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Investigations on Optimal Pulse-Width Modulation to Minimize Total Harmonic Distortion in the Line Current

Tripathi, Avanish and G, Narayanan (2015) Investigations on Optimal Pulse-Width Modulation to Minimize Total Harmonic Distortion in the Line Current. In: IEEE India International Conference on Power Electronics - 2015, 08/12/2014 to 10/12/2014, NIT-Kurukshetra, Harayana.

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Abstract

PWM waveforms with positive voltage transition at the positive zero crossing of the fundamental voltage (type-A) are generally considered for PWM waveform with even number of switching angles per quarter whereas, waveforms with negative voltage transition at the positive zero crossing (type-B) are considered for odd number of switching angles per quarter. Optimal PWM, for minimization of total harmonic distortion of line to line (VWTHD), is generally solved with the aforementioned criteria. This paper establishes that a combination of both types of waveforms gives better performance than any individual type in terms of minimum VWTHD for complete range of modulation index (M). Optimal PWM for minimum VWTHD is solved for PWM waveforms with pulse numbers (P) of 5 and 7. Both type-A and type-B waveforms are found to be better in different ranges of M. The theoretical findings are confirmed through simulation and experimental results on a 3.7 kW squirrel cage induction motor in an open-loop V/f drive. Further, the optimal PWM is analysed from a space vector point of view.

Item Type: Conference Proceedings
Keywords: Harmonic analysis, harmonic distortion, induction motor drive, off-line pulse width modulation, optimal pulse width modulation, voltage-source inverter
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Depositing User: Mr Avanish Tripathi
Date Deposited: 22 Jun 2015 04:47
Last Modified: 22 Jun 2015 04:47
URI: http://eprints.iisc.ac.in/id/eprint/51680

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