A LCL converter for tokamak

Thyristor-based AC/DC converters are presently selected as the tokamak Coil Power Supply System (CPSS), which has simple control and moderate cost but a large amount of reactive power is predicted, such as ITER which requires 3×250 Mvar Reactive Power Compensation system to be installed. Further, the thyristor-based converter may be subjected to short-circuit-fault occurring in its AC or DC side, where its complex protection system is required to be implemented. A LCL transformer for AC/DC converters which can be applied in tokamak CPSS, such as ITER-like CFETR. The AC/DC converter is composed of insulated-gate bipolar transistor (IGBT). Compared with existing thyristor-based AC/DC converters in tokamak CPSS, fault current of the converters with LCL transformer will be close to or below the rated value in the short circuit fault conditions occurring in AC or DC sides. Thus, the complex short circuit protection device can be saved. At the same time, as the IGBT-based AC/DC converter is controlled by PWM, the reactive power can be absorbed by the grid.