Capacitor Converter DC Circuit Breaker with Current Limiting Function

DC circuit breaker is the core equipment for the safe and stable operation of DC transmission system. In order to design a DC circuit breaker with low cost and current limiting function, a capacitor converter DC circuit breaker with current limiting function is proposed in this paper. The topology uses capacitance to replace IGBT to realize the switching of circuit state, which greatly reduces the number of IGBT, moreover, through the use of current limiting branch, the peak value and rate of current are restrained, the requirements of energy absorption capacity of lightning arrester are reduced, the fault cut-off time is shortened, and the cost and technical difficulty are greatly reduced. In this paper, the working principle of the extracted topology is studied and analyzed in stages, and then the parameters are designed. Finally, the system simulation model is built by using PSCAD software to verify the simulation model. Compared with the typical circuit breaker design scheme, the rationality and superiority of the proposed scheme are proved.