Modeling of Lithium-ion Battery Packs for Energy Storage System Considering Inconsistency of Internal Battery Parameters

被引：0

作者：

Liu L. ^{[1
]}

Niu M. ^{[1
]}

Zheng W. ^{[1
]}

Hui D. ^{[1
]}

Li X. ^{[1
]}

机构：

[1] State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems (China Electric Power Research Institute), Beijing

来源：

Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2021年 / 45卷 / 19期

关键词：

Energy storage system; Lithium-ion battery; Series capacitor equivalent model; State of charge (SOC);

D O I：

10.7500/AEPS20210322002

中图分类号：

学科分类号：

摘要：

At present, the modelling of electrochemical energy storage systems generally follows the simple equivalent model based on one battery cell. The inconsistency of internal battery parameters is rarely considered in modelling of packs and systems, which results in large error in battery pack simulation under low state of charge (SOC) conditions, and the error becomes more obvious with the aging of the energy storage system. Based on the structure of the real battery packs in lithium-ion battery packs for energy storage station, this paper analyzes the factors that affect the voltage error of the simple equivalent model and the voltage characteristic connection between battery cells and battery packs, analyzes the causes of voltage differences between battery cells, proposes the series capacitor equivalent model, introduces SOC and capacity of battery cells into voltage correction as the main incentive parameters,and establishes a parallel model considering unbalanced current between battery strings.Simulation result shows that compared to the simplified equivalent model,the proposed model can improve simulation accuracy in low SOC, which provides technology support for battery system simulation models composed by series and parallel battery cells. © 2021 Automation of Electric Power Systems Press.

引用

页码：15 / 23

页数：8

共 27 条

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