Decoupling control of induction motors based on nonlinear optimal predictive control

Induction motor speeding system is a typical nonlinear system with strong coupling. This paper designs a close-form nonlinear predictive decoupling controller based on nonlinear optimal predictive control theory and implements dynamic decoupling of rotor speed and flux. Because of the implementation of control law no needing on line optimization and the tuning parameter of the controller only two, it is convenient for engineering implementation and test. Moreover, taking into considering the effect of voltage source inverter on decoupling control, a voltage anti-windup method is presented to conquer the problem of voltage limit destroying dynamic decoupling performance by dynamic compensation. Simulation results show this controller behaves satisfactory dynamic decoupling performance.