Proposal of Hybrid DC Circuit Breaker Applying Reverse Current Injection Topology

In order to respond with the power consumption caused by the spread of eco-friendly vehicles and the expansion of data centers, it is necessary to increase the generation of new and renewable energy and provide stable power. In order that, it is necessary to configure a multi-terminal DC grid to effectively manage the AC/DC hybrid grid operation and the connection between the DC systems. DC circuit breaker that can be separated from the accident system is needed to minimize the impact at the fault and the stable operation of the multi-terminal DC grid. In this paper, we propose a hybrid DC circuit breaker that performs the blocking operation by creating a current zero crossing by injecting a reverse current. The current formula is explained through the order and analysis of the topology blocking operation. And the performance of the topology was verified by modeling and simulation the reverse current injection topology through PSCAD/EMTDC.