A Multi-Port Current-Limiting Hybrid DC Circuit Breaker Based on Thyristors

Multi-port hybrid DC circuit breakers (MP-HCBs) are rapidly developing due to their obvious advantages in economy compared to traditional two-port hybrid circuit breakers (HCBs). However, most of the existing MP-HCB topologies do not have the current-limiting capability, and a large number of insulated-gate bipolar transistors (IGBTs) are still needed in their main breakers. In response to the problems, a multi-port current-limiting hybrid DC circuit breaker (MP-CLHCB) based on thyristors is proposed in this paper. MP-CLHCB uses low-cost thyristors instead of IGBTs, and suppresses the rise of fault current through current-limiting branch. In an attempt to prevent the MP-CLHCB from reclosing in a permanent fault and causing damage to the DC grid again, an adaptive reclosing scheme is also proposed. In this paper, the topology, operation stages, theoretical derivation, and parameter design of the MP-CLHCB are provided. Finally, the performance of the MP-CLHCB is verified and compared through simulations in PSCAD/EMTDC. (c) 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.