Abstract: The present invention is directed to a method of reducing a mechanical load on the occurrence of voltage dip in the wind turbines. The wind turbine generator controller and the converter control unit work in combination to control the oscillation generated due to voltage dip in the wind turbine 100. The method applies a ramp in power recovery to allow the enhanced DTD damp oscillations before the peak in torque happens. The method involves the step of: delivering a maximum active power value by the converter control unit to the wind turbine generator controller. Next step is setting a saturation value for the set points to enhance the drive train limits. In the next step, ramping is applied to the power set points of the wind turbine generator. And finally an enhanced drive train damping s applied to the ramped value of the power in order to reduce the mechanical load in the wind turbine and to damp the oscillation in the wind turbine generator.

Abstract: A control system to improve the production of a variable speed wind turbine comprising control devices for a standard regulation tracking a power vs. generator speed curve that also uses an alternative regulation for optimizing the energy production along determinate time periods Tb for compensating previous energy losses at a higher power Pb than the power determined by the standard regulation, the alternative regulation being based on a continuous calculation of the accumulated lost energy ALE as the energy lost with respect to the maximum allowed energy production according to the standard regulation and the fixation of the higher power Pb and a setting of the duration of the time periods Tb being compatible with wind turbine electrical or mechanical limitations. A wind turbine controlled by the method.

Abstract: The present invention is directed to a method of reducing a mechanical load on the occurrence of voltage dip in the wind turbines. The wind turbine generator controller and the converter control unit work in combination to control the oscillation generated due to voltage dip in the wind turbine 100. The method applies a ramp in power recovery to allow the enhanced DTD damp oscillations before the peak in torque happens. The method involves the step of: delivering a maximum active power value by the converter control unit to the wind turbine generator controller. Next step is setting a saturation value for the set points to enhance the drive train limits. In the next step, ramping is applied to the power set points of the wind turbine generator. And finally an enhanced drive train damping s applied to the ramped value of the power in order to reduce the mechanical load in the wind turbine and to damp the oscillation in the wind turbine generator.

Abstract: Method of operation of a variable speed wind turbine (11) having control means for its regulation tracking a power vs. generator speed curve (31) comprising a nominal zone (39) where the power is kept constant at a nominal value, a first sub-nominal zone (33) where the generator speed is kept constant at its coupling value, a second sub-nominal zone (35) where both generator speed and power are allowed to increase/decrease in line with wind speed and a third sub-nominal zone (37) between the second sub-nominal zone (35) and the nominal zone (39) that comprises a first vertical segment (41) at a generator speed nr2 higher than the generator nominal speed nr1 and a second vertical segment (43) at the generator nominal speed nr1 connecting with the nominal zone (39), each of both segments (41, 43) to be followed in function of the wind speed changes for optimizing the energy production.

Abstract: Wind turbine comprising one or more blades, incorporating in each blade a damping device comprising a first damping element tuned at the main resonance frequency of the blade ? o and K additional damping elements tuned at frequencies ? 1, ? 2, . . . ? k so that in the event of blade vibrations its amplitude A is reduced in a percentage Y of the amplitude Ao at the main resonance frequency of the blade ? o in a band extended above and below the main resonance frequency of the blade ? o in a percentage X of ? o, said frequencies ? 1, ? 2, . . . ? k being comprised within said band.

Abstract: Method of operation of a variable speed wind turbine (11) having control means for its regulation tracking a power vs. generator speed curve (31) comprising a nominal zone (39) where the power is kept constant at a nominal value, a first sub-nominal zone (33) where the generator speed is kept constant at its coupling value, a second sub-nominal zone (35) where both generator speed and power are allowed to increase/decrease in line with wind speed and a third sub-nominal zone (37) between the second sub-nominal zone (35) and the nominal zone (39) that comprises a first vertical segment (41) at a generator speed nr2 higher than the generator nominal speed nr1 and a second vertical segment (43) at the generator nominal speed nr1 connecting with the nominal zone (39), each of both segments (41, 43) to be followed in function of the wind speed changes for optimizing the energy production.

Abstract: Method of operation of a variable speed wind turbine (11) comprising control means for a standard regulation tracking a power vs. generator speed curve (21) that also uses an alternative regulation for optimizing the energy production along determinate time periods Tb for compensating previous energy losses at a higher power Pb than the power determined by said standard regulation, said alternative regulation being based on a continuous calculation of the accumulated lost energy ALE as the energy lost with respect to the maximum allowed energy production according to the standard regulation and on a setting of said higher power Pb and a setting of the duration of said time periods Tb being compatible with wind turbine electrical or mechanical limitations. The invención also refers to a wind turbine controlled by said method.

Abstract: Blade (1) extending along a geometric axis (1gXY/1gYZ) from a root (111XY/111YZ) where the blade (1) is joined to the rotor (2) to a tip (122XY/122YZ). The blade has in a projection on a side/front plane XY/YZ a side/front root portion (11XY/11YZ) extending from the side/front root (111XY/111YZ) to a first intermediate side/front point (112XY/112YZ); a side/front tip portion (12XY/12YZ) extending from a second intermediate side/front point (121XY/121YZ) to the side/front tip (122XY/122YZ). The side root portion (11XY) forms an acute angle ?1 with the axis y in the side root (111XY), 0°??1?10° and the side tip portion (12XY) forms an acute angle ?2 with the axis y in the second intermediate side point (121XY), 0°??2?10°. The front root portion (11YZ) forms an acute angle ?1 with the front pitch axis (1pYZ) in the front root (111YZ), ?10°??1?10° and the front tip portion (12YZ) forms an acute angle ?2 with the front pitch axis (1pYZ) in the second intermediate front point (121YZ), 0°??2?10°.