基于倾斜角权系数校正的风电机组变桨控制

摘要

风力发电系统的数学模型具有高度非线性、时变、多变量、强耦合的特点,为了稳定发电机的输出功率以及减小桨叶受力,在分析机组特性和变桨距控制要求的基础上,根据空气动力学原理以及叶片受力分析等,提出一种基于权系数分配的独立变桨距控制方法,并在传统的根据桨叶的方位角进行权系数分配的基础上,依据倾斜角的变化进行权系数校正,通过仿真证明,在风速高于额定风速时,三个桨叶可以根据风速的变化独立调整其桨距角,从而保证在发电机的输出功率稳定的前提下,减小桨叶承受的气动载荷。%The mathematical model of wind power generation systems has the feature of highly nonlinear, time-varying, multivariable and strong coupling. In order to stabilize the power and reduce the force of the blades, a control method for individual pitch control based on weight number assignment was brought forward on the basis of analyzing unit characteristics and the requirement of pitch control, analyzing the blades force analysis. The weight number correction was modified according to the change of tilt angle based on traditional azimuth angle weight number assignment method. The experiments prove that when the wind speed is higher than the rated speed, the pitch angle is adjusted individually according to the changes of the wind speed, which reduces he aerodynamic loads on the blades, besides making the output of the wind Dower stable.