Reduced Number of Power electronic devices for Three-Phase Cascaded Multilevel Inverter fed Induction Motor

Mr. M. Sai Ganesh, Terukoti Divya

Abstract


Multilevel inverters have an attracted a great deal of attenuation in medium voltage and high power application Due to their lower switching losses, EMI, high efficiency. This paper proposes to Cascade H bridge multilevel inverter to reduced total harmonic Distortion by increase the output voltage level. In this paper Three-Phase Cascaded Multilevel Inverter Based on a New Basic Unit with Reduced Number of Power Switches fedinduction motor. Thus multilevel inverter topologies are becoming more popular. A multilevel inverter topology is discussed. The inverter consists of series connection of a number of basic units. Therefore, multilevel inverters had been introduced and are being developed now. With an increasing number of dc voltage sources in the input side, a sinusoidal like waveform can be generated at the output. As a result, the total harmonic distortion (THD) decreases, and the output waveform quality increases, which are the two main advantages of multilevel inverters. In addition, lower switching losses, lower voltage stress of dv/dt on switches, and better electromagnetic interference are the other most important advantages of multilevel inverters. These features are obtained by the comparison of the conventional cascaded multilevel inverters with the proposed cascaded topology. The ability of the proposed inverter to generate all voltage levels (even and odd) is reconfirmed by using the simulation results of a 15-level inverter and three phase 15-level inverter fed induction motor.Induction motors are widely used in industries, because they are rugged, reliable and economical. Induction motor drive requires suitable converters to get the required speed and torque without or negligible ripples. The simulation results are presented by using Matlab/Simulink Model.


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