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.Thekeyissueofparalleloperationisthedistributionof

2、theloadcurrent.Inaninverterparallelsystem,theamplitudesandphasesofoutputvoltagesofallinvertersshouldstrictlyequaltoeachothertoguaranteethateachinvertersharesthesameloadcurrent.Otherwise,thecurrentcircumfluenceandoverloadofsomeinvertersintheinverterparallelsystemmay

3、exist.Thecurrentcircumfluencemayalsodecreasetheefficiencyandreliabilityoftheinverterparallelsystem.Therearevarioustechniquesforthecontrolofinverterparalleloperation.Amongthesetechniques,centralcontrolandmaster-slavecontrolareeasytoimplementandhavegoodcurrent-sharin

4、gperformance.However,thesetwocontrolstrategiesworkatthecostofsystemreliabilitybecauseofconjunctionoperationamonginverters.Ininstantaneous-currentcontrolofinverterparallelsystem,thereisacurrentbustosharethecurrentsignalamonginvertersandtheinstantaneouscircumfluencei

5、susedtoregulatetheoutputcurrent,eachinverterhasgoodtransientperformanceandtheparallelsystemhasgoodcurrentsharingperformance.However,itsanalogsignalcommunicationiseasytobedisturbedandthesignalisolationiscomplicated,whichdecreasethereliabilityoftheparallelsystem.Inde

6、pendentcontrolwithoutinterconnectiondroopstheoutputvoltageandfrequencyofinverters,thelinkamonginvertersisonlyviapowerlines.Thusfewerinterconnectionsareneededandthereliabilityofinverterparallelsystemsisimproved.Traditionally,thiscontrolstrategyassumestheoutputimpeda

7、nceofinvertersismainlyinductiveduetohighinductivecomponentofthelineimpedanceandthelargeinductorfilter.Thusactivepower-frequencydroopandreactivepower-voltagedroopschemesareadopted.However,thisisnotalwaystrueastheclosed-loopoutputimpedancealsodependsonthecontrolstrat

8、egy,andthelineimpedanceispredominantlyresistiveforlowvoltagecabling.Thus,thereiscouplingrelationshipbetweenoutputactive/reactivepowerandfrequency