摘要
针对风电机组的强非线性和时滞特性,提出将非线性前馈与模糊PID结合的新型变桨距控制方法,以克服传统PID变桨距调节系统在额定风速以上难以达到满意效果的缺点.根据桨叶的气动特性,采用数值计算和多项式曲线拟合的方法得到桨距角与风速的非线性模型,并以该模型为基础设计了非线性前馈控制器.对某300 kW变桨距风电机组的仿真表明:新方法在额定风速以上的不同风速段都能够有效地减小系统的超调量,缩短调节时间,具有较满意的控制效果.
Aiming at the strong non-linear and time-delay characteristics of wind turbine-generator set,a new variable pitch control strategy combining nonlinear feed forward and fuzzy PID control is being proposed,so as to overcome the deficiency of conventional PID controller that can＇t achieve satisfactory performance above rated speed.According to aerodynamic characteristics of its blade,the nonlinear relationship between pitch angle and wind speed was obtained by way of numerical calculation and least square polynomial fitting method,based on which a nonlinear feed forward controller was designed.Simulation results on a 300 kW variable pitch wind turbine-generator set show that with the new pitch control strategy,the system＇s overshoot can be effectively reduced at different wind speed ranges above the rated speed,while the regulation time shortened and satisfactory control effect achieved.
出处
《动力工程学报》
CAS
CSCD
北大核心
2010年第11期838-843,共6页
Journal of Chinese Society of Power Engineering
基金
中央高校基本科研业务费专项资金资助项目(09MG18)
关键词
风电机组
变桨距控制系统
模糊PID
非线性前馈控制器
气动特性
桨距角
wind turbine-generator set
variable pitch control system
fuzzy PID
nonlinear feed forward controller
aerodynamic characteristic
pitch angle
