基于滑模控制的大型变速风机的最大风能捕获研究

Maximum Power Point Tracking of Large Scale Variable Speed Wind Turbine Based on Sliding Mode Control

为了解决当风力发电机参数辨识错误或有扰动误差时,最大风能捕获策略出现的风能利用率下降问题,根据已知的风力发电机特性和滑模变结构系统理论,提出了在低于额定风速条件下,变速风力发电机的非线性反馈控制方案。通过使用带有风速估计的滑模控制器,利用转速值进行最大风能捕获。构建系统模型进行仿真并与传统控制策略进行分析比较,结果证实了文中控制策略的正确性和有效性。

To solve the problem that the maximum wind energy capture based wind energy utilization rate decreases due to the error in parameter identification of wind turbine or wind speed fluctuation,According to the known characteristics of wind turbines and variable structure control theory,under the condition of below rated wind speed,put forward a nonlinear feedback control scheme for variable speed wind turbines without wind speed measurements.The best torque method of the maximum wind energy capture are proposed for better performance,using sliding mode controller with wind speed estimation,making use of the rotate speed value for maximum power tracking,and there is no need for wind speed measured or estimated.Finally,the system model was built and simulation results were compared with those of the known method,which showed the correctness and effectiveness of the proposed control strategy.