Reference Speed Optimizer Controller for Maximum Power Tracking in Wind Energy Conversion System Involving DFIG

The purpose of this paper is to introduce the modelling and control strategy of the wind energy conversion system (WECS), based on double fed induction generator (DFIG) connected with AC/DC/AC converters. The proposed strategy involves a multi-loop non-linear controller, designed in order to obtain two main control objectives: speed reference optimization, designed to extract a maximum wind energy whatever the wind speed and power factor correction (PFC) requirement must be satisfactorily realized. The whole non-linear model is presented in d-q reference frame, within it the multi-loop non-linear controller is synthesized using the backstepping design technique. A formal analysis based on Lyapunov stability is carried out to exhibit the control system performances. The latter is validated through simulation using software Matlab/Simulink and studies on a 1.5 kw DFIG wind generation system. The simulation results show that the whole control objectives are asymptotically achieved.