Title :
Direct torque control of induction motor with extended Kalman filter
Author :
A, Dinesh Pai ; Umanand, L. ; Rao, N.J.
Author_Institution :
Centre for Electron. Design & Technol., Indian Inst. of Sci., Bangalore, India
Abstract :
Induction motor speed control is an area of research that has been in prominence for some time now. Recent advances in this field have made it possible to replace the DC motor by induction machines, even in applications that demand a fast dynamic response. Many industrial applications demand high performance speed sensorless operation due to various reasons. Direct torque control (DTC) of induction motors is a popular method because of the resulting fast dynamic response of the motor, lower sensitivity to motor parameter variations and relatively low switching harmonics in the inverter. However, the present DTC approach is unsuitable for high-performance applications, especially at very low speeds, because of the need of a speed sensor for increased accuracy, system and measurement noises, and absence of any error decay mechanism. In this paper, an extended Kalman filter (EKF) is designed for stator flux and speed estimation. Estimated values along with other measured states are used for the closed loop speed sensorless control operation of the induction motor. At low speeds, where noise is predominant, performance is improved due to the filtering action of the EKF. Simulations are performed and the results discussed
Keywords :
DC-AC power convertors; Kalman filters; control system analysis; control system synthesis; dynamic response; induction motors; invertors; machine theory; machine vector control; parameter estimation; stators; torque control; velocity control; closed loop speed sensorless control; control design; control simulation; direct torque control; extended Kalman filter; fast dynamic response; induction motor; invertor switching harmonics; parameter variations sensitivity; stator flux estimation; stator speed estimation; DC motors; Induction machines; Induction motors; Inverters; Kalman filters; Power harmonic filters; Sensor systems and applications; Torque control; Velocity control; Velocity measurement;
Conference_Titel :
Power Electronics and Motion Control Conference, 2000. Proceedings. IPEMC 2000. The Third International
Conference_Location :
Beijing
Print_ISBN :
7-80003-464-X
DOI :
10.1109/IPEMC.2000.885344