The Finte Element Analysis Of Magnetic Storm Magento-Telluric Field Based On The 3D Electrical Structure

The high-speed moving charged particles flow carried by the solar wind has caused violent geomagnetic field changes and induced the electric field on the ground surface. When the transformer neutral point in the power system is grounded, a potential difference will form between the neutral point, and the geomagnetic induced current flows through the transmission line through, which will have a negative impact on the safe and stable operation of the power system. As China's geographical situation is very complex, the ground electric field mutation caused by the imbalanced geodetic conductivity distribution cannot be ignored, therefore the calculation of ground electric field has become the key factor to study the influence of magnetic storm on power system. Currently, the modeling of the earth conductivity is mostly one-dimensional and two-dimensional model, failing to take full account of the changes in the horizontal direction of the earth conductivity.The key of calculating the geomagnetic induced current in power network lies in the calculation of the induced electric field. Based on the analysis of the current source form and the earth electrical structure, this paper gives full consideration of the complex structure of the earth conductivity, makes the field source when the magnetic storm occurs equivalent to a certain height of the sheet surface current on the ground surface and makes 3D modeling of the earth conductivity.This paper analyzes the distribution law of geoelectric field under different frequency field source with the finite element method, studies the ground field mutation caused by the conductivity change in the horizontal direction. The research indicates that the three dimensional distribution of conductivity has a greater impact on the calculation of the ground potential difference, and the calculation of the first &end potential difference by only...