风电机组偏航状态载荷控制
Load Control Under Yawed Condition for Wind Turbine

随着低风速风场的不断开发，低风速型风电机组面临叶轮尺寸不断增加和风况更加多变的情况。叶轮尺寸的不断增大带来了叶片柔性的增加，需要更加准确的仿真模型。而风况的多变导致机组长期处于偏航状态，进而导致叶片载荷波动的加剧，对机组寿命产生较大的影响。基于非线性耦合模型，提出了一种独立变桨载荷控制方法。非线性耦合模型采用了几何精确梁和自由涡尾迹方法，更适用于大尺寸叶轮的流固耦合效应的仿真。结果显示，提出的独立变桨控制方法不需要复杂的控制系统和额外的传感系统，即可以获得较好的降载效果。
With the development of low wind speed wind farm, the low wind speed horizontal-axis wind turbine(HAWT) is faced to the increasing large rotor and changeable wind condition. To improve the cost effectiveness of energy, weight-reduction techniques are widely used for large scaled blade. This results in lighter and more flexible rotor blades. It makes sense to develop a more accurate fluid solid interaction (FSI) model. The changeable wind condition leads to longer operation under yawed condition. In this study, a load control strategy is introduced by applying a nonlinear FSI model. The nonlinear FSI model has been developed by coupling a geometrically exact beam (GEB) with a free-vortex wake (FVW) model. The results demonstrate that this load control strategy can decrease the load fluctuation efficiently without a complex control system and additional sensors