Research progress on modeling and SOC online estimation of vanadium redox-flow batteries
The vanadium redox-flow battery(VRFB)offers the advantages of high security and long life,and has broad application prospects in the field of large-scale energy storage.High-precision battery models and accurate battery state-of-charge(SOC)estimation are important technical foundations for the practical application of VRFBs,and the main challenge that must be overcome for their large-scale application.This paper reviews the simulation model of VRFBs,the identification of model parameters,SOC monitoring with online estimation,and the factors specific to VRFB that affect SOC estimation.Two types of simulation models,an electrochemical model and an equivalent-circuit model,are introduced.The principles,advantages,and disadvantages of several equivalent-circuit models for VRFBs are analyzed and compared.This paper focuses on methods to monitor the SOC of VRFBs,including the ampere-time integration method,open-circuit voltage method,potential titration method,conductivity method,optical analysis method,and SOC online estimation method that are promising for engineering applications.The paper summarizes the techniques of offline and online identification of the model parameters of VRFBs and introduces the SOC online estimation method,which is based on the filtering and data-driven algorithms.To understand the specific factors that affect SOC estimation of VRFB,we focus on the transmembrane migration of vanadium ions,the negative electrode oxidation side reaction,the negative electrode hydrogen precipitation reaction,and temperature on parameter identification and SOC estimation.Finally,this paper summarizes the outlook for this technology and proposes possible research directions for modeling and SOC online estimation of VRFBs.
vanadium redox-flow batterysimulation modelmodel parameter identificationstate of chargeonline estimation
万方数据
维普
