作者:\n\t董鹤楠，李炳坤，孙峰，程绪可，刘一琦\n

Authors:\n\tDONG Henan,LI Bingkun,SUN Feng,CHENG Xuke,LIU Yiqi\n
摘要:\n\t针对目前大多数混合直流断路器不具备限流功能且造价过高的问题，提出一种低成本限流型混合直流断路器。当故障发生后，并联在两侧的高速机械开关 (ultra-fast disconnector，UFD)断开，电容C充电完成后断开两侧支路，电路由并联转为串联。随后，短路电流降低为单个支路电流，电感串联可限制电流的增长速度。IGBT阀组通过二极管桥式电路连接来实现双线关断，可减少绝缘栅双极晶体管(IGBT)数量。在相同参数下进行仿真计算，和传统的断路器相比IGBT使用数量降低83%。最后通过PSCAD/EMTDC和实验平台验证此拓扑的有效性。\n

Abstract:\n\tTo solve the problem that most of the current hybrid DC circuit breakers do not have the current limiting function and the cost is too high, a low-cost current limiting hybrid DC circuit breaker is proposed.When the fault occurs, the ultra-fast disconnector(UFD) connected in parallel on both sides is disconnected, and the branches on both sides are disconnected after the capacitor C is charged, and the circuit is converted from parallel to series.Subsequently, the shortcircuit current is reduced to a single branch current, and the inductance in series limits the rate of increase of the current.The IGBT valve group is connected by a diode bridge circuit to achieve two-wire turn-off, which can reduce the number of insulated gate bipolar transistors (IGBTs). The simulation calculation is carried out under the same parameters, and the number of IGBTs used is reduced by 83% compared with the traditional circuit breaker.Finally, the validity of this topology is verified by PSCAD/EMTDC and experimental platform.\n


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