WindPro, 'WTG data to file' (2004-02-12)

[Old Forum Archivist]

Dear Sir:

I have a question in WindPro, in "Park" calculation results, then there's a "WTG data to file". When perform this and get a readable file contain informations about the sited WTGs. There's a column named "equivalent roughness", and I often get "Not calculated" on position of some WTGs. How it comes? And Is it a sign that there are mistakes in roughness definition, and will it influence the AEP results?



Anybody can help me here?



Thanks a lot in advance!



Regards,



Wang Yang

China

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The equivalent roughness is all effects caused by the surrounding put into one value, e.g. terrain, roughness and obstacles. The note 'not calculated' simply means a value below zero! This should change with version 2.4 according to EMD.

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