BLADE PITCH CONTROL DEVICE, WIND POWER GENERATOR, AND BLADE PITCH CONTROL METHOD

摘要

A wind turbine generator (10) generates power through rotation of a rotor to which a plurality of blades (20) are pivotally coupled and includes a pitch-angle control section (62) that outputs a pitch-angle command value that indicates the amount of change in the pitch angle of each of the blades (20), hydraulic cylinders (48) each of which changes the pitch angle of the corresponding blade (20) based on the corresponding pitch-angle command value output from the pitch-angle control section (62), and load measurement sections (66) that measure blade-root loads. A set value indicating that wind received by the wind turbine generator (10) has a biased wind speed distribution is set in advance in the pitch-angle control section (62). Only when a calculated pitch-angle command value exceeds the set value, the pitch-angle control section (62) outputs a pitch-angle command value beyond pitch command limit values. Therefore, in the wind turbine generator (10), a higher load than necessary is not imposed on a drive unit for the pitch angle of each of the blades (20) in a case of a normal wind speed or a wind speed distribution caused by the normal wind speed, and the blade-root load can be sufficiently reduced even in a case of a wind speed distribution that occurs when a strong wind is received.