Comparative Analysis of Three Phase 5,7 9 Level Inverter Using PDPWM Technique

This paper depicts the Simulink model of three phase five, seven & nine level inverter. Conventional three phase two level and three level introduces more harmonics in system or motor due to which quality of the current, voltage decreases. It also increases the losses of motor. So, to reduce the THD, losses and to improve the motor behavior multilevel inverter is used. The multilevel inverters (MI) with a more number of steps can produce high quality voltage output. In this paper cascaded inverter topology is used to make five, seven & nine level inverter. Increase in level reduces the % THD and improves load behavior. SPWM (phase disposition) used to control the output of multilevel inverter. Control of output voltage of inverter is also very easy with PDPWM. The simulation of three phase five, seven & nine level is done using MATLAB/Simulink.