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A modified flux regulation method to minimize switching frequency and improve DTC-hysteresis-based induction machines in low-speed regions

A modified flux regulation method to minimize switching frequency and improve DTC-hysteresis-based induction machines in low-speed regions
A modified flux regulation method to minimize switching frequency and improve DTC-hysteresis-based induction machines in low-speed regions

Direct torque control (DTC) suffers from flux droop owing to the long zero-voltage vectors at low motor speeds. Previous studies were able to attain flux regulation by imposing the continuous switching of forward and reverse active voltage vectors by causing torque overshoots in the torque hysteresis bands (THBs). This led to an excessive increase in the switching frequency and larger torque and current ripples, thus reducing the drive efficiency. In this paper, a modified flux regulation method is proposed for the classical DTC using a single THB when flux droop occurs in a low-rotor-speed range. The proposed method can protect the DTC from flux droops at low speeds by reducing the duration of zero-voltage vectors and minimizing the number of reverse-voltage vectors. In addition, the proposed strategy is efficient in reducing torque and current ripples while operating at low motor speeds. Furthermore, a significant reduction in the switching frequency is obtained. The effectiveness of the proposed strategy is confirmed by simulation and experimental results.

Direct torque control, flux regulation, induction motor, low speed
2168-6777
1-10
Alsofyani, Ibrahim Mohd
81d9f0e1-df0a-4557-a747-e3dfee22b919
Kim, Keon Young
34f02376-5bad-4ae1-9516-a734226b6fb9
Lee, Sze Sing
47f36964-db27-4f5e-a4d3-4b0ba78ce29e
Lee, Kyo Beum
eed8c5c3-ed62-431d-8523-8c7b6411d159
Alsofyani, Ibrahim Mohd
81d9f0e1-df0a-4557-a747-e3dfee22b919
Kim, Keon Young
34f02376-5bad-4ae1-9516-a734226b6fb9
Lee, Sze Sing
47f36964-db27-4f5e-a4d3-4b0ba78ce29e
Lee, Kyo Beum
eed8c5c3-ed62-431d-8523-8c7b6411d159

Alsofyani, Ibrahim Mohd, Kim, Keon Young, Lee, Sze Sing and Lee, Kyo Beum (2019) A modified flux regulation method to minimize switching frequency and improve DTC-hysteresis-based induction machines in low-speed regions. IEEE Journal of Emerging and Selected Topics in Power Electronics, 1-10. (doi:10.1109/JESTPE.2019.2897064).

Record type: Article

Abstract

Direct torque control (DTC) suffers from flux droop owing to the long zero-voltage vectors at low motor speeds. Previous studies were able to attain flux regulation by imposing the continuous switching of forward and reverse active voltage vectors by causing torque overshoots in the torque hysteresis bands (THBs). This led to an excessive increase in the switching frequency and larger torque and current ripples, thus reducing the drive efficiency. In this paper, a modified flux regulation method is proposed for the classical DTC using a single THB when flux droop occurs in a low-rotor-speed range. The proposed method can protect the DTC from flux droops at low speeds by reducing the duration of zero-voltage vectors and minimizing the number of reverse-voltage vectors. In addition, the proposed strategy is efficient in reducing torque and current ripples while operating at low motor speeds. Furthermore, a significant reduction in the switching frequency is obtained. The effectiveness of the proposed strategy is confirmed by simulation and experimental results.

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More information

e-pub ahead of print date: 4 February 2019
Keywords: Direct torque control, flux regulation, induction motor, low speed

Identifiers

Local EPrints ID: 432585
URI: http://eprints.soton.ac.uk/id/eprint/432585
ISSN: 2168-6777
PURE UUID: 8f712b18-7ab3-482f-ba83-8d4844e4ac82
ORCID for Sze Sing Lee: ORCID iD orcid.org/0000-0003-2455-5783

Catalogue record

Date deposited: 19 Jul 2019 16:30
Last modified: 17 Dec 2019 01:23

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Contributors

Author: Ibrahim Mohd Alsofyani
Author: Keon Young Kim
Author: Sze Sing Lee ORCID iD
Author: Kyo Beum Lee

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