ERCOT's NPRR 1128 Proposal for Fast Frequency Response Procurement
ERCOT's NPRR 1128 proposes setting a minimum price for Fast Frequency Response (FFR) Ancillary Service offers to ensure efficient procurement up to the current FFR limits. This strategy aims to enhance grid reliability by leveraging FFR capabilities during low inertia conditions, ultimately reducing the need for additional resources and improving system resilience in critical scenarios like the February 2021 Winter Storm event. The proposal recommends identifying optimal hours for FFR deployment based on past inertia data, emphasizing the significance of timely and sustained response capabilities for grid stability.
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Presentation Transcript
NPRR 1128 ON FFR PROCUREMENT Balancing Operations Planning PDCWG JUNE 16, 2022
Background NPRR 1128, proposes that Fast Frequency Response (FFR) Ancillary Service Offer price may not be less than -$0.01 per MW. This will allow FFR procurement up to the current FFR limit without proration. FFR triggers at 59.85 Hz, provides response within 15 cycles and for a single event, resource providing FFR must be capable of sustaining response for at least 15 minutes. During low inertia conditions, especially when the system inertia is below 250 GW sec, faster and earlier response from FFR will reduce ERCOT s Critical Inertia and the amount of RRS needed in those hours. Under today s setup, if 450 MW of FFR is available, Critical Inertia during hours with low inertia conditions will reduce by around 8-10 GW.s. Average RRS reduction for 2022 would be around 50 MW 75 MW. Also worth noting is that during tight operating conditions and long drawn events like February 2021 Winter Storm event, due to its duration limited nature, FFR if deployed, may not be available after some time. During similar conditions, Load Resources providing RRS using under frequency relays (RRS-UFR) if deployed, are required to stay deployed till recalled. Hence, ERCOT recommends revising NPRR1128 to adopting an approach wherein preference for FFR is limited to the hours/months wherein FFR is most effective in meeting reliability needs. PUBLIC 2
Potential Approach for Identifying Hours with low inertia The hours marked in red color below identify hours during which 75thpercentile of the system inertia for the same hour of each month in past 3 years was less than 250 GW sec. Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec HE1 HE2 HE3 HE4 HE5 HE6 HE7 HE8 HE9 HE10 HE11 HE12 HE13 HE14 HE15 HE16 HE17 HE18 HE19 HE20 HE21 HE22 HE23 HE24 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 1 0 0 1 1 1 1 1 1 0 1 1 1 1 1 3 PUBLIC 3
References Whitepaper, Inertia: Basic Concepts and Impacts on the ERCOT Grid NPRR863 ERCOT December 6, 2018 Comments | Link PDCWG | Aug 11, 2021 | Winter Event 2021 PDCWG 08112021 v2 FFR Advancement Workshop | Oct 27, 2021 | Link 4 PUBLIC 4
