超高速直流输电线路保护方向元件  

Ultra-high-speed directional element of relay protection for HVDC transmission line

作　　者：孔飞[1] 张保会[1] 王艳婷[1] 甄威[2] 张爱玲[3] 

机构地区：[1]西安交通大学电气工程学院,陕西西安710049 [2]四川电力科学研究院,四川成都610072 [3]许继集团有限公司,河南许昌461000

出　　处：《电力自动化设备》2014年第8期83-88,共6页Electric Power Automation Equipment

基　　金：国家电网科技项目~~

摘　　要：为提高直流输电线路单端暂态量保护的可靠性与灵敏度,提出了一种基于故障行波能量的超高速直流输电线路故障方向元件,该元件基于不同故障方向时故障前行波与反行波能量之间大小的差异有效判别故障方向。利用由RTDS与现场控制保护装置的闭环测试系统,对该方向元件性能进行了测试。测试结果表明,该方向元件适用于不同电压等级输电工程,在直流输电工程不同运行方式下,均可以超高速正确判别故障方向,且不受故障位置、过渡电阻的影响,可以有效提高单端暂态量保护性能,并可构成纵联方向保护。In order to improve the reliability and sensitivity of single-terminal transient-based protection,an ultra-high-speed directional element is proposed for the relay protection of HVDC transmission line,whlch effectively determines the fault direction according to the difference between the forward traveling wave energy and the backward traveling wave energy when different fault directions exist. A closed-loop test system consisting of RTDS and HVDC control ＆ protection devices is built to test the performance of proposed directional element. Results show that,immune to the fault location and transition resistance and suitable for different voltage levels and different operating modes of HVDC projects,it determines the fault direction accurately and rapidly,which improves the performance of single-terminal transient-based protection effectively. Besides,it can be used to form a pilot directional protection.

关 键 词：高压直流输电 继电保护 方向元件 平波电抗器 信号衰减 故障行波 行波能量 

分 类 号：TM77[电气工程—电力系统及自动化]