Berlin 2008 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 29: Poster II
DY 29.13: Poster
Donnerstag, 28. Februar 2008, 16:00–18:00, Poster C
Dynamic Analysis of Cup Anemometer Data — •Mathias Hölzer1,2, Michael Hölling1,2, and Joachim Peinke1,2 — 1Universität Oldenburg — 2ForWind, Oldenburg
The cup anemometer is one of the most used wind measuring instruments in wind energy related context. The asymmetric form, on which its movement is based on, is the source of a systematic overestimation of the mean windspeed, the so called "Overspeeding".
The instrument inherent error is the biggest drawback of the instrument, since an error up to 10% in windspeed means an error up to 30% in wind energy output due to the cubic dependency between windspeed and energy content. Error correction methods have been devolped since the mid 1950's by a couple of authors. All these approaches yield a certain correction, but are complicated as they require additional information about the exact cup anemometer geometry.
With our new approach we treat the cup anemometer as a stochastic system with Markov properties. The dynamics of such a system can be described by the Fokker-Planck equation. By calculating the drift coefficient from the measured data it is possible to determine the correct mean wind speed. In comparison with other algorithms the presented approach leads to better results. Furthermore it is not nesesary to have additional information of the geometry of the anemometer.
The presented approach can be a considerable advance for the correct forecast of wind energy output in the future as well as for previously measured data as long as it is possible to apply the method to timeseries to correct the mean wind speed of a site.