Wobben Properties GmbH

The present disclosure is directed to a method for determining loads on wind turbines. The method includes creating a grid structure with grid points from randomly varied wind conditions as parameters, the wind conditions including one or more of a turbulence, a turbulence intensity, and a wind shear, performing load simulation of a wind turbine for each of the grid points, providing a prediction model for predicting loads based on wind conditions, training the prediction model based on the load simulation for each of the grid points, and determining the loads for any combination of wind conditions using the prediction model.

The present disclosure is directed to methods, systems, and computer-readable media for evaluating performance of a wind turbine using, a training data set. In one aspect, a method includes clustering a plurality of wind turbines with a trained machine learning algorithm into a plurality of clusters of wind turbines, acquiring the at least one site specific parameter for the wind turbine, identifying a specific cluster from the plurality of clusters with comparable conditions to the wind turbine based on the at least one site specific parameter of the wind turbines comprised in the specific cluster and the at least one site specific parameter of the wind turbine, determining a cluster performance index of the specific cluster based on the at least one power production parameter of the wind turbines comprised in the specific cluster, evaluating the performance of the wind turbine.

Provided is a method for controlling an electric generator of a wind turbine. The method includes varying an amplitude and/or phase angle of an harmonic current of said electric generator, while said electric generator is rotating, in particular at a known condition, measuring a signal indicative of generator vibration after and/or during varying said amplitude and/or phase angle, repeating said varying and said measuring until a predetermined requirement is met, evaluating an operating point for said electric generator by using said measured signals indicative of generator vibration in order to reduce a ripple torque of said generator, and controlling a current, in particular said harmonic current, of said electric generator in order to meet said operating point.

A generator repair method includes decoupling the first and second connections of a defective former-wound coil from two other former-wound coils; separating the first and second coil heads of the defective coil; opening a slot closing wedge that closes a first slot into which a first leg of the defective coil is inserted; removing the first leg of the defective coil from the first slot; inserting a first leg of a new coil with an electrical conductor made of copper or aluminum; inserting a new slot closing wedge into the first slot, wherein the first slot is closed by the new slot closing wedge in the direction of the air gap existing between the stator and rotor in the operating state; inserting resin into the first slot; connecting the first leg to a second leg; and coupling the first and second connections of the new and the two other coils.

A method for calibrating a measuring device for measuring the load on a rotor blade of a wind power installation is disclosed. At least one conversion factor for converting a detected sensor value of a load sensor into a load value acting on the rotor blade is determined for each rotor blade, a sensor value is recorded by the load sensor, and the conversion factor is determined from a relationship between a load value and a load value acting on the rotor blade A sensor value is recorded by the load sensor, and the conversion factor is calculated from a relationship between the sensor value and the comparative force acting on the rotor blade. The comparative force is calculated based on a weight force acting on the rotor blade, and is determined based on a deviation between the comparative force and the weight force.

The present disclosure relates to a method for controlling an electrical generator of a wind turbine, the generator having a rotor and a stator, and the stator being controlled by a stator current. The stator current has a main component being characterized by a fundamental signal with a fundamental frequency and a fundamental phase angle, and a fractional harmonic current component being characterized by a fractional harmonic signal having a fractional harmonic frequency and a fractional harmonic phase angle. The method includes providing a compensation current having a compensation amplitude and a compensation phase angle, and determining the compensation phase angle depending on an absolute rotational position of the rotor.

A testing device for simultaneously testing two rotor blades and/or two rotor blade segments for a wind power installation, to a method for simultaneously testing two rotor blades and/or two rotor blade segments for a wind power installation, to a method for testing a rotor blade and/or a rotor blade segment for a wind power installation, and to the use of a testing device for testing a rotor blade and/or a rotor blade segment for a wind power installation and/or for simultaneously testing two rotor blades and/or two rotor blade segments for a wind power installation. The testing device comprises a first adapter element for fastening thereto a first rotor blade or rotor blade segment, a second adapter element for fastening thereto a second rotor blade or rotor blade segment, a support structure to which the first and the second adapter element are fastened so as to be rotatable about a common rotation axis, an excitation device which is configured to apply a static and/or cyclic load to the first and/or the second rotor blade or rotor blade segment, wherein the first and the second adapter element are connected to each other.

The present disclosure relates to a method of optimizing a rotor blade of a wind turbine, wherein said rotor blade extends from a rotor-blade coupling to a rotor-blade tip in a rotor-blade longitudinal direction with a rotor-blade length, having an aerodynamical profile extending between a leading edge and a trailing edge, wherein said method comprises the following steps: designing of said rotor blade for design environmental conditions including at least one design air density, with said designing comprising providing a sound-protection means, the sound protection means comprising at least one bristle, within a blade external region of said rotor blade the latter being defined as the 50% of said rotor-blade length abutting said rotor-blade tip; providing an air density at the installation site of said wind turbine; comparing said air density with said design air density; and increasing the induction factor by increasing a density factor of said sound-protection means when said air density is lower than said design air density.

Provided is a method for detecting a power loss when operating a wind power system including a wind power installation and which feeds electrical power into a grid. The electrical power is fed into the grid with an active and reactive power component at a current operating point. The method includes detecting an overall power loss caused by feeding in the electrical power at the current operating point, and estimating a reactive power loss caused by feeding in the reactive power component at the current operating point. The reactive power loss is determined from a difference between the overall power loss and an active power loss assigned to the current operating point. The active power loss corresponds to a power loss of a comparison operating point where the same amount of active power is fed in as at the current operating point, but no reactive power is fed in.

In one aspect, an electrical grid for an isolated hybrid power plant includes a first grid section configured to be connected to at least one wind power installation, be connected to at least one gas production installation, and transport an electrical power generated by the wind power installation to the at least one gas production installation; a second grid section configured to be connected to the at least one gas production installation; and a grid converter configured to electrically connect the first grid section and the second grid section to one another and bidirectionally exchange electrical power between the first electrical grid section and the second electrical grid section.