考虑电流应力优化的ISOP-DAB变换器扰动均压控制策略  

Disturbance Voltage Sharing Control ofISOP-DAB Converter Considering Current Stress Optimization

作　　者：曾进辉[1] 梁博文 余雪萍 兰征 邹彬[1] 张长威 ZENG Jinhui;LIANG Bowen;YU Xueping;LAN Zheng;ZOU Bin;ZHANG Changwei(College of Electrical and Information Engineering,Hunan University of Technology,Zhuzhou 412007,Hunan Province,China)

机构地区：[1]湖南工业大学电气与信息工程学院,湖南省株洲市412007

出　　处：《电网技术》2023年第11期4448-4457,共10页Power System Technology

基　　金：湖南省自然科学基金项目(2020JJ6082,2021JJ50059);湖南省教育厅科学研究项目(21A0349);湖南省研究生科研创新项目(QL20210247)。

摘　　要：针对输入串联输出并联双有源桥(dual active bridge,DAB)变换器子模块内部参数不匹配导致的功率不平衡,以及单移相(single phase shift,SPS)控制下变换器工作效率低的问题,该文基于拓展移相(extended phase shift,EPS)控制提出一种扰动均压(disturbance voltage sharing,DVS)控制策略。通过建立EPS控制下的电流应力解析模型,求解最优电流应力对应下的内外移相比组合。进一步,设计逐级扰动方案,通过扰动模块的外移相比,对各模块内部参数失配时的输入电压进行补偿。DVS控制策略在实现串并联模块间功率平衡的前提下,降低变换器电流应力,从而提升变换器的工作效率。此外,由于无需在每个控制环路中增设输入电压传感器,系统结构更为简化,硬件成本更低。最后,通过仿真和实验验证了所提控制策略的正确性和有效性。Aiming at the power imbalance caused by the internal parameter mismatch of the sub-module of the input-series output-parallel dual active bridge(DAB)converter and the low efficiency of the converter under the single phase shift(SPS)control,this paper proposes an disturbance voltage sharing(DVS)control strategy based on the extended phase shift(EPS)control.By establishing the analytical model of current stress under the EPS control,the internal and external phase shift combination under the optimal current stress is solved.Further,a step-by-step disturbance scheme is designed to compensate the power when the internal parameters of each module are mismatched by the external phase shift of the disturbance module.The DVS control strategy reduces the current stress of the converter and improves the efficiency of the converter on the premise of realizing the power balance between the series and parallel modules.In addition,because there is no need to add the input voltage sensors in each control loop,the system structure becomes simpler and the hardware cost lower.Finally,the correctness and effectiveness of the proposed control strategy are verified by the simulation and experiments.

关 键 词：DAB变换器 输入串联输出并联 输入均压 拓展移相控制 电流应力优化 

分 类 号：TM721[电气工程—电力系统及自动化]