Comparison of common-mode voltage in three-phase quasi-Z-source inverters using different shoot-through implementation methods

N Noroozi,M Yaghoubi,M R Zolghadri

doi:10.1109/cpe.2018.8372566

Comparison of common-mode voltage in three-phase quasi-Z-source inverters using different shoot-through implementation methods

N Noroozi, M Yaghoubi + Show 1 more

https://doi.org/10.1109/cpe.2018.8372566

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Publication Date: Apr 1, 2018

Citations: 10

Affiliation: Sharif University of Technology

#Common-mode Voltage #Shoot-through + Show 8 more

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Abstract

In Z-source family inverters, shoot-through (ST) states are applied as a part of passive state in each switching cycle. The distribution of ST intervals along a switching period affects the system parameters as total harmonic distortion (THD), switching loss and common-mode voltage (CMV). In this paper, ST methods in a three-phase quasi-Z-source inverter (q-ZSI) are compared due to the CMV level. High-frequency harmonics of CMV cause leakage current flow in a transformerless grid-connected photovoltaic (PV) system. Through the comparison of the ST methods, the method with minimum CMV is identified. The experimental results are presented for a low voltage q-ZSI prototype.

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