Fluid reaction surfaces (i.e. – impellers) – With means positioning fluid current driven impeller...
Reexamination Certificate
2008-03-24
2011-10-25
Look, Edward (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
With means positioning fluid current driven impeller...
C416S037000, C416S041000
Reexamination Certificate
active
08043055
ABSTRACT:
A wind turbine generator system is provided with a nacelle supporting a wind turbine rotor, a nacelle rotation mechanism, an anemometer, and a control apparatus controlling the nacelle rotation mechanism. Said control apparatus calculates the wind direction deviation from the wind direction measured by the anemometer and the direction of the wind turbine rotor. Said control apparatus performs a yaw rotation of the nacelle by the nacelle rotation mechanism when any of conditions (1) and (2) is satisfied; the condition (1) is a condition under which a state where the absolute value of said wind direction deviation is equal to or more than a first threshold value continues for a first duration predetermined, and the condition (2) is a condition under which a state where the absolute value of said wind direction deviation is equal to or more than a second threshold value larger than said first threshold value continues for a second duration shorter than said first duration.
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Fujitsuka Teppei
Fukami Koji
Hayashida Kazuki
Matsuo Atsushi
Noguchi Toshihide
Berner Kenneth M.
Ellis Ryan
Hauptman Benjamin J.
Kanesaka Manabu
Look Edward
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