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.In

2、aninverterparallelsystem,theamplitudesandphasesofoutputvoltagesofallinvertersshouldstrictlyequaltoeachothertoguaranteethateachinvertersharesthesameloadcurrent.Otherwise,thecurrentcircumfluenceandoverloadofsomeinvertersintheinverterparallelsystemmayexist.Thecurrentcircumfluencemayal

3、sodecreasetheefficiencyandreliabilityoftheinverterparallelsystem.Therearevarioustechniquesforthecontrolofinverterparalleloperation.Amongthesetechniques,centralcontrolandmaster-slavecontrolareeasytoimplementandhavegoodcurrent-sharingperformance.However,thesetwocontrolstrategiesworka

4、tthecostofsystemreliabilitybecauseofconjunctionoperationamonginverters.Ininstantaneous-currentcontrolofinverterparallelsystem,thereisacurrentbustosharethecurrentsignalamonginvertersandtheinstantaneouscircumfluenceisusedtoregulatetheoutputcurrent,eachinverterhasgoodtransientperforma

5、nceandtheparallelsystemhasgoodcurrentsharingperformance.However,itsanalogsignalcommunicationiseasytobedisturbedandthesignalisolationiscomplicated,whichdecreasethereliabilityoftheparallelsystem.Independentcontrolwithoutinterconnectiondroopstheoutputvoltageandfrequencyofinverters,the

6、linkamonginvertersisonlyviapowerlines.Thusfewerinterconnectionsareneededandthereliabilityofinverterparallelsystemsisimproved.Traditionally,thiscontrolstrategyassumestheoutputimpedanceofinvertersismainlyinductiveduetohighinductivecomponentofthelineimpedanceandthelargeinductorfilter.

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

8、/reactivepowerandfrequency