DEVELOPMENT OF 13 LEVEL CASCADED H BRIDGE MULTILEVEL INVERTER MATLAB SIMULATION

Power quality plays a vital role in power system transmission and distribution. Due to the increase in the demand of power and it's consumption, power quality is highly disrupted. The most popular device used to address this problem of power quality is Multi Level Inverter. The aim of this paper is to develop a 13- level inverter using MATLAB Simulink. In this paper, comparison of Total Harmonic Distortion (THD) is performed for 7, 9, 11 and 13 level inverters using MATLAB Simulink. THD calculations are done using Sine Wave Pulse Width Modulation technique (SPWM In-phase) and Cascaded H-bridge(with separate DC sources) inverter as they possess less switching losses compared to other topologies. The work shows how the efficiency of output of multilevel inverter increases as the level of inverter increases with the reduction of THD. FFT analysis is provided for all level inverters to calculate THD.