NOTICE DATE: May 29, 2020
NOTICE TYPE: M-D052920-01 Operations
SHORT DESCRIPTION: 2020 Summer and Fall Seasonal Voltage Profiles
INTENDED AUDIENCE:Resource Entities, Qualified Scheduling Entities (QSEs), Transmission Operators (TOs), Transmission Service Providers (TSPs), and NERC-registered Generator Operators (GOPs) and Transmission Operators (TOPs)
DAY AFFECTED: June 1, 2020
LONG DESCRIPTION: ERCOT has posted the 2020 Summer (June 1, 2020 – August 31, 2020) and 2020 Fall (September 1, 2020 – November 30, 2020) Voltage Profiles, which include Voltage Set Points for each Generation Resource’s Point of Interconnection (POI). ERCOT and the TSPs derived these Voltage Profiles after a series of joint studies and several meetings. In accordance with NERC Reliability Standard VAR-001-5, Requirement R5, the posted spreadsheet lists the seasonal Voltage Set Points for every Generation Resource at its POI in columns M and AD. Voltage Set Points at the high side of the step-up transformer are listed in columns P and AG.
As required by ERCOT Nodal Protocols Section 184.108.40.206(5), Generation Resources shall follow the Real-Time Voltage Set Point instruction given by ERCOT or the TSP. Any operator of one or more Generation Resources, including any NERC-registered GOP, whose Voltage Set Point in the posted Voltage Profile for each upcoming season differs from its Real-Time Voltage Set Point should coordinate with its TSP to determine if changes to the Real-Time Voltage Set Point are needed.
In accordance with ERCOT Nodal Operating Guide Section 220.127.116.11(4), Resource Entities required to provide Voltage Support Service (VSS), including any NERC-registered GOP, must maintain the generator voltage or Reactive Power schedule within 2% of the Voltage Set Point when operating at less than the maximum reactive capability of the Generation Resource, except under Force Majeure Events or unless explicitly authorized by or requested by ERCOT or the interconnecting TO. When a Resource Entity is instructed to follow a new Voltage Set Point, ERCOT expects the Generation Resource to reposition its AVR to best follow the new Voltage Set Point even if the new Voltage Set Point is within 2% of the previous Voltage Set Point.
ERCOT reminds all Generation Resource operators that the response to a TO Voltage Set Point instruction must be completed in no more than five minutes from receipt of the instruction under ERCOT Nodal Operating Guide Section 2.2.10(3)(b). Also, in accordance with ERCOT Nodal Protocols Section 3.15.3, each Generation Resource AVR must be operated in automatic voltage control mode and set to control the POI voltage to the Voltage Set Point. In accordance with ERCOT Nodal Operating Guide Section 18.104.22.168(3), a Resource Entity shall notify its QSE as soon as practicable if its Generation Resource cannot operate within 2% of the Voltage Set Point. In accordance with ERCOT Nodal Operating Guide Section 22.214.171.124, the QSE shall notify ERCOT as soon as practicable if its Generation Resource is unable to operate within 2% of the Voltage Set Point.
ADDITIONAL INFORMATION: The 2020 Summer and Fall Seasonal Voltage Profiles (EMIL ID ZP6-303-M, Report ID 11452) can be found on the ERCOT Market Information System (MIS) under Voltage Profiles on the Grid/Transmission page under Voltage and Dynamic Ratings secure area. The Seasonal Voltage Profile Studies for Summer and Fall 2020 may be accessed on the Groups and Rules/Transmission Service Provider Information secure page on the MIS. A Digital Certificate is required to access the MIS.
CONTACT: If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at ClientServices@ercot.com.
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