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A T-type switched-capacitor multilevel inverter with low voltage stress and self-balancing

Wang, Yaoqiang, Yuan, Yisen, Li, Gen, Yuanmao, Ye, Wang, Kewen and Liang, Jun 2021. A T-type switched-capacitor multilevel inverter with low voltage stress and self-balancing. IEEE Transactions on Circuits and Systems I: Regular Papers 68 (5) , pp. 2257-2270. 10.1109/TCSI.2021.3060284

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Abstract

This paper proposes a novel T-type multilevel inverter (MLI) based on the switched-capacitor technique. The proposed inverter not only achieves that the maximum voltage stress of the switches is less than the input voltage but also has a voltage boost capability, which makes it suitable in high voltage applications. It is worth mentioning that the proposed inverter features two topology extension schemes which help it achieve a higher output level and voltage gain. With the merit of low voltage stress and reduced power devices, a seven-level inverter can be achieved using only two capacitors. Moreover, capacitor voltage self-balancing capability can simplify the complexity of the circuit and control. The topology, operating principle, modulation strategy and analysis of the capacitor of the inverter are presented. The superiorities of the proposed inverter are investigated by comparing with recently proposed hybrid MLIs and switched-capacitor MLIs. Finally, a seven-level prototype is constructed to validate the correctness of the theoretical analysis and the feasibility and effectiveness of the proposed inverter.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
ISSN: 1549-8328
Date of First Compliant Deposit: 15 February 2021
Date of Acceptance: 13 February 2021
Last Modified: 08 Oct 2021 18:25
URI: http://orca.cardiff.ac.uk/id/eprint/138565

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