ERCOT Operations Update on Large Flexible Load Task Force
Stay informed about the latest developments and internal discussions at ERCOT regarding operational requirements and impacts of large flexible loads. Explore details on technical requirements, load forecasting changes, recent ride-through events, and considerations for voltage control. Follow along as ERCOT addresses key issues to enhance grid reliability and stability.
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Presentation Transcript
Update on Operations- Related Items Jeff Billo Operations ERCOT Large Flexible Load Task Force February 17, 2023 ERCOT Public
Items under discussion internally at ERCOT LFL-32: Identify technical requirements for ramp-rate limitations. Current thinking: CLRs will have a ramp-rate limitation of 20%/minute to align with SCED interval. Everything else will need a significantly slower limitation to mitigate reliability impact. Could have different limitations for ramping down (less risk) and ramping up (more risk). See October LFLTF presentation: https://www.ercot.com/files/docs/2022/10/21/LFLTF_Operations_R equirements_Oct2022.pptx LFL-45: Identify impacts to load forecasting and consider what process changes are necessary to incorporate LFL. Current thinking: develop hourly LFL forecast model based on predicted prices and incorporate results into operational load forecast models. Price Forecast LFL Forecast MTLF 2 PUBLIC
Items under discussion internally at ERCOT LFL-46: Consider impact of large flexible loads tripping in light-load conditions. Main impact may be to frequency stability due to simultaneous tripping for a ride-through event. Recent Ride-Through Events (1/2): October 12, 2022, 05:56 Load Loss Event initiated by multiple faults at a 345-kV substation in West Texas ~415 MW of load reduction in West Texas due to low voltage Frequency spiked to 60.086 Hz October 31, 2022, 12:12 - Load Loss Event initiated by multiple faults at a 345/138-kV substation in the DFW area ~500 MW of load reduction throughout the system due to low voltage Frequency spiked to 60.132 Hz ~869 MW of thermal generation loss at two plants 3 PUBLIC
Items under discussion internally at ERCOT Recent Ride-Through Events (2/2): December 7, 2022, 03:50 Load Loss Event initiated by multiple faults at a 138-kV substation in West Texas ~1,560 MW of load reduction in West Texas Frequency spiked to 60.235 Hz ~112 MW of thermal generation loss at two plants January 23, 2023, 12:19 IBR and Load Loss Event initiated by a normally-cleared fault on a 138-kV line in West Texas ~298 MW of solar generation loss at 8 plants ~208 MW of load reduction at four Large Flexible Load (LFL) sites Event is still under investigation Voltage ride-through reductions at large loads is an emerging issue. 4 PUBLIC
Other items LFL-36: Determine if and how LFL should be taken into account in the AS methodology, including any site-specific maximum limit. Protocol 3.16(2): ERCOT shall, at least annually, determine with supporting data, the methodology for determining the quantity requirements for each Ancillary Service needed for reliability ERCOT will bring any potential methodology changes necessary to account for LFLs to stakeholders as part of the normal AS methodology review process. Recommend marking this item as closed. LFL-47: Consider voltage control / voltage stability impacts of LFL interval behavior. Separate presentation at this meeting. 5 PUBLIC
