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Combined positive-sequence flux estimation and current balancing for sensorless motor control under imbalanced conditions

Combined positive-sequence flux estimation and current balancing for sensorless motor control under imbalanced conditions
Combined positive-sequence flux estimation and current balancing for sensorless motor control under imbalanced conditions

Sensorless motor control under imbalanced conditions, commonly caused by the use of an imbalanced cable, poses a number of challenges relating to stability and power quality. With reference to stability, concerns arise because the angle and frequency estimates of conventional phase-locked loops (PLLs) and observers deteriorate in the presence of imbalance, which in turn degrades the response of synchronous-reference-frame current controllers. Power quality is also degraded due to the asymmetry of the currents supplied to the motor, which results in torque ripple and increased motor losses. In this article, an adaptive positive-sequence flux estimator based on second-order generalized integrators is presented to solve these problems. The balanced fluxes generated by the estimator are suitable for PLL-based sensorless control of a motor over an imbalanced cable. With negligible additional computational effort, the flux estimator also provides negative-sequence current estimates, which are then controlled to balance the motor currents. Simulation and experimental results with a permanent magnet synchronous motor run by a commercial motor drive via a flat long electrical submersible pumping cable are presented. It is shown that the proposed method can prevent instabilities that occur when using conventional flux estimation methods and reduce current imbalance by approximately 10 to 20 times, to less than 1%.

Asymmetry, Electrical Submersible Pumping (ESP), Flux estimator, Imbalance, Phase-Locked Loop (PLL), Second-Order Generalized Integrator (SOGI), Sensorless vector control,, Unbalance
0093-9994
5099-5107
Orfanoudakis, Georgios I
ec0d2453-6df3-4faa-8ee7-bbe9df247826
Sharkh, Suleiman
c8445516-dafe-41c2-b7e8-c21e295e56b9
Yuratich, Michael A
9a6bc8d3-f09e-4b79-8051-af0eaa7b51a0
Orfanoudakis, Georgios I
ec0d2453-6df3-4faa-8ee7-bbe9df247826
Sharkh, Suleiman
c8445516-dafe-41c2-b7e8-c21e295e56b9
Yuratich, Michael A
9a6bc8d3-f09e-4b79-8051-af0eaa7b51a0

Orfanoudakis, Georgios I, Sharkh, Suleiman and Yuratich, Michael A (2021) Combined positive-sequence flux estimation and current balancing for sensorless motor control under imbalanced conditions. IEEE Transactions on Industry Applications, 57 (5), 5099-5107, [9468395]. (doi:10.1109/TIA.2021.3093253).

Record type: Article

Abstract

Sensorless motor control under imbalanced conditions, commonly caused by the use of an imbalanced cable, poses a number of challenges relating to stability and power quality. With reference to stability, concerns arise because the angle and frequency estimates of conventional phase-locked loops (PLLs) and observers deteriorate in the presence of imbalance, which in turn degrades the response of synchronous-reference-frame current controllers. Power quality is also degraded due to the asymmetry of the currents supplied to the motor, which results in torque ripple and increased motor losses. In this article, an adaptive positive-sequence flux estimator based on second-order generalized integrators is presented to solve these problems. The balanced fluxes generated by the estimator are suitable for PLL-based sensorless control of a motor over an imbalanced cable. With negligible additional computational effort, the flux estimator also provides negative-sequence current estimates, which are then controlled to balance the motor currents. Simulation and experimental results with a permanent magnet synchronous motor run by a commercial motor drive via a flat long electrical submersible pumping cable are presented. It is shown that the proposed method can prevent instabilities that occur when using conventional flux estimation methods and reduce current imbalance by approximately 10 to 20 times, to less than 1%.

Text
IEEE paper - SOGI-Balancing - FINAL - Reference copy - Accepted Manuscript
Restricted to Repository staff only until 29 June 2023.
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Accepted/In Press date: 5 June 2021
e-pub ahead of print date: 29 June 2021
Published date: 1 September 2021
Additional Information: Funding Information: Manuscript received December 9, 2020; revised April 2, 2021; accepted June 5, 2021. Date of publication June 29, 2021; date of current version September 16, 2021. Paper 2020-IPCC-1712.R1, presented at the 21st European Conference on Power Electronics and Applications, Genova, Italy, Sep. 2–6, and approved for publication in the IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS by the Industrial Power Converter Committee of the IEEE Industry Applications Society. This work was supported by TSL Technology Ltd, Southampton, U.K. (Corresponding author: Suleiman M. Sharkh.) Georgios I. Orfanoudakis is with the Department of Electrical and Computer Engineering, Hellenic Mediterranean University, Heraklion 71410, Greece (e-mail: gorfas@hmu.gr). Publisher Copyright: © 1972-2012 IEEE.
Keywords: Asymmetry, Electrical Submersible Pumping (ESP), Flux estimator, Imbalance, Phase-Locked Loop (PLL), Second-Order Generalized Integrator (SOGI), Sensorless vector control,, Unbalance

Identifiers

Local EPrints ID: 450117
URI: http://eprints.soton.ac.uk/id/eprint/450117
ISSN: 0093-9994
PURE UUID: 6f233202-d43a-4c2c-b281-e4826706097c
ORCID for Suleiman Sharkh: ORCID iD orcid.org/0000-0001-7335-8503

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Date deposited: 12 Jul 2021 16:30
Last modified: 25 Nov 2022 02:34

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Contributors

Author: Georgios I Orfanoudakis
Author: Suleiman Sharkh ORCID iD
Author: Michael A Yuratich

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