Related Files
Status
A formal comment period for PRC-029-1 - Frequency and Voltage Ride-through Requirements for Inverter-based Resources, is open through 8 p.m. Eastern, Monday, August 12, 2024.
This will be the last opportunity for NERC to ballot these projects through traditional mechanisms. The Board may take requisite action during the August 2024 Board of Trustees meeting to ensure directives are met.
The Standards Committee approved waivers to the Standard Processes Manual at their December 2023 meeting. These waivers were sought by NERC Standards staff for reduced formal comment and ballot periods. This will assist the drafting teams in expediting the standards development process due to firm timeline expectations set by FERC Order 901. FERC Order 901 was issued under Docket No. RM22-12-000 on October 19, 2023.
To assist industry in this upcoming comment and ballot period, NERC has released a Milestone 2 Summary that provides high-level overview of the current state of the associated projects and their interrelationships. The standard drafting team's considerations of the responses received from the previous comment period are reflected in this draft of the standard.
Note: PRC-024-4 passed the recent additional ballot (conducted June 28 – July 8, 2024). The drafting team will be moving this standard to a final ballot when the PRC-029-1 ballots open (August 2-12, 2024) as only non-substantive revision(s) were made.
Background
The Standards Committee accepted the revised SAR and authorized drafting revisions to the Reliability Standards identified in the SAR on April 19, 2023. The objective of the SAR is to modify PRC-024-3 or replace the standard with a performance-based ride-through standard that ensures generators remain connected to the BPS during system disturbances. Specifically, the SAR focuses on using disturbance monitoring data to substantiate IBR ride-through performance during grid disturbances. The SAR also ensures associated generators that fail to ride-through system events are addressed with a corrective action plan (if possible).
FERC Order 901 requires that IBR-related performance requirements for ride-through are completed and filed with FERC by November 4, 2024. This drafting team will address the IBR-related PRC-029 first and modify PRC-024 to only apply towards synchronous machines. Following the approval of PRC-029, the drafting team will consider additional modifications to PRC-024 to assure performance-based requirements for synchronous machines are adequately addressed per the SAR.
Standard(s) Affected – PRC-024
Purpose/Industry Need
From a risk-based
perspective, the goal of the standard is to mitigate the ongoing and systemic
performance issues identified across multiple Interconnections and across many
disturbances analyzed by NERC and the Regions. Ongoing NERC reports and
findings from NERC alerts have continued to substantiate that IBR are failing
to ride-through in accordance with expectations and multiple NERC guidelines.
These issues have been identified in IBRs as well as
synchronous generators, with many causes of tripping entirely unrelated to
voltage and frequency protection settings as dictated by the currently
effective version of PRC-024.
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