A New Asymmetrical MLI with Reduced Switch Count for a Three Phase Induction Motor
1Dr.R.Geetha*, Associate Professor, Department of Electrical Engineering, Annamalai University, Annamalai Nagar, Tamil Nadu, India.
2Dr.M.Ramaswamy, Professor, Department of Electrical Engineering, Annamalai University, Annamalai Nagar, Tamil Nadu, India.
Manuscript received on April 20, 2020. | Revised Manuscript received on April 29, 2020. | Manuscript published on May 10, 2020. | PP: 728-737 | Volume-9 Issue-7, May 2020. | Retrieval Number: G4970059720/2020©BEIESP | DOI: 10.35940/ijitee.G4970.059720
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: 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.
Keywords: Induction motor, Total harmonic distortion, Phase disposition, Pulse width modulation, Series parallel switched multilevel inverter.
Scope of the Article: Artificial Intelligence and Machine Learning