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A two-stage bidirectional DC-DC converter system and its control strategy

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  • Liu, Xiaobo
  • Wu, Xiaohua

Abstract

With the development of more-electric aircrafts, bidirectional DC-DC converter has been widely used in this field. In order to improve the voltage regulation range and stability of the bidirectional DC-DC converter system, a two-stage bidirectional DC-DC converter with some operation modes is used and analyzed in this paper. The converter is composed of a four-switch buck-boost circuit and an isolated CLLC resonant circuit, where all MOSFETs can realize soft switching action. The four-switch buck-boost circuit regulates the output voltage in a certain range through the duty cycle control, and the CLLC resonant circuit can control the output voltage by changing its switching frequency, where the two-stage bidirectional DC-DC converter adopts voltage closed-loop control strategy to realize the stable voltage output. Due to the existence of the intermediate part conversion voltage, the converter has three-port network characteristics, which makes it applicable to the working occasions with multiple voltage levels. The feasibility of this two-stage bidirectional DC-DC converter system combined with control strategy and its three-port operation used for more-electric aircraft power system are verified by simulation analysis.

Suggested Citation

  • Liu, Xiaobo & Wu, Xiaohua, 2023. "A two-stage bidirectional DC-DC converter system and its control strategy," Energy, Elsevier, vol. 266(C).
    • Handle: RePEc:eee:energy:v:266:y:2023:i:c:s0360544222033485
    DOI: 10.1016/j.energy.2022.126462
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    References listed on IDEAS

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    1. Abdelmalek, Samir & Dali, Ali & Bakdi, Azzeddine & Bettayeb, Maamar, 2020. "Design and experimental implementation of a new robust observer-based nonlinear controller for DC-DC buck converters," Energy, Elsevier, vol. 213(C).
    2. Duan, Hao & Zhang, Caizhi & Wang, Gucheng & Chen, Yu'an & Liu, Zhixiang & Xie, Xianshu & Shuai, Qi, 2022. "Experimental study of the dynamic and transient characteristics of sub-health fuel cell multi-stack systems without DC/DC," Energy, Elsevier, vol. 238(PC).
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    Cited by:

    1. Saad Khan Baloch & Abdul Sattar Larik & Mukhtiar Ahmed Mahar, 2023. "Analyzing the Effectiveness of Single Active Bridge DC-DC Converter under Transient and Load Variation," Sustainability, MDPI, vol. 15(6), pages 1-18, March.
    2. Fang, Shuo & Song, Nan & Liu, Yuntao & Zhou, Chaoyang & Zhao, Chunhui & Wang, Yun, 2023. "Oscillator design for high efficiency DC-DC of micro direct methanol fuel cell," Energy, Elsevier, vol. 284(C).

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