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Fixed-Time Backstepping Sliding-Mode Control for Interleaved Boost Converter in DC Microgrids

Author

Listed:
  • Hang Wang

    (College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China)

  • Yanfei Dong

    (School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China)

  • Guofeng He

    (School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China)

  • Wenbin Song

    (College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China)

Abstract

Interleaved boost converters (IBCs) are commonly used as interface converters for DC microgrids (MGs) due to their high efficiency and low output ripple. However, the MGs system can easily become unstable due to the negative impedance characteristics of constant power load (CPL) and rapid power fluctuations. This paper proposes a fixed-time backstepping sliding-mode controller (FTBSMC) aimed at stabilizing the MGs system and achieving fixed-time tracking of the DC bus voltage. Firstly, the fixed-time disturbance observer (FxTDO) estimates the load disturbance at a fixed time, which improves the fast disturbance resistance of the system. Then, based on the dis-turbance estimation, the FTBSMC is designed, which combines the fast dynamic response of the sliding-mode control with the global stability of the backstepping control, avoiding the singularity problem of the conventional sliding-mode control. In addition, a first-order nonlinear filter is employed to avoid the direct differentiation of conventional backstepping control and at the same time to ensure global fixed-time stability. The fixed-time convergence of the proposed FTBSMC is rigorously demonstrated by using Lyapunov stability analysis. Finally, the FTBSMC proposed is verified by simulation and experiment in terms of faster dynamic response and stronger robustness.

Suggested Citation

  • Hang Wang & Yanfei Dong & Guofeng He & Wenbin Song, 2024. "Fixed-Time Backstepping Sliding-Mode Control for Interleaved Boost Converter in DC Microgrids," Energies, MDPI, vol. 17(21), pages 1-20, October.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:21:p:5377-:d:1509266
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    References listed on IDEAS

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    1. Zongyu Zuo & Lin Tie, 2016. "Distributed robust finite-time nonlinear consensus protocols for multi-agent systems," International Journal of Systems Science, Taylor & Francis Journals, vol. 47(6), pages 1366-1375, April.
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