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新型混合储能功率变换器及控制策略研究.docx

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新型混合储能功率变换器及控制策略研究 1.Introduction Withtheincreasingdemandforrenewableenergysourcessuchaswindandsolar,energystoragehasbecomeacrucialcomponentforasustainableandefficientenergysystem.Hybridenergystoragesystems(HESS)combiningdifferenttypesofenergystoragedevicessuchasbatteries,capacitorsandsupercapacitorsprovidebetterpowerquality,reliability,andenergyefficiencycomparedtosingle-sourcestoragesystems.AkeycomponentofHESSisthehybridenergystoragepowerconversionsystem,whichconvertsandcontrolstheenergyflowbetweendifferentenergystoragedevicesandthegrid.Thispaperpresentsastudyonthedesignandcontrolstrategyofanovelhybridenergystoragepowerconverter. 2.DesignoftheHybridEnergyStoragePowerConversionSystem Theproposedhybridenergystoragepowerconversionsystemconsistsofabattery,asupercapacitor,andabidirectionalDC/DCconverter.Thebatteryprovideshighenergydensity,whilethesupercapacitorprovideshighpowerdensity.ThebidirectionalDC/DCconverterisdesignedtocontrolthepowerflowbetweenthebattery,supercapacitor,andload.Theoperationmodesoftheconverterincludechargingthebattery,dischargingthebattery,chargingsupercapacitor,dischargingsupercapacitor,andahybridmodeinwhichbothbatteryandsupercapacitorareusedsimultaneously. Tomaximizetheperformanceandefficiencyoftheconverter,anovelcontrolstrategyisproposedbasedonthedual-loopcontrolsystemwithastateofcharge(SOC)estimator.Theinnerloopcontrolstheconvertercurrentforfastresponseandstability,whiletheouterloopcontrolsthepowerflowbetweentheenergystoragedevicesbasedontheSOCestimation. 3.SimulationandExperimentalResults TheproposedhybridenergystoragepowerconverterandcontrolstrategyaresimulatedusingMATLAB/Simulink.ThesimulationresultsdemonstratetheeffectivenessoftheproposedcontrolstrategyinmaintainingtheSOCofbothbatteryandsupercapacitorwithinadesiredrange.Theconvertercanswitchbetweendifferentoperationmodesseamlessly,withthehighestefficiencyachievedinthehybridmode. Experimentaltestsareconductedonaprototypeofthehybridenergystoragepowerconversionsystem.Theresultsconfirmthesimu