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
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.
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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2017, Vol. 32 
