Vol.43No.062023.06船电技术|应用研究1三级级联多母线直流系统稳定性分析及判据熊涛,杨创,李时铭,王超(武汉船用电力推进装置研究所,武汉430064)摘要:为了得到多级级联变换器系统稳定性判据,本文首先建立了多级级联DC-DC变换器的通用二端口小信号模型,并计算了其等效次回路增益,用于判断系统的稳定性。在此基础上,进一步推导了三级级联直流系统的稳定性条件,并与两个子系统进行了比较。得出结论是即使某些子系统不能单独稳定运行,但整个系统仍然可能是稳定。此外,根据推导出的稳定性条件,对现有的三级级联直流系统稳定性判据进行了统一解释,并提出了一种母线等效阻抗判据。关键词:DC-DC变换器等效次回路增益稳定性三级级联直流系统中图分类号:TM612文献标识码:A文章编号:1003-4862(2023)06-0001-06Stabilityanalysisandcriterionoftriple-stagecascademultibusDCsystemXiongTao,YangChuang,LiShiming,WangChao(WuhanInstituteofMarineElectricPropulsion,Wuhan430064,China)Abstract:inordertoobtainthestabilitycriterionofmultistagecascadedconvertersystems,Firstly,thegenerictwo-portsmall-signalmodelofthemulti-stagecascadedDC-DCconvertersisestablishedanditsequivalentminorloopgainiscalculated,whichcanbeusedtoassesssystemstability.Onthisbasis,thestabilityconditionofthetriple-stagecascadedDCsystemisfurtherdeducedandcomparedwithitstwosubsystems.Theconclusionisthatthewholesystemmaybestableevenifsomeofitssubsystemscannotoperatestablyindividually.Besides,accordingtothededucedstabilitycondition,someexistingstabilitycriteriaofthetriple-stagecascadedDCsystemareexplaineduniformlyandabusequivalentimpedancecriterion(BEIC)isproposed.Finally,thecasestudyandexperimentsarecarriedouttoverifythecorrectnessoftheoreticalanalysis.Keywords:busequivalentimpedancecriterion;equivalentminorloopgain;stability,triple-stagecascadedDCsystem0引言近年来,随着可再生能源技术的逐渐成熟,在能源行业,直流微电网技术[1]得到了广泛关注和蓬勃发展,越来越多的被应用于通信系统、数据中心、汽车制造、航天航空、船舶制造及铁路牵引等工业领域。尽管直流微电网技术有许多优点,但确保其系统的稳定性仍然具有不小的挑战。为了满足电能质量和电压幅值的要求,直流收稿日期:2022-06...