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PGRR027

Summary

Title Analysis of Subsynchronous Resonance Studies in Transmission Studies
Next Group
Next Step
Status Approved on 07/16/2013
Effective Dates
08/01/2013

Action

Date Gov Body Action Taken Next Steps
07/16/2013 BOARD Approved
05/02/2013 TAC Recommended for Approval ERCOT Board Consideration
04/11/2013 ROS Recommended for Approval TAC Consideration
03/27/2013 PLWG Recommended for Approval ROS Consideration
02/27/2013 PLWG Recommended for Approval PLWG IA Review

Voting Record

Date Gov Body Motion Result
07/16/2013 BOARD To approve PGRR027 as amended by the 7/2/13 TAC comments Passed
05/02/2013 TAC To recommend approval of PGRR027 as recommended by ROS in the 4/11/13 ROS Report Passed
04/11/2013 ROS To recommend approval of PGRR027 as recommended by PLWG in the 3/27/13 PLWG Report and as revised by ROS Passed
03/27/2013 PLWG 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
02/27/2013 PLWG To recommend approval of PGRR027 as amended by the 2/22/13 CenterPoint Energy comments and as revised by PLWG

Background

Status: Approved
Date Posted: Jan 15, 2013
Sponsor: ERCOT
Urgent: No
Sections: 2.2, 5.1.2, 5.4.1, 5.4.2, 5.4.2.1, 5.4.5.1, 5.7.5
Description: 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.
Reason: With 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.

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