DC-DC 降压变换器幂次等速趋近律滑模控制  

Sliding-mode Control with Power Constant Reaching Law for DC-DC Buck Converter

作　　者：李军军[1] 周瑞平 刘冲[1] 唐代卫 LI Junjun;ZHOU Ruiping;LIU Chong;TANG Daiwei(Merchant Marine College,Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]上海海事大学商船学院,上海201306

出　　处：《电力系统及其自动化学报》2020年第11期30-34,共5页Proceedings of the CSU-EPSA

基　　金：上海市科委地方院校能力建设资助项目(18040501700)。

摘　　要：为实现对降压(Buck)变换器输出电压的快速响应及精确控制,削弱传统滑模电压控制SMVC(slidingmode voltage control)的抖振现象,提出一种新型趋近律。通过引入系统状态变量和滑模面系数,重新设计趋近律中的趋近参数,并用幂次趋近的方法取代等速趋近律中的开关函数,利用新型趋近律设计滑模控制器。分析了新型趋近律参数对系统稳态精度和动态响应速度的影响。仿真结果表明,与等速趋近律、PI控制方法相比较,新型控制律输出电压波形比较稳定,动态响应更快,能有效地减少系统抖振以及超调现象。To realize a fast response to the output voltage from a Buck converter as well as its precise control,and weak⁃en the chattering phenomenon under the traditional sliding-mode voltage control(SMVC),a novel reaching law is put forward.The reaching parameters of the reaching law are redesigned by the introduction of system state variables and sliding-mode surface coefficients.In addition,a sliding-mode controller is designed based on the novel reaching law,in which the approach of power reaching is employed instead of the switching function in the constant reaching law.The in⁃fluences of parameters of the novel reaching law on the steady-state accuracy and dynamic response speed of the control system are analyzed.Simulation results show that compared with the constant reaching law and the PI control method,the proposed novel reaching law can realize stable waveforms of output voltage,a faster dynamic response,less chatter⁃ing,and smaller overshoot.

关 键 词：降压变换器 滑模控制 新型趋近律 稳态精度 动态响应 

分 类 号：TM461.3[电气工程—电器]