Abstract: Provided is a method of controlling wind turbine converters of wind turbines parallel connected at a point of common coupling, the method including: generating for each converter within a same length of a pulse width modulation period a pulse, wherein the pulses start for different converters at different pulse start phases, wherein pulse start phase differences of the pulse start phases between at least two of adjacent converters are unequal.

Abstract: Provided is a method of controlling wind turbine converters of wind turbines parallel connected at a point of common coupling, the method including: generating for each converter within a same length of a pulse width modulation period a pulse, wherein the pulses start for different converters at different pulse start phases, wherein pulse start phase differences of the pulse start phases between at least two of adjacent converters are unequal.

Abstract: A method is disclosed for deburring components or workpieces (7) with ultrasound by using at least one sonotrode (6), having the following method steps: a) supplying at least one ultrasonic transducer (4) with electrical energy by at least one ultrasound generator (2) so that the ultrasonic transducer (4) is caused to vibrate mechanically; b) transmitting the vibrations to the sonotrode (6) that is mechanically connected to the ultrasonic transducer (4); c) immersing the sonotrode (6) with at least one vibrating sonotrode surface (6?) into a fluid (M) so that cavitation is generated in the fluid (M) in an area of this sonotrode surface (6?) by the mechanical vibrations of the sonotrode (6); d) arranging a workpiece (7) to be deburred in the vicinity of this sonotrode surface (6?) by which the workpiece (7) is deburred on at least one point, side, or surface opposite the sonotrode surface (6?). Furthermore, a device is disclosed for deburring components or workpieces (7) using ultrasound.

Abstract: A device for servicing an aircraft on the ground includes: a steerable carriage; a first reel mounted along a first lateral side of the steerable carriage for unwinding a first hose or a cable onto a ground surface, wherein the first hose or a cable has a drop off point near this first lateral side; and a second reel mounted along a second lateral side of the steerable carriage for unwinding a second hose or a cable onto the ground surface, wherein the second hose or a cable has a drop off point near this second lateral side. A control system controls the unwinding speed of the cable or hose from of each of the reels in such a way that in a curve, the control system makes the outer reel unwind faster than the inner reel.

Abstract: A method is provided for testing a wind turbine installation in respect of riding through a voltage dip. As per the method, a voltage dip is simulated and measured data is obtained on the performance of the wind turbine installation based on the simulated voltage dip. The measured data obtained is analyzed regarding variables defined in performance requirements and their permitted values. The measured data is combined to form a measured dataset in a standardized measured data format. The measured dataset is forwarded to an automatic analysis unit which stores evaluation criteria. The analysis unit performs the tasks of deriving values for the variables defined in the performance requirements from the measured data, comparing the values of the variables with the permitted values contained in the performance requirements, performing an evaluation of the comparison according to the stored evaluation criteria and keeping the result of the evaluation ready for output.

Abstract: A method is provided for testing a wind turbine installation in respect of riding through a voltage dip. As per the method, a voltage dip is simulated and measured data is obtained on the performance of the wind turbine installation based on the simulated voltage dip. The measured data obtained is analyzed regarding variables defined in performance requirements and their permitted values. The measured data is combined to form a measured dataset in a standardized measured data format. The measured dataset is forwarded to an automatic analysis unit which stores evaluation criteria. The analysis unit performs the tasks of deriving values for the variables defined in the performance requirements from the measured data, comparing the values of the variables with the permitted values contained in the performance requirements, performing an evaluation of the comparison according to the stored evaluation criteria and keeping the result of the evaluation ready for output.

Abstract: An arrangement is provided for testing an electric power generation system, such as a wind turbine system, which is connected to a utility grid providing a predetermined first voltage. The arrangement includes an input terminal for connecting the arrangement to an output terminal of the power generation system. The arrangement also includes a grid terminal for connecting the arrangement to the utility grid. The arrangement further includes a transformer temporarily connectable between the input terminal and the grid terminal. The transformer is adapted to transform the first voltage to a second voltage which is different from the first voltage. The arrangement also includes a measurement system for measuring a current flow through the input terminal.

Abstract: An arrangement is provided for testing an electric power generation system, for example, a wind turbine system, which is to be connected to a utility grid having a predetermined first impedance. The arrangement includes an input terminal for connecting the arrangement to an output terminal of the power generation system. The arrangement further includes a grid terminal for connecting the arrangement to the utility grid. The arrangement further includes an electrical adjustment system connected between the input terminal and the grid terminal. The electrical adjustment system is adapted to adjust an impedance at the input terminal to the predetermined first impedance, when an auxiliary grid having a second impedance different from the first impedance is connected at the grid terminal. A corresponding method is also provided.

Abstract: A method of integrating a machine or installation into an engineering/control system within the facility, such as an automation system, comprises the steps of receiving a definition or specification for applicable standards for communication between the engineering/control system within the facility and the machines or installations; manufacturing or providing a communication interface unit comprising enhanced interfaces to fulfill the definition or specification and adapting the communication interface unit to the definition or specification; providing the communication interface unit to a machine or installation manufacturer for manufacturing the machine or installation; delivering the machine or installation and the communication interface unit to the facility; and integrating the machine or installation equipped with the communication interface unit within the facility.

Abstract: Local tissue areas should be thermally destroyed when using ultrasound thermotherapy. Traditionally, mono-frequency continuous wave ultrasound signals are used to this end. These lead to a non-optimal distribution of heat or to a non-optimal localization of the heating inside the tissue. In practice, the following dosage problem arises: the prevention of unwanted tissue damage in the tissue located in front of the target area while simultaneously having a sufficiently high damaging effect in the target area. The aim of the invention is to optimize the distribution of heat or to increase the localization of the heating. To these ends, modified transmitted signals (e.g. multi-frequency signals) are used that are adapted to a specific utilization of the non-linear ultrasound propagation and attenuation properties inside the tissue.

Abstract: Local tissue areas should be thermally destroyed when using ultrasound thermotherapy. Traditionally, mono-frequency continuous wave ultrasound signals are used to this end. These lead to a non-optimal distribution of heat or to a non-optimal localization of the heating inside the tissue. In practice, the following dosage problem arises: the prevention of unwanted tissue damage in the tissue located in front of the target area while simultaneously having a sufficiently high damaging effect in the target area The aim of the invention is to optimize the distribution of heat or to increase the localization of the heating. To these ends, modified transmitted signals (e.g. multi-frequency signals) are used that are adapted to a specific utilization of the non-linear ultrasound propagation and attenuation properties inside the tissue.

Abstract: A method of integrating a machine or installation into an engineering/control system within the facility, such as an automation system, comprises the steps of receiving a definition or specification for applicable standards for communication between the engineering/control system within the facility and the machines or installations; manufacturing or providing a communication interface unit comprising enhanced interfaces to fulfill the definition or specification and adapting the communication interface unit to the definition or specification; providing the communication interface unit to a machine or installation manufacturer for manufacturing the machine or installation; delivering the machine or installation and the communication interface unit to the facility; and integrating the machine or installation equipped with the communication interface unit within the facility.