四回高压直流共用接地极方案研究  

Research on the Scheme of Shared Grounding Electrode for Four-Circuit HVDCSystem

作　　者：刘玉 王文 LIU Yu;WANG Wen(China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou 510663,Guangdong,China;Energy Development Research Institute of China Southern Power Grid Co.,Ltd.,Guangzhou 510630,Guangdong,China)

机构地区：[1]中国能源建设集团广东省电力设计研究院有限公司,广东广州510663 [2]南方电网能源发展研究院有限责任公司,广东广州510630

出　　处：《南方能源建设》2024年第S01期29-35,共7页Southern Energy Construction

摘　　要：[目的]为解决接地极选址困难问题,采用共用接地极的方案,共用接地极可由独立接地极改造而来。四回直流共用接地极情况较为少见,其共用方案需要谨慎研究。[方法]结合实际工程,针对现存独立接地极情况,提出了极址3种接地极共用方案,通过仿真,研究垂直接地极和深井接地极跨步电压和电极分流。[结果]多个接地极同时运行时,由于导体间的屏蔽效应,其电气特征相比于独立运行有所区别,同极性运行时,无论是垂直接地极还是深井接地极,跨步电势相比于其独立运行时都有所增大,电极电流分布更不均匀。[结论]3种可行方案下,跨步电压均未超过限值,但方案一下跨步电压最小,垂直接地极电极电流分布差异不大。[Introduction]To address the difficulty in selecting the grounding electrode location,a shared grounding electrode scheme is adopted.The shared grounding electrode can be transformed from an independent grounding electrode.It is relatively uncommon for a four-circuit DC system to share a grounding electrode,so its sharing scheme needs to be carefully studied.[Method]Based on the actual project and the existing situation of independent grounding electrodes,three schemes of grounding electrode sharing at the electrode location were proposed.Through simulation,the step voltage and current distribution of vertical grounding electrodes and deep well grounding electrodes were studied.[Result]When multiple grounding electrodes operate simultaneously,due to the shielding effect between conductors,their electrical characteristics differ from those of independent operation.When operating with the same polarity,regardless of whether it is a vertical grounding electrode or a deep well grounding electrode,the step potential increases compared to when it operates independently,and the electrode current distribution is more uneven.[Conclusion]Under the three feasible schemes,the step voltage does not exceed the limit value,but the step voltage is the smallest under scheme I,and there is no significant difference in the current distribution of the vertical grounding electrode.

关 键 词：高压直流 接地极 共用 垂直接地极 深井接地极 

分 类 号：TM7[电气工程—电力系统及自动化] TM89