Direct Torque Control of Five Phase Induction Motor Using Space Vector Modulation

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Addis Ababa University


this thesis effective direct torque control for a five phase induction motor with concentrated windings is designed. For demonstrating the superior performance of the five-phase IM, the motors are analyzed on the d1-q1 and d3-q3 synchronously rotating reference frame. The five-phase VSI output are decoupled into the torque producing (fundamental) and non-torque producing (third) harmonics sets. The third harmonic components can be used to enhance the total torque production and the motor needs to be supplied with the fundamental and the third harmonic of the stator voltages. The fault tolerance simulation results are analyzed. Also the difference between three-phase induction motor and five-phase induction motor is highlighted. Thus due to the additional degrees of freedom, the five-phase motor drives possess many other advantages when compared to traditional three-phase motor drives. Some of these advantages include, lower torque pulsation, reduction in harmonic currents, reduced stator current per phase without the need to increase the phase voltage, greater reliability, fault tolerant feature and increased power. The performance of direct torque control induction motor has been demonstrated by simulation using a matlab/simulik. By the proper dynamical adjustment and steady state compensation, the direct torque control of the five-phase induction motor achieves a high drive performance. Simulation output results show that the transient response oscillates for 0.03 second with rise time 0.004 second and the steady state value of torque is tracking the load torque with less than 2% error. Keywords: Induction Motor, Direct Torque Control, d-q Transformation, Space Vector Modulation.



Induction Motor; Direct Torque Control; d-q Transformation; Space Vector Modulation