Title :
Improved sensorless EKF-based direct torque control at low speed with constant switching frequency controller
Author :
Alsofyani, I.M. ; Idris, N.R.N.
Author_Institution :
UTM-PROTON Future Drive Lab., Univ. Teknol. Malaysia, Skudai, Malaysia
fDate :
Sept. 28 2014-Oct. 1 2014
Abstract :
A sensorless extended Kalman filter (EKF) based direct torque control (DTC) with a constant switching frequency control (CSFC) of induction motor is proposed in this research work. By replacing the conventional 3-level hysteresis controller with a CSFC, the weakening of the stator flux at low speed is avoided and the flux regulation is improved; consequently the estimated speed at low speed is also improved. In this paper, the performance comparison between the conventional hysteresis comparator-based DTC drive (DTC-Hys) and a CSFC-based DTC (DTC-CSFC) is performed experimentally. It is shown that significant improvement in the estimated speed and drive performance at low speed is achieved with the DTC-CSFC.
Keywords :
Kalman filters; angular velocity control; frequency control; hysteresis motors; induction motors; nonlinear filters; sensorless machine control; torque control; 3-level hysteresis controller; CSFC; DTC; constant switching frequency controller; extended Kalman filter; flux regulation; hysteresis comparator; improved sensorless EKF-based direct torque control; induction motor; stator flux weakening; Estimation; Hysteresis; Rotors; Stators; Torque; Torque control; Vectors; AC motor drives; EKF; direct torque control; speed sensorless;
Conference_Titel :
Power Engineering Conference (AUPEC), 2014 Australasian Universities
Conference_Location :
Perth, WA
DOI :
10.1109/AUPEC.2014.6966521
