Reconstructing the intermittent dynamics of the torque in wind turbines

The Science of Making Torque from Wind 2014

Lind, Pedro G.^1 ; Wächter, Matthias^1 ; Peinke, Joachim^1

ForWind-Center for Wind Energy Research, Institute of Physics, Carl-von-Ossietzky University of Oldenburg, DE-26111 Oldenburg, Germany^1

关键词: Dynamical coupling;    Evolution equations;    Load measurements;    Multivariate data;    Off-shore wind energy;    Power production;    Stochastic differential equations;    Wind energy converters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/524/1/012179/pdf
DOI  :  10.1088/1742-6596/524/1/012179

来源: IOP

【 摘 要 】

We apply a framework introduced in the late nineties to analyze load measurements in off-shore wind energy converters (WEC). The framework is borrowed from statistical physics and properly adapted to the analysis of multivariate data comprising wind velocity, power production and torque measurements, taken at one single WEC. In particular, we assume that wind statistics drives the fluctuations of the torque produced in the wind turbine and show how to extract an evolution equation of the Langevin type for the torque driven by the wind velocity. It is known that the intermittent nature of the atmosphere, i.e. of the wind field, is transferred to the power production of a wind energy converter and consequently to the shaft torque. We show that the derived stochastic differential equation quantifies the dynamical coupling of the measured fluctuating properties as well as it reproduces the intermittency observed in the data. Finally, we discuss our approach in the light of turbine monitoring, a particular important issue in off-shore wind farms.