초록 ▼

Wind turbine blade (10) including adjustable lift-regulating means (12, 13, 15, 17, 19, 21) arranged on or at the surface of the wind turbine blade (10), said lift-regulating means being provided with activating means by means of which they can be adjusted and thus alter the aerodynamic properties o

Wind turbine blade (10) including adjustable lift-regulating means (12, 13, 15, 17, 19, 21) arranged on or at the surface of the wind turbine blade (10), said lift-regulating means being provided with activating means by means of which they can be adjusted and thus alter the aerodynamic properties of the blade (10). The lift-regulating means (12, 13, 15, 17, 19, 21) and the activating means are adapted and arranged such that by activation of the activating means, the lift can be reduced in a zone extending in the longitudinal direction of the blade (10) from a first position adjacent the blade tip (14) to a second position between the position and the blade root (16) and this second position is variable in the longitudinal direction of the blade (10) by adjusting activate means. The lift-regulating means are formed of at least one flexible flap (12, 13, 15, 17, 19, 21). The invention further relates to a wind turbine rotor including such wind turbine blades, to a wind turbine and to a method of controlling the wind turbine.

대표청구항 ▼

The invention claimed is: 1. Wind turbine blade including adjustable lift-regulating means arranged on or at a surface of the wind turbine blade and extending in a longitudinal direction of the blade, and activating means by which the lift-regulating means can be adjusted and thus alter the aerodyn

The invention claimed is: 1. Wind turbine blade including adjustable lift-regulating means arranged on or at a surface of the wind turbine blade and extending in a longitudinal direction of the blade, and activating means by which the lift-regulating means can be adjusted and thus alter the aerodynamic properties of the blade, the lift-regulating means and the activating means being adapted and arranged such that by activation of the activating means, the lift can be reduced in a zone extending in the longitudinal direction of the blade from a first position adjacent a tip of the blade to a second position between the first position and a root of the blade and this second position being variable in the longitudinal direction of the blade by adjusting the activating means characterised in that the lift-regulating means are formed of at least one flexible flap arranged on or at the surface of the wind turbine blade having a fixed blade profile, the at least one flexible flap extending in the longitudinal direction of the blade and being adjustable by means of one or more activating means to allow the lift-altering setting of the flap to be changed gradually in the longitudinal direction of the flap in order to reduce the lift of the blade gradually in the zone between the first position and the variable second position. 2. Wind turbine blade according to claim 1, characterised in that the lift-regulating means are formed of at least two flaps being displaced in relation to each other in the longitudinal direction of the blade. 3. Wind turbine blade according to claim 1, characterised in that the flap(s) is/are fixedly supported along a line in the longitudinal direction of the blade. 4. Wind turbine blade according to claim 1, characterised in that the activating means are driven by hydraulics, electromagnetism, pneumatics or piezoelectric fibres. 5. Wind turbine blade according to claim 1, characterised in that the flap is a stall-generating flap adjacent the leading edge of the blade. 6. Wind turbine blade according to claim 1, characterised in that it comprises load sensors arranged in or on the blade and measuring wind loads in form of wind pressure or strain. 7. Wind turbine blade according to claim 6, characterised in that it comprises a control system with a control unit connected with the activating means and the load sensors such that the control unit may activate the activating means and thus adjust the flap(s) in accordance with the measurements made by the load sensors. 8. Wind turbine blade according to claim 7, characterised in that the control system is adapted such that it can be linked with other corresponding blades on the same wind turbine to allow activation of the activating means on the basis of the load measurements from one or more of the other blades. 9. Wind turbine rotor with a plurality of wind turbine blades according to claim 8, said wind turbine rotor including a central control system with a control unit, and connected with the load sensors and flap(s) of each blade to allow the control unit to adjust the flap(s) of one or more of the blades based on the load measurements from each blade and/or the setting of the flap(s) of each blade. 10. Wind turbine rotor according to claim 9 comprising three wind turbine blades. 11. Wind turbine rotor according to claim 9 comprising a rotor hub, wherein the control unit of the central control system is mounted in the hub. 12. Wind turbine comprising a rotor according to claim 9. 13. Wind turbine comprising wind turbine blades according to claim 1. 14. Method of controlling a wind turbine according to claim 13, wherein the second position between the first position and the blade root is varied in the longitudinal direction of the blade by adjusting the activating means on the basis of the measured loads or measured wind speeds. 15. Method according to claim 14 for controlling a wind turbine, in which the blades are pitch-controlled and in which the rotational speed of the blades is kept substantially constant. 16. A fixed profile wind turbine blade having a variable surface profile, comprising: at least one flexible flap arranged on or at a surface of the wind turbine blade and extending in a longitudinal direction of the blade; and at least one actuator for adjusting the at least one flexible flap to alter a surface profile and aerodynamic properties of the wind turbine blade, wherein the at least one flexible flap and the at least one actuator are arranged so that when the at least one actuator adjusts the at least one flexible flap, lift can be reduced in a zone extending in the longitudinal direction of the wind turbine blade from a first position adjacent a tip of the wind turbine blade to a second position between the first position and a root of the wind turbine blade, wherein the second position is variable in the longitudinal direction of the wind turbine blade by adjusting the at least one flexible flap with the at least one actuator, the at least one actuator allowing a lift-altering setting of the at least one flap to be changed gradually in the longitudinal direction of the wind turbine blade in order to reduce the lift of the wind turbine blade gradually in the zone between the first position and the variable second position. 17. A fixed profile wind turbine blade according to claim 16, wherein the at least one flap is fixedly supported along a line in the longitudinal direction of the wind turbine blade. 18. A fixed profile wind turbine blade according to claim 16, wherein the actuator comprises at least one of hydraulics, electromagnetism, pneumatics or piezoelectric fibres. 19. A fixed profile wind turbine blade according to claim 16, wherein the at least one flap is a stall-generating flap located adjacent a leading edge of the blade.