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Meeting Summary - 09/16/24 IBRWG Meeting

Grid Monitor AI
09/18/2024

<img src="/storage/docs/2024/09/20240916IBRWGHero.png" width="871" height="672" /> 1 - Antitrust Admonition Julia Matevosyan <a href="/sharing/?token=c99c9a45-1744-42ec-aafb-44afa083fe13">2</a> - DWG Procedure Manual S.-W. Kang <ul> <li style="font-weight: 400;" aria-level="1">ERCOT appreciates stakeholder support and addressed all comments on the DWG precision manuals.</li> <li style="font-weight: 400;" aria-level="1">Draft DWG procedure manual posted on DWG website.</li> <li style="font-weight: 400;" aria-level="1">PUCT decision on NPRR245 expected in September; effective date likely October 1.</li> <li style="font-weight: 400;" aria-level="1">ROS approval sought on October 3, previously planned for September.</li> <li style="font-weight: 400;" aria-level="1">Updated DWG manual available on the website as a draft for familiarization.</li> <li style="font-weight: 400;" aria-level="1">ERCOT updated PMV and DMV tools for NPRR245 writethrough test.</li> <li style="font-weight: 400;" aria-level="1">Tools are linked in previous meeting presentations and ERCOT model quality guide.</li> <li style="font-weight: 400;" aria-level="1">Confirmations received from Jonathan on PMV and DMV tool updates with latest NOGRR245 test proposals.</li> </ul> <a href="/sharing/?token=fe894bd9-56e0-4715-bbfa-bc319d168d68">3</a> - NERC Standards Update FERC Order 901 M. Henry TRE <ul> <li style="font-weight: 400;" aria-level="1">Brief <a href="https://ercot-control-docs.s3.us-west-2.amazonaws.com/13/240912%2520NERC%2520901%2520IBR%2520Stds%2520Update.pdf">update</a> on NERC standards related to FERC order 901</li> <li style="font-weight: 400;" aria-level="1">FERC directives to NERC in October 2023 to address IBR integration challenges</li> <li style="font-weight: 400;" aria-level="1">Four focus areas: data sharing, model validation, planning, operational studies, IVR performance requirements</li> <li style="font-weight: 400;" aria-level="1">Milestone 2 projects to be completed by November 4</li> <li style="font-weight: 400;" aria-level="1">Three projects involved in Milestone 2</li> <li style="font-weight: 400;" aria-level="1">Details on the first project: Disturbance monitoring equipment (2021-04) leading to PRC-028-1 standard</li> <li style="font-weight: 400;" aria-level="1">PRC-024 version 5 IBR-related material moved to PRC-029, consensus issues</li> <li style="font-weight: 400;" aria-level="1">Technical Conference held by NERC to gather feedback on PRC-029</li> <li style="font-weight: 400;" aria-level="1">Workshop findings: difficulty meeting requirements with older equipment, technical challenges, and OEM feedback</li> <li style="font-weight: 400;" aria-level="1">New standard PRC-030 asking entities to evaluate and mitigate issues</li> <li style="font-weight: 400;" aria-level="1">New standards expected to be issued for final ballot</li> <li style="font-weight: 400;" aria-level="1">NERC board may step in if consensus is not reached</li> </ul> Questions Asked: <ul> <li style="font-weight: 400;" aria-level="1">Name: John Schmall Question: Who is responsible for drafting the revised standard for PRC-029? Answer: NERC staff most likely driving it with the standards committee.</li> <li style="font-weight: 400;" aria-level="1">Name: Ken Donohoo Question: Clarification on proposed standards exceeding IEEE 2800 and concerns over legacy equipment Answer: Acknowledgment that proposed standards go beyond IEEE 2800; consideration for legacy equipment being discussed.</li> </ul> Next Steps: <ul> <li style="font-weight: 400;" aria-level="1">NERC to issue new standard for ballot with a quick turnaround</li> <li style="font-weight: 400;" aria-level="1">Further outreach and discussions to address concerns</li> <li style="font-weight: 400;" aria-level="1">Update on implementation timelines after FERC approval</li> </ul> <a href="/sharing/?token=b4fa9af6-99db-4664-ae9e-e9545df043a6">4</a> - Draft Proposal for Advanced Grid Support Energy Storage Resource F. Huang ERCOT <ul> <li style="font-weight: 400;" aria-level="1">Fred Huang from ERCOT provided an update on a planned revision request.</li> <li style="font-weight: 400;" aria-level="1">Three key documents were posted: draft NOGRR, draft PGRR, and the pace framework report.</li> <li style="font-weight: 400;" aria-level="1">Electronics consultant recommended eleven tests for gridforming technology; narrowed down to seven proposed test requirements.</li> <li style="font-weight: 400;" aria-level="1">Potential impact on the grid includes improved system voltage and frequency response during events, and increased stability in areas with advanced grid support energy storage.</li> <li style="font-weight: 400;" aria-level="1">The proposal mainly focuses on energy storage resources currently but may extend to other inverter-based resources like wind and solar in the future.</li> <li style="font-weight: 400;" aria-level="1">ERCOT aims to reinforce system reliability and support, responding to the growing penetration of inverter-based resources.</li> <li style="font-weight: 400;" aria-level="1">New requirements will apply to energy storage with SGIS agreements signed on or after April 1, 2025.</li> <li style="font-weight: 400;" aria-level="1">Seven model quality tests to be introduced for energy storage resources to assess and verify advanced grid support.</li> <li style="font-weight: 400;" aria-level="1">The proposed tests include:</li> <ul> <li style="font-weight: 400;" aria-level="2">Flat start test</li> <li style="font-weight: 400;" aria-level="2">Small voltage disturbance test</li> <li style="font-weight: 400;" aria-level="2">Large voltage disturbance test</li> <li style="font-weight: 400;" aria-level="2">Frequency change and inertia response test</li> <li style="font-weight: 400;" aria-level="2">System strength test</li> <li style="font-weight: 400;" aria-level="2">Phase angle jump test</li> <li style="font-weight: 400;" aria-level="2">Loss of synchronous machine test</li> </ul> <li style="font-weight: 400;" aria-level="1">The pace framework report elaborates on the functional specifications and the setup for the seven proposed tests.</li> <li style="font-weight: 400;" aria-level="1">Future directions include exploring similar requirements for wind and solar resources.</li> <li style="font-weight: 400;" aria-level="1">Further details may be presented in a work session in the next IBR working group meeting.</li> <li style="font-weight: 400;" aria-level="1">Stakeholders are encouraged to provide feedback before formal submission in October.</li> </ul> <a href="/sharing/?token=9c81d642-1b5b-4b7c-956a-43032f221bdf">5</a> - PFR from IBRs under “Deep” Curtailment M. Cova Acosta Vestas, Nick Miller Hickory Ledge, All <ul> <li style="font-weight: 400;" aria-level="1">Miguel Acosta from Vestas highlighted key concerns regarding primary frequency response (PFR) from IBRs during deep curtailment.</li> <li style="font-weight: 400;" aria-level="1">Current frequency response standards like BAL TRE and its four defined zones were discussed.</li> <li style="font-weight: 400;" aria-level="1">Main issues identified: IBRs' failure to respond to under-frequency events when high curtailment or no power production exists.</li> <li style="font-weight: 400;" aria-level="1">Explanation of turbine operations during full curtailment and the time it takes to resume active power production.</li> <li style="font-weight: 400;" aria-level="1">ERCOT's expectation is for primary frequency response within 16-60 seconds, which isn't met by turbines in a fully stopped state.</li> <li style="font-weight: 400;" aria-level="1">Miguel suggested two solutions: listing this situation as an exemption and creating realistic expectations for turbine capabilities in centralized systems.</li> <li style="font-weight: 400;" aria-level="1">Potential improvement with realistic telemetry data to facilitate grid operator expectations.</li> <li style="font-weight: 400;" aria-level="1">Nick Miller and other participants discussed the impact of NTON/NTOFF telemetry in relation to turbine readiness and its effect on grid support during frequency events.</li> <li style="font-weight: 400;" aria-level="1">The impact of mechanical wear and tear due to frequent start-stop cycles of turbines was highlighted.</li> <li style="font-weight: 400;" aria-level="1">A second limitation discussed was the technical minimum operating points and the need to configure plants to avoid turbines frequently pausing and restarting due to minor frequency deviations.</li> <li style="font-weight: 400;" aria-level="1">Potential solutions include setting a low sustained limit above zero or implementing filtering mechanisms to handle small frequency deviations.</li> <li style="font-weight: 400;" aria-level="1">Need for understanding how other OEMs handle frequency sampling and the importance of forums for open discussion.</li> <li style="font-weight: 400;" aria-level="1">A final enhancement suggestion to improve IBR response, focusing on faster response capability and lack of inertia in IBRs.</li> <li style="font-weight: 400;" aria-level="1">Questions from participants covered issues such as commercial considerations, impact on models, and specific vendor differentiation.</li> </ul> <a href="/sharing/?token=e6ecf5d3-16b5-4080-a84e-d01446fdec10">6</a> - NOGRR245 Update S. Solis ERCOT <ul> <li style="font-weight: 400;" aria-level="1">NOGRR245 is expected to be reviewed by the commission this month, with hopes for approval.</li> <li style="font-weight: 400;" aria-level="1">One of the commissioners had previously commented on monitoring NERC activities. Conversations with FERC staff about timelines were also noted.</li> <li style="font-weight: 400;" aria-level="1">If regional needs exceed NERC standards, it's acceptable. There's a history of avoiding duplication of NERC rules but adapting them to meet ERCOT region requirements.</li> <li style="font-weight: 400;" aria-level="1">Internal drafts exist. Feedback from the commission will shape the next set of language. A new NOGRR will be submitted soon after approval.</li> <li style="font-weight: 400;" aria-level="1">Discussions will likely be held in the IBRWG for a month, but crucial conversations will occur in ROS and TAC forums.</li> <li style="font-weight: 400;" aria-level="1">Updates will be provided monthly to the IBRWG to keep all parties informed of developments. </li> </ul> <a href="/sharing/?token=28f50df5-5c1c-4dc4-8ec6-01e306dddc1a">7</a> - RoCoF and Phase Jump Measurement Discussion M. Cova Acosta Vestas, S. Solis ERCOT, All <ul> <li style="font-weight: 400;" aria-level="1">Discussed the importance of measurement methods for Rate of Change of Frequency (RoCoF) and phase angle jumps for determining protection system responses.</li> <li style="font-weight: 400;" aria-level="1">Previous presentations and literature indicate that measurements during transients/faults may not be reliable for RoCoF monitoring and tripping.</li> <li style="font-weight: 400;" aria-level="1">IEEE 2800 suggests an averaging window of at least 0.1 seconds, but recent events showed this might not be sufficient.</li> <li style="font-weight: 400;" aria-level="1">Discussion on adopting an appropriate averaging window for the region, with ERCOT suggesting 0.5 seconds.</li> <li style="font-weight: 400;" aria-level="1">Highlighted that phase angle jumps should not trip during faults and require a different consideration for averaging windows.</li> <li style="font-weight: 400;" aria-level="1">Lacking feedback from generator owners, prompting further discussions and feedback collection.</li> <li style="font-weight: 400;" aria-level="1">Vestas shared their internal process for frequency calculation using LabVIEW software, highlighting the need to understand different measurement methods.</li> <li style="font-weight: 400;" aria-level="1">Concerns raised about moving averaging windows and how different calculation methods might affect RoCoF measurements and subsequent actions.</li> <li style="font-weight: 400;" aria-level="1">Emphasis on standardizing methods for calculating frequency and RoCoF to avoid different measurement expectations and improve coordination.</li> <li style="font-weight: 400;" aria-level="1">Understanding how frequency readings are processed from instantaneous waveforms is critical before determining new standards.</li> <li style="font-weight: 400;" aria-level="1">Comments on practical difficulties related to aligning different manufacturers' measurement methods.</li> <li style="font-weight: 400;" aria-level="1">Suggestion for OEMs to align with ERCOT's measurement methods to ensure consistent communication and compliance.</li> <li style="font-weight: 400;" aria-level="1">Need for transparency in methodology used by ERCOT for its RoCoF conclusions based on available PMU data.</li> <li style="font-weight: 400;" aria-level="1">Discussion on the potential pros and cons of extending or reducing the moving average filter window.</li> <li style="font-weight: 400;" aria-level="1">Importance of standardized methodologies to avoid discrepancies and ensure accurate RoCoF measurements across different equipment.</li> <li style="font-weight: 400;" aria-level="1">Planning a working session to further discuss and define methodologies and implementations for consistent measurement standards.</li> <li style="font-weight: 400;" aria-level="1">Acknowledgment of the need to progress towards solutions in a timely manner to align with implementation timelines.</li> </ul> 9 - Adjourn <ul> <li style="font-weight: 400;" aria-level="1"> </li> </ul>