SGRE-Association

The present invention relates to a method of operating a wind farm (2) including a plural of wind turbines (3), the method including for at least a group of the wind turbines (3) to be uprated wind turbines (3u) adapted to produce power in an uprated zone (25u) being power above the design power of the wind turbines (3u), and wherein the method includes, if an under-frequency deviation event in the grid (9) is detected, then (120) to operate least one of the uprated wind turbines (3u) to produce power in the uprated zone (25u) and provide this as control power to stabilize the grid (9).The present invention further relates to a wind turbine or wind farm operated according to the method and a controller adapted to operate the method.

The invention relates to a method for producing a pre-impregnated reinforcement fabric for building a preform element, with the steps:- Building a layer arrangement from a reinforcement fabric layer (1) composed of weaved or stitched fibers (19) and a perforated polymer film layer (3) arranged in contact to the reinforcement fabric layer (1),- applying heat to the layer arrangement for providing at least a tacky surface of the polymer film layer (3) such that the polymer film layer surface (3) adheres to the contacted reinforcement fabric layer (1),- cooling the layer arrangement.

An arrangement for installation and/or transport of a plurality of towers and a method for mitigating a wind-induced vibrations on towers during the installation of wind turbines. An arrangement for installation and/or transport of a plurality of towers comprising at least one permeable membrane and a plurality of towers is provided. The permeable membrane is securely fixed to at least a pair of towers. Furthermore, a method for mitigating wind-induced vibrations, e.g. aeroelastic phenomena, on towers during installation and/or transport is provided. The method comprising the steps of arranging a plurality of towers side by side, thereby forming a tower group, positioning a permeable membrane to a first tower and a second tower of the group of towers, such that the permeable membrane is fixedly secured to an upper portion of the first and second towers, such that the permeable membrane extends therebetween the first and the second tower.

It is described a method of individual pitch control of three rotor blades (4a,b,c) of a wind turbine (1), in particular for reducing loads, the method comprising: determining tilt moment (12) and yaw moment (15) acting on the wind turbine (1), in particular from load measurement signals (17a,b,c); determining at least one maximal amplitude (39,23,24) of a pitch angle offset based on the tilt moment (12) and the yaw moment (15), the maximal amplitude (39,23,24) of a pitch angle offset being in particular prioritized for the reduction of loading in a selected moment direction; deriving individual amplitudes (26a,b,c) of pitch angle offsets for the three blades (4a,b,c), the amplitudes being restricted to be not greater than the maximal amplitude (39,23,24) of a pitch angle offset.

The invention relates to a computer-implemented method for predicting a vertical wind profile (WP) present at a wind turbine (1), where the method processes bending moment vectors (BV) at consecutive time points (t) derived from measurements, each bending vector (BV) comprising for one or more bending directions (d1, d2) a bending moment (bm1, bm2) for each blade (5) present at a predetermined location along the respective blade (5) at a respective time point (t), the method comprising the following steps: a) deriving from the plurality of bending moment vectors (BV) several spanwise load estimates (lesp) for each blade (5) and each bending direction (d1, d2), where each spanwise load estimate (lesp) is associated with a different horizontal portion (A1, A2, .., A6) of the circumferential area (CA) covered by the rotation of the blades (5),; b) feeding at least the spanwise load estimates (lesp) to one or more first trained machine learning models (MLa, MLb, MLc) each predicting an intermediate vertical wind profile (WPIa, WPIb, WPIc); c) deriving from the plurality of bending moment vectors (BV) several sectorwise load estimates (lese) for each blade (5) and each bending direction (d1, d2), where each sectorwise load estimate (lese) is associated with a different angular sector (AS) of the circumferential area (CA) covered by the rotation of the blades (5); d) feeding at least the sectorwise load estimates (lese) to one or more second trained machine learning models (MLa', MLb', MLc') each predicting a second intermediate vertical wind profile (WPIa', WPIb', WPIc'); e) feeding the first and second intermediate vertical wind profiles (WPIa, WPIb, WPIc, WPIa', WPIb', WPIc') as an input to a third trained machine learning model (MLe) predicting the vertical wind profile (WP) as an output.

An inspection method (300), system (10) and kit (16) for inspecting the interior of a wind turbine tower, comprising installing one or more cameras on an external periphery of an existing wind tower lift, with the cameras directed towards the tower's interior. The wind tower lift is then actuated to traverse a travel path within the tower. During this traverse, the cameras capture images of the interior components, which are analyzed to detect any abnormal conditions within the wind turbine tower's components.

The invention relates to a wind turbine gearbox (7) for transmitting torque from a rotor (4) to a generator (9) comprising at least one gearbox stage with a low speed shaft and a high speed shaft, and an adjustment means (100). According to the invention, the adjustment means (100) is arranged inside the wind turbine gearbox (7) and configured to shift a vibrational mode (M1, M2, M3) of at least one gearbox component.

The invention relates to a wind turbine gearbox (7), for transmitting torque from a rotor (4) to a generator (9), comprising a gearbox axis (15) and two planet stages (12, 13, 14), a first planet stage (12,13) and a second planet stage (13,14), wherein the planet carrier (20, 120, 220, 320) of the second planet stage (13,14)comprises a main body part (22, 222, 322) and a sun wheel shaft part (23, 223, 323) connected to each other. The sun wheel shaft part (23, 223, 323) is meshing with the planet wheels (40, 140, 240, 340) of the first planet stage (12,13). According to the invention, the main body part (22, 222, 322) and the sun wheel shaft part (23, 223, 323) of the planet carrier (20, 120, 220, 320) are joint by a rigid connection (21).

A method for dynamically controlling power derating in an electrical component involves obtaining the coolant inlet temperature of the component and an electrical load parameter. A dynamic temperature threshold for power derating is determined, varying as a function of the electrical load parameter. The measured coolant inlet temperature is compared to this dynamic temperature threshold, and the active and/or reactive power output of the electrical component is adjusted based on the dynamic temperature threshold.

The invention relates to an electric generator (7) for a wind turbine (1), comprising a stator (11), a rotor (10), which is rotatably mounted with respect to the stator (11), and an air cooling system (32) for guiding an airflow flowing along an airpath (33) which extends through the electric generator (7), wherein the stator (11) comprises at least one structural component (21) having a hollow cross sectional profile and at least one first opening (39) and at least one second opening (40), wherein each of the openings (39, 40) leads into a hollow interior of the respective structural component (21), wherein the at least one first opening (39) is arranged on or fluidly communicates with a first location of the airpath (33), wherein the at least one second opening (40) is arranged on or fluidly communicates with a second location of the airpath (33), wherein within the at least one first opening (39) and/or within the at least one second opening (40) at least one sealing device (38) is arranged which prevents the airflow from flowing through the interior.