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Meeting Summary - 10/11/2024 IBRWG Meeting

Grid Monitor AI
10/11/2024

<h2><img src="/storage/docs/2024/10/IBRWG_Meeting_10112024_Hero.png" width="953" height="714" /></h2> <h2><a href="https://dash3.gridmonitor.com/sharing/?token=01d85b2d-9a0e-4db0-b2f2-c0a691e496c6">1</a> - Antitrust Admonition - Julia Matevosyan</h2> <ul> <li style="font-weight: 400;" aria-level="1">Antitrust admonition was shared with meeting participants.</li> </ul> <h2><a href="https://dash3.gridmonitor.com/sharing/?token=e4803e59-02ce-4707-9376-871a590c5034">2</a> - SSR/SSFR Best Practices - Anuradha Dissanayaka, Andrew Isaacs - Electranix</h2> <ul> <li style="font-weight: 400;" aria-level="1">Introduction of Anuradha Dissanayaka, Electranix engineer leading SSO studies.</li> <li style="font-weight: 400;" aria-level="1">Overview of Sub-Synchronous Oscillations (SSO) including historical events and impacts: Mojave generator SSR event in the 1970s and south Texas SSCI event in 2009.</li> <li style="font-weight: 400;" aria-level="1">Importance of detailed studies for IBR plants near series capacitors before commissioning to prevent issues.</li> <li style="font-weight: 400;" aria-level="1">Explanation of various sub-synchronous phenomena: SSR, SSTI, SSCI, SSFR.</li> <li style="font-weight: 400;" aria-level="1">Description of study processes: Screening (passive and dynamic frequency scanning) and detailed EMT simulations.</li> <li style="font-weight: 400;" aria-level="1">Challenge of modeling accurate systems and the back-and-forth required with OEMs to complete studies.</li> <li style="font-weight: 400;" aria-level="1">Importance of accurately modeling transformer saturation to prevent SSFR (Sub-Synchronous Ferro Resonance).</li> <li style="font-weight: 400;" aria-level="1">Discussion on the problems of adding new series capacitors in areas with high IBR penetration.</li> <li style="font-weight: 400;" aria-level="1">Sensitivity studies and control tuning as solutions for various sub-synchronous issues.</li> <li style="font-weight: 400;" aria-level="1">Potential of grid-forming battery energy storage systems (BESS) to improve damping and minimize risks.</li> <li style="font-weight: 400;" aria-level="1">Application of SSR and SSFR detection relays to manage certain phenomena.</li> <li style="font-weight: 400;" aria-level="1">Recent findings about grid-forming BESS providing positive damping over a wide frequency range.</li> </ul> <h2><a href="https://dash3.gridmonitor.com/sharing/?token=09a98bf7-f0a8-4863-ab1f-65315ed536d0">3</a> - PFR from IBRs under “Deep” Curtailment - Scott Karpiel - SMA, All</h2> <a href="https://ercot-control-docs.s3.us-west-2.amazonaws.com/04/ERCOT%2520PFR%2520sma11Oct2025.pdf">ERCOT PFR sma11Oct2025</a> <a href="/storage/docs/2024/10/PV_Inverter_OEM_PFR_Capability_Under_Curtailment_20241011.pdf">PV_Inverter_OEM_PFR_Capability_Under_Curtailment_20241011.pdf</a> <ul> <li style="font-weight: 400;" aria-level="1">Discussion on the ability of inverter-based resources (IBR) to provide primary frequency response (PFR) under deep curtailment.</li> <li style="font-weight: 400;" aria-level="1">SMA inverters can respond in less than 150 milliseconds, but are limited by the accuracy of measurement devices and plant controller processing time.</li> <li style="font-weight: 400;" aria-level="1">Photovoltaic (PV) resources operate at maximum power points and may not increase AC power to respond to frequency events if curtailed to zero.</li> <li style="font-weight: 400;" aria-level="1">IBR units are not ideal for frequency response compared to hybrid systems with battery energy storage systems (BESS).</li> <li style="font-weight: 400;" aria-level="1">A question was raised about SMA inverters' ability to respond when curtailed to zero with adequate irradiance.</li> <li style="font-weight: 400;" aria-level="1">Scott emphasized the role of the plant controller in ensuring the inverter can increase active power quickly during low-frequency events.</li> <li style="font-weight: 400;" aria-level="1">Discussion on the use of weather stations and algorithms to estimate the available power for frequency response, acknowledging it as challenging.</li> <li style="font-weight: 400;" aria-level="1">Questions regarding the accuracy, model performance under low dispatch, and potential discrepancies in model behavior were addressed.</li> <li style="font-weight: 400;" aria-level="1">The discussion included how curtailment affects the high sustained limit (HSL) reported to ERCOT and the estimation of available capacity.</li> <li style="font-weight: 400;" aria-level="1">Clarification that plant controllers can perform ongoing measurements crucial for frequency response, with the role of the PPC in providing grid frequency data.</li> </ul> <h2><a href="https://dash3.gridmonitor.com/sharing/?token=2ebced3c-a667-4c12-9885-c2dbe5fc8bb0">4</a> - NOGRR245 and NOGRR255 Updates - Stephen Solis - ERCOT</h2> <a href="/storage/docs/2024/10/NOGRR245_255_Update_IBRWG_10112024.pdf">NOGRR245_255_Update_IBRWG_10112024.pdf</a> <ul> <li style="font-weight: 400;" aria-level="1">NOGRR245 was recently approved, effective October 1, 2024; changes to guides and language in process details provided.</li> <li style="font-weight: 400;" aria-level="1">Performance requirements from NOGRR245 become effective after entities enhance ride-through capabilities; coordination activities are ongoing.</li> <li style="font-weight: 400;" aria-level="1">Model quality testing procedures updated in DWG procedure manual, approved by Reliability and Operations subcommittee.</li> <li style="font-weight: 400;" aria-level="1">NOGRR245 includes specific steps for handling performance failures, such as investigation, reporting, and model validation.</li> <li style="font-weight: 400;" aria-level="1">NOGRR255, effective August 1, 2024, aligns with PRC-028, focusing on disturbance monitoring equipment and data retention requirements.</li> <li style="font-weight: 400;" aria-level="1">NOGRR255 introduces timelines for resource compliance and site selection for monitoring equipment installations.</li> <li style="font-weight: 400;" aria-level="1">FAQs on NOGRR255 clarified language issues and requirements for disturbance monitoring at plant level versus individual inverters or turbines.</li> <li style="font-weight: 400;" aria-level="1">Discussion on monitoring equipment emphasized root cause analysis importance and advisory on utilizing existing equipment.</li> <li style="font-weight: 400;" aria-level="1">Future updates to NOGRR255 depend on outcomes from FERC directions and ongoing performance assessments.</li> </ul> <h2><a href="https://dash3.gridmonitor.com/sharing/?token=161b097b-5b5b-4cb8-9eae-81d1c516cb7d">5</a> - NERC Standards Update - PRC-029 - TRE</h2> <a href="/storage/docs/2024/10/20241011_Update_to_IBRWG.pdf">20241011_Update_to_IBRWG.pdf</a> <ul> <li style="font-weight: 400;" aria-level="1">Rachel Coyne presented updates in place of Mark Henry.</li> <li style="font-weight: 400;" aria-level="1">Activity around PRC-029 related to milestone two for FERC Order 901 was discussed.</li> <li style="font-weight: 400;" aria-level="1">PRC-029 caused industry disagreements; NERC invoked rules of procedure, section 321.</li> <li style="font-weight: 400;" aria-level="1">A technical conference was held in September to build consensus with OEM participation.</li> <li style="font-weight: 400;" aria-level="1">Changes to PRC-029 include updating the ride-through definition and modifying requirements three and four.</li> <li style="font-weight: 400;" aria-level="1">PRC-029 passed with 77.88% support; other standards in milestone two also passed.</li> <li style="font-weight: 400;" aria-level="1">Standards to be filed with FERC by November 4.</li> <li style="font-weight: 400;" aria-level="1">Update on regional standard bow one TRE version two project SAR-013 was given.</li> <li style="font-weight: 400;" aria-level="1">Scope of SAR includes provisions on governor generator deadband, rules of GOBA and CEA roles, and PFR performance for battery energy storage.</li> <li style="font-weight: 400;" aria-level="1">Project approved by Texas RE MRC on September 18, and standard drafting team solicitations concluded.</li> <li style="font-weight: 400;" aria-level="1">Next step is for MRC to approve slate and start drafting the next revision of that standard</li> <li style="font-weight: 400;" aria-level="1">Consensus reached, particularly on requirement three concerning the broad band of frequency operational range.</li> <li style="font-weight: 400;" aria-level="1">Continued discussions on PFR response limitations, especially for IBR, beyond OEM capabilities.</li> </ul> <h2><a href="https://dash3.gridmonitor.com/sharing/?token=9a09781a-d9a1-48c7-80d5-389eab583497">6</a> - Other Industry Updates - Julia Matevosyan ESIG</h2> <a href="/storage/docs/2024/10/ERCOT_IBRWG_NERC_and_Other_Updates_101024.pdf">ERCOT_IBRWG_NERC_and_Other_Updates_101024.pdf</a> <ul> <li style="font-weight: 400;" aria-level="1">Series of grid forming seminars will include six sessions with various presenters from ISOs, utilities, NERC.</li> <li style="font-weight: 400;" aria-level="1">Registration for the seminars will be available on the IBR working group's presentation.</li> <li style="font-weight: 400;" aria-level="1">The I2X meeting is scheduled for October 24 in Providence and will be a hybrid meeting.</li> <li style="font-weight: 400;" aria-level="1">The meeting is sponsored by the Department of Energy and involves the I2X Interconnection Innovation Change.</li> <li style="font-weight: 400;" aria-level="1">The I2X meeting will be combined with a workshop with numerous presentations over two days.</li> <li style="font-weight: 400;" aria-level="1">Registration will be available online for the seminar series and the webinar in mid-October on grid funding projects.</li> </ul> <h2>6.1 - Lunch Break</h2> <ul> <li style="font-weight: 400;" aria-level="1">Meeting paused for a 30-minute lunch break.</li> </ul> <h2><a href="https://dash3.gridmonitor.com/sharing/?token=6b89ce7e-cf70-489e-88cc-faff5a82296f">7</a> - AGS ESR Model Quality Tests and Discussion - Poria Astero, Sun Wook Kang - ERCOT</h2> <a href="https://ercot-control-docs.s3.us-west-2.amazonaws.com/09/ERCOT%2520AGS-ESR%2520Oct-11-2024%2520IBRWG.pdf">ERCOT AGS-ESR Oct-11-2024 IBRWG</a> <ul> <li style="font-weight: 400;" aria-level="1">Discussed ERCOT recommendations on advanced grid support inverter-based energy storage resource (AGS ESR) test requirements.</li> <li style="font-weight: 400;" aria-level="1">Sun Wook Kang emphasized the importance of the effort due to the increasing presence of inverter-based resources (IBRs) and decreased availability of conventional units for maintaining grid reliability.</li> <li style="font-weight: 400;" aria-level="1">Highlighted key efforts like synchronous condenser projects, PGRR109 improvement, and NOGRR245 approval for better IBR operating requirements.</li> <li style="font-weight: 400;" aria-level="1">Electranix contracted in 2023 to support the development of functional specifications and test framework for AGS ESR.</li> <li style="font-weight: 400;" aria-level="1">Presentation of interconnection requests showed a 93% IBR and 42% battery projects focus as of August 2024.</li> <li style="font-weight: 400;" aria-level="1">Battery resources are seen as increasingly important for ERCOT and are capable of software updates for grid support (GFM capability).</li> <li style="font-weight: 400;" aria-level="1">Expectation that AGS ESR will improve grid stability and system strengths, while reducing impact of disturbances.</li> <li style="font-weight: 400;" aria-level="1">Plans to submit PGRR and NOGRR by year-end, involving stakeholder feedback on test requirements.</li> <li style="font-weight: 400;" aria-level="1">Poria Astero outlined detailed AGS ESR test framework including site-specific model quality and unit model validation tests.</li> <li style="font-weight: 400;" aria-level="1">Test Bench setups explained: Test Bench 1 with impedance to model grid stress, Test Bench 2 for islanded operation.</li> <li style="font-weight: 400;" aria-level="1">Several test scenarios discussed involving stability under phase angle jumps, voltage disturbances, and frequency changes.</li> <li style="font-weight: 400;" aria-level="1">Presentation emphasized reactive power following voltage changes, inertial response during frequency changes, and system SRF </li> <li style="font-weight: 400;" aria-level="1">AGS ESR test requirements considered grid-following and grid-forming characteristics.</li> <li style="font-weight: 400;" aria-level="1">Existing large voltage disturbance test and a modified loss of synchronous machine test to ensure parallel operation capability.</li> <li style="font-weight: 400;" aria-level="1">Acknowledged further test suggestions from Electranix, with a focus on necessary tests for AGS ESR adoption.</li> <li style="font-weight: 400;" aria-level="1">Focus on ongoing collaboration with stakeholders, manufacturers for test validation and feedback.</li> </ul> <h2>8 - Other Business</h2> <ul> <li style="font-weight: 400;" aria-level="1">Not Discussed</li> </ul> <h2><a href="https://dash3.gridmonitor.com/sharing/?token=3d684165-8a3d-485e-ad66-efe4fa6e918c">9</a> - Adjourn - All</h2>