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Underfrequency Load Shedding Assessment Report Kent Bolton

The Underfrequency Load Shedding Assessment Report reviews the effectiveness of the Coordinated Plan established by UFLSTF since 2009. It outlines strategies designed to stabilize and recover frequency following underfrequency load shedding (UFLS) events. The report presents main findings from simulations indicating that normal and abnormal system topologies can effectively manage frequency recovery to safe operating ranges. Key recommendations include modeling reactive devices accurately, reviewing generator settings for precision under extreme events, and continuing annual simulations of island scenarios to ensure system resilience.

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Underfrequency Load Shedding Assessment Report Kent Bolton

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  1. Underfrequency Load Shedding Assessment Report Kent Bolton January 30, 2014 JGC Meeting SLC, UT

  2. Coordinated Plan • UFLSTF formed in 2009 by PCC & OC • Review effectiveness of Plan • Designed to arrest declining frequency • Assist recovery of frequency after UFLS events

  3. Main Findings • Coordinated Plan maintained since 1998 with last review in 2009 • UFLS data base developed through PRC-006-WECC-CRT-1 • UFLS relay data consistent with WECC Base Case data • Several simulations evaluated – frequency in each case returned to safe operating range

  4. Main Findings, cont. • Coordination exists within the Coordinated Plan • Anti-stalling and overshoot in accordance with Coordinated Plan

  5. Base Cases • 13hsp1a spring on-peak • 13hs2 summer on-peak • 13ls1 summer off-peak • 14hw2 winter on-peak • 14lw1 winter off-peak

  6. Islands • WECC-WI Island (WI) • Canada Island (C) • North Island (N) • North Island w/o Alberta (NBF) • North Island w/o Canada (NWC) • AESO Island (A) • BC Hydro Island (BF) • South Island (S) • Imperial Valley Island (IV) • Mexico CFE Island (CF)

  7. Islands, cont. • San Diego Island (SD) • San Diego Area Island w/ Mexico and Imperial Valley (SIC) • San Diego Area Island w/ Imperial Valley (SDI) • San Diego Area Island w/ Mexico (SDC) • Impact of Variable generation

  8. Results • Normal topologies exhibit successful demonstration of UFLS • Including 25% imbalance cases, all frequencies recovered to > 58 Hz but not > 59.5 Hz • 15-sec anti-stalling stage • Doesn’t increase recovery frequency • 30-sec, 60-sec stages required?

  9. Results, cont. • Abnormal topology – September 2011 • San Diego, IV, CFE – 50% imports • Variable Generation • Increased amounts impact freq. recovery

  10. Conclusions • Coordinated Plan is adequate in safety-net use and application • Increased use of anti-stall component • WECC Base Case and program model should be reviewed

  11. Plot

  12. Recommendations • Assure automatically switched reactive devices are modeled • Assure voltage regulators and PSS are correctly represented • Review gen settings to assure correct representation • Continue to annually simulate island scenarios

  13. Recommendations, cont. • Load controller and governor settings in WECC base cases need review • Review WECC base cases for accuracy under extreme events – long and short term • Review initial stage load shedding and anti-stalling settings to determine if adjustments are necessary

  14. Recommendations, cont. • Review simulation results to determine if Coordinated Plan needs modification • Review V/Hz results and determine a defined method for measurement of performance • Include composite load model in next year’s assessment

  15. Next Steps • UFLSRG Mtg – SLC, Ut Feb. 18-19, 2014 • 2014 Data Request • GO Submittals due 6/1/14 • UFLS Entity Submittals due 7/1/14

  16. Questions?

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