A Comprehensive Review on Common-Mode Voltage of Three-Phase Quasi-Z Source Inverters for Photovoltaic Applications

Sherif M. Dabour (), Noha El-hendawy, Ahmed A. Aboushady, Mohamed Emad Farrag and Essam M. Rashad
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Sherif M. Dabour: Department of Electrical Power and Machines Engineering, Tanta University, Tanta 31733, Egypt
Noha El-hendawy: Department of Electrical Power and Machines Engineering, Tanta University, Tanta 31733, Egypt
Ahmed A. Aboushady: SMART Technology Centre, School of Computing, Engineering, and Built Environment, Glasgow Caledonian University, Glasgow G4 0BA, UK
Mohamed Emad Farrag: SMART Technology Centre, School of Computing, Engineering, and Built Environment, Glasgow Caledonian University, Glasgow G4 0BA, UK
Essam M. Rashad: Department of Electrical Power and Machines Engineering, Tanta University, Tanta 31733, Egypt

Energies, 2022, vol. 16, issue 1, 1-28

Abstract: Inverters with Quasi-Z-Source Networks (QZSN) provide DC-DC boosting and DC-AC conversion in a single stage. It offers reduced cost, complexity, and volume compared with the classical two-stage conversion system, which is composed of a boost converter followed by a Voltage-Source-Inverter (VSI). Further, QZSI provides superior conversion characteristics for single-stage grid-connected photovoltaic transformerless systems. However, the absence of galvanic isolation in these systems makes it possible to allow leakage current through these systems’ parasitic capacitances due to the high-frequency Common-Mode Voltage (CMV) generated by the Pulse Width Modulation (PWM) nature of the inverter output voltages. As a result of this current, critical safety issues may arise with PV systems. Many PWM techniques have been presented in recent years for QZSIs. This paper is intended to provide a comprehensive analysis and review study of the characteristics of most of these PWM techniques in terms of CMV and leakage currents. In this study, closed-form equations have been derived to determine the effective CMV and leakage current analyses for all modulation techniques. Analytical and simulation approaches are used to identify schemes with the lowest CMV and current leakage effects. Moreover, the experimental setup is presented by applying the Simple-Boost Modified Space Vector Modulation (SB-MSVM) technique.

Keywords: Quasi-Z-source network; PV inverters; common-mode voltage; leakage current analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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