Multi-purpose Optimal Control Strategy of a Five-Level Active Neutral-Point Clamped Inverter Based on Zero-Sequence Voltage Injection
Wang Kui1 , Zheng Zedong1 , Li Yongdong1,2
1. State Key Laboratory of Control and Simulation of Power System and Generation Equipments Dept. of Electrical Engineering, Tsinghua University Beijing 100084 China; 2. Xinjiang University Urumqi 830046 China
Abstract：A multi-purpose optimal control strategy of a five-level active neutral-point clamped (ANPC) inverter was studied in this paper, including the neutral-point (NP) potential balancing control, switching frequency optimization and common-mode voltage reduction. A NP potential balancing algorithm based on zero-sequence voltage injection was presented. By calculating the NP currents of all key zero-sequence voltages, the most appropriated zero-sequence voltage was selected to generate the demanded NP current, which can make the NP voltage ripple lowest. In addition, by further limiting the region of injected key zero-sequence voltages, the series connected IGBTs can operate at fundamental frequency and the amplitude of common-mode voltage can be reduced to a quarter of the DC-link voltage. Experimental results are presented to verify the validity of this control strategy.
王奎, 郑泽东, 李永东. 基于零序电压注入的五电平有源中点钳位型逆变器多目标优化控制策略[J]. 电工技术学报, 2014, 29(6): 129-135.
Wang Kui , Zheng Zedong , Li Yongdong. Multi-purpose Optimal Control Strategy of a Five-Level Active Neutral-Point Clamped Inverter Based on Zero-Sequence Voltage Injection. Transactions of China Electrotechnical Society, 2014, 29(6): 129-135.
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2014, Vol. 29 
