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Title: Current control for dual three-phase permanent magnet synchronous motors accounting for current unbalance and harmonics
Authors: Hu, Yashan
Zhu, Zi-Qiang
Liu, Kan
Keywords: Current harmonics
Current unbalance
Double star permanent magnet (PM) motor
Dual three-phase
Six-phase PM motor
Issue Date: 2014
Publisher: © IEEE
Citation: HU, Y., ZHU, Z.Q. and LIU, K., 2014. Current Control for Dual Three-Phase Permanent Magnet Synchronous Motors Accounting for Current Unbalance and Harmonics. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2(2), pp. 272-284.
Abstract: © 2014 IEEE.This paper proposes an improved vector space decomposition current control scheme for dual three-phase permanent magnet (PM) synchronous motors having two sets of three-phase windings spatially shifted by 30° electrical degrees. A proportional-integral (PI) and resonant (second) controller is developed for eliminating the current unbalance in αβ subplane, which is effective irrespective of the degree of current unbalance, while PI plus multifrequency resonant (second and sixth) control is employed to eliminate the current unbalance, fifth and seventh current harmonics in z1z2 subplane. Compared with existing methods only accounting for current unbalance in z1z2 subplane, the proposed method has considered the current unbalances in both z1z2 and αβ subplanes and can eliminate them simultaneously at the steady-state of operation. Consequently, the full compensation of current unbalance can be achieved, by which both the current unbalance between two sets and current unbalance between phase windings in each set are eliminated. Meanwhile, the fifth and seventh current harmonics caused by nonsinusoidal back electromotive force and inverter nonlinearity can also be fully compensated. The effectiveness of proposed method is verified by a set of comparative experiments on a prototype dual three-phase PM machine system. It shows that fully balanced currents without the fifth and seventh current harmonics at the steady state of operation can be achieved.
Description: Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Version: Accepted for publication
DOI: 10.1109/JESTPE.2014.2299240
URI: https://dspace.lboro.ac.uk/2134/25035
Publisher Link: http://dx.doi.org/10.1109/JESTPE.2014.2299240
ISSN: 2168-6777
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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