Patent ID: 7952215

Claim:
A wind turbine generator system comprising: an anemometer and an anemoscope provided on a nacelle a yaw-angle controlling mechanism configured to control the orientation of the nacelle a data accumulation unit configured to sequentially accumulate data sets of a generated output power during operation of the wind turbine generator system, an incoming wind speed estimated on the basis of a wind speed measured at the anemometer, and a wind direction deviation, which is the difference between a wind direction measured at the anemoscope and the orientation of the nacelle; an analyzing unit configured to carry out statistical analysis of the data accumulated by the data accumulation unit, to determine a distribution curve corresponding to the wind direction deviation of the generated output power at each incoming wind speed, to set the wind direction deviation corresponding to the peak of the distribution curve as a correction value of the anemoscope, and to store the correction value of the anemoscope for each incoming wind speed; and a control unit configured to correct the wind direction measured at the anemoscope with the correction value of the anemoscope for each incoming wind speed and to carry out power-generation control using the corrected wind direction as a control parameter.