Aerodynamic power control of wind turbine using fuzzy logic

This paper considers pitch control using a fuzzy logic and dc bus electrical power control in variable speed wind turbines. The system is equipped with a PMSG (Permanent Magnet Synchronous Generator) connected to the grid through back to back power converter. Variable speed wind turbines have the capability to deliver more power than the fixed speed ones, but this power may exceed the required power which will be delivered to the grid. The work is focused on the management of this excess power by using fuzzy logic controller. The aerodynamic power is limited through pitch angle control and the power on the dc bus voltage through power converter control. Comparisons between fuzzy logic and conventional controllers have been made. Satisfying results in term of pitch angle, dc bus voltage and grid power have been obtained. The whole system has been simulated using MATLAB/SIMULINK® software for ramping, step and real wind speed conditions.