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Reconciliation of models (WECC base case and WSM)

Reconciliation of models (WECC base case and WSM). Technical Studies Subcommittee April 25-27, 2012 Slaven Kincic and Donald Davis, WECC. Objectives of presentation:. To highlight some differences in between WSM and BCS; To explain where those differences come from;

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Reconciliation of models (WECC base case and WSM)

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  1. Reconciliation of models (WECC base case and WSM) Technical Studies Subcommittee April 25-27, 2012 Slaven Kincic and Donald Davis, WECC

  2. Objectives of presentation: • To highlight some differences in between WSM and BCS; • To explain where those differences come from; • To initiate discussion on how to overcome those differences so that WSM can be used by planning and operation community with confidence; • To initiate discussion on how to standardize process of developing powerflow model from real time;

  3. Objectives (WSM): • Primary use of WSM is SE, RTCA and powerflow for RC studies; • We would like to: • Run near real time stability assessment in RC; • Provide planning/operation engineering community with base-cases from real time; • Provide cases for disturbance analysis; • M&VWG objective is to be able to use WSM to initialize dynamic simulation for model validation; • Correlate WSM and BCS

  4. About WSM: WECC RC Office has managed to: • Integrate efforts from BPA, CAISO and WAPA merging three models into the one (WSM); • Overcome data shearing barrier • Model updates • Measurements • Around 95,000 SCADA points mapped to WSM; • Multiple engineers are engaged in model update; • WSM is continuously benchmarked against real time measurements;

  5. Benchmarking WSM

  6. Benchmarking WSM

  7. Differences in between WSM and BCS • We have 12030 buses in WSM vs. 18021 in BCS (2012) • 9774 of 18021 buses in basecase (2012) is not matched in WSM • RC staff is working on Translation Tables to correlate what can be correlated in between two models. Mapping priorities: 1) HV buses , 2) Generators (for dynamic) 3) AC buses for HVDC 4) load buses

  8. Differences in between WSM and BCS • 69 kV and 46 kV normally not modeled in WSM –it accounts for large number of busses BCS vs. WSM

  9. Differences in between WSM and BCS • There are some substations in BCS that are not on line so not modeled in WSM e.g. • 60266 "LANGLEY 230; • 60267 "LANGLEY138 • 60268 "CC_CT C1 16.5 • 60269"CC_ST S1 13.8 • Outages in WSM • Some differences are to be expected due to switching and topology changes • Inherited differences from WSM predecessors

  10. Differences in between WSM and BCS • Step downs for load e.g.115kV/12.5 kV BCS WSM

  11. Differences in between WSM and BCS • Wind Power Plants Model • Single unit in BCS vs. multiple units in WSM • Collector System, low voltage step up

  12. Differences in between WSM and BCS BCS-Shepherds Flat

  13. Differences in between WSM and BCS WSM-Shepherds Flat

  14. Differences in between WSM and BCS WSM-Shepherds Flat

  15. Differences in between WSM and BCS • Units in Fourcourner that are connected on buses 14914 and 14915 are modeled as two units each for HP &LP turbine separately WSM basecase

  16. Differences in between WSM and BCS • In SE export there is no HVDC (ALSTOM issue) but instead HVDC is represented as load (positive and negative). WSM basecase

  17. Differences in between WSM and BCS • Comments: Four units are on bus 62011 in WSM. Instead only one unit is on that bus at BCS and each unit has its own step up transformer and bus. WSM (62011) basecase(62011)

  18. Conclusion and suggestions: • Assessment of differences in between two models (spreadsheet created) • Need to correlate buses • Need to correlate lines and transformers (configuration, impedances, taps …) • Need to correlate generators and generator buses (IDs and bus number must match) • Need to start adding missing buses (what is degree of the similarity needed?) • Correction of errors that do not allow initialization of dynamic case from SE snapshot

  19. Conclusion and suggestions: • Correction of HVDC issue in collaboration with vendors (since ALSTOM does not export HVDC but instead HVDC is modeled as a load ). After export script needs to add HVDC automatically in powerflow case that is exported; • Eventually, script might be used to add lower voltage busses if needed; • How to overcome modeling differences ? • Task Force within TSS that would provide guidelines to improve process ?

  20. West Wide System Model and Basecase Reconciliation Task Force (WBRTF) • Assessment of differences in between the two models; • Provide guidelines on how to overcome those differences; • Provide modeling recommendations for the breaker oriented model; • Conduct inspection of WSM, correlate equipment and equipment parameters; • Provide recommendations to insure proper mapping of equipment between WSM and BCS;

  21. West Wide System Model and Basecase Reconciliation Task Force (WBRTF) • Evaluate and coordinate where additional work needs to be performed (EMS side and planning side) to synchronize the two models; • Coordinate between the WECC RC and the planning community; • Asses limitations in modeling environments and work with vendors to fill the gaps; • Standardize process of developing powerflow case from EMS system;

  22. Questions?

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