Title :
Nonlinear decoupling control strategy for variable frequency induction motor system fed by hysteresis-band current-controlled PWM inverter
Author :
Chen, B. ; Ruan, Y. ; Xu, Y. ; Gong, S.
Author_Institution :
Shanghai Univ. of Technol., China
Abstract :
The dynamic model of induction motor fed by hysteresis-band current-controlled PWM inverter is a nonlinear multivariable system with strong coupling. The theory of feedback linearization for nonlinear systems is applied to realize linearization and decoupling of this control object with consideration of the time delay of the hysteresis band. As a result, two linear subsystems-rotor speed subsystem and rotor flux linkage subsystem are obtained. The regulators of these two linear subsystems can be easily designed by ordinary method based on linear theory. An AC variable frequency speed-regulating system is formed with the nonlinear decoupling algorithm incorporated in a 8096 single-chip microcomputer. Finally, experimental results show that the dynamic behaviour of this system is excellent
Keywords :
electric current control; feedback; induction motors; invertors; machine control; microcomputer applications; multivariable control systems; nonlinear control systems; power engineering computing; pulse width modulation; rotors; 8096 single-chip microcomputer; decoupling control strategy; dynamic model; feedback linearization; hysteresis-band current-controlled PWM inverter; linearization; nonlinear multivariable system; regulators; rotor flux linkage subsystem; rotor speed subsystem; speed-regulating system; variable frequency induction motor system;
Conference_Titel :
Power Electronics and Applications, 1993., Fifth European Conference on
Conference_Location :
Brighton
