The Experimental Analysis on Quasi-Z-Source Cascade Multilevel Inverter-Based Grid-Tie Single-Phase Photovoltaic Power Syste

Abstract

An effective control method, including system-level control and pulsewidth modulation for quasi-Zsource cascade multilevel inverter (qZS-CMI) based grid-tie photovoltaic (PV) power system is proposed.
The system-level control achieves the grid-tie current injection, independent maximum power point
tracking (MPPT) for separate PV panels, and dc-link voltage balance for all quasi-Z-source H-bridge
inverter (qZS-HBI) modules. The first solution comprises a full-SiC two-level QZS inverter, while the
second design was built based on a three-level neutral-point-clamped QZS inverter with Silicon based
Metal–Oxide–Semiconductor Field-Effect Transistors (Si MOSFETs). Several criteria were taken into
consideration: the size of passive elements, thermal design and size of heatsinks, voltage stress across
semiconductors, and efficiency investigation. The Photovoltaic (PV)-string rated at 1.8 kW power was
selected as a case study system. The advantages and drawbacks of both solutions are presented along with
conclusions.