Hierarchical Control Strategy for Distributed Energy Storage Units in isolated DC Microgrid

The hierarchical control strategy of distributed energy storage units (DESUs) with mismatched line impedance and energy storage capacity is proposed for isolated DC microgrid. Firstly, the virtual impedance is dynamically adjusted by balance control to eliminate the influence of mismatched line impe...

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Bibliographic Details
Published in2019 Chinese Control Conference (CCC) pp. 7410 - 7415
Main Authors Yunhao, Han, Xin, Chen, Erde, Wang, Jianfeng, Che, Tingting, Hu, Yang, Mi
Format Conference Proceeding
LanguageEnglish
Published Technical Committee on Control Theory, Chinese Association of Automation 01.07.2019
Subjects
DC microgrid
droop control
Energy storage
energy storage balance
hierarchical control
Impedance
Microgrids
Photovoltaic systems
Resistance
state of charge (SoC)
Voltage control
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Summary:The hierarchical control strategy of distributed energy storage units (DESUs) with mismatched line impedance and energy storage capacity is proposed for isolated DC microgrid. Firstly, the virtual impedance is dynamically adjusted by balance control to eliminate the influence of mismatched line impedance for the accuracy of current sharing. Then, each distributed energy storage unit can adjust current through SoC balance control according to its capacity and state of charge (SoC), make the error of SoC decrease, and gradually realize the SoC balance of DESUs during charging and discharging process. Finally, three simulation schemes based on Matlab are normal charging and discharging of DESUs, fluctuation of photovoltaic power and load change in DC microgrid. The results show that the proposed method can make current allocate reasonably according to capacity of DESUs.
ISSN:2161-2927
DOI:10.23919/ChiCC.2019.8866269