Design of DC Magnet Power Supply System for ITER Static Magnetic Field Test Facility

International Thermonuclear Experimental Reactor (ITER) static magnetic field (SMF) test facility requires a dc power supply with low voltage, high current, and low harmonics under high power density. Due to the limitation of switching loss, there is a contradiction between the output current capability and the output ripple. Large output current usually leads to low switching frequency, and low switching frequency will generate a large number of harmonics. To solve the problems, a topology based on the interleaving parallel buck converter is used and tested in this article. Moreover, the topology is realized with only a small number of switching metal–oxide–semiconductor field-effect transistors (MOSFETs). This article introduces the system design scheme and control method in detail. The analysis of harmonic and simulation is carried out. The validity of the proposed scheme and control strategy was confirmed by experiments, and the power supply system can supply a large current of 12.23 kA and has the ability of low ripple.