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Sustainability 2017, 9(3), 441; doi:10.3390/su9030441

Design of a Bidirectional Energy Storage System for a Vanadium Redox Flow Battery in a Microgrid with SOC Estimation

School of Electrical Engineering, Wuhan University, Wuhan 430072, China
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Author to whom correspondence should be addressed.
Academic Editor: Tomonobu Senjyu
Received: 1 December 2016 / Revised: 10 March 2017 / Accepted: 14 March 2017 / Published: 17 March 2017
(This article belongs to the Section Energy Sustainability)
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Abstract

This paper used a Vanadium Redox flow Battery (VRB) as the storage battery and designed a two-stage topology of a VRB energy storage system in which a phase-shifted full bridge dc-dc converter and three-phase inverter were used, considering the low terminal voltage of the VRB. Following this, a model of the VRB was simplified, according to the operational characteristics of the VRB in this designed topology of a VRB energy storage system (ESS). By using the simplified equivalent model of the VRB, the control parameters of the ESS were designed. For effectively estimating the state of charge (SOC) of the VRB, a traditional method for providing the SOC estimation was simplified, and a simple and effective SOC estimation method was proposed in this paper. Finally, to illustrate the proper design of the VRB ESS and the proposed SOC estimation method, a corresponding simulation was designed by Simulink. The test results have demonstrated that this proposed SOC estimation method is feasible and effective for indicating the SOC of a VRB and the proper design of this VRB ESS is very reasonable for VRB applications. View Full-Text
Keywords: vanadium redox flow battery; energy storage system; SOC estimation; simplified equivalent model; parameter design vanadium redox flow battery; energy storage system; SOC estimation; simplified equivalent model; parameter design
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Gong, Q.; Lei, J. Design of a Bidirectional Energy Storage System for a Vanadium Redox Flow Battery in a Microgrid with SOC Estimation. Sustainability 2017, 9, 441.

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