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浙江大学学报(工学版)
浙江大学学报(工学版)  2022, Vol. 56 Issue (7): 1425-1435, 1472    DOI: 10.3785/j.issn.1008-973X.2022.07.018
电气工程、机械工程     
双Buck-Boost集成DAB型三端口直流变换器电流应力优化
王杉杉(),高明,石健将*()
浙江大学 电气工程学院，浙江 杭州 310027
Current stress optimization of dual Buck-Boost integrated DAB three-port DC-DC converter
Shan-shan WANG(),Ming GAO,Jian-jiang SHI*()
College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
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摘要：

针对双Buck-Boost集成双有源桥型三端口直流变换器高频链的电流应力优化问题，提出相应的控制方法. 为了实现对各个端口电压与功率的调节，高频变压器原边采用占空比控制，原、副边之间采用移相控制. 副边2个桥臂之间的内移相角可以作为第3个控制量，以实现优化控制目标；提出在传统控制方法的基础上引入副边桥臂间的内移相控制，实现优化高频链电流应力的效果. 建立三端口直流变换器高频链各模式下电流应力优化问题的数学模型，给出电流应力优化的实现条件. 搭建500 W的实验样机，对所提的电流应力优化控制方法进行实验验证. 结果表明，利用该方法可以有效地降低高频链的电流应力，提升系统效率，负载端口轻载时的效果更加明显.
关键词： 三端口DC-DC变换器;  双有源桥;  移相控制;  内移相控制;  电流应力优化    
Abstract:

A corresponding control method was proposed aiming at the optimization of the current stress of the high-frequency chain of the three-port DC-DC converter which integrated dual Buck-Boost and dual-active-bridge. Duty ratio control was adopted on the primary side of the high-frequency transformer, and phase shift control was adopted between the primary side and the secondary side in order to realize the adjustment of voltage and power of each port. The internal phase shift angle between the secondary side bridge arms could be used as the third control object to achieve the optimal control. The phase shift control on the secondary side was introduced based on the traditional control method in order to achieve the effect of optimizing the current stress of the high-frequency link. The mathematical model of the current stress optimization problem in each mode of the three-port DC-DC converter was established, and the realization conditions of the current stress optimization were given. A 500 W experimental prototype was constructed to verify the proposed optimal control method of current stress. The experimental results show that the method can effectively reduce the current stress of the high-frequency link and improve the system efficiency. The method has a more obvious effect when the output port is lightly loaded.
Key words: three-port DC-DC converter    dual-active-bridge    phase shift control    internal phase shift control    current stress optimization
收稿日期: 2021-07-19 出版日期: 2022-07-26
CLC:  TM 46  
基金资助: 国家自然科学基金资助项目 ( 52077199 )
通讯作者: 石健将     E-mail: 11710055@zju.edu.cn;jianjiang@zju.edu.cn
作者简介: 王杉杉 （ 1990—），女，博士生，从事三端口直流变换器的研究. orcid.org/0000-0001-9394-4518. E-mail： 11710055@zju.edu.cn
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引用本文:

王杉杉,高明,石健将. 双Buck-Boost集成DAB型三端口直流变换器电流应力优化[J]. 浙江大学学报(工学版), 2022, 56(7): 1425-1435, 1472.

Shan-shan WANG,Ming GAO,Jian-jiang SHI. Current stress optimization of dual Buck-Boost integrated DAB three-port DC-DC converter. Journal of ZheJiang University (Engineering Science), 2022, 56(7): 1425-1435, 1472.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2022.07.018    或    https://www.zjujournals.com/eng/CN/Y2022/V56/I7/1425

图 1  TPC拓扑结构
图 2  TPC控制方法
图 3  开关状态图
图 4  各种模式的工作范围
图 5  高频变压器的原、副边电压波形
图 6  模式4的主要波形
图 7  各模式下的传输功率标幺值的取值范围
图 8  运行区域分区
图 9  k = 0.6时的优化前电流应力
图 10  k = 0.6时的优化后电流应力
图 11  k = 1.2时的优化前电流应力
图 12  k = 1.2时的优化后电流应力
图 13  电流应力优化控制框图
图 14  电流应力优化控制的流程图
实验
编号 		k iS1RMS/A iS2RMS/A iS5RMS/A iLRMS/A
优化
前 		优化
后 		优化
前 		优化
后 		优化
前 		优化
后 		优化
前 		优化
后
1 0.6 12.4 12.0 12.4 12.0 4.2 4.0 17.6 17.2
2 0.6 12.2 10.9 8.7 8.3 3.6 3.2 15.1 13.5
3 0.6 11.7 8.8 5.4 5.1 3.1 2.4 13.0 10.5
4 1.1 6.5 5.5 4.5 4.4 1.9 1.2 7.9 7.0
5 1.1 5.2 3.9 3.1 2.9 1.5 1.1 6.0 4.7
表 1  电流应力优化前、后的参数对比
实验编号 k Pon/W Pswitch/W Ploss/W
优化前 优化后 优化前 优化后 优化前 优化后
1 0.6 28.2 27.2 4.5 2.5 32.7 29.7
2 0.6 20.5 17.5 4.4 3.0 24.9 20.5
3 0.6 15.3 9.9 4.1 2.5 19.4 12.4
4 1.1 5.6 4.5 2.8 2.4 8.4 6.9
5 1.1 3.3 2.1 2.4 1.7 5.7 3.8
表 2  电流应力优化前、后S1-S8开关管损耗的对比
图 15  误差下的误判区域
图 16  ke = 1.1时的控制精度
图 17  TPC实验平台
图 18  k = 0.6下优化前、后的对比波形（运行区域I）
图 19  k = 0.6下优化前、后的对比波形（运行区域II）
图 20  k= 0.6下优化前、后的对比波形（运行区域III）
图 21  运行区域II，k= 1.1下优化前、后的对比波形
图 22  运行区域III，k = 1.1下优化前、后的对比波形
图 23  k = 0.6下不同运行区域的在线切换实验波形
图 24  k = 1.1下不同运行区域的在线切换实验波形
图 25  TPC输出功率-效率曲线图
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