基于回流功率优化的直流微网DC-DC变流器超螺旋滑模控制  

Super Twisting Sliding Mode Control of DC Microgrid DC-DC Converter Based on Backflow Power Optimization

作　　者：陶海军[1,2] 赵蒙恩 郑征[1,2] 张晨杰 宋佳瑶 黄涛 TAO Haijun;ZHAO Mengen;ZHENG Zheng;ZHANG Chenjie;SONG Jiayao;HUANG Tao(School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454003,Henan Province,China;Henan International Joint Laboratory of Direct Drive and Control of Intelligent Equipment(Henan Polytechnic University),Jiaozuo 454003,Henan Province,China;Dipartimento Energia,Politecnico di Torino,Torino 10129,Italy)

机构地区：[1]河南理工大学电气工程与自动化学院,河南省焦作市454003 [2]河南省智能装备直驱技术与控制国际联合实验室(河南理工大学),河南省焦作市454003 [3]都灵理工大学能源系,意大利都灵10129

出　　处：《电网技术》2024年第8期3502-3514,I0150,I0151,共15页Power System Technology

基　　金：国家自然科学基金项目(U1804143);河南省科技攻关项目(222102220014)。

摘　　要：针对直流微网系统中双有源桥直流变换器在系统发生扰动时动态特性差及在单移相调制下变换器效率不高等问题,该文在扩展移相调制下提出一种结合回流功率优化的超螺旋滑模控制策略。首先,分析双有源全桥(dual-active-bridge,DAB)变换器在扩展移相调制下两种模式的传输功率、回流功率数学模型及软开关特性,并以传输功率数学模型为基础建立DAB变换器的降阶模型。其次,以回流功率作为目标函数,以传输功率和软开关特性作为约束条件,通过Karush-Kuhn-Tucker(KKT)条件法寻找最优移相比组合;利用DAB变换器降阶模型设计超螺旋滑模控制中的等效部分,采用超螺旋算法作为切换部分,这两部分与内移相比D1共同作用生成外移相比D2,用于调节变换器的输出电压。最后进行了仿真及实验验证,实验结果表明:在负载投切、输入电压突变、参考电压改变时变换器具有良好的动态性能,同时能有效地减小回流功率。Aiming at the poor dynamic characteristics of the dual active bridge DC converter in the DC microgrid system when the system is disturbed and the low efficiency of the converter under the single phase-shift modulation,this paper proposes a super twisting sliding mode control strategy combined with the backflow power optimization under the extended phase-shift modulation.Firstly,the transmission power,the backflow power mathematical model and the soft-switching characteristics of the two modes of the dual-active-bridge(DAB)converter under the extended phase-shift modulation are analyzed,and the reduced-order model of the DAB converter is established based on the transmission power mathematical model.Secondly,with the backflow power as the objective function and the transmission power and soft-switching characteristics as the constraints,the optimal combination of the shift phases is found through the Karush-Kuhn-Tucker conditional method;The DAB converter reduced order model is used to design the equivalent part in the super twisting sliding mode control and the super twisting algorithm is used as the switching part.These two parts work together with the inner shifting ratio D1 to generate the outer shifting ratio D2,which is used to adjust the output voltage of the converter.Finally,the simulation and experimental verification is carried out,and the results show that the converter has a good dynamic performance when the load is switched,the input voltage changes suddenly,and the reference voltage changes,effectively reducing the backflow power.

关 键 词：双有源桥直流变换器 超螺旋滑模控制 动态性能 KKT条件法 回流功率 

分 类 号：TM721[电气工程—电力系统及自动化]