高压直流线路行波差动保护的分析  

Differential Protection Analysis for Traveling Wave of HVDC Power Transmission Line

作　　者：仇琦玮[1] 徐佳康[1] 曹炜[1] 

机构地区：[1]上海市电力公司奉贤供电公司,上海201400

出　　处：《华东电力》2013年第10期2103-2107,共5页East China Electric Power

摘　　要：从行波传递的原理分析了故障暂态过程中直流线路分布电容电流的形成机理,以及分布电容电流对直流差动保护的不利影响。经理论分析验证得,故障暂态过程中线路分布电容电流的大小与故障信号传递至线路两端保护的时间差成正比。在此基础上,提出了一种基于暂态过程分布电容电流补偿的直流差动保护方案,通过合理地补偿线路两端保护接收到故障信号的时差,可以有效地提高直流差动保护的可靠性及灵敏度。大量的仿真实验证实了该保护方案适用于一般高压直流输电线路保护。This paper analyzes the formation mechanism of distributed capacitive current in DC line in the fauh transient process based on the principle of traveling wave transmission, as well as the negative impact of the distributed capacitance current on DC differential protection. It has been theoretically verified that the distributed capacitance current in the fault transient process is proportional to the time difference between fault signal transmissions to both ends of the line protection. Thereupon, a DC differential protection scheme is proposed based on the distributed capacitance current compensation in the transient process, whereby through the reasonable compensation for the time difference, the reliability and sensitivity of DC differential protection can be effectively improved. A large number of simulation experiments verify that the protection scheme is applicable to general HVDC power transmission line protection.

关 键 词：高压直流输电线路 行波传递 分布电容电流 故障暂态 差动保护 

分 类 号：TM773[电气工程—电力系统及自动化]