Abstract: Provided is a method for feeding electrical power into an electrical supply network using a converter-controlled infeed apparatus. The apparatus feeds into a local network section of the electrical supply network at a network connection point. The network has further infeed apparatuses and consumers for consuming electrical power. The local section has a ratio of power able to be fed in using converters to a total power able to be fed in by all infeed apparatuses of at least 50%. A controller controls the infeed of the electrical power depending on a network state of the network. The controller has control behavior that depends on a network characteristic of the local section. The network characteristic is dependent on at least one property of the local section and at least one property of a further network section of the network or a determination that no further network section is present.

Abstract: There is provided a method of controlling a wind turbine on starting or running up the wind turbine before the wind turbine is connected to an electrical supply grid or before the wind turbine is connected to the electrical energy supply grid again. The wind turbine has a rotor having a rotor arresting means, at least one rotor blade and at least one blade angle detection sensor for each rotor blade for detecting the blade angle of the rotor blade. The blade angle of the at least one rotor blade is detected by means of the blade angle detection sensor. Unlocking of the rotor arresting means is blocked until the detected at least one blade angle is within a predetermined angle range. In that way it is possible to ensure that the rotor arresting means is released only when the blades are for example in the feathered position.

Abstract: The present disclosure relates to a method for operating a converter on a three-phase electrical power supply grid, comprising the following steps: operating the converter in a first operating mode by means of a control unit for generating an output current, wherein the converter in the first operating mode operates in such a way as to apply a voltage to the electrical power supply grid; detecting a grid fault on the electrical power supply grid by means of a detection means during the first operating mode; limiting the output current of the converter by means of current limitation when a grid fault on the electrical power supply grid has been detected during the first operating mode, in particular in such a way that the output current of the converter falls below a predetermined maximum current or substantially corresponds thereto.

Abstract: The disclosure concerns a wind turbine, comprising: a hub with a hollow cylindrical region with a mean circumference UN; at least one rotor blade mounted rotatably on the hub, with a blade laminate which extends in the longitudinal direction of the rotor blade and at least in portions forms a hollow cylinder with a mean circumference UR; and at least one blade bearing for mounting the rotor blade on the hub, with a first bearing ring which is arranged on the hub side and connected by means of a first flange connection to a rotor hub flange formed on a rotor-blade side end portion of the hub, wherein the first flange connection has at least one hub longitudinal bolt which is arranged on a circumference UNB coaxially to the blade bearing; and a second bearing ring which is arranged on the rotor blade side and connected by means of a second flange connection to a rotor blade flange formed on a hub-side end portion of the rotor blade, wherein the second flange connection has at least one rotor blade longitudinal

Abstract: Provided is a method for identifying a blade malposition of a rotor blade of a wind power installation having one rotor and at least three rotor blades which in terms of the blade angles thereof are individually adjustable. For each rotor blade an actual angle is detected as the actual value of the blade angle; and the blade malposition is identified as a function of a blade angle deviation of the rotor blade and a rotational progress of the rotor. The blade angle deviation describes a deviation of the actual angle from a reference angle, and the rotational progress is representative of an angle about which the rotor has rotated onward after a start criterion. Blade malpositions in rotor blades which in terms of the blade angles thereof are individually adjustable are identified rapidly and reliably.

Abstract: A controller structure for a wind turbine having an aerodynamic rotor with at least one rotor blade, wherein the controller structure is designed to control a rotation speed of the rotor of the wind turbine, wherein the controller structure is designed as a cascade control arrangement and has an outer control loop and an inner control loop, wherein the inner control loop receives an input signal which comprises a change in the rotation speed, an acceleration of the rotation speed, a function of the change in the rotation speed and/or a function of the acceleration of the rotation speed.

Abstract: A steel tower ring segment for a wind turbine tower section, to a wind turbine tower section, to a wind turbine tower and to a wind turbine, and also to methods for producing a steel tower ring segment and a wind turbine tower section. A steel tower ring segment for a wind turbine tower section, comprising a first casing segment with a segment height, a segment length in the segment circumferential direction, a first segment thickness, and a first horizontal joint side, wherein the first casing segment has a first thickening region in a region adjoining the first horizontal joint side, wherein the first thickening region has a first thickening thickness, and the first thickening thickness is larger than the first segment thickness, wherein the first thickening region has a first cutout, wherein the first cutout is arranged spaced apart from the first horizontal joint side, and wherein a first passage opening leads from the first cutout to the first horizontal joint side.

Abstract: A method for controlling heating of rotor blades of an aerodynamic rotor of a wind turbine, wherein, the heating of the rotor blades is initiated, if icing of the rotor blades is expected, wherein according to an icing criteria, if icing is expected is evaluated depending on a determined ambient temperature, a determined relative humidity, and a determined wind speed, each defining a determined weather parameter, and further according to the icing criteria, if icing is expected is evaluated depending on a temporal change of at least one of these weather parameters and/or of at least one other weather parameter.

Abstract: A method for detecting a sensor malfunction of a load sensor of a wind power installation having a rotor and at least one rotor blade, wherein the load sensor is configured to detect a loading variable of one of the rotor blades, and the sensor malfunction involves the functional freezing of a sensor signal from the load sensor, such that it remains temporally constant, wherein at least one loading variable of the rotor blade is estimated and, in the event that the sensor signal is temporally constant, a comparability test is executed wherein, according to the at least one estimated loading variable, a check is executed as to whether a non-constant sensor signal is to be anticipated, and a sensor malfunction is identified by reference to the comparability test.

Abstract: Air cooling device for the air cooling of a generator of a wind power installation by means of wind, comprising a cooling unit of the generator with a cooling unit outer surface, the wind flowing onto said cooling unit outer surface for the air cooling of the generator during the operation of the wind power installation, wherein an air deflector is arranged on the cooling unit outer surface of the cooling unit and has a first air deflection unit which extends outwardly at an acute angle starting from the cooling unit outer surface and forms with the cooling unit a converging first air deflection channel, which is configured in an operating state of the wind power installation to deflect the wind for the air cooling in the direction of the cooling unit.

Abstract: Provided is a method for feeding electrical power into an electrical supply network having a network voltage using a wind turbine having an inverter, which has a DC voltage intermediate circuit having an intermediate circuit voltage and a chopper circuit connected to the intermediate circuit for discharging electrical energy from the intermediate circuit. The method includes feeding electrical power into the network in a normal operation if no network fault has been detected, detecting a fault if the network voltage falls below an undervoltage value, interrupting or reducing the feed if the fault has been detected, and ending the interruption or reduction if the end of a network fault is detected. During the fault and/or from the end of the fault, the fed-in power is limited to a limit, and, to limit the power, the intermediate circuit voltage is limited using the chopper circuit depending upon the limit.

Abstract: A rotor blade for a wind power installation, which extends in a longitudinal direction with a profile course from a blade connector to a blade tip, wherein the profile course contains at least one profile, comprising: a suction side and a pressure side, a relative profile thickness of greater than 25%, a profile chord, which extends between a leading edge and a trailing edge of the profile and has a length which defines the profile depth, a mean line which extends at least partially below the profile chord, a convex region which extends on the suction side from the trailing edge, and a convex region which extends on the pressure side from the trailing edge, wherein the convex region on the pressure side defines a rounded transition region of the pressure side to the trailing edge.

Abstract: A method for transporting a tower section of a wind turbine, comprising the steps of: providing a tower section which is adapted to be transported in a predetermined transport position, wherein the tower section when in the transport position has a longitudinal axis extending in the horizontal direction and a wall extending along the longitudinal axis, wherein the tower section is adapted to adopt a first vertical height when in an unstressed state in the transport position, applying a deformation force to the wall so as to elastically deform at least one portion of the tower section in such a way that the tower section adopts a second vertical height that is smaller than the first vertical height when in an elastically deformed state in the transport position, and locking the tower section in the elastically deformed state.

Abstract: The invention relates to a method for feeding electrical power into an electrical supply grid. The method includes rectifying a first AC voltage of an electrical power, produced by a generator, into a first DC voltage and increasing the first DC voltage to a second DC voltage such that the second DC voltage has a step-up ratio in relation to the first DC voltage. Alternatively, the method includes rectifying the first AC voltage into the second DC voltage without producing the first DC voltage. The method includes inverting the second DC voltage into a second AC voltage for feeding electrical power into the electrical supply grid depending on an feed setpoint value and setting the second DC voltage depending on the feed setpoint value and actual value. The second DC voltage is increased depending on an increase in the feed setpoint voltage or actual value.

Abstract: A method of adjusting at least one rotor blade of a wind turbine which includes the steps of receiving a command for adjustment of the rotor blade at an adjustment speed, ascertaining a current moment of inertia of the rotor blade and acceleration of the rotor blade until reaching the adjustment speed, wherein the acceleration until reaching the adjustment speed is limited in dependence on the ascertained moment of inertia. A system and a wind turbine.

Abstract: A cable holder, in particular for a cable of a wind turbine, to a cable harness, to a tower, to a wind turbine and also to a method for fastening a cable. In particular, a cable holder, in particular for a cable of a wind turbine, preferably for a medium-voltage cable connected to a medium-voltage transformer of a wind turbine, comprising a cable mount with a funnel-like cavity and also comprising an elastic insert, which is arranged within the funnel-like cavity, wherein the cable mount and the elastic insert are arranged and designed such that the cable can extend through the funnel-like cavity and the elastic insert can be clamped in between the cable mount and the cable.

Abstract: A controller structure for a wind turbine having an aerodynamic rotor with at least one rotor blade, wherein the controller structure is designed to control a rotation speed of the rotor of the wind turbine, wherein the controller structure is designed as a cascade control arrangement and has an outer control loop and an inner control loop, wherein the inner control loop receives an input signal which comprises a change in the rotation speed, an acceleration of the rotation speed, a function of the change in the rotation speed and/or a function of the acceleration of the rotation speed.

Abstract: The present disclosure relates to a method for operating a wind power installation, to an associated wind power installation and to a wind farm. The method comprises the following steps: determining at least two, preferably at least three and particularly preferably all the environmental parameters of the environment of the wind power installation selected from the list consisting of: turbulence intensity, air density, air temperature and shear; providing boundary conditions for operating the wind power installation, the boundary conditions containing at least one from a load boundary condition, a noise level boundary condition and a power boundary condition; adapting an operational control, in particular an operating point and/or an operating characteristic, of the wind power installation on the basis of a combination of the changes in the determined environmental parameters taking into consideration the boundary conditions.

Abstract: The invention relates to a method for determining the energy production to be expected for a wind power installation for a forecast time period, which may be an expected annual energy production. The installation has installation components. In the method, at least one of the installation components is selected as a thermally relevant component and chronologically distributed wind speed values are specified for the forecast time period. An expected power output level of the installation is determined for one of the wind speed values. In the power output level determining step, a component temperature which is assigned to this wind speed value is taken into account by the at least one thermally relevant component. The expected power output level of the installation, which is determined for the wind speed value, is used to determine the energy production of the installation which is to be expected for the forecast time period.

Abstract: A rotor blade of a wind turbine, to an associated wind turbine and to an associated method. A rotor blade for a wind turbine, which extends in the longitudinal direction with a profile course from a blade connector to a blade tip, wherein the profile course comprises a course of a lift coefficient, comprising a hub portion adjacent to the blade connector and a tip portion adjacent to the blade tip, a middle portion adjacent to the hub portion and to the tip portion, wherein the middle portion substantially comprises those profile sections which have a relative profile thickness, which is defined as the ratio of maximum profile thickness to profile depth, of between 20% and 30%, and wherein the middle portion comprises a local minimum of the course of the lift coefficient.