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| 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 |
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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.
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Received: 07 May 2019
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| Fund:国家重点研发计划高速磁浮交通系统关键技术研究课题资助项目（2016YFB1200602-20） |
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2020, Vol. 35 
