交流系统故障对德宝HVDC换相失败的影响分析

针对交流系统故障可能导致换流站换相失败的问题,在德阳换流站及四川电网实际设备情况的基础上建立仿真模型,通过对西北电网进行等值处理,利用关断角判断法,分析了四川500 kV电网在发生线路对称故障、不对称故障及严重故障情况下德阳换流站换相失败的可能性。仿真结果表明,由于四川电网系统足够坚强,在正常情况下,四川电网交流侧故障不会引起德阳换流站发生换相失败。

Influence Analysis of AC System Faults on Deyang-Baoji HVDC Transmission System Commutation Failure

According to commutation failure caused by ac system fauh, the paper establishes the simulation model based on the actual equipment situation of Deyang convert station and Sichuan power system. Based on Northwest power grid equivalents, the paper simulates and analyzes the possibility of the commutation failure when symmetric faults, asymmetric faults and severe faults of transmission lines occurs by means of turn-off angle judgment method. The simulation results show that, for strong Sichuan power grid, the commutation failure doesn＇t occur in Deyang convert station when the ac system fauh occurs under normal condition.