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Buck变换器的鲁棒离散积分滑模控制 预览

Robust Discrete Integral Sliding Mode Control for Buck Converters
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摘要 Buck变换器在受到参数摄动和外部负载扰动时,传统电压PI控制无法获得满意的动态响应和抗扰性,且传统滑模控制多基于连续时间域和电压单闭环设计,不仅在离散实现时存在稳定性问题,而且电压动态特性较双闭环控制差得多。为此,提出Buck变换器的一种鲁棒离散积分滑模(DISM)电压控制策略。首先,在保留传统双闭环控制电流内环的基础上,重建含集中扰动的离散电压模型,设计全局鲁棒性DISM电压控制器,提高了输出电压的动态品质和抗扰性。其次,利用“延迟扰动估计”策略对集中扰动进行在线估计和补偿,使得控制器可工程实现并抑制滑模抖振。最后,给出所提出控制器的稳定性分析和参数设计准则,并与传统电压PI控制进行仿真和实验对比,验证了所提控制器优越性。 The conventional PI voltage control of buck converter cannot obtain satisfying dynamic responses and anti-disturbance ability under parameter variations and load disturbances.Moreover,the traditional sliding mode control is often designed based on continuous-time voltage single loop,resulting in discretization stability problems and poor voltage dynamic performance in comparison to double closed-loop control.Thus,this paper proposes a robust discrete integral sliding mode(DISM)voltage control scheme for Buck converters.Firstly,a discrete voltage model with lumped disturbance is rebuilt while preserving the current inner loop in the traditional double closed-loop control,and a novel global-robustness DISM voltage controller is designed to improve the dynamic quality and anti-disturbance ability of the output voltage.Then,a‘delay disturbance estimation’strategy is used to estimate and compensate the lumped disturbance online,achieving the engineering implementation of the controller and the chattering suppression of sliding mode control.Finally,the stability analysis and parameter design procedures of the proposed controller are given.Its superiority is verified by comparative simulations and experiments with conventional PI voltage control.
作者 郑长明 张加胜 许睿 张国程 Zheng Changming;Zhang Jiasheng;Xu RuiZhang;Guocheng(College of Information and Control Engineering China University of Petroleum(East China),Qingdao,266580,China;School of Mechanical and Electrical Engineering Qingdao Huanghai University,Qingdao,266427,China)
出处 《电工技术学报》 EI CSCD 北大核心 2019年第20期4306-4313,共8页 Transactions of China Electrotechnical Society
基金 国家自然科学基金面上项目(51777216) 山东省重点研发计划(2016GGX104012)资助项目。
关键词 BUCK 变换器 鲁棒控制 离散积分滑模 扰动估计 Buck converter robust control discrete integral sliding mode disturbance estimation
作者简介 郑长明,男,1991年生,博士研究生,研究方向为永磁同步电机与并网逆变器控制等。E-mail:jsxzzcm@126.com;通信作者:张加胜,男,1957年生,教授,博士生导师,研究方向为电力电子与电力传动。E-mail:zjsycy2003@126.com。
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