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Analytical Closed-Form Expressions for Harmonic Distortion Corresponding to Novel Switching Sequences for Neutral-Point-Clamped Inverters

Das, Soumitra and Narayanan, G (2014) Analytical Closed-Form Expressions for Harmonic Distortion Corresponding to Novel Switching Sequences for Neutral-Point-Clamped Inverters. In: IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, 61 (9). pp. 4485-4497.

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Official URL: http://dx.doi.org/10.1109/TIE.2013.2293708

Abstract

Analytical closed-form expressions for harmonic distortion factors corresponding to various pulsewidth modulation (PWM) techniques for a two-level inverter have been reported in the literature. This paper derives such analytical closed-form expressions, pertaining to centered space-vector PWM (CSVPWM) and eight different advanced bus-clamping PWM (ABCPWM) schemes, for a three-level neutral-point-clamped (NPC) inverter. These ABCPWM schemes switch each phase at twice the nominal switching frequency in certain intervals of the line cycle while clamping each phase to one of the dc terminals over certain other intervals. The harmonic spectra of the output voltages, corresponding to the eight ABCPWM schemes, are studied and compared experimentally with that of CSVPWM over the entire modulation range. The measured values of weighted total harmonic distortion (WTHD) of the line voltage V-WTHD are used to validate the analytical closed-form expressions derived. The analytical expressions, pertaining to two of the ABCPWM methods, are also validated by measuring the total harmonic distortion (THD) in the line current I-THD on a 2.2-kW constant volts-per-hertz induction motor drive.

Item Type: Journal Article
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Additional Information: Copyright for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, USA
Keywords: Advanced bus-clamping pulsewidth modulation (ABCPWM); closed-form expression; harmonic distortion; multilevel inverter; neutral-point-clamped (NPC) inverter; pulsewidth-modulated inverter; space-vector modulation; switching sequence; voltage-source inverter
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 27 May 2014 06:54
Last Modified: 27 May 2014 06:54
URI: http://eprints.iisc.ernet.in/id/eprint/49008

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