DTC of Twelve Sector IM Drive Using Four Level Hysteresis Control to Reduce Torque Ripple Comparing with Conventional Control
نویسندگان
چکیده
In recent years, the areas of industrial application of AC drives, especially Induction machine based on DTC technique has gradually increased due to its advantages over the other techniques of control. In conventional direct torque control, the selection of flux linkage & electromagnetic torque errors are made within the respective flux and torque hysteresis bands in order to obtain fast torque response, low inverter switching frequency and low harmonic losses. However conventional DTC suffers from high torque ripple and variable switching frequency. This paper, propose a method to reduce torque fluctuations, where the circular flux vector is divided into twelve sectors and is compared with conventional DTC method where the flux vector is divided into six. The twelve sectors DTC method is simulated by using MATLAB/simulink package which represent the reduction of torque
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