变桨距风力发电系统的滑模变结构控制

Sliding model control and its application to adjustable-pitch wind power system

讨论了变桨距风力发电系统在高风速时桨距控制问题。针对风力机系统的非线性,参数变化等特性,根据风力机机理,基于一定假设得到风力机在某一工况点线性模型,进而提出滑模变结构控制方案,充分利用变结构控制对被控对象的模型误差、对象参数的变化以及外部干扰有极佳的不敏感性的优点。对系统仿真时再加入系统的不确定性,仿真结果表明所提出控制方案的有效性,系统具有很好鲁棒性。

This paper discussed the control issue of the adjustable-pitch wind energy conversion system above rated speed wind. In view of the non-linearity property, parameter changing characteristic, so on and so forth for wind turbine, based on the mechanism of the wind turbine, this paper obtained the wind turbine＇s linear model under a certain condition point under some assumption, and then proposed sliding model control strategy by taking full use of the SMC＇s non-sensitivity merit towards the model error and the parameter changing as well as exterior disturbance, Some uncertainty of model was added to the system simulated, the simulation result indicates that the proposed control plan is effective, and the system also has good robustness.