Study On Influence Of Water Depth On Dynamic Response Of Multi-floating-body Wind Power Platform

Wind power on land can not meet the human and social economic and social development,many new energy development agencies and scholars aimed at offshore wind energy development.Affected by the depth of water,some forms of offshore wind power platform can not be installed to the sea and deeper waters.Obtaining wind energy from remote sea is an important way for mankind to use renewable energy in the future.To ensure stable operation of wind turbine,it is of great importance to study the effect of water depth on the dynamic response of the structure.This paper studies the effect of water depth on the dynamic response of a multi-floating wind power generation platform.The dimensions and physical attributes of 5MW wind turbine and tower developed by NREL(National Renewable Energy Laboratory)are selected.Reference is made to Fukushima’s future Wind turbines are used to design the structural parameters of the floating foundation.Using Siemens 3D modeling software UG,a model is established to calculate the buoyancy,and the parameters selected in the early stage are optimized.Then,using the SESAM developed by DNV(Det Norske Veritas)GeniE establishes a finite element model,and finally calculates the motion response and the structure response using the Hydro-D and Sestra modules.The content of this paper is as follows:(1)The 5MW wind turbine generator set data and tower data were obtained from NREL website.Based on the related parameters,a preliminary design of the multi-floating floating foundation structure of the wind power platform was made.The UG wind turbine platform was modeled with UG software to analyze the mechanical properties In order to ensure the wind turbines works normally,the size parameters of the structure are optimized.(2)The optimized size parameters are used to model the GeniE module of SESAM software,and then the mesh quality of the finite element model is generated and continuously optimized to output different levels of supercell models needed for Hydro-D calculation and analysis,namely,the wet surface model,the structural model and the mass model(3)Because of the yawing system of generating set,the influence of nose heading at different headings on the motion response and structural response of multi-floating wind power platform structure is researched under the same water depth.(4)Calculate the frequency response of multi-floating wind power generation platform under different water depths.Analyze the response amplitude of each degree of freedom under different water depths and the structural response changes of both ends of the connecting rod;(5)The response results of various working conditions are analyzed.The response amplitude and stress amplitude of different heading angle and the law of response amplitude and stress under different water depth are obtained.The further study on the dynamic response of structures at different water depths is prospected.