Abstract
| The paper deals with techniques which use the predictive concepts in order to obtain both the pulse width modulation strategy of a voltage fed inverter and the predictive control of the induction motor drive. Concerning the PWM technique, it is applied for the case when the inverter supplies an induction motor, the reference values of the currents being obtained from a classical vector control scheme. The described technique is then simulated and the waveforms are compared with ones obtained with preset currents (bang-bang) pulse width modulation, as the behavior of the two strategies is similar. The results are also compared with the ones resulted when a classical DTC controls the induction motor, as the both determine, during each sampling period, the next stator voltage phasor, but considering different criteria. Concerning the control of the drive, the vector control and the predictive control of the induction motor are compared. For the vector control, the rotor flux oriented one is pointed out, with highlight on the voltage source inverter type. A simple (and practical) method for avoiding the influences of the stator resistance variations when a voltage source inverter is used is presented, based on proper simulation models. For the predictive control of the induction motor, a sensorless diagram is considered. Finally, further actions are proposed for the work continuation. |
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