中文摘要：

风速变化的随机性和风力机叶轮巨大的转动惯量导致风力发电机对风速突然变化的动态响应通常都是时间滞后的,这可能会使叶轮转速和输出功率出现较大波动。基于线性二次高斯（LQG）优化控制理论提出变桨距优化控制方法,与传统的PI变桨距控制相比,可以抑制叶轮转速和功率波动。以2 MW变速变桨风力发电机组为实验对象,采用FAST-MATLAB/Simulink联合软件平台分别对LQG优化变桨距控制和传统PI变桨距控制进行仿真分析,证明LQG优化变桨距控制在抑制叶轮转速和功率波动方面的有效性。

英文摘要：

Dynamic responses of a wind turbine to sudden wind speed changes are usually hysteretic because of the wind＇s stochastic characteristics and large nloment of inertia in the rotor, which may cause large fluctuation of rotor speed and output power. Based on linear quadratic Gaussian （LQG） control theory, an optimum pitch control is proposed, which could inhibit the rotor speed and power fluctuations better than traditional PI control. With a wind turbine of 2 MW as a research object, a simulation analysis of LQG and PI controls is conducted by using FAST-MATLAB/Simulink joint software platform, which shows that the optinmm pitch control based on LQG theory could effectively reduce the fluctuations of speed and power.