Investigation of extended boost quasi z source inverter for pv applications

Abstract

Renewable energy resources are gaining global significance in the recent days as the conventional energy resources get exhausted at a faster rate. Such systems require no fuel cost and have less environmental pollution with a low noise level emission. The new technological developments in renewable systems make them an important alternative energy source for power generation. Energy harvesting from the photovoltaic (PV) power generation is the promising renewable technology nowadays in the developing countries newlineto meet the increasing energy demands with a reduced fuel cost. They require a power conditioning unit with high input voltage gain to match the voltage difference and to compensate the variations in the output voltage of the PV array. The single-stage PV conversion system is becoming popular nowadays due to the reduction in the number of intermediate power conversion stages, the decrease in the system cost, size and the space newlinerequirement. Such a conversion system decreases the complexity in the circuit design, thereby maximizing the system efficiency and the voltage gain. The power electronic converter interfaced between the PV and the grid has an impact on the system performance. The existing single-stage system suffers from a reduction in the voltage gain due to limitations in the improvement of the voltage boost ratio. This research work focuses on the performance improvement of the single-stage PV system with new enhanced, extended boost quasi-inverter (EB q-ZSI). The research work concentrates on areas such as modeling of the photovoltaic system, the analysis of the extended boost q-ZSI topologies, the investigation of the three different control techniques, the study of tracking algorithms for enhancing the tracking efficiency in maximum power extraction and the application in the area of the grid system. The simulation of the photovoltaic system is more accurate if the simulation with a precise PV model before installation is considered. The PV model is developed in MATLAB/ Simulink and is te