I’m confused about the IEC class of NREL 5MW wind turbine.
The technical report “Definition of a 5-MW Reference Wind Turbine for Offshore System Development” (Jonkman et al. 2009) does not specify the class of the wind turbine; the report “Dynamics Modeling and Loads Analysis of an Offshore Floating Wind Turbine” (Jonkman, 2007) specifies that this wind turbine is class IB (Page 95, Table 5-2). However, I noticed that some of the discussions in this forum are based on the assumption that the turbine is classified as IA.
So, can I trust the results of simulations with this wind turbine in which the environmental conditions are more severe than class IB, such as V_ave=10m/s, I_ref=0.16 (IEC class IA) and V_ref=57 (IEC class T) if OpenFAST doesn’t show any warning message?
Thanks in advance and best regards,