风浪流中半潜式风机系统动力响应特性研究

Dynamic response analysis of a semi-submersible wind turbine system in wind,wave & current environments

以三浮筒(Tri-floater)型半潜式风机系统为对象,采用时域方法,考虑垂荡板的黏性阻尼效应,研究系泊缆直径、长度、预张力和布置方式等参数对其在风浪流中动力响应特性的影响规律,提出了一种系泊参数优化方法。在此基础上,根据东海和南海三个不同水深区域百年一遇海洋环境条件,通过调整Tri-floater型浮式基础的吃水和垂荡板等参数,有效地提高了其运动响应周期,减小了其运动响应幅值。同时,根据风机浮式基础运动幅值的设计规范要求,针对三个不同水深区域特点,设计了Tri-floater型浮式基础的系泊系统。计算结果表明,改进后的Tri-floater型半潜式风机系统能满足百年一遇极端环境下的作业要求,适合于东海和南海海洋环境下海上风能资源的开发。

By taking the effects of viscous damping into account,a time domain analysis is proposed for analyzing the effect of the mooring system parameters on the dynamic responses of the Tri-floater semi-submersible offshore wind turbine in wind,wave and current,and then an optimization scheme is presented for the mooring line diameter,length,pre-tension and arrangement.Meanwhile,based on once-in-a-century met ocean data in the East and South China Seas,a modification scheme is presented for the draft and heave plate diameter of the original Tri-floater wind turbine so that the motion periods are significantly increased,and the response performances are effectively improved for such a modified Tri-floater wind turbine.Moreover,based on the design standard for the floating wind turbine system,a design scheme is presented for the mooring system of such a modified Tri-floater wind turbine according to three different water depth conditions in the East and South China Seas.Results show that the modified Tri-floater wind turbine can meet the operation demand under once-in-a-century extreme conditions,and hence suitable for the exploitation of offshore wind resources in the East and South China Seas.