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A single-input extended multilevel inverter based on switched-capacitor with reduced number of devices

Wang, Yaoqiang, Wang, Changlong, Wang, Yi, Wang, Kewen and Liang, Jun 2022. A single-input extended multilevel inverter based on switched-capacitor with reduced number of devices. International Journal of Electrical Power & Energy Systems 138 , 107872. 10.1016/j.ijepes.2021.107872
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Abstract

The existing multilevel inverter (MLI) has problems such as a large number of devices, a complex structure, and a large voltage stress of the semiconductor. These shortcomings are not conducive to the modularization, high efficiency and miniaturization of the inverter. Therefore, a topology of extended switched capacitor multilevel inverter utilizing single power supply is proposed. In which, the capacitor is used as a virtual power supply, through the switching control strategy, capacitors and the power supply are reasonably combined, then a multilevel output voltage can be acquired. The proposed topology mainly has the following advantages. Firstly, it can be expanded to further increase the number of output levels. Secondly, the structure of the basic switched capacitor circuit used in the topology is simple, which can reduce the number of devices when the output is the same. Thirdly, the terminal H-bridge for output voltage polarity conversion can be eliminated in the proposed topology, which is beneficial to reduce the total standing voltage and peak inverse voltage. Therefore, an opportunity for the application of the inverter in medium and high voltage is provided. Additionally, the inherent capacitor voltage self-balancing capability of the proposed topology can eliminate the additional balancing control algorithms, therefore, the modulation strategy is simplified. Finally, the correctness and effectiveness of the topology are verified by the extensive simulation and experimental results carried out on the 13-level inverter.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 0142-0615
Date of First Compliant Deposit: 24 January 2022
Date of Acceptance: 13 December 2021
Last Modified: 25 Jan 2022 03:48
URI: https://orca.cardiff.ac.uk/id/eprint/146573

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