A method for reduction of axial power variations of a wind...

F - Mech Eng,Light,Heat,Weapons – 03 – D

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F03D 7/02 (2006.01) F03D 11/00 (2006.01)

Patent

CA 2564635

A method which continuously reduces the variations of the rotor axial force and thus reduces fatigue loads on rotor blades and tower, whilst the resultant output to the generator is not significantly affected or is maintained within acceptable limits in relation to limitations of the drive gear, generator and power grid. A method of using the rotor axial force to actively counter the motions of a floating power plant. The method of using the rotor axial force to actively counter the motions of a floating power plant. The method also describes how rotational forces about the vertical axis (12) of the tower (4) are controlled and countered by cyclic variation of pitch angles and associated forces on the individual rotor blade. The method also describes how the aerodynamic force variation on each individual blade as a consequence of different wind velocities at different heights (vertical wind shear) and in the horizontal direction parallel to the rotor plane (horizontal wind shear) can be reduced.

La présente invention concerne un procédé permettant de réduire les variations de la force axiale du rotor, et dont de réduire la charge de fatigue sur les pales du rotor et le pylône, et ce, sans que la sortie résultante fournie au générateur n'en soit peu ou prou affectée, à tout le moins, sans sortir des limites acceptables pour l'engrenage, le générateur et le réseau. L'invention concerne également un procédé permettant d'utiliser la force axiale du rotor pour contrer activement les mouvements d'une usine électrique flottante. L'invention concerne aussi des procédures permettant de gérer les forces de rotation autour de l'axe vertical (12) du pylône (4) et de les contrer par des variations cycliques de l'angle de pas et des forces associées s'exerçant sur les pales de rotor prises une à une. L'invention concerne enfin des modalités permettant de réduire les variations de forces aérodynamiques s'exerçant sur les pales de rotor prises une à une en raison des différentes vitesses du vent selon la hauteur (cisaillement vertical du vent) et selon l'axe horizontal parallèle au plan du rotor (cisaillement horizontal du vent).

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