大型海上升压站浮托法安装施工窗口期

Operation Window for Large-Capacity Offshore Substation Installation with Floatover Method

发展海上风电是实现中国“双碳”目标的重要技术路径。随着海上风电装备的大型化,风电场升压站也需要承载更多、更复杂的设备,这对海上升压站与换流站的安装施工提出了新的挑战。目前,海上风电场升压站及换流站的安装方法主要使用从海洋油气行业借鉴来的浮托法。基于大型海上升压站实际工程的浮托法安装经验,使用时域数值方法对承载大型海上升压站的驳船安装工况进行运动响应模拟。在不破坏导管架基础结构的前提下,研究实际工程中浮托法施工海况是否可以对经验数值进行优化,并用于指导未来实际工程。基于升压站上部组块与驳船,得到的施工窗口期相较于实际工程经验推荐的施工窗口期海况条件更为宽泛。

The development of offshore wind power is an important technology path to accelerate the energy transition.With the large-scale offshore wind power equipment,the substations are designed to carry larger and have more complex electrical layout,leading to new challenges for the installation of offshore substations.At present,the installation method of offshore substation mainly uses the floatover method referred to the marine oil and gas industry.To ensure the safety of installation process,the operation window of sea state plays a key role of guiding the offshore installation.A more relaxed criterion of operation window for substation installation will contribute to a more flexible construction plan of wind farm.Practical criterion of selecting operation window for installing a upper structure of offshore substion in Guangdong area,China is studied.To assess the redundancy of the current criterion,based on the practical experience of large-scale offshore substation installation with floatover method,a time-domain numerical method is carried out to simulate the motion response of the barge carring the upper structure of offshore substation.Avoiding to cause unacceptable strain to the jacket foundation,the load cases are defined as conbinations of several wave headings and various significant wave heights.The results could be used as a reference for the future actual floatover operation.Based on the upper block of the substation and the barge studied,the construction window period obtained is broader than the construction window recommended according to the actual engineering experience.