极限海况下Spar平台漂浮式风电场平台动态响应研究

Dynamic Response of Floating Wind Farm Platform of Spar-type Offshore Platform under Extreme Sea Conditions

平台稳定性是漂浮式风力机安全运行的基础。以漂浮式风力机Spar平台为研究对象,借鉴“铁索连舟”增强船舶稳定性的思想,建立了共用系泊系统基于Spar平台漂浮式风电场。运用水动力学软件AQWA,采用辐射/衍射理论并结合有限元方法,研究了极限海况下风、浪及流载荷联合作用下多平台的动态响应特性。结果表明:频域分析中,Spar平台在纵荡方向上的幅值响应算子随频率增加逐渐减小,最后趋向于零;在垂荡和纵摇方向上,幅值响应算子随频率增加先增加后减小,最后趋向于零,且峰值频率在低频区域。时域分析中,较之于单平台,漂浮式风电场平台在纵荡、横荡方向上的位移均得到了一定程度的减小,横摇及艏摇运动响应亦得到了抑制。增大系泊链接点半径的方法对于抑制漂浮式风电场平台艏摇响应效果明显。

The stability of the platform is the basis for the safe operation of floating wind turbines.In this paper,the Spar platform of floating wind turbine is taken as the research object,and the idea of“iron rope connection”to enhance the stability of the ship is used.The floating wind farm based on Spar platform is established,and the numerical simulation hydrodynamic software AQWA combined with the finite element is used to analyze the dynamic response characteristics of multi-platform under the combined action of wind,wave and current loads.The results show that in the frequency domain,the RAO of the Spar platform decreases with the increase of frequency,and tends to zero finally.In the direction of heave and pitch,the RAO increases and then decreases with the increase of frequency,and finally tends to zero,and the peak frequency is in the low frequency region.In the time domain,compared with the single platform,the surge and sway of floating wind farm platform have been reduced to some extent,and the response of roll and yaw motion is also suppressed.The method of increasing the radius of the mooring link point has evident effect on suppressing the response of the floating wind farm platform.