Modeling Calculation and Influencing Factors of Geomagnetically Induced Current in Sanhua Power Grid

Abstract The time-varying magnetic field of a magnetic storm induces an electric field in the earth, which generates geomagnetically induced currents (GIC) when it acts on the power grid and has many hazards to the power system. In this paper, we model and calculate the ground-induced electric field and geomagnetically induced currents for 20 magnetic storms from 2008 to 2018, and investigate the effects of two factors, magnetic storm strength, and earth conductivity, on the geomagnetically induced currents, which are important for the prevention and control of GIC in large-scale power grids in low- and mid-latitude regions.