中国聚变工程实验堆大功率混合直流开关概念设计

Conceptual design of high power hybrid DC switch for China Fusion Engineering Experiment Reactor

中国聚变工程实验堆中的超导线圈失超保护开关要求的额定参数达到了10kV/±100kA,针对该运行参数提出了一种混合式直流开关。承担稳态通流的机械开关采用了三级触头结构,可以降低固态开关的通流时间。双向固态开关的阀串采用二极管桥与IGBT组合的形式,结温分析证明可以提高器件的流通电流限制,并对该基本单元拓扑进行了大电流开断实验,验证了该设计的可行性。

The rated parameters of quench protection switch for China Fusion Engineering Experiment Reactor(CFETR) are up to 10 kV/±100 kA. In this paper, a hybrid DC switch is proposed to meet the requirements. The hybrid switch contains an innovative mechanical bypass switch with three levels contacts for conducting the continuous current, which can reduce the on-state time of solid-state switch. The bi-directional solid-state switch is composed of diode bridge and IGBTs. The analysis of junction temperature proves that the maximum allowable current of IGBTs can be improved. In addition, high current interruption experiments of the basic unit topology were carried out to verify the feasibility of the design.