To support concept studies aimed at assessing offshore wind technology, we developed the specifications of a representative utility-scale multimegawatt turbine now known as the "NREL offshore 5-MW baseline wind turbine." This wind turbine is a conventional three-bladed upwind variable-speed variable blade-pitch-to-feather-controlled turbine. To create the model, we obtained some broad design information from the published documents of turbine manufacturers, with a heavy emphasis on the REpower 5M machine. Because detailed data was unavailable, however, we also used the publicly available properties from the conceptual models in the WindPACT, RECOFF, and DOWEC projects. We then created a composite from these data, extracting the best available and most representative specifications. This report documents the specifications of the NREL offshore 5-MW baseline wind turbine-including the aerodynamic, structural, and control-system properties-and the rationale behind its development. The model has been, and will likely continue to be, used as a reference by research teams throughout the world to standardize baseline offshore wind turbine specifications and to quantify the benefits of advanced land-and sea-based wind energy technologies. vii

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Revision Date Description 1.00 09-Jul-2002 First publication. Supports FAST v4.0. 1.10 04-Sep-2002 Inserted an additional output channel (TipSpdRat or TSR) and additional prefixes ("-", "_", "m", or "M") for reversing the sign of the selected output channels. Still supports FAST v4.0. 1.20 28-Feb-2003 Clarified the descriptions of several input variables. 1.21 31-Mar-2003 Replaced drivetrain references from "rotational" to "torsional." 1.22 03-Apr-2003 Fixed the labels on the drawings of the coordinate systems. 1.30 08-Sep-2003 Added description of the FAST-to-ADAMS preprocessor and associated inputs. Added placeholders for the inputs of the currently undocumented FAST linearization and noise prediction routines. Clarified the descriptions of several input variables. Renamed input switch TeetDMod to TeetMod and altered its functionality so that routine UserTeet() can implement user-defined teeter spring and damper models. Added supplementary output names for the blade root in-plane, out-of-plane, flap, and edge bending moments. 1.31 03-Oct-2003 Added description of the FAST linearization analysis capability. Clarified the descriptions of several input variables. 1.32 07-Oct-2003 Updated the example summary, AeroDyn, and linearization output files. Had the Linearization chapter type edited by NREL communications. 1.40 28-Oct-2003 Changed the extension of the input file names from .fad or .inp to ".fst" Added Alpha, PrecrvRef, and PreswpRef to the FAST-to-ADAMS preprocessor. Supports FAST v4.4. 1.41 07-Nov-2003 Inserted additional output channels for the blade and tower torsional deflections. Moved the origin of the nacelle/yaw coordinate system to the tower-top. 1.42 11-Dec-2003 Documented that the dummy supplied UserGen() routine now calls the sample UserVSCont() routine. 2.00 05-Mar-2004 Added description of new FAST furling capability and associated I/O. Added additional output channels for blade tip-to-tower clearances. Clarified the descriptions of several input variables. Supports FAST v5.0. 2.10 01-Oct-2004 Added a chapter on how to compile FAST. Documented upgrades relating to turbine control, including yaw and high-speed shaft brake control. Added a description on the interface between FAST and Simulink and on the interface between FAST and Bladed-style DLL master controllers. Clarified the descriptions of several input variables. Added supplementary output names for the angular speed and acceleration of the high-speed shaft and generator. Supports FAST v5.1. 3.00 09-Jun-2005 Added description of new platform motion and loading functionality. Documented upgrades relating to turbine control and output capabilities. Added additional output channels and names for the angular (rotational) deflections of the tower-top and blade tips. Clarified the descriptions of several input and output parameters. Supports FAST v6.0. 3.01 12-Aug-2005 Incorporated editorial changes from NREL communications. Added reference to the certification report from Germanischer Lloyd WindEnergie. Added a Sample Input Files section in t...

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