Calculation of induced geoelectric field distribution in wide area geomagnetic storms based on time harmonic fitting

Abstract

Ate magnetic field that changes during the magnetic storm will produce the geomagnetic ally induced current (GIC), which will threaten the safe operation of the power grid. It is very important to accurately calculate the effect of GIC on the effect of magnetic storm on the power grid. In order to discuss the actual influence of magnetic storm on the power grid, the sinusoidal function is synthesized by the harmonic fitting method, which is equivalent to the maximum variation rate of the geomagnetic field in the time domain. The amplitude and frequency of the sinusoidal function are selected to calculate the frequency in the frequency domain, so that the calculation is more convenient and rapid. And select the typical magnetic storm of November 7-9, 2004, take the one dimensional stratified earth resistivity model as an example, use the finite element method to calculate the intensity distribution of the wide area electric field, and find that the North China and Southern China region are more seriously affected by the magnetic storm.