特高压直流接地极优化选址研究  

Research on Optimal Location of UHVDC Grounding Electrode

作　　者：曾富 樊艳芳[1] 耿山 ZENG Fu;FAN Yanfang;GENG Shan(School of Electrical Engineering,Xinjiang University,Urumqi 830047,China;State Grid HanDan Electric Power Supply Company,Hebei Handan 056000,China)

机构地区：[1]新疆大学电气工程学院,乌鲁木齐830047 [2]国网邯郸供电公司,河北邯郸056000

出　　处：《高压电器》2020年第10期205-211,共7页High Voltage Apparatus

基　　金：2017年度新疆维吾尔自治区自然科学基金项目(2017D01C028)。

摘　　要：为了减小特高压直流接地极入地电流对交流电网直流偏磁的危害,文中从优化直流接地极位置角度出发减小交流电网中直流偏磁危害。研究断裂构造与岩土类型对直流接地极预选选址的影响,并将预选极址采用网格点模式法划分网格区域,以直流偏磁站点数量最少与交流电网中直流电流总量最低为目标,筛选优化预选址区域,并确定最终直流接地极位置。研究表明:直流接地极极址应远离断裂构造,且极址应选择在地表为低阻率土壤以及地下为高阻率岩石区域,合理的直流接地极位置从源头上降低了直流接地极所引起的直流偏磁对交流电网的影响。In order to reduce the harm of grounding current of UHVDC grounding electrode to DC bias in AC power network,the harm of DC bias in AC power network is reduced by optimizing the position of DC grounding electrode.The influence of fault structure and geotechnical type on DC grounding electrode pre⁃selection is studied.The pre⁃se⁃lection electrode location is divided into grid areas by grid point mode method.Aiming at the minimum number of DC bias sites and the minimum total DC current in AC network,the pre⁃selection area is optimized and the final DC grounding electrode location is determined.The results show that the location of DC grounding electrode should be far away from the fault structure,and the location should be in the low resistivity soil on the surface and in the high re⁃sistivity rock area on the ground.The reasonable location of DC grounding pole reduces the influence of DC magnetic bias caused by DC grounding pole on AC network from the source.

关 键 词：特高压直流输电 直流接地极选址 直流偏磁 岩土类型 网格化模式方法 

分 类 号：TM721.1[电气工程—电力系统及自动化]