High oscillations in system "IEA-15-240-RWT-Monopile"

[Heike.vonWaaden]

Dear readers,

I am making my first steps with “OpenFAST-V3.5.0” on a Windows 10 machine.
I downloaded the “IEA-15-240-RWT-Monopile” turbine model from here:

IEA-15-240-RWT

and I use the controller library “libdiscon.dll” which I downloaded from here:

dll-source

Now I have simulated a time series with a constant wind speed of 10 m/s.

So far, so good - but when I look at different signals, the whole turbine behaviour is very strange as you can see in the uploaded picture (there are high oscillations 8-9 Hz in the system) …

I guess it is an controller issue, but since I have used the downloaded model and dll and haven’t changed anything - I would not expect this strange behaviour.

Can someone please give me a clue what is going wrong here?
Thank you very much.

With kind regards,
Heike

[Pietro.Bortolotti]

Hello Heike,
The issue has been fixed in the develop branch of the IEA15 repo with this PR: Simple vs ctrl by ptrbortolotti · Pull Request #158 · IEAWindTask37/IEA-15-240-RWT · GitHub
I hope this helps.
best regards,
Pietro

[Heike.vonWaaden]

Dear Pietro,

thank you for much for your quick response
I checked out the updated model and now it looks much better

Here a screenshot of the updated time series:

Best Regards,
Heike