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A disturbance observer-based current-constrained controller for speed regulation of PMSM systems subject to unmatched disturbances

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journal contribution
posted on 18.10.2021, 09:54 by Chen Dai, Tianliang Guo, Jun YangJun Yang, Shihua Li
The speed regulation problem of permanent magnet synchronous motor system is investigated under a noncascade structure. Despite its superiority in straightforward control design, simple parameter adjustment, and satisfying system dynamic performance, the structure brings two problems: the overcurrent protection and unmatched disturbance rejection. Under this structure, the current cannot any more be restricted by a reference value, and ought to be constrained within a certain range to ensure the circuit safety. Besides, unmatched disturbances, mainly caused by external load torques, may result in undesired interference and violate the constraint requirement, since they affect the current directly via the same channel. Toward that end, a novel current-constrained control algorithm is designed to tackle the current constraint and unmatched disturbances simultaneously. A disturbance observer (DOB) is utilized for unmatched disturbance estimation. A constraint coping mechanism is constructed to restrict the current. Then, a key nonlinear item is proposed by augmenting the disturbance estimation and the constrained current. Finally, a composite controller is proposed with concise structure and rigorous closed-loop stability analysis. Numerical and experimental tests further validate that the proposed control approach achieves promising speed tracking performance and guarantees the current constraint in the presence of unmatched disturbances.

Funding

National Natural Science Foundation (NNSF) of China under Grant 61973080 and Grant 61973081

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

IEEE Transactions on Industrial Electronics

Volume

68

Issue

1

Pages

767 - 775

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Version

AM (Accepted Manuscript)

Rights holder

© IEEE

Publisher statement

© 2020 IEEE. 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.

Acceptance date

09/06/2020

Publication date

2020-07-03

Copyright date

2020

ISSN

0278-0046

eISSN

1557-9948

Language

en

Depositor

Dr Jun Yang. Deposit date: 14 October 2021