Dynamic loads in wind farms. Analysis of wind spectra, coherence functions and integral length scales of the turbulence
report
The Department of Fluid Dynamics of TNO Environmental and Energy Research has contributed to the CEC JOULE project Dynamic Loads in Wind Farms. The Dutch Electricity Generating Board SEP has cosponsored the TNO contribution to this project. The main aim ofthis project was to quantify the level of increase in the loads which wind turbines experience when operating in wind farms. Especially the variation in loads as a function of spacing and position has been studied. TNO has calculated the variation of wind farm power with wind speed and wind direction with their model FARMS. The results have been compared with the power variations measured in the Dutch Experimental Wind Farm at Sexbierum. One can conclude that FARMS predict the variation of power within wind farms over a wide range of ambient conditions with a reasonable degree of accuracy. The largest part ofthe TNO contribution consisted ofthe analysis ofwind speed data in order to provide input data for the calculation of wind turbine loads. The wind speed data have been derived from the Sexbierum Wind Farm and concern both mean and fluemating values of wind speed and wind direction for the following simations: — undisturbed flow; — at 7D in a single wake; — at 4D in a single wake.
Topics
TNO Identifier
253469
Publisher
TNO
Collation
55 p.
Place of publication
Apeldoorn