A new protection scheme for multi-bus DC power systems using an event classification approach

DC microgrid systems with hybrid energy resources are of significant interest in shipboard and spacecraft applications. In such a system, coordinated operation of circuit breakers (CBs) and disconnecting switches (DSs) can rapidly isolate short circuit faults and restore the system very fast. In this paper, we investigate a new protection scheme for a multi-bus DC systems based on an event classification approach. The proposed protection scheme transfers less data when compared with commonly used data-based protection methods and does not require high speed communication and synchronization. The results show that the developed protection scheme is able to identify the type of fault accurately, isolate the faulted area and restore the system very quickly while maintaining continuous power to the loads.