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During geomagnetic disturbances (GMDs), the variations in electrojet can drive geomagnetically induced currents (GIC) along transmission lines and through transformer windings to ground. The quasi-DC GIC flow in transformer windings can cause half-cycle saturations of transformer cores, resulting in transformer hotspot heating and increased reactive power losses. Such negative effects can potentially cause catastrophic damage on transformers and severely impact the ability of a power system to reliably deliver power. In this work, we propose an optimization model for the transmission grid considering GIC produced by different levels of GMD events. The problem is formulated as an AC optimal transmission switching problem (AC-OTS) during GMD, in which the DC current induced by the GMD event is coupled with the AC optimal power flow. We demonstrate on a modified 24- node, IEEE RTS96 system and the option of line switching is effective to mitigate the effects of GIC on the grid. Host: Chris Neale |