级联svg控制策略分析及fpga控制器设计-analysis of cascade svg control strategy and design of fpga controller.docxVIP

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级联svg控制策略分析及fpga控制器设计-analysis of cascade svg control strategy and design of fpga controller.docx

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级联svg控制策略分析及fpga控制器设计-analysis of cascade svg control strategy and design of fpga controller

AbstractThepowerqualityattheendoftheexistingelectricpowersystemissopoorthatcannotsatisfytherequirementofpeople.However,thedemandsforelectricityandpowerqualityhavebecomingmoreandmorehigh.Tosolvetheproblemofelectricpowerqualityisimminent.Achievingthereactivecompensationandsuppressingtheharmonicwithactivefilterattheload-sideismainlyusedtosolvetheseproblems.CascadedH-bridgeSVGisthemaintopologyoftheactivefilterwithcompacttopologyandlessswitchingdevices,comparedtotheotherkindsofconverters.Itscapacityisalsoeasytoenlargeandthecontrollerissimpletodesign.Theseadvantagesmakethetypeofreactivepowercompensationdevicecanbethemostwidelyusedengineeringapplication.ResearchingandimprovingcontrolstrategyforthecascadedH-bridgeSVGhasanimportantsignificance.Inthispaper,thecascadedH-bridgeSVGwastheobjectofstudy.Firstofall,itsdomesticandinternationalstatusandbackgroundwerereviewed;thenthispaperintroducedthedesignoftheexperimentplatform,presentingthemaincircuitstructureofthepowerunitmoduleandthecommonlyusedmodulationofthecascadeH-bridgeSVG—CPS-PWMinmoredetail.Thenthispaperrecommendedthreecommonlyusedcurrentcontrollingmethods,includingtheirprinciplesandsimulationresults.AndsummarizedthatthedecouplecontroltechnologywouldlowthedynamicresponseoftheSVGspeedwhensurpressingtheharmoniccurrent;currenthysteresiscontroltechniquewasofgoodreal-timeperformance.However,it’smoredifficulttorealizeinthecascadeSVG;Dead-beattechniqueusedwithCPS-PWMmodecanbeincombinedwithcascadeSVG,andresponsefast.Finally,thepaperselectedthedead-beattechnologytocontrolthecurrentdirectly.Meanwhile,onthebasisoftheanalysisforphase-in-phasevoltageimbalancefactors,thispapercomparedtwocommonlyusedDCvoltagebalancingcontrolstrategiesinphase:controllingthereferencevoltagefortheunit;changingthePWM.Basedontheanalyses,thispaperconcludedthatthefirstmethodwasnotstableandthelatterregulationwascomplexwhichwillleadthepowerunitsworkatdifferentfrequency.ThepaperproposedonenewstrategytorealizethebalanceforDCvoltageineachphasebycontrollingthedutycyc