Robust nonlinear integral backstepping of speed and rotor flux control design for a wound rotor induction motor model with uncertain parameters

Magnetic flux saturation and variation of the temperature during the operation of the motor causes a variation of inductive and resistive stator and rotor parameters. This article deals with these disturbances by backstepping technique with two Actions full. The first integral action applied to the speed and torque control aims to reinforce the robustness of the controller in the face of varying parameters. Second integral action is to reinforce the robustness of the control flow and the stator currents and rotor facing the parameter variation. The control technique is applied from a new model in the reference frame (α/β) whose state variables are constant in steady state unlike the conventional model. The performance of the control system is tested in a simulation in the Matlab/Simulink environment. The results show good transient performance and good tracking of the speed and rotor flux references. There has also been a good rejection of interference, due to variations load torque, of the reference of the rotor flux, mutual inductance and the rotor resistance.