A method and system of fatigue testing a wind turbine blade using a test system. The test system includes a test stand to which the wind turbine is fixed. A first excitation unit is connected to the wind turbine blade and used to introduce loadings in the flapwise direction. A second excitation unit is connected to the wind turbine blade and used to introduce loadings in the edge wise direction. A load controllable unit is further connected to the wind turbine blade and used to adjust the resonant frequency of the test system. Loadings in the flapwise and edgewise directions are introduced at the same resonant frequency and the loadings are measured using a number of detector units. The control unit monitor and control the amplitude of the first and second harmonic motions and the phase between the first and second harmonic motions.

The present application discloses a blade fault diagnosis method, apparatus and system, and a storage medium, the method includes: acquiring a blade rotation audio collected by an audio collection device during operation of a wind turbine generator system; preprocessing the blade rotation audio based on a wind noise filtering algorithm to obtain a blade rotation audio filtered out of wind noise; dividing the blade rotation audio filtered out of wind noise to obtain audio segments corresponding to blades of the wind turbine generator system respectively; diagnosing, based on the audio segments, whether the blades each corresponding to one of the audio segments are faulty. The present application can diagnose whether a corresponding blade is faulty respectively according to the audio segments of different blades, which improves the accuracy of the diagnosis results.

A method for improving quality of a rotor blade of a wind turbine includes receiving, via a data acquisition module of a controller, image data relating to the rotor blade. The image data is collected during or after manufacturing of the rotor blade before the rotor blade is placed into operation on the wind turbine. The method includes identifying, via a processor of the controller, an anomaly on the rotor blade using the image data relating to the rotor blade. The method also includes determining, via the processor, a location of the anomaly of the rotor blade using a combination of at least two of the following: an estimated location of an imaging device when the image data was collected, a known location of a pixel as represented by multiple angles that describe a location of the pixel and the anomaly within the image data as projected onto a spherical shell, Light Detection and Ranging (LIDAR) data of a cross section of the rotor blade at a time and location when the image data was collected, a specific internal cavity that the imaging device is in when the image data was collected, or a computer-aided design (CAD) model of the rotor blade. Further, the method includes displaying, via the processor, the location of the anomaly of the rotor blade. Moreover, the method includes implementing, via the processor, a corrective action for a subsequent manufacturing process of another rotor blade based on the location of the anomaly of the rotor blade.

The method is for operating a wind turbine having a rotor with at least one rotor blade, a tower and a pitch setting system. The method includes providing first information which is representative for the tilt bending moment acting on the rotor. Second information which is representative for the thrust force acting on the rotor is provided. Third information which is representative for a critical area of thrust forces and tilt bending moments is provided. Fourth information is determined depending on the first, the second and the third information. The fourth information is representative for whether the tilt bending moment and the thrust force lie within the critical area. If this is the case, an output signal is generated which is configured to cause the pitch setting system to change the pitch angle of the at least one rotor blade in order to leave the critical area.

A method of estimating a position of at least a part of a rotor blade of a rotor of a wind turbine during operation of the wind turbine is provided. The rotor blade is deflected due to a deflection motion of the rotor blade towards a tower of the wind turbine and the position is indicative of the deflection. The method includes measuring a first parameter indicative of an absolute and/or a relative position of at least a second part of the rotor blade or of a further rotor blade of the rotor. The method further includes measuring second parameters indicative of an absolute and/or a relative position of at least a third part of the rotor blade or of the further rotor blade of the rotor. The method further includes estimating a state of the rotor blade and deriving the position from the estimated state of the rotor blade.

The method is for operating a wind turbine having a rotor with at least one rotor blade and a setting system which is configured to change the operation of the wind turbine. The method includes a step in which first trigger information is provided, wherein the first trigger information is representative of whether the torsional movement of at least one rotor blade exceeds a threshold. If this is the case, a first output signal is generated which is configured to cause the setting system to change the operation of the wind turbine to reduce the torsional movement of the at least one rotor blade.

Provided are a panoramic stitching method for infrared images of a wind turbine blade, a device, a storage medium, and a product. The stitching method includes: performing coarse registration on each frame of visible image and infrared image; separately performing background subtraction on a coarsely-registered visible image and a coarsely-registered infrared image to obtain a foreground mask visible image, a foreground mask infrared image, a background-subtracted blade visible image, and a background-subtracted blade infrared image; performing fine registration on the foreground mask visible image and the foreground mask infrared image to obtain a relative displacement; stitching a plurality of frames of blade visible images to obtain a pixel increment; calculating a pixel increment when two adjacent frames of blade infrared images are stitched; and stitching two corresponding adjacent frames of background-subtracted blade infrared images, to obtain an infrared panoramic image of the wind turbine blade.