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Space vector-based analysis of overmodulation in triangle-comparison based PWM for voltage source inverter

Modi, Manoj Kumar and Venugopal, S and Narayanan, G (2013) Space vector-based analysis of overmodulation in triangle-comparison based PWM for voltage source inverter. In: SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES, 38 (3). pp. 331-358.

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Official URL: http://dx.doi.org/10.1007/s12046-013-0149-x


The equivalence of triangle-comparison-based pulse width modulation (TCPWM) and space vector based PWM (SVPWM) during linear modulation is well-known. This paper analyses triangle-comparison based PWM techniques (TCPWM) such as sine-triangle PWM (SPWM) and common-mode voltage injection PWM during overmodulation from a space vector point of view. The average voltage vector produced by TCPWM during overmodulation is studied in the stationary (a-b) reference frame. This is compared and contrasted with the average voltage vector corresponding to the well-known standard two-zone algorithm for space vector modulated inverters. It is shown that the two-zone overmodulation algorithm itself can be derived from the variation of average voltage vector with TCPWM. The average voltage vector is further studied in a synchronously revolving (d-q) reference frame. The RMS value of low-order voltage ripple can be estimated, and can be used to compare harmonic distortion due to different PWM methods during overmodulation. The measured values of the total harmonic distortion (THD) in the line currents are presented at various fundamental frequencies. The relative values of measured current THD pertaining to different PWM methods tally with those of analytically evaluated RMS voltage ripple.

Item Type: Journal Article
Additional Information: Copyrright of this article is belongs to Indian Academy of Sciences
Keywords: Pulse width modulation; harmonic distortion; overmodulation; space vector; voltage ripple; voltage source inverter
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 25 Sep 2013 11:54
Last Modified: 25 Sep 2013 11:54
URI: http://eprints.iisc.ac.in/id/eprint/47318

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