基于电压跟随的模块化DAB控制策略  

Modular DAB control strategy based on voltage following

作　　者：秦袁 郝正航[1] 陈卓[1] 滕飞 孔德政 崔子轩 QIN Yuan;HAO Zhenghang;CHEN Zhuo;TENG Fei;KONG Dezheng;CUI Zixuan(College of Electrical Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学电气工程学院,贵阳550025

出　　处：《智能计算机与应用》2022年第10期107-112,共6页Intelligent Computer and Applications

基　　金：第二批国家级新工科研究与实践项目(E-NYDQHGC20202227)。

摘　　要：针对双有源全桥DC-DC变换器其输入电压和输出电压不成比例以及由此引起的模块化DAB传输功率不平衡的现象,文章以单移相控制下的DAB为研究对象,以功率正向流动为例,提出一种电压跟随的控制策略。通过设置输入电压反馈系数和输出电压反馈系数,保证DAB输出电压与输入电压始终成比例,在控制输出电压的同时,稳定输入电压,并针对基于模块化直流侧电压不均衡的问题,设计加入均压环节。同时对系统存在静差、动态性能不稳定的问题,在反馈环节加入控制器,改善了系统的性能。最后搭建模型,通过仿真实验,验证所提出方法可以在模块化前提下实现直流侧均压,输出电压与输入电压始终符合给定的比例,提高系统运行的稳定性,改善系统的动态性能。Aiming at the phenomenon that the input voltage and output voltage of dual active full bridge DC-DC converter are not proportional and the modularized DAB transmitted power imbalance caused by this phenomenon, this paper takes DAB under the control of single phase shift as the research object, and takes forward power flow as an example to propose a voltage following control strategy. Input voltage feedback coefficient and output voltage feedback coefficient are set to ensure that the DAB output voltage is always proportional to the input voltage, and the input voltage is stabilized while the output voltage is controlled. In view of the problem of voltage imbalance on the modular DC side, voltage equalization is designed and added. At the same time, to solve the problems of static error and dynamic performance instability of the system, the controller is added in the feedback link to improve the performance of the system. Finally, the model is built and the simulation experiment is carried out to verify that the proposed method can realize voltage equalization on the DC side under the modularization premise, and the output voltage and input voltage always conform to the given ratio, so as to improve the stability of system operation and dynamic performance of the system.

关 键 词：模块化 双有源全桥DC-DC变换器 电压跟随 反馈系数 

分 类 号：TM743[电气工程—电力系统及自动化]