永磁直驱风电系统MPPT无模型固定时间滑模控制  

Model-free fixed-time sliding mode control for MPPT of permanent magnet direct-drive wind power system

作　　者：高越 冉华军[1] 李林蔚 李敖 王新权 Gao Yue;Ran Huajun;Li Linwei;Li Ao;Wang Xinquan(College of Electrical Engineering and New Energy,China Three Gorges University,Yichang 443002,China)

机构地区：[1]三峡大学电气与新能源学院,宜昌443002

出　　处：《国外电子测量技术》2024年第8期94-102,共9页Foreign Electronic Measurement Technology

摘　　要：针对永磁直驱风力发电系统在最大功率跟踪过程中因内部参数变化和外部扰动导致跟踪性能下降的问题,提出一种无模型固定时间积分滑模控制(model free fixed-time integral sliding mode control,MFFTISMC)方法。首先,构建了永磁同步电机转速环的新型超局部模型。基于该模型,结合固定时间理论设计了无模型固定时间积分滑模控制器,确保系统状态固定时间内收敛,利用Lyapunov函数证明了该控制器的收敛性。同时,为提高系统的抗干扰能力和跟踪性能,设计扩张扰动观测器(extended disturbance observer,EDO)对新型超局部模型中的未知扰动在线估计并以前馈补偿的方式补偿给控制器。最后,通过仿真对比,验证了该方法具有响应速度快、抗扰能力强的特点,能够在风速突变情况下快速实现最大功率跟踪。Aiming at the problem of tracking performance degradation of permanent magnet direct-drive wind turbine system during maximum power tracking due to internal parameter changes and external disturbances,a model free fixed-time integral sliding mode control(MFFTISMC)method is proposed.Firstly,a novel ultra-local model of permanent magnet synchronous motor speed ring is constructed.Based on this model,a model free fixed-time integral sliding mode controller is designed in combination with the fixed-time theory to ensure the convergence of the system state in fixed time,and the convergence of the controller is proved using the Lyapunov function.Meanwhile,in order to improve the anti-interference ability and tracking performance of the system,an extended disturbance observer(EDO)is designed to estimate the uncertain disturbances in the novel ultra-local model online and compensate them to the controller by feed-forward compensation.Finally,through simulation and comparison with other control strategies,it is verified that the method is characterized by fast response speed and strong disturbance resistance,and is able to quickly realize the maximum power tracking under the sudden change of wind speed.

关 键 词：永磁直驱风力发电系统 最大功率跟踪 超局部模型 固定时间滑模控制 

分 类 号：TM315[电气工程—电机] TN710[电子电信—电路与系统]