Abstract:

Flutter as an important problem of blade failure has always been the focus of wind power research. To restrain blade flutter in the process of blade work, the actual wind speed distribution, especially the influence of wind shear and tower shadow on blade vibration, should be fully considered for establishing analysis model, and discretized to obtain the average input wind speed. This study is to consider stall flutter with high frequency and amplitude under conditions of nonlinear aerodynamic action, large wind speed and big angle of attack for comprehensive analysis of aeroelastic stability of small-scale wind turbine blades of the real structure, and simulate the typical section vibration. The vibration frequencies and amplitudes of two displacements of both flap-wise and lead-lag motions are controlled by rolling optimization and error correction of model predictive control. The results show that the controlled vibrations can be stable in a short time, with the static error being accepted.

摘要：

作为叶片失效的重要原因，颤振一直是风电领域研究重点。以抑制叶片工作过程中的颤振为目的，建立分析模型时应充分考虑实际风速分布特别是风切变和塔影效应对叶片振动的影响，并在离散化后求取平均输入风速。针对小型风力机叶片气动弹性稳定性问题进行综合分析，根据实体结构建立叶片气弹模型，考虑非线性气动力作用时叶片大攻角、大风速工况下产生的高频、高幅失速颤振，模拟典型截面仿真振动位移。通过模型预测控制的滚动优化和误差矫正控制叶片挥舞、摆振两个运动方向的振动频率和幅值，结果表明振动形式实现控制后可在短时间内达到稳定且静差可接受。

关键词: 振动与波, 风力发电机, 气动弹性, 颤振抑制, 模型预测控制, 风速分布