CORDIS proporciona enlaces a los documentos públicos y las publicaciones de los proyectos de los programas marco HORIZONTE.
Los enlaces a los documentos y las publicaciones de los proyectos del Séptimo Programa Marco, así como los enlaces a algunos tipos de resultados específicos, como conjuntos de datos y «software», se obtienen dinámicamente de OpenAIRE .
Resultado final
The basic idea for the current project is to have a laser anemometer mounted on top of the nacelle. The laser anemometer is remotely measuring the wind velocity in front of the turbine by scattering laser light from the airborne aerosols. The measurement will automatically be in the upstream direction, as the nacelle will always - by means of a yawing system - be pointing towards the wind direction. Three main purposes of the project are addressed: Design and build such a laser anemometer, including assessment of the end production costs and reliability into the design considerations. Analysis both theoretically and experimentally, of the application of the laser anemometer wind measurements for improving the operation of wind turbines. And, analysis of the use of the laser anemometer as a substitution for the masts with cup anemometers for performing power curve and other test measurements.
The main outputs of the project are:
- A ''demonstrator'' of a dedicated, fairly inexpensive laser anemometer for test of operational principles and quality of measurements.
- Theoretical model(s) of the wind flow in front of the wind turbine.
- Analyses of the task and problems related to controlling a wind turbine using a laser anemometer, to provide a decision basis for the possibilities of using the laser anemometer.
Risø National Laboratory has gained experience with laser anemometry through systems built for plasma physics research under the nuclear fusion programme. The laser anemometer, built during the current project, focuses a single laser beam through the region where the wind velocity is to be measured. The wind velocity along the laser beam is measured from the Doppler shift of the light, scattered backwards from the elongated region where the laser beam is focused. Due to cost considerations, the detection method implemented does not allow the laser anemometer to tell velocities toward the instrument from velocities away from the instrument. The laser beam is assumed to always be pointing against the wind direction.
An investigation was conducted with the aim of providing a measured up-stream wind speed for control purpose. A set of measurements was made with a mast cup-anemometer. The investigation was concentrated on finding the standard and maximum deviation between the wind speed measured with the laser anemometer, and the actual wind speed that the turbine was subjected to. In the investigation the following main themes were included: Deviation within the averaging time of the measured signal; deviation due to lack of correlation between the measured wind speed and the significant wind speed at the rotor and deviation due to the influence from control system response time. To provide comparison data for methods competitive to the up-stream measuring method, a persistency method based on the nacelle cup-anemometer wind speed, and the same based on the turbine power were included in the comparison.
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