Prime-mover dynamo plants – Electric control – Fluid-current motors
Reexamination Certificate
2011-04-19
2011-04-19
Ponomarenko, Nicholas (Department: 2839)
Prime-mover dynamo plants
Electric control
Fluid-current motors
C416S018000
Reexamination Certificate
active
07928593
ABSTRACT:
The present invention relates to a method for damping oscillations in a wind turbine comprising a wind turbine tower, a nacelle arranged on top of said wind turbine tower, and a number of rotor blades rotatably connected to the nacelle. The oscillations to be damped originate from forces induced on the nacelle and the wind turbine tower by the rotating rotor blades. The method comprises the steps of providing an internally suspended pendulum mass structure being operationally connected to an upper tower section, providing a platform being fixedly attached to the upper tower section, and providing damping means comprising one or more friction members being displaceably arranged relative to the platform, the one or more friction members being adapted to be displaced relative to the platform in response to relative movements between the suspended pendulum mass structure and the platform in order to dissipate energy from the suspended pendulum mass structure by friction.
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Ponomarenko Nicholas
Vestas Wind Systems A/S
Wood Herron & Evans L.L.P.
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