基于高阶ESO的永磁直驱风电系统快速终端滑模控制

Fast Terminal Sliding-mode Control of Permanent Magnet Direct-drive Wind Power System Based on High-order ESO

针对永磁直驱风力发电系统非线性强和风速多变问题,提出一种基于高阶扩张状态观测器HOESO(highorder extended state observer)的最大功率跟踪控制方法。首先利用高阶扩张状态观测器精确估计出由风速突变引起的系统转矩和转速变化,然后将其前馈补偿到快速终端滑模控制器中抵消干扰,增强系统的抗扰能力和鲁棒性。仿真结果表明,该方法能够实时估计风速引起的转矩扰动,转速控制精度高,实现最大程度利用风能。

To address the problems of strong nonlinearities and variable wind speeds in permanent magnet direct-drive wind power generation systems,a maximum power point tracking control method is proposed based on high-order extended state observer(HOESO). First,the HOESO is used to accurately estimate the changes in system torque and rotational speed caused by the sudden change in wind speed. Then,feedforward compensation is applied to a fast terminal sliding-mode controller to cancel the disturbance,so as to enhance the disturbance rejection capability and robustness of the system. Simulation results show that the proposed method can estimate the torque disturbance caused by wind speed in real time with a high control accuracy of the rotational speed,thus realizing the maximal use of wind energy.