A Generalized Multilevel Inverter Based on T-Type Switched Capacitor Module with Reduced Devices

Yaoqiang Wang, Yisen Yuan, Gen Li, Tianjin Chen, Kewen Wang and Jun Liang
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Yaoqiang Wang: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Yisen Yuan: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Gen Li: School of Engineering, Cardiff University, Cardiff CF24 3AA, UK
Tianjin Chen: XJ Power Co., Ltd., Xuchang 461000, China
Kewen Wang: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Jun Liang: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China

Energies, 2020, vol. 13, issue 17, 1-20

Abstract: Conventional multilevel inverters have problems in terms of their complicated expansion and large number of devices. This paper proposes a modular expanded multilevel inverter, which can effectively simplify the expansion and reduce the number of devices. The proposed inverter can ensure the voltage balancing of the voltage-dividing capacitors. The cascading of the T-type switched capacitor module and the step-by-step charging method of the switched capacitors enable the inverter to achieve high output voltage levels and voltage gain. In addition, the inversion can be achieved without the H-bridge, which greatly reduces the total standing voltage of the switches. The nine-level inverter of the proposed topology can be realized with only ten switches, obtaining a voltage gain that is two times larger. The above merits were validated through theoretical analysis and experiments. The proposed inverter has good application prospects in medium- and low-voltage photovoltaic power generation.

Keywords: inverter; multilevel inverter; switched capacitor; module; expansion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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