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 mediumvoltage power levels. The new concept is verified with detailed simulation. Incorporation of the new breaker within a drive system is also explored.