Simulation and Analysis of Multicarrier PWM Techniques for Reduced Device Count Multilevel Inverter.
In this developing period, a trend is Multilevel inverters due to the advancement in power conversion technology. Multilevel inverters provide multi stepped output levels that is better than two or three level inverters. By increasing the voltage levels, number of semiconductor devices and DC sources are also increase. To overcome this drawback of MLI, the reduced device count topologies are used. The asymmetrical DC voltage sources are used in reduced device count multilevel inverter to get the desired 7 voltage levels. The multicarrier PWM techniques are used to reduce the switching losses and generate switching signals for RDC MLI. The multicarrier PWM techniques are utilized in RDC MLI to get effective output voltage with less harmonics. The focus of this paper to implement and analyze the level-shifted POD and APOD multicarrier pulse- width modulation technique in reduced device count CHB Multilevel inverter. The circuit is simulated and analyzed by MATLAB software. The alternate phase opposition disposition (APOD) MCPWM has less THD than phase opposition disposition (POD) MCPWM. Therefore, the APOD MCPWM has better performance in reduced device count multilevel inverter.