Patent ID: 9222464
Filing Date: 2015-12-29
Classification: F03D,F05B,Y02E

Abstract:
1. A controller for a wind turbine generator in which a rotor having a blade rotates due to being struck by wind, a generator coupled to the rotor via a main shaft generates electricity based on the rotation of the rotor, and torque acting on the main shaft continues to increase as a striking wind speed that is a speed of wind striking the blade increases, the controller comprising: a power control unit that controls power of the generator in accordance with the striking wind speed, wherein the power control unit is configured to start reducing the power of the generator to suppress an increase in the torque by making the power of the generator fall to a power less than or equal to a rated power in a case where the power of the generator has reached the rated power and has been kept at the rated power, and thereafter, when the striking wind speed increases continuously, the striking wind speed reaches a predetermined second wind speed that is lower than a first wind speed that is predetermined as a wind speed at which the torque reaches a limit value at which the possibility of causing wear in a device exists, and thereafter to stop generation of electricity by the generator in a case where the striking wind speed reaches a predetermined third wind speed that is higher than the first wind speed.