系泊参数对漂浮式风力机稳定性的影响规律研究

Study on the Effects of Mooring Parameters on the Stability of Floating Wind Turbine

海上漂浮式风力机在随机风载荷和随机波浪载荷的共同作用下运行,其自身结构及系泊系统的合理设计对实现其稳定性起决定性作用。该文以Spar结构漂浮式风力机为研究对象,利用牛顿-欧拉方程建立了系统动力学方程,得到了对漂浮式风力机两个最重要的运动形式(纵荡和纵摇)的动力学响应;利用快速傅里叶变换得到了漂浮式风力机纵荡和纵摇固有频率。基于此模型,并以NREL 5MW Spar结构漂浮式风力机为算例,分析了系泊系统缆绳3个参数:系泊半径、导缆孔位置和缆绳长度对系统稳定性的影响,得到了系统纵荡、纵摇和缆绳张力随3个参数的变化规律,为漂浮式风力机系泊系统设计提供了参考。

The floating wind turbine works under the condition of random wind and wave loads, its structure and rational design of mooring system play a critical role in the system stability. A Spar-type floating platform was selected as the research object; the pitch and surge responses, which are the most important motions, were obtained by using Newton-Euler equation. The natural frequency of surge and pitch were obtained by using fast Fourier transform （FFT）. Based on this model, taking NREL 5MW Spar type floating wind turbine as an example, the effects of mooring line parameters （mooring radius, fairlead location and mooring line length） on the stability of floating wind turbine were analyzed. The relationships among surge, pitch and mooring line tension changing with the three parameters were obtained. The conclusions are valuable reference for mooring system design.