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

Chunhui Liu, Cai Xu, Yinfu Bao, Haoran Chen, Xiaolu Chen, Min Chen, Feng Jiang and Zhaopei Liang ()
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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

Energies, 2025, vol. 18, issue 7, 1-15

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.

Keywords: DC microgrid; dual active bridge topology; droop control; small-signal model; power fluctuations; Nyquist stability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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