基于ESO的Buck型变换器趋近律控制  

A Novel Reaching Law Control for Buck Converter Based on ESO

作　　者：南余荣[1] 杨晨冰 吕炜杰 Nan Yurong;Yang Chenbing;Lv Weijie(College of Information Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]浙江工业大学信息工程学院,杭州310023

出　　处：《计算机测量与控制》2020年第3期84-88,共5页Computer Measurement &Control

摘　　要：针对Buck型变换器系统中存在的时变干扰,如输出负载波动,文章提出一种基于扩张状态观测器(ESO)的趋近律控制方法;首先,对系统中存在的时变干扰进行建模,把抑制时变干扰问题转换为抑制匹配和非匹配扰动问题;其次,设计一种扩张状态观测器,用于估计匹配和非匹配扰动;然后,根据提出的新型指数幂次趋近律设计滑模控制器,结合ESO,有效抑制时变干扰对系统的影响,并通过Lyapunov稳定性定理分析观测器的收敛性和闭环控制系统的稳定性;最后,仿真结果验证了所提方法的有效性。In this paper,a new reaching law control method based on extended state observer(ESO)is proposed for Buck converter system with time-varying disturbances,such as output load fluctuation.Firstly,the time-varying disturbances in the system are modeled,and the problem of suppressing time-varying disturbances is transformed into the problem of suppressing matched and unmatched disturbances.Secondly,ESO is designed to estimate the matched and unmatched disturbances.Combining with ESO,a new exponential power reaching law sliding mode controller is also designed to suppress the influence of time-varying disturbances for the system effectively.Then,the convergence of observer and the stability of closed-loop control system are analyzed by Lyapunov stability theorem.Finally,the simulation results verify the effectiveness of the proposed method.

关 键 词：BUCK型变换器 时变干扰 扩张状态观测器 新型指数幂次趋近律 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]