Convergence analysis of back-EMF MRAS observers used in sensorless control of induction motor drives

This paper seeks to analyse stability and dynamics of back EMF MRAS based approach used in sensorless control of induction motors. Stability analysis is investigated to show unstable zones and it is explored using a state representation. A new rotor speed estimator is designed to achieve the stability in the various operating modes except for the inobservability line. The design of two Model Reference Adaptive System speed estimators is presented.Dynamic tracking performances of the MRAS based on rotor flux estimation are studied.Stability analysis of Back-EMF MRAS estimator is explored to find unstable regions.We propose a new adaptation law which allows reducing of unstable zones.Simulation results show effectiveness of the estimator with the new adaptation law.

[1]  Chul-Woo Park,et al.  Simple and robust speed sensorless vector control of induction motor using stator current based MRAC , 2004 .

[2]  Joachim Holtz,et al.  Methods for Speed Sensorless Control of AC Drives , 1996 .

[3]  H. Kubota,et al.  DSP-based speed adaptive flux observer of induction motor , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[4]  Mihai Comanescu,et al.  Sliding-mode MRAS speed estimators for sensorless vector control of induction Machine , 2006, IEEE Transactions on Industrial Electronics.

[5]  George C. Verghese,et al.  Observers for flux estimation in induction machines , 1988 .

[6]  E. Babaei,et al.  Verification of a new method for PI block design of MRAS-based sensorless speed estimators , 2011, 2011 International Conference on Electrical Machines and Systems.

[7]  Franck Morand.  Techniques d'observation sans capteur de vitesse en vue de la commande des machines asynchrones , 2005 .

[8]  Teresa Orlowska-Kowalska,et al.  Stator-Current-Based MRAS Estimator for a Wide Range Speed-Sensorless Induction-Motor Drive , 2010, IEEE Transactions on Industrial Electronics.

[9]  Teresa Orlowska-Kowalska,et al.  Sliding-mode direct torque control and sliding-mode observer with a magnetizing reactance estimator for the field-weakening of the induction motor drive , 2014, Math. Comput. Simul..

[10]  Seung-Ki Sul,et al.  Speed sensorless vector control of induction motor using extended Kalman filter , 1994 .

[11]  P. Vas,et al.  A stable MRAS-based sensorless vector control induction motor drive at low speeds , 2003, IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03..

[12]  Joachim Holtz,et al.  Sensorless control of induction motor drives , 2002, Proc. IEEE.

[13]  G. Yang,et al.  Adaptive speed identification scheme for vector controlled speed sensor-less inverter-induction motor drive , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[14]  Robert D. Lorenz,et al.  Comparison of saliency-based sensorless control techniques for AC machines , 2003 .

[15]  Dong-Seok Hyun,et al.  An improved stator flux estimation for speed sensorless stator flux orientation control of induction motors , 1998 .

[16]  Andrzej M. Trzynadlowski,et al.  A new scheme for sensorless induction motor control drives operating in low speed region , 2006, Math. Comput. Simul..

[17]  Yoichi Hori,et al.  Model Reference Adaptive Controller-Based Rotor Resistance and Speed Estimation Techniques for Vector Controlled Induction Motor Drive Utilizing Reactive Power , 2008, IEEE Transactions on Industrial Electronics.

[18]  A. F. Stronach,et al.  A stable back-EMF MRAS-based sensorless low-speed induction motor drive insensitive to stator resistance variation , 2004 .

[19]  Suman Maiti,et al.  A new instantaneous reactive power based MRAS for sensorless induction motor drive , 2010, Simul. Model. Pract. Theory.

[20]  Erik Etien,et al.  On the Stability of Full Adaptive Observer for Induction Motor in Regenerating Mode , 2010, IEEE Transactions on Industrial Electronics.

[21]  Peter Sergeant,et al.  A sensorless PMSM drive using modified high-frequency test pulse sequences for the purpose of a discrete-time current controller with fixed sampling frequency , 2010, Math. Comput. Simul..