柔性直流换流站直流接地点选择探讨  

Discussion on Selection of DC Grounding Point for Flexible DC Converter Station

作　　者：王赞[1,2] 方乙君[3] 梅念 王雄文[3] 陈东[2] 王伟[1] 张照青[4] WANG Zan;FANG Yijun;MEI Nian;WANG Xiongwen;CHEN Dong;WANG Wei;ZHANG Zhaoqing(Beijing Key Laboratory of High Voltage &EMC,State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China;Fujian Electric Power Survey and Design Institute,Fuzhou 350003,China;Beijing Hualian Power Engineering Supervision Company,Beijing 100070,China)

机构地区：[1]华北电力大学高电压与电磁兼容北京市重点实验室,新能源电力系统国家重点实验室,北京102206 [2]国网北京经济技术研究院,北京102209 [3]福建省电力勘测设计院,福州350003 [4]北京华联电力工程监理公司,北京100070

出　　处：《高压电器》2018年第12期212-217,共6页High Voltage Apparatus

基　　金：国家重点研发计划资助项目(2016YFB0900905).

摘　　要：为了保障人的安全和设备绝缘免于被破坏,文中通过对一种真双极柔性直流输电工程主接线存在的可能运行方式进行分析,提出了系统安全运行的接地方式,并比较了在单端接地运行方式下,设立独立的直流工作接地极和与换流站共用接地极的优缺点。最后通过计算分析得出采用共用接地极,在发生单相接地故障时,地网电位的升高对设备和人身安全的影响,提出了可靠的运行方式和接地方案。In order to protect people’s safety and protect the equipment from being destroyed,the possible operation way of a true bipolar flexible DC transmission project is analyzed in this paper.The grounding of system security operation is proposed based on the analysis.In a single-grounded mode of operation,the advantages and disadvantages,separate DC grounding electrode and common grounding with the converter station pole,is compared.Finally,in the event of single-phase ground fault occurs,the impact of equipment and personal safety is analyzed after increased ground potential,based on the calculation and analysis of sharing earth electrode,a reliable operation mode and grounding scheme is put forward.

关 键 词：柔性直流输电 换流站 接地点 单相接地故障 直流偏磁 

分 类 号：TM721.1[电气工程—电力系统及自动化]