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Flux-torque cross-coupling analysis of FOC schemes: Novel perturbation rejection characteristics

Amezquita-Brooks, Luis, Liceaga-Castro, Eduardo, Liceaga-Castro, Jesus and Ugalde Loo, Carlos Ernesto 2015. Flux-torque cross-coupling analysis of FOC schemes: Novel perturbation rejection characteristics. ISA Transactions 58 , pp. 446-461. 10.1016/j.isatra.2015.05.004

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Field oriented control (FOC) is one of the most successful control schemes for electrical machines. In this article new properties of FOC schemes for induction motors (IMs) are revealed by studying the cross-coupling of the flux-torque subsystem. Through the use of frequency-based multivariable tools, it is shown that FOC has intrinsic stator currents disturbance rejection properties due to the existence of a transmission zero in the flux-torque subsystem. These properties can be exploited in order to select appropriate feedback loop configurations. One of the major drawbacks of FOC schemes is their high sensitivity to slip angular velocity perturbations. These perturbations are related to variations of the rotor time constant, which are known to be problematic for IM control. In this regard, the effect that slip angular velocity perturbations have over the newly found perturbation rejection properties is also studied. In particular, although perturbation rejection is maintained, deviations to the equilibrium point are induced; this introduces difficulties for simultaneous flux and torque control. The existence of equilibrium point issues when flux and torque are simultaneously controlled is documented for the first time in this article.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: Flux-torque cross-coupling; Induction motor; Field oriented control; Multivariable systems
Additional Information: Available online 15 July 2015
Publisher: Elsevier
ISSN: 0019-0578
Funders: Engineering and Physical Sciences Research Council
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 12 May 2015
Last Modified: 11 Mar 2019 12:11

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