Abstract
In order to reduce the breaking pressure of solid-state circuit breaker when removing DC fault and improve the ability of restraining fault current, a current limiting solid-state circuit breaker topology is proposed. Compared with the traditional current limiting solid-state circuit breaker, this structure has certain advantages in cutting off the fault line speed and restraining the fault current. It is suitable for DC microgrid with fast development speed and high amplitude of fault current. In this paper, the blocking process of the topology is analyzed theoretically, and the design method of relevant parameters and energy consumption calculation are given. In order to verify the feasibility of the scheme, a simulation model is built in saber software. The simulation results show that the proposed structure can suppress the rise rate of fault current by 53.9%, and shows excellent performance in fault isolation speed.
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