Blade Pitch Controller, Wind Turbine Generator, And Method Of Controlling Blade Pitch

Abstract: A hydraulic cylinder (48) is coupled to blades (20) of a wind turbine generator and actuated to change a pitch angle of the blade (20). A variable displacement hydraulic pump (44) supplies hydraulic oil to the hydraulic cylinder (48), and a discharge pressure of the pump does not follow a load pressure. When the discharge pressure of the hydraulic pump (44) becomes a set pressure, a pressure control valve is opened to change a discharge amount of the hydraulic pump (44), and to make the discharge pressure of the hydraulic pump (44) to be a pressure smaller than a cut off pressure. Further, a setting control unit (60) sets the set pressure based on the hydraulic pressure that the hydraulic cylinder (48) requires such that the set pressure becomes a minimum pressure required to change the pitch angle to a predetermined angle by the hydraulic cylinder (48). Thus, it is possible to reduce a differential pressure between the discharge pressure of the hydraulic pump (44) and the load pressure, and to reduce the power consumption.

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