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

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