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Direct torque and frequency control of double-inverter-fed slip-ring induction motor drive

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2 Author(s)
Poddar, G. ; Power Electron. Group, Electron. R&D Centre of India, Trivandrum, India ; Ranganathan, V.T.

A novel sensorless scheme for direct torque and frequency control of a double-inverter-fed slip-ring induction motor is presented. The analysis of a double-inverter-fed induction motor is given to derive the proposed controller. Various frequency profiles are analyzed for a direct frequency controller. A novel frequency profile is suggested to make the sensorless drive operation reliable and machine parameter independent at any rotor speed. Simulation and experimental results are presented from a 50-hp drive, demonstrating that the drive can deliver full torque from 0 to 2-p.u. speed in either direction. Thus, double the rated power can be extracted from the motor without overloading it.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:51 ,  Issue: 6 )