外文翻译---单相spwm逆变器并联解耦控制策略

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1、附录6外文文献DecouplingControlStrategyforSinglePhaseSPWMParallelInvertersShun-GangXu,Jian-PingXu,andTai-QiangCao1.IntroductionParalleloperationofinvertersisanefficientwaytoenhancethecapacityandreliabilityofinvertersystems.Thekeyissueofparalleloperationisthedistributionoftheloadcurrent

2、.Inaninverterparallelsystem,theamplitudesandphasesofoutputvoltagesofallinvertersshouldstrictlyequaltoeachothertoguaranteethateachinvertersharesthesameloadcurrent.Otherwise,thecurrentcircumfluenceandoverloadofsomeinvertersintheinverterparallelsystemmayexist.Thecurrentcircumfluenc

3、emayalsodecreasetheefficiencyandreliabilityoftheinverterparallelsystem.Therearevarioustechniquesforthecontrolofinverterparalleloperation.Amongthesetechniques,centralcontrolandmaster-slavecontrolareeasytoimplementandhavegoodcurrent-sharingperformance.However,thesetwocontrolstrate

4、giesworkatthecostofsystemreliabilitybecauseofconjunctionoperationamonginverters.Ininstantaneous-currentcontrolofinverterparallelsystem,thereisacurrentbustosharethecurrentsignalamonginvertersandtheinstantaneouscircumfluenceisusedtoregulatetheoutputcurrent,eachinverterhasgoodtrans

5、ientperformanceandtheparallelsystemhasgoodcurrentsharingperformance.However,itsanalogsignalcommunicationiseasytobedisturbedandthesignalisolationiscomplicated,whichdecreasethereliabilityoftheparallelsystem.Independentcontrolwithoutinterconnectiondroopstheoutputvoltageandfrequency

6、ofinverters,thelinkamonginvertersisonlyviapowerlines.Thusfewerinterconnectionsareneededandthereliabilityofinverterparallelsystemsisimproved.Traditionally,thiscontrolstrategyassumestheoutputimpedanceofinvertersismainlyinductiveduetohighinductivecomponentofthelineimpedanceandthela

7、rgeinductorfilter.Thusactivepower-frequencydroopandreactivepower-voltagedroopschemesareadopted.However,thisisnotalwaystrueastheclosed-loopoutputimpedancealsodependsonthecontrolstrategy,andthelineimpedanceispredominantlyresistiveforlowvoltagecabling.Thus,thereiscouplingrelationsh

8、ipbetweenoutputactive/reactivepowerandfrequency