A Generalized Multilevel Inverter Based on T-Type Switched Capacitor Module with Reduced Devices release_lp4zv3iqwvemnoj6g3guap5l2m

by Yaoqiang WANG, Yisen Yuan, Gen Li, Tianjin Chen, Kewen Wang, Jun Liang

Published in Energies by MDPI AG.

2020   Volume 13, Issue 17, p4406

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.
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