Method and apparatus for controlling windmill blade pitch

Details Method and apparatus for controlling windmill blade pitch Method and apparatus for controlling windmill blade pitch

1983-02-07

1984-01-17

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Method of operation

416 41, 416 11, F03D 704

Patent

active

044261926

ABSTRACT:
In order to control the turbine speed of a windmill employed for power generation, the pitch of the turbine blades is based on a dual-deadband control strategy. If the current turbine speed is determined to be outside of a relatively wide deadband, action is taken to correct the speed by changing blade pitch accordingly. If the current speed is not outside of the relatively wide deadband, then the average of the turbine speed over a recent interval is compared with a relatively narrow deadband within the wider deadband. Action is then taken to change the blade pitch if the average speed is outside the narrow deadband. In this way, wide excursions of turbine speed are corrected promptly, but the frequency of control actions is minimized by requiring only the average speed to be kept within tight limits.

REFERENCES:
patent: 4193005 (1980-03-01), Kos
patent: 4297076 (1981-10-01), Donham
patent: 4329117 (1982-05-01), Doman
patent: 4339666 (1982-07-01), Patrick et al.
patent: 4348154 (1982-09-01), Ducker

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