Abstract: A wind energy installation includes a rotor, a generator driven by the rotor, and a converter for generating electrical power which is output into a power supply system via a transformer. The installation also includes an open-loop control system having an open-loop converter control unit. The open-loop control system supplies an actuating signal for a reactive component to the converter. The installation further includes a voltage measurement device arranged on the transformer. The voltage signal of the voltage measurement device is applied to an input of a state-dependent setpoint value shifter, whose output signal is applied to a limitation module for the reactive component acting on the converter. With this configuration, the installation can be better protected and the transformer can be better utilized.

Abstract: A gear box (122) of a wind power plant, in particular a multi-stage gear box (122) of a wind power plant, wherein the gear box (122) includes a gear box housing (125). Furthermore, a wind power plant and use of a work instrument. The gear box (122) is further developed in that at least one access opening for the insertion of a work instrument into the gear box housing (125) or respectively into the interior of the gear box housing (125) is provided on the outside of the gear box housing (125) and in that at least one guiding means (201, 202, 203, 204, 205) is provided for the work instrument inside the gear box housing (125) so that the work instrument is moveable and/or positionable within the guiding means (201, 202, 203, 204, 205), wherein in particular parts of the gear box (122) in the gear box housing (125) are checked and/or worked by means of the work instrument inserted or arranged or arrangeable in the guiding means (201, 202, 203, 204, 205).

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: A method for controlling a converter of a wind energy installation. The converter is connected to a rotor of a doubly-fed asynchronous generator for feeding electrical power into an electrical grid and comprises a generator-side inverter, a grid-side inverter, and at least one converter regulator for regulating and/or controlling currents emitted from at least one of the inverters to at least one of the generator and the electrical grid. The method includes detecting a change in electrical voltage present in at least one of emitted real currents and emitted reactive currents at one of the inverters, determining whether the detected change corresponds to a predetermined change, and changing nominal values of at least one of real currents to be emitted and reactive currents to be emitted from the other inverter if the detected change corresponds to the predetermined change.

Abstract: A method for controlling a converter of a wind energy installation. The converter is connected to the rotor of a doubly-fed asynchronous generator in order to feed electrical power into an electrical grid and comprises a generator-side inverter, a grid-side inverter, and at least one converter regulator for regulating and/or controlling current output from at least one of the inverters to the doubly-fed asynchronous generator and/or to the electrical grid. The method includes detecting a change in output real power, determining whether the detected change satisfies a predefined condition, and changing a nominal value of reactive power to be output in an opposite sense to a change in real power at the grid-side inverter and in a same sense as the generator-side inverter when the predefined condition is satisfied.

Abstract: A system and method for operating a wind energy installation or wind farm. The system includes a control unit configured to process control variables and a transfer module. The transfer module has an input interface for receiving control commands and an output interface for transmitting control variables to the control unit. The transfer module has multiple transfer logic elements each configured to convert a control command to a control variable. The transfer module has a switching device for switching between the transfer logic elements. As a result, the wind energy installation or wind farm can be connected to an electrical grid in which the control commands are transmitted in a different format than that of the control variables of the control unit.

Abstract: A wind park includes at least two wind energy systems each comprising a generator and converter for generating electrical energy and a control system, a park master designed for active and idle power control that transmits a control signal for idle power via a communications network to the wind energy systems, and a connection network feeding generated electrical energy into a grid. The wind energy system can include an idle power regulator and a supplementary regulator, the control signals of each of which are linked together. Thus, a combination of idle power and voltage regulation is achieved that combines the advantages of each. Accordingly, the wind park can have high dynamic and stability notwithstanding erratic changes in the grid.

Abstract: A wind farm includes a plurality of wind energy installations which generate electrical energy to be output to a power supply system and a wind farm master for controlling the wind energy installations. Each wind energy installation includes a generator which is driven by a rotor, and the wind farm master includes a power control device having a plurality of loops. This plurality of loops includes a fast loop that includes a controller which acts on a first group of the wind energy installations and a slow loop that includes a controller which acts on a second group of the wind energy installations, the fast controller having a substantially higher dynamic than the slow controller.

Abstract: A method for the operation of a wind power plant (W), wherein the wind power plant (W) has a tower (T) and a rotor with at least two rotor blades (RB1, RB2, RB3) connected with the tower, wherein each rotor blade (RB1, RB2, RB3) can be adjusted or is adjusted respectively around a rotor blade axis (RA1, RA2, RA3) with a predetermined rotor blade adjustment angle (GPW) and the rotor blades (RB1, RB2, RB3) are driven in a rotating manner by external wind movements around a rotor axis pro-vided transverse to the rotor blade axes (RA1, RA2, RA3). The rotor blade adjustment angle (GPW) for each rotor blade (RB1, RB2, RB3) is changed independently and/or individually depending on the lateral oscillations of the tower such that the amplitude of the lateral oscillations of the tower (T), induced in particular through the exterior wind movements, is damped.

Abstract: A wind energy installation control device includes a wind rotor, a generator driven by the wind rotor, a torque control unit configured to control a torque of the generator, and a control system. The control system includes a detector configured to identify a grid dip and an end of the grid dip, a residual torque transmitter configured to provide a preset value for a torque of the generator after identification of the grid dip, and an initializer configured to initialize a component of the torque control unit at the preset value. Accordingly, upon return of grid power after a grid dip, the vibration behaviour of a wind power system can be significantly improved. Overload of a drive train upon return of grid voltage can thus be reduced.

Abstract: The invention relates to a method for operating a wind energy system wherein when a first settable boundary value (G1) is reached by a first parameter (M1) a process is automatically started whose course is monitored by measuring a second parameter (M2). By comparing the measured values of the second parameter (M2) with a second settable boundary value (G2), the first settable boundary value is changed upon reaching the second boundary value (G2) by the second parameter (M2).

Abstract: A network disturbance module for a control device of a wind energy installation having a generator driven by a wind rotor and a converter for producing electrical power fed into a network. The module includes a measurement device configured to measure at least one electrical parameter of the network, a detector configured to identify a network disturbance and output a switching signal, and a reference generator configured to produce a substitute reference vector for the converter based on the at least one electrical parameter. The module also includes a fault management unit comprising a fault classifier, the unit being configured to interact with the measurement device, detector, and reference generator such that, in the event of an undervoltage during island operation, a quick-action frequency regulator is activated. The regulator acts on the converter to vary a real-power feed P in the event of a discrepancy in a network frequency.

Abstract: A wind energy installation connected to a network. The installation includes a tower and a pod having a wind rotor and a generator driven by the wind rotor. The installation further includes a converter configured to output electrical power, a control device provided with a temperature sensor and a heating device, and a preheating module. The preheating module includes a thermal switch configured to monitor a temperature of at least one component of the wind energy installation and a monitoring unit having an output device. The monitoring unit operates the heating device until the thermal switch reaches a threshold, whereupon the output device transmits an enable signal to start the wind energy installation. Operational reliability of the wind energy installation in low ambient temperatures can be thus improved.

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: The invention concerns a method for operating a wind power plant (WEA), preferably before or during the performance of maintenance work on the wind power plant (WEA), wherein —at least one physical condition of the surroundings outside the wind power plant (WEA) induced by wind movement outside the wind power plant (WEA) is detected as an external physical condition, and/or at least one physical condition of a component of the wind power plant (WEA) influenced by wind movement outside the wind power plant (WEA) is detected as an internal physical condition; —the at least one external physical condition and/or at least one internal physical condition are evaluated; —the at least one external physical condition is compared with a predetermined reference value for the external physical condition, and/or the at least one internal physical condition is compared with a predetermined reference value for the internal physical condition; —depending on the comparison at least one warning message is generated, in partic

Abstract: A wind power plant is characterized in that a measurement device (18) is provided for the determination of the load on an electric motor (13, 14), wherein the control device (16, 17) reduces the load on the motor (13, 14) by reducing the rotational speed of the rotor (11), by changing the blade angle of the at least one rotor blade (12, 12?) and/or by reducing the output of the wind power plant (10) when a preselectable first load limit of the electric motor (13, 14) is exceeded.

Abstract: A method and system for monitoring the operation of a wind energy installation. State data relating to the wind energy installation is recorded and discrepancies are found between the state data and an associated comparison value. A failure probability of the wind energy installation is determined based on any found discrepancy. An availability value for the wind energy installation is determined from the ratio of the actually produced amount of electrical energy to the total amount of energy which can potentially be produced. The availability value and the failure probability are then combined to form a repair priority, which is associated with the wind energy installation. Accordingly, more uniform operation of wind energy installations can be achieved.

Abstract: An electricity generating installation is connected to an electricity distribution network and feeds electrical power into the network via a converter. After detecting a network fault, a stabilization regulator in the installation is activated. The stabilization regulator regulates the voltage of the electrical power as a function of a fed-back voltage signal and has a step-function response that rises over time. After a predetermined time period has elapsed since the activation of the stabilization regulator, the reactive current feed is increased beyond a limit which is provided for normal operation if the network has not stabilized. Accordingly, a converter-fed electricity generating installation, such as a wind energy installation, can help stabilize an electricity distribution network after a network fault.

Abstract: A connection of components (11, 12, 13) of a wind turbine (WEA), especially of components (11, 12, 13) of a wind turbine (WEA) with a diameter greater than 0.5 m, preferably greater than 1.0 m, more preferably greater than 1.5 m, in which two components (11, 12, 13) to be connected to each other each have contact areas facing toward each other, and in the connected state the components (11, 12, 13) are or become secured to each other. The connection is constituted by multiple intermediate connecting bodies (20) arranged between a first component (11; 12) of the wind turbine (WEA) and a second component (12; 13) of the wind turbine (WEA) and by designing the intermediate connecting bodies (20) with contact areas which are arranged opposite to the contact areas of the first and second component (11, 12, 13), at least one contact area of the intermediate connecting bodies (20) being provided with a coating.

Abstract: The invention concerns a method for erecting a tower of a wind power plant made of at least three tube-shaped tower segments. For this a tower segment is connected at its ends with another tower segment in each case, in which the tower segments are arranged in a predetermined sequence of the type tower segment A—tower segment B—tower segment C one upon the other, in which the first tower segment A is selected arbitrarily from a provided plurality i?2 of first tower segments Ai which are constructed in the same way among themselves and exchangeable one for the other, in which the second tower segment B is selected arbitrarily from a provided plurality m?2 of second tower segments Bm which are constructed in the same way among themselves and exchangeable one for the other, in which the third tower segment C is selected arbitrarily from a provided plurality n?2 of third tower segments Cn which are constructed in the same way among themselves and exchangeable one for the other.