Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Multipoint reconstruction of wind speeds
 Wind energy science : WES 5 (2020), Nr.3, S.12111223 ISSN: 23667443 ISSN: 23667451 

 Englisch 
 Zeitschriftenaufsatz, Elektronische Publikation 
 Fraunhofer IWES () 
Abstract
The most intermittent behaviour of atmospheric turbulence is found for very short timescales. Based on a concatenation of conditional probability density functions (cpdf's) of nested wind speed increments, inspired by a Markov process in scale, we derive a shorttime predictor for wind speed fluctuations around a nonstationary mean value and with a corresponding nonstationary variance. As a new quality this shorttime predictor enables a multipoint reconstruction of wind data. The used cpdf's are (1) directly estimated from historical data from the offshore research platform FINO1 and (2) obtained from numerical solutions of a family of Fokker–Planck equations in the scale domain. The explicit forms of the Fokker–Planck equations are estimated from the given wind data. A good agreement between the statistics of the generated and measured synthetic wind speed fluctuations is found even on timescales below 1 s. This shows that our approach captures the shorttime dynamics of real wind speed fluctuations very well. Our method is extended by taking the nonstationarity of the mean wind speed and its nonstationary variance into account.