A Three-Phase Inverter Based Overmodulation Strategy of Asymmetrical Six-Phase Induction Machine

Paul, S and Basu, K (2021) A Three-Phase Inverter Based Overmodulation Strategy of Asymmetrical Six-Phase Induction Machine. In: IEEE Transactions on Power Electronics, 36 (5). pp. 5802-5817.

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Abstract

Overmodulation (OVM) techniques of asymmetrical six-phase induction machine (ASIM) achieve higher dc-bus utilization by applying nonzero average voltage in nonenergy transfer plane. This results into unwanted current and associated copper loss. Existing OVM techniques reduce this loss with pulsewidth modulation (PWM) techniques from six-dimensional space vector perspective, which is both conceptually difficult and computationally challenging. The computational complexity of space vector based techniques is reduced by few existing PWM techniques in linear region by splitting the six-phase inverter as two three-phase inverters and modulate these inverters with linear PWM techniques in 30\circ phase shifted. This is referred as three-phase inverter based technique in the title. But, three-phase inverter based OVM technique does not exist in the literature due to lack of knowledge of the relationship between six-dimensional space vectors and space vectors of two three-phase inverters. This article first establishes this relation. Based on this relation, an OVM technique is proposed where the reference voltage vectors of two inverters are phase shifted by 30\circ but of different magnitudes. The proposed technique achieves THD and WTHD performances similar to space vector based best technique of ASIM with reduced computational complexity, as shown in details. The proposed strategy is validated through experiments and simulations on six-phase induction machine at 4.2 kW. © 1986-2012 IEEE.

Item Type:	Journal Article
Publication:	IEEE Transactions on Power Electronics
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Asynchronous machinery; Computational complexity; Pulse width modulation; Vector spaces; Vectors, Bus utilizations; Dimensional spaces; Overmodulation; PWM techniques; Reference voltages; Six-phase induction machines; Six-phase inverters; Three-phase inverter, Electric inverters
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	20 Feb 2023 11:20
Last Modified:	20 Feb 2023 11:20
URI:	https://eprints.iisc.ac.in/id/eprint/80425

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