A Case Study of the Geomagnetic Induced Current (GIC) Level from the Neighboring System

摘要

During a Geomagnetic Disturbance (GMD) event, Geomagnetic Induced Current (GIC) will enter into the transmission system through the ground wire of the Wye-grounded transformer. Since the GICs will occur across the utilities, including the GICs entering from the neighboring system is necessary in the analysis. The size of the neighboring system (boundary of the neighboring system) included in the study model may change the GIC level in the study area significantly. A case study was performed to evaluate the GIC levels from the neighboring system by changing the size of the neighboring system included in the study model. The study cases were developed with the different sizes of the neighboring system with a study utility (Lubbock Power & Light) and its neighboring system data. GIC module of Siemens PTI's Power System Simulator for Engineers (PSS?E) software was used in the analysis. This paper discusses the observed GIC levels coming into a study utility and its correlation to the size of the neighboring system included in the model. The modeling portion of this case study satisfied Requirement R2 of the NERC TPL-007-1 standard.