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Sensorless field-oriented control for double-inverter-fed wound-rotor induction motor drive

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2 Author(s)
Poddar, G. ; Dept. of Electr. Eng., Indian Inst. of Technol., Kharagpur, India ; Ranganathan, V.T.

A novel control technique for sensorless vector control operation of a double-inverter-fed wound-rotor induction motor is presented. Two current controllers control the stator-side currents based on a vector control algorithm. Another V/f-type flux and frequency controller controls the rotor-side frequency directly. A novel frequency command profile for the rotor-side controller is suggested to make this sensorless drive operation reliable and reduce dependence on motor parameters at any rotor speed. A complete inverter power flow analysis is presented to show that the drive can deliver full torque from 0- to 2-p.u. speed for either direction of rotation. Thus, double the rated power can be extracted from the induction motor without overloading it. The proposed algorithm allows the drive to start on-the-fly without any rotor transducer. Results from a prototype 50-hp drive are presented.

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Industrial Electronics, IEEE Transactions on  (Volume:51 ,  Issue: 5 )