华北地区大地电性结构三维建模及磁暴感应地电场有限元计算

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摘要 “三华”特高压同步电网的“东纵”和“北横”两条线路覆盖了我国华北、华中地区多个地块结构和大地断层,地质构造非常复杂。为研究磁暴时大尺度、三维电性结构下的感应地电场分布情形,采用大地电磁测深数据构建华北地区三维电导率模型。利用地磁台站记录的地磁场变化量作为地面边界条件,采用有限元法计算获得了地下感应电流和地面电场的三维分布情况。结果表明,电性结构不均匀会严重影响地面电场的空间分布。结合“东纵”和“北横”位于华北地区的线路区段,给出了拟建变电站之间电位差的变化情况,为进一步计算和评估线路中地磁感应电流的影响打下基础。

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	王泽忠
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关键词 ：磁暴, 地磁感应电流, 三维电导率模型, 有限元

Abstract：The three-dimensional earth conductivity structure is modelled by the magnetotelluric data. The three-dimensional geoelectromagnetic fields are calculated based on finite element method using the geomagnetic field data from the magnetic observatories for a specific geomagnetic disturbance. Unlike the traditional modelling techniques, air region and source region are not taken into consideration in this paper. Under this circumstance, the computation results in the earth can also be achieved due to the uniqueness theorem. The geomagnetic field variations during a selected period are applied as the boundary conditions of conductivity model. Combined with the locations of “Sanhua” UHV transmission lines, voltage differences at several substations are shown in the whole period. The geoelectric field at the earth’s surface and the induced currents in different depths are also presented at the moment of maximum voltage difference.

Key words： Geomagnetic disturbance GIC three-dimensional Earth conductivity structure finite element method

收稿日期: 2014-08-25 出版日期: 2015-04-13

PACS:

TM154.1

基金资助:国家自然科学基金（51177045、41374189）,北京市教育委员会共建项目（GJ20120006）和中央高校基本科研业务费专项资金（12QX03）资助

作者简介: 王泽忠男,1960年生,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。董博男,1986年生,博士研究生,研究方向为电力系统电磁兼容。

引用本文:

王泽忠,董博,刘春明,刘丽平,刘连光. 华北地区大地电性结构三维建模及磁暴感应地电场有限元计算[J]. 电工技术学报, 2015, 30(3): 61-66. Wang Zezhong,Dong Bo,Liu Chunming,Liu Liping,Liu Lianguang. Three-Dimensional Earth Conductivity Structure Modelling in North China and Calculation of Geoelectromagnetic Fields During Geomagnetic Disturbances Based on Finite Element Method. Transactions of China Electrotechnical Society, 2015, 30(3): 61-66.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2015/V30/I3/61

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