换流站交流电源窜入低压直流系统引起保护误动的影响因素

Factors Influencing Protection Miss Operation Caused by AC Power Source Breaking into Low Voltage DC System in Converter Stations

文章介绍了交流电源窜入低压直流系统的机理及特点,在此基础上利用PSCAD软件搭建交直流窜电仿真模型,总结交直流窜电故障典型特点,探究了交流电源窜入初相角、极性、地点等因素对其引起保护误动的影响,为防范交直流窜电引起保护误动提供参考。

The mechanism and characteristics of AC power channeling into low-voltage DC system were introduced. On this basis, the simulation model of AC and DC power channeling was built by PSCAD software, and the typical characteristics of AC and DC power channeling fault were summarized. The influence of initial phase angle, polarity and location of AC power channeling on the protection miss operation caused by AC and DC power channeling was explored, so as to provide reference for preventing the protection miss operation caused by AC breaking into DC.