牵引供电系统电能质量改善方案研究

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1、北京交通大学硕士学位论文牵引供电系统电能质量改善方案研究姓名：南征申请学位级别：硕士专业：电气工程指导教师：王玮;叶柏洪20081201ABSTRACTTheelectrificationrailwayhasbeenallimportanttrendforthedevelopmentofChineserailwayindustry．Theelectrificationrailwaysystemtakeselectricityasthepowersource．Supportingbythetractionpowersupplysystem，theelectr

2、iclocomotiveandMultiUnitplaythetransportationrolesbypullingthetrainbasedonthetrainworkingdiagram．AssinglephasepowerfrequencycurrentisusedtosupplythepowerforelectriclocomotiveandMultiUnit,negativesequencecurrent，harmonicscurrentandinductive10adcurrentinthepower百rdwillcausealotofadd

3、itionallossesanddecreasepowerenergyutilizingrateoftheelectrificationrailwaysystem．Alltheseissueswilldecreasenotonlytheutilizationrateofpowersupplyequipment，butalsothepowerqualityofthe酣d，orevenmakethegeneratingequipmentoperateabnormallyorinfaultcondition．Toimprovetheissueswillllitt

4、hetargetofenergysavingandlossesreduction．Bystudyingandcomparingthetreatmenttechnologyfornegativecurrent，treatmenttechnologyforharmonics，reactivepowercompensationtorealizetheimprovementoftheenergysavingmeasurementinelectrificationrailwaysystem．Thesetopicsarepaidmoreattentionnotonly

5、bytheacademiccirclesbutalsobytheadministrationdepartmentfromeachrailwaybureau，bywayofscientificresearchprojectandengineeringprojecttostudyandapplytherelatednewtechnologyandpushthefastdevelopmentofrelatednewtechnology．Theexistenceofnegativecurrenthasdirectimpacttheworkingqualityand

6、efficiencyofthegeneratorsandwillcausefaultofthegeneratorinworsecondition．Especiallywhenthegridhassmallscalecapability,thenegativeimpactwillbeevendramatic．Solutionforresolvingtheproblemistoimprovethedesignofthetractiontransformer．Thelatestresearchfindingistotakethewayofactivepowerd

7、ynamiccompensationforthenegativecurrenttotreatthenegativecurrent．Traditionallytreatmentforharmonicsandreactivepowerisusingthetechnologyonsteadycompensation，inrecentyearsmanydynamiccompensationtechnologiesweredevelopedandverifiedbytestingandhaveengineeringapplication．Varietyoftreat

8、mentexperiencehasbeenaccumulateda