Research on Adaptive Droop Control Strategy for a Solar-Storage DC Microgrid

Zhanpeng Xu, Fuxin Chen, Kewei Chen and Qinfen Lu ()
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Zhanpeng Xu: Power China Huadong Engineering Co., Ltd., Hangzhou 311122, China
Fuxin Chen: Power China Huadong Engineering Co., Ltd., Hangzhou 311122, China
Kewei Chen: College of Electrical Engineering, Zhejiang University, Hangzhou 310058, China
Qinfen Lu: College of Electrical Engineering, Zhejiang University, Hangzhou 310058, China

Energies, 2024, vol. 17, issue 6, 1-13

Abstract: When the solar-storage DC microgrid operates in islanded mode, the battery needs to stabilize the bus voltage and keep the state of charge (SOC) balanced in order to extend the service life of the battery and the islanded operation time. When there are multiple energy storage units in the DC microgrid, it is necessary to solve the problem of unbalanced circulation and the state of charge between batteries using a reasonable droop control method. In this paper, firstly, the DC–DC charging and discharging circuit of the battery is designed, and the unbalanced SOC of the battery caused by the different impedances of the line is analyzed. Secondly, an adaptive droop control method is proposed to solve the problems of SOC imbalance and current circulation between the batteries. Thirdly, based on MATLAB/SIMULINK R2021b simulation software, the proposed control method is modeled and simulated. Compared with the traditional droop control, the effectiveness of the proposed method is validated.

Keywords: solar-storage DC microgrid; storage unit; islanded operation mode; droop control; state of charge (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: 2024
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