Vestas Wind Systems A/s

Jakob Hviid Nielsen

Fabio Caponetti

Jesper Lykkegaard Neubauer

Martin Ansbjerg Kjær

Poul Brandt Christensen

Jesper Nyvad

Jesper Lykkegaard Andersen

Poul Torben Tietze

Ole Mølgaard Jeppesen

Erik Garde

Frank Møller Hansen

Simon Kabus

Kasper Zinck Østergaard

Jan Vestergaard Knudsen

Carsten Roed

Lasse Køgs Andersen

John Schwensen

Soren Kjaer Nielsen

Robert GRØN-Stevens

Christian SKALLEBÆK

Søren Kjær Nielsen

The present invention relates to a hydraulic pitch system for pitching a blade of a wind turbine having a hub by means of a hydraulic fluid. The system comprises at least one hydraulic cylinder for adjusting a pitch angle of the blade, the hydraulic cylinder comprising a pitch piston movable in the hydraulic cylinder, and a first port and a second port arranged on each side of the pitch piston, and an accumulator hydraulically connected to the cylinder. The system further comprises a pitch safety system adapted to maintain the blade in a predetermined pitch angle when a person is entering the hub of the wind turbine for service and/or maintenance, the pitch safety system comprising a first valve which by activation releases a pressure in the hydraulic pitch system by draining off the accumulator for the hydraulic fluid until the pressure has reached a predetermined pressure level.

Hydraulic pitch system for a wind turbine

Growing community of inventors

Tjele, Denmark

Jakob Hviid Nielsen