Dynamic Performance of a Matrix Converter Fed Speed Sensorless DTC Induction Motor Drive Using Adaptive Speed Observer

Abstract

In this paper, a closed loop adaptive speed observer is proposed to improve the dynamic performance of a matrix converter (MC) fed stator flux oriented DTC induction motor drive. The speed observer uses estimated rotor fluxes to estimate the rotor speed. The advantages of using a full order Luenberger observer instead of a reduced order closed loop model with the proposed speed observer, for the estimation of the flux linkages, are demonstrated using experiments. Finally, the performance of the proposed observer is compared with a full order Luenberger observer that uses error between estimated and sensed stator dqaxes currents for estimating the rotor speed. The superior dynamic performance of the proposed observer during sudden speed reversal command is demonstrated with experiments on a 3HP induction motor.