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Analytical Evaluation of Harmonic Distortion in PWM AC Drives Using the Notion of Stator Flux Ripple

Narayanan, G and Ranganathan, VT (2005) Analytical Evaluation of Harmonic Distortion in PWM AC Drives Using the Notion of Stator Flux Ripple. In: IEEE Transactions on Power Electronics, 20 (2). pp. 466-474.


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This paper presents a method to evaluate harmonic distortion due to space vector-based PWM strategies for AC drives. The proposed method is general enough to deal with division of zero vector time as well as division of active vector time within a subcycle. The method is based on the notion of stator flux ripple, which is a measure of line current ripple. Expressions for RMS ripple over a subcycle are derived for six switching sequences in terms of magnitude and angle of the reference vector, and subcycle duration. The sequences considered include those involving division of active vector time within a subcycle. Further, analytical closed form expressions are derived for the total RMS harmonic distortion factor corresponding to six space vector-based synchronized PWM strategies, proposed recently, for high power drives. The square of the distortion factor turns out to be a quadratic polynomial in modulation index (M), and the coefficients differ with PWM strategies and pulse numbers. These expressions are validated through Fourier analysis as well as experimental measurements. The concept of stator flux ripple provides insight into current ripple as well as torque ripple corresponding to different sequences and strategies.

Item Type: Journal Article
Publication: IEEE Transactions on Power Electronics
Publisher: IEEE
Additional Information: �©2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: Harmonic analysis;harmonic distortion;induction motor drives;inverters;pulse width modulation;PWM inverters;space vector;space vector PWM;stator flux ripple;switching sequence;time domain analysis;vectors
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 22 Jul 2005
Last Modified: 19 Sep 2010 04:19
URI: http://eprints.iisc.ac.in/id/eprint/3371

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