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Linear parameter varying induction motor control with two-degree-of freedom controller

This paper proposes a self-scheduled control method for the induction motor. We design a controller with two degree of freedom for the induction motor using the linear matrix inequality (LMI) based approach to linear parameter varying (LPV) systems which takes into account the nonlinear dynamics of the system We propose a two hierarchical control structure. The inner-loop current controller which considers the mechanical speed, rotor resistance, and rotor current frequency as a variable parameter achieves robust tracking of the stator current reference signal. The outer loop mechanical speed controller aims to ensure reference speed tracking. In simulation the controller has been tested, stability and high performances have been achieved over the entire operating range of the induction motor.