Abstract: A method for determining an energy yield loss of a first wind turbine (1-49) of a wind farm (51) that includes a plurality of wind turbines (1-49). The first wind turbine (1-49) is operated in a reduced energy yield mode that is outside an energy-optimized normal operating mode and a reduced energy yield of the first wind turbine (1-49) is determined. At least one second wind turbine (1-49) is selected according to a pre-determinable criterion. The energy yield of the at least one second wind turbine (1-49) is determined and depending upon the energy yield of the at least one second wind turbine (1-49), an energy yield potential of the first wind turbine (1-49) is determined. The difference between the energy yield potential of the first wind turbine (1-49) and the determined reduced energy yield is formed.

Abstract: A method is provided for operating a wind power plant (15-19) with a rotor-driven (25-29) electric generator (30) for delivering electric power to an electric grid (31) which provides a grid voltage in which, when excess voltage prevails in the grid (31), idle power from the wind power plant (15-19) is fed to the grid (31) in order to lower the voltage. A wind power plant is provided (15-19) with a rotor-driven electric generator (30) for delivering electric power to an electric grid (31) in which when excess voltage prevails in the grid idle power from the wind power plant (15-19) is fed to the grid (31) in order to lower the voltage. Monitoring occurs to determine whether within a predeterminable time a voltage was lowered to a predeterminable reference value and/or an idle current is delivered which is greater than or equal to a predeterminable idle current reference value.

Abstract: A method for the production of a rotor blade (1) for a wind power plant, wherein the produced rotor blade (1) in its longitudinal extension, which extends from a rotor blade root (2) essentially to a rotor blade tip (3), has at least one area, in which the rotor blade has an aerodynamic blade section (4, 4?, 4?), which has a leading edge (5) and a trailing edge (6), which are connected via a suction side (7) and a pressure side (8) of the blade section (4, 4?, 4?), wherein at least a first and at least a second molded part (11, 12) manufactured in the longitudinal direction of the rotor blade (1) are provided for a suction side (7) and a pressure side (8) of the rotor blade (1), which are to be connected with each other in the areas of the leading edge (5) and the trailing edge (6). A corresponding rotor blade (1) for a wind power plant and a wind power plant with a corresponding rotor blade (1).

Abstract: An offshore wind farm can include at least two wind energy installations for generating electrical power from wind, at least two acoustic warning devices, and a visibility measuring device for detecting visibility. After detection of a visibility below a visibility limit value, an activation signal can be applied to the at least two acoustic warning devices. One or more synchronization modules can be provided which determine the points in time of the acoustic signals to be emitted by at least one of the acoustic warning devices in relation to the acoustic signals of the other acoustic warning devices. Accordingly, this facilitates the navigation along an offshore wind farm and enables safe circumnavigation. Also, the impression of a contiguous area can be conveyed to the ships by the synchronized emission of the warning signals.

Abstract: The invention relates to a method for performing an oil change on a wind power plant, comprising the steps of rotating the rotor (3) to a maintenance position, subsequently draining the oil out of a first variable-speed gearbox (6), filling the first variable-speed gearbox (6) with fresh oil, draining the oil out of a second variable-speed gearbox (6?) that is oriented differently than the first gearbox, and filling the second drive device (6?) with fresh oil. The variable-speed gearboxes each comprise a sump (63) having a first outlet opening (65) and a mirrored sump (64) on the opposite end of the housing thereof having a second outlet opening (66). Thus, the rotor (3) does not need to be rotated further during the oil change. The oil change can be performed simultaneously on several or all variable-speed gearboxes, reducing time and personnel expenses. The invention further relates to a correspondingly designed drive device and to an oil changing device.

Abstract: A device for the production of rotor blades (1) for wind power plants with a multi-part manufacturing mold (20, 21, 22) for a rotor blade (1) that along a longitudinal extension, which extends from a rotor blade root (2) substantially to a rotor blade tip (3), has at least one area in which the rotor blade (1) has an aerodynamic airfoil section (4), which has an airfoil leading edge (5) and an airfoil trailing edge (6) that are connected via a suction side (8) and a pressure side (7) of the airfoil section (4), wherein at least two partial molds (21, 22; 34, 35) are provided for at least two shell parts (23, 24; 36, 37) of a rotor blade (1), of which a first shell part (23; 36, 37) and a second shell part (24; 36, 37) substantially lying flat on each other in the area of the airfoil trailing edge (6) are to be connected together.

Abstract: A method and manufacturing unit for producing a rotor blade (5) of a wind turbine (1) from at least a first rotor blade element (11, 11?, 12, 12?) and a second rotor blade element (11, 11?, 12, 12?). The first rotor blade element (11, 11?, 12, 12?) and the second rotor blade element (11, 11?, 12, 12?) are positioned in the desired relative arrangement with respect to each other such that a joint gap (13) remains between the first rotor blade element (11, 11?, 12, 12?) and the second rotor blade element (11, 11?, 12, 12?). Adhesive is introduced into the joint gap (13) for joining the first rotor blade element (11, 11?, 12, 12?) and the second rotor blade element (11, 11?, 12, 12?).

Abstract: A method, a device (20), an arrangement and a use for applying a reference mark on a rotor blade (1) for a wind power plant. After producing the rotor blade (1) in a manufacturing mold (34, 34?, 35) and before removing the rotor blade (1) from the manufacturing mold (34, 34?, 35), a reference mark is applied in the area of a rotor blade root (5) of the rotor blade (1) by means of a marking device (23), which is connected or can be connected to a holding device (21) disposed at a predetermined or predeterminable position on the manufacturing mold (34, 34?, 35).

Abstract: A wind farm includes a plurality of wind energy installations, a transfer point at which electrical energy produced by the wind energy installations is transferred to a public electricity grid system and for which nominal values are preset, and a measurement sensor configured to measure electrical actual values at the transfer point. The wind farm also includes a master regulator associated with an upper control level and configured to use upper nominal values and upper actual values at the upper control level to determine a preset for a lower control level, and a plurality of submaster regulators associated with the lower control level and configured to use the preset as a lower nominal value and, on the basis of the lower nominal value and a lower actual value, determine presets for the wind energy installations. A high level of control accuracy can thus be achieved even in large wind farms.

Abstract: The invention relates to a method for operating a wind turbine by switching on an aircraft warning light, the luminaries of which comprise LEDs, said LEDs radiating light with a maximum intensity in the range of visible light. At least one NIR LED is switched on when the aircraft warning light is switched on, said at least one NIR light source radiating light with a maximum intensity in the NIR range.

Abstract: A harmonic predictor for a wind farm comprising at least two wind turbines, each having a generator with a converter for generating electrical energy. The harmonic predictor determines the harmonic component expected from the wind farm in order to limit the harmonic component to a harmonic limit. The harmonic predictor comprises a calculation module, an iteration module and a summing module. The calculation module calculates a complex mean value over at least one period of the harmonic component of one of the wind turbines and determines a first equivalent vector therefrom. The iteration module successively connects the calculation module to at least one other of the wind turbines to form at least one second equivalent vector. The summing module sums the equivalent vectors to form a total vector and compares the total vector with the harmonic limit.

Abstract: A tubular tower (11), of a wind energy plant (10) with a current conduction means system (25, 35) for transmitting electrical power from a generator on the tower (11), to a power module at the base of the tower. The current conduction means system (25, 35) has three electrical conductors (27.1, 27.2, 27.3; 37.1, 37.2, 37.3; 45.1, 45.2, 45.3) arranged next to one another. A housing (26, 36, 46) is connected to the inner tower wall at predetermined distances using connecting devices which have electrical cross-sections conducting with the tower wall. The distances between the connecting devices in the longitudinal extent of the tower (11) and the cross-sections of the connecting devices between the housing (26, 36, 46) and the tower wall are dimensioned such that during a fault, the voltage drop between the tower wall and the housing (26, 36, 46) does not exceed a predetermined touch voltage.

Abstract: An arrangement of components (12, 13, 30) for a wind power plant. A first component (12, 13) has a flange (15, 130) having a flange contact surface (121, 122, 133). A second component (30) has a flange-mounting surface (131, 132) for a flange (15, 130) of the first component (12, 13). Alternatively, the second component (12, 13) has a flange (15, 130) having a flange contact surface (122, 133) and the flange contact surface (122, 133) of the first component (12, 13) and the flange-mounting surface (131, 132) of the second component (30) are arranged opposite each other, or the flange contact surfaces (122, 121) of the components are arranged opposite each other. At least one flange contact surface (121, 122, 133) of a flange (15, 130) and/or the flange-mounting surface (131, 132) of the second component (30) has an outer coating made of a chrome-steel alloy.

Abstract: A wind turbine having a generator for generating electrical energy and a transformer is disclosed. The transformer is designed to receive electrical energy from the generator on a secondary side and to discharge said electrical energy again on a primary side at a higher voltage. The wind turbine also comprises a temperature monitoring means for the transformer. The voltage supply to the temperature monitoring means is fed from the primary side of the transformer. The temperature monitoring means is thereby independent of the control system of the wind turbine. The temperature monitoring means reduces the risk of the transformer overheating. A method for operating such a wind turbine is also disclosed.

Abstract: Provided herein is a wind energy installation including a generator for production of electrical energy, a rotor which drives the generator and has variable pitch rotor blades and a central control device, and individual pitch devices provided individually for the rotor blades. The individual pitch devices may include an adjustment drive, a communication link to the central control device and a regulator, the rotor blades being adjustable in order to slow down the wind energy installation to a shut-down position. The individual pitch devices may also include a disturbance situation detector which is designed to identify abnormal operating states and to move the rotor blades to a shut-down position. Also provided herein is the method of operating such a wind energy installation.

Abstract: A method for operating a wind farm and to a wind farm is disclosed. When a wind farm and the wind energy installations involve target values for the reactive power being prescribed by a farm regulatory device, said target values for the reactive power ignored by the control units when controlling the respective wind energy installation in the event of a power supply system fault in the power supply system. Only when the power supply system fault has been rectified are said target values considered by the control units again for controlling the respective wind energy installation.

Abstract: The invention relates to a wind power plant having a main controller. A set of condition parameters is fed to the main controller. The main controller determines settings for the operation of the wind power plant from the condition parameters. According to the invention, a minimal controller and a monitoring module are further provided. The minimal controller determines a setting for the pitch angle and/or pitch speed from a subset of the condition parameters. In the event of an error in the processing of the main controller, the monitoring module transfers the control over the wind power plant to the minimal controller. The invention further relates to a method for operating such a wind power plant. The wind power plant can be shut down in a controlled manner by means of the minimal controller according to the invention if an error occurs in the main controller.

Abstract: A method for operating a wind turbine (10). The wind turbine (10) is operated with variable rotational speed between predeterminable minimum and maximum rotational speeds. A characteristic variable (51) of an oscillation of the wind turbine (10) is detected. The wind turbine (10) includes a tower (14) and a rotor (13). An open-loop or closed-loop control device (36, 50) provides open-loop control or closed-loop control of the rotational speed of the rotor (13) between a minimum rotational speed and a maximum rotational speed during a power-supplying operation of the wind turbine. A sensor (40) detects a characteristic variable (51) of an oscillation of the wind turbine (10) and the minimum rotational speed is changed depending on the characteristic value (51) of the oscillation. The minimum rotational speed is altered depending on the characteristic variable (51) of the oscillation by the open-loop or closed-loop control device (36, 50).

Abstract: A fastening element (12) for arrangement in a receptacle of a rotor blade connection (17) of a rotor blade (5). The receptacle is formed on the rotor hub-side end of the, preferably flange-free, rotor blade (5). The fastening element (12) is arranged in the receptacle between an inner fastening side and an outer fastening side of the rotor blade (5) and the fastening element (12) introduced into the receptacle (10) is connected to the inner fastening side and the outer fastening side of the rotor blade (5). The fastening element (12) is formed tapered in the longitudinal extension thereof. The fastening element (12) has a connector (15) transverse, particularly perpendicular, to the longitudinal extension for a lightning protection conductor (18) of the rotor blade (5).

Abstract: Operating a wind farm in which the power generated by the wind energy installations is fed to a power supply system via a system internal to the wind farm and via a substation is disclosed. The farm director of the wind farm can ascertain a standard target voltage value and transmit it to the control units of the individual wind energy installations on the wind farm, which can use an overall factor to regulate the reactive power generated by a wind energy installation. The overall factor can be calculated from the difference between the actual voltage across the wind energy installation and the target voltage value, multiplied by a gain factor. On account of the impedance in the internal system of the wind farm, wind energy installations situated far away from the substation thus generate less reactive power than the wind energy installations which are situated close to the substation.