search
  |    Account Log-In/Register    |    Contact Us
Project 2008-02 Undervoltage Load Shedding (UVLS) & Underfrequency Load Shedding (UFLS)
Related Files | 2008-02.2 Phase 2 of Undervoltage Load Shedding (UVLS): Misoperations

 

UVLS Status - PRC-010-1
Board Adopted: November 13, 2014  
Filed with FERC: February 6, 2015
 
Order Effective:
 
Enforcement Date:
 
 
UFLS Status - PRC-006-2
Board Adopted: November 13, 2014 
 
Filed with FERC: December 15, 2014
 
Order Effective: March 4, 2015
 
Enforcement Date: October 1, 2015

 
UVLS information

Purpose/Industry Need:
To establish an integrated and coordinated approach to the design, evaluation, and reliable operation of undervoltage load shedding programs used to mitigate undervoltage conditions leading to voltage instability, voltage collapse, or Cascading impacting the Bulk Electric System (BES)

 
Background:
In January 2010, NERC posted the Project 2008-02 Undervoltage Load Shedding (UVLS) SAR for public comment. The SAR cited NERC technical reports and assessments of UVLS programs and standards, along with the FERC Order No. 693 directive that approved PRC-010-0 but requested that it be modified to require that an integrated and coordinated approach be included in all protection systems on the Bulk Power System, including generators and transmission lines, generators’ low voltage ride-through capabilities, and underfrequency load shedding (UFLS) and UVLS programs
.
 
Concurrently with the SAR posting, nominations were accepted for a drafting team. Work was deferred due to prioritization for the
2011–2013 Reliability Standards Development Plan (RSDP) and the effort was restarted as part of the 2013–2015 RSDP. A formal drafting team was appointed on May 21, 2013. Its members are tasked with reevaluating and revising the SAR and subsequently proceeding with standard development. The team’s objective is to ensure that Project 2008-02 addresses NERC’s existing UVLS standards such that they are results-based, address the appropriate regulatory directives, coordinate with present reliability standard efforts (e.g., Paragraph 81, the Independent Expert Review Panel, and Five-Year Reviews), and consider current reliability issues associated with UVLS.
UFLS information

Purpose: 
The purpose of the UFLS project is to address an outstanding FERC directive and review PRC-006-1 to determine if any steady state modifications are appropriate (i.e., Paragraph 81 criteria and recommendations of the Independent Expert Review Panel).  Specifically, the standard drafting team will revise PRC-006-1 to address the directive included in FERC Order No. 763 and to provide for clear, unambiguous design and documentation requirements for automatic UFLS programs.
  
Background: 
The UFLS work will be done in concert with the current efforts underway by the UVLS standard drafting team in order to ensure overall consistency and alignment for these protection systems programs. The revised SAR was posted on May 23, 2014 for a 30-day informal comment period, which concluded on June 23, 2014.    

 

 Draft Action Dates Results Consideration of Comments

UFLS

PRC-006-2
Clean | Redline to Last Posting
Redline to PRC-006-1

Implementation Plan

Final Ballot​

Info>>

Vote>>​

​10/22/14 - 10/31/14(closed) Summary>>

Ballot Results>>
UVLS
 
PRC-010-1
Clean | Redline
 
Implementation Plan
Clean | Redline
 
Supporting Materials:
 
 
 
 
PRC-010-1 FAQ
Clean | Redline
 
 
 
 

Final Ballot​

Info>>

 Vote>>​

 

​09/08/14 - 09/18/14
(closed)

​Summary>>

 

Ballot Results>>

UFLS

​PRC-006-2
Clean | Redline

Implementation Plan

Supporting Materials:

Unofficial Comment Form (Word)

Response to Paragraph 81/Independent Expert Review Project Recommendations for PRC-006-1

VRF and VSL Justification

Consideration of FERC Directive

Draft RSAW

Initial Ballot and Non-Binding Poll

Updated Info>>

Info>>

Vote>>​

09/29/14 - 10/08/14
(closed)​


Summary>>

 

Ballot Results>>

 

Non-Binding Poll Results>>​

​Consideration of Comments>>

Comment Period

Info>>

Submit Comments>>​

​08/21/14 - 10/08/14
(closed)
Comments Received>>
Join Ballot Pools>> 08/21/14 - ​09/19/14
(closed)


Please send RSAW feedback to:

RSAWfeedback@nerc.net

09/10/14 - 10/08/14​
UVLS
 
​PRC-010-1
Clean | Redline
 
 
Supporting Materials:
 
Standard Authorization Request
 
 
 
 

PRC-010-1 FAQ

Draft RSAW

Ballot and Non-Binding Poll
 
Vote>>
07/29/14 – 08/08/14
(closed)

Summary>>

 

Ballot Results>>

 

Non-Binding Poll Results>>​

Consideration of Comments>>
Comment Period
 
Submit Comments>>
06/24/14 – 08/08/14
(closed)
Comments Received>>​
Join Ballot Pools>> 06/24/14 – 07/23/14
(closed)

Please Send RSAW Feedback to:

RSAWfeedback@nerc.net
07/10/14 - 08/07/14​
UFLS
 
 
 

 

Comment Period
 
 
Submit Comments >>
​05/23/14 - 06/23/14
(closed)
Comments Received>>


UVLS

​PRC-010-1

Implementation Plan

Supporting Materials:
Unofficial Comment Form (Word)

Standard Authorization Request

Mapping Document

VRF/VSL Justification

UVLS Project Coordination Plan

PRC-010-1 FAQ 

​Comment Period

Info>>

Submit Comments>>

03/17/14 - 04/16/14
(closed)
Comments Received>>​ ​Consideration of Comments>>


 UVLS

Revised SAR

Supporting Materials:

Draft Standard

Unofficial Comm​ent Form (Word)

Comment Period

Info>>

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Submit Comments>>

​09/10/13 - 10/09/13
(closed)
Comments Received>>​ ​PRC-010-1 FAQ/Consideration of Comments

UVLS

Supporting Materials:
Nomination Form (Word)


Nomination Period

Info>> 

Submit Nomination>>

03/21/13 - 04/19/13
(closed)​

UVLS

Draft SAR Version 1

Supporting Materials:
Comment Form (Word)
Nomination Form (Word)


Comment Period

Submit Comments>>

Info>>
01/20/10 - 02/19/10
(closed)
Comments Received>>  

Nomination Period

Submit Nomination>>

Info>>
01/20/10 - 02/03/10
(closed)
   
To download a file click on the file using your right mouse button, then save it to your computer in a directory of your choice.
 
All comments should be forwarded to sarcomm@nerc.net.  
 
 

home | account log-in/register | legal and privacy/trademark policy | site map | careers | contact us

Atlanta Office | 3353 Peachtree Road, NE Suite 600 North Tower, Atlanta, GA 30326 | 404-446-2560
Washington Office | 1325 G Street, NW Suite 600, Washington, DC 20005| 202-400-3000

Copyright 2016 North American Electric Reliability Corporation. All rights reserved.