An Interline Multiport DC Circuit Breaker with Power Flow Controller

Currently, the high-voltage multi-terminal DC (MTDC) grids face two major challenges. First, fast rise rate and lack of zero-crossing point in DC-side fault currents render AC circuit breakers inoperable. Second, DC line currents are passively determined by terminal DC voltages and line resistances, which inherently limits the capability of changing individual line currents for essential grid services such as power flow management and overloading prevention. To address these two limitations, DC circuit breakers (DCCBs) and DC power flow controllers (DCPFCs) have been developed. The conventional DCCBs are two-port devices installed in series with