Abstract: Provided is a method for exchanging electric power with an electricity supply grid that has a grid frequency using a converter-controlled generation unit that may be a wind power installation or a wind farm, at a grid connection point. The method includes exchanging electric power depending on a control function. The electric power includes active and reactive power and the control function controls the power depending on at least one state variable of the electricity supply grid. It is possible to switch between a normal control function and a support control function, different from the normal control function, as the control function. The normal control function is used when it has been recognized that the electricity supply grid is operating stably and the support control function is used when a grid fault or an end of the grid fault has been recognized.

Abstract: A method for feeding electrical power into an electrical supply network by means of at least one wind power installation having a power control and a generator, comprising the steps of: creating an electrical power gradient for an electrical power to be generated by the wind power installation wherein the power gradient at least: is limited by means of a stabilization operator or is created by means of a prediction operator in such a way that the electrical power gradient is unequal to a predicted wind power gradient, adjusting the created electrical power gradient in the power control of the wind power installation, generating an electrical power by means of the wind power installation depending on the created electrical power gradient for a feed-in time period with a feed-in time.

Abstract: A generator, in particular of a wind power installation, for generating electric current, comprising a rotor and a stator having stator teeth and grooves arranged between said stator teeth for receiving at least one stator winding, wherein a measuring device is provided to determine the deflection of at least one stator tooth of the stator in connection with the generator, wherein the measuring device is connected to at least one measuring unit, which is embodied as a strain gauge.

Abstract: The object is attained by a method of erecting a wind turbine tower having a plurality of tower segments which are tensioned by means of tensioning members. A plurality of tensioning members is provided and a fixing unit is fixed at an end of the tensioning members. Fixing of the fixing unit is effected by placing a multi-part wedge unit at a free end of the tensioning members which comprise a plurality of tensioning wires. A sleeve is fitted over the wedge unit and a pulling tab is fixed on or at the sleeve. The pulling tab has an opening. A cable is fixed at or in the hole in the pulling tab. The cable with the fixing unit and thus the tensioning members is pulled upwardly. The fixing unit is fixed at a segment of the tower, that is to be fixed. The sleeve is removed before the tensioning member is braced.

Abstract: There is provided a wind turbine rotor blade having a blade outer side, a wall with a laminate, a blade inner side and at least a first and a second rotor blade part. The at least one first and second rotor blade parts are fixed together by means of at least one connecting unit in a separation plane. The connecting unit has at least one cable with a first end with cable fibers which are fixed in or at the laminate of the wall. The connecting unit has at least one projection at the first and second rotor blade parts respectively. The projections are respectively fixedly connected to the wall of rotor blade. The at least one cable is connected at at least one projection. The connecting unit has at least one tensioning element, by means of which the projections on the first and second rotor blade parts can be braced with each other.

Abstract: There is provided a wind turbine comprising a tower which has a wall, a cooling device having an air inlet unit and an air outlet unit which are provided in the lower region of the tower. The air inlet unit and the air outlet unit each have an outer portion, a central portion and a shutter unit. The outer portions are provided outside the wall of the tower, the central portions are provided in the region of the wall of the tower and the shutter units are provided within the tower. The air inlet unit and the air outlet unit have fixing units, by means of which the central portions can be fixed to the wall of the tower from the interior of the tower.

Abstract: A rotor blade, a wind turbine and a method for installing and producing a rotor blade.

Abstract: A method for feeding electrical power into an electrical supply grid by means of at least one wind power installation at a grid connection point, wherein the at least one wind power installation has an aerodynamic rotor with rotor blades and the rotor has a moment of inertia and can be operated with variable rotor speed, the at least one wind power installation has a generator for generating a generator power, multiple energy generators feed power into the electrical supply grid and multiple consumers take power from the electrical supply grid, so that a power balance in the electrical supply grid between the power fed in and the power taken is produced and is positive if more power is fed in than is taken, and the method comprises the steps of: feeding in a basic electrical power in dependence on available wind power, specifying a supporting power to be additionally fed in and additionally feeding in the specified supporting power to be additionally fed in for supporting the electrical supply grid, an amount

Abstract: A method for operating a wind turbine, in particular at a location characterized by a cold climate is provided. The method includes, specifying an air density at a location of the wind turbine, setting a blade angle of an adjustable rotor blade based on an output power, torque and/or rotor speed. The method includes setting the blade angle as a function of a at pitch characteristic curve which specifies the blade angle as a function of the output power, the torque and/or the rotor speed and as a function of the air density. According to the pitch characteristic curve, the blade angle has a minimum as a function of the air density in a region of a reference density of an atmosphere at the location which is characterized by a cold climate.

Abstract: A method of controlling a wind power plant for generating electrical power from wind is provided. The plant comprises a rotor having rotor blades with adjustable blade angles and the rotor can be operated at a variable rotational speed. The method includes controlling the plant in a partial load mode when wind speed is below a nominal speed and, controlling the plant in a storm mode when the wind speed is above a storm commencement speed. An output power of the plant in the partial load mode and storm mode is adjusted according to an operating characteristic curve that determines a relationship between the rotational speed and the output power. A partial load characteristic curve is used as the operating characteristic curve for controlling the power plant in partial load mode, and a storm mode characteristic curve is used as the operating characteristic curve for controlling the plant in storm mode.

Abstract: A method for operating a charging station for charging a plurality of electric vehicles, in particular electric automobiles, wherein the charging station is connected to an electricity supply grid at a grid connection point in order thereby to be supplied with electrical energy from the electricity supply grid, the grid connection point is arranged on a first grid section of the supply grid and at least one further electrical consumer is connected to at least one second grid section of the supply grid, the first and the second grid section are connected to one another, the at least one further consumer and/or the at least one second grid section are able to be influenced by the charging station, the charging station is controlled such that a grid voltage in at least one of the grid sections is controlled, and/or a power flow at least in the at least one second grid section is controlled.

Abstract: A method for supplying power at a network connection point into an electric supply network having a network frequency by means of a converter-controlled generator unit, in particular a wind turbine, comprising the following steps: supplying electric power depending on a control function, wherein the electric power can comprise active and reactive power, and a selection can be made between a normal control function and at least one frequency-maintaining control function differing from the normal control function as a control function, and the normal control function is selected if it has been recognized that the electric supply network is operating in a normal state, and the frequency-maintaining control function is selected if a steady-frequency operating state is present or is being prepared, wherein a steady-frequency operating state describes an operating state particularly of the electric supply network in which the network frequency is to be maintained at a constant value.

Abstract: Provided is a method of supplying at least one component of a wind turbine with energy. The energy during operation of the wind turbine is taken from energy generated using a generator of the wind turbine and provided for supply to the at least one component of the wind turbine. Provided is an energy supply device for performing the method and a wind turbine having the energy supply device.

Abstract: A rotor blade for a wind turbine, a wind turbine, a wind park and a method for configuring a rotor blade which is divided in two.

Abstract: a method of controlling a wind power installation comprising the steps: detecting a precipitation in the region of the wind power installation by a precipitation sensor, and controlling the wind power installation in a first operating mode based on a first pitch angle characteristic in which the pitch angle is set in dependence on the power, and in a second operating mode based on a second pitch angle characteristic, wherein the first operating mode is selected if there is no precipitation and the second operating mode is selected if there is precipitation.

Abstract: A synchronous generator of a gearless wind turbine is provided. The synchronous generator includes a rotor and a stator. The stator has a stator ring having teeth and slots arranged therebetween for receiving a stator winding. In a circumferential direction, the stator ring is divided into stator segments, each having an equal number of slots. Within a segment, the slots have a substantially equal spacing with respect to each another in the circumferential direction. In at least one connecting region of two segments, the spacing of at least two adjacent slots, which are each assigned to one of two different segments, differs from the spacing of the slots within a segment. The stator winding is formed with form coils. A method for producing a synchronous generator is provided and a use of aluminum and copper form coils in the generator is provided.

Abstract: A wind power installation and a method for feeding a filtered alternating current into an electrical supply grid by the wind power installation are provided. The wind power installation includes at least one inverter having an inverter output for providing an inverter current. The at least one inverter is coupled at its inverter output to an active filter. The active filter filters the inverter current provided at the inverter output and provides the filtered alternating current for feeding into the electrical supply grid. The method includes providing the inverter current at the inverter output by switching at least one switch of the inverter, sensing the switching, and controlling the active filter based on the sensed switching to filter the inverter current provided at the inverter output and produce the filtered alternating current.

Abstract: A generator rotor for a wind power plant, wherein the generator rotor has at least one dividing plane for dividing the generator rotor into at least two segments. The dividing planes extend in the generator rotor along asymmetrical section lines of the generator rotor. A generator stator for a wind power plant, a generator of a wind power plant, and a wind power plant and a method for transporting a generator.

Abstract: An annular bracket for the external tensioning of a tower segment, in particular a tower segment of a wind power plant, to an external tensioning system of a hybrid tower, preferably a hybrid tower of a wind power plant, to a tower section of a hybrid tower, preferably a hybrid tower of a wind power plant, to a hybrid tower, preferably a hybrid tower of a wind power plant, to a wind power plant, and to an assembly method of an external tensioning system for a hybrid tower, preferably for a hybrid tower of a wind power plant.