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IFRO Testing - WECC

IFRO Testing - WECC. Summary of Results Eric H. Allen – NERC. WECC 2012-13LW2 Case. L/O 2 PV (net 2740 MW) B: 59.78 Hz C: 59.68 Hz. 60.0 -. 59.9 -. B. 1200 MW/ dHz. 59.8 -. 59.7 -. C. 59.6 -. Detuned to 840 MW/ dHz. L/O 2 PV (net 2740 MW) B: 59.68 Hz C: 59.56 Hz. 60.0 -.

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IFRO Testing - WECC

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  1. IFRO Testing - WECC Summary of Results Eric H. Allen – NERC

  2. WECC 2012-13LW2 Case L/O 2 PV (net 2740 MW) B: 59.78 Hz C: 59.68 Hz 60.0 - 59.9 - B 1200 MW/dHz 59.8 - 59.7 - C 59.6 -

  3. Detuned to 840 MW/dHz L/O 2 PV (net 2740 MW) B: 59.68 Hz C: 59.56 Hz 60.0 - 59.9 - 59.8 - B 59.7 - 59.6 - C

  4. NERC FRI Report • Recommended Interconnection Frequency Response Obligations (IFRO): • Eastern: 1,002 MW/dHz • Western: 840 MW/dHz • Texas: 286 MW/dHz • Quebec: 179 MW/dHz • At 840 MW/dHz, frequency in Western Interconnection is indicated to remain above UFLS threshold of 59.5 Hz following L/O 2 Palo Verde units

  5. Caveat Emptor • However, frequency behavior is dependent on the composition of the frequency response • A single MW/dHz number is insufficient to adequately characterize the frequency response in an interconnection • Some units have “squelched” (unsustained) response • Units that do respond can run out of headroom

  6. Questions?

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