BUCK变换器滑模控制研究仿真  

Research and Simulation of Sliding Mode Control of BUCK Converter

作　　者：付伟业 Weiye Fu(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海

出　　处：《建模与仿真》2025年第1期430-439,共10页Modeling and Simulation

摘　　要：本文详细讨论了BUCK型降压变换器的滑模变结构控制理论,推导了描述buck变换器的动力学方程,并设计了一种滑模控制(SMC)下的buck变换器。当负载和输入电压在一定程度上发生突变时,该控制器依然能够控制系统使其稳定输出期望电压。此外还提出一种新的方法,采用双闭环控制,即一个内环电流控制和一个外环电压控制。电流环采用滑模控制,电压环采用线性PI控制,并对这两种控制器在负载阶跃变化和输入电压变化情况下进行对比,采用Matlab/Simulink进行仿真,实验结果表明该方法能有效降低Buck变换器的稳态误差,提高其动态响应以及系统的抗干扰能力,增强其对负载突变和输入电压波动的鲁棒性。This article provides an in-depth discussion of the sliding mode variable structure control theory for buck converters and derives the dynamic equations that describe the behavior of such converters.A novel sliding mode control(SMC)strategy for buck converters is introduced,specifically designed to maintain stable output voltage despite sudden changes in load and input voltage.Moreover,the paper proposes a dual-loop control approach,comprising an inner current control loop and an outer voltage control loop.The current loop utilizes sliding mode control,while the voltage loop employs linear PI(Proportional-Integral)control.The performance of these two control strategies is compared under conditions of load step changes and input voltage variations.Simulations are conducted using Matlab/Simulink,demonstrating that the proposed method significantly reduces the steady-state error of the buck converter,enhances its dynamic response,and improves the system’s immunity to disturbances,thus increasing its robustness against load surges and input voltage fluctuations.

关 键 词：滑模控制器 BUCK转换器 PI调节 双闭环控制 

分 类 号：TM46[电气工程—电器]