Current stress optimization of dual Buck-Boost integrated DAB three-port DC-DC converter

doi:10.3785/j.issn.1008-973X.2022.07.018

Journal of ZheJiang University (Engineering Science)

2022, Vol. 56

Issue (7): 1425-1435, 1472 DOI: 10.3785/j.issn.1008-973X.2022.07.018

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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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

Received: 19 July 2021 Published: 26 July 2022

CLC:

TM 46

Fund: 国家自然科学基金资助项目 ( 52077199 )

Corresponding Authors: Jian-jiang SHI E-mail: 11710055@zju.edu.cn;jianjiang@zju.edu.cn

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Cite this article:

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.

URL:

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

双Buck-Boost集成DAB型三端口直流变换器电流应力优化

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

Fig.1 Topology of TPC

Fig.2 Control method of TPC

Fig.3 Switching states

Fig.4 Working range of each mode

Fig.5 Voltage waveforms of high-frequency transformer on primary and secondary sides

Fig.6 Main waveforms of mode 4

Fig.7 Ranges of transmission power for different modes

Fig.8 Running area partition

Fig.9 Current stress before optimization when k = 0.6

Fig.10 Current stress after optimization when k = 0.6

Fig.11 Current stress before optimization when k = 1.2

Fig.12 Current stress after optimization when k = 1.2

Fig.13 Current stress optimization control block diagram

Fig.14 Flow chart of current stress optimization control

Tab.1 Comparison of parameters before and after current stress optimization

Tab.2 Comparison of power loss of switches (S₁-S₈ ) before and after current stress optimization

Fig.15 Misjudgment area under error parameter

Fig.16 Control precision when k_e = 1.1

Fig.17 Experimental platform of TPC

Fig.18 Comparison waveforms before and after optimization in first operating area when k = 0.6

Fig.19 Comparison waveforms before and after optimization in second operating area when k = 0.6

Fig.20 Comparison waveforms before and after optimization in third operating area when k= 0.6

Fig.21 Comparison waveforms before and after optimization in second operating area when k= 1.1

Fig.22 Comparison waveform before and after optimization in third operating area when k = 1.1

Fig.23 Experimental waveforms of online switching between different working areas under k = 0.6

Fig.24 Experimental waveforms of online switching between different working areas under k = 1.1

Fig.25 Curve of TPC output power-efficiency


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[1]	Rong-chuang WANG,Shan-shan WANG,Ming GAO,Jian-jiang SHI. Three-port DC-DC converter based on LCL resonant dual active bridge and its decoupling control[J]. Journal of ZheJiang University (Engineering Science), 2021, 55(8): 1585-1593.

[2]	Yi-jia ZHAO,Yun-jian WANG,Yao-dong WANG,Wei ZHANG. Power prediction control of ISOP based on single phase shift control[J]. Journal of ZheJiang University (Engineering Science), 2020, 54(1): 160-168.

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