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| Study on the Induced Geoelectric Field of Geomagnetic Storm Considering the Underground Anisotropic Medium |
| Wang Zezhong1, Si Yuan1, Liu Lianguang2 |
1. Beijing Key Laboratory of High Voltage and EMC North China Electric Power University Beijing 102206 China;
2. School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China |
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Abstract Geological survey data show that there are electrically anisotropic media underground, so the influence of anisotropic media should be considered when studying the geomagnetic disturbance (GMD) geoelectric field. The earth conductivity model including anisotropic medium is established to study the influence of uneven electrical structure and anisotropic medium on the distribution of earth electric field. Combined with the data in Xinjiang, an anisotropic conductivity model is constructed to calculate the GMD geoelectric field. Compared with the isotropic earth conductivity model, it is found that the change of principal axis conductivity in the anisotropic region will affect the geoelectric field in the corresponding direction and the surrounding geoelectric field in the region, and its change law is related to the high conductivity or high resistance area around the anisotropic region. The geomagnetically induced current (GIC) is obtained by combining the structural parameters of the power grid. It is proved that although anisotropic media have little influence on the size of the surface induced geoelectric field, the calculation error of GIC will increase due to the accumulation of errors due to the equivalent voltage source obtained by integrating the geoelectric field along the transmission line when calculating the GIC.
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Received: 11 December 2020
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2022, Vol. 37 
