The rated wind speed power of 5MW wind turbine is calculated as 4.6MW

[sdu20951]

The power of semi-submersible wind turbine is 4.6MW at rated wind speed（11.4m/s）, no pitch, roll and yaw. Is the power at rated wind speed equal to 5MW?

Other questions in the forum also have related issues such as #1634, attributed to the version update, but other reason was given.

[jjonkman]

Dear @sdu20951,

Are you referring to the OpenFAST model of the NREL 5-MW baseline wind turbine atop the OC4-DeepCwind semisubmersible? It sounds like you have disabled the platform degrees of freedom, at least in roll, pitch, and yaw; is that correct? What other simulation settings have enabled?

Best regards,

[sdu20951]

Dear @sdu20951,

Are you referring to the OpenFAST model of the NREL 5-MW baseline wind turbine atop the OC4-DeepCwind semisubmersible? It sounds like you have disabled the platform degrees of freedom, at least in roll, pitch, and yaw; is that correct? What other simulation settings have enabled?

Best regards,

dear jjonkman
The modified file is as follows，Other files in the example are not modified.

[jjonkman]

Dear @sdu20951,

Do you reach rated power if you increase the wind speed a bit higher than 11.4 m/s? If so, I would guess this difference is attributed to changes in the aerodynamics model between the old FAST v7 and newer OpenFAST versions, as discussed in the forum topic (https://forums.nrel.gov/t/nrel-5mw-reference-wt-power-curve/2359) cross-referenced in the issue you cite.

Best regards,