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1、第xx卷第xxx期電測(cè)與儀表Vol.xxNo.xxx20xx年第xx期ElectricalMeasurement&InstrumentationDec.xxxx并聯(lián)微網(wǎng)逆變器輸出功率精確分配研究*常振東,陶彩霞(蘭州交通大學(xué)自動(dòng)化與電氣工程學(xué)院,蘭州730070)摘要:為了解決基于傳統(tǒng)下垂控制的并聯(lián)微網(wǎng)逆變器輸出功率分配不合理問(wèn)題,以兩逆變器并聯(lián)運(yùn)行模型為研究對(duì)象,詳細(xì)分析下垂控制中并聯(lián)逆變器輸出功率分配機(jī)理,得出并聯(lián)逆變器輸出功率分配不精確的本質(zhì)原因是逆變器總輸出阻抗和額定容量間的不匹配。進(jìn)而提出了一種改進(jìn)下垂控制策略,在電壓外環(huán)采用準(zhǔn)比
2、例諧振(PR)控制,同時(shí)虛擬阻抗被引入到電流反饋環(huán),進(jìn)而使逆變器總輸出阻抗近似于虛擬阻抗,通過(guò)比例設(shè)置虛擬阻抗實(shí)現(xiàn)并聯(lián)逆變器輸出功率的精確分配。此外,在功率控制環(huán)中引入逆變器輸出電壓幅值反饋環(huán)節(jié),合理選定預(yù)設(shè)電壓,有效改善了虛擬阻抗造成的輸出電壓降低問(wèn)題。仿真軟件驗(yàn)證了理論分析的正確性。關(guān)鍵詞:功率分配;準(zhǔn)比例諧振控制;虛擬阻抗;預(yù)設(shè)電壓DOI:中圖分類號(hào):TM464文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):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