In the hybrid direct current (DC) circuit breaker with forced current commutation based on full-controllable power electronic devices

the snubber capacitor discharge will affect the mechanical switch opening time in the process of auxiliary commutation circuit opening. When the action of the main circuit breaker is finished

the release of line energy just relies on the lightning arrester making the device damage-prone and affecting its useful life. The arrester investment cost is high and the time of energy dissipating is long. A hybrid DC circuit breaker with forced current commutation is proposed

and its operating principle is analyzed. Finally

the feasibility of this scheme is verified by comparing with typical hybrid DC circuit breakers. Compared with the traditional hybrid DC circuit breaker with forced current commutation based on full-controllable power electronic devices

the proposed scheme realizes the current bidirectional flow with only half the full-controllable power electronics devices. It can block the snubber capacitor discharging road without affecting the mechanical switch opening time

and reduce the line current to zero as soon as possible with a grounding diode circuit. This work is supported by National Basic Research Program of China (973 Program) (No. 2015CB25100).