Siemens Gamesa Renewable Energy

The invention describes a wind turbine drive train (7) for transmitting torque from a wind rotor (4) to a generator (9) comprising a rotor shaft (6) supported in a rotor front bearing (25) and a rotor rear bearing (26). The rotor front bearing (25) and the rotor rear bearing (26) are pretensioned against each other. A gearbox (8) is connected to the rotor shaft (6), and a gearbox support (31) fixed to a gearbox housing (30). The gearbox support (31) is configured to be connected to pretension means (42) configured to pretension the rotor shaft (6) in an axial direction of the rotor shaft (6) .The invention further describes a wind turbine for use in reinstating preload in a bearing of such a wind turbine drive rain (7); and a method of reinstating a preload force in a bearing of a wind turbine drive train (7).

The invention describes a method of controlling a wind turbine (2), which method comprises deducing the presence of ice accretion (3) on the rotor blades (20); and subsequently, in a first stage (S1), effecting an increase in rotor speed (ω) by adjusting a power reference (Pref) of the wind turbine (2); and subsequently, in a second stage (S2), continually adjusting the rotor blade pitch angle (β) on the basis of the observed output power (P_obs) to maximise the output power (P_obs). The invention further describes a wind turbine (2) comprising a means of observing the output power (P_obs) of the wind turbine (2); and a wind turbine controller (22) adapted to apply the claimed method.

Wind turbine, control system, and method of operating a wind turbine (1) under potential icing conditions to reduce vibrations during idling or standstill operation, comprising: determining a potential icing condition for one or more blades (2,3,4), establishing a danger zone (10) where the falling of ice is to be avoided, identifying a risk of falling ice within the danger zone (10, wherein if a risk of falling ice in the danger zone (10) is identified, the method comprises: a) setting a pitch angle (P) of a first rotor blade (2) close to 0°, wherein a one or more further blades (3,4) comprise a pitch angle (P) differing by at least 30° from the first rotor blade (2); and b) adjusting the rotor yaw orientation (W) away from the danger zone (10).

The invention describes an installation assembly (1) for use in installing a secondary nacelle structure (20S) underneath a wind turbine nacelle (20), which installation assembly (1) comprises a winch assembly comprising at least a winch cable (16) and a winch (18); a means (10, 11) of connecting the winch cable (16) to the secondary nacelle structure (20S); a bracket (12) adapted for installation at the mounting height of the secondary nacelle structure (20S); and a means (10, 102, 122, 14) of connecting the bracket (12) to the secondary nacelle structure (20S) after raising the secondary nacelle structure (20S) to its mounting height using the winch assembly (16, 18). The invention further describes a method of mounting a secondary nacelle structure (20S) underneath a wind turbine nacelle (20) using a number of such installation assemblies (1).

An assembly stand (1) and associated method for assembling a concrete ring (11) from a plurality of concrete segments (10), the assembly stand (1) comprising a plurality of beams (2) configured to support the concrete segments during their assembly into the concrete ring, in particular the beams mounted with a star configuration from the central axis, a movement mechanism (3) mounted on one or of more of the plurality of beams (2), in particular mounted on all beams (2), wherein each movement mechanism (3) is configured to contact or engage with an underside of the concrete segments (10) and to allow a controlled movement of the concrete segments (10) relative to the beam (2) when an assembly force (F) is applied.

The invention describes a friction shim (1) for use between the mating faces (21F, 22F) of two rotary components (21, 22) of a drivetrain (2), the friction shim (1) comprising a rigid substrate (10); an annular arrangement of holes (11), each hole (11) placed to receive a fastener (24) of a bolted joint between the rotary components (21, 22); characterized in that the outer edge (12) of the friction shim (1) comprises a series of lobes (12P, 12T) defined by a first radius (R1) and a second radius (R2), wherein the first radius (R1) extends from a centerpoint (C) of the friction shim (1) and crosses a hole (11) and extends beyond that hole (11) by a first predetermined distance (d1); the second radius (R2) extends between adjacent holes (11); and the first radius (R1) exceeds the second radius (R2) by a second predetermined distance (d2). The invention further describes a drivetrain (2) comprising such a friction shim (1) between the mating faces (21F, 22F) of first and second rotary components (21, 22); and a method of assembling such a drivetrain (2).

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