Simulation Of Multilevel Inverter With Six Switches

Abstract

Many industrial applications demand an inverter for its faithful and smooth operation. Research is going on to make the inverter more efficient. As the industry demand is to get more power with reduced harmonics, a Multilevel Inverter (MLI) is a viable solution. In an MLI output voltage is derived from multiple dc voltage sources connected at the input side. The higher the number of levels for the inverter, the lesser will be the harmonics present in the output voltage but the number of switch and associated auxiliary requirements will increase. MATLAB simulation was performed with a five-level cascaded H Bridge Multilevel Inverter (CHB-MLI) with eight switches. Later to improve the performance and efficiency of the inverter the count of switches was reduced to six and simulations were performed on the modified version. The control technique used for pulse generation is Phase disposition pulse width modulation(PD-PWM. Simulation of both inverters using MATLAB Simulink was performed and comparison of THD results are presented.