基于故障电压行波的柔性直流输电线路单端量保护  

Single-Terminal Protection of Flexible DC Transmission Lines Based on Fault Voltage Traveling Wave

作　　者：陈国训 CHEN Guo-xun(State Grid Hubei Electric Power Co.Ltd.,DC Company,Yichang 443000,China)

机构地区：[1]国网湖北省电力有限公司直流公司,湖北宜昌443000

出　　处：《电气开关》2024年第6期70-73,共4页Electric Switchgear

摘　　要：传统柔性直流输电线路保护普遍存在灵敏性、可靠性以及速动性等方面的问题,使得保护效果不佳。为解决上述问题,从故障电压行波角度出发,首先,对柔性直流输电线路发生线路故障后故障行波的波形特征进行数学分析,得到区内、外故障电压行波时域表达式的差异;其次,利用L-M算法以提取区内外故障电压行波波形的特征差异,进而提出一种基于故障电压行波的柔性直流输电线路单端量保护方法;最后,通过算例仿真验证,所提方法能正确识别所有类型的直流线路故障,具有较高的灵敏性、可靠性以及速动性。The traditional flexible DC transmission line protection generally has problems of sensitivity,reliability and quickness,which makes the protection effect no better.In order to solve above problems,this paper starts from the perspective of fault voltage traveling wave.Firstly,the waveform characteristics of fault traveling wave in flexible DC transmission line after line fault occur are mathematically analyzed,and the differences in time domain expressions of fault voltage traveling wave between in-zone and out-zone are obtained.Secondly,the L-M algorithm is used to extract the characteristic difference of fault voltage traveling wave shape inside and outside the zone,and then a single-terminal protection method of flexible DC transmission line based on fault voltage traveling wave is proposed.Finally,the simulation results show that the proposed method can correctly identify all types of DC line faults,and has high sensitivity,reliability and quickness.

关 键 词：柔性直流输电 单端量保护 故障行波 L-M算法 

分 类 号：TM72[电气工程—电力系统及自动化]