DefinePK

Abstract

The Multilevel inverters are used to obtain the desired AC voltage from several levels of DC voltage and also reduce the filter requirement in the system. It has more advantages when compared to traditional two level inverter. This paper proposes Multi carrier pulse width modulation (MCPWM) and multiple sinusoidal pulse width modulation techniques (MSPWM) based Modified Multilevel Inverter with reduced number of switches. Reduced harmonic distortion is achieved in the output voltage waveform without reduction in the output power using these techniques. The inverter is able to produce seven and nine levels from the dc supply source. The analysis has been made based on the Total Harmonic Distortion (THD). The pulse width modulation techniques used in this paper are MSPWM and MCPWM with triangular wave as carrier wave. The proposed inverter is simulated in Matlab/Simulink. The hardware prototype implementation is done using Power MOSFET switches and the THD is analysed using Power Quality Analyser.