Distributed secondary level control for energy storage management in DC microgrids
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Universidade Federal de Minas Gerais
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DC microgrids have been known to be a promising solution for improving renewable energy integration with electrical grid and enhancing the system's overall energy efficiency. A key component of this microgrid is the energy storage system, which besides smoothing the intermittent behavior of renewable sources, also allows intentional islanding and the execution of optimization routines to improve the microgrid performance. Assuming that storage systems in commercial and residential buildings will mostly be composed of multiple storage units, an energy storage management system, which provides charge/discharge monitoring and state-of-charge (SOC) equalization, is needed to prevent overcharging the units or their uneven use, which can lead to faster deterioration of battery banks. This paper proposes an energy storage management system based on distributed secondary level control, which promotes charge/discharge control and provides SOC equalization simultaneously. The SOC imbalance compensation alters the energy storage unit virtual droop resistance according to the difference between the unit SOC and the microgrid average SOC, thus the compensation intensity is dependent on the imbalance level being suitable to be employed in dc bus signaling controlled microgrids.
Abstract
Assunto
Engenharia elétrica, Geração de energia, Energia elétrica -- Distribuição
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DC microgrids, dc bus signaling, Microgrids , Voltage control , Batteries , Resistance , Storage management , Satellite broadcasting, Secondary Control , Dc Microgrid , Energy Storage Management , Secondary Level Control , Renewable Sources , Storage Systems , Power Grid , Energy Storage Systems , Commercial Buildings , Storage Units , Energy Storage Units , Original Design , Output Current , Voltage Difference , Inductor Current , Power Management , Bus Voltage , Terminal Voltage , Dc Bus Voltage , Charging Mode , Equivalent Source , Convergence Factor , Standalone Mode , Current Imbalance , Microgrid Operation , Discharge Mode , Compensation Algorithm , Voltage Sag , Battery Management System
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https://ieeexplore.ieee.org/document/7423808