NDLI: Control strategy to improve load/power sharing, DC bus voltage restoration, and batteries SOC balancing in a DC microgrid

Content Provider	IET Digital Library
Author	Eydi, Mohammad Ghazi, Reza
Abstract	DC microgrids are well known as a proper solution to link different DC sources, such as photovoltaic panels and wind turbines, directly to DC loads. Along with their advantages, they suffer from an imbalance state of charge (SOC) in their energy storage units (ESUs), improper current-sharing between ESUs, and DC bus voltage deviation. This study proposes a novel control strategy for DC microgrids, which not only balances ESUs SOC and shares current between ESUs proportional to their capacity but also, reduces DC bus voltage deviation significantly. In this way, the same droop curve is defined. Then, three virtual resistances are considered. The first one is set based on the lines resistance and ESUs capacity to share current among the ESUs properly. As the lines resistance changes affect the proportional current-sharing, the second virtual resistance is intended to relieve this effect. The third one is suggested to balance the ESUs SOC. The small-signal stability analysis is performed, which demonstrates that the proposed method has stability in all operating conditions. Simulation results in MATLAB/Simulink confirm that with the aid of the proposed control method, not only proper current-sharing and ESUs SOC balancing are obtained, but also DC bus voltage deviation is effectively diminished.
Starting Page	2668
Ending Page	2679
Page Count	12
ISSN	17521416
Volume Number	14
e-ISSN	17521424
Issue Number	Issue 14, Oct (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/14/14
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2020.0239
Journal	IET Renewable Power Generation
Publisher Date	2020-07-21
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Batteries SOC Balancing Control of Electric Power System DC Bus Voltage Deviation DC Bus Voltage Restoration DC Loads DC Microgrid Different DC Sources Distributed Power Generation Energy Storage ESUs Capacity ESUs Proportional ESUs SOC Balancing Improper Current-sharing Power Converter Power Generation Control Power Supplies to Apparatus Power Supply Quality Power System Control Power System Stability Proper Current-sharing Proportional Current-sharing Virtual Resistance Voltage Control Wind Power Plant Wind Turbine
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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