Wide Voltage Range Dual Active Bridge DC-DC Converter and Control Strategy Implementation

2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2023-06-09 DOI:10.1109/PEDG56097.2023.10215195

Xiaofeng Yang, Rui Zhao, Lixin Liao, Yan Liu, Renbiao Nong

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Abstract

Single-phase-shift (SPS) control is one of the common control methods for dual active bridge (DAB) converter. However, when the DAB input and output voltages do not match the transformer ratio, the inductor current stress will increase, which affects the operating reliability. In order to optimize the current stress of DAB converter in wide input voltage range condition, this paper firstly proposes a DAB converter with voltage adjustment unit (VAU-DAB). The mathematical model of DAB converter is deduced to analyze the inductor current stress characteristics when the input and output voltages are mismatched. Then, the VAU and its control algorithm are introduced. VAU can adjust the input voltage in real-time, which ensure both side voltages of DAB are matched in wide input voltage range. The proposed system can optimize the current stress and improve the robustness of DAB. Finally, simulation results verify the effectiveness of the proposed VAU-DAB topology and control strategy.

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宽电压范围双有源桥 DC-DC 转换器及控制策略的实现

单相移位（SPS）控制是双主动桥（DAB）转换器的常用控制方法之一。然而，当 DAB 输入和输出电压与变压器变比不匹配时，电感电流应力会增大，从而影响运行可靠性。为了优化 DAB 转换器在宽输入电压范围条件下的电流应力，本文首先提出了一种带电压调整单元（VAU-DAB）的 DAB 转换器。推导出 DAB 转换器的数学模型，分析了输入和输出电压不匹配时的电感器电流应力特性。然后，介绍了 VAU 及其控制算法。VAU 可以实时调节输入电压，从而确保 DAB 的两端电压在宽输入电压范围内相匹配。所提出的系统可以优化电流应力，提高 DAB 的鲁棒性。最后，仿真结果验证了所提出的 VAU-DAB 拓扑和控制策略的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

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