基于LQG控制的风电机组独立变桨距仿真研究

Simulation of Individual Pitch Control on Wind Turbines Based on LQG Strategiesi

阐述了独立变桨的控制原理,通过对大型风电机组数学模型的简化分析,建立了带卡尔曼滤波器的多变量LQG控制器模型,并使用Blade软件对统一变桨距、PI控制独立变桨距及LQG控制独立变桨距的风力发电机组各关键部位载荷进行了仿真分析。结果表明,相对于统一变桨控制,独立变桨控制可以显著降低风力机各部分载荷,而采用LQG控制策略可以更加有效的降低变桨主轴、叶根、偏航轴承等部件的疲劳载荷,较适合用于大型风力发电机组的独立变桨距控制。

In this paper, the p r in c ip le o f the in d iv id u a l p itc h control is d e s c r ib ed, the m ultivar ia ble linear quadratic Gaussian （ LQG ） fu n c t io n control model w ith coleman f i l te r is established, and the simulation analysis for the loads o f key units in the w ind turbine is conducted by col lec t ive p itc h c o n t ro l, PI individual pitch control and LQG in d iv id u a l p itc h control in the blade p la t fo rm . The experimental test results show that the individual p itc h control can be used to ef fect ively reduce the u n it loads o f the wind turbine comparing wi th the col lec t ive p itc h c o n t ro l, and the LQG control can be used to effect ively reduce the fatigue loads of shaft bear ing, blade root and yaw b e a r in g, e tc. , so i t is more suitable fo r the individual pitch control of large scale w ind tu rb in e .