交直流混合系统中隔离开关三相不一致状态下非故障相拒动分析及改进措施

Non-Failure Phase Rejection Analysis and Improvement Measures under Isolation Switch Three Phase Inconsistent State in AC/DC Hybrid Systems

随着清洁能源发电、电动汽车、柔性负荷的大量接入配电网,采用双向多端电力电子变换器构成的交直流混合系统快速发展。隔离开关作为交直流混合系统中的重要设备,对其研究具有重要意义。结合一起倒闸操作过程中发生的隔离开关三相不一致案例,分析了可能引起隔离开关三相不一致的原因,描述了隔离开关在三相不一致状态下的分合闸过程,最后详细给出了非故障相拒动原因及其改进措施。

With a large number of clean energy generation,electric vehicles and flexible loads access to distribution networks,AC-DC hybrid systems using bidirectional multi-terminal power electronic converters develop rapidly and it is important to study isolating switch,which is taken as an important equipment in the AC-DC hybrid system. Combining a three-phase inconsistency case of isolation switch during the operation,this paper analyzes the possible causes of inconsistent three-phase for isolation switch,and described the switching process of isolating switch in the three-phase inconsistency. Finally,the reason of non-failure phase rejection and its improvement measures were given in detail.