1. Jun Wen, MVWG Chair Southern California Edison
MVWG Report to TSS Jan 2016
Jun Wen, MVWG Chair
Southern California Edison

2. MVWG Vice Chair
Song Wang (PacificCorp) agreed to serve as MVWG Vice Chair
- Principal Transmission Planner at PacificCorp
- 20+ years working experience in power system engineering

3. MVWG TFs LMTF – Hamody Hindi (BPA) PPMVDTF – Steve Yang (BPA)
REMTF – Spencer Tacke (MID)*
HVDCTF – Pouyan Pourbeik (EPRI)
SMVTF – Slaven Kincic (PeakRC)*
Relay TF? TBD
RAS TF? TBD
* New TF Chairs in Nov 2015

4. Recent Meetings and Workshops
Meeting / Workshop
Date
Load Modeling Webinar
Oct 22, 2015
HVDCTF Meeting
Oct 28, 2015
LMTF Meeting
Nov 17, 2015
REMTF Meeting
Nov 18, 2015
PPMVDTF Meeting
MVWG Meeting
Nov 18-19, 2015

5. MVWG Activities Overview and Approval Items
Load Modeling
Renewable Energy Modeling
White paper on limitations of generic model – Approval Item
System Model Validation
SMVTF Charter
Generator Modeling, Testing, and Model Validation
HVDC Modeling
RAS and Relay Modeling
Approved Dynamic Model List
2016 MVWG Meetings and Workshops

6. Load Modeling 6

7. Composite Load Model Work Plan
Direct phase 1 model improvements
Improve stall characteristics
Improve protection and control
Model implementation improvements
Consistent, robust rules for model initialization
Program benchmarking
Data management improvements
Efficient data management
R&D work
Component model flexibility (plug and play)
Motorc model benchmarking
Improvements to 3ph motor models
Load model data tool development
Model simplification
Evaluation of special studies
Expect for approval next meeting

8. Program Benchmarking Studies
The purpose is to ensure performance uniformity among the programs.
Benchmark methodology:
Simple 2 bus model
Play-in signal of frequency and voltage at the “system” bus
6 different play-in signals
6 different load models
Preliminary results indicated that overall models behave mostly the same.
The plan is to have benchmarking tests done by March 2016, and white paper by June 2016.

9. MEPPI WECC Load Model Sensitivity Study
Observations
Type of observation
Phase 2
Base Case
% change from Base Case
for all contingencies
(Motor D fraction)
Parameters
Heat Maps

10. Load Loss Summary Per Contingency
1PH Stuck Breaker
5+ branches lost
No-fault gen loss
No-fault gen loss
Line and gen loss
Double line loss

11. Composite Load Model Improvements
Motor characteristics were not fully captured by positive sequence program
The closer the fault is, the larger the breaking torque is.
Some continuums needs to be added to stalling phenomenon
John Undrill played a movie of hundreds of disturbance events seen by a feeder in Houston during summer. FIDVR doesn’t happen every time.

12. Stall Voltage and point-on-wave variation
Ramp voltage instead

13. NERC, DOE, and Industry Activities
NERC-DOE Joint FIDVR Workshop
Modeling-Subcommittee-(SAMS)-2013.aspx
NATF Load Modeling Activities
WECC LMTF Load Modeling Webinar
Oct 22, 2015
Available at WECC MVWG page  Seminars
NERC new LMTF
First meeting, Jan 12-13, Salt Lake Office
NERC and WECC LMTF coordination is being worked on to avoid overlap

14. Renewable Energy Modeling14

15. New REMTF chair: Spencer Tacke (MID)
Many thanks to Abe Ellis (Sandia) who served as REMTF chair for the past 10 years
REMTF charter is expected to be reviewed at the next meeting

16. Whitepaper on Limitations of Generic Models
Pouyan Pourbeik (EPRI) led and completed the White Paper “Value and Limitations of the Positive Sequence Generic Models of Renewable Energy Systems”
The White Paper summarized why the second generation renewable energy models were developed, and the limitations in their applicability.
The main limitations:
Not intended for use in performing studies of phenomena outside of typical range of frequencies of interest in power system stability studies (i.e Hz)
Not intended for detailed analysis of unbalanced phenomena
Not intended for detailed local studies associated with control tuning and design for the interconnection of win/PV to very weak system (i.e. short-circuit ratios below 2-3)
The White Paper was unanimously approved.
Motion: Approve the White Paper on the Limitations of Generic Models

17. Energy Storage Modeling
Xiaokang Xu (S&C) tested the battery storage model REEC_C across 4 software platforms. His simulation results showed large differences in the responses of the frequency and MW output, as well as noticeable differences of the voltage and MVAR output.
The most likely reason seemed to be the use of system base versus generator base when calculating the model per unit values.
The software vendors will look into this and the simulations will be re-run.

18. Enhanced Plant Level Control
REPC_B will have additional new features, including interface with multiple WTGs, interface with reactive support devices, and plant level power factor control option.
Work in progress. GE and PowerWorld have beta versions implemented. PTI is working on the model.
Jay Senthil (Siemens) presented his work on implementing the model. Jay proposed a new module for the plant controller which allows users to interface with up to 50 devices including Wind Type 3, 4, PV, STATCOM, SVC, Synchronous Condenser, etc., and allows for interface with the REPC_A model.
Jay proposed alternatives which would allow users to define a few, or many, sub-models that can interface with the existing REPC_A model
The proposal will be discussed among a small group, including Pouyan Pourbeik (EPRI) who wasn’t able to attend the meeting.

19. DG Modeling
Abe Ellis (Sandia) briefed the current revision work on IEEE DG tripping/recovery needs to be considered for the advanced DG modeling.
The flexibility to plug-in different DG models into the Composite Load Model was briefly discussed. Jamie Weber presented the implementation of DG for both power flow and dynamics in PowerWorld.

20. Others
“Generic Wind Turbine Generator Models for WECC – A Second Status Report” was awarded one of the four “Best of the Best” papers at 2015 IEEE PES General Meeting.
Potential work by Sandia and BPA sponsored by DOE:
Wind model verification tool
Wind model validation process and guideline
Vendor specific type 4 WTG modeling issues

21. System Model Validation21

22. JSIS Update
Dmitry Kosterev (BPA) provided update on the JSIS activities

23. SMVTF Charter SMVTF Charter was unanimously approved by MVWG
System Model Validation TF (SMVTF):
Select disturbance events and develop disturbance cases
2 Planning Case conversions per year
Have a basecase review process in place
Perform system model validation studies and provide modeling and practice recommendations
Have a communication mechanism in place to send out notification of disturbance events and disturbance cases (PC can choose to leverage the case or develop their own for MOD-033 compliance)
Create SMVTF tab at the MVWG page and maintain list of disturbance events and all the disturbance reports and slides
Conduct educational workshops
Chair of SMVTF will be Slaven Kincic (PeakRC)
Calling for more volunteers, more logistics need to be worked out
SMVTF Charter was unanimously approved by MVWG

24. System Model Validation Studies
Event Model Validation Efforts (WSM model validation):
May 28th Montana Event
June 17th Chief to Brake insertion
The results are reasonable, and it is much faster to prepare the WSM case comparing to the planning case approach.
More simulations are needed to gain more confidence and to improve models.

25. Generator Modeling, Testing, and Model Validation25

26. Generator Models Excitation Models Hydro-turbine Model
The ballot for IEEE Standard on excitation models closed, with 80% response rate and 100% approval rate.
MVWG plans to review and update the exciter models following the IEEE standard in effect
Hydro-turbine Model
BPA is working with John Undrill on the hydro-turbine model.
John provided an update on the h6e model.
Thermal Governor Model Practice (baseload flag)
PPMVDTF will compile the suspect error list and send to SRWG

27. Machine Documentations
John Undrill talked about the history of GENROU, GENSAL, GENTPF, GENTPJ models
GENSAL comes from limitations of analog computers in late 1950s
GENTPJ and GENTPF come from GENROU but with different saturation calculations.
The 2012 GENTPJ model specification document will be updated with reference documents
A Paper written by John Undrill but never submitted, if available
Documentation by Jamie Weber GENTPJ.pdf

28. Power Plant Testing and Model Validation
PPMVDTF had its first TF meeting, led by Steve Yang (BPA)
NERC SMS PPMV activities
Reliability Guideline draft – Power Plant Model Verification using PMUs
PSSE has added the play-in function
Pavel Etingov (PNNL) provided an overview of BPA-PNNL tool. Hassan Ghoudjebaklou (SDG&E) shared SDG&E’s experience using the PPMV tool
More participation to the TF activities is highly encouraged.

29. HVDC Modeling

30. HVDC Modeling Conventional HVDC point-to-point dynamic model
Final memo and model sent to software vendors
Once implemented by software vendors, EPRI will help to test with BPA PDCI data
Target to have model spec and model for approval in the March meeting
VSC HVDC point-to-point dynamic model
The interface between power flow model and dynamic model still needs to be decided
The proposal is to start with voltage source behind reactance model
Pouyan Pourbeik (EPRI) will go through the Transbay model to determine if it can be represented with the generic VSC model

31. RAS and Relay Modeling 31

32. RAS and Relay Modeling
GE implemented Steady State RAS implementation. The training videos for PSLF users are available at
James O’Brien (PeakRC) provided a brief update to the transient RAS modeling.
Jun Wen (SCE) will schedule a follow up call for RAS work planning
It seemed little interest on additional relay modeling

33. WECC Approved Dynamic Model List33

34. WECC Approved Dynamic Model List
All three software vendors reviewed and updated comment
All the blanks were filled in
“not approved”- the model was never approved by MVWG
“un-approved” – the model was approved at one time and then un-approved later
No model is incorrect modeling. If you don’t know what to do, consult with MVWG
Motion: Approve the WECC Approved Dynamic Model List??

35. 2016 MVWG Meetings and Workshops35

36. 2016 MVWG Meetings & Workshops
3 MVWG Meetings and 2 Hands-on Regional Workshops
South Regional Hands-on Workshop and 1st MVWG Meeting
March 8-10 San Diego
2nd MVWG Meeting
June Salt Lake
North Regional Hands-on Workshop
Aug 2-3 Portland
3rd MVWG Meeting
Nov Salt Lake

37. Questions ? 37

39. Type 1
Type 2

40. Type 3

41. Type 4

42. PV

43. BESS

44. Test System Very simple 2 bus model
Play in signal of frequency and voltage is done at the “SYSTEM” Bus
Vary the Load Model and the Playin Signals

45. Test Cases 6 Different Playin Signals 6 Different Load Models
FLAT – output with 1.03 voltage and 1.0 frequency, but with a Fault applied 50% of the way down the transmission line at sec and cleared at sec
FREQ – Drop of frequency to about per unit (about 59.5 Hz)
OSC – oscillatory signal of both voltage and frequency
VRamp – Ramp voltage down to zero, Frequency Flat
VSag75 – Ramp voltage down to 0.75, Frequency Flat
VSag90 – Ramp voltage down to 0.90, Frequency Flat
6 Different Load Models
ALL_P1 – all model types without motor stalling on LD1PAC
ALL_P2 – all model types including motor stalling on LD1PAC
MA – 100% motor A
MB – 100% motor B
MD_P1 – 100% LD1PAC without motor stalling
MD_P2 – 100% LD1PAC with motor stalling
This gives us 6 X 6 = 36 scenarios to test