风电机组变桨距控制方法的建模与仿真研究

Probe into Modeling and Simulation of Variable Pitch Control Method for Wind Turbines

由于风电机组具有多变量、非线性等特点,传统的PID控制器在风力发电的变桨距控制中存在一定的缺陷,对采用模糊控制和PID控制相结合的模糊PID变桨距控制进行了研究,设计了变桨距参数自调整模糊PID控制器,通过仿真表明这种控制策略控制效果明显优于PID控制,具有良好的静、动态特性和一定的自适应性。此外针对风电机组的时滞特性,采用将模糊前馈与模糊PID结合的新型变桨距控制方法,模糊前馈控制器能够根据风电机组的桨叶气动特性,在额定风速以上的不同风速段时,根据风速给出不同的适当的前馈桨距角,能够有效地减小系统的超调量,缩短调节时间。

Because of strong nonlinear,multivariable and other characteristics of wind turbines,conventional PID controller is difficult to achieve good performance in the variable pitch control of wind power generation.The paper gives a design of parameter selfadjusting fuzzy PID controller with variable pitch,and makes a simulation on the system by Matlab.The results show that this control strategy has a good static＆dynamic characteristics and a certain degree of adaptability comparing with PID control.Aiming at the time delay properties of the wind turbines,the paper proposes a new variable pitch control strategy combining fuzzy feed forward and fuzzy PID control.Based on the analysis of the aerodynamic characteristics of the blade,the fuzzy feed forward controller can give different feed forward pitch angles according to wind speed at different wind speed range above rate wind speed,and effectively reduce the system＇s overshoot and setting time.