水平轴变转速风力机气动参数辨识

Aerodynamic Parameter Identification of Variable Speed Horizontal Axis Wind Turbine System

文章对变转速水平轴风力机气动参数辨识的问题进行了研究 .风轮的功率曲线为风力机气动性能的整体体现 ,直接影响系统的经济性与控制性能 .通常情况下 ,功率曲线与桨距角和叶尖速比有关 ,可以看成是它们的非线性函数 ,一般由气动性能计算得到 .本文首先利用辨识算法 ,在风轮功率曲线的函数形式假设已知的前提下 ,利用测量的输入输出数据 ,辨识出功率曲线函数的参数 .最后 ,利用辨识出的曲线参数 ,预估系统风轮转速 ,并与测量的转速对比 ,以验证辨识模型的准确性 .

This paper discusses a new calculation method of aerodynamic performance curve of variable speed horizontal axis wind turbine.C p curve presents the whole aerodynamic performance,which can be calculated from the aerodynamic analysis of wind turbine blades.Generally,C p curve can be regarded as a nonlinear function of pitch angle and tip speed.Suppose the curve function structure is known,function parameters can then be identified on the measured system input and output data.In order to confirm the validation of the identification model,predicated rotor speed is compared with the measurement data.