电工技术学报  2024, Vol. 39 Issue (12): 3761-3773    DOI: 10.19595/j.cnki.1000-6753.tces.230676
电力电子 |
多级离散扩展移相控制双有源桥DC-DC变换器的原理、参数设计与性能
刘赞1, 沙金1, 邱高峰1, 陈丽蓉2
1.西南交通大学电气工程学院 成都 610031;
2.圣邦微电子(北京)股份有限公司 北京 100005
Principle, Parameters Design and Performance of Multistage Discrete Extended-Phase-Shift Control Dual Active Bridge DC-DC Converters
Liu Zan1, Sha Jin1, Qiu Gaofeng1, Chen Lirong2
1. School of Electrical Engineering Southwest Jiaotong University Chengdu 610031 China;
2. Sg Micro Corp Beijing 100005 China
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摘要 该文提出一种双有源桥(DAB)DC-DC变换器的多级离散扩展移相(MD-EPS)控制,旨在提升DAB DC-DC变换器系统的动态响应性能。同时,考虑效率优化,兼顾额定功率范围、输出电压纹波等性能指标,研究MD-EPS控制的离散参数分布方式对控制性能的影响及参数设计方法。通过搭建160 W小功率实验样机对MD-EPS的控制性能进行了验证。实验结果表明,与传统扩展移相控制相比,DAB DC-DC变换器的MD-EPS控制能够大幅提升变换器系统的动态响应速度(响应时间缩短99.95%),最高效率为94.54%。
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关键词 双有源桥变换器离散移相动态性能效率    
Abstract:The DC-DC converter plays a pivotal role in renewable energy systems by serving as an interface converter connecting the DC bus and energy storage devices. The application demands a fast dynamic response to accommodate load fluctuations, voltage drops, or other external disturbances. Therefore, a multi-stage discrete extended-phase-shift (MD-EPS) control method is proposed for DAB DC-DC converters, considering peak-to-peak value current optimization during the control design. Thus, the proposed MD-EPS control can achieve both a fast dynamic response and high efficiency across a wide load range.
Firstly, this paper provides a comprehensive introduction to the principle of MD-EPS control. Different from conventional linear control methods, the proposed MD-EPS controller has (m-1) level output voltage references Uref, j (j=1,···, m-1, and m is an even number), dividing the output voltage into m output voltage intervals [Uref, j-1,Uref, j]. Each interval corresponds to preset fixed inner/outer phase-shift duty ratio signals D1, j and D2, j. At the beginning of each switching cycle, the output voltage Uo is sampled and compared with m-1 level Uref, j to determine the instantaneous output voltage's corresponding interval when Uo∈[Uref, j-1,Uref, j], D1 (D1=D1, j) and D2 (D2=D2, j) are selected as the active phase-shift duty ratio signals for the current switching cycle. Secondly, the control parameter design method is presented using the 4-level discrete extended-phase-shift (4LD-EPS) controlled DAB DC-DC converter as an example. The rated power range, output voltage ripple, and peak current optimization are considered during the parameter design. Thirdly, the steady-state performance, dynamic performance, and interference immunity of the 4LD-EPS controlled DAB DC-DC converter are explored by theoretical analysis and simulation verification. Finally, the control performance of the proposed converter is verified by a 160W low-power test prototype. The experimental results highlight a remarkable improvement in the dynamic response of the converter system, with a 99.95% reduction in recovery time and a maximum efficiency of 94.54%.
The following conclusions can be drawn through the theoretical and experimental analysis: (1) The proposed MD-EPS control offers a simple control principle, ease of implementation, fast dynamic performance, and high reliability. Moreover, compared with conventional PWM-EPS control, the proposed MD-EPS control eliminates the need for an error amplifier and corresponding compensation circuits. (2) The proposed MD-EPS controlled DAB DC-DC converter effectively minimizes current peak values, thereby achieving high efficiency.
Key wordsDual active bridge converter    discrete phase-shift    dynamic performance    efficiency   
收稿日期: 2023-05-15     
PACS: TM46  
基金资助:国家自然科学基金资助项目(52277200)
通讯作者: 沙 金 女,1987年生,副研究员,硕士生导师,研究方向为新能源接口变换器技术、开关变换器控制技术、开关变换器动力学建模与分析。E-mail: j.sha@swjtu.edu.cn   
作者简介: 刘 赞 男,2000年生,硕士研究生,研究方向为电力电子与电力传动。E-mail: liuzangege@my.swjtu.edu.cn
引用本文:   
刘赞, 沙金, 邱高峰, 陈丽蓉. 多级离散扩展移相控制双有源桥DC-DC变换器的原理、参数设计与性能[J]. 电工技术学报, 2024, 39(12): 3761-3773. Liu Zan, Sha Jin, Qiu Gaofeng, Chen Lirong. Principle, Parameters Design and Performance of Multistage Discrete Extended-Phase-Shift Control Dual Active Bridge DC-DC Converters. Transactions of China Electrotechnical Society, 2024, 39(12): 3761-3773.
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