MVWG Report to TSS
May 2015
Jun Wen, MVWG Chair
Southern California Edison
Recent Meetings
Meeting
Date
REMTF Meeting
Mar 17-18, 2015
LMTF Meeting
Mar 18, 2015
MVWG Meeting
Mar 18-19, 2015
MVWG Activities Overview
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Load Modeling
Renewable Energy Modeling
Generator Modeling, Testing, and Validation
System Model Validation
RAS Modeling
HVDC Modeling
Other Items
Next Meetings and Workshops
MVWG Approved Documents
For TSS Approval:
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The WECC Dynamic Composite Load Model (CMPLDW)
Specifications Document
The WECC Specifications for Modeling Distributed Generation in
Power Flow and Dynamics
The Simple Model Specifications REEC_C for Battery Energy
Storage System
Battery Energy Storage Model REEC_C to add to the WECC
Approved Dynamic Model List
PPMVDTF Charter
Load Modeling
Load Modeling – Composite Load
Model CMPLDW Specification
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The WECC Dynamic Composite Load Model (CMPLDW)
Specifications Document was developed and
unanimously approved by MVWG.
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Motion: Approve the Composite Load Model
(CMPLDW) Specifications Document
Load Modeling – Integrating DGs in
Composite Load Model
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The WECC Specifications for Modeling Distributed
Generation in Power Flow and Dynamics was developed
and unanimously approved by MVWG.
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Motion: Approve the Specifications for Modeling DG
in Power Flow and Dynamics.
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CMPLDW will be retired upon implementation and
approval of CMPLDWG.
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Benchmark testing among the three vendors will be
performed and presented at Nov 2015 MVWG meeting.
Load Modeling – Study Experience
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Phase 1 CMPLDW Study Experience
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Phase 2 CMPLDW Study Experience
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SCE’s studies show the voltage dips can go below 30%, the
voltage recovery to pre-fault voltage typically takes ~20 seconds,
and the post-recovery voltage can be up to 120%.
DOE-MEPPI WECC Load Model Sensitivity Study
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Lower voltage dips and higher post recovery voltages are
observed, as expected.
Four participating utilities: Pacific Corp, PG&E, SCE, SRP
Propose key sensitivity parameters and metrics in June LMTF
Production studies post-June
PSLF Load Modeling Enhancement
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LDTRPMON – new model to monitor MW tripped per area/zone
Load Modeling – Voltage Dip Criteria
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Idaho Power, SCE, and SRP will perform model
validation studies and present at June LMTF meeting
Discussed with WECC-0100 TVR AHWG and agreed to
have phased approach on voltage dip/recovery criteria in
corresponding to the composite load model
implementation schedule
MVWG will support WECC-0100 and provide composite
load model phase 1 and 2 study results.
Load Modeling – Future Development
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Modular Structure for better data management
Flexibility to add DG models
BPA sensitivity study of AC stalling with respect to a
point on wave – existing model is very conservative,
Vstall, Tstall may be represented by a curve
BPA “detailed” feeder model – feeder equivalent
structure may be revised based on PSCAD studies and
the need to integrate various types of DGs
Protection and control models
Parameter assumption
Renewable Energy Modeling
Energy Storage Modeling
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The Simple Model Specification REEC_C for Battery
Energy Storage System was developed and
unanimously approved by MVWG.
The new model REEC_C was unanimously approved to
be added to the WECC approved dynamic model list by
MVWG.
Motion: Approve the Battery Energy Storage Model
REEC_C Specifications Document
Motion: Add REEC_C to the WECC approved
dynamic model list.
2nd Generation Wind & PV Models
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Missing models and inappropriate represented models
(using genrou, gentpf, motor1 instead of renewable
models) are of a higher concern than the transition.
The transition plan to the 2nd generation renewable
models may not be completed as planned.
REMTF will help to develop the conversion routines to
help the transition – the function/performance won’t be
changed, GO and TP still hold the data responsibility.
REMTF – Next Steps
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White paper on limitations of generic models and use in
positive sequence programs – In progress
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PV Plant Model Validation Guide
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Expect for approval at the June MVWG meeting
Expect for approval at the June MVWG meeting
Wind Plant Model Validation Guide will be next
Renewable Model Validation Workshop in June
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Phase 2 renewable models are not well understood outside
REMTF, webinars will be conducted to educate model users on
model structure and data.
REMTF – Next Steps (cont’)
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Enhanced Plant Level Control (REPC_B)
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Additional new features: interface with multiple WTGs, interface
with reactive support devices, and plant level power factor
control option
Model specification and model are expected for approval at the
June MVWG meeting
Enhanced Inverter-based DG (PVD2)
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Additional new features: additional active power controls,
addition of time dimension to trip functions, auxiliary input for
other functionality.
Model specification and model are expected for approval at the
Nov MVWG meeting
Generator Modeling, Testing,
and Model Validation
Dynamics Error List
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Additional data checks in progress
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Over 6600 suspected data errors with John Undrill’s data
checker tool
PPMVDTF will prioritize and take the identified errors to build
into the dynamics error list
The renewable model checking was also planned to be added.
Cross Current Compensation Model
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Enhanced Cross Current Compensation Model
(CCOMP4)
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Use the reactive current instead of total current for feedback and
allow up to four units
Model specification and model are expected for approval at the
June MVWG meeting
Excitation Models
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IEEE Standard 421.5 on excitation models is close to
going out for ballot
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More discussion will be needed to determine which model(s)
WECC will recommend to be the approved
Currently OEL1 is WECC approved
Power Plant Model Validation and Data
Task Force (PPMVDTF)
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The scope of existing Power Plant Model Data Task
Force was expanded to include the model validation
task.
The charter of the Power Plant Model Validation and
Data Task Force was unanimously approved by MVWG.
Motion: Approve the charter of the Power Plant
Model Validation and Data Task Force.
PPMVDTF Roadmap and Progress
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PPMVDTF drafted roadmap for implementing renewable
models with a phased approach
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The work plan for renewable models is expected for approval at
the June MVWG meeting
PPMVDTF developed an epcl for extracting wind and
solar power plant model data from WECC base case
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For 2015 light summer operating case:
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WECC case has close to 29 GW of total wind and solar generation
100 MW of generation connected at 69, 115, and 138-kV levels
74 plants with 5 GW of generating capacity are connected at 24 to 35-V level, and
therefore have no collector system representation, as required by WECC Data
Preparation Manual, mainly Alberta and Colorado
94 plants with 5.2 GW of generating capacity have no dynamic models, mainly in
Southern California and Alberta
54 plants with 2.8 GW of generating capacity are modeled with inappropriate dynamic
models – “motor1”, “gentpf”, “genrou”, mainly in BC and Alberta
Significant opportunity for model improvement
System Model Validation
Significant Events (Feb - now)
Date
Local Time (PDT) GMT Time/Date
02/17/15
9:14
17:14
02/22/15
8:44
16:44
02/25/15
3:33
11:33
03/03/15
14:24
11:24
03/28/15
14:15
21:15
03/29/15
13:49
20:49
04/05/15
12:58
19:58
04/06/15
8:12
15:12
04/07/15
6:17
13:17
04/14/15
9:14
16:14
04/14/15
9:24
16:24
04/14/15
15:14
22:14
04/14/15
15:24
22:24
04/28/15
6:06
13:06
Frequency
Time to Recover
59.921
6
59.902
1
59.918
7
59.885
6
59.897
5
59.904
8
59.913
4
2-ph fault at PG&E
59.93
2
CJ brake insertaion test #1
CJ brake insertaion test #2
CJ brake insertaion test #3
CJ brake insertaion test #4
59.798
18
System Model Validation
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Event Model Validation Efforts:
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May 26 2014 DC RAS Event
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October 18 2014 Colstrip Event
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In progress, plan for approval at the June MVWG meeting
Node-breaker validation study completed, results show optimistic frequency
response than in reality
Further investigation in progress with focus on: governor sensitivity study,
performance of hydro units, and impact of station service loads.
Apr 28 2015 PDCI Outage
MOD-033
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Draft guide on how WECC performs system wide model
validation – in progress
RAS Modeling
RAS Modeling
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James O’Brien updated the RAS modeling status and
called for volunteers to develop the RAS modeling in
transient stability
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Eric Bahr (NWE) provided an overview of the Colstrip
ATR scheme and the model specifications.
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ATR model specifications and model are expected for approval
at the June MVWG meeting
HVDC Modeling
HVDC Modeling
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Conventional HVDC point-to-point model
model – exists
 Dynamic model – target to have model specification
and model for approval in the Nov MVWG meeting
 Powerflow
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VSC HVDC point-to-point model
 Powerflow
model – completed in all three software
tools
 Dynamic model – the interface between power flow
model and dynamic model still needs to be decided
HVDC Modeling
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Current status of WECC base case models for
PDCI, IPP DC and TBC was discussed
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Rule: black box modeling is not accepted,
generic model should be used as where fit.
 PDCI model specification and model are expected for
approval early 2016
 TBC model, depending upon the timing, may be
represented with generic VSC model that is under
development.
Other Items
Other Items
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Program Updates
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PSLF, PSS@E, PowerWorld, PowerTech
NERC Updates
WECC Updates
SRWG Updates
WECC Website and MVWG Documentation
MVWG TFs
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New LMTF and PPMVDTF Chairs
NERC Updates
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Eric Allen (NERC) provided updates:
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NERC MWG drafted report to address the third step of nodebreaker implementation plan (development of power system
analysis software with the capability of using “node-breaker”
representation).
FERC issued a NOPR proposing to approve PRC-002-2 and to
retire PRC-018-1
A new TF was approved under NERC MWG for turbine control
modeling
The revision of MWG Model Validation Procedure is planned to
be posted around end of 2015
WECC Project Updates
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WECC-0101 SAR Gen Validation Policy
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Drafting team chaired by Shawn Patterson USBR
Comments and feedback have been light. Shawn encouraged
more MVWG member involvement.
WECC-0107 PSS Design and Performance
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Drafting team chaired by Martin Bauer USBR (consists of
Control Work Group)
Elements currently under discussions are documenting when
PSS should be operational and grandfathering existing units.
MVWG Documentation
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MVWG Page
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Upload Approved Documents
Adding Meeting Documents
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MVWG Meeting Summary / TSS Report
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MVWG Action Item Log
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MVWG Model, Document, Tool, Webinar Reference Document
MVWG Share Drive
MVWG TFs
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LMTF – Hamody Hindi (BPA)*
PPMVDTF – Steve Yang (BPA)*
REMTF – Abe Ellis (Sandia)
HVDCTF – Pouyan Pourbeik (EPRI)
* New TF Chairs in June 2015
Next Meetings & Workshops
Next Meetings & Workshops
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Jun 16-18 in Salt Lake City
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REMTF Meeting – Jun 16th afternoon and 17th morning
LMTF Meeting -- Jun 17th morning
MVWG Meeting -- Jun 17th afternoon & Jun 18th all day
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HVDCTF and PPMVDTF will meet independently from
the main M&VWG meeting
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Workshops and Webinars
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Renewable model validation – In conjunction with REMTF
meeting, details TBD
How to use PSLF v19 and WSM in node-breaker format – Jun
24th 10-noon Mountain Time
What to Expect in next TSS Meeting
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Composite Load Model work plan
PPMVDTF work plan
MVWG Charter
MVWG work priorities
REPC_B model and model spec
ATR model and model spec
CCOMP4 model and model spec
Whitepaper on limitations of generic model
PV model validation guideline
May 26 2014 DC RAS model validation report
Questions ?
 May 26 2014 DC RAS Event
17:31 PDT System frequency to 59.665 Hz momentarily and normal in 14 minutes when
Celilo Converter 1 blocked and BPA-11 Remedial Action Scheme operated tripping 2500
MW of Pacific Northwest generation. WECC Transfer Path 65 (PDCI) limited with
converter out.
 October 18 2014 Colstrip Event
03:24 PDT System frequency fell from 60.0216 Hz to 59.9035 Hz and recovered within five
minutes when Colstrip Units #3 tripped offline, rejecting approximately 729 MW of
generation
 Apr 28 2015 PDCI Outage
06:06 PDT WECC Transfer Path 65 (PDCI) unavailable when Celilo-Sylmar 1000 kV DC
Line Poles 3 and 4 blocked and failed to restart after vehicle struck tower 133-2 and
conductor parted. System frequency to 59.798 Hz momentarily and normal in 18 minutes
when BPA-11 Remedial Action Scheme operated tripping 1824 MW of Pacific Northwest
generation.
2nd Generation Wind Models
Photovoltaic Models
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For large-scale PV plants:
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For distributed and small PV plants, use PVD1 model