A Very-Low-Speed Sensorless Control Induction Motor Drive with Online Rotor Resistance Tuning by Using MRAS Scheme
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Laboratory of Sciences and Techniques of Automatic control & computer engineering (Lab-STA),
Laboratoire des Sciences de l'Information et des Systèmes (LSIS) Address: UMR CNRS 7296 - Ecole Centrale de Marseille (ECM). France
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Laboratory of Sciences and Techniques of Automatic control & computer engineering (Lab-STA),, National School of Engineering of Sfax, University of Sfax. Postal Box 1173, 3038 Sfax, Tunisia., 3038 sfax, Tunisia
Power Electronics and Drives 2019;4 (39):125-140
In this paper, a sensorless indirect stator flux oriented control (ISFOC) induction Motor drive at very low frequencies is presented. The Model Reference Adaptive System (MRAS) scheme is used to estimate Simultaneously the speed and the rotor resistance. However, the error between the reference and the adjustable models, which is developed in the stationary stator reference frame, is used to drive a suitable adaptation mechanism that generates the estimate speed and the rotor resistance from the stator voltage and the machine current measurement. The stator flux components in the stationary reference frame are estimated through the integration of the back EMF of the machine. This method, however, has an error accumulation problem especially when integrating at low speed. To overcome a strategy based on the stator flux synthesis through programmable cascaded low-pass filters (PCLPF) was studied. The stability analysis method of the MRAS estimator is studied in order to show the robustness of the rotor resistance variations. Moreover, this paper is ended up with an experimental results which, in turn, show the robustness of the proposed scheme for the sensorless ISFOC induction motor drive
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