基于泛模型的风电机组恒功率预测控制仿真研究

Simulation Research Based on Free Model Predictive Control of Wind Turbine

为平滑风力发电系统额定风速上输出功率的波动,应用关于风剪切及塔影效应的空气动力学理论对叶片载荷进行深入分析,得出风力机桨叶不平衡摆振载荷是输出功率波动的主要原因。针对叶片的非线性耦合特性、被控对象无法准确建模、不确定因素作用及强外界扰动带来的问题,采用泛模型预测的独立变桨控制策略,解决了输出功率波动问题。以3 MW风电机组为研究对象,进行泛模型预测独立变桨控制策略仿真试验,结果表明,相比传统的统一变桨控制,泛模型预测独立变桨控制不仅可以使风力机输出功率的波动大大减小,还能减弱甚至消除由于不平衡载荷带来的疲劳、振动、动力稳定性差等问题。

In order to smooth the output power fluctuation of wind power system at rated wind speed, the application of winct shear and tower shadow effect aerndynamics theory on blade load is analyzed, the wind turbine blade imbalance shimmy load is the main factor of the fluctuation of output power. Aiming at the nonlinear coupling characteristics, controlled object cannot be aeeurately modeled and uncertainty and strong disturbance problems, individual pitch m^del with prcdietive control strategy is used which has benn prooved good to the problem of the output power fluctuation. Being 3 MW wind lurbine as the re, search object, the free model prediction simu- lation experiment of independent variable pitch control strategy is made, the results of which show that compared with the traditional u- niform pitch eontrnl, free model of predictive individual pitch control not only greatly reduces the wind turbine output power fluctua- lion, and also weakens or eliminates fatigue, vibration, dynamie stability etc. originated from the unbalanced load.