Analysis on Frequency Response of Floating Wind Turbine Considering the Influence of Aerodynamic Damping
Abstract
This study analyzed the influence of aerodynamic damping on frequency domain response of floating wind turbine. The 5 megawatt (MW) floating wind turbine model built by the National Renewable Energy Laboratory (NREL) of America was selected as an example. The aerodynamic damping matrix of the motion for the rigid body was established according to aerodynamic damping calculation method. Hydrodynamic coefficients were computed based on the three-dimensional potential flow theory, and the stiffness of mooring system was also taken into account as linear spring. Motion equations of the wind turbine with or without consideration of aerodynamic damping were then established and solved in frequency domain, respectively. The influence of aerodynamic damping on the motion of the floating wind turbine was examined in frequency domain through the response amplitude operators (RAOs) by solving the equations, and the response spectrum was derived from RAOs and JONSWAP wave spectrum. The results show that aerodynamic damping can effectively reduce the peak values of the surge and pitch RAOs under operating condition, and decrease the amplitude and zero-order moment of the corresponding response spectrum to a certain degree.
Keywords: offshore wind turbines, frequency domain analysis, aerodynamic damping, response amplitude operators, response spectrum
Full Text:
PDFReferences
BULDER B. VAN HEES M T, HENDERSON A. et al. Study to feasibility of and boundary conditions for floating offshore wind lurbines [R]. Barneveld: Lagerway. 2002: 87- 94.
TANG Yougang. LI Jiawen, CAO Han, et al. Frequency domain analysis of motion of floating platform for offshore wind turbine[J]. Journal of Tianjin University: Science and Technology. 2013. 46(10): 879 -881. (In Chinese)
KUHN M J. Dynamics and design optimisation of offshore wind energy conversion systems[D]. Delft: Delft Wind Energy Institute. Delft University of Technology, 2001: 161 - 179.
SALZMANN D. VAN DER TEMPEL J. Aerodynamic damping in the design of support structures for offshore wind tur-bines [C]// Proceedings of the Copenhagen Offshore Conference. Copenhagen: European Wind Energy Association, 2005: 1-9.
DENG Lu. XIAO Zhiying, HUANG Minxi. et al. Numerical simulation of dynamic response for offshore wind turbines including fluid-structure interaction [J], Journal of Hunan U-niversity: Natural Science. 2015. 42(7). 1 -8. (In Chinese)
KAR1MIRAD M. MOAN T. Effect of aerodynamic and hydrodynamic damping on dynamic response of a spar type floating wind turbine[C]//Proceedings of the European Wind Energy Conference EWEC 2010. Warsaw. Poland; European Wind Energy Association, 2010. 2 -10.
RODD1ER D. CERMELL1C C. AUBAULT A, et al. Wind float; a floating foundation for offshore wind turbines[J]. Journal of Renewable and Sustainable Energy, 2010, 2(3)-033104.
WAY.V1AN E. SCLAVOUNOS P. BUTTERFIELD S, et al. Coupled dynamic modeling of floating wind turbine systems [C]//Proceedings of the Offshore Technology Conference. Houston; OTC Committee, 2006; 2-23.
RAMACHANDRAN G. ROBERTSON A. JONKMAN J. et al. Investigation of response amplitude operators for floating offshore wind turbines [C]//Proceedings of the Twenty - third International Offshore and Polar Engineering Conference. Anchorage: International Society of Offshore and Polar Engineers. 2013: 2~i-empirical model for dynamic stall [J]. Journal of the American Helicopter Society. 1989. 34(3) ; 3- 17.
JONKMANJ. BUTTERFIELDS, MUS1AL W, et al. Definition of a 5MW reference wind turbine for offshore system development[R]. Golden. Colorado: National Renewable Energy Laboratory. 2009: 5- 16.
IEC 1100 - 3 Wind turbines-Part 3; design requirements for offshore wind turbines[S]. Geneva; International Electrotechnical Commission. 2009; 21-32.
Refbacks
- There are currently no refbacks.