DC Current Flow Controller With Fault Current Limiting and Interrupting Capabilities

Conventionally, the current flow control and DC fault protection issues of HVDC grids are supposed to be solved by controller (CFC) circuit breaker (DCCB) separately, which may result in a high capital cost. This paper proposes CFC topology with limiting interrupting capabilities. The operating principle presented theoretical analysis. strategies under normal conditions described. In order reduce use IGBTs, an H-bridge inter-line capability is further proposed based on CFC. CFCs tested PSCAD/EMTDC. Simulation results show that two can effectively lines during operation limit interrupt currents.