Harmonic Elimination with Nine Level Inverter for Single Phase Grid Connected System

Abstract

Multilevel inverter has emerged recently as a very important alternative in the area of high-power medium voltage energy control. This project present cascaded multi cell with separate DC sources. Multilevel inverters are promising they have nearly sinusoidal output-voltage waveforms, output with better harmonic profile, less stressing of electronic components. The conventional is a single-phase seven-level inverter for grid connected photovoltaic systems, with a novel pulse width-modulated (PWM) control scheme .In a conventional concept to get the nine level inverter output voltage using a four full bridge cascaded type inverter. The inverter is capable of producing nine levels of output-voltage levels from the dc supply voltage. The proposed inverter system is capable of producing nine level of output voltage levels dc supply voltage by using three full bridge cascaded topology type inverter. In this project has used to three H-bridge inverter with different dc sources. The multi-level inverters promising the high performance with reduced EMI and harmonics. The proposed project is nine-level inverter was designed and results were also shown in the thesis. This project is focused on minimizing the number of semiconductors devices for a given number of levels.