Abstract
The power production of the Lillgrund wind farm is determined numerically using large-eddy simulations and compared
with measurements. In order to simulate realistic atmospheric conditions, pre-generated turbulence and wind shear are
imposed in the computational domain. The atmospheric conditions are determined from data extracted from a met mast,
which was erected prior to the establishment of the farm. In order to allocate most of the computational power to the
simulations of the wake flow, the turbines are modeled using an actuator disc method where the discs are imposed in
the computational domain as body forces which for every time step are calculated from tabulated airfoil data. A study of
the influence of imposed upstream ambient turbulence is performed and shows that higher levels of turbulence results
in slightly increased total power production and that it is of great importance to include ambient turbulence in the
simulations. By introducing ambient atmospheric turbulence, the simulations compare very well with measurements at
the studied inflow angles. A final study aiming at increasing the farm production by curtailing the power output of the
front row turbines and thus letting more kinetic energy pass downstream is performed. The results, however, show that
manipulating only the front row turbines has no positive effect on the farm production, and therefore, more complex
curtailment strategies are needed to be tested. Copyright © 2014 John Wiley & Sons, Ltd.
Original language | English |
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Journal | Wind Energy |
Volume | 18 |
Issue number | 3 |
Pages (from-to) | 449–467 |
Number of pages | 19 |
ISSN | 1095-4244 |
DOIs | |
Publication status | Published - 2015 |
Keywords
- Large-eddy simulation
- Actuator disc
- Wind farms
- Power estimation
- Wakes