面向光储直柔配电系统的共享注入单元型多端口串联混合直流断路器OA

Photovoltaic-storage DC flexible distribution systems typically adopt a multi-branch common DC bus architec⁃ture.Conventional schemes require independent parallel hybrid DC circuit breakers for each branch,which suffer from high system cost and long fault interruption time.Aimed at these problems,a multi-port series hybrid DC circuit break⁃er based on a shared voltage injection unit is proposed.First,an equivalent circuit model of the multi-port DC distribu⁃tion network is established to analyze the operating mechanism and operation modes under single-port and multi-port continuous faults.Second,parameter design methods for key components such as pulse transformers and energy storage capacitors are proposed based on theoretical analysis.Finally,the effectiveness of the proposed scheme is verified through simulation based on the Matlab/Simscape physical model of the common-bus multi-port photovoltaic-energy-stor⁃age DC flexible power distribution system.The results show that the proposed circuit breaker can rapidly suppress sin⁃gle-port and multi-port continuous fault currents(100A/47.7μs)while ensuring balanced operation of internal devices in the injection unit.Furthermore,the shared mechanism effectively reduces device redundancy and overall system cost.