The Topologies and Control of Hybrid-Clamped Four-Level and Five-Level Inverters
Wang Kui, Zheng Zedong, Xu Lie, Li Yongdong
State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China
Abstract：A novel hybrid-clamped four-level inverter topology and its derived five-level topology are presented in this paper. The proposed topologies can improve the voltage levels, reduce the number of devices in the diode-clamped and flying capacitor multilevel converters, and avoid the series connection of switches in the five-level active-neutral-point-clamped converter. To achieve the voltage balancing of DC-link capacitors and flying capacitors, a modified PWM method is proposed. This PWM method can regulate the central DC-link capacitor and flying capacitor voltages by adjusting the duty cycles of PWM signals slightly. The upper and lower DC-link capacitor voltages are balanced by zero-sequence voltage injection. An experimental prototype is built up, and the experimental results verify this topology.
王奎, 郑泽东, 许烈, 李永东. 混合钳位型四电平和五电平逆变器拓扑结构和控制策略[J]. 电工技术学报, 2018, 33(2): 353-360.
Wang Kui, Zheng Zedong, Xu Lie, Li Yongdong. The Topologies and Control of Hybrid-Clamped Four-Level and Five-Level Inverters. Transactions of China Electrotechnical Society, 2018, 33(2): 353-360.
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