NONLINEAR FEEDBACK CONTROL AND TORQUE OPTIMIZATION OF A DOUBLY FED INDUCTION MOTOR

Saïd Drid - Mohamed Tadjine - Mohamed-Said Naït-Saïd

   In this paper, the authors propose a new vector control intended for doubly fed induction motor (DFIM) mode. The use of the state-all-flux induction machine model with a fluxes orientation constraint gives place to a simpler control model. Since the double flux orientation creates an orthogonally between the stator and rotor fluxes, it results a linear and decoupled machine control giving an optimal developed torque. The nonlinear feedback control purpose is employed and where the global asymptotic control stability is proven using the Lyapunov function. The present DFIM-control is achieved by means of armature fluxes, so the machine saturation should be mostly solicited. Consequently, a new torque-optimization- factor (TOF) will be proposed in this work.

Keywords: double fed induction machine, wound rotor, vector control, flux orientation, Lyapunov function, torque-optimization-factor (TOF), energy saving

[full-paper]