一种鲁棒无抖颤滑模控制的Buck-Boost变换器  

A Robust Chattering-Avoiding Sliding Mode Control for Buck-Boost Converter

作　　者：皇甫宜耿[1] 吴宇[2] 马瑞卿[1] 

机构地区：[1]西北工业大学,陕西西安710072 [2]重庆大学,重庆沙坪坝400044

出　　处：《西北工业大学学报》2014年第2期285-289,共5页Journal of Northwestern Polytechnical University

基　　金：教育部博士点新教师基金(20126102120050);陕西省国际科技合作重点项目计划(20121203202758)资助

摘　　要：利用风、光、氢等新能源发电过程中,经常遇到能量输入和功率输出的随机性,这对电源变换器鲁棒性设计提出了更高要求。针对传统滑模控制变换器由于自身控制律的离散型存在不可避免的抖颤问题,基于一种Super-Twisting控制算法设计无抖颤滑模变换器,其核心思想是将离散控制律转移至更高阶的滑模面,从本质上消除抖颤的影响。以电源变换器Buck-Boost为例,针对新能源发电中存在的间歇性扰动问题,与典型PI控制效果进行对比试验。仿真结果表明:1)动态滑模控制变换器在输入、输出大扰动下具有很强的鲁棒性;2)在频响跟踪方面具有快速收敛性,其变换器频响可以达到20 Hz以上,远优于传统PI控制。In the process of power generation by new energy sources, such as wind, light and hydrogen, the ran-domness of energy input and power output often appear;this puts forward higher requirements for the robust design of power converters. The power converter based on traditional sliding mode, due to its discrete control law, makes chattering phenomenon inevitable. In order to suppress the above problem, this paper presents a novel chattering-avoiding converter based on the super-twisting sliding modes. The core idea is to transfer the discrete control law to high order sliding manifold, essentially eliminating the impact of chattering effect. To remove the intermittent dis-turbance in the new energy power generation, this paper compares the effect of the converter controlled by super-twisting sliding mode controller with the classic PI controller in a typical Buck-Boost power converter as an example. The simulation results and their analysis show preliminarily that： （1） under the condition of large disturbances in input and output, the converter controlled by super-twisting sliding mode has stronger robustness;（2） in response tracking, the converter has a faster convergence;the frequency response can reach more than 20 Hz, far superior to the classic PI control.

关 键 词：Super—Twisting滑模 鲁棒性 Buck—Boost变换器 无抖颤 

分 类 号：TM34[电气工程—电机]