資源描述:
《新型的無(wú)隔離變壓器單相光伏并網(wǎng)逆變器.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在應(yīng)用文檔-天天文庫(kù)。
1、第37卷第10期電網(wǎng)技術(shù)Vol.37No.102013年10月PowerSystemTechnologyOct.2013文章編號(hào):1000-3673(2013)10-2712-07中圖分類(lèi)號(hào):TM721文獻(xiàn)標(biāo)志碼:A學(xué)科代碼:470·4051新型的無(wú)隔離變壓器單相光伏并網(wǎng)逆變器吳學(xué)智,尹靖元,楊捷,童亦斌(北京交通大學(xué)電氣工程學(xué)院,北京市海淀區(qū)100044)ANovelSingle-PhaseGrid-ConnectedPhotovoltaicInverterWithoutIsolationTransformerWUXuezhi,
2、YINJingyuan,YANGJie,TONGYibin(SchoolofElectricalEngineering,BeijingJiaotongUniversity,HaidianDistrict,Beijing100044,China)ABSTRACT:Thetopologyofanovelsingle-phasetwo-stage電池板的面積、結(jié)構(gòu)、環(huán)境及其安裝方式等因素影grid-connectedPhotovoltaic(PV)inverterwithoutisolation響,光伏池板陣列對(duì)大地存在約為50~200
3、nF/kWptransformerisproposed.ThedirectconnectionofPVpanels[2]的分布電容。光伏池板陣列與大地間分布電容的withthezerolineofpowergridcaneliminatethecommon存在,使得光伏并網(wǎng)逆變器引起的共模電壓通過(guò)分modevoltageofPVpaneltotheground,sotheproblemof[3-4]commonmodeleakagecurrentissolved.Intheproposed布電容形成共模電流,引起電網(wǎng)電流畸變、電磁
4、topologythehigh-frequencyvoltage-doublingmodeisutilized干擾等問(wèn)題[5],甚至還可能危及人身安全[6]。fortheconnectionofboostconverterwithgrid-connected可采用光伏池板陣列與電網(wǎng)間增加工頻或高invertertoavoidthesecondarypulsationofneutralpoint頻隔離變壓器抑制共模電流,但變壓器的存在會(huì)導(dǎo)potentialexistinginthree-levelgrid-connectedinve
5、rter,thus致光伏發(fā)電系統(tǒng)成本增加、效率降低,因此無(wú)工頻thedemandonthecapacityoffiltercapacitoratDCsideis[7-8]reduced.Toimplementtheastaticcontrolofsingle-phase隔離變壓器的光伏并網(wǎng)逆變器引起廣泛的關(guān)注。grid-connectedcurrent,theproportional-resonant(PR)目前單相無(wú)變壓器結(jié)構(gòu)的拓?fù)浒ń涣髋月吠負(fù)鋍ontrollerisadoptedinthegrid-connectionco
6、ntroltoenhance拓?fù)洌琀5拓?fù)?、中點(diǎn)箝位(neutralpointclamped,thestabilityofcontrolsystemandimprovethequalityof[9]NPC)三電平拓?fù)涞?。由于NPC三電平拓?fù)渚哂術(shù)rid-connectedcurrent.Resultsofsimulationandexperiments器件耐壓低、濾波電感小、開(kāi)關(guān)損耗低和并網(wǎng)電流showthatthetopologyoftheproposedgrid-connectedPV[9]inverterisfeasible
7、.諧波小等優(yōu)點(diǎn),得到了廣泛的應(yīng)用。由于并網(wǎng)電流為50Hz的單相交流電流,在并KEYWORDS:grid-connectedphotovoltaicinverter;without網(wǎng)電流正半周期只有逆變器上側(cè)電容放電,負(fù)半周isolationtransformer;neutralpointclampedthree-level;proportional-resonantcontrol期只有逆變器下側(cè)電容放電,導(dǎo)致中性點(diǎn)電位存在二次低頻脈動(dòng),造成輸出電流中含有較大低次諧摘要:提出了一種采用雙級(jí)無(wú)隔離變壓器的新型單相光伏并網(wǎng)逆變器拓?fù)?,?/p>
8、于光伏池板與電網(wǎng)零線直接相連,可消除波,且中性點(diǎn)電位波動(dòng)也會(huì)通過(guò)光伏陣列的分布電[10-12]光伏池板對(duì)地的共模電壓,解決了共模漏電流問(wèn)題。所提拓容產(chǎn)生共模電流。為抑制中點(diǎn)二次脈動(dòng)的電壓撲采用了高頻倍壓的方式實(shí)現(xiàn)升壓變換器與并網(wǎng)逆變器的幅值,直流側(cè)