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Planning Geomagnetic Disturbance Task Force (PGDTF) Update to the ROS

This update provides information on the recent activities and discussions of the Geomagnetic Disturbance Task Force in their meeting with the ROS on May 3, 2018. Topics discussed include GIC System Model working session, RARF submission update, NERC TPL-007-1 R2 requirements, and upcoming PGDTF activities.

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Planning Geomagnetic Disturbance Task Force (PGDTF) Update to the ROS

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  1. Planning Geomagnetic Disturbance Task Force (PGDTF) Update to the ROS May 3, 2018 Dylan Preas PGDTF Chair 5/3/2018 ROS Meeting

  2. GIC System Model Working Session(Geo-magnetically Induced Currents) • TSP-only working session on April 12th (afternoon) and April 13th • Reviewed GIC flow results for TSPs/REs submitted data • Made corrections/updates to the GIC System Model • Ended with a “combined master GIC System Model” • TSP submitted final pass model updated on April 20th 5/3/2018 ROS Meeting

  3. RARF Submission Update • RE’s submit GIC System Model data via the RARF • Transformer data provided via the RARF is 96.7% • ERCOT has added GIC data from “pending RARFs” • Vector group identifiers continue to be a problem 5/3/2018 ROS Meeting

  4. NERC TPL-007-1 R2 • Each responsible entity, as determined in Requirement R1, shall maintain System models and GIC System models of the responsible entity’s planning area for performing the study or studies needed to complete GMD Vulnerability Assessment(s). • NERC enforceable on July 1, 2018 • ERCOT is developing an internal process for maintenance of the GIC System Models for the ERCOT region • TSPs will submit GIC System Model data via data requests 5/3/2018 ROS Meeting

  5. Planning Guide Section 6: Data/Modeling(included as part of R2 discussion – if needed) 6.11 Process for Developing Geomagnetically-Induced Current (GIC) System Models (1) To adequately simulate Geomagnetic Disturbance (GMD) events, it is necessary to establish and maintain GIC system models and conduct geomagnetic disturbance vulnerability assessments to determine whether the ERCOT System can withstand performance requirements of the benchmark geomagnetic disturbance event described in North American Electric Reliability Corporation (NERC) Reliability Standards. These models, known as GIC base cases, shall contain appropriate system data, and shall represent projected system conditions that provide a starting point for the required year(s). (a) Transmission Service Providers (TSPs) and ERCOT shall develop the GIC base cases. These base cases are derived from the steady-state base cases developed by Steady-State Working Group (SSWG) for the near-term transmission planning horizon to ensure consistency between the system topology in the SSWG base cases and GIC system models. (b) Each TSP, or its Designated Agent, shall provide its respective transmission network GIC model data in accordance with the GIC System Model Procedure Manual. (c) Each Resource Entity, or its Designated Agent, shall provide its respective Resource Entity-owned generating units, plants, transmission lines, shunt devices and Generation Step Ups (GSUs) connected to the ERCOT System in accordance with the GIC System Model Procedure Manual and the Resource Registration Glossary. (d) ERCOT shall aggregate the GIC system model data supplied by each TSP and Resource Entity and shall compile and maintain the GIC system models. Upon completion of compiling the data for the GIC base cases, ERCOT shall post these cases on the ERCOT Market Information System (MIS) Certified TransmissionServiceProviderInformationpagefor review and comments as described in the GIC System Model Procedure Manual. (e) Guidelines and formats for the GIC system model data and model maintenance can be found in the GIC System Model Procedure Manual. (f) GIC data is considered Protected Information pursuant to Protocol Section 1.3, Confidentiality. 5/3/2018 ROS Meeting

  6. NERC TPL-007-1 R3 • “…criteria for acceptable System steady state voltage performance for its System during the benchmark GMD event” • ROS comments included: (b) The ERCOT System shall remain stable with no cascading as defined by: (i) total load loss greater than 6% of the total initial system load. and identifying facilities with a “more restrictive range” (i.e. nuclear plants) – TSP to provide this data to ERCOT via a data request 5/3/2018 ROS Meeting

  7. Upcoming PGDTF Activities • PGDTF Business Meetings on May 10th • Open meeting • Update to the ERCOT process for maintaining the GIC System Model (R2) • Review GMD Vulnerability Assessment Scope • TSP comments due on April 20th • TAMU GIC Monitoring Presentation • Power grid research to deploy real-time a real-time magnetometer and GIC monitor network in Texas 5/3/2018 ROS Meeting

  8. Questions 5/3/2018 ROS Meeting

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