A Carrier-Based SVPWM Begins with the Zero Voltage Vector for Three-Level Neutral Point Clamped Converter
Gao Zhan1,2, Ge Qiongxuan1, Li Yaohua1,2, Zhao Lu1, Zhang Bo1
1. Key Laboratory of Power Electronics and Electric Drive Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China; 2. University of Chinese Academy of Sciences Beijing 100049 China
Abstract：The space vector PWM begins with the zero voltage vector (SVPWM-BWZ) for the three-level converter has the advantages of satisfying the minimum pulse width limitation and generating arbitrarily small line voltage at a low modulation index. It is suitable for start-up and low-speed status of variable frequency speed regulation system, but its implementation is complex. To solve this problem, the basic principle of SVPWM-BWZ is introduced in this paper firstly, then the equivalent relationship between SVPWM-BWZ and carrier-based PWM is analyzed. Accordingly, a carrier-based SVPWM-BWZ (CBSVPWM-BWZ) method and the corresponding neutral point alancing control strategy are proposed. The output phase voltage spectrum and pulse width characteristics of three-level converter and the switching frequency of power devices under CBSVPWM-BWZ are derived. Finally, the effectiveness of the proposed method is verified by simulation and experiments. The results show that the proposed method is completely equivalent to the traditional SVPWM-BWZ strategy. It has better modulation effect at low modulation ratio and does not need to calculate the duration of the space vector, which is more convenient to implement.
高瞻, 葛琼璇, 李耀华, 赵鲁, 张波. 一种基于载波实现的三电平中点钳位变流器零矢量首发SVPWM方法[J]. 电工技术学报, 2020, 35(10): 2194-2205.
Gao Zhan, Ge Qiongxuan, Li Yaohua, Zhao Lu, Zhang Bo. A Carrier-Based SVPWM Begins with the Zero Voltage Vector for Three-Level Neutral Point Clamped Converter. Transactions of China Electrotechnical Society, 2020, 35(10): 2194-2205.
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2020, Vol. 35 
