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UEL Modeling

UEL Modeling. WECC MVWG Meeting June 2014 Eric Bakie. Agenda. Impact of not modeling UEL Experience with User Written UEL Models. Case Description. Transient Stability Simulation N-1 Loss of Midpoint-Hemingway 500 kV Line 3-Phase Fault @ MPSN 500 kV with 4 Cycle Clearing

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UEL Modeling

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  1. UEL Modeling WECC MVWG Meeting June 2014 Eric Bakie

  2. Agenda • Impact of not modeling UEL • Experience with User Written UEL Models

  3. Case Description • Transient Stability Simulation • N-1 Loss of Midpoint-Hemingway 500 kV Line • 3-Phase Fault @ MPSN 500 kV with 4 Cycle Clearing • Back-Trip Hemingway-Summer Lake 500 kV Line • RAS: Trip One Jim Bridger Units @ 14.5 Cycles • Shunt Reactor and Shunt Capacitor Switching (mss1, msc1) • Path Flows • Midpoint West 1300 MW • Path 75 1416 MW • Path 17 2550 MW • Path 19 2300 MW

  4. Kinport Synchronous Condenser (140 MVA)gentpf, exst1, no UEL, qmin = -70 MVAR Field Current Reactive Power

  5. Kinport Synchronous Condenser (140 MVA)gentpf, exst1, epcmod UEL, qmin = -70 MVAR Field Current Reactive Power

  6. New Exciter – Developed New Modelsgentpj, esst4b

  7. Kinport Synchronous Condenser (140 MVA)gentpj, esst4b, no UEL, qmin = -70 MVAR Field Current Reactive Power -70 MVAR Machine Capability

  8. EPCMOD - UEL • EPCMOD did not work with new esst4b model • Limit variable in epcmod was genbc[@k].elimv • genbc[@k].elimt=1 • Found that variable genbc[@k].vuel needs to be used to work with esst4b • Suspected genbc[@k].vuel was the desired variable since [vuel] was shown on esst4b block diagram • Found that genbc[@k].vuel was not shown as an available variable in Table 5.2 of PSLF Manual • Ran simulation to test using genbc[@k].vuel and the epcmod worked with esst4b

  9. EPCMOD UEL Model Development

  10. Kinport Synchronous Condenser (140 MVA)gentpj, esst4b, epcmod UEL, qmin = -70 MVAR Field Current Reactive Power Switch Off Midpoint 345kV Capacitor Switch Off Kinport 345kV Capacitor

  11. Angles Switch Off Kinport 345kV Capacitor

  12. Conclusion • A uel model is needed to properly simulate this N-1 contingency at the desired path loading levels • Kinport Synchronous Condenser without UEL Model • minimum reactive capability significantly exceeded • Unit pulls out-of-step • Compared Qmin in Powerflow against Qmin in Dynamics • Found four other units exceeding their Qmin capability • Availability of standard uel models in the software applications would be helpful and will likely improve voltage profile accuracy in dynamic simulation

  13. Questions Eric Bakie, P.E. SYSTEM PLANNING ENGINEER Idaho Power | System Planning  (208) 388-5677  ebakie@idahopower.com

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