Design and experimental validation of a generalised electrical equivalent model of Vanadium Redox Flow Battery for interfacing with renewable energy sources
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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DOI：
10.1016/j.est.2017.07.016
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发表时间：
2017-10-01
影响因子：
9.4
通讯作者：
Saha, Hiranmay
中科院分区：
文献类型：
--
作者：
Bhattacharjee, Ankur;Saha, Hiranmay
在本文中，基于MATLAB/Simulink的通用电气等效模型的钒氧化还原液流电池（VRFB）已被提出的目标VRFB与可再生能源的接口。实际参数的影响，如流量，自放电，泵的功率损耗和充电-放电电流剖面已被认为是分析VRFB的性能。该模型包括在线估计不同恒流充放电曲线下的VRFB电堆端电压和荷电状态（SOC）。VRFB的电气特性的准确估计导致一个基准选择的设计参数的一个有效的充电控制器考虑到可再生能源的变化。为设计合适的流量控制器，估计了动态SOC的最佳可变电解质流量范围。这确保了充电期间的最小VRFB系统功耗和放电期间的最大功率输出，从而实现最大的VRFB系统整体效率。一个通用的MATLAB库也被创建为任何广义VRFB系统的优化设计。一个实际的20电池1千瓦6小时的VRFB系统已被用于实验验证所提出的模型的仿真结果显示出非常好的协议，最大误差为0.5%和0.21%的VRFB电池端电压估计在充电和放电期间分别。建议的模型的VRFB系统，然后应用于接口和1千瓦6小时VRFB与微电网系统，包括10千瓦的太阳能光伏，本地负载和配电网的性能调查。(C)2017爱思唯尔有限公司版权所有。
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. (C) 2017 Elsevier Ltd. All rights reserved.