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1、Three-PhaseGrid-ConnectedPhotovoltaicSystemwithSVPWMCurrentController111223HuiZhang,HongweiZhou,JingRen,WeizengLiu,ShaohuaRuanandYongjunGao1DepartmentofElectricalEngineering,Xi'anUniversityofTechnology,Xi'an710048,China2XinJiangSunOasisCo.,Ltd,Urumqi830011,China3Xi'anYongdianEle
2、ctricCo.,Ltd,Xi'an710015,ChinaEmail:zhwboy479013@yahoo.com.cnAbstract-Effectivecontrolstrategiesforreliablephotovoltaicvoltagesourceinverters(VSI)cangiveaquasi-optimal(PV)grid-connectedsystemsareneededtoefficientlyusesolarswitchingpattern,thestressandlossesinswitchingdevicesaree
3、nergy,anabundantandcleanrenewableenergysource.Aspacereduced,andthelinecurrentwaveformisalsoimproved[2-3].vectorpulsewidthmodulation(SVPWM)hasbeenwidelyappliedTomeetthestandardIEEE929-2000[4]forutilityinterfaceofinthecurrentcontrolofthree-phasevoltagesourceinvertersPVsystemssucha
4、spowerquality,safetyandprotection(VSIs).Thecontrolstrategycombinesaconstantvoltagetrackingfunctions.thecurrentcontrolstrategyofgrid-connectedmethodforthevariablephotovoltaicpowerwithSVPWM-basedinvertersplaysadominantroleinprovidinghighqualitypowerproptional-intergral(PI)currentc
5、ontrollerinasinglestagetoelectricgrids.Thecurrent-controlledSVPWMinverteristhree-phasePVgrid-connectedsystem.Thecontrollermimicsadapttothree-phasePVgridconnectedsystem[2,5,9-10].deadbeatcontrolinthesynchronousd–qreferenceframe,andisInthispaper,three-phaseSVPWMvoltage-sourceinver
6、terisverysimpleandrobusttoimplement.WiththenecessarygridemployedforPVgrid-connectedsystem.ThecontrolschemeofvoltagedetectioninPhotovoltaicsystemsforprotection,gridathreephasecurrent-controlledSVPWMinverterinrotatingharmonicsdisturbanceiseffectivelysuppressedthroughsynchronouscoo
7、rdinated-qwithfeed-forwardcompensationisfeed-forwardcompensation.Thesimulationresultsshowthatthepresented,whichemploysmulti-loopcontrolwiththefiltercurrentcontrollermakesthePVgrid-connectedVSIoutputinductorcurrentoftheinverterinnerlooptoachievefastcurrenttobeinphasewiththegridvo
8、ltageandhasanexcellentdynamicresponseandtheoute
