金沙江一期UHVDC工程三换流站共用接地极的研究  

Research on Common Earth Electrode by Three Converter Stations in Jinsha River UHVDC Phase I Project

作　　者：曾连生[1] 

机构地区：[1]中南电力设计院,武汉市430071

出　　处：《电力建设》2007年第9期8-12,共5页Electric Power Construction

摘　　要：针对接地极极址选择困难和基于与独立接地极的技术经济比较结果,提出了金沙江一期±800 kV特高压直流外送工程三换流站共用接地极的设计方案。该方案在减少地电流对环境的影响方面有明显的优势;系统的安全和可靠性,可以通过极址选择和在接地极设计中得到解决;不仅可节省极址用地,并可大幅降低工程总造价。但是,多换流站共用接地极需要加强调度联系,避免多直流输电系统同极性以大地返回方式运行。Aiming at the difficulties in site selection of earth electrode as well as technical and economic comparisons of individual earth electrode, a common earth electrode by three converter stations design for the Jinsha River Phase I outgoing ＋$00 kV UHVDC project is presented. This design has advantages in reducing influences of earth currents on environment; the system safety and reliability issues can be solved by electrode site selection and electrode design; it not only reduces land uses, but also lowers overall cost of the project. However, common earth electrode by multiple stations requires better dispatching and communication to avoid same polarities in DC transmission system using ground as returning path.

关 键 词：金沙江一期 特高压直流输电 共用接地极 地电流 环境影响 

分 类 号：TM721.1[电气工程—电力系统及自动化]