Patent ID: 8324749
Filing Date: 2012-12-04
Classification: F03D,F05B,Y02E

Abstract:
1. A wind turbine generator, comprising blades, a pitch control unit having an oil actuator for controlling a pitch of the blades, an oil pump for supplying operating oil to the oil actuator, an accumulator having an oil chamber in which the operating oil pressurized by the oil pump is stored, and a gas chamber filled with gas and expandable or contractable, the oil chamber and the gas chamber being divided by a partition, and a soundness diagnosis device, wherein the diagnosis device includes: a gas pressure judgment unit configured to judge soundness on the gas pressure of the gas chamber of the accumulator by comparing an oil pressure value detected by an oil pressure sensor provided in an oil circuit with a predetermined threshold after stopping the oil pump; a pitch movement judgment unit configured to judge, when the gas pressure judgement unit that the gas pressure is sound, soundness of a pitch movement of the pitch control unit based on whether a changing amount of a pitch angle by the pitch movement by the pressurized operating oil accumulated in the accumulator reaches over a predetermined threshold; and a start judgment unit configured to judge whether to start the gas pressure judgement unit by judging whether start conditions preliminarily determined for parts of the wind turbine generator are satisfied during every predetermined period or when a start switch is operated.