Title :
Stator resistance tuning in a stator-flux field-oriented drive using an instantaneous hybrid flux estimator
Author :
Habetler, Thomas G. ; Profumo, Francesco ; Griva, Giovanni ; Pastorelli, Michele ; Bettini, Alberto
Author_Institution :
Sch. of Electr. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
fDate :
1/1/1998 12:00:00 AM
Abstract :
A self-tuning control scheme for stator-flux field-oriented induction machine drives in electric vehicles operating over a wide speed range is discussed in this paper. The stator flux can be determined accurately from the terminal voltage when the machine is operating at high speed. However, at low speed, the stator resistance must be known to calculate the stator flux. The problem of calculating the stator flux accurately over the entire speed range is addressed. The rotor flux can be found from the machine speed and rotor time constant. The stator flux, at low speed, is then calculated directly from the rotor flux. By alternating between these two methods of determining the stator flux, a self-tuning operation is achieved, wherein the stator and rotor resistances are periodically updated. Since both methods of determining the stator flux are forced to track one another, a smooth transition between flux estimators is obtained. The torque and flux are then controlled in a deadbeat fashion. Good torque control over a wide speed range can therefore be obtained. With the proposed scheme, the advantages of direct torque control are obtained over the entire speed range with the addition of a speed sensor
Keywords :
electric resistance; electric vehicles; induction motor drives; machine control; magnetic flux; magnetic variables control; parameter estimation; rotors; self-adjusting systems; stators; torque control; deadbeat control; electric vehicles; flux control; instantaneous hybrid flux estimator; machine speed; rotor flux; rotor time constant; self-tuning control; stator resistance tuning; stator-flux field-oriented drive; terminal voltage; torque control; Drives; Electric resistance; Hybrid electric vehicles; Inductance; Induction machines; Rotors; Stators; Torque control; Traction motors; Tuning;
Journal_Title :
Power Electronics, IEEE Transactions on