Optimal Design of a Novel High-Power Thyristor-based DC Circuit Breaker

Due to dc microgrid nature, dc fault current has no zero-crossing current and could increase up to a thousand amps. Because of that, a dc circuit breaker (DCCB) with the ultra-fast response and high efficiency is required. Regarding this issue, this paper presents a novel thyristor-based DCCB. Then the optimal values of the proposed DCCB components are obtained by cost-power loss multi-objective optimization method. Finally, to keep the maximum temperature of the thyristor below the maximum allowed value, an optimum forced-air microchannel that has high reliability, low cost, and high efficiency is proposed for the proposed thyristor-based DCCB.