Siemens Gamesa Renewable Energy

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.

It is described a method and arrangement of determining a resistance (R) of at least one multi-phase stator winding set (7) of an electrical generator (4), in particular permanent magnet generator, the method comprising: operating the generator (4) by performing closed loop current control (11) including to receive a reference stator winding current (12) and an actual stator winding current (13, 13'), in particular respective d-component and q-component in a rotor fixed dq-frame; supplying, for a selected time interval (t0-t1), to the current control, a modified actual stator winding current (13') being different from the actual stator winding current (13) by a current modification quantity (34, 15); determining the resistance (R) of the stator winding set (7) based on at least one component of an actual stator winding current (i_alpha_dc) or the current modification quantity (i_dc) and at least one component of a stator winding voltage (u_alpha).

The present invention relates to a method to control wake in a wind farm (2) comprising plural of wind turbines (3), where the method includes;- providing a free wind at the wind farm (2), where the free wind includes a free wind direction (10),- using the free wind direction (10) to identify at least one waked wind turbine (3b, 3c) and a waking wind turbine (3a, 3b) waking the waked wind turbine (3b, 3c),- for a period of time measure or register multiple sampling parameters at the waked wind turbine (3b, 3c) covering a range of wind directions (10),- calculate a relation factor (40) based on a relation between the sampling parameters of the waked wind turbine (3b, 3c) and similar sampling parameters of a second wind turbine (3),- use the relation factor (40) to identify a wake position (30, 30new),- control a waking wind turbine (3a, 3b) of the waked wind turbine (3b, 3c) based on a correction related to the identified wake position (30, 30new).The invention further relates to a controller to perform the method, and a wind turbine or wind farm being controlled accordingly.

The present invention relates to a method to control a renewable power plant (2) having a rated plant power being a maximal power generation of first power devices (3) and second power devices (4) of the renewable power plant (2), and where the power plant (2) is adapted to feed generated power to an electrical distribution grid (7) having a grid capacity, where the grid capacity is limited relative to the rated plant power, and wherein the control includes a for at least the first power devices (3) to be operated by basic FRT schedules at the detection of an event in the electrical distribution grid (7), and where the method includes to replace the basic FRT schedules with updated FRT schedules under given event conditions (deviation) where updated FRT schedules is updated within a maximum time distance to the detection of the event. The present invention further relates to a controller operating the method, and a renewable power plant being controlled accordingly.

A damping device for a rotor blade of a wind turbine is provided. The damping device (10) is configured to damp vibrations of the rotor blade (100) in a non-operating condition of the rotor blade when mounted to the rotor blade (100). The damping device (10) comprises a body (15) configured to be mounted to the rotor blade (100). The body (15) has a first protruding section (41) configured to protrude from a pressure side (104) of the rotor blade and/or has a second protruding section (42) that is configured to protrude from a suction side (103) of the rotor blade. The body (15) is made of a plastic material and is at least partially enclosed in a shell (16). A rigidity, hardness, and/or a density of a material of the shell (16) is higher than a rigidity, hardness, and/or a density, respectively, of the material of the body (15).

An arrangement (1) and associated methods (400), for treating bearing systems during storage and/or transport, the arrangement (1) comprising two or more drive trains (2) or groups (10, 11) of drive trains (2), wherein each drive train (2) includes a generator (6), a rotatable element/s, a bearing system supporting the rotatable element/s, and a means for transmitting torque to the rotatable element/s upon receiving a power signal (8), the arrangement (1) comprising a power management system (3) that controls the power signal to the a means for transmitting torque, ensuring that each drive train or group of drive trains has at least one active rotation interval that is distinct from the rotation intervals of other drive trains or groups.

A tool 100 intended for positioning bolts is provided. The tool comprises a frame with a distal portion 1a and proximal portion 1b, a shaft a shaft (2) rotatably mounted on the proximal portion (1a) of the frame (1), moving means (3) operatively connected to the shaft (2) to facilitate rotation of said shaft (2) and a holding element (4) fixedly mounted on the shaft (2), configured to secure a plurality of bolts to be inserted I the holes of a tower flange (210).Furthermore, an installation arrangement is provided and a method for positioning bolts, the steps of the method being providing the tool (100), placing the plurality of bolts within the holding element (4), positioning the shaft (2) and the holding element (4) and inserting the bolts into corresponding holes of the tower flange (210).

The invention describes a cable pulling arrangement (1) for use in the installation of power cables (5) in a wind turbine tower (2), comprising a transport unit (11) adapted to transport a winch assembly (12) between levels (22, 28) of the tower (2); a docking assembly (14) adapted to dock the transport unit (11) to the tower (2); and a cable guide (13) adapted to guide a winch wire (122) between levels (22, 28) of the tower (2) during a cable pulling procedure. The invention further describes a method of performing a cable pulling procedure using such a cable pulling arrangement (1).

It is described a method of determining rotor position related information of an electrical machine (6), the method comprising: at a first rotor position, performing a HFI-method to obtain a first measurement signal set (16); at a second rotor position, performing a HFI-method to obtain a second measurement signal set (17); and deriving a corrected rotor position (θ_real1, θ_real2) and/or a rotor position error (err_6f) based on the first measurement signal set (16) and the second measurement signal set (17).

Stabilization assembly (1) for stabilizing a load (L) suspended from a crane hook (32) of a service crane (3) during vertical displacement of the load (L) between an upper position (P1) and a lower position (P0), comprising a tagline arrangement comprising a tagline (11, 11A, 11B) adapted for connection to the crane hook (32) and a tagline winch (10, 10A, 10B) arranged at a lateral offset from the lower position (P0); and a control arrangement (12) configured to determine a lateral force (F<w>) acting on the load (L) during vertical displacement of the load (L), to compute a tagline tension (F<11>, F<11A>, F<11B>) on the basis of the determined lateral force (F<w>), and to control a tagline winch (10, 10A, 10B) accordingly.