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1、第xx卷第xxx期电测与仪表Vol.xxNo.xxx20xx年第xx期ElectricalMeasurement&InstrumentationDec.xxxx并联微网逆变器输出功率精确分配研究*常振东，陶彩霞（兰州交通大学自动化与电气工程学院，兰州730070）摘要：为了解决基于传统下垂控制的并联微网逆变器输出功率分配不合理问题，以两逆变器并联运行模型为研究对象，详细分析下垂控制中并联逆变器输出功率分配机理，得出并联逆变器输出功率分配不精确的本质原因是逆变器总输出阻抗和额定容量间的不匹配。进而提出了一种改进下垂控制策略，在电压外环采用准比
2、例谐振（PR）控制，同时虚拟阻抗被引入到电流反馈环，进而使逆变器总输出阻抗近似于虚拟阻抗，通过比例设置虚拟阻抗实现并联逆变器输出功率的精确分配。此外，在功率控制环中引入逆变器输出电压幅值反馈环节，合理选定预设电压，有效改善了虚拟阻抗造成的输出电压降低问题。仿真软件验证了理论分析的正确性。关键词：功率分配；准比例谐振控制；虚拟阻抗；预设电压DOI：中图分类号：TM464文献标识码：A文章编号：Researchonaccurateoutputpowerdistributeddistributionofparallelmicro-gridinnv
3、erterChangZhendong,TaoCaixia(SchoolofAutomation&ElectricalEngineering,LanzhouJiaoTongUniversity,Lanzhou730070,China)Abstract：Inordertosolvetheproblemofunreasonableoutputpowerdistributionofparallelmicro-gridinvertersundertraditionaldroopcontrol,thispapertakesparalleloperati
4、onmodeloftwoinvertersastheresearchobject,theDetaileddetailedanalysisoftheoutputpowerdistributionmechanismofparallelinvertersindroopcontrolisconducted,andtheessentialreasonforinaccurateoutputpowerdistributionofparallelinvertersisthemismatchbetweenthetotaloutputimpedanceofth
5、einverterandtheratedcapacity.Therefore,animproveddroopcontrolstrategyisproposedtosolvethisproblem.Thequasi-proportionalresonance(PR)controlisappliedtotheoutervoltageloop,andthevirtualimpedanceisintroducedintothecurrentfeedbackloop,sothatthetotaloutputimpedanceoftheinverter
6、issimilartothevirtualimpedance,thusachievingaccuratedistributionofoutputpowerofparallelinvertersbysettingvirtualsettingvirtualimpedanceaccordingtocapacityratio.Inaddition,theinverteroutputvoltageamplitudefeedbackloopisintroducingintroducedtheinverteroutputvoltageamplitudef
7、eedbackloopintothepowercontrolloopandthepredeterminedvoltageisselectedproperlyselectingofthepredeterminedvoltage,whichcaneffectivelyimprovetheoutputvoltagereductioncausedbythevirtualimpedance.theThecorrectnessofthetheoreticalanalysisareisverifiedbysimulationsoftware.Keywor
8、ds：powerdistribution,quasiproportionresonantcontrol,virtualimpedance,presetvoltage-1-第xx卷
