Certain investigations on the improved Multilevel inverter topology for solar pv Application

Abstract

The power demand is increasing progressively worldwide; the renewable energy sources (RES) are more contributing due to the depletion of fossil fuel and causes of environmental factors. Among various RES such as wind energy, Fuel cell, Biogas, and Photo Voltaic (PV) system, solar PV is the most attractive one in power generation due to its huge availability, absence of dynamic component, low maintenance, lower failure rate, and pollution-free. The PV panels convert the solar irradiance to DC power and the series connection of panels can increase the output voltage. In order to implement in standalone and grid-connected system or motor drive system whereas the power conversion unit is an essential part this may include dc/dc converter and dc/ac inverter. The dc/dc converter regulates the nonlinear dc output and also boosts its magnitude. In general, voltage source inverters (VSI) are employed in the solar PV application to convert the DC power into AC power; however, in the conventional two-level inverter, the number of components required, Total Harmonic Distortion (THD), power losses, and Electromagnetic Interference (EMI) are high which reduce the reliability, efficiency of the inverter and distort the output waveform. To increase the output quality, the staircase waveform is generated with the multilevel inverters (MLI) topology. In recent years, MLI is developed for various applications, but still, it requires more number of switches, gate driver circuits, dc sources. Also, it has high voltage stress for higher voltage level generation. To overcome these shortcomings, a new MLI is developed in this proposed work. The present research work focuses to develop a new MLI topology for both symmetric and asymmetric configurations with a reduced number of power components for solar PV application newline