采用扰动观测器的风力发电系统最大功率控制

Maximum Power Control of Wind Power Generation System Based on Disturbance Observer

针对额定风速以下直驱式永磁同步风力发电系统的最大功率跟踪控制方法,提出一种改进扰动观测器控制DOBC策略。该方法针对风力发电系统负载的实时转矩和速度估计误差引起的扰动,设计了一种基于速度估计的负载转矩扰动观测器LDOB,并将其应用于阵风、渐变风、随机风3种风速系统的扰动观测器的控制,用于实现对系统转矩的估计补偿,以提高负载转矩突变情况下扰动观测器观测精度。最后基于Matlab-Simulink对所设计的复合控制器进行了仿真分析,结果验证了所设计的复合控制器的有效性。

In this paper,the maximum power tracking control method for a direct drive permanent magnet synchronous wind power generation system operating below the rated wind speed is studied,and an improved disturbance observer control(DOBC)strategy is proposed.In consideration of the disturbance caused by real-time torque and speed estima?tion error of the wind power generation system load,a load-torque disturbance observer(LDOB)is designed based on speed estimation,and it is further applied to the control of disturbance observer at three wind speeds,including gust,gradient wind,and random wind.In this way,the estimation of system torque is compensated to improve the observa?tion accuracy of the disturbance observer under load torque mutation.Finally,the composite controller is simulated and analyzed using Matlab-Simulink,and results verify the effectiveness of the proposed composite controller.