Spacevector control of induction motors

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Supervisor:
Dr. Halász Sándor
Department of Electric Power Engineering

In my diploma work I have desired to examine the field orinted spacevector control of induction motors. As a first step I have overviewed in details the literature in relation with operation theory and control of induction motors. The mathematical model of the machine can be achieved on the basis of space vector differential equations, which describe the induction motors. I have achieved an induction machine model on the basis of these equations with the aid of MATLAB SIMULINK program. I have performed examinations on a model of a theoretical machine with the appropriate machine parameter values. I have determined the w-M characteristic of the machine, as well as I have examined its behaviour in different transient states.

Furthermore I have examined a specific case of field oriented spacevector control, the hysteresis current vector control. In this control the voltage inverter is directly controlled by the current control. After the creation of SIMULINK models of the blocks, which are necessary for the control, I have created the entire model of the control. The appropriate values of the control parameters have been set, than the behaviour of the controlled system has been examined via simulations.

After that the PWM control mode of the field orinted spacevector control has been examined. A PWM modulator has been applied as PWM controller. The control have been analysed by calculation units, which are using direct and indirect flux sensor as well. SIMULINK model of these blocks have been created, than the model of the entire controlled drive, and the examinations have been performed on this. The different control methods have been compared on the basis of the results of the simulations. As a summarization, it can be say, that there are no huge difference between the behaviour of each solutions, all of them posess good dynamics.

On the basis of the experiences of simulations, the PWM control with indirect flux sensor solution has been realized also in practice. For this the fix point SIMULINK model of the drive control unit has been created, from which a C language code has been generated, which has been compiled for a Texas microcontroller. Measurements have been performed on the created, controlled electric drive, and the received results have been compared with the simulations. It can be stated, that the received results have identical characteristic with the simulations.

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