基于平坦理论的耦合SIDO Buck变换器改进自抗扰解耦控制  

Improved self-disturbance rejection decoupling control of coupled SIDO Buck converter based on flatness theory system

作　　者：皇金锋[1] 章乾 HUANG Jinfeng;ZHANG Qian(School of Electrical Engineering,Shaanxi University of Technology,Hanzhong 723001,China)

机构地区：[1]陕西理工大学电气工程学院,陕西汉中723001

出　　处：《电机与控制学报》2025年第1期142-155,共14页Electric Machines and Control

基　　金：陕西省自然科学基础研究计划(2023-JC-YB-442)。

摘　　要：为了解决耦合单电感双输出(CI-SIDO)Buck变换器输出支路间存在交叉影响和系统瞬态响应慢的问题,提出一种基于平坦理论的改进自抗扰解耦控制策略。首先,基于平坦理论将CI-SIDO Buck变换器构建为两个耦合的平坦子系统。其次,内环基于平坦模型设计改进型自抗扰控制对系统进行解耦,采用可抑制“微分峰值”现象和含有扰动微分项的增阶变增益扩张状态观测器(IVG-ESO)和超螺旋滑模反馈控制律对内环耦合项以及未建模扰动和不确定扰动进行观测和补偿,以此实现内环的解耦;外环基于平坦模型设计微分平坦控制,采用增阶变增益扩张状态观测器对输出电压和负载电流进行估计,并结合微分平坦控制对外环进行控制。最后,搭建了实验平台对所提控制策略进行了实验验证。实验结果表明,该控制有效抑制了支路间的交叉影响,并提高了系统的响应速度。In order to solve the problems of cross-influence between the output branches of the coupled single inductor dual output(CI-SIDO)Buck converter and the slow transient response of the system,an improved self-impedance decoupling control strategy based on flat theory was proposed.First,the CI-SIDO Buck converter was constructed as two coupled flat subsystems based on flat theory.Second,the inner loop was decoupled based on the flat model by designing an improved self-immune control,an increasing-order variable-gain expanded state observer(IVG-ESO)that suppresses the“differential peak”phenomenon and contains perturbation differential terms,and a super-twisting sliding-mode feedback control law that observes and compensates for the coupling terms as well as unmodeled and uncertain perturbations in the inner loop,so as to realize the inner-loop coupling terms as well as the unmodeled and uncertain perturbations.The decoupling of the inner loop was realized by observing and compensating the coupling terms as well as the unmodeled disturbances and uncertain disturbances in the inner loop;the differential flat control was designed for the outer loop based on the flat model,and the incremental variable gain expansion state observer was used for estimating the output voltage and the load current in combination with the differential flat control.Finally,an experimental platform was built to experimentally verify the proposed control strategy.The experimental results show that the control effectively suppresses the cross-influence between the branches and improves the response speed of the system.

关 键 词：耦合单电感双输出 微分平坦系统 超螺旋滑模控制 改进自抗扰控制 解耦控制 

分 类 号：TM46[电气工程—电器]