Dynamic response and stability improvement of Spar platform of floating wind farm with array platform

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (3) : 263-278.

YUE Minnan1, WANG Bo1, LI Chun1,2, LI Shujun1

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Abstract

The stability of platform is the basic guarantee for safe operation of floating wind turbine. Here，to study the dynamic response of Spar platform of floating wind farm with array platform under wind-wave coupled action, a NREL 5 MW floating wind turbine model based on OC3-Hywind Spar buoy platform was established. The floating wind farm with 3×3 array Spar platform was established by link mooring and fixed mooring. Based on the blade element momentum theory, considering blade tip loss, hub loss and dynamic stall, the Hydrodynamic software AQWA was secondarily developed with FORTRAN programming. The aerodynamic-hydraulic-link mooring-fixed mooring coupled dynamic model of the floating wind farm platform was established and solved using the model calculation method. Combined with the radiation / diffraction theory, the dynamic response characteristics of the floating wind farm Spar platform under wind-wave coupled action was studied. In order to solve the problem of large amplitude yaw and roll responses of the platform when the mooring system is directly linked with the main body of Spar platform, two methods to improve the stability of the platform were proposed, i.e., the yaw damping plate and the outer moving of the mooring link point. The influence of the two methods on the dynamic response characteristics of the floating wind farm platform was studied. The results showed that it is not feasible for mooring system to link Spar platform directly to establish array platform floating wind farm, the platform can produce great roll and roll responses; in normal sea state, yaw damping plate obviously reduces yaw and roll responses of the floating wind farm platform, and the effect is not obvious under extreme sea conditions; outer moving of the mooring link point under both two conditions of normal sea state and extreme sea state can obviously reduce yaw and roll responses of the floating wind farm platform; when the mooring link point moves outward, the motion trajectory in xOy plane, yaw and roll responses of the platform located on both sides are symmetric relative to the incident direction of wind-wave; the platform P1, P4 and P7 located at the middle do not have sway, roll and yaw responses, while platforms located on both sides have sway, roll and yaw responses; when the mooring link point is moved outward, the stability of surge, pitch and nacelle vibration of almost all platforms in the wind farm is improved to a certain extent; the study results provide a theoretical reference for improving stability of floating wind turbine platforms.

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floating wind turbine / platform / array / blade element momentum (BEM) / radiation/diffraction theory / dynamic response

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YUE Minnan1, WANG Bo1, LI Chun1,2, LI Shujun1. Dynamic response and stability improvement of Spar platform of floating wind farm with array platform[J]. Journal of Vibration and Shock, 2021, 40(3): 263-278

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