Research On Mooring System Of Offshore Floating Wind Turbine Platform

With the rapid development of land-based wind turbines,many problems such as limited land resources,noise,visual pollution,and policy restrictions are gradually exposed.To solve this problem,the location of wind farms is gradually developing from land to sea,and the fixed form gradually From the fixed to the floating direction,with the deepening of the water depth,the production cost of the fixed offshore wind turbine will increase,it is necessary to adopt a more economical and feasible anchor chain for positioning;and the mooring system is important as a traction positioning floating wind turbines.As a component,reasonable mooring arrangement is related to the stability and safety of floating wind turbines,and will affect the power generation efficiency of wind turbines.In the past,domestic and foreign scholars have improved the performance of wind turbines by optimizing the structure of offshore floating platforms.However,there are still few studies on mooring systems that account for 20% of the total input cost of floating wind turbines in the sea.There are still many problems to be solved,so it is of great significance to design a safe and reliable mooring system.(1)Briefly introduce the development history and current situation of offshore wind turbines,refer to the domestic and international research status of floating offshore wind turbine mooring system,compare the performance and economy of offshore floating foundation,according to the ocean to be developed by Ming Yang Smart Energy The structure of the OC4 semi-submersible wind turbines used in the floating wind turbines is the research object.(2)Various environmental loads in the Marine environment are introduced respectively,and related calculations are carried out by using three-dimensional potential flow theory,Morrison theory,aerodynamic theory,etc.and modeling is carried out by using FAST software according to OC4 Deep wind turbines platform parameters.Subsequent studies are carried out according to this platform;By comparing the simulation results of the model with Bladed for wind turbine,the reliability of FASTsimulation results is verified.(3)In order to reduce the chain in the complex ocean environment mooring chock in tension as well as the motion response of the floating platform for the purpose,with a FAST simulation software respectively from different chain number,mooring arrangement and chock position parameters,analyzes the different parameters on the motion response of the floating platform appeal and influence of mooring tension,will platform of simulation to calculate the displacement and tension compared with design specifications,test mooring design meet the design requirements;In addition,the floating wind turbines of the mooring design scheme can still work normally under the condition of maximum anchor chain damage under operating conditions,and the strength of the adjacent anchor chain is checked to further study the situation of a group of anchor chains after failure.Finally,a more economical and safe mooring design scheme is designed to provide some reference for the future design and practical installation of floating offshore wind turbines.(4)The offshore wind turbines is in a complex environment,and the anchor chain is prone to fatigue damage.In order to ensure the normal operation of the offshore floating wind turbines during the service period,the fatigue damage analysis of the anchor chain is also essential.The fatigue damage was analyzed from turbulent wind intensity,different direction of wind wave and wave period.