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Proposed ERCOT Nodal AGC Framework

Explore the innovative ERCOT Nodal AGC Framework proposed by Bob Green from Garland Power and Light Co. on January 3, 2007. Key features include SCED Base Points following daily load profiles and REG and RRS deployments following frequency profiles, with NSRS providing capacity to SCED based on operator judgment. Discover the challenges and solutions for achieving optimal frequency control and unit coordination in the ERCOT system.

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Proposed ERCOT Nodal AGC Framework

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  1. Proposed ERCOT Nodal AGC Framework Bob Green Garland Power and Light Co. January 3, 2007

  2. Key Features • SCED Base Points follow the daily load profile (5 minute update) • REG and RRS deployments follow the frequency profile (4 second update) • NSRS provides generation capacity to SCED based on operator judgment

  3. Frequency will not be equal to 60 HZ because: • The sum of the governor 60 HZ Set Points is not equal to the ERCOT load • Real time load is different from the value dispatched in SCED • Units are not following control base points • Time lags and ramp limits in the AGC process • Unit trip(s)

  4. Problems with adding RRS deployment to the SCED input • Will cause frequency overshoot and reverse direction REG • Will probably cause units not bidding RRS to receive higher SCED Base Points

  5. Changes required in the Nodal Protocols • Delete 6.5.7.6.2.2 (9) • Modify 8.1.2.4.2 (1)

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