高压直流输电系统接地极过压保护机理及改进措施研究  

Principle and Improvement of the Earth Electrode Overvoltage Protection for an HVDC Project

作　　者：冯鸫[1,2] 罗海志[3] 杨洁民[4] 郭琦[1] 

机构地区：[1]中国南方电网超高压输电公司检修试验中心,广州510663 [2]华南理工大学电力学院,广州510640 [3]中国南方电网超高压输电公司南宁局,南宁530028 [4]中国南方电网超高压输电公司天生桥局,兴义562400

出　　处：《高压电器》2011年第12期49-55,共7页High Voltage Apparatus

摘　　要：笔者主要分析贵广二回直流输电系统接地极过压保护动作情况,并提出改进措施。首先介绍了接地极过压保护(59EL)原理及动作后果;然后介绍了接地极过压保护(59EL)的保护逻辑,通过分析贵广二回直流在调试过程中59EL保护的动作情况,指出了目前运行中的接地极过压保护的缺陷。为消除保护逻辑缺陷,避免接地极过压保护(59EL)误动作导致单极闭锁、造成双极相继闭锁的扩大事故,提高直流输电系统运行的可靠性,笔者提出了修改贵广二回直流系统接地极过压保护(59EL)逻辑、改进极控系统、直流站控系统程序的改进方案,最后,通过仿真手段对所提出的改进措施进行了试验验证。The principle of the earth electrode overvoltage protection of the Gui-Guang H HVDC Project is analyzed, and the protection logic of the earth electrode overvoltage protection （59EL） is described. Through analyzing the behaviour of 59EL in the commissioning process of the Gui-Guang II HVDC Project, the bugs in the 59EL are found. In order to eliminate the bugs in protection logiccavoid the monopolar block or even bipolar blocks due to misoperation of 59EL, and improve the reliability of HVDC operations, some improvement solutions are offered for modifying 59EL logic in the Gui-Guang II HVDC Project, and improving the programs of pole control system and DC station control system. In addition, RTDS simulations are conducted to verify the proposed improvement solutions.

关 键 词：直流输电工程 接地极过压保护 直流极控系统 直流站控系统 改进措施 实时数字仿真 

分 类 号：TM862[电气工程—高电压与绝缘技术]