文档名：异构逆变器并联系统改进Gershgorin圆稳定性判据及其多维谐振特性分析
摘要：以新能源为主体的新型电力系统正逐步呈现出异构逆变器并联系统特征,即以跟网型与构网型两类逆变器共存的形式呈现.为了全面准确地分析异构逆变器并联系统的稳定性问题,充分计及逆变器间、逆变器与电网间的交互影响,该文建立多逆变器的交互导纳矩阵模型.同时,提出一种基于Gershgorin圆定理的多机稳定性判据,通过引入距离向量函数简化分析过程.然后,基于改进的稳定性判据提出一种参数灵敏度计算方法,并量化分析了系统关键作用因子对异构系统稳定性的影响程度.最后,通过时域仿真算例与实验,验证了理论分析的有效性和稳定性判据的有效性.
Abstract：Themodernpowersystemhasundergoneasignificanttransformationwiththehighpenetrationofnewenergysourcesandpowerelectronicequipment.Adistinctivefeatureofthepowersupplysystemdominatedbynewenergysourcesistheemergenceoftheheterogeneousinverterparalleledsystem(HIPS),characterizedbythecoexistenceofgrid-following(GFL)andgrid-forming(GFM)inverters.Comparedtoasingle-typemulti-inverterparalleledsystem,HIPSneedstoconsiderthedeviceinteractionsanduncertaintiesintroducedbydifferencesbetweeninverters.Thispaperfocusesonthemulti-dimensionalresonancecharacteristicsofHIPSandinvestigatestheeffectsofinteractionsbetweendifferentinvertertypesonsystemstabilitybyestablishingtheHIPSinteractionadmittancematrixmodel.SincetheGFLissynchronizedbyaphase-lockedloop(PLL)andtheGFMisself-synchronizedbyapower-synchronizedloop(PSL),theeffectsofPLL,PSL,anddelayarecomprehensivelyconsideredwhenestablishingtheHIPSinteractionadmittancematrix.Itenablesaccuratemodelingofdifferentinvertertypes.AnimprovedGershgorin-circlestabilitycriterion(GCSC)isproposed.TheintroductionofadistancevectorfunctionFsimplifiestheanalyzingprocess.AparametersensitivitycalculationmethodbasedonGCSCisproposed,andthestabilityeffectsofkeyactionfactorsonHIPSarequantitativelyanalyzed.Finally,theeffectivenessofthetheoreticalanalysisandstabilitycriterionisverifiedbytime-domainsimulationarithmeticandexperiments.IfthedistancevectorFislessthanzero,thesystemisjudgedunstable.Thismethodcandeterminesystemstabilityandvisuallyanalyzetheoscillationpointofthesystem.ComparedtotraditionalmethodssuchastheNyquistcriterionandmodalanalysismethod,theGCSCreducesalgorithmrunningtimeto26%andCPUusageto17%.Thefollowingconclusionscanbedrawn.(1)Thehigh-frequencyresonantinstabilityofthegrid-followinginverterparalleledsystem(GFLs)inaweakgridisprimarilycausedbytheinstabilityofthecurrentloopandPLLtriggeredbytheexcessivegridimpedance.ThecurrentloopbandwidthBCL-GFLhasanarrowadjustablerangewithinthestabilizationregion,whichisthemostimportantparameteraffectingthestabilityofGFLs.Moreover,thecouplingeffectwiththeLCLfilterbecomesstrongasthegridimpedanceincreases.(2)GFMsaresusceptibletolow-frequencyoscillatoryinstabilityinastronggrid,mainlycausedbysmallgridimpedancetriggeringPSLandvoltageloopinstability.ThevoltageloopbandwidthBVL-GFMisidentifiedasacrucialparameter.(3)HIPS,integratingGFLandGFMadvantages,exhibitscomplementarystabilitycharacteristics.Inweakgrids,theGFMprovidesvoltageandfrequencysupportfortheGFLtoweakenthecouplinginfluenceofgridimpedance.Instronggrids,theGFLaccessincreasesthegrid-sideequivalentinductivereactanceoftheGFM,reducingpowerfluctuationinfluence.Inaddition,thetime-domainsimulationandexperimentalresultsshowthattheresonancepointsoftheFFTanalysisofthegrid-connectedcurrentsareconsistentwiththestabilityanalysisresultsoftheGCSC.FocusingontheHIPSinteractionadmittancematrixmodelanditsstabilityanalysis,thispaperquantitativelyanalyzesthekeyactionfactors.Furtherresearchissuggestedtodelveintodiscrete-domainmodelingproblemsforcomplexhigh-orderHIPSconsideringpracticalengineeringaspects.
作者：林鸿彬 葛平娟 徐海亮 吴瀚 张伟杰Author：LinHongbin GePingjuan XuHailiang WuHan ZhangWeijie
作者单位：中国石油大学(华东)新能源学院青岛266580
刊名：电工技术学报
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(8)
分类号：TM464
关键词：构网型逆变器 跟网型逆变器 异构逆变器并联系统 Gershgorin圆定理 参数灵敏度分析
Keywords：Grid-forminginverter grid-followinginverter heterogeneousinverterparalleledsystem theGershgorin-circletheorem parametricsensitivityanalysis
机标分类号：TM711TP391.9TH137
在线出版日期：2024年4月29日
基金项目：国家自然科学基金，山东省自然科学基金资助项目异构逆变器并联系统改进Gershgorin圆稳定性判据及其多维谐振特性分析[
期刊论文] 电工技术学报--2024, 39(8)林鸿彬 葛平娟 徐海亮 吴瀚 张伟杰以新能源为主体的新型电力系统正逐步呈现出异构逆变器并联系统特征,即以跟网型与构网型两类逆变器共存的形式呈现.为了全面准确地分析异构逆变器并联系统的稳定性问题,充分计及逆变器间、逆变器与电网间的交互影响,该文...参考文献和引证文献
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异构逆变器并联系统改进Gershgorin圆稳定性判据及其多维谐振特性分析.pdf
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