钒液流电池的综合建模研究

Synthetical modeling and analysis of vanadium redox flow battery

本文以全钒液流电池(VRB)的等效电路模型为基础,包括电堆电动势、过电势和欧姆极化,结合分析离子扩散、电解液流动损耗和温度变化的动态模型,在Simulink中建立了VRB的动态等效电路仿真模型。将实验测量的参数代入所建立的模型中,对比了恒流以及恒功率充放电的实验与仿真曲线,经定量分析可知所建立模型的误差小于1%。最后结合仿真数据分析了VRB的电荷效率和能量效率,结果表明充放电循环电流/功率越大,其电荷效率越高,但能量效率随之降低。

This paper proposed a dynamic equivalent circuit simulation model of all vanadium liquid flow battery(VRB) in Simulink. The model is built based on the equivalent circuit model of VRB, including the electromotive force, overpotential and ohmic polarization of the reactor, and the dynamic model analysis of effects of ion diffusion, electrolyte flow loss and temperature change. By substituting experimental parameters into the model,the experimental and simulation curves of constant current/power charge-discharge are compared.Quantitative analysis shows that the error of the model is less than 1%.Finally, the charge efficiency and energy efficiency of VRB are analyzed with simulation data. The results show that if the cyclic current/ power increase,the charge efficiency will increase as well, while voltage efficiency will decrease.