Wind turbine blade pitch control system

Details Wind turbine blade pitch control system Wind turbine blade pitch control system

1980-03-17

1982-09-07

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

With control means responsive to non-cyclic condition...

Impeller rotation speed responsive

416 48, 416158, F03D 702

Patent

active

043481558

ABSTRACT:
A pitch control system for a multibladed variable pitch wind turbine. Each of the turbine blades is pivotally driven about the longitudinal axis thereof independently of the other blades by at least a pair of hydraulic actuators. The actuators are supplied with pressurized hydraulic fluid from a first source thereof under conditions of normal pitch change adjustment. Under conditions wherein feathering of the blades is required, the actuators are supplied with hydraulic fluid from second sources thereof such that one of the actuators associated with each of the blades is supplied with fluid from one second source and a second actuator is provided with fluid from a redundant second source whereby blade feathering may be effected despite a malfunction of one of the redundant sources or one of the actuators. In one of the two preferred embodiments disclosed, the first and second fluid sources are maintained in mutual communication whereby fluid from the second sources thereof may supplement fluid from the first source under conditions of normal blade pitch adjustment.

REFERENCES:
patent: 2355039 (1944-08-01), Eves
patent: 2597419 (1952-05-01), Westbury et al.
patent: 3256780 (1966-06-01), Riley et al.
patent: 4065010 (1977-12-01), Worback
patent: 4161658 (1979-07-01), Patrick
patent: 4201514 (1980-05-01), Huetter
patent: 4274808 (1981-06-01), Garner et al.

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