Direct Torque Control With Feedback Linearization for Induction Motor Drives

This paper describes a direct-torque-controlled (DTC) induction motor (IM) drive that employs feedback linearization and sliding-mode control (SMC). A new feedback linearization approach is proposed, which yields a decoupled linear IM model with two state variables: torque and stator flux magnitude....

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Bibliographic Details
Published in:IEEE transactions on power electronics 2017-03, Vol.32 (3), p.2072-2080
Main Authors: Lascu, Cristian, Jafarzadeh, Saeed, Fadali, M. Sami, Blaabjerg, Frede
Format: Article
Language:English
Subjects:
Adjustable speed drives
Computer simulation
Control stability
Control systems design
Controllers
direct torque control (DTC)
Feedback linearization
Flux
induction motor (IM) drives
Induction motors
Mathematical model
Nonlinear systems
Proportional control
Robust control
Robustness
Rotors
Sliding mode control
sliding-mode control (SMC)
Stability analysis
State variable
Stators
Time response
Torque
Torque control
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Summary:This paper describes a direct-torque-controlled (DTC) induction motor (IM) drive that employs feedback linearization and sliding-mode control (SMC). A new feedback linearization approach is proposed, which yields a decoupled linear IM model with two state variables: torque and stator flux magnitude. This intuitive linear model is used to implement a DTC-type controller that preserves all DTC advantages and eliminates its main drawback, the flux and torque ripple. Robust, fast, and ripple-free control is achieved by using SMC with proportional control in the vicinity of the sliding surface. SMC assures robustness as in DTC, while the proportional component eliminates the torque and flux ripple. The torque time response is similar to conventional DTC and the proposed solution is flexible and highly tunable due to the P component. The controller design is presented, and its robust stability is analyzed in simulations. The sliding controller is compared with a linear DTC scheme with and without feedback linearization. Extensive experimental results for a sensorless IM drive validate the proposed solution.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2016.2564943