Abstract: A method for operating a wind turbine is provided. The wind turbine has a tower with external tower loads acting thereon and has an aerodynamic rotor with rotor blades having adjustable pitch angles, which rotor generates rotor thrust. The method comprises the following steps: determining a speed of a tower head of the tower and/or of a nacelle of the wind turbine, determining an absolute wind speed in the region of the wind turbine, determining a pure wind power on the rotor on the basis of the absolute wind speed, determining an apparent wind power on the rotor on the basis of the speed of the tower head and/or of the nacelle, determining an aerodynamic tower vibration power on the basis of a difference between the apparent wind power and the pure wind power, and performing feedback control of the wind turbine using the aerodynamic tower vibration power.

Abstract: A method for testing a lightning protection system in a wind turbine rotor blade is provided. The lightning protection system is contacted in the region of a rotor blade root. A measuring line having an electrically conductive tip is positioned in the interior of the rotor blade or outside on the rotor blade until the conductive tip is in contact with an element of the lightning protection system. A signal is fed via the measuring line and the signal arriving at the lightning protection system in the region of the rotor blade root is measured in order to check the mode of operation of the lightning protection system in the rotor blade.

Abstract: A rotor blade for a wind turbine, comprising a rotor blade root for fixing the rotor blade to the hub of a wind turbine, an inner blade portion which extends from the rotor blade root in the direction of a longitudinal extension of the rotor blade, and a rear edge segment for increasing the depth of the rotor blade in the profile depth direction in the region of the inner blade portion, wherein the rear edge segment is fixed to the inner blade portion and has an edge facing the inner blade portion. A cover lip is proposed which overlaps with the edge and is arranged in a transition region from the inner blade portion to the edge of the rear edge segment.

Abstract: A method for producing a split rotor blade, a method for connecting a split rotor blade, a rotor blade, a rotor blade segment, a rotor, a wind power plant, and a production device for producing rotor blades. A method for producing a split rotor blade, comprising: providing a rotor blade having a spar cap and an extension in the longitudinal direction from a blade root region to a blade tip; making at least one groove in the spar cap, the groove being arranged in a first connection region of the rotor blade, and a portion of the main extension direction of the groove being oriented parallel to the longitudinal direction; splitting the rotor blade, in the first connection region, into a rotor blade section facing the blade root and a rotor blade section facing away from the blade root, a first groove section being arranged in the rotor blade section facing the blade root and a second groove section being arranged in the rotor blade section facing away from the blade root.

Abstract: A rotor blade for a wind power installation with a longitudinal direction in which the rotor blade extends, at least one first rotor blade segment with a first end face, and at least one second rotor blade segment with a second end face, wherein the first rotor blade segment is coupled on the end face in the longitudinal direction to the second rotor blade segment, wherein the first and second rotor blade segments each comprise: a blade laminate with a plurality of laminate layers which are arranged stacked in a profile thickness direction, and arranged on the end face, a plurality of mounting elements for coupling the first rotor blade segment to the second rotor blade segment, wherein each of the mounting elements extends in the longitudinal direction and has two contact faces which are arranged transversely, in particular orthogonally to the longitudinal direction at a distance from one another which diminishes in non-linear fashion towards the end.

Abstract: A machine support for a wind power installation, in particular a gearless wind power installation, wherein the machine support is designed to be rotated about a tower axis by means of an azimuth drive, and has a supporting structure which has a first mechanical interface for connecting the machine support indirectly or directly to an azimuth bearing and a second mechanical interface for assembling a generator or an axle journal on the machine support. It is proposed in particular that the supporting structure has one or a plurality of lateral through openings as access to the azimuth drive and/or the azimuth bearing.

Abstract: A nacelle of a wind turbine comprising a machine carrier which is adapted to be installed on a tower of the wind turbine and to carry a generator and a rotor hub of the wind turbine, a working frame installed on the machine carrier and having one or more working planes, and a nacelle housing which encloses the machine carrier and the working frame for protection from weather influences, wherein the nacelle housing has a nacelle base compartment accessible from the working frame. It is proposed that the nacelle base compartment is adapted to be lowerable relative to the working platform. A wind turbine and a maintenance method is also provided.

Abstract: A wind turbine with a nacelle with a nacelle floor is thus provided. The wind turbine further has an aerodynamic rotor with at least two rotor blades. The wind turbine further has a tower, on which the nacelle is arranged. At least one first and second opening are provided in the nacelle floor. The first opening is used to transport first components of the wind turbine, and has corresponding first dimensions. The second opening has second dimensions, and is used to transport a transformer into the nacelle. The transformer has a floor that closes the second opening when the transformer has been conveyed through the second opening into the nacelle and mounted in the nacelle.

Abstract: A wind power plant comprising a first structural element, a second structural element, a bearing assembly by means of which the first structural element is rotatably mounted on the second structural element, a first flange connection between the first structural element and the bearing assembly, a second flange connection between the second structural element and the bearing assembly, and at least one drive, held by a support structure for rotating the first structural element relative to the second structural element. The support structure is formed as a plate and is arranged at one of the flange connections.

Abstract: A method for controlling a wind power installation includes measuring a grid voltage of an electrical power supply grid, setting a DC-link voltage at a converter of the wind power installation depending on the measured grid voltage and using a first time constant and a second time constant, wherein the first time constant is different than the second time constant.

Abstract: A rotor blade of a wind turbine, having a rotor blade length, a rotor blade depth extending over the rotor blade length, a rotor blade thickness extending over the rotor blade length, and a thickness of a trailing edge of the rotor blade extending over the rotor blade length, wherein, in a region of the rotor blade length, the rotor blade simultaneously has a splitter plate that has a predetermined length and a Gurney flap that has a predetermined height, wherein a ratio of the predetermined height of the Gurney flap to the predetermined length of the splitter plate at a particular position in the direction of the rotor blade length is selected in such a manner that a threshold value that decreases with a relative profile thickness, which is defined as a ratio of the rotor blade thickness to the rotor blade depth, is not reached.

Abstract: Provided is a control module of a converter, in particular a power converter of a wind power installation, which is configured to control the converter in such a way that the converter emulates a behavior of a synchronous machine, comprising an, in particular internal, control loop which has an, in particular adjustable, virtual admittance by means of which the converter is controlled in order to emulate the behavior of the synchronous machine.

Abstract: A method for feeding electrical power into a grid at a grid connection point using a wind farm having installations connected to the point using transmission lines. The farm controller transmits active and reactive power specifications to the installations. A first power range is respectively specified at each installation and spans a range of values for active and reactive power to be fed in. The first power range has an active power limit to be complied with by the installation and a reactive power limit which can be reached by the installation and a second power range is specified at the grid connection point and spans a range of values for active and reactive power to be fed in. At least one installation respectively exceeds the active power limit, and the second power range is complied with by the wind farm at the grid connection point.

Abstract: A segment sheet for a stator lamination stack of a generator of a wind turbine, wherein the segment sheet has the shape of a ring segment, having a first radial section, in which recesses are provided for receiving a stator winding, having a second radial section, which is arranged radially adjacent to the first section and which forms a segment of a magnetic yoke of the generator, and having a third radial section, which is arranged radially adjacent to the second section. The proposal is that the third radial section has at least two recesses arranged in an azimuthally spaced manner, which are designed for a positive connection to profiled strips arranged on a stator support ring.

Abstract: A control system of a wind power installation and/or a wind farm is provided. The control system has a plurality of operating modes and has an interface. The interface is configured for providing maximum adjustability of the wind power installation and/or the wind farm in critical power grid situations. The interface is configured to receive a signal of a power grid operator, as a result of which all of the plurality of operating modes are released and made available to the power grid operator.

Abstract: A method for attenuating low-frequency oscillations in an electrical power supply grid by means of a feed device which feeds into the electrical power supply grid, in particular a wind power installation, wherein the electrical power supply grid has a grid voltage and a grid frequency, comprising the following steps: picking up a grid signal having the low-frequency oscillations, splitting a total frequency range of the grid signal in which oscillations to be attenuated are to be expected into a plurality of partial frequency ranges, each having a lower and an upper range frequency, performing in each case one frequency analysis of the grid signal for each partial frequency range in order to identify in each case one or more oscillations having an oscillation frequency in the partial frequency range, if present, identifying a low-frequency oscillation to be attenuated as target oscillation depending on the frequency analyses of all of the partial frequency ranges, detecting the target oscillation at least acc

Abstract: A wind power installation with an azimuth bearing having an azimuth gearing, and at least one azimuth drive, which is coupled to an azimuth gear mechanism corresponding to the azimuth gearing. The azimuth gear mechanism has a drive pinion which is rotatable about a pinion axis, wherein the drive pinion is configured to engage in the corresponding azimuth gearing of the azimuth bearing, wherein the pinion axis has a predefined reference orientation. The wind power installation comprises at least one sensor device which is configured to detect a deviation of the orientation of the pinion axis relative to the reference orientation.

Abstract: A method for testing a rotor blade component of a rotor blade for a wind power installation, comprising: dividing a rotor blade component of a rotor blade for a wind power installation into two, three or more rotor blade component segments, forming cutouts in a connection interface at a connection end of one of the rotor blade component segments. A rotor blade component segment of a rotor blade for a wind power installation, the rotor blade component segment comprising a connection end which has been formed by dividing a rotor blade component of a rotor blade for a wind power installation into two, three or more rotor blade component segments, a connection interface at the connection end of the rotor blade component segment, and cutouts which are formed in the connection interface and serve for connection of the rotor blade component segment to a test stand.

Abstract: A method for setting a pitch angle of a rotor blade for a rotor of a wind turbine, a control device for setting a pitch angle of a rotor blade for a rotor of a wind turbine, and a wind turbine. In particular, a method for setting a pitch angle of a rotor blade for a rotor of a wind turbine, in particular for avoiding suction-side flow separation, wherein the rotor blade is movable rotationally about a rotor blade longitudinal axis for setting the pitch angle by means of a pitch drive, comprising the steps: determining an aerodynamic power of the rotor, establishing a nominal pitch angle as a function of the aerodynamic power, and setting the pitch angle to the established nominal pitch angle.

Abstract: A rotor blade of a wind turbine, wherein the rotor blade has in particular a splitter plate, which is arranged on the blunt trailing edge of the rotor blade. The splitter plate comprises: a root edge, wherein the root edge is arranged on, in particular along, the trailing edge below a transition from the suction side into the trailing edge, an end edge, wherein the end edge forms a free edge, and a surface between the root edge and the end edge, wherein the surface has at least one curved part between the root edge and the end edge, and at least one part of the surface lies in the shear layer generated by the suction side. A rotor blade of a wind turbine, wherein the rotor blade has in particular a splitter plate, which is arranged on the blunt trailing edge of the rotor blade.