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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 |
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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.
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Received: 21 July 2016
Published: 31 January 2018
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Fund:国家自然科学基金青年基金资助项目(51407101) |
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