漂浮式海上双转子风力机动态响应研究

Dynamic Response of Offshore Floating Dual-rotor Wind Turbine

为研究漂浮式海上双转子风力机的动态响应特性,采用OC3-Hywind Spar漂浮式平台,搭建了漂浮式海上双转子风力机仿真系统。采用自由涡尾迹法(Free Vortex Wake, FVW)和OpenFAST水动力计算模块,建立了漂浮式海上双转子风力机的气动-水动耦合分析模型,并进行了风浪耦合分析与控制仿真。结果表明:主副转子功率波动幅值随风浪夹角变大而逐渐减小;主副转子间流场比陆上双转子风力机更加复杂,多目标变桨控制既可减小功率波动又可缓解副转子的疲劳损伤;风浪夹角在0°和90°的工况下,平台运动响应波动较为明显。

To investigate the dynamic response characteristics of an offshore floating dual-rotor wind turbine,its simulation system was constructed based on the OC3-Hywind Spar floating platform.Its aerodynamic-hydrodynamic coupling analysis model was established using free vortex wake(FVW)method and OpenFAST hydrodynamic computation module.The wind-wave coupling analysis and control simulation were conducted.Results show that its power fluctuation amplitude generated by the primary and auxiliary rotors decreases as the wind and wave angle increases.Its flow field between the primary and auxiliary rotors is more complex compared to onshore dual-rotor wind turbine.Multi-objective variable-pitch control can reduce the power fluctuation and alleviate the fatigue damage to auxiliary rotor.The platform motion response fluctuates more significantly within the wind and wave angle range of 0°to 90°.