Transmission Owners and Transmission Service Providers,
The ERCOT Board of Directors has approved PGRR046 (attached) which modifies the ERCOT Planning Guide to add the requirement for the ERCOT Staff, the Resource Entities and the TSPs to develop the Geomagnetically-Induced Current (GIC) System Models required to perform the Geomagnetic Disturbance (GMD) vulnerability assessment required by the NERC GMD Planning Standard. The Reliability and Operations Subcommittee (ROS) formed the Planning Geomagnetic Disturbance Task Force (PGDTF) to work with the ERCOT Staff to develop the GIC System Models and to perform the GMD vulnerability assessment. The ROS has approved the attached GIC System Model Procedure Manual which will be followed, along with the attached NERC GIC Application Guide, to create the GIC System Models. The models are a direct current model, not an alternating current model like the power flow model, because the GICs are quasi direct currents. Following is an excerpt from the Procedure Manual that provides a general description of the model. All TSPs are required to provide the data for its system to the ERCOT Staff, who, in conjunction with the PGDTF, will compile the transmission and generation data into the model for the ERCOT system. The data for the initial model is due to the ERCOT Staff in December 2016 to provide adequate time for the ERCOT Staff and the PGDTF to complete development of the model and testing of the GIC software. Additional information concerning the PGDTF and the GMD planning activity can be found on the PGDTF's web page at http://www.ercot.com/committee/pgdtf. If you are not a member of the PGDTF, you can join at http://lists.ercot.com/scripts/wa-ERCOT.exe?INDEX=&p=2.
1.1.1. GIC System Model - General
ERCOT shall provide a workbook to TSPs for the submission of data for the GIC System Model. TSPs shall provide the GIC System Model data to ERCOT using the provided workbook as shown in Appendix B by the schedule published by the PGDTF.
For the 200 kV system and above, actual data should be used for the GIC System Model. Typical data based upon actual data or data converted from SSWG base case data can be used if actual data is not available.
For the 69 kV and 138 kV systems, actual data may be used for the GIC System Model to the extent possible. Typical data based upon actual data can be used if actual data is not available. Default data as specified by this Procedure Manual or data converted from SSWG base case data can be used if actual or typical data is not reasonably available.
The PGDTF will select the latest update to the SSWG base cases, updated if required to reflect known and significant changes, to be used as the starting base cases for the GIC System Model as listed below.
* The System Peak case will be represented by the SSWG three year out Summer Peak case.
* The Off-peak case will be represented by the three year out SSWG MIN case.
The next meeting of the PGDTF is scheduled for Wednesday September 28, 2016 at the Met Center in Austin. WebEx will be available for the meeting if you cannot attend in person. We will continue the discussions on the data required for the GIC System Models and provide lessons learned so far in the development of the data.
Please contact me if you have any questions.
Thanks,
Michael Juricek, P.E.
Chairman Planning Geomagnetic Disturbance Task Force
Asset Planning Distribution and Transmission
Oncor Electric Delivery Co LLC
E-mail: [log in to unmask]<mailto:[log in to unmask]>
Office: 214.743.6671
Mobile: 214.490.0748
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