Open AccessA New Asymmetrical MLI with Reduced Switch Count for a Three Phase Induction Motor
Author(s) -
Geetha Rv,
M. Ramaswamy
Publication year - 2020
Publication title -
international journal of innovative technology and exploring engineering
Language(s) - English
Resource type - Journals
ISSN - 2278-3075
DOI - 10.35940/ijitee.g4970.059720
Subject(s) - total harmonic distortion , pulse width modulation , induction motor , voltage , inverter , stator , topology (electrical circuits) , control theory (sociology) , modulation (music) , matlab , three phase , computer science , electronic engineering , engineering , electrical engineering , physics , acoustics , control (management) , artificial intelligence , operating system
This work explores a novel multilevel inverter (MLI) topology to minimize the number of power switches in the passage of current to accomplish each level of the output voltage. The unequal magnitudes of the dc voltage sources in attempt to realize higher levels of the output voltage bring in the asymmetrical nature of operation. It involves a series parallel switched configuration with bidirectional switches to avert the flow of circulating current in between the two H - bridges in each phase of the MLI. The effort incites to use the theory of a new Pulse Width Modulation (PWM) strategy for mitigating the higher frequency components of the voltage applied to the stator. It imbibes the Phase Disposition (PD) principles in the modulating strategy for arriving at the sinusoidal shape for the output voltage . Total Harmonic Distortion (THD) indexed by lower values for the output voltage over the traditional firing scheme serves to be the highlight for the MLI in acclaiming its place in the inverter world. The results obtained through MATLAB based simulation over a range of modulation indices. The performance measured in terms of the THD claims its suitability for use in Induction Motor (IM) drives.