Abstract This paper deals with the stability problem of three stator current error-based estimators of induction motor speed, especially in the regenerating operation mode. The stability of the adaptive full-order observer (AFO) and two model reference adaptive systems (MRASs) based on a stator current error ($ MRAS^{CC} $and $ MRAS^{CV} $) is briefly analysed, and the stability borders are determined and compared. It is shown that $ MRAS^{CV} $speed estimator is stable in the whole operation range including the regenerating mode without any modifications. The stability enhancement method for AFO and $ MRAS^{CC} $estimators is described, and the solution for their stability improvement is proposed. Torque-speed characteristics of the analysed MRAStype estimators in a wide range of drive speed and load torque changes are given, as well as the behaviour of estimators during transients is compared. The theoretical analysis and simulation test results are validated by experimental tests.


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    Title :

    Comparative Stability Analysis of Stator Current Error-based Estimators of Induction Motor Speed


    Contributors:

    Published in:

    Publication date :

    2018




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English


    Classification :

    BKL:    53.35 Stromrichter, Transformatoren / 53.33$jElektrische Maschinen und Antriebe / 53.33 Elektrische Maschinen und Antriebe / 53.35$jStromrichter$jTransformatoren