COMPARATIVE ANALYSIS OF MULTILEVEL INVERTER TOPOLOGIES FOR INDUCTION MOTOR DRIVE APPLICATIONS

V S Prasadarao K, Gandham Tabita

Abstract: Induction motors are widely used in industries, because they are rugged, reliable and economical and hence they are called as work horse power of industry. Induction motor drive requires suitable converters to get the required speed and torque without or negligible ripples. Multilevel inverters can do this job. But the conventional MLIs such as Diode Clamped MLIs requires extra diodes in conjunction with the active switches, Flying capacitor MLIs requires extra Capacitors and control also difficult if the levels increases and the Cascaded H-bridge MLIs requires separate dc sources which limits its use. This paper proposes a new type of multi level Inverter which converts the dc into ac using less number of switches when compared to conventional multilevel Inverters. The proposed Inverter uses only seven switches to get 13-level output voltage compared conventional cascaded H-bridge uses twelve switches. The comparison between the conventional MLIs and proposed inverter is presented in this paper. Finally the induction motor using proposed inverter with thirteen level is simulated using Matlab/Simulink environment and the corresponding results are presented in this paper.

Keywords: Grid interconnection, PV system, MLI, Renewable energy sources (RES).

DOI: https://doi.org/10.15623/ijret.2013.0211036