1. Jun Wen, MVWG Chair Southern California Edison
MVWG Report to TSS May 2015
Jun Wen, MVWG Chair
Southern California Edison

2. Recent Meetings Meeting Date REMTF Meeting Mar 17-18, 2015
LMTF Meeting
Mar 18, 2015
MVWG Meeting
Mar 18-19, 2015

3. MVWG Activities Overview
Load Modeling
Renewable Energy Modeling
Generator Modeling, Testing, and Validation
System Model Validation
RAS Modeling
HVDC Modeling
Other Items
Next Meetings and Workshops

4. MVWG Approved Documents
For TSS Approval:
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

5. Load Modeling 5

6. Load Modeling – Composite Load Model CMPLDW Specification
The WECC Dynamic Composite Load Model (CMPLDW) Specifications Document was developed and unanimously approved by MVWG.
Motion: Approve the Composite Load Model (CMPLDW) Specifications Document

7. Load Modeling – Integrating DGs in Composite Load Model
The WECC Specifications for Modeling Distributed Generation in Power Flow and Dynamics was developed and unanimously approved by MVWG.
Motion: Approve the Specifications for Modeling DG in Power Flow and Dynamics.
CMPLDW will be retired upon implementation and approval of CMPLDWG.
Benchmark testing among the three vendors will be performed and presented at Nov 2015 MVWG meeting.

8. Load Modeling – Study Experience
Phase 1 CMPLDW Study Experience
Lower voltage dips and higher post recovery voltages are observed, as expected.
Phase 2 CMPLDW Study Experience
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
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
LDTRPMON – new model to monitor MW tripped per area/zone

9. Load Modeling – Voltage Dip Criteria
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.

10. Load Modeling – Future Development
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

11. Renewable Energy Modeling11

12. Energy Storage Modeling
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.

13. 2nd Generation Wind & PV Models
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.

14. REMTF – Next Steps
White paper on limitations of generic models and use in positive sequence programs – In progress
Expect for approval at the June MVWG meeting
PV Plant Model Validation Guide
Wind Plant Model Validation Guide will be next
Renewable Model Validation Workshop in June
Phase 2 renewable models are not well understood outside REMTF, webinars will be conducted to educate model users on model structure and data.

15. REMTF – Next Steps (cont’)
Enhanced Plant Level Control (REPC_B)
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)
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

16. Generator Modeling, Testing, and Model Validation16

17. Dynamics Error List Additional data checks in progress
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.

18. Cross Current Compensation Model
Enhanced Cross Current Compensation Model (CCOMP4)
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

19. Excitation Models
IEEE Standard on excitation models is close to going out for ballot
More discussion will be needed to determine which model(s) WECC will recommend to be the approved
Currently OEL1 is WECC approved

20. Power Plant Model Validation and Data Task Force (PPMVDTF)
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.

21. PPMVDTF Roadmap and Progress
PPMVDTF drafted roadmap for implementing renewable models with a phased approach
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
For 2015 light summer operating case:
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

22. System Model Validation22

23. Significant Events (Feb - now)
Date
Local Time (PDT)
GMT Time/Date
Frequency
Time to Recover
02/17/15
9:14
17:14
59.921 6
02/22/15
8:44
16:44
59.902 1
02/25/15
3:33
11:33
59.918 7
03/03/15
14:24
11:24
59.885
03/28/15
14:15
21:15
59.897 5
03/29/15
13:49
20:49
59.904 8
04/05/15
12:58
19:58
59.913 4
04/06/15
8:12
15:12
2-ph fault at PG&E
04/07/15
6:17
13:17
59.93 2
04/14/15
16:14
CJ brake insertaion test #1
9:24
16:24
CJ brake insertaion test #2
15:14
22:14
CJ brake insertaion test #3
15:24
22:24
CJ brake insertaion test #4
04/28/15
6:06
13:06
59.798 18

24. System Model Validation
Event Model Validation Efforts:
May DC RAS Event
In progress, plan for approval at the June MVWG meeting
October Colstrip Event
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 PDCI Outage
MOD-033
Draft guide on how WECC performs system wide model validation – in progress

25. RAS Modeling 25

26. RAS Modeling
James O’Brien updated the RAS modeling status and called for volunteers to develop the RAS modeling in transient stability
Eric Bahr (NWE) provided an overview of the Colstrip ATR scheme and the model specifications.
ATR model specifications and model are expected for approval at the June MVWG meeting

27. HVDC Modeling

28. HVDC Modeling Conventional HVDC point-to-point model
Powerflow model – exists
Dynamic model – target to have model specification and model for approval in the Nov MVWG meeting
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

29. HVDC Modeling
Current status of WECC base case models for PDCI, IPP DC and TBC was discussed
General 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.

30. Other Items 30

31. Other Items Program Updates NERC Updates WECC Updates SRWG Updates
PSLF, PowerWorld, PowerTech
NERC Updates
WECC Updates
SRWG Updates
WECC Website and MVWG Documentation
MVWG TFs
New LMTF and PPMVDTF Chairs

32. NERC Updates Eric Allen (NERC) provided updates:
NERC MWG drafted report to address the third step of node- breaker implementation plan (development of power system analysis software with the capability of using “node-breaker” representation).
FERC issued a NOPR proposing to approve PRC 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

33. WECC Project Updates WECC-0101 SAR Gen Validation Policy
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
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.

34. MVWG Documentation MVWG Page MVWG Share Drive
Upload Approved Documents
Adding Meeting Documents
MVWG Meeting Summary / TSS Report
MVWG Action Item Log
MVWG Model, Document, Tool, Webinar Reference Document
MVWG Share Drive

35. MVWG TFs LMTF – Hamody Hindi (BPA)* PPMVDTF – Steve Yang (BPA)*
REMTF – Abe Ellis (Sandia)
HVDCTF – Pouyan Pourbeik (EPRI)
* New TF Chairs in June 2015

36. Next Meetings & Workshops36

37. Next Meetings & Workshops
Jun in Salt Lake City
REMTF Meeting – Jun 16th afternoon and 17th morning
LMTF Meeting Jun 17th morning
MVWG Meeting -- Jun 17th afternoon & Jun 18th all day
HVDCTF and PPMVDTF will meet independently from the main M&VWG meeting
Workshops and Webinars
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

38. What to Expect in next TSS Meeting
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 DC RAS model validation report

39. Questions ? 39

40. October 18 2014 Colstrip Event
May DC RAS Event
17:31 PDT System frequency to 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 Colstrip Event
03:24 PDT System frequency fell from Hz to Hz and recovered within five minutes when Colstrip Units #3 tripped offline, rejecting approximately 729 MW of generation
Apr 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 and conductor parted.  System frequency to Hz momentarily and normal in 18 minutes when BPA-11 Remedial Action Scheme operated tripping 1824 MW of Pacific Northwest generation.

41. 2nd Generation Wind Models

42. Photovoltaic Models For large-scale PV plants:
For distributed and small PV plants, use PVD1 model