A Novel Method of Nine Level Inverter Fed Induction Motor Drive

Abstract

A nine level multilevel inverter technology has emerged recently as a very important alternative in the area of high-power medium-voltage control and also for improving the total harmonic distortion by reducing the harmonics. Generally, the poor quality of voltage and current of a conventional inverter fed induction machine is obtained due to the presence of harmonics and hence there is a significant level of energy losses. The nine level inverter is used to reduce the harmonics. So, this paper presents the simulation of three phases nine level inverter fed induction motor drive. In inverters by increasing the number of steps it generates the very high quality of the output voltage and current. This paper presents a nine levels multi level inverter and these nine levels can follow a voltage reference with accuracy and with the advantage that the generated voltage can be modulated in amplitude instead of pulse-width modulation. Therefore a harmonic elimination method is applied to eliminate any number of specific higher order harmonics of multilevel converters with unequal dc voltages. The effectiveness of the system is verified through simulation using MATLAB / SIMULINK package.