基于Kriging法的直流接地极附近大地电性结构建模方法

doi:10.19595/j.cnki.1000-6753.tces.191195

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摘要大地电性结构模型不准确是造成接地极入地电流对交流电网影响评估准确度低的主要原因。由于大地电阻率原始数据不足,只能依靠过于简化的大地模型计算偏磁电流。针对建模精度低的问题,提出利用大地电磁测深纵深剖面数据,对剖面间未知散点大地电阻率进行Kriging预测,形成散点大地电阻率模型,并结合多种子区域生长法将散点大地电性结构进行区块化处理。利用±800kV扎青直流输电工程扎鲁特接地极周边变电站偏磁电流的实测数据,证明Kriging法建立的大地电性结构模型准确度更高。

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	司远
	王泽忠
	刘连光
	李海明
	邵文国

关键词 ：接地极, Kriging法, 大地电阻率, 多种子区域生长法

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.

Key words： Grounding electrode Kriging method earth resistivity multi seed region growing method

收稿日期: 2019-09-17

PACS:

TM154.1

基金资助:国家自然科学基金资助项目（51577060）

通讯作者: 司远男,1993年生,博士研究生,研究方向为电网安全运行与灾变控制。E-mail：1172201017@ncepu.edu.cn

作者简介: 王泽忠男,1960年生,博士,教授,博士生导师,研究方向为电力系统电磁兼容和电磁场数值计算。E-mail：wzzh@ncepu.edu.cn

引用本文:

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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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.191195 https://dgjsxb.ces-transaction.com/CN/Y2020/V35/I21/4448

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