1. Song Wang, MVWG Chair PacifiCorp
MVWG Report to TSS Jan 2017
Song Wang, MVWG Chair
PacifiCorp

2. Recent Meetings Meeting / Workshop Date SMVTF Meeting
November 15, 2016
LMTF Meeting
REMTF Meeting
November 16, 2016
PPMVDTF Meeting
MVWG Meeting
November , 2016

3. Aug MVWG Workshop Aug 30-31, Portland, hosted by BPA
The second regional workshop this year (1st regional workshop was held in March at San Diego)
Aug 30 and Aug 31 am: Load modeling
Aug 31 pm (closed session): System model validation
Workshop material available at

4. MVWG Activities Overview and Approval Items
Load Modeling
Composite Load Model phase 2 sensitivity studies – Information only
 Renewable Energy Modeling
DER_A Model Development-Specification – Information Only
Low Short-Circuit Ratio System Generator/Convertor Model (REGC_B) – Information Only
 System Model Validation

5. MVWG Activities Overview and Approval Items
Generator Modeling, Testing, and Model Validation
Revised GENTPJ white paper – Approval Item
Power System Stabilizer PSS1A model – Approval Item
HVDC Modeling
RAS and Relay Modeling
WECC Approved Dynamic Model List
NERC and WECC update

6. Load Modeling 6

7. Composite Load Model Data
Composite Load Model phase 2 sensitivity studies
New Stalling parameters and some new protection parameters
Aim to have phase 2 approved in time for 2018 base case program
Results are promising so far, good utility participation
Lab tests to reinforce assumptions are continuing

8. Composite Load Model Data
Composite Load Model phase 2 sensitivity studies

9. Composite Load Model Data
Composite Load Model phase 2 sensitivity studies

10. Composite Load Model Data
Composite Load Model phase 2 sensitivity studies
Proposed parameter ranges for Phase II composite load model
Parameter
Phase II – Proposed
Phase I
Motor D, AC stall voltage, Vstall
0.4 to 0.45
0.55 to 0.6
Motor D, AC stall time, Tstall
0.032 sec
99999 sec
Motor A fraction 1 trip, Ftr1a
0.2 to 0.4
0.2
Motor A, voltage 1 trip, Vtr1a
0.65
0.7
Motor A, time 1 trip, Ttr1a
0.1
0.02
Motor A voltage 1 reclose, Vrc1a
1.0
Motor A time 1 reclose, Trc1a
99999
Motor A fraction 2 trip, Ftr2a
= 0.95 – Ftr1a
Motor A, voltage 2 trip, Vtr2a
0.5 to 0.55
0.5
Motor A, time 2 trip, Ttr2a
Motor A voltage 2 reclose, Vrc2a
=Vtr2a + 0.1
Motor A time 2 reclose, Trc2a
0.05
Motor B fraction 1 trip, Ftr1ab
0.2 to 0.5
Motor B, voltage 1 trip, Vtr1b
0.6
Motor B, time 1 trip, Ttr1b
Motor B voltage 1 reclose, Vrc1b
=Vtr1b + 0.1
0.75
Motor B time 1 reclose, Trc1b
Motor B fraction 2 trip, Ftr2b
= 0.8 – Ftr1b
0.3
Motor B, voltage 2 trip, Vtr2b
0.45 to 0.5
Motor B, time 2 trip, Ttr2b
Motor B voltage 2 reclose, Vrc2b
=Vtr2b + 0.1
Motor B time 2 reclose, Trc2b

11. Composite Load Model Data
Composite Load Model phase 2 sensitivity studies
Participants in phase 2 study
BPA
SRP
SDG&E
SCE
PSE
PAC

12. Composite Load Model Data
Phase 2 timeline
Perform system impact sensitivity studies with new parameters by February 2017
March MVWG approval
May TSS approval
Seek approval of phase 2 parameters in time for 2018 study program

13. Air conditioner model development
Three types have been developed as part of load modeling efforts:
Performance model (static)
Dynamic phasor model
Point-on-wave model – detailed, first principles model

14. Air conditioner model development
Dynamic phasor model
Continuing Work
Model Development
Parameter Fitting

15. Power Electronic Loads
Model
Continuing Work

16. Power Electronic Loads
Modes of Operation of VFDs
Power loss mode
Coast: Disable inverter and allow motor to coast
Decel: Decelerate motor at correct rate so kinetic energy is absorbed to maintain DC bus voltage
Continue: Allow the drive to power the motor till the DC bus voltage is down to half
Restart mode
Auto-restart: automatically tries to restart – used for low inertia motors
Flying-start: auto-start the spinning motor at the original speed – used for high inertia motors

17. Load Model Software Benchmark
WECC LMTF has already completed a set of benchmarking test case.
Additional benchmarking has been done by EPRI and NERC LMTF.
The WECC LMTF is compiling final report now

18. NERC LMTF Updates
Ryan Quint provided updates of NERC LMTF activities. The accomplishments from 2016.
Dynamic Load Modeling Technical Reference Document:
Reliability Guideline on Modeling DER in Dynamic Load Models
Recently approved by the NERC Planning Committee 
Draft Reliability Guideline on Developing Load Model Composition Data
Load Model Benchmarking
Robust Implementation

19. Miscellaneous MEPPI sensitivity study
PNNL data request for load composition model and load protection model from Utilities:
Pqube event data and corresponding PMU data
End-use data (hour or subhourly)
SCADA data
Geographic information (number of buildings/customers)
Contact:
Phone: (305)

20. Renewable Energy Modeling20

21. Final update on REPC_B Model
The REPC_B model was implemented by all software vendors
A set of tests were simulated on a simple test case
Comparisons were done among the tools
Found minor bugs and fixed them along the way
In June the model was approved

22. Final update on REPC_B Model (Con.)
Difference in REGC_A

23. Low Short-Circuit Ratio System Generator/Convertor Model (REGC_B)
Current source model (REGC_A)

24. Low Short-Circuit Ratio System Generator/Convertor Model (REGC_B)
Four more parameters (Re, Xe, Ted, Teq)

25. DER_A Model development
PVD1
PVD2
DER_A

26. DER_A Model development

27. Standard DLL (Dynamic Link Library) Interfaces for User-Written Models
Model development process
Source: SENVION

28. Miscellaneous “Help with REMTF Dynamic Models” WECC Website
Wind Turbine Model Validation guideline document – in progress
WECC Battery Storage Dynamic Modeling Guideline
DOE Project on Control of Distributed Solar Plants
Placing an Energy Storage Model (REEC_C) in the CMPLDW

29. System Model Validation29

30. System Model Validation Studies
Slaven Kincic (PeakRC) provided updates of SMVTF activities and Dmitry Kosterev (BPA) provided updates of JSIS activities.
WECC White paper for MOD-033 compliance guideline is under review.

31. Generator Modeling, Testing, and Model Validation31

32. Excitation Models IEEE Standard 421.5 was approved.
MVWG plans to review and update the exciter models following the IEEE standard in effect

33. Power System Stabilizer Model
PSS1A model

34. Power System Stabilizer Model
PSS1A model
PSS1A model closest match for some installations
PSS1A model gives nearly identical output as WSCCST model
Unnecessarily complicated models increase chances of error
Request TSS approval of PSS1A model

35. Hydro Turbine Governor Model
Hydro turbine governor model h6e has been approved in last TSS.
The model represents digital governor logic supplied by American Governor Company, as now in service in many hydro plants in the Northwest
The model validation was completed for Kaplan and Francis turbine plants – Chief Joseph, Little Goose, and Bonneville.
John will provide the pseudo code and test case for software implementation.

36. GENROU, GENSAL, GENTPJ, GENTPF
The main difference between GENROU, GENSAL, GENTPF, GENTPJ models is the way to model saturation:
The saturation in GENROU (GENSAL) is modeled as an additive flux component
The saturation in GENTPF (GENTPJ) is represented as a multiplicative factor on all the inductances.
In addition, GENTPJ allows for modeling the effect of machine loading on saturation.

37. GENROU, GENSAL, GENTPJ, GENTPF
MVWG members agreed that should not blindly convert GENROU (GENSAL) model to GENTPJ. In every case a model should always be verified against measurements.
Motion:
Approve the modified WECC White paper on GENTPJ – “The Recommended Synchronous Generator Model: GENTPJ”

38. Dynamic Data Error List
The Dynamic Data Error List was split by five regions. Each region will be in charged by
Northwest (Gordon Kawaley, Bo Gong, Brandon Bouwman)
Northern California (Irina Green)
Rocky Mountain (Eric Bakie, Shawn Patterson)
Southern California (Jun Wen)
Desert Southwest (Zak Baumann)
For UFLS gen error list, the SRWG will take over to track generator errors.

39. HVDC Modeling

40. HVDC Modeling Conventional HVDC point-to-point dynamic model
Final memo and model sent to software vendors
No major progress on commercial beta implementation due to other commitments by software vendors
VSC HVDC point-to-point dynamic model
Started implementing an epcl code to test the concept. Currently under code debugging process
HVDCTF will come back to MVWG to start process of commercial software tool beta implementation and testing

41. RAS and Relay Modeling 41

42. RAS and Relay Modeling
The RAS Modeling & Validation Task Force (RMVTF) :
Not much progress yet
Glob monitoring model specification for reporting distance relay tripping.

43. NERC System Analysis & Modeling updates
System analysis assessments and studies
Modeling improvements
Technical document development
Subcommittee, working group, and task force efforts

44. WECC Approved Dynamic Model List44

45. WECC Approved Dynamic Model List
The latest approved dynamic model list is available at wecc.biz/Reliability/Approved%20Dynamic%20Models%20Novemb er% pdf 
Highlights of changes:
Add note on renewable models, the Phase I renewable models are still approved but people should start using the Phase II models.
PSS1A model was approved.
In software comments column, instances of “both programs” were changed to “all programs”.

46. Next MVWG Meetings 46

47. Next MVWG Meetings 1st MVWG Meeting 2nd MVWG Meeting 3rd MVWG Meeting
March 14 – March 16 Portland, OR
March 14 pm, SMVTF and LMTF
March 15 am, REMTF and PPMVDTF
March 15 pm – March 16 all day, MVWG
2nd MVWG Meeting
June Salt Lake City
3rd MVWG Meeting
Nov 7-9 Salt Lake City

48. Questions ? 48