ABSTRACT
Modelling of turbulence in wakes for load calculations tends to focus on specific cases, while power loss modelling has to encompass the full range of wind speeds and directions. The work presented is part of that being undertaken within the UpWind project that aims to develop the next generation of large wind turbines. In the part of UpWind, the performance of wind farm and wake models is being examined in offshore environments where there are very few pre-existing measurements of ambient wind and turbulence to turbine hub heights, and even fewer detailed studies of wind turbine wakes. Wind farms being developed today are larger and often in complex terrain, close to forests or offshore, and are large multi-row blocks of large 1.5–2MW turbines. S. Frandsen et al suggested that the power in an ‘infinitely large’ wind farm would reach an equilibrium value although there are currently no large wind farms offshore that can be used to evaluate a certain hypothesis.
