Method and apparatus for controlling windmill blade pitch
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United States of America Patent
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-
Jan 17, 1984
Grant Date -
N/A
app pub date -
Feb 7, 1983
filing date -
Feb 7, 1983
priority date (Note) -
Expired
status (Latency Note)
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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.
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