Patent Document ID: 20140306451
Application ID: 13862327
Patent Flag: 0

Claim One:
1. An adaptive pitch control system for a wind generator, the wind generator being a doubly fed induction generator (DFIG) having blade pitch servos for adjusting blade pitch of the DFIG wind generator, the system comprising: means for determining a theoretically maximum reference power of the wind generator based on rotor speed and a plurality of given pitch angles; a proportional-integral (PI) pitch controller having an input, a proportional gain constant K P , an integral gain constant K I , and an output adapted for connection to the blade pitch servos, the PI pitch controller output including means for sending pitch angle commands β to the blade pitch servos to control pitch angle of the blades; means for feeding back system states of the wind generator to said PI pitch controller; means for determining actual power output of the wind generator; means for determining the difference between the actual power output of the wind generator and the theoretically maximum reference power, the difference resulting in an error power signal; means for applying said error power signal to the PI pitch controller input; means for additively combining the K P multiplied by the error power signal with the K I multiplied by a time integral of the error power signal, the additive combination means forming the PI pitch controller output of the pitch angle commands β; and means for adaptively adjusting the K P and the K I based on the error power signal.