The development of DC microgrids has received extensive attention. Different from traditional single-terminal DC systems, due to the access to distributed power sources and energy storage systems, the DC microgrid has the characteristic of bidirectional power flow. Therefore, solid-state circuit breakers are required to be able to clear faults in both directions. This paper proposes a novel self-powered bidirectional solid-state circuit breaker (BSSCB) topology. First, the basic structure of the self-powered BSSCB is presented. Then, the operation principle of the proposed self-powered circuit is analyzed in detail. Finally, a BSSCB prototype is constructed and tested. The experimental results show that the proposed self-powered BSSCB can isolate the short-circuits faults quickly. Meanwhile, it maintains a safe and stable self-power whether the short-circuit fault occurs on either side of BSSCB.
