大型海上换流站运输及浮托安装数值分析和风险研究

Numerical Analysis and Risk Study of Large Offshore Converter Station Transportation and Floatover Installation

随着海上风电场呈大型化和远洋化的发展趋势,大型海上换流站的需求将不断增加,其安装问题逐渐受到关注。本文以三峡如东海上换流站为例,通过Orca Flex软件建立多体动力学模型,对换流站的运输和浮托安装过程进行了数值计算,分析了部分阶段驳船和换流站的运动、加速度及系泊缆受力等情况。结果表明,在运输阶段,有义波高相同时,随着谱峰周期Tp(6~9s)的增加,驳船换流站系统运动幅值和加速度相应增加,但基本在限定值以内;在浮托安装阶段,相同波高下谱峰周期Tp=8s较Tp=6s和10s会造成更大的纵荡、横荡和艏摇运动幅值,应更加注意此类工况。另外,迎浪条件更有利于浮托作业。对换流站运输阶段进行了风险研究,并提出有效的风险控制措施,为实际大型海上换流站的安装作业提供一定参考。

With the development trend of large-scale and ocean-going offshore wind farms,the demand for large-scale offshore converter stations will continue to increase,and their installation problems will gradually receive attention.In this paper,taking the SanXia Rudong offshore converter station as an example,a multi-body dynamic model is established by OrcaFlex software to numerically calculate the transportation and floatover installation process of the converter station,and the motion,acceleration and mooring line force of the barge and converter station in some stages are analyzed.The results show that during the transportation stage,when the significant wave height is the same,the motion amplitude and acceleration of the barge-converter station system increase correspondingly with the increase of the spectral peak period Tp(6~9s),but they are basically within the limit value.During the installation stage,the spectral peak period Tp=8s at the same wave height will cause greater surge,sway,and yaw motion amplitudes than Tp=6s and 10s,and more attention should be paid to such working conditions.In addition,head sea conditions are more conducive to the floatover operation.Besides,the risk research of the converter station transportation stage is carried out,and effective risk control measures are proposed to provide a certain reference for the actual large-scale offshore converter station installation operation.