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Geomagnetically induced currents (GIC) can cause half cycle saturation of transformers and adversely affect the security operation of the power system, even result in large area blackouts. It may be possible to reduce the magnitude of GIC by installing small resistor or capacitor into transformers in a power grid. To compare the mitigation effect of the two schemes including small resistor and capacitor, four evaluation indexes used to assess the level of GIC are defined and the GIC level of 750/330kV power grid of Gansu province in China are evaluated considering five different mitigation configurations. It is found that the two schemes can decrease the magnitude of GIC relative to no installing mitigation device, but there is no obvious different between the two schemes to mitigate the GIC, and reduce the risk of GIC on power grid. By installing the small resistors or capacitor in 750kV substations, the mitigation effect is better than the 330kV substations. Keywords—GIC; neutral point; power grid; mitigation scheme

Comparison Analysis of the Effects of Small Resistor and Capacitor on Mitigation GIC in Power Grid