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Today doubly fed induction generators (DFIG) are used for modern wind turbines to deliver electrical power to the grid. A speed variation of ±30% around synchronous speed can be obtained by the use of power converter of ±30% of nominal power. Furthermore, it is possible to control active and reactive power, which gives a better performance, and the power electronics enables the wind turbine to act as a more dynamic power source to the grid. The DFIG does not need either a soft starter or a reactive power compensator. This system is naturally a little bit more expensive compared to the classical systems; however, it is possible to save money on the safety margin of gear and reactive power compensation units, and it is also possible to capture more energy from the wind (Blaabjerg & Chen, 2006). A wind turbine with maximum power tracking is a very suitable power source to the grid. This new model, as a dynamic power source to the grid, comprises a maximum power tracking wind turbine, a doubly fed induction machine with winding configuration, external rotor resistance and external rotor source which has a variable phase and amplitude. In this chapter its simulation, effects of important parameters, design of a special kind of voltage controller and a new combined controller for it and comparison of these controllers are presented.

Wind Turbine Model and Maximum Power Tracking Strategy