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

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.

The study of dynamic response model and energy optimization management process for the application of vanadium redox flow battery in microgrid

“…The DC/DC energy storage converter based on a phase-shifted full-bridge circuit used in the literature [9] is chosen in this paper.…”

Synergistic approach of high-performance N-NiCo/PC environment benign electrode material for energy storage device

“…The cost-effective transition metals (TM) or metal oxides having comparable specific energies among noble metals or metuloids and attaining great importance recently. In supercapacitor application the transition metals, nickel (Ni) [18], cobalt (Co) [19], ruthenium (Ru) [20], vanadium (V) [21], manganese (Mn) [22], etc. are widely used because of their high faradic charge transference process [23].…”

Design of a Novel Voltage Controller for Conversion of Carbon Dioxide into Clean Fuels Using the Integration of a Vanadium Redox Battery with Solar Energy

“…The value is an indication of the energy level of the VRB, which is related to the concentrations of the different vanadium species. Generally, the state of charge can be calculated as follows [18,19]:…”

“…The charging/discharge efficiency of the VRB is a function of load and SOC [17,19]. According The electrochemical models of the VRB are based on the conservation law of mass, species concentration, and energy.…”

“…The charging/discharge efficiency of the VRB is a function of load and SOC [17,19]. According to this simplified equivalent estimation of SOC under charging and discharging, the PV system including the VRB was modeled and the control parameters of the integration of the VRB with the PV system were reasonably designed to stabilize the fluctuations in power generation output [20][21][22].…”