Translating observed wind speeds to turbine locations in bulk

[Heather]

I am new to WAsP/WEng/WCA/WAT - I have tried to do my due diligence but apologies if I have missed something obvious:

Amongst all of the tools in the WAsP bundle, is there a way to enter a time series of observed wind speeds at a particular met mast and extract the equivalent estimated wind speeds at each of the turbine locations? 

I am aware that I can load a time series of wind data into the WAsP climate analyser, extract a generalized climate, and then translate that climate to my turbine locations.  I am also aware that I can enter a single wind speed and direction in WEng in order to obtain the predicted wind speeds at each of my turbine locations for that value.  Essentially I just want to do that but for a large number of wind speeds and directions at once.

Thank you for any guidance that you can provide,

Heather

[Joan]

Hi Heather,

[Joan]

Just now, Joan said:

Hi Heather,

You can indeed use multiple met masts in WAsP by assigning each of the wind turbines to the relevant met masts (.omwc files) in the WAsP project and use the similarity principle, which you will find here: https://backend.orbit.dtu.dk/ws/portalfiles/portal/106096865/THE_SIMILARITY_PRINCIPLE.pdf

However, you cannot interpolate between different wind climates in WAsP.

Best regards,
Joan

 

[Heather]

Thank you for your comments.  To clarify: I am not trying to use multiple met masts in WAsP.  I am trying to compute, for a time series of wind speeds from a single met mast, the predicted time series of equivalent wind speeds at each of my turbine locations.

 

Edited August 8 by Heather

[Heather]

For example, would it be valid to use the wind speedup and deflection script to do this by computing the speed up and deflection for a range of angles and then applying it in excel to my time series of met mast observations?  

[Rogier]

Hi Heather, it is not possible yet to do what you describe but we are planning to develop it some time in the future. You can get part of the model chain by applying the speedups but the geostrophic drag law part is currently always converting to histograms (time-independent). If it is just about automating the process you could look at the pywasp or windkit (https://docs.wasp.dk/pywasp/ https://docs.wasp.dk/windkit/) where there is functions to convert from time series to histograms (https://docs.wasp.dk/windkit/io/wc_autogen/windkit.binned_wind_climate.bwc_from_timeseries.html).

[Heather]

OK, thank you for confirming.

[Morten]

Hi Heather, 

The wind speedup and deflection script in WAsP Engineering provides a simple lookup table, which you can use to correct an observed time series observed at a reference point to the conditions at a turbine site and maybe another height above ground ground level. We made this script a long time ago supporting people who wanted to work with alternatives to the annual-maximum method, which in those days was the only extreme-wind estimation method in WEng. 

In principle, you could correct your time series by the lookup table of the WEng speedup and deflection script and use it for other purposes, but be aware that the WEng flow models focus on extreme wind conditions and does not include stability corrections. The built-in standard model of WAsP (IBZ) and WAsP-CFD are more suited for prediction of energy production. When correcting a time series by these models, you must consider possible differences in upwind flow profiles and apply the geostrophic drag law. As mentioned above by Rogier. 

Edited August 12 by Morten