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外文翻译单相SPWM逆变器并联解耦控制策略.docx

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附录6外文文献 DecouplingControlStrategyforSinglePhaseSPWMParallelInverters Shun-GangXu,Jian-PingXu,andTai-QiangCao 1.Introduction Paralleloperationofinvertersisanefficientwaytoenhancethecapacityandreliabilityofinvertersystems.Thekeyissueofparalleloperationisthedistributionoftheloadcurrent.Inaninverterparallelsystem,theamplitudesandphasesofoutputvoltagesofallinvertersshouldstrictlyequaltoeachothertoguaranteethateachinvertersharesthesameloadcurrent.Otherwise,thecurrentcircumfluenceandoverloadofsomeinvertersintheinverterparallelsystemmayexist.Thecurrentcircumfluencemayalsodecreasetheefficiencyandreliabilityoftheinverterparallelsystem. Therearevarioustechniquesforthecontrolofinverterparalleloperation.Amongthesetechniques,centralcontrolandmaster-slavecontrolareeasytoimplementandhavegoodcurrent-sharingperformance.However,thesetwocontrolstrategiesworkatthecostofsystemreliabilitybecauseofconjunctionoperationamonginverters. Ininstantaneous-currentcontrolofinverterparallelsystem,thereisacurrentbustosharethecurrentsignalamonginvertersandtheinstantaneouscircumfluenceisusedtoregulatetheoutputcurrent,eachinverterhasgoodtransientperformanceandtheparallelsystemhasgoodcurrentsharingperformance.However,itsanalogsignalcommunicationiseasytobedisturbedandthesignalisolationiscomplicated,whichdecreasethereliabilityoftheparallelsystem. Independentcontrolwithoutinterconnectiondroopstheoutputvoltageandfrequencyofinverters,thelinkamonginvertersisonlyviapowerlines.Thusfewerinterconnectionsareneededandthereliabilityofinverterparallelsystemsisimproved.Traditionally,thiscontrolstrategyassumestheoutputimpedanceofinvertersismainlyinductiveduetohighinductivecomponentofthelineimpedanceandthelargeinductorfilter.Thusactivepower-frequencydroopandreactivepower-voltagedroopschemesareadopted.However,thisisnotalwaystrueastheclosed-loopoutputimpedancealsodependsonthecontrolstrategy,andthelineimpedanceispredominantlyresistiveforlowvoltagecabling.Thus,thereiscouplingrelationshipbetweenoutputactive/reactivepowerandfr