A New Simple-Structured Thyristor Hybrid DC Circuit Breaker

The wide utilization of DC system has made a DC circuit breaker become indispensable in order to limit or block fault current. HDCCB (Hybrid DC Circuit Breaker) has been studied and developed which combines good features of a mechanical circuit breaker and a solid-state circuit breaker. This paper propose a new simple-structured thyristor hybrid DC circuit breaker. The proposed thyristor HDCCB making use of an inverse current injecting method has the natural charging and discharging features of the commutation capacitor, and consequently blocking the fault current. Furthermore, it can rapidly perform the re-closing and re-breaking of operating duty in addition to the interruption operation of fault currents. A prototype of proposed hybrid DC circuit breaker was designed and fabricated, and its operating features were proven through simulation results and experimental ones.