| Fundamental-wave optimal control strategy of circulation of DAB DC-DC converter based on unified model of phase shift control |
| 投稿时间：2023-03-25 修订日期：2023-08-18 |
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| English Abstract: |
| For making full use of the capacity of dual active bridge(DAB) DC-DC converters, reducing reactive power and improving working efficiency, a fundamental-wave optimal control strategy of circulation based on the unified model of phase shift control for the converter is proposed. All phase shift control modes of the converter are described uniformly by introducing fundamental phase shift ratio, and the unified model of AC voltage of full bridges and inductance current is established by using Fourier decomposition. The unified model reduces the complexity of multi-mode analysis of converters under multivariate control, and is suitable for all operating modes under different phase shift control with the universality. Based on frequency domain analysis and power factor angle, a unified mathematical model of converter transmission power and reactive power is built. On this basis, an optimal control strategy considering the fundamental-wave component of reactive power is proposed, and the conduction loss is modeled and analyzed. This strategy is simple and effective to reduce reactive power of the converter and improve system efficiency commen-dably, which is more conducive to the practical application of the project. An experimental platform is built to compare the power factor and conversion efficiency of the converter under the proposed fundamental-wave optimal control strategy and the conventional phase shift control modes. The simulative and experimental results verify the correctness of the theoretical analysis and the feasibility of the proposed control strategy. |
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| English and key words:dual active bridge DC-DC converters unified model fundamental-wave optimization power factor transmission efficiency |
| 基金项目:国家自然科学基金资助项目(52377185)；湖南省自然科学基金资助项目(2021JJ50059)；湖南省教育厅科学研究项目(22C0322) |
| DOI：10.16081/j.epae.202312008 |
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