全球能源互联网2025，Vol.8Issue(6)：762-773,12.DOI:10.19705/j.cnki.issn2096-5125.20240157
储能型虚拟直流发电机非等容锂电池健康状态均衡策略
State of Health Balancing Scheme for Non-equal Capacity Lithium Batteries in Energy Storage Virtual DC Generator
摘要
Abstract
When the traditional virtual DC generator(VDCG)control strategy is used in the DC/DC converter of lithium-ion batteries in a DC microgrid,the state of health(SOH)of the lithium-ion battery cannot be balanced,which increases the maintenance cost of the lithium-ion battery.Existing schemes based on VDCG control can only achieve state of charge(SOC)parameter balancing of lithium batteries.Therefore,this paper proposes a SOH balancing strategy for non-equal capacity lithium battery packs based on VDCG.First,combining VDCG and SOH estimation formula,the principle of VDCG regulating SOH is analyzed.Secondly,the adjustment coefficient is redesigned according to the influence of capacity difference on SOH balancing.Then,the depth of discharge(DOD)of the lithium battery is combined with the VDCG output active power as an equilibrium variable,and the SOH balancing is achieved by adjusting the active power.Thirdly,a small signal model based on VDCG control scheme is established,and the control parameters to ensure system stability is selected through root trajectory.Finally,the simulation waveforms obtained by MATLAB simulation software validated the effectiveness of the proposed scheme.关键词
直流微电网/健康状态/虚拟直流发电机/放电深度/主动均衡Key words
DC microgrid/state of health(SOH)/virtual dc generator(VDCG)/depth of discharge(DOD)/active balancing分类
信息技术与安全科学引用本文复制引用
吴青峰,王毅,刘立群,朱彦军,樊亚敏,薄利明..储能型虚拟直流发电机非等容锂电池健康状态均衡策略[J].全球能源互联网,2025,8(6):762-773,12.基金项目
山西省基础研究计划面上项目(202203021221153).Shanxi Province Basic Research Program General Project(202203021221153). （202203021221153）
