����IGBT��SUNISTŷķ����Դϵͳ

为充分利用SUNIST球形托卡马克欧姆场的双向磁通,延长等离子体电流平顶时间,对欧姆场的电源系统进行了改造。提出了一种基于多个IGBT并联大电流低频开关的H桥双向放电电路,研发了该双向放电电路的核心元件——3kV/10kA级的IGBT并联大电流开关。对单相电容准恒流充电电路与三相桥式电容换流充电回路进行了研究,合理地确定了双向放电主回路中两组储能电容器C1和C2的充电系统。经过安装、调试以及初步试验,在欧姆场线圈中得到了从正10kA到负6kA的双向放电电流,等离子体电流波形也有明显改善。

The ohmic field power supply system of SUNIST based on IGBT

The double swing fluxes of the ohmic field must be utilized in order to extend the flat top of plasma current in the SUNIST spherical tokamak.This requires an upgrade of the power system of the ohmic field.An H-bridge bidirectional discharge circuit is introduced,which is based on four high-current low-frequency switches composed of multiple parallel IGBTs.The key components of the circuit,3kV/10kA class IGBT switches has been developed.In addition,both the single-phase and three-phase quasi-constant current charging circuit for the energy storage capacitor banks of the upgraded power supply are investigated.After the upgrade,the double swing current,e.g.,+10kA to -6kA,in the ohmic field coils was obtained.The waveforms of plasma current were also improved obviously.