The present invention relates to a method of increasing the output of a wind turbine, wherein one or more flow surfaces are placed at a wind turbine. At lower wind speeds, the flow surfaces are set to guide the wind up towards and/or out from the rotor of the wind turbine and hence use the venturi e
The present invention relates to a method of increasing the output of a wind turbine, wherein one or more flow surfaces are placed at a wind turbine. At lower wind speeds, the flow surfaces are set to guide the wind up towards and/or out from the rotor of the wind turbine and hence use the venturi effect in the rotor to advantage. At higher wind speeds, the flow surfaces are completely or partially taken out of the flow of the wind. Moreover, the flow surfaces can be adjusted around the wind turbine based on measurements of the speed of the wind and direction of the wind and/or the power signal of the wind turbine. The invention further relates to a system comprising one or more flow surfaces and means for adjusting same to the effect that the output of a wind turbine can be maximised by using the venturi effect to advantage as described above.
대표청구항▼
1. A method of increasing the output of a wind turbine (101) comprising placement of at least one flow surface (202) characterised in that the flow surface (202) is, at lower wind speeds, adjusted to create a venturi effect by guiding the wind in towards and/or out from the rotor of the wind turbine
1. A method of increasing the output of a wind turbine (101) comprising placement of at least one flow surface (202) characterised in that the flow surface (202) is, at lower wind speeds, adjusted to create a venturi effect by guiding the wind in towards and/or out from the rotor of the wind turbine, and such that the flow surface is, at higher wind speeds, at least partially taken out of the flow of the wind. 2. A method of increasing the output of a wind turbine according to claim 1, characterised in that the at least one flow surface is placed by the wind turbine to influence the wind flow to the wind turbine. 3. A method of increasing the output of a wind turbine according to claim 1, characterised in that the at least one flow surface is placed by a second wind turbine (100) to influence the wind flow to the second wind turbine being located in front of the first one. 4. A method of increasing the output of a wind turbine according to claim 1, characterised in that the at least one flow surface is at least partially taken out of the flow of the wind by laying down the flow surface along the ground. 5. A method of increasing the output of a wind turbine according to claim 1, characterised in that the at least one flow surface is taken at least partially out of the flow of the wind by it being folded or rolled up. 6. A method of increasing the output of a wind turbine according claim 1, characterised in further comprising to measure the direction of the wind and to place the at least one flow surface relative to the wind turbine as a function of the direction of the wind. 7. A method of increasing the output of a wind turbine according to claim 1, characterised in further comprising to measure the speed of the wind and to set the at least one flow surface as a function thereof. 8. A method of increasing the output of a wind turbine according to claim 1, characterised in further comprising to receive a power signal from the wind turbine and to set the at least one flow surface as a function thereof. 9. A system of increasing the output of a wind turbine (101) comprising at least one flow surface (202) placed such that, at lower wind speeds, the flow surface creates a venturi effect by guiding the wind in towards and/or out from the rotor of the wind turbine; and said system further comprising means (204) for setting the flow surface such that, at higher wind speeds, the flow surface is at least partially taken out of the flow. 10. A system according to claim 9, characterised in that the at least one flow surface is placed by the wind turbine to influence the wind flow to the wind turbine. 11. A system according to claim 9, characterised in that the at least one flow surface is placed by a second wind turbine to influence the wind flow to the second wind turbine being located in front of the first one. 12. A system according to claim 9, characterised in that the means for setting the at least one flow surface comprises at least one hydraulic motor or electro-motor. 13. A system according to claim 9, characterised in further comprising a wind speed indicator. 14. A system according to claim 9, characterised in further comprising a wind direction meter. 15. A system according to claim 9, characterised that the at least one flow surface is mounted rotatable about the wind turbine, eg by being mounted on rails, pontoons or ships. 16. A system according to claim 9, characterised in that the at least one flow surface is mounted on or at the ground and/or the water surface and is of a height corresponding to the distance there from to the lowermost part of the rotor of the wind turbine or less. 17. A system according to claim 9, characterised in that the at least one flow surface is made of a composite plastics material, such as eg glass fibre or carbon fibre. 18. A system according to claim 9, characterised in that the at least one flow surface is made of canvas. 19. A system according to claim 9, characterised in that the system is coupled to the control system of the wind turbine for receiving signals for setting of the at least one flow surface. 20. A wind turbine, characterised in comprising a system for increasing the output of a wind turbine as described by claim 9. 21. Use of a method for increasing the output of a wind turbine as described by claim 1.
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