Wind turbine and a blade for a wind turbine

摘要

A wind turbine with a rotor mounted on a hub section, wherein the rotor comprises a plurality of blades, at least one of which comprises a main blade section, which is optionally pitchable, and an auxiliary blade section mounted to the hub section. The auxiliary blade section is arranged in the area of a leading edge or of a trailing edge of the main blade, so that each blade is thereby provided with a leading edge slat or a trailing edge flap formed by the auxiliary blade section to increase the planform area of the blade and increase aerodynamic lift. A control method for a wind turbine controls a main blade section and an auxiliary blade section to provide different angles of attack to reduce undesired loads at sudden extreme changes of wind speed, e.g. during idling of the wind turbine. In a separate aspect, the invention provides a wind turbine having a blade with a non-pitchable leading edge slat, which extends at most 40% of the radius of the rotor in a longitudinal direction of the blade.

主权项

1. A wind turbine, comprising:
a hub section configured to be rotatable about a hub axis; and a rotor mounted on the hub section and including a plurality of blades, the rotor configured to be rotatable about a main axis of the wind turbine, and the hub axis being in fixed, co-axial alignment with the main axis of the wind turbine, wherein at least one of the blades of the rotor further comprises: a main blade section having a leading edge and a trailing edge and configured to be driven by wind to rotate around the main axis, wherein the main blade section has a blunt trailing edge; and at least first and second auxiliary blade sections configured to be driven by wind to rotate around the main axis, the second auxiliary blade section being separate from the first auxiliary blade section, wherein the at least first and second auxiliary blade sections are arranged in the area of at least one of the leading edge and trailing edge of the main blade section,
wherein the at least first and second auxiliary blade sections are directly mounted to the hub section and are configured to increase the planform area of the blade and increase aerodynamic lift, the first auxiliary blade section being configured to form a leading edge slat for the main blade section and the second auxiliary blade section being configured to form a trailing edge flap for the main blade section.