NPRR #562 · Revision Request
NPRR562 Subsynchronous Resonance
ReasonSSR is a potentially harmful phenomenon involving coincident oscillation between two or more Transmission Elements or Generation Resources at frequencies lower than the normal operating frequency (60 Hz) of the ERCOT System. The ERCOT System has recently become more vulnerable to SSR because of the introduction of series capacitors for voltage support, although other Transmission Elements (including poorly tuned power electronic devices) and generator control systems can also create SSR. Without proper mitigation, SSR can quickly destroy resonating Transmission Elements and/or Generation Resources and lead to cascading Outages. It is therefore essential to carefully study and mitigate this risk. This NPRR is intended to create a process for investigating and addressing SSR risk and to clarify the responsibilities of the various Entities affected.
Created2013-09-19
Approved2017-06-13
Sections Affected
2.12.23.1.13.1.5.113.22 (new)3.22.1 (new)3.22.1.1 (new)3.22.1.2 (new)3.22.1.3 (new)3.22.1.4 (new)3.21.2 (new)and 3.22.3 (new)
Summary
This Nodal Protocol Revision Request (NPRR) creates new requirements for the identification, study, mitigation of, and protection against Subsynchronous Resonance (SSR).
Action Log 7 milestones
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Sep 19
PRSDeferred/Tabled→ PRS for consideration
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May 15
PRSDeferred/Tabled→ PRS for consideration
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Jun 11
PRSDeferred/Tabled→ PRS for consideration
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Mar 9
PRSRecommended for Approval→ PRS for Impact Analysis review
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Apr 13
PRSRecommended for Approval→ Revision Request Consideration
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May 25
TACRecommended for Approval→ Revision Request Consideration
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Jun 13
BOARDApproved
Amendments
| Date | Body | Motion | Result |
|---|---|---|---|
| Mar 9 '17 | PRS | To recommend approval of NPRR562 as amended by the 3/3/17 ERCOT comments | Passed |
| Apr 13 '17 | PRS | To endorse and forward to TAC the 3/9/17 PRS Report, as revised by PRS, and Revised Impact Analysis for NPRR562 with a recommended priority of 2017 and rank of 1990. | Passed |
Documents 51
| Name | Type | Posted | Classification |
|---|---|---|---|
| 562NPRR-01 Subsynchronous Resonance 081213 | doc | Aug 12 '13 | Revision Request |
| 562NPRR-02 Impact Analysis 081213 | doc | Aug 12 '13 | Staff Report |
| 562NPRR-03 Oncor Electric Delivery Comments 090513 | doc | Sep 3 '13 | Revision Request Comments |
| 562NPRR-05 Lone Star Transmission Comments 090613 | doc | Sep 6 '13 | Revision Request Comments |
| 562NPRR-06 Calpine Comments 091313 | doc | Sep 13 '13 | Revision Request Comments |
| 562NPRR-07 PRS Report 091913 | doc | Sep 24 '13 | Committee Report |
| 562NPRR-08 Wind Energy Transmission Texas Comments 092613 | doc | Sep 26 '13 | Revision Request Comments |
| 562NPRR-09 AEPSC Comments 100813 | doc | Oct 8 '13 | Revision Request Comments |
| 562NPRR-10 GDF SUEZ Comments 040314 | doc | Apr 3 '14 | Revision Request Comments |
| 562NPRR-11 ERCOT Comments 040914 | doc | Apr 10 '14 | Revision Request Comments |
| 562NPRR-12 Calpine Comments 041714 | doc | Apr 18 '14 | Revision Request Comments |
| 562NPRR-13 Calpine Comments 050614 | doc | May 6 '14 | Revision Request Comments |
| 562NPRR-14 Luminant Comments 050914 | doc | May 9 '14 | Revision Request Comments |
| 562NPRR-15 EDF RE Comments 051314 | doc | May 13 '14 | Revision Request Comments |
| 562NPRR-16 NRG Texas Power Comments 051314 | doc | May 13 '14 | Revision Request Comments |
| 562NPRR-17 ERCOT Comments 051414 | doc | May 14 '14 | Revision Request Comments |
| 562NPRR-18 PRS Report 051514 | doc | May 19 '14 | Committee Report |
| 562NPRR-19 Calpine Comments 052114 | doc | May 21 '14 | Revision Request Comments |
| 562NPRR-20 ERCOT Comments 060914 | doc | Jun 9 '14 | Revision Request Comments |
| 562NPRR-21 NRG Texas Power Comments 060914 | doc | Jun 9 '14 | Revision Request Comments |
| 562NPRR-22 PRS Report 061114 | doc | Jun 16 '14 | Committee Report |
| 562NPRR-23 ERCOT Comments 032015 | doc | Mar 20 '15 | Revision Request Comments |
| 562NPRR-23(b) WGR Frequency Dependent Impedance Table 032015 | xlsx | Mar 20 '15 | Forms and Templates |
| 562NPRR-24 LCRA TSC Comments 040315 | doc | Apr 3 '15 | Revision Request Comments |
| 562NPRR-25 TCPA Comments 040315 | doc | Apr 3 '15 | Revision Request Comments |
| 562NPRR-26 Luminant Comments 040315 | doc | Apr 3 '15 | Revision Request Comments |
| 562NPRR-27 Oncor Comments 040715 | doc | Apr 7 '15 | Revision Request Comments |
| 562NPRR-28 AEP Comments 040715 | doc | Apr 7 '15 | Revision Request Comments |
| 562NPRR-29 ERCOT Comments 060115 | doc | Jun 1 '15 | Revision Request Comments |
| 562NPRR-30 CenterPoint Energy Comments 061215 | doc | Jun 12 '15 | Revision Request Comments |
| 562NPRR-31 Oncor Comments 061215 | doc | Jun 12 '15 | Revision Request Comments |
| 562NPRR-32 LCRA Comments 061215 | doc | Jun 12 '15 | Revision Request Comments |
| 562NPRR-33 Recurrent Energy 061215 | doc | Jun 12 '15 | Revision Request Comments |
| 562NPRR-34 TCPA Comments 061515 | doc | Jun 15 '15 | Revision Request Comments |
| 562NPRR-35 APEX Comments 070915 | doc | Jul 9 '15 | Revision Request Comments |
| 562NPRR-36 ERCOT Comments 121015 | doc | Dec 10 '15 | Revision Request Comments |
| 562NPRR-37 Vestas Comments 122815 | doc | Dec 28 '15 | Revision Request Comments |
| 562NPRR-38 EDF Renewable Energy Comments 123015 | doc | Dec 30 '15 | Revision Request Comments |
| 562NPRR-39 TCPA Comments 123115 | doc | Dec 31 '15 | Revision Request Comments |
| 562NPRR-40 AEP Comments 123115 | doc | Dec 31 '15 | Revision Request Comments |
| 562NPRR-41 Oncor Comments 123115 | doc | Dec 31 '15 | Revision Request Comments |
| 562NPRR-42 PEG LP Comments 010416 | doc | Jan 4 '16 | Revision Request Comments |
| 562NPRR-43 ERCOT Comments 012717 | doc | Jan 27 '17 | Revision Request Comments |
| 562NPRR-44 TCPA Comments 021317 | doc | Feb 13 '17 | Revision Request Comments |
| 562NPRR-45 Oncor Comments 021317 | doc | Feb 13 '17 | Revision Request Comments |
| 562NPRR-46 ERCOT Comments 030317 | doc | Mar 3 '17 | Revision Request Comments |
| 562NPRR-47 PRS Report 030917 | doc | Mar 13 '17 | Committee Report |
| 562NPRR-48 Revised Impact Analysis 040617 | doc | Apr 6 '17 | Staff Report |
| 562NPRR-49 PRS Report 041317 | doc | Apr 19 '17 | Committee Report |
| 562NPRR-50 TAC Report 052517 | doc | May 26 '17 | Committee Report |
| 562NPRR-51 Board Report 061317 | doc | Jun 13 '17 | Committee Report |
Meetings That Took It Up 60
| Date | Meeting | Committee | Status |
|---|---|---|---|
| Jun 13 '17 | Board of Directors Meeting | BOARD | Concluded |
| May 25 '17 | TAC Meeting | TAC | Concluded |
| Apr 13 '17 | PRS Meeting | PRS | Concluded |
| Apr 6 '17 | ROS Meeting | ROS | Concluded |
| Mar 22 '17 | PLWG Meeting | PLWG | Concluded |
| Mar 9 '17 | PRS Meeting | PRS | Concluded |
| Feb 22 '17 | PLWG Meeting | PLWG | Concluded |
| Feb 9 '17 | PRS Meeting | PRS | Concluded |
| Jan 19 '17 | PRS Meeting | PRS | Concluded |
| Dec 1 '16 | PRS Meeting | PRS | Concluded |
| Nov 10 '16 | PRS Meeting | PRS | Concluded |
| Oct 13 '16 | PRS Meeting | PRS | Concluded |
| Sep 15 '16 | PRS Meeting | PRS | Concluded |
| Aug 11 '16 | PRS Meeting | PRS | Concluded |
| Jul 14 '16 | PRS Meeting | PRS | Concluded |
| Jun 16 '16 | PRS Meeting | PRS | Concluded |
| May 12 '16 | PRS Meeting | PRS | Concluded |
| Apr 14 '16 | PRS Meeting | PRS | Concluded |
| Mar 10 '16 | PRS Meeting | PRS | Concluded |
| Feb 11 '16 | PRS Meeting | PRS | Concluded |
| Jan 14 '16 | PRS Meeting | PRS | Concluded |
| Dec 10 '15 | PRS Meeting | PRS | Concluded |
| Nov 12 '15 | PRS Meeting | PRS | Concluded |
| Oct 15 '15 | PRS Meeting | PRS | Concluded |
| Sep 10 '15 | PRS Meeting | PRS | Concluded |
| Aug 13 '15 | PRS Meeting | PRS | Concluded |
| Jul 16 '15 | PRS Meeting | PRS | Concluded |
| Jun 11 '15 | PRS Meeting | PRS | Concluded |
| May 14 '15 | PRS Meeting | PRS | Concluded |
| Apr 16 '15 | PRS Meeting | PRS | Concluded |
| Mar 12 '15 | PRS Meeting | PRS | Concluded |
| Feb 12 '15 | PRS Meeting | PRS | Concluded |
| Jan 15 '15 | PRS Meeting | PRS | Concluded |
| Dec 11 '14 | PRS Meeting | PRS | Concluded |
| Nov 6 '14 | PRS Meeting | PRS | Concluded |
| Oct 9 '14 | PRS Meeting | PRS | Concluded |
| Sep 11 '14 | PRS Meeting | PRS | Concluded |
| Aug 14 '14 | PRS Meeting | PRS | Concluded |
| Jul 17 '14 | PRS Meeting | PRS | Concluded |
| Jun 11 '14 | PRS Meeting | PRS | Concluded |
| May 15 '14 | PRS Meeting | PRS | Concluded |
| Apr 10 '14 | PRS Meeting | PRS | Concluded |
| Apr 3 '14 | ROS Meeting | ROS | Concluded |
| Apr 3 '14 | Workshop re NPRR562, Subsynchronous Resonance | Concluded | |
| Mar 18 '14 | PRS Meeting | PRS | Concluded |
| Feb 13 '14 | PRS Meeting | PRS | Concluded |
| Jan 16 '14 | PRS Meeting | PRS | Concluded |
| Dec 19 '13 | Protocol Revision Subcommittee (PRS) Meeting | PRS | Concluded |
| Nov 21 '13 | Protocol Revision Subcommittee (PRS) Meeting | PRS | Concluded |
| Oct 23 '13 | Planning Working Group (PLWG) Meeting | PLWG | Concluded |
| Oct 17 '13 | Protocol Revision Subcommittee (PRS) Meeting | PRS | Concluded |
| Oct 14 '13 | SSR Workshop | Concluded | |
| Oct 10 '13 | Reliability and Operations Subcommittee (ROS) Meeting | ROS | Concluded |
| Oct 9 '13 | Wholesale Market Subcommittee (WMS) Meeting | WMS | Concluded |
| Sep 25 '13 | Planning Working Group (PLWG) Meeting | PLWG | Concluded |
| Sep 19 '13 | Protocol Revision Subcommittee (PRS) Meeting | PRS | Concluded |
| Sep 12 '13 | Reliability and Operations Subcommittee (ROS) Meeting | ROS | Concluded |
| Sep 11 '13 | Wholesale Market Subcommittee (WMS) Meeting | WMS | Concluded |
| Sep 9 '13 | Workshop on NPRR562, Subsynchronous Resonance | Concluded | |
| Aug 28 '13 | Planning Working Group (PLWG) Meeting | PLWG | Concluded |