Performance of Wind Energy Conversion System Using a Doubly Fed Induction Generator for Maximum Power Point Tracking

This paper deals with the analysis, modeling, and control of a doubly-fed induction generator (DFIG) driven by the wind turbine. A control technique is presented for extracting the maximum power from the wind turbine. The wind energy conversion system (WECS) is equipped with a DFIG and two back-to-back connected voltage source converters (VSCs) in the rotor circuit. The proposed control technique is based on using the grid-side converter to regulate the dc link voltage constant. The task of the rotor side converter is to track the maximum power point for the wind turbine and to maintain unity power factor at stator terminals. The description for the proposed system is presented with the detailed dynamic modeling equations. Simulation results for different operating conditions are demonstrated to reveal the performance of the proposed technique. Corresponding simulation results under unity power factor operating conditions are presented to demonstrate the effectiveness of the control technique. Finally, the energy captured by two generators, a DFIG and a squirrel cage induction generator (SCIG) is presented for a place Jakhau (Gujarat) in India, which is estimated on the basis of the wind speed variation over a day.