一种基于滑模变结构的电压型SEPIC变换器混沌控制方法  

A chaos control method of voltage-controlled SEPIC converters based on sliding mode

作　　者：龚仁喜[1] 王奇 黎洛琦 GONG Renxi;WANG Qi;LI Luoqi(School of Electrical Engineering,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学电气工程学院,南宁530004

出　　处：《电测与仪表》2024年第7期177-183,共7页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(61561007);广西自然科学基金资助项目(2017GXNSFAA198168)。

摘　　要：针对高阶电压控制型开关功率变换器的非线性特征,提出了一种抑制DCM模式SEPIC变换器中混沌现象的滑模控制方法。该方法根据DCM模式SEPIC变换器的工作模式特点在状态变量的选取上进行改进,使相应的相轨迹在DCM模式下均能进入滑模面,并根据滑模函数的存在条件,选取相应的滑模系数。引入自适应滞环控制,通过设置滞环上下限,达到稳定开关频率的目的,实现对系统的混沌控制。通过搭建系统的Simulink模型对方法进行的仿真结果表明:该方法即使在系统出现较大扰动的情况下也能使系统稳定地运行于单周期态,且具有动态响应速度快,输出纹波小等特点。Aiming at the nonlinear characteristics of high-order voltage-controlled converters,a sliding mode control method to suppress the chaos in the DCM-mode SEPIC converter is proposed.The method firstly improves the selection of state variables according to the operation mode characteristics of the DCM-mode SEPIC converter,so that the corresponding phase trajectories can enter the sliding surface in the DCM-mode,and select the corresponding sliding mode coefficient according to the existence conditions of the sliding mode function.Then,the adaptive hysteresis control is introduced.By setting the upper and lower limits of the hysteresis,the purpose of stabilizing the switching frequency is achieved.Finally,the chaos control of the system is realized.The simulation results of the method by building the Simulink model of the system show that the proposed method can make the system run stably in a single-period state even in the case of large disturbances in the system,and has the characteristics of fast dynamic response and small output ripple.

关 键 词：混沌控制 滑模变结构控制 SEPIC变换器 

分 类 号：TM743[电气工程—电力系统及自动化]