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Improved Dynamic Models for IBRs and DHS Electromagnetic Pulse (EMP) Program Status Report

· Improved Dynamic Models for IBRs

The dynamic response of Inverter Based Resources (IBRs) is important as these resources become an increasingly large part of our power system, and there have been system events where actual response did not match expected or modeled expectations.

NERC responded to earlier events with NERC Alerts seeking information and requesting changes to control parameters for equipment that supports such changes, with the general goal of ensuring that that IBR performance appropriately meets the voltage and frequency no-trip requirements of PRC-024. There have also been requests for updated and improved models for IBRs so that the system can be modeled with higher fidelity.

On July 7th, a system event occurred in California and again a few IBR sites did not respond as predicted based on their submitted models. NERC issued RFIs to affected sites for the Event Analysis of the event. This again brings up questions of whether the IBR models are accurate and if control changes were implemented. In late August, NERC and WECC published a joint report, WECC Base Case Review: Inverter-Based Resources. The report notes:

- Generator Owners should ensure that the dynamic models for their respective facilities are parameterized to reflect the actual installed equipment at each specific site and should not include generic parameter values.

- Transmission Planners and Planning Coordinators should verify the dynamic model parameters provided by Generator Owners to ensure that they match the as-built controls, settings, and configuration of the equipment installed in the field.

The NAGF recommends that its members and others in the industry read the NERC WECC Modeling Report (link below). The NAGF also requests that Generator Owners work with their respective Transmission Planners and Planning Coordinators if they have any questions related to confirming the models are correct. It is through this collaboration the industry can successfully ensure that system studies can correctly and accurately analyze the stability and reliability of the system.

· DHS Electromagnetic Pulse (EMP) Program Status Report

The U.S. Department of Homeland Security (DHS) has worked to reduce risk from an EMP attack by seeking to develop a greater understanding of EMP effects on critical infrastructure, national critical functions, and national essential functions, and by taking key actions to address known EMP-related vulnerabilities to critical infrastructure. The program status report is available per the following link:



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