电力系统自动化2024，Vol.48Issue(2)：159-166,8.DOI:10.7500/AEPS20230506006
适用于直流链式储能的电池簇荷电状态自均衡控制策略
Self-equalizing Control Strategy for State of Charge of Battery Cluster in DC Cascaded H-Bridge Converter-Battery Energy Storage System
摘要
Abstract
Battery energy storage system(BESS)has become a key component of the power grid due to its advantages of improving the accommodation capacity of renewable energy.However,the inconsistency of batteries caused by production and usage processes is a critical factor affecting the capacity and lifespan of energy storage systems.Based on the topology of high-voltage DC cascaded H-bridge converter-battery energy storage system(CHBC-BESS),a hierarchical control strategy is adopted.Based on the first-level control for a voltage mode and a power mode,a state of charge(SOC)self-equalizing control strategy with adaptive control parameters is proposed to solve the problem of battery SOC unequalizing.The strategy considers the battery SOC deviation,the voltage levels of each module capacitor,the margin in DC system voltage control,and the upper and lower limits of the output modulation ratio.The equalizing coefficient is calculated in real time.Experimental results verify that the proposed strategy can achieve fast self-equalizing and high equalizing efficiency under the working conditions of large SOC deviation and the extreme working conditions of full-power charge-discharge switching.关键词
链式变换器/变流器/电池储能系统/荷电状态/均衡Key words
cascaded H-bridge converter/converter/battery energy storage system/state of charge/equalizing引用本文复制引用
张文昕,赵志勇,于华龙,王继慷,赵志芳,韩峰..适用于直流链式储能的电池簇荷电状态自均衡控制策略[J].电力系统自动化,2024,48(2):159-166,8.基金项目
国家重点研发计划资助项目(2020YFB1506800) （2020YFB1506800）
国家电网有限公司科技项目(52110421005H). This work is supported by National Key R&D Program of China(No.2020YFB1506800)and State Grid Corporation of China(No.52110421005H) （52110421005H）
