An adaptive current commutation for hybrid DC circuit breaker

• Altering the commutation rate in the DC hybrid circuit breaker can lead in the current being interrupted by the mechanical switch at the first zero crossing . • Controllable current injection facilitates the utilization of mechanical switches with different mediums in the hybrid circuit breaker structure. • Activating the mechanical switch in the zero current range and interrupting the fault current at the initial zero current prevents arc formation. • An arc-free interruption reduces stress on the mechanical switch, hence extending its lifespan. • Controllable current injection can ensure the success of the commutation process. DC circuit breakers (DCCB) play a critical role in DC networks which highly affect the reliability, availability, and resiliency of the system. Owing to dynamic rate of rise of DC short circuit current without any current zeros, DCCB should take more flexible performance. In response to this, this paper proposes a novel design based on the magnetic current diverter (MCD) a long with a control approach for commutation branch of hybrid DCCBs (H-DCCB). In comparison with other efforts, this approach could provide an adaptable current injection system which assures a fast arc-less interruption. Furthermore, this topology removes the large losses, limited reliability, and complexity of temperature control associated with solid state switches based DCCB. The feasibility and applicability of the topology has been verified through experiments and finite element simulations.