A new z-source dc circuit breaker

A novel type of circuit breaker is introduced for application in medium-voltage dc power systems. The breaker utilizes a z-source L-C circuit in order to automatically commutate a main-path SCR during a fault. Compared to existing dc circuit breakers, the z-source breaker features faster turn-off, simpler control, and the source does not experience the fault current. The operation and analysis of the new breaker is presented. Component sizing is carried out for three medium-voltage power levels. The new concept is verified with detailed simulation. Incorporation of the new breaker within a drive system is also explored.