WBRTF (West-wide System Model and Basecase Reconciliation Task Force)

1. WBRTF(West-wide System Model and Basecase Reconciliation Task Force) Technical Studies Subcommittee January 23-35, 2013 Slaven Kincic, WECC RCO

2. WBRTF progress update: • As of October 29, 2012 the WECC RC began posting converted next-day Operational Planning Analysis powerflow case; • WECC RCs use ALSTOM savecase of the WSM; • Since many BAs and TOPs within WECC cannot use ALSTOM case, case is converted into the following two formats: • PTI30 format (bus-branch model) and exported as a RAW file that can be imported into PSS/E and PSLF. • .csvfile format representing full topology model. • NDA signed (GE, PowerWord, V&R)

7. Millstones and timeline for WBRTF • WECC has launched web page dedicated to September 8, 2011 response : http://www.wecc.biz/About/sept8/Pages/default.aspx • Dashboard is used for tracking progress toward completion of the 27 Recommendations from the Joint FERC/NERC Report; • REC 16: WECC should ensure consistencies in model parameters between its planning model and its RTCA model and should review all model parameters on a consistent basis to make sure discrepancies do not occur;

8. Millstones and timeline for WBRTF • WECC Response (REC 16): • To address discrepancies between planning and operations models, WECC is focusing on the major WECC models: the WSM and the planning base cases. WECC has developed the West-wide System Model Base Case Reconciliation Task Force (WBRTF) to address this reconciliation. Work continues on correlating bus numbers with node identifiers and other data, including generator representations, between models.

10. WBRTF progress update: Proposed workflow approved on meeting on November 26th • WECC RC office will provide WSM export in PTI30 format and .csv format. The cases are posted on weccrc.org; • Transmission Operators (TOP)/ Balancing Authorities (BA) will perform comparison/inspection of WSM export to base case for their footprint (those involved in base case preparation should be involved in comparison/inspection) and indicate needed changes;

11. WBRTF progress update • Model inspection needs to be performed in phases based on priorities. The most obvious issues such as differences in system parameters are considered priorities: • Comparison indicates changes needed to match both cases. • WECC RC Modeling Engineers perform changes gradually and test changes, making sure those changes do not adversely affect the State Estimator (SE) solution.

12. WBRTF progress update • If some of the changes adversely affect WECC’s SE solution, re-verify recommended change and WECC RCO will investigate further in collaboration with Entity that has sent changes. • Completed changes will be tracked on progress Dashboard • Progress report is provided to the TSS at regularly-scheduled TSS meetings.

13. Millstones and timeline for WBRTF: • Phase 1: (Oct. 2012-March 2013) • Units Pmin>25MW, GSUs • Phase 2: (April. 2013-August 2013) • Lines and transformers • Phase 3: (Sep. 2013-Dec. 2013) • Shunt compensation devices • Phase 4: (Jan. 2014-Jun. 2014) • Finish validation of loads )

14. Millstones and timeline for WBRTF: • Current progress • IPCO completed inspection of units & GSUs; • BC-Hydro completed inspection of units, GSUs and system transformers; • PSE completed inspection of units; • SRP completed comparison of generators, GSUs and lines; • PaciCorp (PACE) completed comparison of units & GSUs; • SnoPUD completed inspection of units & GSUs;

15. Millstones and timeline for WBRTF: • SCE work in progress; • Tacoma Power work in progress; • PGE work in progress; • SCL in progress; • AESO work in progress • BPA work in progress; • Tracking the progress • BAs, TOs • WECC RC

16. Dynamic simulation: System Event 07/04/2012: • Arlington Plant Tripped • Palo Verde unit tripped 4 sec. later • WSM snapshot (powerflow case) representing system condition prior to disturbance has been sent to Dmitry so that he can adjust initial condition in WECC base-case for model validation • Adjusted PSLF case available at:  • http://www.wecc.biz/committees/StandingCommittees/PCC/TSS/BaseCases/Base%20Cases/Forms/AllItems.aspx?RootFolder=%2Fcommittees%2FStandingCommittees%2FPCC%2FTSS%2FBaseCases%2FBase%20Cases%2FComposite%20Load%20Studies&FolderCTID=0x01200068291443AA0B7A468B42DF79601BAB44 • Good occasion to compare base-case vs. WSM dynamic response using same .dyd

17. WBRTF meeting-dynamic simulation WSM: • Differences: • Some difference in in initial conditions; • Differences in power flow data; • No plant load in WSM; • Not all units are matched in .dyd file; • Composite load model used with base-case; • WSM in TSAT and base-case in PSLF;

18. Results: MW flow from PV #2

19. Results: MW flow from Cholla units

20. Results: Voltages on Cholla units terminals

21. Results: MW from Diablo units:

22. Results: Voltage on Diablo units:

23. Results: MW from NAVAJO units:

24. Results: Voltages on NAVAHO unit terminals:

25. Results: MW from CORONADO:

26. Results: Voltages on CORONADO:

27. Results: MW from Termex

28. Results: Voltages on Termex

29. Results: MW from Otay Mesa

30. Results: Voltages on Otay Mesa terminals

31. Next Steps: • Need more participation from BAs and TOs to perform validation/inspection of WSM to achieve target: • TSS & WECC RC to draft letter to ask members to perform validation/inspection; • WECC RC can deliver WebEx to PCC to ask more support if needed; • Node-breaker model-is that direction WECC wants? • White paper on pro et contra for node –breaker model? • Ownership and responsibility: • To support the maintenance and reviewing of the node-breaker model on continuous basis;

32. Questions?