基于叶素理论的风力发电机组风轮建模

Modeling of Wind Turbine Rotor Based on Blade Element Theory

风力机风轮部分的建模对搭建风力发电整机运行仿真模型有重要意义。在风力机空气动力学特性分析的基础上,讨论了两种风轮建模的基本方法。通过对这两种方法的比较,选用基于叶素理论的方法建立了风轮模型。此风轮模型可适用于各种风力发电机,在已知风力发电机的固有参数的条件下,可以得到设定风速、风轮角速度以及调节桨距角下的风轮输出转矩值。由模型输出得到风力发电机的运行特性曲线,对分析风力发电机运行特性,制定相应的控制策略有着重要的指导作用。对模型施加实际风速信号,实现了对风力发电机组运行状态下输出转矩的模拟,并运用权系数来分隔桨叶的叶素,这不但进一步证明了所建模型的正确性,而且更加合理和精确地建立桨叶的气动模型。

The modeling of wind turbine rotor is useful to simulate the running process of the wind turbine. Based on research of wind turbine aerodynamic characteristics, two modeling methods of wind blade are analyzed. These methods are compared, and the method based on blade element theory is selected in modeling of wind turbine rotor. The model can be used by all kinds of wind turbine, and the torque of wind turbine is obtained when the character data of wind by setting the wind velocity, rotation speed and the blade angle, which is a useful guidance for analyzing the characteristics of wind turbine and making the corresponding control method. The torque under running condition is outputted by applying the signal of wind velocity to the modeling. The blade elements are divided using weight numbers. The result proves the correctness of the model.