Modeling Method of Geoelectric Structure Near DC Grounding Electrode Based on Kriging Method
Si Yuan1, Wang Zezhong1, Liu Lianguang2, Li Haiming3, Shao Wenguo3
1. Beijing Key Laboratory of High Voltage and EMC North China Electric Power University Beijing 102206 China; 2. State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China; 3. State Grid Inner Mongolia Eastern Power Co. Ltd Huhhot 010000 China
Abstract：The inaccuracy of geoelectric structure model is the main reason for the low accuracy of the impact assessment of grounding electrode current on AC power grid. Due to insufficient original data of earth resistivity, the bias current can only be calculated by relying on an oversimplified earth model. Aiming at the problem of low modeling accuracy, this study proposes to use the depth profile data of magnetotelluric sounding to make Kriging prediction of the unknown scattered point resistivity between the sections, and form the scattered point earth resistivity model, and combine the multi seed region growth method to block the scattered point geoelectric structure. Using the measured data of the bias current of the substation around the Zhalute grounding electrode of the ±800kV Zhaqing DC transmission project proves that the electrical structure model established by the Kriging method is more accurate.
司远, 王泽忠, 刘连光, 李海明, 邵文国. 基于Kriging法的直流接地极附近大地电性结构建模方法[J]. 电工技术学报, 2020, 35(21): 4448-4454.
Si Yuan, Wang Zezhong, Liu Lianguang, Li Haiming, Shao Wenguo. Modeling Method of Geoelectric Structure Near DC Grounding Electrode Based on Kriging Method. Transactions of China Electrotechnical Society, 2020, 35(21): 4448-4454.
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2020, Vol. 35 
