Tokamak vertical stability coil power supply based on modular multilevel converter
Tokamak is a nuclear fusion reactor that involves high-current power supply systems. Vertical stabilization is required to achieve desired plasma current and elongation in the tokamak. Due to the high current and fast current dynamic response requirements, circuit topology of power supply for vertical stabilization coil is important. In this paper, a full-bridge single-phase modular multilevel converter (MMC) is proposed. Circuit design, voltage balancing strategy and circulating current suppression control method are presented. The proposed topology and strategies are verified in simulations with MATLAB/Simulink.