| 摘要 |
A wind turbine (1) is disclosed having a rotor (4) with at least two blades (5) and a blade pitch system (6) for controlling the pitch angle of said blades (5),
the blade pitch system (6) comprising for each of said blades a hydraulic blade pitch drive (8) and at least two valves (22a, 22b, 22c) mutually connected in parallel for controlling a flow of liquid to the hydraulic blade pitch drive (8) for that blade (5), wherein said valves (22a, 22b, 22c) each comprises an arrangement for providing a variable flow of liquid. |
