摘要
针对大型风电机组的不平衡载荷的突出问题,提出基于前馈-反馈结构的多变量二次高斯函数(LQG)最优独立变桨距控制策略。多变量控制器由LQG最优控制器和基于风速信号估计的前馈扰动补偿控制器组成。针对系统的随机不确定性,设计了多变量LQG最优反馈控制器;而前馈控制器侧重于补偿风速低频分量对风轮力矩的影响。采用扩展卡尔曼滤波器来实现对系统状态及有效风速的俯仰方向和偏航方向分量的无差估计。仿真结果表明,与传统的标量PI独立桨距控制相比,多变量LQG最优独立变桨距控制策略具有更好的减载效果。
For the imbalance load problem of large-scale wind turbine, a muhi-variable Linear Quadratic Gaussian function （LQG） optimal individual pitch control strategy based on feedforward-feedback structure was proposed. The multivariable controller was composed by a LQG optimal controller and a forwardfeed disturbance compensation controller based on wind speed signal estimation. The muhivariable LQG optimal feedback controller was designed for the random uncertainty, while the feedforward compensation controller focuses on reducing the wind wheel torque ripple caused by the low frequency components of wind speed. An extended Kalman filter was designed to ob- tain the no error estimation of the system states, the pitch and yaw direction component of the effective wind speed. The simulation results show that muhivariable LQG optimal individual pitch control strategy has better load shedding effect than the traditional scalar PI individual pitch control.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2012年第11期2010-2015,共6页
Acta Energiae Solaris Sinica
基金
国家"十一五"科技支撑计划(2006BAA01A03)
