ECN publication
UPWIND METROLOGY. Deliverable D1A2.1 List of Measurement Parameters
Published by: Publication date:
ECN Wind Energy 14-2-2007
ECN report number: Document type:
ECN-E--07-015 ECN publication
Number of pages: Full text:
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The UPWIND project is a European research project that focuses on the necessary up-scaling of wind energy in 2020. Among the problems that hinder the development of wind energy are measurement problems. For example: to experimentally confirm a theoretical improvement in energy production of a new design by field experiments of around 5% is very hard to almost impossible. As long as convincing field tests have not confirmed the actual improvement, the industry will not invest much to change the turbine design. This is an example that clarifies why the development of wind energy is hindered by metrology problems (measurement problems). Other examples are in the fields of: • Warranty performance measurements • Improvement of aerodynamic codes • Assessment of wind resources In general terms the uncertainties of the testing techniques and methods are typically much higher than the requirements. Since this problem covers many areas of wind energy, the work package is defined as a crosscutting activity. The problem is especially relevant for the follow-ing areas: Production related • Power performance testing especially in wind farms • Testing and verification of turbine improvements in the order of several percent • Verification of aerodynamic codes • Testing and verification of turbine response to effects such as turbulence and shear Load related • Mechanical load measurements in farms aimed at verification of aero elastic codes. (blade root moments, yaw moments, tower foot moments etc.) Wind related • Measurement of wake effects and wind resources inside wind farms • Measurements of inter farm effects (regarding velocity profiles, turbulence, surface shear recovery distances etc) • Measurements of the interaction wind farms and microclimate The objectives of the metrology work package are to develop metrology tools in wind energy to significantly enhance the quality of measurement and testing techniques. The development of the basic metrology measures is done by • Identifying all relevant measurands within the wind energy community • Describing their definition in detail • Identifying all relevant influence parameters • Quantifying their systematic influence on measurements • Specifying traceability and • Applying advanced uncertainty analysis methods. This report presents a state of the art assessment to identify all relevant measurands. The re-quired accuracies and required sampling frequencies are stated from the perspective of the users of the data (the other work packages in UPWIND). The interaction with the other work pack-ages has initiated internal debates which led to feedback to this list of measured parameters.

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