Series capacitors are used in the bulk power system to re-direct power flow and improve system stability. Series capacitors present very high impedance to the flow of GIC. NERC has recommended two modeling methods in their GIC application guide: model the series capacitor with a very large resistance such as 1 or remove the line segment representing the series capacitor megohm (MΩ); from the model completely. In the ERCOT GIC system model, the PGDTF has decided to use the 1 method for all series capacitors. MΩ Substation Data The format for the Substation Data record is shown in Appendix B. This Substation Data record will be provided by the facility owner. Field Description Source TSPs will model station/bus relationship for their facilities in accordance with Station Number A unique – Appendix station numbering system A. Substation separate but similar to the bus numbering system. ERCOT will model station/bus relationship for Resource Entity (RE) facilities in TSPs will model station/bus relationship accordance with Appendix A. for their facilities in accordance with Comma separated list of Bus Appendix List of Buses Numbers that belong in this A. station. ERCOT will model station/bus relationship for RE facilities in accordance with Appendix A. ERCOT will provide long or short name for RE stations. NAME Station Name TSPs will provide long or short name for their stations. ERCOT will provide for RE stations. LATITUDE Station Latitude in degrees TSPs will provide this data for their stations. ERCOT will provide for RE stations. LONGITUDE Station Longitude in degrees TSPs will provide this data for their stations. Substation dc grounding ERCOT will provide for RE stations. resistance (ohms) for stations RG with high side wye grounded TSPs will provide this data for their transformers and shunt reactors. stations. EARTH MODEL Name of the Earth Model EARTH MODEL is USGS standard earth ROS Approved: June 9, 2016
Series capacitors are used in the bulk power system to re-direct power flow and improve system stability. Series capacitors present very high impedance to the flow of GIC. NERC has recommended two modeling methods in their GIC application guide: model the series capacitor with a very large resistance such as 1 megohm (MΩ); or remove the line segment representing the series capacitor from the model completely. In the ERCOT GIC system model, the PGDTF has decided to use the 1 MΩ method for all series capacitors. Substation Data The format for the Substation Data record is shown in Appendix B. This Substation Data record will be provided by the facility owner. Field Description Source Substation Station Number – A unique station numbering system separate but similar to the bus numbering system. TSPs will model station/bus relationship for their facilities in accordance with Appendix A. ERCOT will model station/bus relationship for Resource Entity (RE) facilities in accordance with Appendix A. List of Buses Comma separated list of Bus Numbers that belong in this station. TSPs will model station/bus relationship for their facilities in accordance with Appendix A. ERCOT will model station/bus relationship for RE facilities in accordance with Appendix A. NAME Station Name ERCOT will provide long or short name for RE stations. TSPs will provide long or short name for their stations. LATITUDE Station Latitude in degrees ERCOT will provide for RE stations. TSPs will provide this data for their stations. LONGITUDE Station Longitude in degrees ERCOT will provide for RE stations. TSPs will provide this data for their stations. RG Substation dc grounding resistance (ohms) for stations with high side wye grounded transformers and shunt reactors. ERCOT will provide for RE stations. TSPs will provide this data for their stations. EARTH MODEL Name of the Earth Model EARTH MODEL is USGS standard earth ROS Approved: June 9, 2016
Procedure_Manual_PGDTF_06022016.docx