Design and analysis of a novel grid connected high gain quasi z source inverter with different modulation techniques

Abstract

The rapid development of electrical energy consumption and the need for clean and free energy for environmental safety have put renewable energy-based power generation in the spotlight, and it is growing at a rapid rate throughout the world. Solar photovoltaic (PV) systems are becoming more popular among grid-connected renewable energy technologies. Solar PV has several advantages, including long life, ease of installation, rooftop applications, free and unlimited energy, clean energy generation, noiseless operation, lack of moving parts, and low maintenance. Grid-connected solar inverters eliminate the need for large battery banks, saving both space and cost. PV modules, on the other hand, have poor energy conversion efficiency. As a result, power electronic converters are critical in extracting the most possible power from PV modules and converting it into a grid-compatible format. newlineThese are often classified into two types: dual-stage (with dc/dc converter) and single-stage (without dc/dc converter). The single-stage inverter topology has several advantages over the dual-stage inverter architecture, including fewer active semiconductor switches, improved efficiency, and increased dependability. Because of its single-stage power conversion, the Z-source inverter (ZSI) has been employed for PV power systems. The ZSI achieves a voltage buck/boost in one phase using an impedance network that connects the inverter main circuit to the PV. While in ZSI shoot-through mode, energy is stored in inductors and released when the mode is switched to non-shoot-through mode, followed by the voltage boost function. As a result, the Shoot-through state will be improved to achieve high gain, which increases Total Harmonics Distortion (THD), conduction losses, and overall system efficiency. In this thesis, proposed quasi Z-Source Inverter (qZSI) is created to address this drawback. newline