逆变站换流阀差动保护动作波形分析

Analysis of Action Waveform of Converter Valve Differential Protection in Inverter Station

换流阀是直流输电系统中的重要设备,换流阀差动保护是针对换流阀区域接地故障的重要保护,其故障形式和原理与交流系统有很大区别,不同区域的接地故障波形特征也有所不同。换流阀差动保护动作后,为提高清洁能源可利用率,尽快恢复直流运行,需较早确定故障点以开展检修工作。根据换流原理和软件仿真,对换流阀差动保护覆盖的各区域接地故障波形进行分析,总结不同区域接地故障的典型特点,有助于快速故障定位。

Converter valve is an important equipment in DC transmission system,the converter valve differential protection is an important protection against the grounding fault in the area of converter valve.Its fault form and principle are very different from that of AC system,and the waveform characteristics of grounding fault in different areas are also different.After the valve differential protection action occurs,in order to improve the availability of clean energy and restore DC operation as soon as possible,it is necessary to determine the fault point earlier to carry out maintenance.According to the converter principle and software simulation,the waveform of grounding fault in each area covered by valve differential protection are analyzed,and the typical characteristics of grounding fault in different areas are summarized,which are helpful to quickly judge the fault location.