Problems encountered when running the 5MW model

[lk73438702]

HI，everyone
When I use openfast 3.5 and ROSCO 2.8, the following problem occurs:


The rotor speed is very high, what may be the reason
Best regards！

[lk73438702]

If I use turbulent wind, this is what happens

[jjonkman]

Dear @lk73438702,

It looks like you are simulating the NREL 5-MW baseline wind turbine in OpenFAST with the baseline controller swapped for ROSCO; is that correct? Are you using the ROSCO input file for the NREL 5-MW baseline wind turbine from here: https://github.com/NREL/ROSCO/tree/main/Examples/Test_Cases/NREL-5MW, or something else?

Regardless, the issue appears to be that you haven't initialized your OpenFAST model properly. To ensure that the controller functions properly for normal operation, you should always initialize the rotor speed and blade-pitch angles in ElastoDyn to their expected (mean) value, conditioned on the mean hub-height wind speed you are simulating. At 12 m/s, this would be RotSpeed = 12.1 rpm and BlPitch = 3.823 deg for the NREL 5-MW baseline wind turbine, with the values at other wind speeds given in Figure 9-1 of its specifications report: https://www.nrel.gov/docs/fy09osti/38060.pdf.

Best regards,