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Batteries 2019, 5(1), 20; https://doi.org/10.3390/batteries5010020

Optimal Charging of Vanadium Redox Flow Battery with Time-Varying Input Power

1
School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
2
School of Electrical Eng. and Telecom., The University of New South Wales, Sydney, NSW 2052, Australia
*
Author to whom correspondence should be addressed.
Received: 14 November 2018 / Revised: 19 January 2019 / Accepted: 31 January 2019 / Published: 10 February 2019
(This article belongs to the Special Issue Vanadium Redox Flow Battery and Its Applications)
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Abstract

The battery energy storage system has become an indispensable part of the current electricity network due to the vast integration of renewable energy sources (RESs). This paper proposes an optimal charging method of a vanadium redox flow battery (VRB)-based energy storage system, which ensures the maximum harvesting of the free energy from RESs by maintaining safe operations of the battery. The VRB has a deep discharging capability, long cycle life, and high energy efficiency with no issues of cell-balancing, which make it suitable for large-scale energy storage systems. The proposed approach determines the appropriate charging current and the optimal electrolyte flow rate based on the available time-varying input power. Moreover, the charging current is bounded by the limiting current, which prevents the gassing side-reactions and protects the VRB from overcharging. The proposed optimal charging method is investigated by simulation studies using MATLAB/Simulink. View Full-Text
Keywords: vanadium redox flow battery (VRB); energy storage system; optimal charging control; limiting current; electrolyte flow rate vanadium redox flow battery (VRB); energy storage system; optimal charging control; limiting current; electrolyte flow rate
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Akter, M.P.; Li, Y.; Bao, J.; Skyllas-Kazacos, M.; Rahman, M.F. Optimal Charging of Vanadium Redox Flow Battery with Time-Varying Input Power. Batteries 2019, 5, 20.

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