15MW级大型漂浮式风力机运动特性

Motion Characteristics of 15 MW Large Floating Wind Turbine

为了研究不同湍流模型、湍流度及不同风速作用下漂浮式风力机(FOWT)基础的运动特性,以国际能源署(IEA)公开的15MW级大型半潜式浮式风机为研究对象,采用OPENFAST软件对浮式风机进行全耦合时域仿真模拟,对平台的纵荡、纵摇和垂荡运动特性进行研究分析。研究发现:在正常湍流作用下,风速高于额定条件时,平台在压载水主动调节作用下使得纵荡更加稳定,但伴随着风速增大,其对平台纵摇和艏摇的影响越剧烈;在极端湍流作用下,风速低于额定条件时,风机运行效率低,而在高于额定条件时,艏摇运动幅值增大,纵摇和垂荡运动表现得更加稳定。

In order to study the motion characteristics of floating offshore wind turbine(FOWT)platform under different turbulence models,turbulence intensity and different wind speeds,taking the 15 MW semi-submersible FOWT published by the International Energy Agency(IEA)as the research object,the OPENFAST software is used to conduct a fully coupled time-domain simulation of the FOWT,and the platform’s surge,pitch and heave motion characteristics are analyzed.The study found that under the normal turbulence,when the wind speed is higher than the rated condition,the platform surge becomes more stable under the active regulation of ballast water.However,the impact on pitch and yaw becomes more severe with the increase of wind speed.Under the extreme turbulence,the wind turbine operation efficiency is low when the wind speed is lower than the rated condition,but when the wind speed is higher than the rated condition,the amplitude of yaw motion increases,and the pitch and heave motion are more stable.