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ERCOT's Recommendations for WGR Ramp Rate Limitations

ERCOT discusses NPRR-460 and proposes a per-minute ramp-rate limitation of 20% for WGRs, with a maximum ramp rate capped at 25%. Increasing ramp-rate limitations may increase the need for Regulation Service and Primary Frequency Response.

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ERCOT's Recommendations for WGR Ramp Rate Limitations

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  1. Discuss ERCOT comments on NPRR-460

  2. Summary of ERCOT 08-16-2012 comments The current NPRR 460 language does not limit WGRs to 20% ramp rate limitation The measure on whether the WGRs followed the 20% ramp-rate limitation is based on 5 minute average ramp-rate If a WGR ramps to 100% in 30 seconds, the average ramp-rate would still not exceed 20% for the five minute SCED interval ERCOT therefore recommends that WGRs follow a per minute ramp-rate limitation of 20% of the installed capacity. However, given the possibility described below, ERCOT proposes that the maximum ramp rate in a single minute be capped at 25%. WGR control systems may not have the ability to limit ramp rate to precisely 20% in all one-minute intervals. When WGR control system is set to a 20% per minute ramp-rate limitation, physical factors beyond the control of the operator may cause the generator to momentarily exceed the 20% per minute ramp rate. ERCOT Public

  3. Summary of ERCOT 08-16-2012 comments Increasing the ramp-rate limitation to 20% may increase the need to deploy Regulation Service and Primary Frequency Response WGRs have high ramp-rate, and are capable of reaching 100% of their installed capacity in less than a minute. Conventional generators are ramping to the SCED base-point over the full SCED interval (UDBP) Depending on the magnitude of curtailment, this imbalance may cause ERCOT to deploy Regulation and Primary Frequency Response to activate Example: with a 20% ramp limitation, a WGR previously curtailed to 60% of its HSL can reach its SCED base-point in 2 minutes compared to 4 minutes that other conventional Resources would generally take to reach their SCED base-point ERCOT Public

  4. Partially curtailed WGRs responding to SCED BP (curtailment) ERCOT Public

  5. Partially curtailed WGRs released form curtailment ERCOT Public

  6. No instantaneous imbalance, if all Resources ramps over entire SCED interval ERCOT Public

  7. Questions ???

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