The dynamic response of a two-rotor wind turbine mounted on a spar-type floating platform is studied. The response is compared against the baseline OC3 single-rotor design. Structural design shows how the two-rotor design may lead to a mass saving of about 26% with respect to an equivalent single-rotor configuration. Simulations predict significant platform yaw response of the two-rotor floating wind turbine — about 6 deg standard deviation at the rated operating wind speed. It is shown how the platform yaw response is directly caused by the turbulence intensity at the hub coupled with the transversal distribution of thrust loads on the structure. A coupled control strategy for the rotor-collective blade pitch controller is proposed, in which a simple proportional control mitigating platform yaw motion is superimposed to the baseline OC3 PI controller. Numerical simulations show how platform yaw response is reduced by about 60%, at the cost of mean power loss at below-rated wind speeds of about 100 kW and maximum increase of the rotor-collective blade-pitch angles standard deviation of about 2 deg. Parametric analysis of mooring lines design shows how an equivalent mass density of the line of at least 190 kg/m is needed to avoid vertical loads at the anchors.

研究了安装在翼梁式浮动平台上的双转子风力发电机的动态响应。将响应与基线 OC3 单转子设计进行比较。结构设计表明，与等效的单转子配置相比，双转子设计如何可以节省约 26% 的质量。模拟预测了两转子浮动风力涡轮机的显着平台偏航响应——在额定工作风速下约为 6 度的标准偏差。显示了平台偏航响应是如何直接由轮毂处的湍流强度加上结构上推力载荷的横向分布引起的。提出了一种转子-集体叶片桨距控制器的耦合控制策略，其中一个简单的比例控制减轻平台偏航运动被叠加到基线 OC3 PI 控制器。数值模拟显示平台偏航响应如何降低约 60%，代价是低于额定风速时的平均功率损失约为 100 kW，转子-集体叶片桨距角标准偏差的最大增加约为 2 度。系泊缆绳设计的参数分析显示了如何需要至少 190 kg/m 的缆绳等效质量密度来避免锚处的垂直载荷。