基于混合式开关的超导磁体失超保护系统仿真研究

Simulation of quench protection system for superconducting coils based on hybrid switch

设计了一种基于混合式开关的新型失超保护电路。该电路采用二极管桥与IGBT组合实现电流双向流动,减少了开关数量需求,提高了可靠性;通过调节电路中能耗电阻值实现电流快速下降,提高了耗能速度,能更好完成超导磁体保护要求。采用等效电路的方式对失超保护过程中的多级换流和移能过程进行了分析,给出了保护动作逻辑和能耗电阻的阻值调节策略,并通过电路仿真进行了技术验证。

In this paper,a new quench protection circuit based on hybrid switch is designed.The combination of diode bridge and IGBT is used to realize the bidirectional flow of current,which reduces the number of switches and improves the reliability.By adjusting the resistance of energy consumption resistance,the current decreases rapidly and the energy consumption speed is improved,which can better complete the protection requirements of superconducting magnets.The multi-level commutation and energy transfer process in the quench protection process are analyzed in detail by using the equivalent circuit method.The protection action logic and the resistance adjustment strategy of the energy consumption resistance are given,and the technical verification is carried out by circuit simulation.