Instantaneous Electric Power as a Tool for Control of Induction Motors - A Pilot Study
AdvisorTrzynadlowski, Andrzej M.
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The thesis is devoted to the concept of direct power control as a tool for control of induction motors. Power distribution in the induction motor is analyzed using both the exact and simplified models of the motor. An improved sensorless Instantaneous Power Control (IPC) technique based on the known IPC method is also proposed. Computer simulations are presented for confirmation of the theoretical conclusions.Following power analysis of a simplified model of the induction motor, it is shown that the motor torque can be controlled by adjusting the input active power. The magnetic flux can be controlled by adjusting the stator current by selecting a suitable voltage space vector at the beginning of each switching interval. We named that idea as Direct Power Control (DPC), it may facilitate development of novel control methods of induction motor in future studies.It has also has been found that the IPC requires that the magnetic flux be generated first employing the direct torque control (DTC). Except for this limitation, the novel sensorless IPC displays a good dynamic response.