Research on SVPWM and DPWM Strategies Suitable for High Power Three-Level Neutral Point Clamped Rectifier
Gao Zhan1,2, Li Yaohua1,2, Ge Qiongxuan1,2, Zhao Lu1,2, Zhang Bo1,2
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 high power three-level neutral point clamped (NPC) rectifier should reduce the switching frequency as much as possible while satisfying the harmonic current limit of the grid side, the neutral-point voltage balancing of the DC side and avoiding the phase voltage two-level jump (TLJ). Based on the above requirements, this paper firstly analyzes the basic principles of space vector pulse width modulation (SVPWM) and discontinuous PWM (DPWM), and then introduces four SVPWM switching sequences and eight DPWM switching sequences and compares their respective phase voltage waveforms. Aiming at the defects of TLJ and high switching frequency of traditional SVPWM, two improved SVPWM switching sequences are designed. And to solve the TLJ of DPWM, two improved DPWM switching sequences are proposed. On this basis, this paper studies SVPWM and DPWM from the aspects of TLJ, switching frequency, neutral-point voltage self-balancing ability, total harmonic distortion (THD) and harmonic current content, and summarizes three SVPWM switching sequences suitable for high power three-level NPC rectifier. Finally, a three-level NPC converter prototype is established, and the effectiveness of the designed improved switching sequences are verified by experiments.
高瞻, 李耀华, 葛琼璇, 赵鲁, 张波. 适用于大功率三电平中点钳位整流器的SVPWM和DPWM策略研究[J]. 电工技术学报, 2020, 35(23): 4864-4876.
Gao Zhan, Li Yaohua, Ge Qiongxuan, Zhao Lu, Zhang Bo. Research on SVPWM and DPWM Strategies Suitable for High Power Three-Level Neutral Point Clamped Rectifier. Transactions of China Electrotechnical Society, 2020, 35(23): 4864-4876.
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2020, Vol. 35 
