1. Techno Economic Viability of Hybrid solar (PV) - AC Utility
Interfaced Power System for Rural India
S. N. Singh and A .K. Singh *
A hybrid solar photovoltaic(PV) - AC utility interfaced power generating system has
been developed for domestic use. The system consists of a photovoltaic array (installed
on the structure of roof ), an intelligent power controller and an inverter with battery as
an energy storage device. The system works in such a way that it utilizes maximum power
from PV source, convert it into useful AC power for household critical loads. The
variation in PV power is supplemented by grid power source integrated with the PV
source. The system finds wide application in rural sectors where the conventional source
of supply has been restricted and further expansion of utility (grid) supply is not
possible due to various technical & economic reasons. Thus it saves grid power and
reduces the over burdening of power on grid lines . The technology of solar energy
conversion into useful AC power through push-pull configured transistorised inverter
involve PWM strategy which produces a very near sine wave output with minimum THD,
leading to a high efficient system. The system has been designed for 300 W power supply
for critical loads. The simulation for generation of PWM pulses and computation of THD
value has been carried out. Performance of the system was tested under various
abnormal conditions like grid failure, low or no sunshine conditions etc. The system
provides optimum use of solar PV power with environmental benefits.
Keywords : Intelligent Hybrid (PV- AC) System Controller (IHSC),Total Harmonic
Distortion (THD), Pulse Width Modulation (PWM), Main Switching
Signal (MSS), Polarity Control Signal (PCS), Veri-log Hardware
Descriptive Language (VHDL), Field Programmable Gate Array (FPGA),
Depth of Discharge (DOD), Watt (W), Hour (h).
2. End-of-Life Evaluation of RTV Coated Porcelain and Glass
Insulators
Under Pollution Conditions
Shaik Abdul Saleem J. Amarnath
JNTU, Hyderabad
K. A. Aravind
CPRI, Hyderabad
D. Devendranath
CPRI, Bangalore
Abstract:
Ageing of Room Temperature Vulcanizing (RTV) silicone rubber coated porcelain and
glass disc insulators are reported under combined voltage stress and salt-fog conditions
till the loss of hydrophobic properties of RTV coating in an aging chamber. The electrical
characteristics are obtained by on-line monitoring of leakage current and material
characteristics are analyzed by Energy Dispersive X-Ray (EDX) Analysis. RTV coated
glass insulators shattered in to pieces after 2600 hours of aging while RTV coated
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porcelain after ageing for 4600 hours lost its hydrophobic properties and started
behaving like a normal un-coated porcelain disc insulator
3. DIAGNOSIS OF INTER TURN FAULT IN THE TRANSFORMER
WINDING USING WAVELET BASED AI APPROACHES
R.Rajeswari, Lecturer,
Dept.of Electrical Engg.
Alagappa Chettiar Engg. College,
Karaikudi, Tamilnadu, India.
raji_suci74@yahoo.co.in
Dr.N.Kamaraj, Assciate.Prof.
Dept.of Electrical Engg.
Thiagarajar College of Engg.
Madurai-625 215,
Tamilnadu, India.
nkeee@tce.edu
Abstract— In this paper, Wavelet based ANFIS for finding inter turn fault of
transformer is proposed. The detector uniquely responds to the winding inter turn fault
with remarkably high sensitivity. Discrimination of different percentage of winding
affected by inter turn fault is provided via ANFIS having an Eight dimensional input
vector. This input vector is obtained from features extracted from DWT of inter turn
faulty current leaving the transformer phase winding. Training data for ANFIS are
generated via a simulation of transformer with inter turn fault using MATLAB. The
proposed algorithm using ANFIS is giving satisfied performance than ANN and GABPN
with selected statistical data of decomposed levels of faulty current.
Keywords:
Winding InterTurn fault, ANN, ANFIS, DWT, GABPN
4. Novel Method of Network Reconfiguration for the Compensated
Network
Dr. M. Damodar Reddy1
1
Prof. V.C. Veera Reddy2
Associate Professor, Department of E.E.E., S.V. University, Tirupati, Andhra
Pradesh.
2
Professor, Department of E.E.E., S.V. University, Tirupati, Andhra Pradesh.
ABSTRACT: This paper delineates a novel method of network reconfiguration for the
compensated network. A two-stage methodology is used to reduce the losses and to
improve the voltage profile of the balanced radial distribution networks. In the first
stage, capacitors are placed optimally for the reactive power compensation of the
original network. Fuzzy approach is used to find the optimal capacitor locations and
Particle Swarm Optimization (PSO) method is used to find the sizes of capacitors. In the
second stage, an improved fuzzy multi-objective algorithm is used for the network
reconfiguration of the compensated network. The proposed method is tested on 33-bus
and 69-bus test systems and the results are presented.
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Keywords: Novel method - compensated network - fuzzy approach - PSO method network reconfiguration - fuzzy multi-objective algorithm.
5. Day-ahead electricity price forecasting in Victoria Electricity Market
using Support Vector Machine based Model
(1)
(2)
(3)
Sanjeev Kumar Aggarwal , L.M. Saini , and Ashwani Kumar
(1), (2) are with the EED, National Institute of Technology (NIT), Kurukshetra, India.
(3) is with the Tennessee Technological University (TTU), Cookeville, USA.
Email: vasusanjeev@yahoo.co.in, lmsaini@rediffmail.com, ashwa_ks@yahoo.co.in
In this paper, support vector machine (SVM), a new machine learning technique, based
model to forecast price profile in a single settlement real time electricity market has been
presented. The proposed model has been trained and tested on data from Victoria
Electricity Market (VEM) to forecast the Regional Reference Price (RRP). The selection
of input variables has been performed using correlation analysis and in order to take
advantage of the homogeneity of the time series, forty-eight separate SVMs have been
used to predict next-day price profile, with each SVM forecasting price for each trading
interval. Forecasting performance of the proposed model has been compared with (i) a
heuristic technique, (ii) a naïve technique, (iii) multiple linear regression (MLR) model,
and (iv) neural network (NN) model. Forecasting results show that SVM model possesses
better forecasting abilities than the other models and can be used by the participants to
respond properly as it predicts price before closing of window for submission of initial
bids.
Keywords: Correlation analysis, learning theory, multiple linear regression, neural
network, price forecasting, support vector machin
6. The structure and cure mechanism of 2,3-bis(benzimidazolyl)
pyridine with an epoxy resin system
P.V. Reddy, Sakuntala Samuelson, M.Nethaji and N.M. Nanje Gowda
Polymer laboratory, Central Power Research Institute, Bangalore 560 080, India
Department of Chemistry, Central College, Bangalore University, Bangalore 560 001,
India
Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore
560 012, India
ABSTRACT:
2, 3-bis (benzimidazolyl) pyridine was synthesized and characterized by CHN analysis
and techniques like infrared spectra, mass spectra and NMR studies. The structure was
established using X-ray crystallography technique.
The cure behaviour of 2, 3- bis (benzimidazolyl) pyridine has been investigated with
Bisphenol-A based epoxy resin with an anhydride hardener. The study has revealed that
this ligand behaves like an accelerator by reducing the cure and gel times of the resin
system. Kinetic studies based on DSC showed that the rate of curing increases with
enhanced concentration of this accelerator. The electrical properties of the cured epoxy
resin were unaffected with lower concentrations of 2,3 bis(benzimidazolyl)pyridine. A
mechanism for curing has been proposed based on infrared spectral studies which
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indicate the involvement of the secondary and tertiary nitrogen of
bis(benzimidazolyl)pyridine which enhances the cross-linking of the resin system.
2,3
Keywords: Accelerator, Crystal Structure, Epoxy resin, 2,3 bis(benzimidazolyl)pyridine
7. Optimum Cost Of Generation For Maximum Loadability Limit Of
Power System Using Multiagent Based Particle Swarm Optimization
(MAPSO)
A.Shunmugalatha
Associate professor / EEE
K.L.N College of Engineering
Engineering
Pottapalayam – 630611
Surya_subramanian@yahoo.com
Dr.S.Mary Raja Slochanal
Prof. & HOD / EEE
Thiagarajar College of
Madurai – 625 015
smrseee@tce.edu
Abstract-- To estimate voltage stability, maximum loadability limit (MLL) is one
approach. MLL is the margin between the operating point of the system and the
maximum loading point. The optimum cost of generation for MLL of power system can be
formulated as an optimization problem, which consists of two steps namely computing
MLL and the optimum cost of generation for MLL. This paper utilizes the newly
developed Evolutionary Multiagent Based Particle Swarm Optimization (MAPSO) in
solving this optimization problem. Details of the implementation of the proposed method
to modified IEEE-30 bus system, IEEE-57 bus system and IEEE-118 bus system are
presented. Simulation results show that the proposed approach converges to better
solution much faster, which prove the loadability and applicability of the proposed
method.
8. Optimal Coordination of Directional Overcurrent Relays Using
Charalambous Least pth Algorithm
N. A. Laway
Department of Electrical Engineering
National Institute of Technology, Srinagar-190 006
Jammu and Kashmir
In this paper, a new method for optimum coordination of directional overcurrent relays
in interconnected multi-loop power systems is proposed. The method is based on
Charalambous Least pth Algorithm. Normally the optimal directional overcurrent relay
coordination problem is solved by using Simplex Method of Linear Programming, which
is a computationally intensive method. Considerable computational effort can be saved
by using the proposed method. The method has been applied to solve the optimal
coordination problem of IEEE 14-bus power system and IEEE 57-bus power system.
Comparison of the Simplex Method and the Charalambous Method has been carried out
for the determination of optimal settings of the relays of the systems under study.
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9. A Review on Electrical Treeing in Solid Dielectrics
Michael G. Danikas - George E. Vardakis
Democritus University of Thrace, Department of Electrical and Computer Engineering,
Power Systems Laboratory, Xanthi 67100, Greece
ABSTRACT
Electrical trees constitute a cause of breakdown in solid dielectrics. Electrical trees are
related with partial discharges (PD), enclosed defects, which in turn cannot be separated
from faulty interfaces. In this review, certain aspects related to electrical treeing, such as
space charges, PD and enclosed voids are investigated .Charges, related to the electrical
treeing must be classified in two categories. The charges that are redistributed
continuously in the interior of the tree channels and charges that are moving and being
trapped in the solid dielectric. The first category of charges constitutes the PD charges
and the second category charges are referred to as the space charges.
10.
Mixed H2/H∞ Control of Continuous-time Singularly
Perturbed System - State feedback computations
S A Akbar (Scientist-F)*
A K Singh (Assistant
Professor)
Instrumentation and Electronics, ENG (Div.)
National Metallurgical Laboratory
Jamshedpur- 831007, INDIA
email-saa@nmlindia.org
Dept of Electrical Engineering
National Institute of Technology
Jamshedpur, INDIA
K B Datta (Ex. Professor)
Dept of Electrical Engineering
Indian Institute of Technology (IIT), Kharagpur
Abstract
This study brings out the scheme for the design of mixed H2 / H∞ based feedback
controller for a continuous-time singularly perturbed system using state feedback
computations. The mixed H2 / H∞ control law was derived using auxiliary cost
minimization approach and the feedback controller was formulated for a linear time
invariant lower and higher order continuous-time singularly perturbed systems by
solving iteratively coupled Riccati equations. The H∞- controller based on mixed
sensitivity approach and the Linear Quadratic Gaussian (LQG) controller were derived
for the same system. The time responses for unit step input and robustness properties
such as Gain and Phase margin were studied by formulating mixed H2 / H∞, H∞ and LQG
systems.
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[Keywords: H2/H∞ control, singularly perturbed system, H∞ and LQG control, state
feedback, Riccati equation, continuous-time]
11. Fuzzy Logic Based Fault Type Identification in
Radial LT Power Distribution Feeder
Ahalya. C and Shivakumara Aradhya R.S.
Abstract—Fault classification is necessary for rapid restoration of service to LT
consumers after occurrence of a fault. This paper presents step by step procedure for
identification of ten different types of faults commonly occurring in LT distribution
system. Information on the distribution transformer secondary current for different faults
at different load buses is used to define the input fuzzy variables. Fuzzy inference engine
and centroid de-fuzzifier are used to relate the input to fuzzy rule base and to obtain crisp
output respectively.
Index Terms— Fault classification method, Fuzzy Logic, LT Feeder, MATLAB, RSCAD
12. Performance analysis of solar flat plate collectors in scaling
environment
U.C. Arunachala*, M.Siddhartha Bhatt**, Dr. L.K.Sreepathy***
Scale formation in risers of solar flat plate collectors is evident in places where hard
water is being used. This affects both the component functioning as well as system
performance. In this paper, the influence of scale deposition on instantaneous efficiency,
mass flow rate and heat transfer rates are analyzed by the Hottel-Whillier-Bliss (H-W-B)
equation in both natural and forced circulation systems. It is observed that variation of
mass flow rate affects collector efficiency more than variation of heat transfer rates.
Keywords: Solar flat plate water collector, Scaling, Hardness, Instantaneous efficiency,
Natural circulation systems, Forced circulation systems
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