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An Energy Management Strategy for DC Microgrids with PV/Battery Systems

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Abstract

Recently, direct current (DC) microgrids have gained more attention over alternating current (AC) microgrids due to the increasing use of DC power sources, energy storage systems and DC loads. However, efficient management of these microgrids and their seamless integration within smart and energy efficient buildings are required. This paper introduces an energy management strategy for a DC microgrid, which is composed of a photovoltaic module as the main source, an energy storage system (battery) and a critical DC load. The designed MG includes a DC-DC boost converter to allow the PV module to operate in MPPT (Maximum Power Point Tracking) mode or in LPM (Limited Power Mode). Furthermore, the system uses a DC-DC bidirectional converter in order to interface the battery with the DC bus. The proposed control strategy manages the power flow among different components of the microgrid. It takes the battery lifetime into consideration by applying constraints to its charging/discharging currents and state-of-charge (SoC). The proposed system is simple and efficient in supplying DC loads, since as it’s not using complex algorithms either for MPPT or for energy management. The studied DC microgrid is designed and modeled using Matlab/Simulink software. The load demand is satisfied while ensuring good performance and stability of the system. The controller design, analysis, and simulation validation results are presented and discussed under various operating modes.

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Acknowledgments

This work was supported by the International University of Rabat, LERMA-M2E-MG-Project (2020 -2022). It is also partially supported by HOLSYS project, which is funded by IRESEN (2020-2022).

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Correspondence to Youssef Alidrissi.

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Alidrissi, Y., Ouladsine, R., Elmouatamid, A. et al. An Energy Management Strategy for DC Microgrids with PV/Battery Systems. J. Electr. Eng. Technol. 16, 1285–1296 (2021). https://doi.org/10.1007/s42835-021-00675-y

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