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| A Five-Level PWM Rectifier Based on New Modular Multilevel Converter |
| Wang Kui, Zheng Zedong, Li Yongdong |
| State Key Lab of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing 100084 China |
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Abstract Multilevel PWM rectifier is featured with unity power factor, bidirectional power flow and suitable for high voltage high power applications. Modular multilevel converter (MMC) is a highly attractive multilevel converter topology for medium and high voltage applications during recent years for its high modularity, transformer-less feature and possibility to be extended to higher levels. This paper presents a five-level PWM rectifier based on a new MMC topology which needs fewer cells than conventional MMC. Voltage oriented control is used to control the bus voltage and input power factor, and voltage balancing control is realized by selecting proper basic cells operating at different modes according to their instantaneous capacitor voltages and the bridge current direction. The proposed method can be used for any number of basic cells in series and any voltage levels. The validity of the proposed method is verified by experimental results with a three-phase five-level PWM rectifier.
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Received: 20 October 2010
Published: 07 March 2014
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2011, Vol. 26 
