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Off-Grid Smoothing Control Strategy for Dual Active Bridge Energy Storage System Based on Voltage Droop Control

Author

Listed:
  • Chunhui Liu

    (State Grid Inner Mongolia Eastern Power Co., Ltd., Hohhot 010020, China)

  • Cai Xu

    (State Grid Inner Mongolia Eastern Power Co., Ltd., Hohhot 010020, China)

  • Yinfu Bao

    (State Grid Inner Mongolia Eastern Power Co., Ltd., Hohhot 010020, China)

  • Haoran Chen

    (State Grid Inner Mongolia Eastern Power Co., Ltd., Hohhot 010020, China)

  • Xiaolu Chen

    (State Grid Inner Mongolia Eastern Power Co., Ltd., Hohhot 010020, China)

  • Min Chen

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

  • Feng Jiang

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

  • Zhaopei Liang

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract

Energy storage systems based on dual active bridge (DAB) converters are a critical component of DC microgrid systems. To address power oscillations and system stability issues caused by power deficits during the off-grid operation of DC microgrids, a control strategy for DAB energy storage systems based on voltage droop control is proposed. By analyzing the internal operational mechanisms of DAB power electronic converters and integrating voltage droop equations, a small-signal model is constructed to deeply investigate the dynamic characteristics of DAB energy storage systems under off-grid conditions. Using the Nyquist stability criterion, appropriate voltage droop coefficients are selected to enhance system stability. Finally, a DC microgrid model is built on the MATLAB/Simulink simulation platform. Through the rational design of the droop coefficients, the overshoot of the power response is reduced from 28.87% to 4.27%, and settling time is effectively shortened while oscillations are suppressed. The simulation results validate the correctness and effectiveness of the theoretical framework proposed in this study.

Suggested Citation

  • Chunhui Liu & Cai Xu & Yinfu Bao & Haoran Chen & Xiaolu Chen & Min Chen & Feng Jiang & Zhaopei Liang, 2025. "Off-Grid Smoothing Control Strategy for Dual Active Bridge Energy Storage System Based on Voltage Droop Control," Energies, MDPI, vol. 18(7), pages 1-15, March.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:7:p:1585-:d:1617995
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