A Novel Efficient Bidirectional T-source Circuit Breaker for Low Voltage DC Distribution Network

Low voltage DC distribution networks have flexible access to distributed generations, energy storage devices and DC loads, which have been widely developed. T-source circuit breaker can solve the problems of DC distribution network protection. Compared with Z-source circuit breakers, T-source circuit breaker has the advantages of common ground, zero reflected current and low-pass filtering. However, the traditional bidirectional Z-source and T-source circuit breakers have multiple power semiconductor devices in the steady-state path, which leads to low efficiency of circuit breakers. Therefore, this paper proposes a novel efficient bidirectional T-source circuit breaker, which has only one SCR in the steady-state path. Compared with traditional bidirectional Z-source and T-source circuit breakers, the on-state power loss of the proposed circuit breaker can reduce more than 50%. Finally, the capabilities of the proposed circuit breaker are verified by simulations and experiments.