ENHANCEMENT IN STEADY STATE AND DYNAMIC PERFORMANCE OF DIRECT TORQUE CONTROL INDUCTION MOTOR DRIVE

Bhoopendra Singh – Shailendra Jain – Sanjeet Dwivedi

   An enhancement in dynamic performance of a traditional DTC drive can be achieved by a robust speed control algorithm while the steady state performance depends upon the switching strategy selected for minimization of torque ripples and an efficient flux control loop. In this paper a new torque ripple reduction technique with a modified look up table incorporating a larger number of synthesized non zero active voltage vectors is utilized to overcome the limitations of the conventionally controlled DTC drive. A fuzzy logic based speed controller and a low pass filter with tunable cutoff frequency for flux estimation is proposed in this paper. The proposed study is investigated through simulation and experimentally validated on a test drive.

Keywords: direct torque control (DTC), induction motor, torque ripple minimisation, modified low pass filter, fuzzy logic

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