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Single-source three-phase switched-capacitor-based MLI

Jena Kasinath, Gupta Krishna Kumar, Bhatnagar Pallavee, Jain Sanjay K., Stala Robert, Waradzyn Zbigniew, Piróg Stanisław, Penczek Adam, Mondzik Andrzej, Skała Aleksander

Power Electronics and Drives

2022

Vol. 7 (42)

197--209

This article proposes a novel three-phase inverter based on the concept of switched capacitors (SCs), which uses a single DC source. A three-phase, seven-level line-to-line output voltage waveform is synthesised by the proposed topology, which includes eight switches, two capacitors, and one diode per phase leg. The proposed topology offers advantages in terms of inherent voltage gain, lower voltage stresses on power switches, and a reduced number of switching components. Additionally, the switched capacitors are self-balanced, thereby eliminating the need for a separate balancing circuit. The proposed structure and its operating principle, the self-balancing mechanism of the capacitors, and the control strategy are all thoroughly explained in the article. The proposed topology has also been compared with some recent SC topologies. Lastly, the proposed topology has been shown to be feasible through simulation and experimentation.