PWM结合移相控制下的混合三电平隔离型双向DC-DC变换器反馈线性化控制研究  

Research on Hybrid Three-level Isolated Bidirectional DC-DC Converter Feedback Linearization Control Under PWM-phase-shifting Control

作　　者：杨超 许海平[1,2] 袁志宝 许志强 YANG Chao;XU Haiping;YUAN Zhibao;XU Zhiqiang(Key Laboratory of Power Electronics and Electric Drive(Institute of Electrical Engineering,Chinese Academy of Sciences),Haidian District,Beijing 100190,China;University of Chinese Academy of Sciences,Shijingshan District,Beijing 100049,China;Green Energy Technology of China(Beijing)Co.,Ltd.,Haidian District,Beijing 102200,China)

机构地区：[1]中国科学院电力电子与电气驱动重点实验室(中国科学院电工研究所),北京市海淀区100190 [2]中国科学院大学,北京市石景山区100049 [3]北京中科绿能科技有限公司,北京市海淀区102200

出　　处：《电网技术》2020年第6期2321-2329,共9页Power System Technology

基　　金：北京市科学技术委员会重点资助项目(D171100005317003)。

摘　　要：双向隔离型DC-DC变换器是电力电子变压器(power electronic transformer,PET)的一个重要环节。文章针对混合三电平双向DC-DC的结构特点提出一种新的基于脉冲宽度调制(pulsewidthmodulation,PWM)加移相的控制方法(PWMphaseshift,PPS),该方法能够减少控制变量,简化系统控制。在此基础上,通过分析PPS控制方法下系统工作模态的等效电路模型,建立系统的非线性大信号模型。通过对非线性系统反馈线性化,推导出系统状态反馈表达式,将系统的耦合控制变量进行解耦,得到系统的控制规则。最后搭建了实验平台,通过实验结果证明了该控制方法的正确性和有效性。Bidirectional DC-DC is an important part of power electronic transformer(PET).In this paper,a new PWM Phase Shift(PPS)control method was proposed to reduce the control variables and simplify the system control according to the structure characteristics of hybrid three-level bidirectional DC-DC.Based on this method,the non-linear large statespace-averaged signal model of the system is established by analyzing the equivalent circuit model of the working mode of the system under the PPS control method.Then the feedback linearization of the nonlinear system is carried out according to the differential geometry theorem,and the state feedback expression of the system is derived.The coupling control variables of the system are decoupled and the control rules of the system are obtained.Finally,an experimental platform is built,and the experimental results show that the control method is correct and effective.

关 键 词：电力电子变压器 混合三电平双向DC-DC变换器 非线性控制 状态反馈线性化 

分 类 号：TM721[电气工程—电力系统及自动化]