a study on relationship of temperature rising function and system failure of inductor for renewable energy grid tied inverter

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1、AStudyonRelationshipofTemperatureRisingFunctionandSystemFailureofInductorforRenewableEnergyGridTiedInverter　　1.GridTiedPWMConverter　　2.Thecontrollerofvoltage/currentofgridtiedconvertor　　ThecommonlyusedcontrolstructureofPWMconverterhasseriesstructurewithDClinkvoltagecont

2、rolonthetopandcurrentcontrolonthebottom.　　2.1Thevoltagecontrollerofgridtiedconverter　　Comparedtocurrentcontroller，voltagecontrollerhasbiggercontrolcycle，sincethespeedofresponseofvoltagecontrollerisslowerthanthatofcurrentcontroller.　　Iftheinputpowerfrompowersupplyisbigge

3、rthantheoutputpowerthatisconsumed，DClinkvoltageisincreased，Intheoppositecase，astheDClinkvoltageisdecreased，DClinkvoltagecanbecontrolledbycontrollinginputpower.　　Thus，thiscanbeseenascontrollingDClinkvoltagebycontrollingvalidpowercurrent（qaxidcurrent）.Thefigurebelow2indic

4、atesdiagramofcurrentcontrollerwithIPcontroller.　　Fig.1.Diagramofvoltagecontroller4　　2.2Thecurrentcontrollerofgridtiedconverter　　TheCurrentcontrollertocontrolq-axid（activecomponentcurrent）currentthatcontrolsfixedpowerofDClinkvoltageandd-axid（reactivecomponentcurrent）curr

5、entthatmaintainspowerfactoras1isimprovedbyapplyingIPcurrentcontroller.　　Fig.2.DiagramofCurrentcontroller　　ThegainofIPcurrentcontrollercanbeinducedlikebelow.　　（14）　　（15）　　（16）　　3.Simulationof3phasePWMconverter　　Fig.3.3phaseAC/DCPWMconvertersimulationcircuit　　Beforeproduc

6、ing3phaseAC/DCPWMconverter，ithasbeensimulatedlikefig.3.　　ThesimulationiscomposedbyusingPSIM，simulationcodehasformedwithDLLblockinordertobedirectlyrecognizedbyhardwarecontroller.　　Alsoinordertocheckthecharacteristicsofload，theresponsepropertyischeckedbychangingthesizeofl

7、oadevery0.3second.　　Fig.4.ThesimulatedwaveformofVaphaseandTheta　　Fig.5.ThewaveformforrealofVaphaseandreferenceofVa4phase　　Thecalculatedtemperatureincreaseofinductorwithaveragecurrentandaveragelossunderdifferentelevaterloadof100%，87.5%，75%，62.5%，50%iscomparedwithactually

8、measuredtemperatureincreaseofinductor.　　Table.1.Comparisonofslopebetweenmeasuredvalueandcalculatedvaluebyeacha