基于反馈线性化H_∞理论的风电系统桨距角控制  

Pitch Angle Control of Wind Turbine Power System Based on Feedback Linearization H_∞ Theory

作　　者：刘吉宏 柳亦兵[1] 徐大平[1] 

机构地区：[1]华北电力大学控制科学与工程学院,北京102206

出　　处：《系统仿真学报》2010年第6期1416-1420,共5页Journal of System Simulation

基　　金：国家自然科学基金(50677021);教育部重点项目基金(105049)

摘　　要：风电系统工作在额定风速以上时,扰动风速会导致输出功率出现脉动,这会对电网的稳定性产生不利影响。为了解决这个实际问题,将非线性干扰抑制理论应用到桨距角控制律的设计中,建立了整个机组含风速扰动项的非线性数学模型;采用精确线性化方法将问题转化为标准的H∞控制问题,以避免HJI不等式的求解,同时还可以保证系统在工况点大范围变动时仍具有较好的控制性能。利用MATLAB/Simulink进行了对比仿真,结果表明该控制策略对风速扰动具有抑制作用,能够实现功率的平稳输出,适应工况点大范围变动的情形,控制性能要优于基于单个工况点近似线性化模型的控制方法。When the wind turbine power system works above the rated wind speed, the disturbance of wind speed can cause the output power fluctuation, and this can influence the stability of grid. In order to solve this actual problem, the nonlinear disturbance attenuation theory was applied to the design of pitch angle controller, the nonlinear mathematical model with wind speed disturbance item of the whole unit was established and the exact linearization method was adopted to transform the problem into the standard H∞ control problem so that the solving of HJI inequality could be avoided and the better control performance could be guaranteed in the situation of large-scale variety of operation point. The contradistinctive simulation was made by using MATLAB/Simulink, and the result shows that this control strategy has good inhibitory effect to wind turbulence, adapts to the large range variety of operation point, can realize the steady power output, and the control performance is better than that of those control methods which are based on the approximate linearization model around the single operation point.

关 键 词：风力发电系统 非线性H∞理论 HJI不等式 精确线性化 干扰抑制 变工况 桨距角控制 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置] TM614[自动化与计算机技术—控制科学与工程]