Single-Terminal Protection of Flexible DC Transmission Lines Based on Fault Voltage Traveling Wave
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 expres-sions 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.
flexible DC transmissionsingle-end volume protectionfault traveling waveL-M algorithm
万方数据
维普
