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浙江大学学报(工学版)
浙江大学学报(工学版)  2021, Vol. 55 Issue (8): 1585-1593    DOI: 10.3785/j.issn.1008-973X.2021.08.020
电气工程     
基于LCL谐振型双有源桥的三端口DC-DC变换器及其解耦控制
王荣闯(),王杉杉,高明,石健将*()
浙江大学 电气工程学院，浙江 杭州 310027
Three-port DC-DC converter based on LCL resonant dual active bridge and its decoupling control
Rong-chuang WANG(),Shan-shan WANG,Ming GAO,Jian-jiang SHI*()
College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
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摘要：

为了降低集成式三端口DC-DC变换器多功率路径的控制环路间的耦合程度、优化动态性能，将双Buck/Boost与LCL谐振型双有源桥通过共用原边全桥开关单元集成到一起，提出新型三端口DC-DC变换器及其解耦控制方法. 该变换器实现了开关器件的复用，提高了功率密度；采用PWM+双移相控制，可以实现3个端口间传输功率的灵活控制；利用LCL谐振特性实现基波功率因数为1的功率传递. 本研究分析该变换器的工作原理、控制方式与谐波特性，并且根据基波分析法提出简单、有效的解耦控制方法，可以有效降低多功率路径间的耦合程度，提高系统动态响应能力；搭建400 W的实验样机，进行控制方式对比试验、典型工作模式切换试验、解耦控制对比试验，验证该变换器的可行性及所提解耦控制策略的解耦效果.
关键词： 三端口DC-DC变换器;  LCL谐振型双有源桥;  双Buck/Boost;  PWM+双移相;  解耦控制    
Abstract:

A new three-port DC-DC converter and its decoupling control method were proposed, in order to reduce the coupling degree of different control loops of multiple power paths and optimize the dynamic performance of the integrated three-port DC-DC converter. Dual Buck/Boost and LCL resonant dual active bridge were combined by reusing primary switching units. Switch devices were reused in the converters and power density was improved. Power transmission between three ports was controlled flexibly by PWM and dual phase-shift control mode. Power was transfered with fundamental power factor of 1 based on LCL resonant characteristics. The working principle, control mode and harmonic performance of the converter were analyzed. A simple and effective decoupling control method was proposed according to the fundamental analysis method, which can effectively reduce the coupling degree of different control loops of multiple power paths and improve the dynamic response ability of the system. Finally, a 400 W experimental prototype was built. Control mode comparison test, typical working mode switching test and decoupling control comparison test were carried out to verify the feasibility of the converter and the effect of the decoupling control method.
Key words: three-port DC-DC converter    LCL resonant dual active bridge    dual Buck/Boost    PWM and dual phase-shift    decoupling control
收稿日期: 2020-05-29 出版日期: 2021-09-01
CLC:  TM 46  
基金资助: 装备预研教育部联合基金资助项目（6141A02022528）
通讯作者: 石健将     E-mail: wangrongchuang@zju.edu.cn;jianjiang@zju.edu.cn
作者简介: 王荣闯（1995—），男，硕士生，从事三端口直流变换器研究. orcid.org/0000-0003-3101-562X. E-mail： wangrongchuang@zju.edu.cn
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引用本文:

王荣闯,王杉杉,高明,石健将. 基于LCL谐振型双有源桥的三端口DC-DC变换器及其解耦控制[J]. 浙江大学学报(工学版), 2021, 55(8): 1585-1593.

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. Journal of ZheJiang University (Engineering Science), 2021, 55(8): 1585-1593.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2021.08.020    或    https://www.zjujournals.com/eng/CN/Y2021/V55/I8/1585

图 1  TPC拓扑结构
图 2  等效二端口网络
图 3  变换器主要工作波形
图 4  变换器典型控制结构
图 5  原边电流谐波含量
图 6  副边电流谐波含量
图 7  谐波功率传输占比
图 8  解耦控制结构
参数 取值
开关频率 ${f_{\rm{s}}}$/kHz 25
变压器匝比1∶n 1∶3
端口1输入电压 ${{U}_1}$/V 50
端口2输入电压 ${{U}_2}$/V 17.5~32.5
端口3输出电压 ${{U}_3}$/V 150
谐振电感 ${L_{\rm{r}}}$/μH 21.5
谐振电容 ${C_{\rm{r}}}$/μF 1.88
特征阻抗 ${Z_0}$/Ω 3.38
滤波电感 ${L_{{\rm{b}}1}}$、 ${L_{{\rm{b2}}}}$/μH 250
滤波电容 ${C_{{\rm{port}}1}}$、 ${C_{{\rm{port}}2}}$、 ${C_{{\rm{port}}3}}$/μF 1000
表 1  样机主要设计参数
图 9  单、双移相控制方式对比
图 10  SIDO、DISO、SISO模式切换
图 11  不同工况下的谐振腔波形
图 12  不同工况及控制方式下解耦控制效果对比
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