Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 59, Issue 11, Pages 4197-4206Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2011.2178209
Keywords
Extended Kalman filter; induction motors (IMs); load torque estimation; rotor and stator resistance estimation; sensorless control
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Funding
- Scientific and Technical Research Council of Turkey (Turkiye Bilimsel ve Teknolojik Arastirma Kurumu-TUBITAK) [EEEAG-108E187]
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This paper presents the real-time implementation of a bi input-extended Kalman filter (EKF) (BI-EKF)-based estimator in order to overcome the simultaneous estimation problem of the variations in stator resistance R-s and rotor resistance R-r' aside from the load torque t(L) and all states required for the speed-sensorless control of induction motors (IMs) in the wide speed range. BI-EKF algorithm consists of a single EKF algorithm using consecutively two inputs based on two extended IM models developed for the simultaneous estimation of R-r' and R-s. Therefore, from the point of real-time implementation, it requires less memory than previous EKF-based studies exploiting two separate EKF algorithms for the same aim. By using the measured stator phase voltages and currents, the developed estimation algorithm is tested with real-time experiments under challenging variations of R-s, R-r', and t(L) in a wide speed range; the results obtained from BI-EKF reveal significant improvement in the all estimated states and parameters when compared with those of the single EKFs estimating only R-r' or R-s.
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