Simulation of High Power Electric Dynamometer using Fuzzy Direct Torque Control for Induction Motors
In this paper, a new method for controlling electric dynamometer, based on fuzzy control technique, is presented. Due to the advantages of squirrel cage induction motors, including simple structure, good reliability, and low maintenance cost, these motors are suitable for use as dynamometer, to provide dynamic load for torque-speed or speed-power curve characteristics. In order to obtain better torque control performance and induction motor speed, Direct Torque Control (DTC) method is implemented based on the Space Vector Modulation (SVM) technique with fuzzy method. The fuzzy method is used instead of PI or hysteresis torque and flux comparators. For the dynamometer simulation, a 200-horsepower squirrel cage induction motor is connected to a 200-hp direct current motor via the shaft model. The performance of the proposed dynamometer system was simulated in three study modes for each of the hysteresis direct torque control, PI torque control, and fuzzy direct torque control approaches using MATLAB/SIMULINK software. The simulation results showed a significant effect of the fuzzy method on reducing the response speed fluctuation and reducing the torque ripple. The results showed that it is feasible to use a high-power motor in an electric dynamometer application.
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