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首页> 外文期刊>Journal of Energy Storage >Design and experimental validation of a generalised electrical equivalent model of Vanadium Redox Flow Battery for interfacing with renewable energy sources
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Design and experimental validation of a generalised electrical equivalent model of Vanadium Redox Flow Battery for interfacing with renewable energy sources

机译：与可再生能源对接的钒氧化还原液流电池广义等效模型的设计和实验验证

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摘要

In this paper a MATLAB/Simulink based generalised electrical equivalent model of Vanadium Redox Flow Battery (VRFB) has been proposed with an objective of interfacing VRFB with renewable energy sources. The impact of practical parameters like flow rate, self discharge, pump power loss and charge-discharge current profile has been considered for analysing VRFB performance. The model involves online estimation of VRFB stack terminal voltage and state of charge (SOC) under different constant current charge-discharge profiles. The accurate estimation of electrical characteristics of VRFB leads to a benchmark for selection of the design parameters of an efficient charge controller taking into account the variability of renewable energy sources. An optimal range of variable electrolyte flow rates for dynamic SOC has been estimated to design suitable flow rate controller. This ensures minimum VRFB system power consumption during charging and maximum power output during discharging which leads to maximum overall VRFB system efficiency. A generic MATLAB library has also been created for optimal design of any generalised VRFB system. A practical 20 Cell 1 kW 6 h VRFB system has been used for experimental validation of simulation results of the proposed model which shows a very good agreement having maximum error within 0.5% and 0.21% for VRFB cell terminal voltage estimation during charging and discharging respectively. The proposed model of the VRFB system is then applied for interfacing and investigating the performance of a 1 kW 6 h VRFB with a microgrid system comprising of 10 kW Solar PV, local loads and distribution grid.
机译：本文提出了一个基于MATLAB / Simulink的钒氧化还原液流电池（VRFB）的广义电当量模型，其目的是将VRFB与可再生能源连接。在分析VRFB性能时，已考虑了实际参数（例如流量，自放电，泵功率损耗和充放电电流曲线）的影响。该模型涉及在线估计不同恒流充放电曲线下的VRFB堆栈端子电压和充电状态（SOC）。考虑到可再生能源的可变性，VRFB的电气特性的准确估算可为选择高效充电控制器的设计参数提供基准。已估算出动态SOC的可变电解质流量的最佳范围，以设计合适的流量控制器。这样可确保在充电过程中VRFB系统的功耗最小，而在放电过程中则输出最大功率，从而最大程度地提高了VRFB系统的整体效率。还创建了通用的MATLAB库，用于优化任何通用VRFB系统的设计。实际的20电池1 kW 6 h VRFB系统已用于所提出模型的仿真结果的实验​​验证，该模型显示出很好的一致性，在充电和放电期间VRFB电池端子电压估算的最大误差分别在0.5％和0.21％之内。然后将拟议的VRFB系统模型应用于1 kW 6 h VRFB与包括10 kW太阳能PV，本地负载和配电网的微电网系统的接口和研究性能。

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