减小风剪、塔影和湍流效应的独立变桨控制研究

针对现阶段兆瓦级风力发电机组(简称风力机组)运行在高风速时,由于风剪、塔影、湍流等因素影响,传统的PI统一变桨控制不能很好控制叶轮的不平衡载荷问题,提出了基于叶根载荷反馈的独立变桨控制策略。首先使用Bladed平台计算翼型的气动参数,再将各叶片的叶根载荷通过d-q坐标变换送入PI控制器中计算出各叶片最佳增益;其结果经过d-q坐标逆变换,获得各叶片附加桨距角,在统一变桨的基础上实现对各叶片独立变桨的控制。通过对叶根载荷和叶片挥舞弯矩仿真分析,验证了建立的独立变桨控制策略的优越性。

Study on Independent variable pitch control of reduction of wind shear and tower shadow and turbulence

Aiming at the present stage of megawatt Wind Turbine (Referred to as wind turbine) when running at high speed, due to the wind shear and tower shadow, turbulence and other factors, the traditional PI unified pitch control can not well controll the unbalanced load problem of impeller, the individual pitch control strategy based on the blade root load feedback is proposed in this paper. First, the aerodynamic parameters of airfoils considering wind shear and tower shadow and turbulence is calculated by the Bladed platform. Then, the blade root load of each blade by d-q coordinate transformation is send to the PI controller to calculate the optimal gain, and the calculated result is transformated to the additional pitch through the d-q coordinate inverse transformation. On the basis of the unified variable pitch, the independent variable pitch control of each blade is realized. Through the analysis of blade root load and blade flapping bending moment simulation, the superiority of established the independent variable pitch control strategy is verified.