Li, Boxi, Huang, Tao, Kong, Zhengmin, Chen, Lei, Yang, Jiajia, and Sun, Shikuan (2024) Discrete control for state of charge balance in DC microgrids considering the disturbance of photovoltaics. International Journal of Electrical Power and Energy Systems, 157. 109879.

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Abstract

This study examines State of Charge (SoC) balancing control in DC microgrids subject to photovoltaic (PV) fluctuations, aiming to optimize power distribution in energy storage systems influenced by PV disturbances. The proposed approach enhances both the lifespan of storage systems and microgrid stability. To mitigate voltage variation due to PV perturbation, the paper introduces an adjustment in droop control offset. Additionally, it presents a novel discrete Sliding Mode Controller (SMC) characterized by reduced parameter sensitivity, thus enhancing control responsiveness. A SoC balancing control strategy employing sliding mode control is developed to equalize SoC levels across Battery Energy Storage Systems during both charge and discharge cycles. The stability of this strategy is substantiated through the construction of a Lyapunov function. Simulations conducted in a distributed DC microgrid environment using Simulink/SimPower Systems demonstrate the efficacy of the discrete SMC and the SoC balancing algorithm, achieving uniform SoC in energy storage nodes during operation, with improved robustness against PV perturbations.

Item ID:	82450
Item Type:	Article (Research - C1)
ISSN:	1879-3517
Keywords:	Discrete sliding mode controller, Distributed DC microgrids, Battery energy storage system, Nonlinear system, State of charge balancing, Lyapunov stability
Copyright Information:	© 2024 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/).
Date Deposited:	26 Mar 2024 01:44
FoR Codes:	40 ENGINEERING > 4008 Electrical engineering > 400805 Electrical energy transmission, networks and systems @ 100%
SEO Codes:	17 ENERGY > 1703 Energy storage, distribution and supply > 170309 Smart grids @ 100%
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