A Comparison of Wind Turbine Load Statistics for Inflow Turbulence Fields based on Conventional Spectral Methods and Large Eddy Simulation

摘要

Efficient spatial and temporal resolution of simulated inflow velocity fields is important in order to derive wind turbine load statistics for design. There are not many published studies that have addressed the issue of such optimal space-time resolution. This study investigates turbine extreme and fatigue load statistics for a utility-scale 5MW wind turbine. Load statistics, spectra, and time-frequency analysis representations are compared for various alternative space and time resolutions employed in inflow turbulence field simulation. Conclusions are drawn regarding adequate resolution in space of the inflow turbulence simulated on the rotor plane prior to extracting turbine load statistics. Similarly, conclusions are drawn with regard to what constitutes adequate temporal filtering to preserve turbine load statistics. This first study employs conventional Fourier-based spectral methods for simulating velocity fields for neutral atmospheric stability conditions.