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1、摘要ABSTRACTWiththeimprovementofsmartgridtechnologyrequirements,therearemoreandmoresubstationprotectionandcontrolload,therequirementofautomaticandintelligentequipmentalsoincreaseaccordingly,soitismorestricttoensurethehighreliabilityofdcsystemprotectionelectricaloverloadprotection,shortcircuitpr
2、otectioninthesubstationdcpowersupplysystem,wemustmakesureitdoesnotactaboveordoesnotrefusetomove,especiallythenexthigherlevelcan'tact,otherwisetheresultmaycausethedamageofthepowercomponents,accidentthatcausedwidespreadpoweroutagesexpands.Therefore,thestategridforpowersystemdcpowersupplyreliabi
3、lity,putforwardaseriesofresearchworkrequirements,oneofthemisdcsystemshort-circuitdifferentialcircuitbreakerconfiguration.Inrecentyears,mostofstudyingdifferentialcooperationusedshortcircuittest,throughsimulatingtheactualrunningenvironmenttounderstandthedifferentialcoordinationcharacteristicsun
4、derdifferentcircumstanceswithdifferenttypesofsubstationbreakers.Butthisstudy,itcangetalotofdifferentialcoordinationwithalotofhumancostandtime,itispoormaneuverability,andit'smorequalitativeanalysis,anditdidnotprovideastudyondifferentialtocooperateinthedcsystem.Inordertoimprovethedepthofdcsyste
5、mresearch,thispaperdesignsthecircuitbreakerwithsoftware,itisabletocalculatethephaseshortcircuitcurrentprotectionappliancesexportquantitatively,judgesthedifferentialcooperatesituationofthebreaker,ensurethechoosingreliabilityoftheprotectionappliances;Andithassensitivityanalysistoensureprotectio
6、nofelectricalsensitivity.Thesoftwareprovidesastrongguaranteeindevelopmentofmatchproblemfordifferentialtransformersubstationdcsystem.Thispaperfirstintroducesthecharacteristicsof220VDCsysteminthetypical220kVsubstation,discussesthedcrippleofcircuittopology,introducesthepowersupplyripplevoltageca
7、lculationformulaofhighfrequencyswitch.Itisconcludedthattheoutputvoltageripplecomponentcanbegreatlyreducedbythehighfrequencyswitchingpowersupplydcsystem,itsoutputvoltagecanbeconsideredconstantvoltageamplitudeof220withoutchanging,thisprovidesas
