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COMMANDE NON LINEAIRE SANS CAPTEUR DE LA MACHINE ASYNCHRONE

Abstract : This work deals with the study of nonlinear control for Induction Motor (IM) without mechanical sensor. All of the proposed control laws in this work are validated on a significant benchmark considering the sensorless control problem of IM at low frequency. The trajectories of this benchmark are designed for realistic three cases with nominal value of the external load disturbance: at low speed, at high speed, and under conditions of unobservability (low frequencies). In the framework of sensorless observation of induction motor, the study of the observability without mechanical sensor is investigated. The result showed that the observability of induction motor cannot be established in the particular case when the stator frequency is set to zero and the rotor speed is constant (low frequencies). The design of observers is one of contribution of our work. First, interconnected high-gain observers are designed to estimate the mechanical and magnetic variables from the only stator current. Secondly, an adaptive interconnected is designed to estimate besides the mechanical and magnetic variable, the stator resistance, a critical parameter which affects controller performances at very low speed. The experimental results on the sensorless induction motor observer benchmark are given. These results show the robustness of the observers. A second major contribution of this work is the design of nonlinear controllers, the stability prove of the whole "Controller +Observer" and an experimental validation on a sensorless control benchmark. Four original controllers like Proportional Integral (PI) with non linear laws, first order sliding modes, high order sliding mode and backstepping controller are designed. The experimental results show that the two last control laws fulfil the benchmark objectives. Finally, a comparison with the industrial frequency converter on the sensorless control benchmark is given. We can conclude that an industrial frequency converter is unstable under unobservability conditions contrarily to our proposed control laws.
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Submitted on : Sunday, April 3, 2011 - 6:41:40 PM
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Dramane Traore. COMMANDE NON LINEAIRE SANS CAPTEUR DE LA MACHINE ASYNCHRONE. Automatique / Robotique. Ecole Centrale de Nantes (ECN), 2008. Français. ⟨tel-00582690⟩

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