BLADE PITCH CONTROL SYSTEM, WIND TURBINE 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.