自升式风电安装平台半浮态作业安全性评估

Safety Assessment of Semi-Floating Operation of Jack-up Wind Power Installation Platform

为解决目前在规划风场海域作业的自升式海上风电安装平台不能满足现有的海上风机设备安装的问题,提出一种自升式风电安装平台半浮态作业方案。采用Sesam的Wadam模块进行波浪载荷预报,计算得到不同吃水下的波浪载荷。分析风力方向为90°(横风)时,不同吃水下的风电安装平台的风载荷和流载荷。在此基础上,建立整船有限元模型,采用Genie自带的分析模块Wajac进行桩腿支座反力计算,得到不同吃水下平台的抗倾覆力矩和抗倾覆安全因数,分析波浪对船底产生较大冲击力的吃水深度范围。结果表明:当船体吃水在0.5~3.0 m时,半浮状态可提供较大的浮力;当船体吃水在1.5 m左右时,桩底压力变化较为平缓。因此,采用半浮状态进行安装作业可提高作业效率,与大插深、全升船作业相比,减少移船时间,对实际工程具有一定的参考价值。

In order to solve the problem that the jack-up wind power installation platform can not meet the existing installation problem of offshore wind turbine equipment, a semi-floating operation scheme of jack-up wind power installation platform is provided. The Wadam module of Sesam software is used to predict the wave load and the wave load at different drafts is calculated. The wind and flow loads at different drafts are analyzed when the direction of wind is 90°. The finite element model of the whole ship is established and the support reaction of the leg is calculated by the analysis module Wajac provided by Genie. The anti-capsizing moment and safety factor of the platform at different drafts are obtained, and the draft range of the waves which may have greater impact on the bottom of the ship is analyzed. The results show that: the semi-floating state can provide greater buoyancy when the draft is in the range of 0.5-3.0 m;the pressure of the leg bottom changes gently when the draft is about 1.5 m. Therefore, the operation efficiency can be improved and the time of moving ship is reduced by the semi-floating state for installation compared with large insertion depth and full lift operation, which can provide reference for practical engineering.