Project 2020-02 Modifications to PRC-024 (Generator Ride-through)

​​​​​​​Related Files

Status
The drafting team is developing the initial draft for setting performance ride-through criteria for inverter-based resources (IBR) during grid disturbances in a new standard (PRC-029), and is modifying PRC-024-3 for synchronous machines.

The Standards Committee approved waivers​ to the Standards Process Manual at their December 2023 meeting. These waivers were sought by NERC Standards for reduced formal comment and ballot periods to 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.


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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Draft

Actions

Dates

Results
Consideration of Comments

​​Waiver
​The Standards Committee approved the waiver on December 13, 2023

PRC-024 Standard Authorization Request
Clean | Redline​


The Standards Committee accepted the SAR on ​April 19, 2023

PRC-024 ​Standard Authorization Request

Supporting Materials

Unofficial Comment Form (Word)

​Comment Period

Info

Submit Comments


05/31/22 - 07/14/22
​​​

Comment​s Received​




Drafting Team Nominations

Unofficial Nomination Form (Word)​
Nomination Period

Info

Submit Nominations​


05/31/22 - 07/14/22

​​​​Standard Authorization Request
Clean | Redline

The Standards Committee accepted the SAR on ​April 20, 2022

Supplemental Drafting Team Nominations

Supporting Materials

Unofficial Nomination Form (Word)​


Nomination Period

Info

Submit Nominations



11/19/21 - 12/20/21​

Supplemental Drafting Team Nominations

Supporting Materials

Unofficial Nomination Form (Word)​


Nomination Period

Info​

Submit Nominations



​04/28/21 - 05/17/21


Standard Authorization Request

Supporting Materials

Unofficial Comment Form (Word) 

Transmission-connected Dynamic Reactive Resources White Paper



Comment Period

Info
(Updated)

Submit Comments




03/30/20 -
05/13/20(Extended)

 

 

Comments Received



​Consideration of Comments​




Drafting Team Nominations

Supporting Materials

Unofficial Nomination Form (Word)


Nomination Period

Info
(Updated)

Submit Nominations



03/30/20 - 05/13/20(Extended)