Berlin 2015 – scientific programme

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AKE: Arbeitskreis Energie

AKE 15: Energy Systems (joint session DY/ AKE /SOE)

AKE 15.11: Talk

Thursday, March 19, 2015, 12:15–12:30, BH-N 243

Short-Time Stochastic Characterization of the Offshore Wind Profile — •Christian Behnken, Pedro Lind, Matthias Wächter, and Joachim Peinke — ForWind, Institute of Physics, Carl-von-Ossietzky University, 26111 Oldenburg, Germany

Currently descriptions of vertical wind profiles are mostly performed by using standard logarithmic or power law approaches. Especially for short time scales (1 s ≤ t ≤ 10 min) the dynamics of the profile strongly influence the load situations and the energy conversion of wind turbines. Since these short-time dynamics are not considered when using the standard techniques, a more detailed approach is presentend in this work. Firstly, PDFs of spatial and temporal velocity increments, estimated from offshore wind speed data, are fitted by using a superposition of Gaussian distributions with a varying standard deviation. It is shown that the empirical PDFs follow a heavy-tailed distribution which matches the proposed theoretical distribution. Furthermore, drift and diffusion coefficients for two-dimensional systems of Langevin equations are estimated directly from wind speed data to investigate dynamic coupling along the profile. This approach gives a first insight into the dynamics of wind profiles on short time scales.