Coupled dynamic analysis of multiple wind turbines on a large single floater

The present study has developed a numerical simulation tool for the coupled dynamic analysis of multiple turbines on a single floater (or Multiple Unit Floating Offshore Wind Turbine (MUFOWT)) in the time domain including multiple-turbine aero-blade-tower dynamics and control, mooring dynamics, and platform motions. The numerical tool developed in this study was designed based on and extended from the single-turbine analysis tool FAST to be suitable for multiple turbines. For hydrodynamic loadings of floating platform and mooring-line dynamics, the CHARM3D program developed by the authors was incorporated. Thus, the coupled dynamic behavior of a floating base with multiple turbines and mooring lines can be simulated in the time domain. The developed MUFOWT analysis tool can compute any type of floating platform with multiple horizontal-axis wind turbines (HAWT). To investigate the dynamic coupling effect between platform and each turbine, one turbine failure case with a fully broken blade was simulated and checked. The aerodynamic interference between adjacent turbines, including wake effect, was not considered in this study to more clearly demonstrate only the dynamic coupling. The analysis shows that some damage-induced excitations from one turbine in MUFOWT may induce appreciable changes in the performance of other turbines or the floating platform.

[1]  H. Y. Kang,et al.  Hydrodynamic interactions and coupled dynamics between a container ship and multiple mobile harbors , 2012 .

[2]  T. Kane.  Dynamics of Nonholonomic Systems , 1961 .

[3]  Chan K. Yang,et al.  Transient effects of tendon disconnection of a TLP by hull–tendon–riser coupled dynamic analysis , 2010 .

[4]  Jason Jonkman,et al.  Dynamics Modeling and Loads Analysis of an Offshore Floating Wind Turbine , 2007 .

[5]  Moo-Hyun Kim,et al.  Hull/Mooring Coupled Dynamic Analysis of a Truss Spar In Time Domain , 1999 .

[6]  Tomoki Fujii,et al.  Potential for Floating Offshore Wind Energy in Japanese Waters , 2002 .

[7]  Chan K. Yang,et al.  The structural safety assessment of a tie-down system on a tension leg platform during hurricane events , 2011 .

[8]  J. Jonkman.  Influence of Control on the Pitch Damping of a Floating Wind Turbine , 2008 .

[9]  J. Jonkman,et al.  Definition of a 5-MW Reference Wind Turbine for Offshore System Development , 2009 .

[10]  Arcandra Tahar,et al.  Hull/mooring/riser coupled dynamic analysis and sensitivity study of a tanker-based FPSO , 2003 .

[11]  Sandy Butterfield,et al.  Feasibility of Floating Platform Systems for Wind Turbines: Preprint , 2004 .

[12]  K. C Tong,et al.  Technical and economic aspects of a floating offshore wind farm , 1998 .

[13]  J. N. Newman,et al.  THE COMPUTATION OF SECOND-ORDER WAVE LOADS , 1991 .

[14]  Jason Jonkman,et al.  Coupled Dynamic Modeling of Floating Wind Turbine Systems , 2006 .

[15]  Moo-Hyun Kim,et al.  Coupled Dynamic Analysis of FOWT (Floating Offshore Wind Turbine) With Partially Broken Blade , 2013 .

[16]  Jason Jonkman,et al.  FAST User's Guide , 2005 .

[17]  J. M. Jonkman,et al.  Modeling of the UAE Wind Turbine for Refinement of FAST{_}AD , 2003 .

[18]  Moo-Hyun Kim,et al.  Rotor-floater-mooring coupled dynamic analysis of mono-column-TLP-type FOWT (Floating Offshore Wind Turbine) , 2011 .

[19]  G. H. Wijnants,et al.  Floating Windfarms For Shallow Offshore Sites , 2003 .

[20]  Moo-Hyun Kim,et al.  Rotor-floater-tether coupled dynamics including second-order sum–frequency wave loads for a mono-column-TLP-type FOWT (floating offshore wind turbine) , 2013 .

[21]  Moo-Hyun Kim,et al.  Variability of TLP Motion Analysis Against Various Design Methodologies/Parameters , 2001 .

[22]  John P. Borg,et al.  Mass and Aerodynamic Imbalance of a Horizontal Axis Wind Turbine , 1998 .