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A Current Source Inverter Fed Induction Motor Drive with Power Factor Angle Control Using Microprocessor

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3 Author(s)
Sujit K. Biswas ; Department of Electrical Engineering, Indian Institute of Science, Bangalore 560012, India. ; S. Sathiakumar ; Joseph Vithayathil

This paper describes a method of adjusting the stator power factor angle for the control of an induction motor fed from a current source inverter (CSI) based on the concept of space vectors (or park vectors). It is shown that under steady state, if the torque angle is kept constant over the entire operating range, it has the advantage of keeping the slip frequency constant. This can be utilized to dispose of the speed feedback and simplify the control scheme for the drive, such that the stator voltage integral zero crossings alone can be used as a feedback for deciding the triggering instants of the CSI thyristors under stable operation of the system. A closed-loop control strategy is developed for the drive based on this principle, using a microprocessor-based control system and is implemented on a laboratory prototype CSI fed induction motor drive.

Published in:

IEEE Transactions on Industrial Electronics  (Volume:IE-34 ,  Issue: 4 )