A Multi-Modulation Waveform Phase-Shift Sinusoidal Pulse Width Modulation Method of QZS-CHI and Its Output Voltage Analysis
Wang Jian1, Zhang Rui1, Liu Yang2, Li Yuan3
1. Sichuan Energy Internet Research Institute Tsinghua University Chengdu 610042 China; 2. Institute of Aeronautics and Engineering Civil Aviation Flight University of China; Guanghan 618307 China; 3. College of Electrical Engineering Sichuan University Chengdu 610065 China
Abstract：Quasi-Z-source cascaded H-bridge inverters (QZS-CHI) have broad application prospects in distributed generation. In the conventional modulation method, the insertion of the shoot-through state doubles the switching frequency, resulting in large switching loss. In this paper, a multi-modulation waveform phase-shifting SPWM method is proposed by inserting the shoot-through state into the switching moment, which can effectively reduce the switching loss. Since the shoot-through duty ratio is constrained by the modulation ratio, the level of the output voltage is affected. The relations of the output voltage level with the modulation ratio, the number of modules and the shoot-through duty ratio are analyzed in this paper. By constructing the simulation model and test prototype of the cascaded 6-module QZS-CHI, the modulation method and the output level analysis under open-loop conditions are verified. The experimental results show that the maximum efficiency of the proposed modulation method can reach 96.64%, which is 1.71% higher than that of the traditional modulation method.
王剑, 张芮, 刘洋, 李媛. 一种QZS-CHI的多调制波移相正弦脉宽调制方法及其输出电压分析[J]. 电工技术学报, 2020, 35(16): 3470-3477.
Wang Jian, Zhang Rui, Liu Yang, Li Yuan. A Multi-Modulation Waveform Phase-Shift Sinusoidal Pulse Width Modulation Method of QZS-CHI and Its Output Voltage Analysis. Transactions of China Electrotechnical Society, 2020, 35(16): 3470-3477.
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2020, Vol. 35 
