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Open Access

Generalized Switched-Capacitor Step-up Multilevel Inverter Employing Single DC Source

Yaoqiang Wang, Kaige Wang, Gen Li ( ), Fengjiang Wu, Kewen Wang, Jun Liang
School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Henan Engineering Research Center of Power Electronics and Energy Systems, Zhengzhou 450001, China
Zhengzhou University, Zhengzhou 450001, China
Zhoukou Power Supply Company, State Grid Henan Electric Power Co., Ltd., Zhoukou 466000, China
Zhengzhou University, Zhengzhou 450001, China
Cardiff University, Cardiff CF24 3AA, U.K.
Department of Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China
School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Zhengzhou University, Zhengzhou 450001, China
Cardiff University, Cardiff CF24 3AA, U.K.
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Abstract

In this paper, a new generalized step-up multilevel DC-AC converter is proposed, which is suitable for applications with low-voltage input sources, such as photovoltaic power generation and electric vehicles. This inverter can achieve a high voltage gain by controlling the series-parallel conversion of the DC power supply and capacitors. Only one DC voltage source and a few power devices are employed. The maximum output voltage and the number of output levels can be further increased through the switched-capacitor unit’s extension and the submodule cascaded extension. Moreover, the capacitor voltages are self-balanced without complicated voltage control circuits. The complementary operating mechanism between each pair of switches simplifies the modulation algorithm. The inductive-load ability is fully taken into account in the proposed inverter. Additionally, a remarkable characteristic of the inverter is that the charging and discharging states among different capacitors are synchronous, which reduces the voltage ripple of the front-end capacitors. The circuit structure, the working principle, the modulation strategy, the capacitors and losses analysis are presented in detail. Afterwards, the advantages of the proposed inverter are analyzed by comparing with other recently proposed inverters. Finally, the steady-state and dynamic performance of the proposed inverter is verified and validated by simulation and experiment.

Keywords

Modulation strategymultilevel invertersingle DC sourceswitched capacitorvoltage self-balancing

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CSEE Journal of Power and Energy Systems
Volume 8 Issue 2,
March 2022
Pages 439-451
DOI: 10.17775/CSEEJPES.2020.06280
Cite this article:
Wang Y, Wang K, Li G, et al. Generalized Switched-Capacitor Step-up Multilevel Inverter Employing Single DC Source. CSEE Journal of Power and Energy Systems, 2022, 8(2): 439-451. https://doi.org/10.17775/CSEEJPES.2020.06280

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Received: 24 November 2020
Revised: 07 February 2021
Accepted: 10 March 2021
Published: 10 September 2021
© 2020 CSEE
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