新型全固态模块化多电平特种高压电源优化设计  

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

作　　者：李玉山[1] 钱伟刚 滕甲训 孙孝峰[3] Li Yushan;Qian Weigang;Teng Jiaxun;Sun Xiaofeng(Qinhuangdao Vocational and Technical College,Qinhuangdao 066100,China;Qinhuangdao Yanqin Nano Technology Co.,Ltd,Qinhuangdao 066010,China;Key Laboratory of Power Electronics for Energy Conservation and Motor Drive of Hebei Province,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]秦皇岛职业技术学院,河北秦皇岛066100 [2]秦皇岛市燕秦纳米科技有限公司,河北秦皇岛066010 [3]燕山大学电力电子节能与传动控制河北省重点实验室,河北秦皇岛066004

出　　处：《强激光与粒子束》2024年第2期42-49,共8页High Power Laser and Particle Beams

基　　金：河北省自然科学基金重点项目(E2021203162);河北省重点研发计划项目(19214405D)。

摘　　要：模块化多电平换流器(MMC)已成为新型全固态特种高压电源的有效解决方案,对其进行轻量化设计以节约设备空间成本成为当前研究热点。MMC中限制功率密度提升的首要因素为子模块大尺寸电容,为降低MMC对子模块容值的需求,提高系统功率密度,提出一种改进型MMC(I-MMC)拓扑。应用隔离型开关电容变换器,实现上下桥臂一对子模块高频链互联。研究中相单元内上、下桥臂子模块对并联的高频链两侧采用同步控制,使子模块电容之间呈现开关电容特性,实现波动功率在电容之间的自由传递,进而消除相位相反的基频与3倍频波动分量。结合MMC运行调制比和功率因数分析基频与3倍频波动分量消除后子模块电容取值,完成模块化设计。所提方案可将子模块电容减小至常规MMC的1/4。仿真与实验结果验证了所提拓扑方案的正确性与有效性。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.

关 键 词：模块化多电平变换器 波动抑制 高频链互联 开关电容 

分 类 号：TK513.5[动力工程及工程热物理—热能工程]