DC-DC降压转换器控制系统虚拟实验平台设计

Design of virtual test platform for DC-DC buck converter control system

为了研究DC-DC降压转换器的输出电压调节问题,利用Matlab软件的图形用户开发工具GUI设计了基于DC-DC降压转换器控制系统的虚拟仿真实验测试平台。同时利用可视化仿真工具Simulink在后台搭建了基于连续滑模控制算法的系统仿真模型。考虑到DC-DC降压转换器系统的输出电压通常会遭受参考电压和负载电阻变化的影响,为了显示所推荐控制方法的优越性,设计了基于传统双闭环PI控制和所推荐连续滑模控制的两组对照实验。实验结果验证了所搭建控制系统模型的正确性和整个实验平台的有效性。该实验平台既着重介绍了DC-DC降压转换器和PI控制方法的基础知识,又特别引入了先进的连续滑模控制方法,有效支持了自动控制原理课程的建模和控制分析实验。

In order to address the output voltage regulation problem of the DC-DC buck converter,a virtual simulation test platform is constructed based on the dynamic model of the DC-DC buck convert-er and the graphical user development tool GUI of the Matlab software.At the same time,a visual sim-ulation tool Simulink was employed to design a continuous sliding mode control algorithm in the back-ground.Considering that the output voltage of a DC-DC buck converter system is usually affected by the changing reference voltage and load resistance,to demonstrate the superiority of the recommended control method,two sets of tests based on the traditional cascaded PI control and the proposed continu-ous sliding mode control scheme are carried out,respectively.The results verify the correctness of the control system and the effectiveness of the overall experimental platform.The experimental platform not only introduces the basic knowledge of DC-DC buck converter and PI control method,but also propo-ses advanced continuous sliding mode control method,which effectively supports the modeling and con-trol experiments of automatic control principle course.