Paper Details: Downloads: 537
Serial Number: P1110708002
Title: An MRAS - Based Adaptative Full Order Luenberger Observer for Sensorless DRFOC of IM Drives - Performances and Stability analysis
Authors: Sbita Lassaâd and Ben Hamed Mouna
Abstract: A new method for the implementation of a sensorless direct flux oriented control of induction motor drives is proposed in this paper. As the induction motor is decoupled if the direct rotor flux is maintained constant and equal to the nominal flux value and the reverse rotor flux is to be fixed at zero value. It is well known that the rotor flux of the induction motor is unmeasured. To cope with this problem and the drawbacks of the sensors, a combination of two observers is used: a full order Luenberger observer to estimate the rotor flux and a model reference adaptative system (MRAS) observer for rotor speed estimation. With the help of the observed (d, q) axis components of the rotor flux, the direct rotor field orientation vector control is implemented. We show by an extensive simulation study that the proposed method for DRFOC is completely satisfactory at low speed region and in field weakening region (high speeds). It is not sensitive to disturbances and parameters mismatch. Observers and control scheme are robust to changes in load torque. The method proposed achieves good performances with an optimal and adaptative gain tuning matrix obtained from the Linear Quadratic Regulator (LQR) design principle. Digital simulation results are presented to show the improvements in performance of the proposed method and the global stability of the MRAS based speed sensorless combined to flux observer scheme with the LQR matrix gain.
Keywords: Induction motor, Direct rotor field oriented control, Luenberger Observer, MRAS and speed sensorless.
Journal/Conference: International Journal of Automatic Control and System Engineering
Volume: 7
Issue: 1
Submission Date: 2/1/2007 12:00:00 AM
Review Date: 3/1/2007 12:00:00 AM
Publishing Date: 5/1/2007 12:00:00 AM
Article Downloads: 537
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