EFFECTS OF LOAD AND SPEED VARIATIONS IN A MODIFIED CLOSED LOOP V/F INDUCTION MOTOR DRIVE
DOI:
https://doi.org/10.4314/njt.313.565Keywords:
induction motor, stationary reference frame, Volts/Hertz control, reference speed, load torqueAbstract
This paper investigates the effects of load and reference speed variations in a modified closed loop v/f induction motor drive. A modified approach, involving the addition of a low frequency boost voltage, is developed and adopted as an enhancement to the conventional closed loop speed control of a three phase squirrel cage induction motor modelled in the stationary qd reference frame using six-step voltage source inverter waveform. The results obtained show a superior dynamic and steady state performance in the two basic mechanical characteristics: motor speed and electromechanical torque under load variation. The performance of this scheme is simulated in MATLAB/SIMULINK.
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