半潜型浮式风机运动特征及系泊系统的研究

Research on Motion Characteristics and Mooring System of Semi-submersible Floating Offshore Wind Turbines

近年来海上浮式风机的研究备受关注,安全可靠的系泊系统将保证风机在风、浪、流等复杂环境荷载作用下稳定运行,准确合理地描述风机运动将为评估风机发电效率提供支持。以半潜型浮式风机的系泊系统为研究对象,基于经典悬链线理论,采用准静态分析法提出一套系泊系统的设计方法。通过坐标变换,得到风轮真实的俯仰运动,用于计算风机的动力效应及评定其发电效率。采用动力法分析了系泊系统锚链的导缆孔位置、预张力大小、锚链间夹角等参数对风机系统发电效率、浮式平台运动性能和系泊锚链张力的影响,得到了浮式平台迎风面俯仰角、水平偏移及锚链张力随参数的变化规律,为半潜型浮式风机系泊系统的设计提供了参考。

Recently, floating offshore wind turbines have drawn wide attention. A safe and reliable mooring system can secure the dynamic stability of floating offshore wind turbines against the wind, wave and current load and describing the motion characteristics of wind turbines well and truly can support the evaluation of the wind turbine power-generating efficiency. A semi-submersible floating offshore wind turbine was selected as the object, and a reasonable preliminary design method for mooring system was put forward by using the quasi-static analysis method according to the catenary theory. In order to calculate the dynamic response and the power-generating efficiency of wind turbine, the real pitch of the rotor can be obtained the transformation of coordinates. The effects of mooring line parameters （fairlead location, pretension and angle between lines） on the power-generating efficiency of wind turbine, dynamic response of the system and effective tension of mooring chains were analyzed by using the dynamic analysis method. The variations of pitch movement, offset and effective tension with corresponding parameters were gained based on the results of parametric analysis, providing valuable reference for design of mooring system.