| As one of the key parts of the auxiliary heating system, the high voltage power supply(HVPS) determines the efficiency and the performance of the auxiliary heating system directly. In order to absorb the international advanced technology and fill research gap of the inverter type DC HVPS in our China, this paper did some research on the technology of inverter type DC HVPS according to the reference scheme of ITER N-NBI accelerator grid power supply(AGPS) at MV level.Firstly, this paper analysised and compared the schemes of the inverter type DC HVPS used in fusion device all over the world. The schemes of the input rectifier, the isolated dc boost converter and the isolated boost transformer were mainly discussed. Then, the single stage inverter type DC HVPS scheme of the ITER N-NBI AGPS was studied, mainly focus on the analysis of the isolated three phase three level(TPTL) dc boost converter circuit, which is the core part of the inverter type HVPS. The working process of the six different model of the circuit is analysed and the output characteristic of the circuit is got. Finally, a combined control strategy is proposed. By controlling the dc-link voltage and output voltage simultaneously, the control strategy can ensure the output voltage accuracy while limit the output voltage ripple as low as possible.Under the guidance of the theory analysis in this paper, a simulation model of singl stage inverter type HVPS of 200 kV/60 A has been built in Simulink and a prototype of singl stage inverter type HVPS of 400 V/6A also has been built. The circuit analysis and the propsed control stratrgy are demonstrated by simulation and prototype experiments. The simulation and experimental results showed that the theoretical analysis is correct, and the proposed control strategy has a good control effect. Research results in this paper can provide an important reference for the design and development of HVPS used in ITER and other future fusion device. |
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