Design the Phase Output Bar for Improving Static and Dynamic Current Distribution Among Parallel IGBTs in High Power Rectifier Bridge Arm of the Super-Conducting Tokamak (EAST)

This article used co-simulation with ANASYS, Simplorer, and MATLAB/Simulink to design a phase output bar (POB) for achieving equal static and dynamic current sharing among three parallel insulated-gate bipolar transistors (IGBTs) in a bridge arm of Super-conducting Tokamak (EAST) poloidal field power supply (PFPS). A separated output bar structure is proposed, and the bus structure is modeled parametrically. Q3D was used to extract the POB’s stray inductance to compare and evaluate. The influence on stray inductance and steady-state current distribution of various degrees of separation structures is evaluated and compared. The structure design was optimized to obtain a more uniform stray parameter distribution. Asynchronous Gate Signal Driving Method is introduced to improve dynamic current sharing. Through multi-physical field and circuit co-simulation, the whole module is verified by system-level simulation. The maximum ratio of the three IGBT modules’ imbalanced current (MRIC) is within 5%. The current sharing performance with the designed POB was verified. Finally, a power stack with a dc-link voltage of 1700 V based on three parallel IGBTs was constructed. The co-simulation results indicated the effectiveness of the proposed design for the POB. The bridge arm module has been applied in the EAST polar field power supply PS11 and PS12.