单相SPWM逆变器并联解耦控制策略.doc

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1、英文资料原文来源:出自JOURNALOFELECTRONICSCIENCEANDTECHNOLOGYOFCHINA,VOL.7,NO.3,SEPTEMBER2009DecouplingControlStrategyforSinglePhaseSPWMParallelInvertersShun-GangXu,Jian-PingXu,andTai-QiangCaoAbstract:Adecouplingcontrolstrategyofinverterparallelsystemisproposedbasedontheequivalentoutputimpedance

2、ofsinglephasevoltagesourceSPWM(sinusoidalpulsewidthmodulation)inverter.Theactivepowerandreactivepowerarecalculatedintermsofoutputvoltageandcurrentoftheinverter,andsenttotheotherinvertersintheparallelsystemviacontrollerareanetwork(CAN)bus.Bycalculatinganddecouplingthecircumfluenceofthe

3、activepowerandreactivepower,theinverterscanshareloadcurrentviatheregulationofthereference-signalphaseandamplitude.Experimentalresultsofan110V/2kVAinverterparallelsystemshowthefeasibilityofthedecouplingcontrolstrategy.IndexTerms-CANbus,currentsharing,inverters,paralleloperation.1.Intro

4、ductionParalleloperationofinvertersisanefficientwaytoenhancethecapacityandreliabilityofinvertersystems.Thekeyissueofparalleloperationisthedistributionoftheloadcurrent.Inaninverterparallelsystem,theamplitudesandphasesofoutputvoltagesofallinvertersshouldstrictlyequaltoeachothertoguarant

5、eethateachinvertersharesthesameloadcurrent.Otherwise,thecurrentcircumfluenceandoverloadofsomeinvertersintheinverterparallelsystemmayexist.Thecurrentcircumfluencemayalsodecreasetheefficiencyandreliabilityoftheinverterparallelsystem.Therearevarioustechniquesforthecontrolofinverterparall

6、eloperation.Amongthesetechniques,centralcontrolandmaster-slavecontrolareeasytoimplementandhavegoodcurrent-sharingperformance.However,thesetwocontrolstrategiesworkatthecostofsystemreliabilitybecauseofconjunctionoperationamonginverters.Ininstantaneous-currentcontrolofinverterparallelsys

7、tem,thereisacurrentbustosharethecurrentsignalamonginvertersandtheinstantaneouscircumfluenceisusedtoregulatetheoutputcurrent,eachinverterhasgoodtransientperformanceandtheparallelsystemhasgoodcurrentsharingperformance.However,itsanalogsignalcommunicationiseasytobedisturbedandthesignalis

8、olati