【摘要】 多端口混合直流断路器是一种可同时保护多条线路,且投资成本相对较低的新型断路器拓扑,在多端直流配电系统中具有广阔应用前景。文中针对晶闸管换流式多端口混合直流断路器进行研究,介绍了其用于N条线路保护的拓扑图,详细分析在正常运行、故障运行以及重合闸运行时断路器的保护动作过程及电路换流状态。最后,在PSCAD/EMTDC软件内搭建了三端MMC直流输电系统仿真模型,通过分析断路器在故障点的故障切除特性,验证了多端口混合直流断路器拓扑结构的可行性和有效性。更多还原

【Abstract】 Multi-port hybrid DC circuit breaker is a new type of circuit breaker topology which can not only protect multiple lines simultaneously,but also has relatively low investment cost. It has a broad application prospect in multiport DC distribution system. In this paper,the thyristor commutative multi-port hybrid DC circuit breaker is studied and its topology for N lines protection is introduced. The protection action and circuit commutation state of the circuit breaker in normal operation,fault operation and reclosing operation are analyzed in detail. Finally,a simulation model of three-terminal MMC DC transmission system is set up in PSCAD/EMTDC software. The feasibility and effectiveness of the multi-port hybrid DC circuit breaker topology are verified by analyzing the fault removal characteristics of the circuit breaker.更多还原