Novel Switching Sequences for a Space-Vector-Modulated Three-Level Inverter

Das, Soumitra and Narayanan, G (2012) Novel Switching Sequences for a Space-Vector-Modulated Three-Level Inverter. In: IEEE Transactions on Industrial Electronics, 59 (3). pp. 1477-1487.

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Abstract

A three-level inverter produces six active vectors, each of normalized magnitudes 1, 0.866, and 0.5, besides a zero vector. The vectors of relative length 0.5 are termed pivot vectors.The three nearest voltage vectors are usually used to synthesize the reference vector. In most continuous pulsewidth-modulation(PWM) schemes, the switching sequence begins from a pivot vector and ends with the same pivot vector. Thus, the pivot vector is applied twice in a subcycle or half-carrier cycle. This paper proposes and investigates alternative switching sequences, which use the pivot vector only once but employ one of the other two vectors twice within the subcycle. The total harmonic distortion(THD) in the fundamental line current pertaining to these novel sequences is studied theoretically as well as experimentally over the whole range of modulation. Compared with centered space vector PWM, two of the proposed sequences lead to reduced THD at high modulation indices at a given average switching frequency.

Item Type:	Journal Article
Publication:	IEEE Transactions on Industrial Electronics
Publisher:	IEEE
Additional Information:	Copyright 2011 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;multilevel inverter; neutral-point clamped (NPC) inverter;pulsewidth modulation; space vector;stator flux ripple;voltage source inverter
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	22 Nov 2011 06:30
Last Modified:	22 Nov 2011 06:30
URI:	http://eprints.iisc.ac.in/id/eprint/42270

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