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Synchronised Bus-Clamping PWM Strategies based on Space Vector Approach for Modulation upto Six-step Mode

Narayanan, G and Ranganathan, VT (1998) Synchronised Bus-Clamping PWM Strategies based on Space Vector Approach for Modulation upto Six-step Mode. In: IEEE International Conference on Power Electronic Drives and Energy Systems for Industrial Growth - PEDES '98, Dec 1998, Perth, Australia, pp. 996-1001.


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Synchronised PWM waveforms with 3-phase, half-wave and quarter-wave symmetries are required in VSI-fed high-power ac drives. The flexibilities of the space vector approach to modulation can be utilised for real-time generation of more than one family of synchronised PWM waveforms, maintaining all the symmetries with any odd pulse number. Two such synchronised PWM strategies are proposed in this paper along with an overmodulation scheme for operation upto six-step mode, maintaining the modulator gain constant in the whole range. The proposed overmodulation scheme does not require any evaluation of quadratic or cubic expressions, or any look-up table except for storing sine values. These two strategies result in a harmonic distortion better than those of comparable ones at higher modulation indices for low pulse numbers of 5 and 7. A combination of these two strategies along with two other bus-clamping strategies and the conventional space vector strategy, leads to a significant reduction in the harmonic currents in constant V/f induction motor drives as shown by the theoretical as well as experimental results.

Item Type: Conference Paper
Additional Information: �©1998 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: Pulse width modulation; synchronised PWM; space vector; space vector PWM; PWM inverters; induction motor drives; high power drives; overmodulation.
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 25 Jul 2005
Last Modified: 19 Sep 2010 04:19
URI: http://eprints.iisc.ac.in/id/eprint/3384

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