Patent ID: 7880321

Claim:
A wind power generator system comprising: a windmill rotor including a blade whose pitch angle is variable; a generator driven by said windmill rotor; and a control unit controlling output power of said generator and said pitch angle of said blade in response to a rotational speed of said windmill rotor or said generator, wherein said control unit performs a first control in which said output power is controlled in accordance with a predetermined power-rotational speed curve until said rotational speed is increased to reach a predetermined rated rotational speed, and performs a second control in which said output power is controlled to a predetermined rated power when said rotational speed exceeds said rated rotational speed, wherein said control unit is responsive to said pitch angle for maintaining a state of performing said second control or for switching to a state of performing said first control, when said rotational speed is reduced below said rated rotational speed after said control unit is once set to the state of performing said second control, and wherein as a result of said control unit being responsive to said pitch angle, fluctuation in said output power is suppressed when said generator rotational speed falls below said rated rotational speed for a short time.