Evaluating the Influence of Lateral Change of Conductivity on the “H Polarization” of Induced Geoelectric Field and Geomagnetically Induced Currents
Liu Chunming1, Lin Chenxiang2, Wang Xuan1, Liu Lianguang1, Huang Caichen1
1. School of Electrical & Electronic Engineering North China Electric Power University Beijing 102206 China;; 2. Fujian Electric Power Reserch Institute Fuzhou 350007 China
Abstract：During magnetic storms, the induced geoelectric fields drive geomagnetically induced currents (GIC) in power transmission networks, railway systems and pipelines, resulting in negative effects on those systems. In the region with complex geological structure, such as coast area, the lateral change of earth conductivity will cause distortion in the distribution of induced geoelectric field. The coast effect is a typical distortion of geoelectric field in the “H polarization” case and it has obvious impacts on GIC. This paper simulated the influence of the “H polarization” on the earth electric field due to magnetic storm. After establishing the earth model with lateral conductivity change, this paper used the finite element method to solve the boundary problem of the induced telluric current field. Thus, the relationship between conductivity lateral change and electric field distortion was discussed based on the numerical results. Additionally, this paper also discussed the variation of GIC in the power grid due to the lateral conductivity change and the distance between substation and the conductivity interface. The method and the results lay a theoretical foundation for the accurate calculation of GIC in the power grid.
刘春明, 林晨翔, 王璇, 刘连光, 黄彩臣. 大地电导率横向变化对地磁暴感应电场H极化及地磁感应电流的影响[J]. 电工技术学报, 2016, 31(24): 113-119.
Liu Chunming, Lin Chenxiang, Wang Xuan, Liu Lianguang, Huang Caichen. Evaluating the Influence of Lateral Change of Conductivity on the “H Polarization” of Induced Geoelectric Field and Geomagnetically Induced Currents. Transactions of China Electrotechnical Society, 2016, 31(24): 113-119.
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2016, Vol. 31 
