
Online Monitoring Of W inding Deformation And
Error Analysis Based On Transformer Impedence
Circle Character
pp. 2310-2315
Fei He
Qingdao Electric Power Company
The Thevenin equivalent circuit parameters for the upstream
system seen at a load bus plays an important role in the power
system operation and planning. In order to accurately estimate
the Thevenin equivalent parameters for the upstream supply
system, an estimation method not requiring synchronized
measurement is used in this paper. The characteristics of the
probability curves of load voltage and impedance fluctuations
have been analyzed, based on which the data selection criteria
has been established. The field measurement data from different substations are processed by the proposed methods, and
abnormal data has been filtered out in order to increase the
accuracy of the estimated parameters. The validity and accuracy of the proposed method has been verified by both the
simulation and field measurement data.
Xiaojing Zhang
Xi'an Jiao tong University
Haiyang Song
State Grid Jiangsu Power Supple Company
Yu Zhang
State Grid Jiangsu Power Supple Company
Zhiguo Hao
Xi'an Jiao tong University
Qifei He
Xi'an Jiao tong University
Peng Wu
State Grid Jiangsu Power Supple Company
Guozhen Chen
State Grid Jiangsu Power Supple Company
Xi'an Jiao tong University
This paper introduced the main point of three winding transformer impedance circle characters that is constructing the 3D
locus between the voltage differences in the highand low-(or
middle-) sides of a particular phase against the currents of this
two windings. In additional, error terms caused by exciting
current of both two winding and three-winding transformer
have been analyzed. Current compensation was employed to
reduce error. A Matlab code was developed to calculate the
feature parameter of the impedance circle character. Winding
deformation can be diagnosed by comparing the index with the
fingerprint. PSCAD simulation and fault recorder analysis
results show that the technique is free from load, does not call
for any special equipment and enable on-line monitoring.
Transformer Impedence Circle Character Based
W inding Deformation Online Monitoring
pp. 2304-2309
State Grid Jiangsu Power Supple Company
Xiaojing Zhang
Zhiguo Hao
TuD06.4
Guozhen Chen
State Grid Jiangsu Power Supple Company
TuD06.6
Construction Programs and Applications of AVC
System for Regional Power Network
pp. 2316-2319
Xi'an Jiao tong University
This paper introduced a novel on-line transformer winding
deformation monitoring technology. That is constructing the
locus of the voltage difference on both sides of the transformer
changes with the primary side current. Results show that the
locus is an ellipse and we name it the transformer impedance
circle character. Mathematical methods were applied to analyze the characteristics of the impedance circle, as well as the
factors that influence the shape of it. Indicators such as eccentricity ratio and deviation angle, which is free from of running
condition but sensitive to internal fault, were established to
evaluate the state of winding. Indexes established in normal
condition are determined as fingerprint. By comparing the
Lei Guo
Jinshan Power Supply Company
Shiwei Gao
Jinshan Power Supply Company
Feng Gao
Jinshan Power Supply Company
Dan Zhou
Jinshan Power Supply Company
In recent years, the AVC technology has been widely used as a
main method of centralized monitoring, analysis and calculation for reactive power and voltage state in the whole power
grid. It’s optimally controlled from an overall angle for
wide-area distributed power grid reactive device. The AVC
system of Jinshan District is based on the OPEN3000 platform.
In the process of system running, we are faced with many
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problems. We propose the Voltage and Reactive Power
closed-loop control system should aim at reducing the whole
network loss and onload voltage regulating joint adjustment
numbers, ensuring each node voltage qualification and the
most reasonable compensation of Capacitor equipment operation, while it should also keep in the core of the Centralized
Control Center (Dispatching Center or Distribution Center), to
the principle of Expert system and Fuzzy control, and as a
mean of on-load voltage regulating joint gear in each substation and capacitor switching regulator control and coordination. The solution effectively improved the bus voltage qualification rate and reduced the equipment operation numbers and
the reactive power loss. The AVC system is running in good
condition at present.
phase-shifting transformer, the proposed topology is composed
of cascaded H-bridge diode rectifier and boost circuit modular
units, by which the high power factor rectify, the output of
stabilized voltage of cascaded modular units and voltage-sharing control can be implemented. The basic working
principle of the proposed topology, mathematical modeling and
phase diagram of the circuit and its steady state characteristics
are discussed, and corresponding control strategy is given. The
feasibility of the proposed topology and control strategy is validated by simulation results and experimental results.
TuD06.9
Overview of the Instantaneous Reactive Power
Theory in Three-Phase Systems
pp. 2331-2336
TuD06.7
The Electromagnetic Transient Modeling
andSimulation of 10 kV/400 V EPT
pp. 2320-2325
Xiang Liang
Huazhong University of Science and Technology
Yiran Liu
Huazhong University of Science and Technology
Yun Yang
Huazhong University of Science and Technology
Chengxiong Mao
Xiangping Kong
Research Institute
Yubo Yuan
Haosheng Huang
Dan Wang
Huazhong University of Science and Technology
Ye Wang
The wide application of power electronic equipment results in
severe non-sinusoidal phenomena, making the conventional
steady-state reactive power theory no more applicable. In order to deal with the harmonic compensation and power factor
correction under the non-sinusoidal condition, scholars have
carried out lots of research works. This paper discusses and
compares several commonly used instantaneous reactive power
theories, and pointes out the relationships and differences of
them. The work of this paper contributes to better understanding of the instantaneous reactive power theories.
TuD06.10
Assessing the Harmonic Current Emission Level
of the Residential Loads Based on the Impedance Gathering Trend
pp. 2337-2341
TuD06.8
New Cascade Diode H-bridge Multi-level Rectifier
pp. 2326-2330
China University of Mining & Technology
In allusion to current circulation through the switch and the
corresponding diode rectifier bridge in certain conditions
leading to other cascaded diode rectifier bridges withstand the
full supply voltage in traditional cascaded diode H-bridge multi-level Rectifier，a novel cascade diode H-bridge multi-level
structure is proposed. Not needing power frequency
November 26-29，2015 Changsha，China
Jiangsu Electric Power Company
Research Institute
Electronic Power Transformer (EPT) is capable of improving
power quality without additional devices; hence it has the potential of pervasive application in prospective utility grid.
Ahead of field test, transient analysis of EPT is necessary to
verify power supply reliability as well as ensure safety. In this
paper, the Electro-Magnetic Transient (EMT) simulation model of an industrial prototype of 10kV/400V/500kVA unidirectional EPT is built in PSCAD/EMTDC. Then the validation of
the model and case studies under fault conditions are carried
out. Simulation results show that the prototype can withstand
phaseto-phase and phase-to-ground faults and sustain regular
output after timely adjustment.
Xiangbei Jiang
Jiangsu Electric Power Company
Research Institute
and Technology
Huazhong University of Science and Technology
Jiangsu Electric Power Company
Research Institute
Huazhong University of Science
Jiming Lu
Jiangsu Electric Power Company
Yang Fu
Shanghai University of Electric Power
Guang Chen
Shanghai University of Electric Power
Bo Tang
Shanghai University of Electric Power
Shunfu Lin
Shanghai University of Electric Power
Bo Tang
Shanghai University
Due to the widespread applications of new energy and the
power electronic residential loads in the distribution network,
it is very necessary to assess the harmonic current emission
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
distribution method. The analysis results of practical cases
prove that the cloud transform is capable of fitting the harmonic current distribution curves in high precision, and presenting the multi-modal characteristics of the distribution
curves well.
level since the impact of the collective harmonics cannot be
ignored. The calculation of the harmonic impedance is a crucial task to determine the harmonic responsibilities at the point
of common coupling (PCC). This paper presents a method to
quantify the harmonic current responsibilities of the system
side and customer side based on the impedance gathering
trend, and then to calculate the emission level of the residential
loads. This study has a sparked phenomenon on the evaluation
of current emission level of the residential loads and can reflect
the residential load harmonic emission characteristic precisely.
TuD06.13
Influence of Distributed Generation on Distribution System Voltage Stability
pp. 2352-2355
TuD06.11
Meimei Xu
Identification of Transient Power Quality Disturbances Based on FCM
pp. 2342-2346
Hehong Guo
Jinzhong Electric Power Company
Qingsheng Zhao
Taiyuan University of Technology
Yuhuan Han
Taiyuan University of Technology
Guizhou Power Grid Co., Ltd.
Zuyi Ren
NARI-Relays Electric Co., Ltd.
Yong Xiao
Guizhou Power Grid Co., Ltd.
Yang Bai
NARI-Relays Electric Co., Ltd.
Xiankui Wen
Guizhou Power Grid Co., Ltd.
Junfang Zhang
Nanjing University of Science and Technology
Zhiqian Bo
XUJI Group of SGCC
Interconnected operation of distributed generation (DG) will
become the future trend. This paper studies the voltage stability of distribution network with DGs. According to different
network interfaces and operating modes, DGs are classified
into four different node types. The processing methods in
power flow calculation are also analyzed in this paper. Then
voltage stability condition of distribution network is derived
out based on the power flow solution. According to four types
of DGs, simulations and analysis of the impact on the voltage
stability index are conducted. Simulation results show that the
voltage stability is reduced by accessing PV-type DGs, and the
quantity of PV-type DGs should be limited. Additionally, the
voltage stability of distribution network is improved by accessing PQ-type DGs on different location and capacity.
This paper presents a new hierarchical identification method
for transient power quality disturbance based on fuzzy
C-mean clustering (FCM) algorithm. The method consists of
five function modules. By use of the ensemble empirical mode
decomposition (EEMD) and singular value decomposition
method, we can extract effective feature vectors layer by layer,
which are used as the input of FCM. In this way the optimized
classified matrix and clustering centers are obtained. According to the Euclidean distance between the unknown-sample
records and the known-sample ones, the disturbance type is
identified. Simulation results of common kinds of transient
disturbances indicate that this method is accurate and has a
potential application in engineering.
TuD06.14
TuD06.12
Current Control of Active Power F ilters Assisted
by three-state hysteresis
pp. 2356-2359
A Study On The Probability Distribution Of The
Residents Load Harmonic Collective Effect Based
On Cloud Theory
pp. 2347-2351
Bo Tang
Shanghai University
Shiwei Ma
Shanghai University
Guang Chen
Shanghai University of Electric Power
Shunfu Lin
Shanghai University of Electric Power
Xuan Sun
Changsha University of Science and Technology
Xin Tang
Changsha University of Science and Technology
In this paper, repetitive control is employed to design the current controller of active power filter for reducing the
steady-state error due to periodic command. Zero steadystate
error for current harmonics is realized. Harmonic reduction
and power factor correction will both be carried out by the
proposed filter. Discussions on the design of the current and
voltage control loops are given. Experimental results verified
the feasibility of the proposed method, obtained from a 10KW
shunt active power filter.
This paper introduced the cloud theory briefly firstly, then
presents a method based on the cloud theory to access the collective harmonic influence of the residential loads, which can
identify the harmonic sources so as to determine the harmonic
suppression scheme. For the residential harmonic current
probability distribution has multiple peak values, the cloud
transformation method has more advantages than the normal
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modeled as an event-driven system using SimEvents® toolbox
and energy grid is modeled as a time-driven system using
SimPowerSystems® toolbox. Co-simulation results are obtained by combining different communication scenarios and
time-varying irradiance scenarios for the PV plant when this
one is required to provide a certain power in response to a
power reference received from SCADA over the communication network. The analysis aims at illustrating the impact that
stochastic behavior and delays due to network communication
have on the global system behavior.
E: Smart Grid Technology
TuE01.1
A Reliability Evaluation Model for Intelligent
SubstationSecondary System based on Variation
Coefficient Method
pp. 2360-2364
Zhongqing Li
Wei Li
Hao Li
Kun Yu
Hang Zhao
Xiangning Lin
China Electric Power Research Inst
China Electric Power Research Institute
Huazhong Univ of Science and Tech
Huazhong Univ of Science and Tech
Huazhong Univ of Science and Tech
Huazhong Univ of Science and Tech
TuE01.3
WDM Switch Technology Application in Smart
Substation Communication Network
pp. 2373-2376
It is important to establish reliability analysis model of secondary system for the intelligent substation. In this paper, a
method is proposed to evaluate the reliability of secondary
system in smart substation. Firstly, according to the reliability
indices of secondary system structures for different smart substations,the evaluation matrix are determined andthe matrixcan beorthogonalized to makes it non dimensional. Secondly, the mean, standard deviation, coefficient of variation,
and weighted vector of the matrix are calculated. Then, the
weighted data matrix of ideal sample and negative sample is
determined. Finally, according to the correlation degree ranking method, the reliability evaluation of each index is obtained.
Forpractical examples, this method can be used to identify the
factors influencingrealiability of intelligent substation. The
method can be used to select an appropriate network topology,
improving the reliability of the design level of substation
communication system.
Co-simulation of a Low-Voltage Utility Grid Controlled over IEC 61850 protocol
pp. 2365-2372
Info and Comm Inst China Smart Grid Rese
Zhansheng Hou
Info and Comm Inst China Smart Grid Rese
Min Xu
Info and Comm Inst China Smart Grid Rese
Lin Peng
Info and Comm Inst China Smart Grid Rese
Haiyun Han
Info and Comm Inst China Smart Grid Rese
TuE01.4
Grenoble Alpes University
Grenoble Alpes University
“Dunărea de Jos” University of Galaţi
Bratcu Grenoble Alpes University
Substation Alarm Information Processing Based
on Ontology Theory Analysis Correlation Modeling of the O il Flow of Transformer and Temperature
pp. 2377-2382
This papersis Correlation Modeling of the Oil Flow of Trans
presents a co-simulation model using MATLAB® toolboxes to
illustrate an interaction between the communication system
and the energy grid, coherent with the concept of smart grid
that employs IEC 61850 communication standard. The MMS
(Manufacturing Message Specification) protocol supported by
IEC 61850, based on TCP/IP, is used for the vertical communication between the Supervisory and Data Acquisition
(SCADA) system and Intelligent Electronic Devices (IEDs)
embedding the local control of different parts of the smart grid.
In this paper an IED supporting the power control of a photovoltaic (PV) plant connected to a low-voltage (LV) utility grid
is considered. Communication system consisting of the
transport layer and a router placed on the network layer is
November 26-29，2015 Changsha，China
Info and Comm Inst China Smart Grid Rese
Gang Wang
By analyzing the typical communication networking method of
Process Layer in Smart Substation, this paper proposes the
problems of current widely used Process Layer communication
isolation network by using VLAN Technology. This paper expounds the basic principle and advantage of using WDM
technology to realize the Switch, proposes the Security isolation communication networking method of using WDM Switch
in Smart Substation Process Layer. This method has obvious
advantages than the current VLAN logic isolation method in
theory, truly meets the "Three Networks In One" needs of
Smart Substation Process Layer communication network.
TuE01.2
Ekanki Sharma
Claudiu Chiculita
Yvon Besanger
AntonetaIuliana
Xingchuan Bao
Zhiwei Liao
Sheng Liu
South China University of Technology
South China University of Technology
Logical alarm information is the key to mining the knowledge
that hidden in the power system equipment operation and
maintenance information. In this paper, a knowledge mining
method of association rules based on ontology is proposed in
order to realize the intelligent analysis of substation alarm
information. Firstly, the alarm information ontology is based
on the structure of substation configuration language, and it
uses the methods of short text classification and data generali-
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zation, which lays the foundation for hierarchical database of
the Apriori algorithm. Secondly, this paper uses the ontology
method to construct ontology class tree that integrates the unstructured records based on three dimensions of time, frequency and range. And then we traverse data, attributes, and
relationships in the tree, so as to generate the data sources that
computer can use for algorithms in data mining. Finally we use
the improved Apriori algorithms based on alarm ontology to
calculate and draw conclusions. Experimental results show
that the efficient generation of association rules and assertions
rules verify the validity of the method.
method (PDIPM). This new OPF model is constituted of current source converter (CSC), VSC and its coupling transformer which is considered to be a tap-changing transformer. The
new model represents well both AC system and DC system
where the VSC is not assumed as idealized, controllable voltage
sources but compound transformer devices which take account
of VSC internal switching losses, ohmic losses and reactive
power design limits. Finally, the accuracy and effectiveness of
the proposed OPF model are demonstrated on a modified
IEEE-14 Bus system.
TuE02.2
TuE01.5
DC Side Line-to-line Fault Analysis of VSC-HVDC
and DC-fault-clearing Methods
pp. 2395-2399
Relay Adaptive Testing Research in Smart Substation Process Level Based on EPON Network
pp. 2383-2388
Zhihua Zhan
China Electric Power Research Institute
Zhengguang Chen
China Electric Power Research Institute
Rongrong Zhan
China Electric Power Research Institute
Chunxia Zhou
China Electric Power Research Institute
Danhua Liu
TuE02.1
A Novel Hybrid MTDC Model for Optimal Power
Flow Using Interior-Point Method
pp. 2389-2394
Hohai University
Hohai University
Guoqiang Sun
Hohai University
Qun Li
State Grid Jiangsu Electric Power Company
Jiankun Liu
State Grid Jiangsu Electric Power Company
Tongzhen Wei
Chinese Academy of Sciences
Qunhai Huo
Chinese Academy of Sciences
Lixin Wu
Chinese Academy of Sciences
As the fault voltage and current change raptly in case of DC
side line-to-line fault of voltage source converter, it's a serious
threat to the whole system. Aiming at this problem, the mechanism of DC side line-to-line fault in three kinds of converters
including two-level converter, three-level diode-clamped converter and Modular Multilevel Converter, was analyzed firstly.
Without converter blocked， the calculation of fault overcurrent and voltage collapse expressions was proposed as well.
Finally, theoretical analysis of the short-circuit fault process
was validated through the RT-LAB simulation. The derivation
and simulation waveform provide a reference for disconnecting the faulty branch. The results indicate that quick removal
of the fault is better to be done by DC circuit breaker or converter with self-clearing. A low-voltage low-current laboratory
prototype of hybrid DC circuit breaker has been built in the
laboratory, which verify DC circuit breaker can disconnect the
fault current absolutely.
Through describe the principles and characteristics of EPON
network, Proposed EPON communications network applying
smart substation process level, and test the adaptability of
protection under the EPON network. The paper has constructed smart substation relay protection dynamic simulation
model test platform based on EPON network. Selecting 220kV
smart substation busbar protection, transformer protection,
line protection for test object, and analyzed the test results.
The result shows that relay protection operation performance
has not affected by the process layer by using EPON network.
The research work can provide the basis for the smart substation layer applying EPON network and the subsequent technology Application.
Weimin Huang
Zhinong Wei
University of Chinese Academy of Sciences
TuE02.3
Accelerated Model of Alternate Arm Voltage
Source Converters
pp. 2400-2404
Original optimal power flow (OPF) model of hybrid multi-terminal high voltage direct current (hybrid MTDC) system
ignores the converter transformer of voltage source converter
(VSC). The modulation of VSC may reach the upper limit losing regulation and VSC station works in the nonlinear modulation area. This paper presents a novel model of hybrid
MTDC for OPF solutions using primal-dual interior-point
Wenlong Liu
Chinese Academy of Sciences
Jin Zhu
Chinese Academy of Sciences
Qunhai Huo
Chinese Academy of Sciences
Tongzhen Wei
Chinese Academy of Sciences
For the purpose of drastically reducing the computational time
of alternate arm voltage source converters in electromagnetic
transient simulations, an accelerated model of AAMC is proposed based on Thevenin's theorem. This real-time simula-
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tion model is fast and efficient, and it has strong universality.
The simulation results validate the simulation accuracy and
acceleration ratio of the new model.
TuE02.6
A Study on Damping Low Frequency Oscillation
in Power System by VSC-HVDC
pp. 2415-2419
TuE02.4
Analysis of Oscillation Modes in A VSC-HVDC
System
pp. 2405-2410
Shan Jiang
Changsha University of Science and Technology
Xin Tang
Changsha University of Science and Technology
Mao Xiao
Changsha University of Science and Technology
Xin Tang
Changsha University of Science and Technology
The low frequency oscillation occurs in power system is mainly
due to the insufficiency of the system damping. A voltage
source converter based high voltage direct current
(VSC-HVDC) system with traditional control strategy can not
supply damping. To increase the system damping, two damping control strategies for a VSC-HVDC by modulating the
active and the reactive power respectively are proposed. Then
the VSC-HVDC with the proposed control strategy connected
Harmonic instability may occur when a controlled voltage
source converter interacts with the local power grid in a power
system. In this paper, oscillation modes are analyzed in a voltage source converter based high voltage direct current
(VSC-HVDC) system. The impedance models that are seen
from the point of common coupling (PCC) for the rectifier ac
system are also derived. The output impedance models consider the parameters of the inner current control loop and the
outer power control loop. The obtained impedance models are
then used to analysis the oscillation modes of the system. Simulation is built in the time-domain program (PSCAD/EMTDC)
and the results validate the analysis.
with a single-machine infinite-bus system is analyzed theoretically. Finally, based on the PSCAD / EMTDC simulation software, the simulation platform of the system is established and
the simulation results show that both two kinds of damping
control strategies can increase the system damping effectively,
suppress the low frequency oscillation rapidly, and enhance the
stability of power system.
TuE03.1
TuE02.5
A Review of Different UPFC Steady Models in
Power Flow Algorithm
pp. 2420-2424
DC-side Small-signal Model of a PWM Converter
W ith a DC Voltage Controller
pp. 2411-2414
WeiTan
Changsha University of Science and Technology
XinTang
Changsha University of Science and Technology
Ningyu Zhang Jiangsu Electric Power Company Research Inst
Jiankun Liu
Compared to AC distribution network, DC distribution network has a significant technical and economic advantages in
the new energy grid connect, power supply to the load driven
by converters and transmission loss. DC distribution network
usually connects with AC grid by PWM inverter, thus establishing the DC side model of the PWM converter station is very
important. In this paper, the fixed DC voltage control model of
the converters is presented and the active balance equation is
linearized, then the DC side Small-signal model is built. Furthermore, the DC-side input impedance of the converter can be
constructed by a resistor in parallel with an inductor. The circuit model is useful not only for analyzing the DC micro-grid’s
stability, dynamic and static characteristics but also for analyzing and designing the parameters of the DC circuit in new
energy generation systems. Finally, the PSCAD simulation
results show the effectiveness of the proposed equivalent circuit
model.
November 26-29，2015 Changsha，China
Jiangsu Electric Power Company Research Inst
Qian Zhou
Jiangsu Electric Power Company Research Inst
Haoming Hu
Jiangsu Electric Power Company Research Inst
Chen Jing
Jiangsu Electric Power Company Research Inst
Haiyun An Jiangsu Electric Power Company Research Ins
As the most powerful FACTS (flexible alternative current
transmission systems) device, UPFC (unified power flow controller) could be considered as a multi-function controller
which is capable of providing the performance of one or two
FACTS device. This paper presents various UPFC steady
models in load flow algorithms. Based on acquired achievement, UPFC has been researched by load injection technique,
decoupled technique, π load injection technique, indirect technique, ideal transformer technique for different analysis purpose. It also discusses advantages and disadvantages of each
method. In the end, based on analyzing current methods, a
discussion for future is proposed.
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has taken the use of the principle of multi-resolution structural
elements to complete feature extraction by choosing different
kinds of linear structure element. By the simulation experiment, compared with the fault feature component extracted by
wavelet transform, it shows that this measures has a good effect on the fault feature extraction of single phase grounding
fault in neutral ineffective grounding system.
TuE04.1
Comparison Study on Restoration Strategies of
Chongqing Power Grid
pp. 2425-2430
Tao Chen
Chongqing Electric Power Corporation
Li Feng
Chongqing Electric Power Corporation
Xinyu Liu
Chongqing Electric Power Corporation
Lin Zhang
Chongqing Electric Power Corporation
Lingyun Tao
Beijing Jiaotong University
Ying Wang
Beijing Jiaotong University
Pei Zhang
TuE04.3
Study of The Disturbance Propagation in The
Discrete Model of Power Networks
pp. 2436-2441
Beijing Jiaotong University
The efficient restoration after large-scale electric interruption
is an important subject for ensuring the secure operation of
power systems. This paper applies the concept of “generic restoration milestones (GRMs)” to develop two different restoration strategies of Chongqing power system. One adopts
build-outward approach that utilizes internal hydropower as
black-start units. Another adopts build-inward approach that
utilizes external power source as black-start units. Comparison
study results show that the build-inward strategy uses less time
than the build-outward strategy, thereby promotes the process
of restoration. It can assist system operators in selecting an
optimal restoration plan.
Haihan
Li North China Electric Power University Baoding
State Grid Zhengzhou Power Supply Company
Hui Zhang
State Grid Zhengzhou Power Supply Company
Bing Liu
State Grid Zhengzhou Power Supply Company
State Grid Zhengzhou Power Supply Company
Zhengzhou Xinli Electric Power Co.,Ltd
The study of the characteristics of disturbance propagation in
the interconnected power networks is of great importance to
control the spreading of disturbance and improve the security
level of power systems. In this paper, the characteristics of
disturbance propagation in a one-dimensional chained power
network are studied from the electromechanical wave point of
view. The electromechanical wave equation is built based on
the discrete inertia model of power networks. The wave transfer function which can describe the variations of amplitude
and the phase is derived. Then, the propagation characteristics
of different frequency disturbances are analyzed. The corner
frequency of the discrete inertia model is proposed. Furthermore, the frequency dispersion and local oscillation are considered and their relationships with the corner frequency are
revealed as well. Computer simulations for a 50 generators
chained network are carried out to verify the propagation
characteristics of disturbances with different frequencies.
North China Electric Power University Baoding
North China Electric Power University Baoding
Wei Bao
Lu Xin
Improved Mathematical Morphology Transformation and Application to Single Ground Fault
Feature Extraction in Small Current System
pp. 2431-2435
Qiang Li
State Grid Zhengzhou Power Supply Company
Jun Xin
TuE04.2
Guping Zheng
Yuehao Yan
TuE05.1
Single phase grounding fault occurs in small current grounding power system frequently, fault signal caused by which contains a large number of feature information, which is an important basis for the fault location. However, due to the weakness of the fault signal, collecting the fault feature information
becomes a difficult point to detect the fault line and solve the
fault location. In this paper, combining with the idea of multi-resolution structural elements, an improved mathematical
morphology method to accomplish the extraction of the characteristics of the fault signal has been proposed. Firstly, the
consistency distribution level has been introduced to ameliorate the traditional morphological filter, which reassigned the
individual treatment effect of the signal of Open-Closing and
Close-Opening operation and optimized the proportional coefficients of these two kinds of operations in this filter. As a result,
it makes these two operations have a more thorough and effective influence on the feature signal extraction results. Then, it
Analysis on the Measures Employed to Deal with
Abnormal Faults of Intelligent Electric Meters
pp. 2442-2446
Ke Wang
Central South University
Rui Huang
Hunan Electric Power Company
Hao Chen
Hunan Electric Power Company
Haiyuan Wang
Hunan Electric Power Company
Xianyong Xu
Hunan Electric Power Company
Liman Shen
Hunan Electric Power Company
All kinds of faults would occur during the operation of the
intelligent electric meter including burnt-out electric meter;
black screen; voltage loss; communication fault; battery fault;
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display malfunction and relay malfunction. In this paper, two
kinds of abnormal faults encountered by the author during
work are listed for research and analysis so as to propose
measures for dealing with these two kinds of faults as well as
provide useful suggestions for future work.
tion and maintenance of power grid. To weaken the influence
above, the technology named Vehicle to Home is proposed,
which can control EV charging load to a specific value as well
as control the EV discharge to grid. In order to actively respond to the impact of EV and distributed PV application access to the power grid, based on the actual home users, the
data of household electricity load and the user level transformer are collected and analyzed. At the same time with the
peak and valley price, based on the quantitative analysis of the
influence of electric cars, solar access to the grid, the interactive applications is put forward. Calculation and interactive
analysis results show that the implementation of V2H can not
only bring economic benefits to users but also reduce the peak
valley ratio and the risk of peak on peak which result on the
electric vehicle charging in disorder.
TuE05.2
Research on Active Demand Response Based on
Multi-agent Simulation
pp. 2447-2453
Na Yu
Northeast Dianli University
Lezheng Yu
Northeast Dianli University
In view of the characteristics of active demandresponse, a multi-agent simulation system of active demand response behavior
is proposed in the paper. We take reside-nt user as an example,
a multi-agent simulation system an-d the interaction mechanism contains two kinds of scheduli-ng with electrical equipment is designed. Taking electricity cost minimum as the goal,
electricity plan decision mode is established according to operation characteristics of each ki-nd electric equipment and considering the price signals and the user electricity habit; in order to avoid the “rebound peak”, the indicator variables to
evaluate the active demandresponse behavior are proposed,
taking the maximum powerlimitation as demand response
signal and formulating real-ti-me adjustment rules. Taking a
residential user as a case, we analyze their participation in
active demand response inelectricity plan decision and real-time adjustment and studie-s the influence of electricity
usage satisfaction on the use o-f electricity and evaluation indexes. The rationality of the proposed model and method are
verified.
TuE05.4
Research on Integrated Utilization of Multi-resources Energy in Intelligent Building DC
Microgrid Based on OpenADR
pp. 2459-2464
XiangtanUniversity
Minghui Fan,
XiangtanUniversity
Jijun Li
Genping Wang
XiangtanUniversity
Shenzhen Polytechnic
In distributed energy hybrid power system of intelligent
building , Multi-input DC/DC converter has many advantages ,simplifying the dynamic interface to the system for
distributed power and playing voltage Boostor Buck more effectively in the system. Based on OpenADR communication
protocol and according to electricity prices, the system load
can be adjusted by the intelligent controller for the economic
optimal goal. Besides, an intelligent building DC Micro-grid
simulation in which the Wind-PV-diesel battery hybrid power
system also realized will be presented so as to increase accesses
of distributed energy.
TuE05.3
Study on the Impacts and Analysis of EV and PV
Integration Into Power Systems
pp. 2454-2458
Cheng Gong
Lingzhi Yi
State Grid Beijing Power Research Institute
Longfei Ma
State Grid Beijing Power Research Institute
Zhongjun Chi
State Grid Beijing Power Research Institute
Baoqun Zhang
State Grid Beijing Power Research Institute
Rui Shi
State Grid Beijing Power Research Institute
Ran Jiao
State Grid Beijing Power Research Institute
Shuang Zeng
State Grid Beijing Power Research Institute
Jianshu Chen
State Grid Beijing Power Research Institute
TuE05.5
Multi-objective K inetic-molecular Theory Optimization Algorithm W ith Application to Automatic Demand Response
pp. 2465-2470
Lingzhi Yi
Shengbing Li
Chaodong Fan
Yahui Wang
EV (Electric vehicle) and PV (photovoltaic) load will bring
about some influence to the power system when is connected to
gird, such as the change of load characteristics, increase the
peak valley difference and etc. At the same time the application
of inverter will bring about reverse power threat to the opera-
November 26-29，2015 Changsha，China
Xiangtan University
Xiangtan University
Xiangtan University
Hunan University
Intelligent household as an extension of smart grid in the user
side highly integrates loads management and control. Home
energy management system (HEMS) with automatic demand
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response (ADR) is a key part of intelligent household, which is
able to fit their electricity demand without changing the residents' habits too much. Furthermore HEMS schedule their
power consumption to save energy, reduce emission, shift peak
load and reduce the financial burden. The characteristics of
various electrical devices were analyzed in this paper, and a
mathematical model of ADR was established. Multi-objective
kinetic-molecular theory optimization algorithm was used to
optimize the solution of the ADR model. Implementation results showed that the KMTOA was more accurate and reliable
than other algorithms for the complexities of model and data
size considered in this study. Compared with some similar algorithms, the multi-objective kinetic-molecular theory optimization algorithm shows more advantages.
Research of Electricity Stealing Identification
Method for Distributed PV Based on the Least
Squares Approach
pp. 2471-2474
Nanjing Univ of Science and Technology
Xiaodong Yuan
Jiangsu Electric Power Company
Min-gming Shi
Jiangsu Electric Power Company
State Power Smart Grid Research Institute
Zhansheng Hou
State Power Smart Grid Research Institute
Min Xu
State Power Smart Grid Research Institute
As unified communications systems used in the power industry
that has special security requirements on the communications
industry, the security issues in urgent need. Security issues
through the analysis of a typical unified communications system, the communication level, combined with the complex
network environment in the power industry, power industry
security requirements for unified communications. Reference
to domestic and foreign advanced communications security
technology and unified communications security issues and the
special needs of the power industry, from hardware, software
and other aspects, this paper presents unified communications
security solutions for the power industry transformer and
temperature.
TuE06.1
Zhengyang Sun
Wang Gang
TuE07.1
Bi-level Distributed Optimal Dispatch of Micro
Gird Clusters Based on Mutual Communication
pp. 2480-2485
Jie Yu
Southeast University
Yiping Jiao
With the photovoltaic (PV) subsidy policy of China, the installed capacity of distributed PV is increasing rapidly. However, as the amount of subsidy is in proportion to PV power
generation, few dishonest users take some methods to increase
the value of PV meter and get extra subsidy. These behaviors
are called electricity stealing of PV. This paper introduces four
typical methods of electricity stealing of PV and proposes an
electricity stealing identification method using measured value
of PV meter and gate meter. The least squares approach is
adopted to fit the linear functions between PV meter data and
gate meter data of electricity stealing model and
none-electricity stealing model. The slopes of the two linear
functions are different, which can be used to identify the behavior of electricity stealing. Finally, simulations are performed, and the results show that the method based on the
least squares approach can identify the stealing behavior effectively if the solar array simulator is used.
Southeast University
Xiaolong Wang
Ming Ni
Southeast University
NARI Technology Co. Ltd
Micro Gird Cluster (MGC), connecting to the medium or low
voltage distribution network, usually contains certain number
of Micro Grids, distributed generators, energy storages and
loads. Considering coordinated operation in MGC, this paper
proposes a hierarchical control architecture- the upper layer
operated in distributed mode among multiple MGs and the
lower layer were controlled by each micro grid center. This
hierarchical architecture not only shows the excellent features
of distributed control, but also integrates the advantages of
centralized control. According to this hierarchical architecture,
bi-level distributed optimal dispatch of MGC is analyzed. With
the aim of minimizing MGC total costs in upper layer and
minimizing each Micro-Grid costs in lower layer, bi-level op-
TuE06.2
timal mathematic model take global and local aims into account synthetically. The distributed primal-dual sub-gradient
Research on the Security of Unified Communications System’s Applications in the Power System
pp. 2475-2479
Liang Zhu
State Power Smart Grid Research Institute
Lin Peng
State Power Smart Grid Research Institute
Haiyun Han
State Power Smart Grid Research Institute
Xingchuan Bao
State Power Smart Grid Research Institute
algorithm is designed to solve the upper layer optimal model,
alternating gradient iteration algorithm for the lower optimization model. Simulation cases show that bi-level distributed
optimal mathematic model successfully fulfill the aim of coordinated operation in MGC, and distributed primal-dual
sub-gradient algorithm is an effective solution to this optimal
model.
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TuE07.2
TuE07.4
Fast Calculation of Available Transfer Capability
Incorporating Uncertainty of W ind Generation
pp. 2486-2490
Yunfei Chu
Hohai University
Zhinong Wei
Hohai University
Guoqiang Sun
Hohai University
Yichi Li
Research on Reliability Evaluation Model and
Path Optimization for Power Communication
Network
pp. 2495-2500
Yunfei Guo
Ming Xu
Hohai University
power system derived from intermittent and randomness of
wind speed, which has impact on calculation of power system
index such as ATC. In this paper, a probabilistic ATC calculation model containing doubly fed induction generator is proposed. Then, a fast ATC calculation method based on UT technique is proposed, which has proved to be efficient with a high
accuracy, and it is convenient to deal with correlations among
input variables. Finally, effectiveness and practicality of the
proposed method are verified with test examples of IEEE-30
system.
TuE07.3
Researches on Data Processing and Data Preventing Technologies in the Environment of Big
Data in Power System
pp. 2491-2494
State Grid Smart Grid Research Institute
Min Xu
State Grid Smart Grid Research Institute
Wantian Cao
State Grid Smart Grid Research Institute
Peng Gao
Pactera Technology International Ltd
Article based on the topological structure of power optical
communication system, analyzes the main factors that affect
the reliability of optical transmission equipment and optical
fiber links, and consider the bearer of the electric power business of importance weights. At the same time, a kind of electric
power communication business route evaluation model and
risk calculation method is proposed, the communication risk
probability of power business can be early warning based on
the proposed method, and through the GMPLS dynamic routing constraint algorithm with time delay parameters, the traffic channel of the communication risk is optimized. So preventive measures can be taken in advance to reduce the risk of
power business interruption. Finally according to the topological structure of Subei stable system as an example, the business risk path simulation and verification calculation and risk
aversion can be carried through the defense system of power
communication security. This method can automatically determine the business risk and realize path rerouting automatically through business communication network dynamic routing constraint algorithm to avoid the risk in advance, but also
can provide important reference for the development of the
security and stability of power grid strategy.
Wind power has brought about many uncertain factors to
Nige Li
State Grid Smart Grid Research Institute
TuE07.5
Dynamic Partitioning Technology Based on Trend
Information of Bulk Power System
pp. 2501-2505
State Grid Smart Grid Research Institute
In this paper, we mainly focus on the problems of the data
Yi Tang
Southeast University
Lei Shi
Southeast University
processing and data security in the environment of the elec-
Mingming Cai,
Southeast University
tricity big data systems. Firstly, we focused on the security of
Feng Li
Southeast University
big data storage, as well as the big data applications, including
Dengfeng Li
Chongqing Power Corporation
Guoping Liu
Chongqing Power Corporation
the classification, aggregation and data mining demands. We
proposed several practicable schemes to the big data applica-
Xiancheng Ren
tions. After that, we studied on the problem of the privacy
prevention in big data processing. In this paper, we analyzed
Trend information of the bulk power system reflects the operating status of the power grid and could be utilized to predict
the threats to the security and stability. A new technology
called dynamic partitioning is proposed to increase the power
system’s stability based on the trend information in this paper.
Firstly, the emergency state of power system is identified according to some trend information, which is related to some
the demands of the big data privacy prevention in smart grid,
and also proposed several methods. Based on the previous researches, we put forward the outline of the research hotspots
for the data protection.
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State Grid Electric Power Research Institute
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factors such as equipment overload, voltage over-limit, low
frequency oscillation, short-circuit current over-limit and so on.
Then some control methods could be used as dynamic partitioning technologies to prevent stability problem under the
emergency condition, including transferring load, switching
standby lines, changing the operation mode of electromagnetic
looped network and so on. Finally, auxiliary decision-making
strategy is proposed to specify which dynamic partitioning
scheme should be selected among the optional solution space.
The simulation results illustrate the effectiveness and rationality of the proposed method.
communication delay on current differential protection with a
probabilistic method, and a false-trip probability model is
proposed. First, the mechanism of false-trip of current differential protection is introduced and the quantitative relationship between differential current and power grid operation
state and communication delay is derived. Then a false-trip
probability model based on current differential protection
action criterion is proposed with a probabilistic method. Simulations show the validity of the model. Based on the false-trip
probability model, the key factors affecting false-trip of current differential protection are analyzed, and some useful conclusions are drawn transformer and temperature.
TuE07.6
TuE07.8
Study of the Evaluation and Design Method for
the Control Structure of Power System Stability
Control System
pp. 2506-2511
Yuhang Liu
Model the Real-time Failure Rate of Protection
Channels Due to Communication Latency and Bit
Error
pp. 2517-2522
NARI Technology Co. Ltd
Ming Ni
NARI Technology Co. Ltd
Zhou Li
NARI Technology Co. Ltd
Wenjie
Yu NARI Technology Co. Ltd
Manli Li
Ming Ni
The regional security and stability control system is an important tool to ensure the safe and stable operation of modern
power system. The communication system can provide information exchange among the stations for the regional security
and stability control. Hence, the reliability of communication
system is one of the important factors that need to be considered in the design of the control system. In this paper, firstly,
the regional security and stability control system is divided into
centralized control structure and distributed control structure
using the decision-making method. Secondly, the evaluation
index of the communication status for the control system is
given. Thirdly, the differences of the communication networks
based on centralized control and distributed control structure
are analyzed comparatively. And finally, the design method of
the control system based on centralized control as well as distributed control structure is proposed.
NARI Technology Co. Ltd
NARI Technology Co. Ltd
Yi Tang
Southeast University
Jie Wu
Nanjing University of Posts and Telecommunications
Yingjun Wu
Nanjing University of Posts and Tele
The safe and reliable transmission of relay protection signal is
essential to the normal operation of relay protection device.
Based on the characteristics of the protection signal transmission, this paper proposes a method to model the real-time failure rate of the protection communication channel introduced
by the communication latency and bit error. First of all, by
using the decision tree method and processing the history fault
data of the protection channels, communication equipment,
board equipment and various function blocks, get the channel
failure rate based on historical data. On this basis, according
to protect channel signal delay and error performance requirements for the protection signal, propose a real-time
channel failure rate model due to communication time delay
and bit error. Finally, the application and effectiveness of the
proposed channels real-time failure rate model are demonstrated on a typical example.
TuE07.7
TuE07.9
False-tirp probability model for the current differential protection considering power grid operation state and communication delay
pp. 2512-2516
The Achieve of Power Manager Application
Honeypot Based on Sandbox
pp. 2523-2527
ManliLi
NARI Technology Co. Ltd.
MingNi
NARI Technology Co. Ltd.
YuecenLi
NARI Technology Co. Ltd.
YiTang
Southeast University
YingjunWu Nanjing Univ of Posts and Telecommunications
Qian Guo
Jie Fan
Nige Li
State Grid Smart Grid Research Inst.
State Grid Smart Grid Research Inst.
State Grid Smart Grid Research Inst.
Honeypot is a common method of attack capture, can maximize the reduction of cyber-attacks. However, its limited application layer simulation makes it impossible to use effectively in
power system. Through research on sandboxing technology,
The paper studies the impact of power grid operation state and
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this article implements the simulated power manager applications by packaging real power manager applications, in order
to expand the honeypot applied range.
ony algorithm to find the optimal circuitous route. Simulation
results show that the method is fast, which can accelerate the
recovery of the communication network. Besides, this paper
does some research on the dead end problem, and analyses
relationship between degree of adjacency and ratio of coming
to a dead end. The result shows that the efficiency of ant colony
algorithm can be improved only if it tries to avoid coming to
dead ends.
TuE07.10
Novel AGC Strategy Considering Communication
Failure Possibility for Interconnected Power
Grids
pp. 2528-2531
Zhou Li
Southeastern Univ.
Jie Yu
Southeastern Univ.
Haoyu Qi
Ming Ni
TuE07.12
Research and Application of Interactive Technology between Microgrid and Distribution Grid
pp. 2536-2538
Nanjing University of Science and Tech.
Xiaohui Xu
NARI Technology Inc.
The conventional automatic generation control (AGC) strategy
only takes the economic factors into consideration. However,
for interconnected power grids, under the condition of communication failure, there will be high risk that the AGC control signal be blocked and then some AGC units will not adjust
the generating power following the load fluctuation due to the
interrupt of the control signal. In this paper, the strategy of
economic dispatch (ED) as well as load frequency control (LFC)
has been investigated and a novel AGC strategy considering
the communication failure possibility has been proposed. The
ED control of the novel AGC strategy is designed to drains the
power margin of those AGC units with high risk of communication failure according to the load forecasting and the evaluation of communication system. While the LFC strategy of the
novel AGC strategy is designed to employ those AGC units
with low risk of communication failure to balance the unpredictable short-term load fluctuation. As a result, the communication failure would cause slightest affect to AGC. The IEEE
118-bus benchmark system is employed to verify the effectiveness of the novel AGC strategy, and the simulation results indicate that, the novel control strategy can improve the dynamic
performance, stability as well as economic performance of
AGC under the condition of communication failure. It has
excellent economy and engineering application value.
The China Electric Power Research Inst.
Hao Ding
State Grid Ningxia Electric Power Company
Longyu Yang
State Grid Ningxia Electric Power Company
Tiantian Wu
School of Southeast Univ.
Based on 330kWp Yinchuan solar power station, the overall
framework of interactive microgrid was firstly designed. Then
subsystems including microgird monitoring system and energy
storage system were constructed. According to our interactive
microgrid system, the output and operation mode of the photovoltaic and energy storage system can be adjusted through
the energy management system to smooth the output curve of
photovoltaic and supply power for station load at off-grid status. The wireless communication based on GPRS is used between interactive devices (including isolation devices) and the
Ningxia electric power company. Finally, through constructing
and upgrading necessary facilities, the microgird demonstration project was built, which provided a good platform for the
study of microgrid and the practice interactive test with distribution grid. The renewable energy and loads can be integrated as much as possible into the platform. Meanwhile, the
platform shows excellent energy-saving characteristics due to
the use of electric load, which greatly reduce the energy losses
in the testing process.
TuE07.13
TuE07.11
Reliability Assessment of Line Protection Based
on Reliability Graphs and Monte Carlo Simulat i on
pp. 2539-2544
Analysis of Ant Colony Algorithm for F inding the
Optimal Circuitous Route in the Communication
Network of Power System
pp. 2532-2535
Xin Chen
Zhiqian Bo
Yingjun Wu
Nanjing Univ. of Posts and Tele.
Tsinghua Univ.
Manli Li
NARI Technology Inc.
Xuji Group Corporation
Ming Ni
NARI Technology Inc.
Xinzhou Dong
Tsinghua Univ.
Shenxing Shi
Tsinghua Univ.
Qiang Zhang
A reliability assessment methodology for transmission line
protection systems is presented, which is based on a probabilistic modeling of the protection system’s successful operation,
The communication network of power system is often damaged
after a disaster. To solve this problem, this paper uses ant col-
November 26-29，2015 Changsha，China
State Grid Huaian Power Supply Company
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tablished; information entropy theory has been introduced to
weigh the comprehensive impact of these six meteorological
factors in real-time objectively and quantitatively; linear penalty function has been used in amending meteorological entropy value to define comprehensive meteorological factors, which
can quantify the influence weather risk sources have on dispatching operation. Finally, the model's validity is verified
based on the practical calculation of Guangzhou City, the result showing the model can reflect the actual weather situation
of the devices in the being operated area and accurately assess
the potential risk which multiple meteorological factors have
on power grid dispatching operation. Through the joint between the model and numerical weather prediction, automation level of risk sources identification in power grid dispatching operation is enhanced greatly. So far, the model has been
put in use in Guangdong Power Grid.
and considering both the availabilities of the line protection
hardware and the failure function of the current differential
protection caused by communication delay. The system successful operation is described by reliability graphs, and solutions are obtained from Monte Carlo simulation. The developed methodology is applied to three protection schemes to
show its effectiveness.
TuE07.14
Z igBee W ireless Networking for the Intelligent
Protection Center Research
pp. 2545-2548
Fanfan Ding
Zhiqian Bo
Dahai Zhang
Tsinghua Univ.
Xuji Group Corporation
TuE07.16
Beijing Jiaotong Univ.
Xin Chen
Tsinghua Univ.
Xinzhou Dong
Tsinghua Univ.
Shenxing Shi
Tsinghua Univ.
Communication Channel Reconstruction Based
on W ireless Sensor Network for Pilot Differential Protection
pp. 2554-2560
This paper introduces the basic structure and functions of the
Intelligent Protection Center, and besides, it describes rapid
reconstruction of power grid and rapid recovery of communication channel, both based on the Intelligent Protection Center.
In this paper, we have compared the characteristics of various
wireless communication modes and discussed unique advantages of ZigBee technology in reconstructing of power system after disaster. We intentionally proposed the rebuilding of
the wireless channel based on the ZigBee technology for "information island" where there was not any circuitous channel
around, and have carried out the simulation about this project.
Entropy Theory Based Weather Risk Source
Quantified Model for Power Grid Dispatching
pp. 2549-2553
Guangdong Power Grid Co., Ltd
Zhu Chao
Guangdong Power Grid Co., Ltd
Huazan Zhong
Guangdong Power Grid Co., Ltd
Min Xie
South China University of Tech.
Yijiang Yin
South China University of Tech.
Mingbo Liu
South China University of Tech.
Hunan Province Power Company of State Grid
Liqiang Xu
Hunan Province Power Company of State Grid
Xu Chen
Huazhong University of Science and Tech.
Xianggen Yin
Huazhong University of Science and Tech.
Bin Yu
Huazhong University of Science and Tech.
This paper discusses communication channel reconstruction
based on wireless sensor network for pilot differential protection. Considering communication characteristic of WSN module, this paper further studies and analyzes redundant arrangement and communication performance under hazard
from the perspective of practical application. A redundant
arrangement algorithm of nodes based on reliability and optimal cost of the whole communication network is proposed.
And the influence of communication distance, line span and
hop counts to communication delay and is studied under
ADOV routine by pilot differential protection digital simulation test. The results of pilot differential digital simulation test
shows that emergency protection channel constructed by wireless sensor network which uses redundancy arrangement
method to do network panning can achieve strong reliability
and meet the need of pilot differential protection under extreme disaster.
TuE07.15
Jianing Liu
Wei Pan
Weather is one of the main risk factor in power grid dispatching operation and this paper studies how to identify and establish a model of weather risk sources during power system dispatching operation for smart grid. A qualified weather risk
sources model, which can comprehensively reflect temperature,
wind speed, visibility, rainfall, relative humidity, thunder and
lightning harm degree these six meteorological factors, is es-
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(ESS) PI controllers’ parameters. The performance of ESS
active and reactive power PI controllers is very important in
applying ESS to improve power systems stability in smart grid
in which the ESS is required to adjust its active and reactive
power quickly. Therefore，an improved PSO algorithm with
the idea of the simulated annealing algorithm is applied to
optimize the ESS active and reactive power PI controllers’
parameters. On the basis of PSO with chaotic initialization,
iteration by adding chaos disturbance and adaptive inertia
weight factor, the algorithm becomes more efficient because of
both location limits and step out locally optimal solution by
adding the idea of the simulated annealing. The nonlinear simulation results test and verify the effectiveness of optimization
by a 4-machine power system installed an ESS with optimization PI controllers.
F: Energy Internet and New Emerging Technologies
TuF01.1
Analysis of Technical Strategies Towards a Low
Carbon Electricity System in Europe
pp. 2561-2565
Yue Zhang
Xi,an Jiaotong Univ.
Xiuli Wang
Xi,an Jiaotong Univ.
Wentao Zhang
Xi,an Jiaotong Univ.
Furui Hou
Xi,an Jiaotong Univ.
Zechen Wu
Xi,an Jiaotong Univ.
Facing energy crisis and climate changes, transition towards a
low carbon electricity system has aroused great concern
around the world. As pioneer in CO2 emission reduction, European Union (EU) is planning all-round transformation in
electricity system. This paper analyses and concludes European decarbonization strategies from four aspects, with the aim
to explore approaches to a low carbon electricity system. At
generation level, exploitation of large scale renewable energy
sources (RES) is the key to a low carbon energy supply. At
transmission level, a pan-European transmission grid is essential for the integration and transportation of RES across Europe. At consumption level, great importance will be attached
to demand response (DR) to reduce supply variability. At
technology level, promising breakthrough technologies are
summarized. Inspired by European plans, the paper ends by
providing suggestions for a future low carbon electricity system in China.
TuF01.3
A Daily Operation Arrangement and Peak Load
Regulation Algorithm Based on Multi-state Renewable Energy Simulation
pp. 2571-2575
Optimization of ESS PI Controllers Parameters Based on PSO in Smart Grid
pp. 2566-2570
Hohai Univ.
Chenyu Zhao
Hohai Univ.
Feng Wu
Hohai Univ.
Hongying Zhao
Jiangsu Electric Power Research Inst.
Jingjing Shi
Jiangsu Electric Power Research Inst.
Xiaoxue Jiang
Jiangsu Electric Power Research Inst.
Junhua Deng
Jiangsu Electric Power Research Inst.
Yue Li
Jiangsu Electric Power Research Inst.
An improved PSO is proposed to tune Energy Storage System
November 26-29，2015 Changsha，China
Xi’an Jiaotong Univ.
Xiuli Wang
Xi’an Jiaotong Univ.
Yue Zhang
Xi’an Jiaotong Univ.
Zechen Wu
Xi’an Jiaotong Univ.
Furui Hou
Xi’an Jiaotong Univ.
Large-scale integration of wind power makes the peak load
regulation become more and more serious. As a result, the
analysis of daily operation manner plays an important role in
determining the power architecture. Based on traditional generation expansion planning method focusing on economic and
reliability indices, this paper proposes a daily operation arrangement and peak load regulation algorithm, which is established on the basis of multi-state renewable energy simulation,
and is used to test the running feasibility of the power generation planning result. The algorithm proposes a sequential multi-state wind generation model established on a Markov process with state transition matrices and initial distribution
based on historical data. Also, the algorithm proposes an efficient multi-state energy function forming method based on
equivalent energy function method to analyze the power and
energy balance and peak load regulation of the system using a
deterministic production simulation. So the algorithm can ensure the economy, reliability and feasibility of the power generation planning. Test system was used to verify the rationality
and feasibility of the proposed models and algorithm and the
results of this paper may provide some suggestions for the
generation planning.
TuF01.2
Linjun Shi
Wentao Zhang
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TuF01.4
TuF01.6
Load Prediction for Large-Scaled HAWT Based on
a Nonlinear Structural-Aerodynamic Coupled
Method
pp. 2576-2580
Sustainable value analysis of smart grid and a
prospective case study of China grid 2020
pp. 2587-2590
Hongyu Lin
Harbin Institute of Tech.
Pin Lyu
Northwestern Polytechnical Univ.
Bo Yu
Harbin Institute of Tech.
Mingfu Liao
Northwestern Polytechnical Univ.
Bo He
State Grid Energy Research Inst.
Yaojie Yin
Northwestern Polytechnical Univ.
Han Huang
State Grid Energy Research Inst.
Load prediction is becoming difficult due to the larger, lighter
and more flexible blades of large-scaled horizontal axis wind
turbine (HAWT), which leads to the nonlinear aeroelastic responses. Based on geometrically exact beam (GEB) theory
for blade structural dynamics, a free-vortex wake (FVW)
model for the prediction of unsteady aerodynamic loads and a
partitioned loosely coupled methodology to exchange the data
at the interface, a nonlinear FSI model has been developed in
this study. Through comparison of NREL UAE Phase VI experimental data and the load predicted by the nonlinear model,
the capability to accurately predict the aerodynamic loads is
validated. The nonlinear beam model is also validated by several cases which all show a good agreement with results obtained by other authors. Finally, dynamic responses for NREL
5 MW RWT are estimated and compared with results from
linear model. The results show that the coupled method is capable of evaluating blade nonlinear responses for large-scaled
HAWT.
Reduce the consumption of exhaustible natural resources is an
important feature of smart grid. By integrating power generated from renewable resources and implementing environmentally benign end-devices such as electric vehicles, smart
home appliances and etc, smart grid creates sustainability values. This article proposes a value analysis model of smart grid
from the view point of sustainable development. The EI-serafy
model is adopted to measure the user-cost of exhaustible natural resources. Then, the sustainable value of smart grid is
quantified to be the reduction of user-cost of exhaustible natural resources that consumed in power industry. A prospective
case study of China grid 2020 demonstrates that smart grid
would creates significantly sustainable value by reducing the
consumption of exhaustible natural resources.
TuF02.1
TuF01.5
Energy policy and market space research in
electricity of European Commission
pp. 2591-2595
The Dynamic Stability Analysis of W ind Turbines
under Different Control Strategies pp. 2581-2586
Yaojie Yin
Mingfu Liao
Pin Lyu
Northwestern Polytechnical Univ.
Northwestern Polytechnical Univ.
Northwestern Polytechnical Univ.
The control strategies have influences on the dynamic stability
of modern wind turbines. This article presents a theoretical
investigation on this topic. The investigation is motivated by a
vibration measurement of wind turbines in a wind farm. The
mechanisms of control strategies influencing the dynamic stability have been discussed and the stability enhancement by
means of time delay in pitch control is investigated. The results
show that the optimum control of rotational speed for maximizing energy capture below rated power can improve the dynamic stability by suppressing the axially unstable vibrations
of the wind turbines. At above rated wind speed, the control
mode of fixed-speed variable-pitch can cause unstable axial
vibrations of the wind turbines; variable-speed variable-pitch
can suppress the unstable vibrations. Additionally an appropriate time delay in pitch control can effectively enhance the
dynamic stability of wind turbines.
Fuqiang Zhang
State Grid Energy Research Inst.
Junshu Feng
State Grid Energy Research Inst.
Jianhua Bai
State Grid Energy Research Inst.
Yanming Jin
State Grid Energy Research Inst.
According to the EU's energy strategy, the future EU will reduce the size of conventional fossil fuel generation capacity,
gradually decommission nuclear power, and while vigorously
develop renewable energy. However, the EU's electricity load
will continue to grow. Due to the randomness and intermittent
of the output of renewables, and the consequent lower effective
capacity, there are needs to accept external power. Based on
the future forecasting of power load and power installed capacity change by Entso-E, market space of electricity of the
European Union (EU) and Germany were estimated. The results gave preliminary judgment of market space of electricity
for the intercontinental transmission vision between Asia and
Europe.
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TuF02.2
TuF03.1
Evidence of Significance of Graph Energy Interlinks in Topological Form of the Power Grid
pp. 2596-2602
Research on Multi-objective Optimization Coordination of Plug-in Hybrid Electric Vehicle and
Distributed Generation
pp. 2608-2613
Xin Li
Univ. of Oklahoma
Milad Javadi
Univ. of Oklahoma
Boshi Zhao
Univ. of Oklahoma
Di Wu
Univ. of Oklahoma
John N. Jiang
Univ. of Oklahoma
Huiling Li
China Electric Power Research Inst.
Chao Zheng
China Electric Power Research Inst.
Xin Zhang
China Electric Power Research Inst.
Xiang Chen
China Electric Power Research Inst.
Xiqiang Chang
State Grid Xinjiang
Graph energy is the form of energy often used in a simple sysWith large integration of plug-in hybrid electric vehicle
(PHEV) and distributed generation (DG), a good regulation
ability of the power grid is required for PHEVs random
charging and DG’s intermittency. Considering safe and economic operation of the power grid and charging cost of PHEV
owners, vehicle-to-grid (V2G) is a multi-objective and multi-constrained optimization problem by nature. A multi-objective optimization coordination model is proposed for
PHEV and DG integration. Objectives of this model are maximum synthetic load ratio, minimum node voltage deviation
and power loss ratio, lowest V2G service cost of the grid and
charging cost of PHEV owners. By dynamic regulating PHEV
charging and discharging power, power fluctuation between
load and DG can be matched well and the impact of DG intermittency on the power grid will be decreased. A real 10kV
feeder is simulated.
tem of physics, typically expressed with the potential energy in
springs and the kinetic energy of interlinked moving particles.
In this paper, we present a study to show a new piece of evidence of the significance of graph energy interlinks in topology
of the power grid, which is formed under the specific reliability
principles of power system engineering. Particularly, based on
the comparisons of the graphs, generated with a modified
graph energy based layout method,
to the physical layouts of
three real power grids, it is found that the generated graphs
are highly consistent with the actual layouts. The result is an
important piece of evidence, showing that the graph energy
interlinks play an important role in the topology formation of
the power grid.
TuF03.2
TuF02.3
Research on Quantitatively Evaluating System
Acceptance Capacity of Electric Vehicles Considering Coordinated Strategy
pp. 2614-2619
Design of A Hierarchical Infrastructure for Regional Energy Internet
pp. 2603-2607
Dan Liu Jiangsu
Electric Power Research Inst.
Xiaodong Yuan
Jiangsu Electric Power Research Inst.
Qiang Li
Jiangsu Electric Power Research Inst.
Motivated by the success of the information technologies and
new energy technology, the energy internet comes into being.
Qi Zuo
North China Electric Power Univ.
Ming Zhou
North China Electric Power Univ.
Hailei He
China Electric Power Research Inst.
Caihao Liang
China Electric Power Research Inst.
Qinyong Zhou
China Electric Power Research Inst.
Wenjie He
This paper focus on the implementation of regional energy
Beijing Hyundai Technical Centre
internet. Firstly the hierarchical architecture of regional enerBy studying on the coordination between the system reliability
level and the EV grid-integration scale, the system acceptance
capacity of EVs can be assessed from a new point of view. In
this paper, a model for the charging loads of three types of EVs
and a coordinated strategy with time-of-use price (TOU) are
established. Then, the maximum acceptable capacity, reliability sensitivity and other indicators are proposed to quantitatively characterize the system ability to accommodate EVs.
Subsequently, by combining the acquired EV charging load
gy internet is proposed, secondly the collaborative optimization
scheduling of multi-energy sources is clarified, then the
framework of energy management and public service center is
given, finally the construction of demonstration in Jiangsu is
introduced.
November 26-29，2015 Changsha，China
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algorithm with the traditional reliability assessment method,
the quantitative evaluation approach of the system acceptance
capacity of EVs considering coordinated strategy is proposed.
In order to improve the simulation efficiency, the Latin hypercube method is used to sample the system state. The feasibility
of proposed indicators and method is verified with test results
of the IEEE24-RTS system. Furthermore, different cases are
comparatively analyzed with and without the coordinated
strategy, respectively. Results prove that the coordinated
strategy can improve the system reliability level, and greatly
enhance the system acceptance capacity of EVs.
TuF03.4
Frequency Regulation Strategy for Decentralized
V2G Control
pp. 2626-2629
Lijuan Chen
Southeast Univ.
Yuxuan Jiang
Southeast Univ.
Xiangjun Li
China Electric Power Research Inst.
Liangzhong Yao
China Electric Power Research Inst.
Xiaohui Xu
China Electric Power Research Inst.
Tianxiang Geng
Vehicle-to-grid (V2G) has the potential to provide the frequency regulation service. In this paper, a frequency regulation
strategy for decentralized V2G was proposed, which not only
guaranteeing the primary and secondary frequency regulation,
but also considering the charging demands from EV customers.
According to the state of charge (SOC) of each EV, two kinds
of participation patterns were presented. One is available anytime pattern. The customers can use their EVs at any time. In
this pattern, EVs only participate in the primary frequency
regulation. Another is fixed time pattern. EVs can only be used
at a fixed time. EVs can easily switch between the primary and
secondary frequency regulation according to the current SOC.
Simulations on a two-area interconnected power system with
wind power have indicated the effectiveness of the proposed
methods.
TuF03.3
Vehicle-to-grid Participating in Frequency Regulation under Distributed Cooperative Control
Based on Cloud Service
pp. 2620-2625
Xiaolong Wang
Southeast Univ.
Jie Yu
Southeast Univ.
Jianqiang Hu
Southeast Univ.
Shumin Fei
Southeast Univ.
Jinde Cao
Southeast Univ.
State Gird Ningxia Electric Power Company
The
smart
grid
emphasizes
interaction
between
grid-load-generation, and the electric vehicle (EV) is a kind of
favorable load with controllable ability. These EVs could participate in frequency regulation when the grid is suffering from
imbalance between supply and demand. According to the requirement of power dispatching center, these EVs could inhibit
charging and postpone the electricity demand to other time. It
could also transmit electrical power to grid reversely. However,
individually frequency response of each independent EV would
cause excessive communication flows, and create new impact to
power grid. This paper based on cloud service, assembled every EV in an area into a cluster agent, and proposed a kind of
distributed cooperative control strategy to harmonize their
frequency response. Firstly, the power dispatching center issues the demand request to a leader node named cooperative
pinning node. Then, such pinning node releases the adjustment
demand to the network consisted of EV cluster agent nodes.
Through communication and calculation on each agent nodes,
the goal of fair EV load shedding would reach. Case study
shows that the method could organize multiple EV cluster
agents effectively and the system would be regulated faster
than the original system with vehicle-to-grid participating.
TuF03.5
Research And Discussion On Electric Vehicles
Charging Cable Testing Methods In Different
Standard Systems
pp. 2630-2633
Xin Li
Technology Center Nari Group Corporation
Hongsheng Xu
Technology Center Nari Group Corporation
Pan Dai
Technology Center Nari Group Corporation
Yichuan Bai
Technology Center Nari Group Corporation
Jinda Zhu
Technology Center Nari Group Corporation
Yan Chen
Jiangsu Academy of Safety Science and Technology
With the increasing use of plug-in electric vehicles (PEVs)
which has environmental and economic benefit, some institutes
have published some standards to verify the quality of electric
vehicles cables. However, these standard systems have some
differences confusing the industry manufacture and customs.
In this article, some similar and difference are founded and
discussed in order to clarify the test detail in UL and TÜV
electric vehicles charging cable standards. The test methods of
PEV cables are stated clearly to help cable industry produce
and inspect useful electric vehicles cables.
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the effectiveness of the algorithm. This algorithm can overcome the shortcoming of the particle swarm optimization
which limited to the local optimum, and realize the orderly
charging and discharging of battery charging and swapping
station, it can finally conduct the function of peak load shifting
of grid load.
TuF03.6
EV Battery SOH Diagnosis Method Based on Discrete Fréchet Distance
pp. 2634-2639
Jiao Dongsheng
Beijing Electric Power Research Inst. Beijing Electric Power Company
Wang Haiyun
TuF03.8
Beijing Electric Power Research Inst.
A Reactive Power Evaluation Model for EV
Chargers Considering Travelling Behaviors
pp. 2646-2651
Beijing Electric Power Company
The power battery of electric vehicle may be limited by battery
safety issues and power problems. The key points of this paper
are firstly it combines discrete Fréchet distance method with
discharge curve identification method, and then it proposes a
kind of new state of health diagnose method base on line testing platform. Through the CAN communication module, the
system could control the power battery to finish online full
charge and discharge test. And also the system could get the
actual operational status data to build life cycle databases of
electric vehicle, which can predict the state of health diagnose.
The results of the SOH could guide power battery safety assessment and balance maintain. Through analyzing simulation
results between the SOH diagnose results with returned test
data results, qualitative indicates the decline of EV battery.
Ting Yu
XiuPing Yao
Mingshen Wang
Yunfei Mu
Ruiye Liu
Harbin Institute of Technology
Ke Hua
Jian Meng
Key Laboratory of Smart Grid of MinKey Laboratory of Smart Grid of Ministry of Education
Xiaohong Dong
Key Laboratory of Smart Grid of Ministry of Education
A reactive power evaluation model is proposed to estimate the
available V2G capacity of reactive power provided by EV
chargers during a day considering the travelling behaviors of
EV users. Firstly, a generic EV charger model (GECM) is developed to describe the reactive power response characteristic
of EV charger. Then, considering the travelling behaviors of
EV users, a monte carlo simulation (MCS) method is implemented to build the reactive power evaluation model. Finally,
the available reactive power from EV chargers is analyzed and
compared under two different charging strategies (dumb
charging and smart charging). Simulation results show that
the reactive power evaluation model can determine the available reactive power capacity for V2G along a day, which can
support the operation of the power system.
Heilongjiang Electric Power Company State Grid Corporation of China
As the application of electric vehicles expands, their charging
power demand will influence the operation of the power grid.
This paper firstly considers the relevant factors which influence the charging power demand; by using the Monte Carlo
method to calculate the large-scale electric vehicle charging
power demand. Based on the problem that the large-scale
electric vehicle’s disordered charging may affect the stability
of the power grid, this paper considers the characteristic of the
electric vehicle battery charging and swapping station, which
can easily realize charging and discharging dispatching, taking
charging and discharging power in different periods as controlled object, taking the inhibition of load fluctuation and load
peak and offpeak difference as objective function, we can build
a mathematical model of dispatching strategy and use the multi-swarm cooperative particle swarm optimization to achieve
the daily dispatching strategy optimization. Based on the daily
load curve of a certain region, the simulation’s result verifies
November 26-29，2015 Changsha，China
Key Laboratory of Smart Grid of Min-
istry of Education
Dispatching Strategy Optimization for Orderly
Charging and Discharging of Electric Vehicle
Battery Charging and Swapping Station
pp. 2640-2645
Harbin Institute of Technology
State Grid Xinjiang Electric Power Company
istry of Education
TuF03.7
Ting Gao
China Electric Power Research Inst.
TuF03.9
A Probabilistic Evaluation Method to Voltage
Profile of Distribution Network Considering the
EV Charging Choice
pp. 2652-2657
Tong Wang
Kunda Yu Nari Technology Development Limited Company
Wei Feng
Kunda Yu Nari Technology Development
Limited Company
Xiaohong Dong
Tianjin University,
The Key Laboratory of Smart Grid of Ministry of Education
The
and
134
interactions
between
the
the distribution network
transportation system
become more and
The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
more close due to the electric vehicles charging in the fast
charging stations which are considered as a new kind of public
service infrastructure and a special power load. In this paper, a
probabilistic evaluation method to voltage profile of distribution network considering the electric vehicle charging choice is
proposed. Firstly, a special-temporal distribution of the charging load of electric vehicles is determined considering the uncertainties of battery characteristics, travelling behaviors, and
the charging choices. Then, the temporal distribution of the
fast charging station load is determined. Finally, the voltage
profile of distribution network is evaluated in the test case.
What's more, simulation results illustrate that the effect of
various electric vehicle charging choices on the voltage profile,
by comparison.
TuF04.1
Power Grid Diagram Automatic Mapping Algorithm for the Radial Distribution Feeder
pp. 2663-2667
Boxi Zhou
State Grid of Electrical Technology Coll.
Youpeng Fan
State Grid of Electrical Technology Coll.
Hui Jing
State Grid of Electrical Technology Coll.
Hongwei Zhang State Grid of QingDao Power Supply Company
Xinpei Hao
Electrical Engineering Coll. of ShanDong Univ.
This paper takes CIM_SVG based radial distribution feeder as
the research object and designs an automatic mapping algorithm. Firstly, feeder’s branches belong to different levels are
preliminarily arranged in vertical and horizontal direction
according to CIM_SVG based data. Then, a lever-to-lever
trunk-branch model and corresponding branch-regional model
which confirm the object oriented programming (OOP) are
proposed. By utilizing the models proposed, the extremely
asymmetrical branches and the overlap/cross regions in the
preliminary mapping are identified and eliminated. Finally, the
mapping of a 10kV radial distribution feeder is taken as an
example to demonstrate and validate of the algorithm. It is
shown that the algorithm proposed is able to draw the typical
distribution network in few seconds and can be expanded to
the use of other application in the distribution network visual
analysis.
TuF03.10
Optimal Matching Strategy Based on Electric Vehicle Contactless Charging Compensation Model
pp. 2658-2662
Shuang Zeng
Electric Power Research Inst.
State Grid Beijing Electric Power Company
Yuan Jin
Electric Power Research Inst.
State Grid Beijing Electric Power Company
Xiulan Liu
Electric Power Research Inst.
State Grid Beijing Electric Power Company
Cheng Gong
Electric Power Research Inst.
TuF04.2
State Grid Beijing Electric Power Company
Longfei Ma
Electric Power Research Inst.
Research of Marketing-Distribution-Dispatching
Integrated System in Rural Grid
pp. 2668-2671
State Grid Beijing Electric Power Company
Compensation mode has an important influence on the efficiency and power characteristics of contactless charging system. Analyze the necessary of power compensation for the
loosely coupled transformer based on electromagnetic inductive contactless charging system structure of electric vehicle.
By analyzing the four kinds of compensation models, the S/S
model is selected due to its high system efficiency and easy
control, and the matching relationship between the system
frequency and the equivalent load is put forward. In the premise of considering the system efficiency and the user experience,
the efficiencypreferred operating frequency selection strategy
of the electric vehicle electromagnetic inductive contactless
charging system is proposed, which contributes to produce a
new idea to maintain the system to work efficiently by the operating frequency adjusting. The correctness of the analysis
and optimization strategy is verified by examples.
Lu Wang
Nari Group Corporation State Grid Electric Power
Jin Zhu
Nari Group Corporation State Grid Electric Power
Research Institute
Research Institute
With the development of smart grid, the key to solve the problem of intelligent development of rural grid is information
integration. This paper proposes to make a MarketingDistribution-Dispatching integrated System in rural grid with the
data acquisition and analysis of the electric energy data acquisition system, dispatching and distribution integrated system
and marketing system, by the use of information sharing and
data exchange technology. This system which contains power
grid operation and enterprise management will provide technical support for enhancing the leader’s capacity of management and decision-making.
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algorithm is proposed to produce the optimal scheduling
strategy of the ADS, and the solution algorithm for ADS is
introduced in detail. Finally, the case study demonstrates the
validity of the proposed optimal scheduling model and the IHS
algorithm for ADS.
TuF04.3
A Study on Short-term Trading and Optimal Operation Strategy for V irtual Power Plant
pp. 2672-2677
Chunfa Dong
North China Electric Power Univ.
Xin Ai
North China Electric Power Univ.
Shuai Guo
North China Electric Power Univ.
Kunyu Wang
North China Electric Power Univ.
Yiran Liu
North China Electric Power Univ.
Le Li
North China Electric Power Univ.
TuF04.5
Pseudo-Sequential Monte Carlo Simulation for
Distribution Network Analysis with Distributed
Energy Resources
pp. 2684-2689
A virtual power plant (VPP) model, which consists of a wind
power plant, interruptible loads, a pumped storage plant and a
gas turbine, is built considering the uncertainty of the power
output of renewable energy sources (RES) as well as the participation of demand response (DR) resources. Multi-scenario
method is used to deal with the uncertainty of day-ahead market price and power output of wind power plant. A short-term
trading model, which is based on multi-stage stochastic programming with the objective of maximization of VPP bidding
profits in dayahead market combined with penalty in balancing market, is constructed considering the characteristic that
the uncertainty of stochastic variables reduces when time approaches. It is shown that the model constructed could notably
promote the certainty gain of VPP.
Optimization Schedule of Active Distribution
System Based on Improved Harmony Search Algorithm
pp. 2678-2683
Xi’an Univ. of Technology
Fuping Yan
Xi’an Univ. of Technology
Lupeng Chen
Xi’an Univ. of Technology
Kaiyu Wang
Xi’an Univ. of Technology
Yang Lei
Xi’an Univ. of Technology
Southeast Univ.
Yu Liu
Southeast Univ.
Multi-phase Distribution State Estimation W ith
Only Direct Measurements
pp. 2690-2694
The optimization schedule strategy of the active distribution
system (ADS) is the core technology required to actively manage distributed energy resources (DERs) and to guarantee the
economical utilization and safe operation of renewable energy
generation. This paper investigates an optimal scheduling
model for the ADS on the basis of ADS itself and DERs features, whose purposes are minimizing voltage deviation and
minimizing the operational expenditures of a complete dispatching cycle by means of controllable DERs. In addition, the
harmony search (HS) algorithm is improved by using uniform
distribution of the initial harmony library and variable dimension harmony memory, the improved harmony search (IHS)
November 26-29，2015 Changsha，China
Shan Gao
TuF04.6
Xi’an Univ. of Technology
Teng Mu
Southeast Univ.
The high penetration of distributed energy resources (DER) in
future Active Distribution Network (ADN) will bring great
challenges to distribution network analysis. This paper presents a new methodology based on pseudo-sequential Monte
Carlo (PSMC) simulation for the reliability assessment of distribution network with wind farms, photovoltaic generators
and batteries. The proposed approach retains the computational efficiency of non-sequential Monte Carlo simulation and
the accuracy of sequential Monte Carlo simulation for it considers the chronological aspects of load, DER and batteries
when evaluating failure sequences. Micro-grid operation, DER
use strategy and optimal load shedding strategy are also considered in this method. Case study on the line 4 of IEEE
RBTS-BUS6 is presented to prove the practicability of the
method. The effects of DER integration on the distribution
network reliability indices are also discussed.
TuF04.4
Jiandong Duan
Le Yu
Yuntao Ju
China Electric Power Research Inst.
Wanxing Sheng
China Electric Power Research Inst.
Xiaohui Song
China Electric Power Research Inst.
Jing Wang
China Electric Power Research Inst.
Wenchuan Wu
Tsinghua Univ.
There are mainly two kinds of state estimation measurements'
model in recent research. One model considers that direct
measurements and indirect measurements are uncorrelated,
the other model considers that indirect measurements have
strong correlation with the direct measurements where they
are derived, and the correlation can be described as covariance
elements in weight matrix. In fact, without using the indirect
measurements, state estimation can already be solved with only
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direct measurements. This paper proposes a state estimation
method which only adopts direct measurements. Its efficiency
and accuracy are certified by numerical tests.
TuF05.1
Experimental Study of the Online Monitoring of
the Mechanical Characteristics of a Hydraulic
HighVoltage Circuit Breaker
pp. 2706-2709
TuF04.7
Day-ahead Active Distribution Network Optimal
Schedule with EV Penetration
pp. 2695-2699
Zhenxing Zhao
Xianjun Ge
Hao Xiao
Chengyou Wang
Candong Liu
Inst. of Electrical Engineering Chinese Academy of Sciences
Inst. of Electrical Engineering Chinese Academy of Sciences
With the popularization of electric vehicles, electric vehicles in
the active distribution network continue to expand the scale.
Electric vehicles access to the active distribution network to
participate in the economic dispatch with other distributed
powers. This can reduce the total cost of active distribution
network. In addition, the owners of the electric vehicle can
make profit when their vehicles paticipating the dispath. This
paper presents an active distribution network operation optimization model. The target of this model is to take the lowest
operating cost of the active distribution network, in each calculation period. The algorithm is used to control the distributed generation units and the flexible load in the active distribution network, and optimize the electric vehicle charging and
discharging. Changes of the number of electric vehicles and
changes of charge and discharge cost of electric vehicles are
discussed. The accuracy of the results is verified by using IEEE
13 node test feeders.
TuF05.2
Realization of A Simulation Test Method for
Feeder Automation of Power Distribution Automation System
pp. 2710-2714
TuF04.8
Active Distribution System State Estimation
Considering the Characteristics of DGs
pp. 2700-2705
Jiangsu Electric Power Company Research Inst.
Qiang Li
Jiangsu Electric Power Company Research Inst.
Xiaodong Yuan
Jiangsu Electric Power Company Research Inst.
R & D Center Taikai Electric Automation Co., Ltd
Online monitoring of primary equipment such as circuit
breakers is widely used in smart substations. By analyzing the
data acquired from online monitoring systems, the circuitbreaker status can be monitored, and the health of the breaker
can be determined comprehensively. Using an online monitoring system, tests were carried out to measure the mechanical
characteristics of a hydraulic high-voltage circuit breaker.
Opening and closing coil current curves and distance curves
were experimentally obtained by applying 0, 10, 20, and 50 kA
of instantaneous load current. The main eigenvalues of the
mechanical characteristics were calculated using the online
monitoring system. Although varying the load current does not
impact the motor or circuit-breaker closing performance, the
experimental results show that large load currents will impede
breaker opening, a phenomenon that had not been reported
prior to the online monitoring tests described here.
China Electric Power Research Inst.
Xiong Yang
University of Jinan
Shilei Guan
China Electric Power Research Inst.
Wenbo Fan
China Electric Power Research Inst.
Haoliang Lei
China Electric Power Research Inst.
Lan Liu
China Electric Power Research Inst.
Dongliang Li
China Electric Power Research Inst.
According to the lack of unified, standardized testing methods
for the feeder automation function of distribution automation
system, this paper introduces a kind of simulation testing
method realization of feeder automation function, which can
provide technical reference for the bidding, and strengthen the
quality control and operation management of power distribution automation system. This method setups testing environment by using the DATS–1000 distribution network automation master station injection testing system, simulates feeder
and typical fault under the actual working condition and evaluates the feeder automation function conformed to the standard requirements. Through the actual products testing, this
simply operated method was verified, it can reduce physical
impact and testing cost effectively, which indicates that can be
used for feeder automation function testing and also can be
acceptance for the power distribution automation system simulation test and site.
In this paper, an active distribution system state estimation
(ADSSE) method with considering the characteristics of distributed generations (DGs) is proposed, in which the running
and controllable characteristics of DGs are discussed and analyzed. The mathematical model which can reflect realtime
monitoring of the running and controlling state of DGs is established, and their running state variables and controllable
parameters are introduced into ADSSE based on weighted
least squares (WLS), then the state estimation model of the
proposed ADSSE method is obtained, which can accurately
estimate the running state variables and controllable parameters of DGs. Finally, it follows from the simulation results that
the proposed ADSSE method is successful and effective.
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object on the application layer is represented by the FSM. In
each FSM, the communication drives the FSM from state to
the other which is also called state transition. The event set
includes all of the events which have impacts on the communication procedure. As a novel method to model the communication based on IEC60870-5-101/104, the DES accurately describes the behaviors of the system and enhances the reliability
of the communication by using the supervisory controller.
TuF05.3
Data Quality Analysis and Improved Strategy
Research on Operations Management System
for Electric Vehicles
pp. 2715-2720
Lu Zhang
Electric Power Research Inst.
TuF06.1
State Grid Beijing Electric Power Company
Yanxia Chen
Electric Power Research Inst.
The Influence Factors Experiment of Poor Contact Discharge in Indoor Power Grid
pp. 2725-2729
State Grid Beijing Electric Power Company
Jie Zhu
Electric Power Research Inst.
State Grid Beijing Electric Power Company
Mingyu Pan
Electric Power Research Inst.
State Grid Beijing Electric Power Company
Zhou Sun
Electric Power Research Inst.
Chengjiang Wang
China Three Gorges Univ.
Qiang Liu
China Three Gorges Univ.
Qi Zhang
China Three Gorges Univ.
Yi Yang
Power Supply Bureau of WanZhou
State Grid Beijing Electric Power Company
Weixian Wang
Electric Power Research Inst.
In order to achieve monitoring on poor contact in indoor power grid and avoid electrical fires, the discharge phenomenon
caused by poor contact is experimented systematically. A discharge experiment model of poor contact is developed, in
which the influence of the structural parameters of contact
type and the gap distance on poor contact discharges are experimented, and the influence of the operating parameters of
load type (cos ϕ ), load current and voltage phase are experimented too. The influence factors of initial discharge and the
influence regular patterns with various parameters have been
obtained from a large number of experiments. Statistical results show that the discharge trend increases first and then
decreases. In the range of experiment load, poor contact discharge is very sensitive to the structure parameters of contact
model, in comparison, it is not sensitive to operation parameters such as load type and load current. When the phase of
experiment-voltage is in the vicinity of 0°, 60°, 120°, 180°,
240°, 300°, it has intensive discharge region of poor contact,
and this phenomenon has the similarity under different factors.
State Grid Beijing Electric Power Company
It is very important for Operations Management System (OMS)
and big data analysis application to improve the data quality of
Electric Vehicle (EV) charging service. This paper focuses on
the charging transaction record data from the Beijing EV
charging OMS, and analyzes error types and distributed locations of the abnormal data. Based on the mathematical logic
among various kinds of operation data, the data selection rules
and processing method are proposed, and the system improved
scheme is given. Through the design and application of data
selection and processing module, the abnormal data can be
timely detected and corrected. It is also beneficial for the system operation and maintenance to improve the acquisition
data quality. The comparative analysis results verify the feasibility and effectivity of the proposed scheme. This research is a
necessary guarantee for the big data technology application.
TuF05.4
TuF06.2
Event System Based Automatic Testing Method
for Intelligent Terminal Communication Protocol
pp. 2721-2724
Zhong Chen
Changsha Univ. of Science and Technology
Junhui Zhao
Univ. of New Haven
Xiaopeng Yu
Changsha Univ. of Science and Technology
A Two-Stage Tradeoff-PCA Method for Assessing
Environmental Benefits of Smart Distribution
System
pp. 2730-2735
A novel method based on the Discrete Event System (DES)
theory is proposed to solve the compatibility and interoperability issues among devices from different manufactures for the
application of IEC60870-5-104 in distribution networks. In this
paper, the DES method, which is described by a Finite State
Machine (FSM), is employed to model the communication
procedure based on the IEC60870-5-104. In the model, each
November 26-29，2015 Changsha，China
Yingzi Li
North China Electric Power Univ.
Bo Zeng
North China Electric Power Univ.
Pengcheng Xu
North China Electric Power Univ.
Zongqi Liu
North China Electric Power Univ.
Focusing on the absence of systematic indicators and methodologies for evaluating environmental benefits of urban network
planning quantitatively, this paper studies and proposes a new
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
comprehensive evaluation index system and method for urban
TuF06.4
power grid planning. The model is mainly composed of two
parts: (1) A new quantitative index system including pollutant
Construction Mode and Embodiment of Dispatching Automation System for Distribution
Network
pp. 2741-2746
emission, carbon emission, environmental coordination, landscape aesthetics, as well as economic feasibility，in which the
impacts of DG integration are also considered; (2) A two-stage
evaluation method, which combines multiple attributes
Tao Han
tradeoff analysis and principal component analysis, to deal
Beibei Zhang
with excessive dependence on the subjective judgment in the
traditional evaluation methods. The simulation results of a real
Hongwei Du
urban network in China are presented and discussed, illustrating that the proposed model is effective and superior, which
Yinghua Song
helps guide the urban power grid towards an eco-friendly fu-
Xianghao Wang
ture.
Yanghao Zhou
Huichao Wu
TuF06.3
In order to adapt to system requirements of “Operation” and
achieve a high degree of integration about the county two grid
business, Proposed a set of principles to differentiate construction to achieve a modern grid with automation, information
technology, interactive features targeted distribution network
dispatching automation system building programs. For distribution automation management needs and characteristics,analyzed of differences between energy management system (EMS) and distribution anagement system(DMS) from
modeling,basic functions,analysis applications and information
interactive applications of distribution network. From the
perspective of the integration of EMS / DMS functional integration or independent construction, according to the scale of
construction in different areas, proposed two kinds of construction ideas includes EMS / DMS independent and integration,and given in detail construction mode. Depending on the
construction model, discussed the problem to be solved such as
data collection,fault handling, electronic wiring diagram and
implementation methods. Analysis of the risks to upgrade existing areas dispatching system into integration of dispatching
system which includes distribution network.
A New Approach for Fast Reliability Evaluation
of Composite Power System Considering W ind
Farm
pp. 2736-2740
Pengcheng Xu
North China Electric Power Univ.
Yingzi Li
North China Electric Power Univ.
Qi Chen
North China Electric Power Univ.
Wenxia Liu
North China Electric Power Univ.
Zongqi Liu
NARI Technology Co.,Ltd
NARI Group Corporation
NARI Technology Co.,Ltd
NARI Group Corporation
NARI Technology Co.,Ltd
NARI Group Corporation
NARI Technology Co.,Ltd
NARI Group Corporation
NARI Technology Co.,Ltd
NARI Group Corporation
NARI Technology Co.,Ltd
NARI Group Corporation
NARI Technology Co.,Ltd
NARI Group Corporation
North China Electric Power Univ.
Due to fluctuation and randomness of wind speed, reliability of
power system will be affected severely with increasing wind
energy injected into power grid. In order to evaluate reliability
of composite power system with wind farms, this paper proposes a new approach based on non-sequential Monte Carlo
TuF06.5
simulation (MCS) and the cross-entropy (CE), the basic idea is
to find an optimal distortion for probabilistic parameters of
Construction Policies of Distributed Power Generation
pp. 2747-2751
components using the CE concepts. A fault set based on linked
list is utilized to enhance the retrieval speed as well. As a result,
the computational efforts of the CE can be greatly reduced
Fang Luo
Dansheng Li
Ning Chen
Dawei Zhao
Xiangyan Wang
Minhui Qian
while retaining many of its main advantages. Comparisons
with CE, and non-sequential MCS are carried out using the
modifications of IEEE-RTS-79 (Reliability Test System) that
include wind farm. The results demonstrate that the improved
CE (ICE) method is of relatively high efficiency for reliability
China Electric Power Research Inst.
State Grid Corporation of China
China Electric Power Research Inst.
China Electric Power Research Inst.
China Electric Power Research Inst.
China Electric Power Research Inst.
This paper is about the construction policies of distributed
power generation. The distributed generation develops quickly
in the whole world. The construction policies of each country
can influence the industry development essentially.
Con-
evaluation of composite power system with wind farms.
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
struction policies of distributed generation can be considered
from three aspects: the distributed power generation admission policy, the grid construction costs policy and the governments encourage policy. The governments adjust policies to
influence the developing direction of distributed power generation. Good results are obtained in the practice.
Maturity Assessment Model of Smart Grid
Project
pp. 2752-2757
State Grid Energy Research Inst.
Xiaojun Li
Tianjin Univ.
Wenjin Qi
Tianjin Univ.
Qiming Zhao
Tianjin Univ.
Hongjie Jia
Tianjin Univ.
Han Huang
Tianjin Univ.
Yuan Zeng
Tianjin Univ.
Yanli Liu
Tianjin Univ.
State Grid Zhengzhou Power Supply Company
Hao Zhong
State Grid Zhengzhou Power Supply Company
In the modern power system, the dynamic rating technology of
transmission line has been drawing more and more attention in
power system operation research. Developing dynamic rating
system can raise short-term transmission capacity of transmission lines effectively and safely to satisfy the demands for
power supply under emergency. The dynamic rating model
based on thermal circuit is derived through the foundation of
steady state model and transient state model of thermal circuit.
The overhead transmission line temperature at any time is
obtained through the first-order thermal circuit model. The
field test data of dynamic rating system is analyzed. The effectiveness of the proposed model and dynamic rating system is
verified by the simulation test and field test.
TuF06.6
Xiaoling Jin
Zhaohui Li
TuF06.8
Forecast of Line Ice-coating Degree Using
Circumfluence Index & Support Vector Machine Method
pp. 2764-2768
From the point of view of project maturity, this paper builds
the maturity assessment model of smart grid project. Based on
the general rules of the smart grid project, the assessment
model evaluates smart grid project comprehensively, including
technical maturity of key technology of the project, project
policy and environment, project management level and project
business model. In this paper, the project maturity assessment
system is built, with the joining between technical maturity
and the project maturity, where the technical maturity of the
key technology project is one of the first grade indexes of the
project maturity. This paper uses sequence relations method to
assess the indexes of the project maturity, and analyze the influence on the project maturity brought by the uncertainty of
bottom evaluating index, by using Gram-Charlier expansion.
Then this paper analyzes the uncertainty of the result. Finally
the national wind- photovoltaic-energy storing pilot project
verifies the effectiveness and the rationality of the proposed
evaluation model.
Jingjie Huang
Changsha University of Science and Tech.
Hongming Yang
Changsha University of Science and Tech.
Yi Wang
Changsha University of Science and Tech.
Forecast of line ice-coating plays an important role for reducing the damage of power grid from ice rain efficiently. Aiming
at the climate feature and forecast purpose in Hunan area,
forecasts for ice-coating number of days and ice-coating thickness are transformed into forecasts for ice-coating degree. According to the calculated ice-coating degree coefficient,
ice-coating degree is indicated and divided. Because normal
climate information and ice-coating forecast method are hard
to satisfy the requirement of de-icing schedule and financial
risk reducing, circumfluence indexes as atmosphere information and support vector machine (SVM) as forecast method
are presented to forecast lines ice-coating degree. Through
correlation analysis about 74 circumfluence indexes to
ice-coating degree, correlation coefficient and associated correlation coefficient are calculated and listed. These 8 circum-
TuF06.7
fluence indexes of higher coefficients are chosen as independ-
A Thermal Model Based Dynamic Rating
System for Overhead Transmission Lines
pp. 2758-2763
weeks or months. SVM models based on two kinds of kernel
ent variables to be used to forecast the ice-coating degree in
Yuehao Yan
State Grid Zhengzhou Power Supply Company
Wei Bao
State Grid Zhengzhou Power Supply Company
Jun Xin
Hui Lin
functions for forecasting
degree are
built.
adopted in Hunan. The parameters of two kinds of SVM models are got through Particle Swarm optimization. The forecast
results show that polynomial kernel function SVM model is
State Grid Zhengzhou Power Supply Company
more efficient and suitable than radial basis function to winter
State Grid Zhengzhou Power Supply Company
November 26-29，2015 Changsha，China
ice-coating
Ice-coating samples and circumfluence indexes of 30 years are
ice-coating forecast.
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The IEEE 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT 2015)
ability to deal with power grid collapse.
TuF06.9
TuF06.11
Application of the Principal Component
Analysis and Cluster Analysis in Comprehensive Evaluation of Thermal Power Units
pp. 2769-2773
Design of Main Circuit and Control System for
Connecting Series and Parallel Interface of W ind
Power Generating Unit
pp. 2780-2784
Liqun Shang
Xi’an University of Science and Tech.
Shoupeng Wang
Xi’an University of Science and Tech.
Shiping Su
Yimin Su
Guiying Liu
In order to improve the operational level of safety, reliability,
economy and environmental protection of thermal power units,
the principal component analysis (PCA) and cluster analysis
(CA) method were combined and proposed to assess the operating condition of fossil-fired power plants comprehensively,
which can resolve the problem on the evaluation of multiple
indicators. This method utilizes principal component analysis
to perform the standardization, dimension-reduction and
de-correl ation of multiple evaluation indicators system for
thermal power unit and abstracts the principal components.
Moreover, the principal components were extracted as a new
data matrix by cluster analysis. Finally the principal component scores and cluster classification were combined for comprehensive evaluation. It can provide the high reference value
for the power generation group on how to implement energy
saving, optimal operation, index evaluation and competition in
thermal power units. The practical example shows that the
proposed method is effective.
Changsha University of Science and Tech.
Changsha University of Science and Tech.
Changsha University of Science and Tech.
Since the wind is random, intermittent and uncontrollable
energy, conventional grid is difficult to adapt to the requirements of grid connected wind power. We can use inverter interface to improve quality and safety when wind power generation connected to grid. In this paper, a detailed study of the
wind power on the series and parallel interface and topology, a
detailed analysis the working principle and mathematical
model of the series and parallel interface, and a detailed analysis of the power characteristics of the wind power generation
are done. And also, the paper gives the series and parallel signal generation principle, a detailed analysis of serial and parallel output interface control hysteresis control method, and
the harmonic and reactive power signal simulation. What’s
more, the paper studied signal detection method in the dq0
coordinate, the working process of the power and hysteresis
control of PWM signal. Theoretical analysis and simulation
results show that the method and the control method of signal
detection is feasible.
TuF06.10
Simulation and Deduction System for Complex
Power Grid Collapse and Restoration Process pp.
2774-2779
Jiabing Han
Beijing Kedong Electrical Power Control System
Wenhui Wei Beijing Kedong Electrical Power Control System
Qihai Yuan
Beijing Kedong Electrical Power Control System
Changnian Lin, Beijing Kedong Electrical Power Control System
Guoping Wang,Beijing Kedong Electrical Power Control System
Shujin Zhou Beijing Kedong Electrical Power Control System
The power grid large-scale blackout and collapse always puts
our society in risk. Power grid companies must strengthen the
ability to deal with blackout and collapse. The complex power
grid collapse and restoration process simulation and deduction
system is designed. System structure and system functions are
described. This paper focused on the key technologies including power system simulation oriented to the collapse and restoration process, relay protection and automatic device simulation, and multi-agent simulation deduction. The system can
achieve accurate and complete simulation of complex power
grid collapse and restoration process, to reappear the whole
process. It can provide simulation and training tools for power
grid dispatchers and operators, to enhance the emergency
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November 26-29，2015 Changsha，China