Abstract: A spreader tool is provided for spreading viscous material on the surface, for example an edge, of a wind turbine blade. The spreader tool comprises at least one bendable spreader wing, for example provided as a fin-ray construction, for pressing a flexible band against a curved section of the blade and for dragging viscous material along it by the flexible band during movement of the spreader tool along the blade surface. The spreader tool is advantageously part of a robot system used to work the surface of the blade.

Abstract: A dispenser tool (42) is provided with multiple cartridges for dispensing viscous material onto the surface (5?) of a wind turbine blade (5). The dispenser tool (42) is advantageously part of a robot system used to work the surface (5?) of the blade (5). The system is configured for bringing the nozzle of a selected cartridge into the vicinity of the surface (5?) and orienting the dispenser tool (42) relatively to the surface (5?) such that the nozzle (46) of the corresponding selected cartridge (44) is at the surface (5?) for providing viscous material onto the surface (5?) from the selected cartridge (44) while moving the nozzle (46) along the surface (5?).

Abstract: A spreader tool is provided for spreading viscous material on the surface (5?), for example an edge (5?), of a wind turbine blade (5). The spreader tool (52) comprises at least one bendable spreader wing (54A, 54B), for example provided as a fin-ray construction, for pressing a flexible band (53) against a curved section of the blade (5) and for dragging viscous material along it by the flexible band during movement of the spreader tool (52) along the blade (5) surface (5?). The spreader tool is advantageously part of a robot system used to work the surface (5?) of the blade (5).

Abstract: A spreader tool is provided for spreading viscous material on the surface (5), for example an edge (5?), of a wind turbine blade (5). The spreader tool (52) comprises at least one bendable spreader wing (54A, 54B), for example provided as a fin-ray construction, for pressing a flexible band (53) against a curved section of the blade (5) and for dragging viscous material along it by the flexible band during movement of the spreader tool (52) along the blade (5) surface (5?). The spreader tool is advantageously part of a robot system used to work the surface (5?) of the blade (5).

Abstract: A dispenser tool (42) is provided with multiple cartridges for dispensing viscous material onto the surface (5?) of a wind turbine blade (5). The dispenser tool (42) is advantageously part of a robot system used to work the surface (5?) of the blade (5). The system is configured for bringing the nozzle of a selected cartridge into the vicinity of the surface (5?) and orienting the dispenser tool (42) relatively to the surface (5?) such that the nozzle (46) of the corresponding selected cartridge (44) is at the surface (5?) for providing viscous material onto the surface (5?) from the selected cartridge (44) while moving the nozzle (46) along the surface (5?).

Abstract: A system, a method and a tool kit are provided including an apparatus on a wire, for example for cleaning or repairing a wind turbine blade. The apparatus includes a base and an arm, the arm extending from the base and including a remote end, the remote end and the base, each including an attachment device for securing to a surface.

Abstract: A method for controlling a wind turbine with a rotor and at least one rotor blade, and a control unit are disclosed. The method is characterized in adjusting a pitch angle of the rotor blade and determining the limit of an input value based on the adjusted pitch angle, wherein the input value includes information about the turbine rotational speed.

Abstract: A method to control the operation of a wind turbine above a wind speed threshold value and a wind turbine designed to execute the method are provided. Electrical output power of the wind turbine is produced by its rotating blades and fed into a grid, which is connected with the wind turbine. The wind turbine is controlled by a first control loop and a second control loop. The wind speed is determined and compared with a certain predefined wind speed threshold value. Wind turbulences are determined and compared with a predefined wind turbulence threshold value. The first control loop and the second control loop are activated when the wind speed reaches or exceeds the wind speed threshold value. The activated first control loop controls the output power dependent on the wind speed. The activated second control loop controls the rotational speed of the rotating blades dependent on the wind turbulences.

Abstract: A method to control the operation of a wind turbine above a wind speed threshold value and a wind turbine designed to execute the method are provided. Electrical output power of the wind turbine is produced by its rotating blades and fed into a grid, which is connected with the wind turbine. The wind turbine is controlled by a first control loop and a second control loop. The wind speed is determined and compared with a certain predefined wind speed threshold value. Wind turbulences are determined and compared with a predefined wind turbulence threshold value. The first control loop and the second control loop are activated when the wind speed reaches or exceeds the wind speed threshold value. The activated first control loop controls the output power dependent on the wind speed. The activated second control loop controls the rotational speed of the rotating blades dependent on the wind turbulences.

Abstract: A method for determining a total mechanical load of a wind turbine is provided. A present load signal indicative of a present load of a wind turbine base structure is obtained, wherein the present load acts in a present angular direction. A first present load and a second present load are derived based upon the present load signal and the present angular direction, wherein the first present load is associated with a first angular sector of the turbine and the second present load is associated with a second angular sector of the turbine. Further, a total mechanical load is derived based upon the first present load and the second present load.

Abstract: A method of controlling the load of a wind turbine is provided. A rate of wear experienced by the wind turbine as a result of the current operating conditions of the wind turbine is determined. A control vector for controlling the wind turbine is determined based on the determined rate of wear. The load of the wind turbine is controlled in accordance with the determined control vector. Determining the control vector includes weighting the determined rate of wear by a cost of electricity value and determining the control vector based on the weighted rate of wear.

Abstract: A method for controlling a wind turbine with a rotor and at least one rotor blade, and a control unit are disclosed. The method is characterised in adjusting a pitch angle of the rotor blade and determining the limit of an input value based on the adjusted pitch angle, wherein the input value includes information about the turbine rotational speed.

Abstract: An arrangement for generating a control signal for controlling a power output of a power generation system is described. The power output is to be supplied to a utility grid, the arrangement includes an input terminal for receiving an input signal indicative of an actual grid frequency of the utility grid; a control circuit for generating the control signal wherein the control circuit comprises a first circuit for generating a time derivative value of the input signal; and an output terminal to which the control signal is supplied, wherein the control signal depends on the generated time derivative value of the input signal. Further a power generation system is described.

Abstract: A method for determining a total mechanical load of a wind turbine is provided. A present load signal indicative of a present load of a wind turbine base structure is obtained, wherein the present load acts in a present angular direction. A first present load and a second present load are derived based upon the present load signal and the present angular direction, wherein the first present load is associated with a first angular sector of the turbine and the second present load is associated with a second angular sector of the turbine. Further, a total mechanical load is derived based upon the first present load and the second present load.