Modelling and simulation of doubly-fed induction wind power system based on Matlab/Simulink

Doubly-fed induction generator (DFIG) has become the most widely applied wind turbine in variable speed constant frequency (VSCF) wind power generation, since it presents many advantages such as variable speed running, the decoupled control of active and reactive power, and the small rotate difference power. Targeting the doubly-fed wind power system, this paper establishes the overall mathematical model composed of wind turbine, drive system, double-fed induction generator, stator flux orientation vector control tactics, maximum power point tracking tactics. Based on the mathematical model mentioned above, the paper writes the S-Function procedures of the different wind circumstances with Matlab/Simulink to set up a double-fed wind power system simulation model. And also taking two step-up wind speeds as examples, simulation studies are made on the dynamic characteristics of the model with the grid connected. The simulation studies show that the model realizes the maximum power point tracking and decoupling control of power, and the double-fed wind power system has satisfactory dynamic characteristics, thus proving that the model established is correct and valid.