一种评估直流接地极影响地电场监测的高精度方法  

A High Precision Method for Evaluating the Impact of DC Grounding Electrode on Geoelectric Field Monitoring

作　　者：穆永保[1] 闫柯柯[1] 岳国良 苗靓 刘林[1] 奚涛 MU Yong-bao;YAN Ke-ke;YUE Guo-liang;MIAO Liang;LIU Lin;XI Tao(State Grid Handan Electric Power Supply Company,Handan 056035,China;State Grid Hebei Electric Power Co,Ltd,Shijiazhuang 050000,China;Anhui Zhengguang Power Technology Co,Ltd,Hefei 230088,China)

机构地区：[1]国网邯郸供电公司,河北邯郸056035 [2]国网河北省电力有限公司,河北石家庄050000 [3]安徽正广电电力技术有限公司,安徽合肥230088

出　　处：《数学的实践与认识》2020年第14期128-134,共7页Mathematics in Practice and Theory

基　　金：国家电网公司科技项目(SGHEHD00JXJS700612)。

摘　　要：直流输电工程在单极故障运行时,高达数千安的大地返回电流将对地电场监测产生严重干扰,如何准确评估直流接地极的影响范围和程度自然成为了地电场监测需要解决的重要问题.首先对处于水平多层大地情况下接地极的地电场分布进行了理论分析,推导得到了地电场的计算公式,然后在地质学经典线性滤波法KONG-201法的基础上引入多精度算法做改进,求解复杂水平多层结构土壤环境下直流接地极的地电场分布.针对某实际工程案例,仿真结果表明,改进KONG-201法与电力系统接地仿真方法高阶复镜像法(HOCIM)的计算结果完全一致,并且本文方法的计算速度更快,精度更高.论文方法为评估直流接地极影响地电场监测提供了有效参考.When the DC transmission project is operating in a unipolar fault,the return current up to thousands of amperes will seriously interfere with the monitoring of geoelectric field.How to accurately evaluate the impact range and extent of DC grounding electrode has naturally become an important problem to be solved in geoelectric field monitoring.In this paper,we theoretically analyze the geoelectric field of ground electrode in horizontal wide-area multi-layer earth,and derive the geoelectric field calculation formula.Then the multi-precision algorithm is introduced on the basis of the classical linear filtering method KONG-201,which is used to improve solving geoelectric field distribution of the grounding electrode.The simulation results show that the KONG-201 method is consistent with the highorder complex mirror method(HOCIM)of the power system grounding simulation method,and with faster speed calculation and the higher precision.The method in this paper provides an effective reference for evaluating the impact of DC grounding electrode on geoelectric field monitoring.

关 键 词：地电场分布 直流接地极 线性滤波法 多精度算法 数值计算 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM862