A Multi-Port Current-Limiting Hybrid DC Circuit Breaker

Recently the hybrid multi-port DC circuit breaker (MP-DCCB) is becoming popular in protecting HVDC grids, thanks to their reduction of power electronics devices. In this paper, an enhanced current-limiting DCCB (MP-CLCB) for multiple line protection proposed. The integrated fault current limiter (FCL) inside MP-CLCB can clear faster with slightly increased costs. To reduce energy dissipation requirement surge arresters caused by newly added path, transfer path which provides a loop inductors during decay stage designed. theoretical analysis pre-charging, current-limiting, interruption and carried out. Moreover, design principles key parameters are provided. proposed approaches verified through simulations PSCAD/EMTDC. results show that replace DCCBs, accelerate arresters.