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Meeting Summary - 07/12/24 IBRWG Meeting

Grid Monitor AI
07/15/2024

1 - Antitrust Admonition - Julia Matevosyan <a href="https://dash3.gridmonitor.com/sharing/?token=61f9438e-07de-4e42-a2eb-7c11ccd8640f" target="_blank" rel="noopener">2</a> - Preliminary Advanced Grid Support Inverter-Based ESR Functional Specification and Test Framework - ERCOT/Electranix - Fred Huang <ul> <li style="font-weight: 400;" aria-level="1">Update on status from a few months ago; Electranix contracted as SME consultants.</li> <li style="font-weight: 400;" aria-level="1">Project aims to identify capabilities, performance, and test framework for grid forming technologies suitable for ERCOT.</li> <li style="font-weight: 400;" aria-level="1">Collaboration with Electranix; Andrew from Electranix to present the project's summary.</li> <li style="font-weight: 400;" aria-level="1">ERCOT staff working in parallel on assessment from the grid's stability and performance perspective.</li> <li style="font-weight: 400;" aria-level="1">Discussion on adoption of new technology/features in the ERCOT grid.</li> </ul> <a href="https://dash3.gridmonitor.com/sharing/?token=313284da-80a0-4326-993f-a373f38197c1" target="_blank" rel="noopener">2.1</a> - Advanced Grid Support BESS Functional Specification and Test Protocol - Andrew Isaacs <ul> <li style="font-weight: 400;" aria-level="1">Introduction</li> <ul> <li style="font-weight: 400;" aria-level="2"><a href="https://ercot-control-docs.s3.us-west-2.amazonaws.com/09/2024_07_ERCOT_IBRWG_Advanced%2520Grid%2520Support%2520Inverter-Based%2520ESR%2520Functional%2520Specification%2520and%2520Test%2520Framework.pdf" target="_blank" rel="noopener">Presentation</a> by Andrew Isaacs</li> <li style="font-weight: 400;" aria-level="2">Collaborative effort between consultants and the ERCOT team.</li> <li style="font-weight: 400;" aria-level="2">Focus on testing grid forming battery energy storage systems (BESS).</li> </ul> <li style="font-weight: 400;" aria-level="1">Grid Forming Battery Technology</li> <ul> <li style="font-weight: 400;" aria-level="2">Technical functional specification and test framework developed.</li> <li style="font-weight: 400;" aria-level="2">Four EMT models from commercial devices extensively tested.</li> <li style="font-weight: 400;" aria-level="2">Functional definition and specification approach, avoiding specific control topologies.</li> </ul> <li style="font-weight: 400;" aria-level="1">Project Team and Background</li> <ul> <li style="font-weight: 400;" aria-level="2">Involved engineers from both consulting and ERCOT sides.</li> <li style="font-weight: 400;" aria-level="2">Team members from operations, planning, and ERCOT personnel acknowledged.</li> <li style="font-weight: 400;" aria-level="2">Previous experience with grid forming specification since 2021.</li> </ul> <li style="font-weight: 400;" aria-level="1">Grid Forming vs. Grid Following</li> <ul> <li style="font-weight: 400;" aria-level="2">Explanation of grid forming as maintaining a constant voltage phaser at the inverter terminals.</li> <li style="font-weight: 400;" aria-level="2">Grid following tightly controls active and reactive currents by synchronizing with the external grid.</li> <li style="font-weight: 400;" aria-level="2">Comparison of responses in island and grid-connected systems.</li> </ul> <li style="font-weight: 400;" aria-level="1">Benefits of Grid Forming Technology</li> <ul> <li style="font-weight: 400;" aria-level="2">Better performance in weak systems.</li> <li style="font-weight: 400;" aria-level="2">Damping of subsynchronous frequencies.</li> <li style="font-weight: 400;" aria-level="2">Enhanced voltage and frequency support.</li> </ul> <li style="font-weight: 400;" aria-level="1">Testing Framework</li> <ul> <li style="font-weight: 400;" aria-level="2">Four main test benches: Variable Impedance System (Single Machine Infinite Bus) , Double Battery, Variable Impedance System + series capacitor , and Perturbed Voltage Source.</li> <li style="font-weight: 400;" aria-level="2">Tests evaluate grid forming characteristics, stability, energy response, and damping.</li> <li style="font-weight: 400;" aria-level="2">IEEE 2800 compliance considerations.</li> </ul> <li style="font-weight: 400;" aria-level="1">Specific Tests and Objectives</li> <ul> <li style="font-weight: 400;" aria-level="2">Examples of tests: Loss of last synchronous machine, RoCoF tests, SCR step down with fault, angle step change, series compensation step test, energy response test, and frequency scan tests.</li> <li style="font-weight: 400;" aria-level="2">Some tests designated as pass/fail, others informational.</li> <li style="font-weight: 400;" aria-level="2">Tests designed to push inverters to their operational limits.</li> </ul> <li style="font-weight: 400;" aria-level="1">Challenges and Observations</li> <ul> <li style="font-weight: 400;" aria-level="2">Discussion on potential model improvements for grid following devices.</li> <li style="font-weight: 400;" aria-level="2">Interactions between grid forming and grid following devices not included in mandatory tests.</li> <li style="font-weight: 400;" aria-level="2">Importance of headroom and practical considerations for energy response.</li> </ul> <li style="font-weight: 400;" aria-level="1">Conclusion and Follow-up</li> <ul> <li style="font-weight: 400;" aria-level="2">Grid forming batteries show promising stabilization benefits.</li> <li style="font-weight: 400;" aria-level="2">Ongoing collaboration and future work anticipated.</li> <li style="font-weight: 400;" aria-level="2">Summary of OEMs’ performance and validation through tests.</li> </ul> </ul> <a href="https://dash3.gridmonitor.com/sharing/?token=eaa0362e-bdf5-410e-b08a-f9f835487e66" target="_blank" rel="noopener">3</a> - ERCOT Advanced Grid Support Inverter-Based ESR Assessment and Adoption Discussion - ERCOT, All - Fred Huang <ul> <li style="font-weight: 400;" aria-level="1"><a href="https://ercot-control-docs.s3.us-west-2.amazonaws.com/09/2024_07_ERCOT_IBRWG_ERCOT%2520Advanced%2520Grid%2520Support%2520Inverter-based%2520ESRs%2520Assessment%2520and%2520Adoption%2520Discussion_v1_.pdf" target="_blank" rel="noopener">Presentation</a> from Fred Haung</li> <li style="font-weight: 400;" aria-level="1">ERCOT is in the early stages of assessing new inverter-based energy storage resources (ESRs) with advanced grid support capabilities.</li> <li style="font-weight: 400;" aria-level="1">Feedback and industry collaboration are highly encouraged to improve the process.</li> <li style="font-weight: 400;" aria-level="1">Upcoming proposals aim to set standards for advanced grid support inverter-based ESRs, focusing on functionality and performance.</li> <li style="font-weight: 400;" aria-level="1">Initial focus is on voluntary adoption of new standards, with mandatory adoption considered for the near future.</li> <li style="font-weight: 400;" aria-level="1">ERCOT has been in dialogue with various industry original equipment manufacturers (OEMs), including those from the wind and solar sectors, to gain insights and support.</li> <li style="font-weight: 400;" aria-level="1">Preliminary results indicate that inverter-based ESRs can enhance grid stability with minimal hardware impact.</li> <li style="font-weight: 400;" aria-level="1">Studies show positive impact on system stability, potentially increasing limits for existing Grid Transmission Constraints (GTCs).</li> <li style="font-weight: 400;" aria-level="1">Considering global trends and activities, ERCOT aims to adopt advanced grid support inverter-based ESRs starting with energy storage and expanding to wind and solar.</li> <li style="font-weight: 400;" aria-level="1">Tools and models will need to be accurately coordinated and monitored for optimal grid support.</li> <li style="font-weight: 400;" aria-level="1">Future steps include submitting a revision request for adoption and potentially creating a new ESR support framework.</li> <li style="font-weight: 400;" aria-level="1">Acknowledgement of collaborative efforts with academia and internal ERCOT teams in progressing this initiative.</li> </ul> <h6>Questions</h6> Ryan Wu: Are there any considerations about the increased risk of islanding with grid forming adoption? Answer: Currently under internal discussion with an emphasis on operating ERCOT as a single grid. General Question: What's the timeline for protocol language adoption? Answer: Plan to have protocol language by end of 2024, with potential for further group discussions before formal submission. General Question: Is the work on specifications and testing finalized? Answer: Electronics recommendation used as primary reference; internal reviews and potential adjustments based on feedback are ongoing. <a href="https://dash3.gridmonitor.com/sharing/?token=9486e117-cc31-4701-b7e2-f79743ff4b9a" target="_blank" rel="noopener">5</a> - Draft DWG Procedure Manual Edits - John Schmall, Jonathan Rose - ERCOT, All <ul> <li style="font-weight: 400;" aria-level="1">Follow-up <a href="https://ercot-control-docs.s3.us-west-2.amazonaws.com/11/IBRWG-DWG-edits-NOGRR245_r3.pdf" target="_blank" rel="noopener">presentation</a> regarding NOGRR245 and IEEE 2800 changes.</li> <li style="font-weight: 400;" aria-level="1">Changes impact the DWG procedure manual, specifically voltage ride-through requirements.</li> <li style="font-weight: 400;" aria-level="1">DWG procedure manual is a key document for model quality testing (MQT).</li> <li style="font-weight: 400;" aria-level="1">Edits to the procedure manual incorporate new voltage ride-through curves from NOGRR245.</li> <li style="font-weight: 400;" aria-level="1">Updated manual is available on the ERCOT Dynamics Working Group webpage.</li> <li style="font-weight: 400;" aria-level="1">Presenting and seeking approval for language updates at the August ROS meeting.</li> <li style="font-weight: 400;" aria-level="1">Reconciling old legacy curves with new preferred curves in the updated manual.</li> <li style="font-weight: 400;" aria-level="1">Addressing modeling of switch shunts, transformer tap controllers, and testing for low/high voltage ride-through (LVRT/HVRT).</li> <li style="font-weight: 400;" aria-level="1">Requesting additional details in the table format to document equipment capabilities.</li> <li style="font-weight: 400;" aria-level="1">Ensuring alignment of provided models with actual operational practices and capabilities.</li> <li style="font-weight: 400;" aria-level="1">Next steps: ERCOT intends to review comments from stakeholders before moving forward.</li> </ul> <h6>Key Comments:</h6> <ul> <li style="font-weight: 400;" aria-level="1">Request for stakeholders to provide comments within a week, potentially extending the deadline to allow more time for review.</li> <li style="font-weight: 400;" aria-level="1">Stakeholders expressed concerns over time for reviewing complex changes.</li> <li style="font-weight: 400;" aria-level="1">ERCOT agreed on extending the comment deadline to around July 24, with a target post date by July 26.</li> <li style="font-weight: 400;" aria-level="1">Discussion on when new ride-through profiles from NOGRR245 would be effective.</li> </ul> <h6>Questions Addressed:</h6> <ul> <li style="font-weight: 400;" aria-level="1">Clarification on minor voltage changes and active power injection requirements.</li> <li style="font-weight: 400;" aria-level="1">Details about the speed and control of transformer tap settings and initialization scripts.</li> <li style="font-weight: 400;" aria-level="1">Requirement to model transformer tap controllers despite their time delay.</li> <li style="font-weight: 400;" aria-level="1">Acknowledgement of the implementation date and procedural nuances for NOGRR245.</li> </ul> <a href="https://dash3.gridmonitor.com/sharing/?token=a8d28752-aa90-4662-b6df-a8159655abad" target="_blank" rel="noopener">6</a> - Other Business - All <ul> <li style="font-weight: 400;" aria-level="1">Steven Solis deferred his item to the next meeting.</li> <li style="font-weight: 400;" aria-level="1">There was a discussion item from March ROS related to reclosing close to IBRs. This will be discussed in the SPWG meeting on the 17th and will be brought to the August agenda.</li> <li style="font-weight: 400;" aria-level="1">A market notice has been issued about switching to a single resource battery model starting from August 6, which will also be discussed in the next IBRWG meeting.</li> <li style="font-weight: 400;" aria-level="1">No other business items were brought up.</li> </ul> 7 - Adjourn