Keywords
droop control；DC microgrid；energy storage unit；dynamic speed regulation factor
Abstract
As an important part of DC microgrid system, the energy storage unit is related to reasonable powerdistribution and continuous stability of bus voltage during charge and discharge process. However, for DC microgrid systems containing multiple distributed energy storage, the imbalance of SOC will inevitably reduce the availability of energy storage systems.In order to ensure the normal and stable operation of the system and realize the fast equalization control of the SOC of the energy storage unit under different working conditions, an improved droop control strategy is proposed by introducing line impedance compensation feedforward link and dynamic speed regulation factor to eliminate the impact of inconsistent initial states of the distributed energy storage units and different line impedance. After that, Matlab/Simulink was used to build a simulation platform experiment to verify the feasibility and effectiveness of the proposed control strategy under different charging and discharging conditions. Finally, it was concluded that compared with the original control strategy, the dynamic speed regulating factor control strategy proposed in this paper can effectively accelerate the energystorage balancing speed under various working conditions, and maintain the normal and stable operation of the microgrid system.
DOI
10.19781/j.issn.1673-9140.2023.04.006
First Page
57
Last Page
64
Recommended Citation
MING, Yuanshan; HU, Huihui; LIU, Kaixuan; HE, Xinxia; and DONG, Lei
(2023)
"Research on SOC balance control strategy of energy storage unit in DC microgrid in island mode,"
Journal of Electric Power Science and Technology: Vol. 38:
Iss.
4, Article 6.
DOI: 10.19781/j.issn.1673-9140.2023.04.006
Available at:
https://jepst.researchcommons.org/journal/vol38/iss4/6