Research on Topology of Medium Voltage Hybrid DC Circuit Breaker Based on IGCT

Abstract

As the essential protection component in DC distribution system, medium voltage DC circuit breaker that needs to have the characteristics of breaking DC fault current quickly and reliably is the guarantee of the system safe operation. In this paper, taking advantage of IGCT's advantages of low on-state loss, fast turn-off speed and high reliability, a topology of medium voltage hybrid DC circuit breaker with high breaking current, fast breaking speed and high reliability is proposed, which combines the quick breaking performance of high-speed switch. The optimal parameters of the topology scheme are determined by studying the influence of arc voltage, the charging voltage of capacitor, capacitance and transfer reactor on the breaking characteristics and current transfer characteristics of hybrid circuit breaker. The circuit breaker proposed in this paper can realize the current breaking from 10 A to 20 kA under the conditions, the clearing time is less than 2 ms. The research results show that the topology of Hybrid DC circuit breaker proposed in this paper has good applicability and feasibility.