Proposal to Remove from Service the PV-COI RAS

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Presentation transcript:

Proposal to Remove from Service the PV-COI RAS Justin Lee August 2, 2017

Agenda Purpose Historical Background Summary of Study Results Recommendation 08/02/2017

Purpose Obtain RASRS approval to remove from service the PV-COI RAS 08/02/2017

Historical Background Planned upgrades of the three Palo Verde (PV) Units Winter / Summer PV Unit #2 – November 2003 (121MW / 92MW) PV Unit #1 – November 2005 (121MW / 92MW) PV Unit #3 – November 2007 (121MW / 92MW) 08/02/2017

Historical Background Technical Studies showed impact on California Oregon Inter-Tie (COI) Pre PV unit upgrades showed minimum of 134MVAR margin on COI system busses Post PV unit upgrades study case diverged, indicated zero MVAR margin on COI system busses Direct Load Tripping of 150MW in Phoenix Area restored MVAR margin to 139MVAR 08/02/2017

08/02/2017

0MW 200MVAR 400MW 0MVAR 1000MW 200MVAR 08/02/2017

08/02/2017

Historical Background A Direct Load Trip (DLT) scheme was designed and implemented Scheme arms when output of any two units at Palo Verde exceeds 2550MW Scheme operates if two Palo Verde units trip within five minutes 150MW of load armed, 120MW to trip DLT scheme placed in service in 2004 08/02/2017

Historical Background The Transmission System has Changed Since the PV-COI RAS was Installed Series capacitors installed on John Day – Grizzly #1 and #2 500kV lines 308MVAR Shunt capacitor installed at the Slatt 500KV bus 08/02/2017

Historical Background To be compliant with PRC-012 through 014- WECC-CRT-2 WR10, SRP began a project to assess the operation, coordination, and effectiveness of the PV-COI RAS A third party consultant was hired to perform the technical analysis 08/02/2017

Summary of Study Results The study results show that with the COI stressed to it limit and without the PV-COI RAS in service The system continues to meet all power flow, voltage, stability, and transient stability criteria There is a minimum of 472MVAR of Margin on the COI system busses, well above the 134MVAR of margin that the RAS was designed to maintain 08/02/2017

Recommendation Based on the study results, SRP recommends that the PV-COI RAS be removed from service by December 31, 2017 and decommissioned at a later date. 08/02/2017

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