Cascaded H-Bridge Multilevel Inverter for PV Applications

Abstract

In present scenario, photovoltaic power systems are getting extensive with the rapid magnification in the energy consumption and the care for the environmental contamination. Present PV systems are ranging from few kilowatts to several megawatts; therefore, grid integration of PV system is getting prominence in many countries. Multilevel inverter acts as a promising solution for grid connected PV systems due to their substitutable and reduced voltage stress over the switches. Out of different structures, cascaded H-bridge multilevel inverter is highly appropriate for PV approach since every PV panel can act as an individual DC source for every cascaded H-bridge module. In this paper, a comparative analysis of four different levels of multilevel inverter is presented. Control scheme designed on sinusoidal pulse width modulation (SPWM) is used due to its ease of implementation. As the number of levels increases, results in reduced total harmonic distortion (THD) and the output will be nearly sinusoidal.