DISCRETE SWITCHING STRATEGY FOR DIRECT TORQUE CONTROL OF INDUCTION MOTOR USING ADAPTIVE PULSE WIDTH MODULATOR

Abstract

The Direct Torque Control on Space Vector Modulator of Induction motor is modeled to reduce the torque ripples. The conventional approaches are used various controlling strategies for determining the performance of motor drive system. Here the controlling section mainly utilized with switching activity of the device. Here the proposed model is designed to rectify the problem of overcoming the modulation at high speed Induction motor. In proposed DTC of Induction Motor, designed with discrete switching activity by generating the gated pulse from PWM and it is modeled based on the Space Vector Modulator. The discrete switching activity is performed with referring peak voltage and offset voltage with initial state of zero. By adding these voltages, the vector voltage is generated to occupy the SVM - Induction machine; therefore, this reduces the torque ripples and harmonic signals. Here the adaptive pulse width modulator generates the pulse by controlling the torque and flux ripples using PI controller. The experimental result shows the 4.3% reduction of torque ripples and 0.7% reduction of flux ripples. This makes the discrete clock switching for performing the Induction motor. The closed loop flux controlling strategy is enabled to perform best result of rated speed, torque and stator flux. By analyzing various conventional methods, the proposed model utilized to obtain better result. The overall design is done with the help of MATLAB/2018a tool.