Wake calculation by multiple masts

[Gil]

Dear Team,

I have two masts at the site and more than 20 wind turbines are planned. during test simulation i found out wake calculations by two different masts are quite different and in the end energy level differences are also high. i have not used default settings of wake settings in PARK2 but try to adjust and simulate. one parts of turbine groups are close to mast 1 and another groups are close to mast 2. the elevation difference between mast 1 and 2 are almost 200m asl. that is why I considered it makes more sense to separate two groups. however, all wind turbines should be considered as a whole. Are there any way to calculate wakes by applying different wake parameters in a wind farm? i am thinking to make the results separately and merge together. but in this case, i should consider again the wake by each group. it would be great if you could advise me how to apply in WAsP.

regards,

Gyeongil

[Morten]

Hi Gil, 

The WAsP wake model applies global parameters for the entire wind farm. Right-click the main turbine site group and click the 'Edit' button to modify them.  

You can use the observed wind climates for two masts if you arrange the WAsP project as in the attached screen dump. Here, I inserted two nested turbine groups as child objects to the wind farm and sorted the turbine sites for their most representative met mast. I inserted two wind climates, one for each mast, and attached the second wind climate to the second sub-group. In the screen dump, Turbine cluster A is modelled by Mast 1 while Turbine cluster B is modelled by Mast 2. 

The WAsP flow model may not cross-predict from one met-mast to another correctly, especially if the terrain is complex and RIX numbers differ. Furthermore, be aware of the risk of mistaking annual wind climate variations for spatial variations if the measurement periods of the two met masts differ. 

Regards,
Morten

 

 

 

  

[Gil]

Dear Morten,

Thanks for your confirmation. it means that the WAsP wake model applies for the entire wind farm with the same values and no chances to separate the wake parameters for turbine groups.

Thanks for screen dump and detailed explanations.

as you pointed out, that was the my concerns "the terrain is complex and elevation difference is higher even though RIX numbers are not high".

Regars,

Gyeongil

 

[Morten]

Correct, all turbines' wake model parameters are uniform, but you can modify wake-decay parameters for individual sectors. 

 

Edited March 5 by Morten