High Power Laser and Particle Beams, Volume. 36, Issue 2, 025007(2024)

Optimization desigh of new all-solid-state modular multilevel special high-voltage power supply

Yushan Li1, Weigang Qian2, Jiaxun Teng3、*, and Xiaofeng Sun3、*
Author Affiliations
  • 1Qinhuangdao Vocational and Technical College, Qinhuangdao 066100, China
  • 2Qinhuangdao Yanqin Nano Technology Co., Ltd, Qinhuangdao 066010, China
  • 3Key Laboratory of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Yanshan University, Qinhuangdao 066004, China
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    Modular multilevel converter (MMC) has become an effective solution for new all-solid-state special high-voltage power supply, and its lightweight design to save equipment space cost has become a research hotspot. The primary factor limiting power density in MMC is the large size capacitance of submodule (SM), and to reduce the demand for the capacitance of the sub-module in modular multilevel converter, and increase system power density, an improved MMC(I-MMC) topology is proposed. Using isolated switched capacitor converters, a pair of SMs of the upper and lower arms are interconnected through a high frequency link. In the research, synchronous control was adopted on both sides of the high-frequency chain connecting the pair of SMs in the phase unit to make the SM capacitors present the characteristics of switched capacitors, realize free transfer of fluctuating power between the capacitors, and eliminate the fluctuation components of the oppostite phased fundamental frequency and triple frequency. Combining MMC operation modulation ratio and power factor, we analyzed the value of the SM capacitor after the fundamental frequency and triple frequency fluctuation components had been eliminated, and completed the modular design. This solution can reduce the sub-module capacitance to 1/4 of the conventional MMC's capacitance. Simulation and experimental results verify the correctness and the validity of the proposed topology scheme.

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    Yushan Li, Weigang Qian, Jiaxun Teng, Xiaofeng Sun. Optimization desigh of new all-solid-state modular multilevel special high-voltage power supply[J]. High Power Laser and Particle Beams, 2024, 36(2): 025007

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    Paper Information

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    Received: Sep. 18, 2023

    Accepted: Oct. 18, 2023

    Published Online: Mar. 21, 2024

    The Author Email: Jiaxun Teng (tengjiaxun@qq.com), Xiaofeng Sun (sxf@ysu.edu.cn)

    DOI:10.11884/HPLPB202436.230322

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