A New Rv Multilevel Inverter For Induction Motor Drive Applications

-----------------------------------------------------ABSTRACT----------------------------------------------------In recent years, multilevel inverters have gained much attention in the application areas of medium voltage and high power owing to their various advantages such as lower common mode voltage, lower voltage stress on power switches, lower dv/dt ratio to supply lower harmonic contents in output voltage and current. Comparing two-level inverter topologies at the same power ratings, MLIs also have the advantages that the harmonic components of line-to-line voltages fed to load are reduced owing to its switching frequencies. The most common MLI topologies classified into three types are diode clamped MLI (DC-MLI), flying capacitor MLI (FC-MLI), and cascaded H-Bridge MLI (CHB-MLI). The hybrid and asymmetric hybrid inverter topologies have been developed according to the combination of existing MLI topologies or applying different DC bus levels respectively. This paper proposes a new Multilevel Inverter for Induction Motor Drive. The Inverter presented gives a seven level output voltage. This inverter uses very less number of switches when compared with the other type of multi inventers like diode clamped, flying capacitor, and cascaded inventers. This topology requires very less number of carrier signals and gate drivers, especially when used for higher levels. The above discussed inverter is fed to a induction motor drive and the performance of the motor is analyzed for nine level and eleven levels.