Optimization desigh of new all-solid-state modular multilevel special high-voltage power supply
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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。Abstract: 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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图 5 容值比与调制比和功率因数角关系
Figure 5. Relationship between capacitance ratio, modulationratio and power factor angle
图 7 容值668 μF上下桥臂子模块电压
Figure 7. Voltage waveforms of upper and lower bridge arm submodules
图 8 模型2容值177 μF上下桥臂子模块电压
Figure 8. Voltage waveforms of upper and lower bridge arm sub-modules in model 2
表 1 仿真参数
Table 1. Simulation parameters
model Udc/kV Uac/kV P/MW f/Hz fc/kHz number of
bridge arm submodulesLarm/mH C/μF transformer
conversion ratioL/μH fH/kHz MMC 12 12 1.2 50 2 4 10 668 − − − I-MMC 4.9 4.9 1.2 50 2 4 10 668/177 1∶1 9 20 
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表 2 实验参数
Table 2. Experimental parameters
Udc/V Uac/V P/kW f/Hz fc/kHz Larm/mH C/μF transformer conversion ratio L/μH fH/kHz 240 240 1.2 50 2 6 110 1:1 4.3 20
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