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Cascadable Enhanced Quasi‐Z‐Source Inverter with Reduced Current Stress

Ahmad Mahdave, Mohammad Monfared Orcid Logo, Ali Nikbahar, Wahid Eskandary

IET Power Electronics, Volume: 18, Issue: 1

Swansea University Author: Mohammad Monfared Orcid Logo

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DOI (Published version): 10.1049/pel2.70073

Abstract

In magnetically coupled impedance source (MCIS) inverters, the turn ratio of the coupled inductor offers design flexibility. The leakage inductance, however, poses additional challenges, mainly voltage spikes. This paper proposes a novel quasi-Z-source inverter (qZSI) with the coupled inductor'...

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Published in: IET Power Electronics
ISSN: 1755-4535 1755-4543
Published: Institution of Engineering and Technology (IET) 2025
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa69770
Abstract: In magnetically coupled impedance source (MCIS) inverters, the turn ratio of the coupled inductor offers design flexibility. The leakage inductance, however, poses additional challenges, mainly voltage spikes. This paper proposes a novel quasi-Z-source inverter (qZSI) with the coupled inductor's voltages effectively clamped in each operating state without any additional snubber, reducing the stresses on the semiconductors and providing a smooth DC-link voltage. It also features significantly lower peak shoot-through (ST) current compared to other high-gain impedance source networks, resulting in enhanced efficiency and lower rating of semiconductors. Furthermore, the input current is continuous and there is a common ground between the input source and the H-bridge, which brings practical advantages. Theoretical analysis and comparison of performance with similar topologies are presented and confirmed through extensive experiments on a 500 W prototype.
Keywords: active-switched; clamped capacitor z-source; high gain; magnetically coupled impedance source network; quasi-z-source inverter
College: Faculty of Science and Engineering
Funders: Swansea University
Issue: 1

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