Abstract
Efficient spatial and temporal resolution of simulated inflow wind fields is important in order to represent wind turbine dynamics and derive load statistics for design. Using Fourier-based stochastic simulation of inflow turbulence, we first investigate loads for a utility-scale turbine in the neutral atmospheric boundary layer. Load statistics, spectra, and wavelet analysis representations for different space and time resolutions are compared. Next, large-eddy simulation (LES) is employed with space-time resolutions, justified on the basis of the earlier stochastic simulations, to again derive turbine loads. Extreme and fatigue loads from the two approaches used in inflow field generation are compared. On the basis of simulation studies carried out for three different wind speeds in the turbine’s operating range, it is shown that inflow turbulence described using 10-meter spatial resolution and 1 Hz temporal resolution is adequate for assessing turbine loads. Such studies on the investigation of adequate filtering or resolution of inflow wind fields help to establish efficient strategies for LES and other physical or stochastic simulation needed in turbine loads studies.
Highlights
No systematic studies have been conducted to date that have addressed the issue of efficiency of spatio-temporal resolution in generating inflow velocity fields for purposes of estimating accurate load statistics for today’s large utility-scale wind turbines
Such space-time resolution may be justified in flow field generation using either stochastic simulation or large-eddy simulation (LES)
Turbine loads under inflow turbulence generated by different simulation techniques (LES versus stochastic) were compared
Summary
No systematic studies have been conducted to date that have addressed the issue of efficiency of spatio-temporal resolution in generating inflow velocity fields for purposes of estimating accurate load statistics for today’s large utility-scale wind turbines. The present study addresses this issue by making use of conventional stochastic simulation of stationary Gaussian fields using Fourier methods for neutral atmospheric stability conditions These simulated wind fields have characteristics that are similar to what is required per turbine design guidelines [1]. From the study of turbine load statistics based on stochastic simulation of inflow, we establish the degree of resolution in space and time that is necessary for reasonably accurate extreme and fatigue load predictions in design. This same level of spatial and temporal resolution is employed in studies involving the use of large-eddy simulation (LES) for load computations. Load statistics from stochastic simulation and LES are compared
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