电工技术学报  2017, Vol. 32 Issue (14): 66-76    DOI: 10.19595/j.cnki.1000-6753.tces.170628
大容量电力电子混杂系统多时间尺度动力学表征与运行机制专题
(特约主编:赵争鸣 教授)
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一种基于损耗模型的双有源桥DC-DC变换器效率优化方法
李婧, 袁立强, 谷庆, 孙建宁, 段任之
清华大学电机系 电力系统及发电设备安全控制和仿真国家重点实验室 北京 100084
An Efficiency Optimization Method in Dual Active Bridge DC-DC Converter Based on Loss Model
Li Jing, Yuan Liqiang, Gu Qing, Sun Jianning, Duan Renzhi
State Key of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China
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摘要 对双有源桥DC-DC变换器(DAB)系统中的各部分损耗进行建模,并依据此模型,以提升效率为目标,对DAB系统进行优化设计。首先,介绍单移相调制策略下的DAB工作原理,并推导漏电感电流有效值的解析表达式。为突出DAB的电流波形特征,引入电压转换比的概念,这一概念与变压器匝比相关。然后,介绍损耗建模方法。DAB系统的损耗主要分为两部分,一部分源于半导体器件;另一部分源于高频隔离变压器及电感。两者的损耗数值不仅由本身的材料特性决定,同时与运行工况紧密相关,如传输功率、电压、电流等。将单移相调制下的DAB电流、电压波形特征,与器件和变压器的本身特性结合考虑,解析建立DAB的稳态损耗模型。并在此基础上,通过数值计算的方法,对电压转换比进行优化设计,同时优化移相比的选择,增强软硬件的适配性,提升DAB的整体效率。最后,通过实验对所建损耗模型及优化方法进行了验证。
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李婧
袁立强
谷庆
孙建宁
段任之
关键词 双有源桥DC-DC变换器损耗模型高频隔离变压器电压转换比效率优化    
Abstract:This paper focuses on the loss model and efficiency optimization of dual active bridge (DAB) DC-DC converter. First, the single phase modulation principle is shown and the current RMS value is derived analytically. Voltage transfer ratio is introduced to characterize the current waveform, which is related to the transformer ratio. The energy loss of DAB can be divided into two parts, one from device power dissipations, and the other from power loss in electromagnetic elements, such as the transformer and inductance. Their loss values are both related to material choices, and also affected by operation states including transfer power, voltage and current value. Combined the current and voltage waveforms with element material features, DAB loss model is built in a steady operation. Furthermore, by numerical calculation of the loss model, voltage transfer ratio and phase shift duty are optimized aiming at high efficiency. At last, a 4kW-DAB platform is built and the optimization method is tested by experimental results.
Key wordsDual    active    bridge    (DAB)    DC-DC    converter,    loss    model,    high    frequency    isolated    transformer,    voltage    transfer    ratio,    efficiency    optimization   
收稿日期: 2017-05-12      出版日期: 2017-08-01
PACS: TM46  
基金资助:国家自然科学基金重大项目资助(51490680,51490683)
作者简介: 作者简介
引用本文:   
李婧, 袁立强, 谷庆, 孙建宁, 段任之. 一种基于损耗模型的双有源桥DC-DC变换器效率优化方法[J]. 电工技术学报, 2017, 32(14): 66-76. Li Jing, Yuan Liqiang, Gu Qing, Sun Jianning, Duan Renzhi. An Efficiency Optimization Method in Dual Active Bridge DC-DC Converter Based on Loss Model. Transactions of China Electrotechnical Society, 2017, 32(14): 66-76.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.170628          https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I14/66