PGRR #27 · Revision Request

PGRR027 Analysis of Subsynchronous Resonance Studies in Transmission Studies

Approved sponsor ERCOT posted 2013-01-15 ercot.com

ReasonWith the addition of multiple series compensated transmission lines to the ERCOT Transmission Grid, the ERCOT System has become vulnerable to much higher risk of SSR between series compensated lines and other Transmission Elements. Type 3 wind turbines (duel feed induction generators) are more vulnerable than most other Transmission Elements to this condition. The combination of series compensated lines and Type 3 wind turbines in the Competitive Renewable Energy Zone (CREZ) transmission zones makes procedures to protect against this reliability problem critical. This PGRR will provide for these procedures.

Created2013-02-27

Approved2013-07-16

Sections Affected

2.25.1.25.4.15.4.25.4.2.15.4.5.15.7.5

Summary

This Planning Guide Revision Request (PGRR) describes how ERCOT will act to protect the ERCOT Transmission Grid from Subsynchronous Resonance (SSR) oscillations since installation of multiple series compensated transmission lines has increased ERCOT’s vulnerability to such oscillations.

Timeline

Jan 15 '13
ROSFiled by ERCOT
- 027PGRR-01 Analysis of Subsynchronous Resonance Studies in Trans Jan 15 '13 · Revision Request
- 027PGRR-02 Impact Analysis 011513 Jan 15 '13 · Staff Report
Feb 27 '13
PLWG Planning Working Group (PLWG) Meeting
PLWGRecommended for Approval Recommended for approval Amended by the Feb 22 '13 CenterPoint Energy comments Amended by the PLWG comments
“To recommend approval of PGRR027 as amended by the 2/22/13 CenterPoint Energy comments and as revised by PLWG”

→ PLWG IA Review
- 027PGRR-03 LCRA TSC Comments 012413 Jan 24 '13 · Revision Request Comments
- 027PGRR-04 CenterPoint Energy Comments 022213 Feb 22 '13 · Revision Request Comments
Mar 27 '13
PLWGEmail Vote / Unlisted Meeting
PLWGRecommended for Approval Recommended for approval Forwarded → ROS Amended by the Mar 26 '13 Oncor comments
“Consensus to endorse and forward the 2/27/13 PLWG Report as amended by the 3/26/13 Oncor comments and as revised by PLWG and the Impact Analysis to ROS”

→ ROS Consideration
- 027PGRR-05 PLWG Report 022713 Mar 1 '13 · Committee Report
Apr 11 '13
ROS Reliability and Operations Subcommittee (ROS) Meeting
ROSRecommended for Approval Recommended for approval Amended by the Mar 27 '13 PLWG comments Amended by the ROS comments
“To recommend approval of PGRR027 as recommended by PLWG in the 3/27/13 PLWG Report and as revised by ROS” — Passed

→ TAC Consideration
- 027PGRR-06 Oncor Comments 032613 Mar 28 '13 · Revision Request Comments
- 027PGRR-07 PLWG Report 032713 Apr 1 '13 · Committee Report
May 2 '13
TAC Technical Advisory Committee (TAC) Meeting
TACRecommended for Approval Recommended for approval
“To recommend approval of PGRR027 as recommended by ROS in the 4/11/13 ROS Report” — Passed

→ ERCOT Board Consideration
- 027PGRR-08 ROS Report 041113 Apr 16 '13 · Committee Report
- 027PGRR-09 TAC Report 050213 May 2 '13 · Committee Report
Jun 26 '13
PLWG Planning Working Group (PLWG) Meeting
- 027PGRR-10 OWG Comments 062513 Jun 25 '13 · Revision Request Comments
Jul 2 '13
TAC Technical Advisory Comittee (TAC) Meeting
- 027PGRR-11 TAC Comments 070213 Jul 2 '13 · Revision Request Comments
Jul 16 '13
BOARD Board of Directors Meeting
BOARDApproved Recommended for approval Amended by the Jul 2 '13 TAC comments
“To approve PGRR027 as amended by the 7/2/13 TAC comments” — Passed
Aug 28 '13
PLWG Planning Working Group (PLWG) Meeting
- 027PGRR-12 Board Report 071613 Jul 17 '13 · Committee Report