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1、ANovelMultilevelPowerQualityCompensatorforElectrifiedRailway1112LonghuaZhou,QingFu,XiangfengLiandChangshuLiu1InstituteforSolarEnergySystem,SunYat-senUniversity,Guangzhou,51006,China2TitansTechnologyCo.,Ltd,Zhuhai,519000,ChinaAbstract-Connectedtohigh-voltagepowersystemdirectly,t
2、hepowertoelectriclocomotivesviatractionpowersystem.electrifiedrailwayisaparticularusertopowersystem,anditsSincethetractionloadsarenon-linear,asymmetricandloadshavethecharacteristicssuchasnon-liner,asymmetryandfluctuating,manypowerqualityproblemsarecausedsuchasvolatilityandsoon.
3、ResearchedonChunshentractionsubstationunbalancethree-phaseharmonics,fundamentalnegativewhichbelongstoShanghai-HangzhouElectrifiedRailway,andsequencecurrentandalargeamountofreactivepowerwhichaccordedtotherequirementsandcharacteristicsofaffectthepowerfactor,harmtheapplicationsand
4、thelinecomprehensivemanagementtoharmonics,reactivepowerandseriously.Weshouldpaysufficientattention,responsesandnegativesequencecurrentsinelectrifiedrailway,thispaperworksoneliminatingtheeffectsproducedbyelectricproposesanovelMultilevelPowerQualityCompensatorlocomotivestopowersy
5、stem[2,3].(MPQC).ThisnovelMPQCiscomposedoftwosingle-phaseTomeetthedemandsofhigh-voltage,large-powercascadedinvertersbysharingtheDCcapacitors.Eachcascadedcompensationofharmonics,negativesequencecurrentandinverterismadeoftwocascadedH-bridgeinvertersandthereactivepowerinelectrifie
6、drailway,andaccordingtotheratiooftheDCvoltageis3:1,then,connectstotractionpowerfeaturesofelectrifiedrailway,thisworkpresentedanovelsystemviagrid-transformer.ByanalyzingtheworkingprinciplepowerqualitycompensatorbasedonmultilevelinverteroftheMPQC,researchingtheMultilevelDirectPul
7、seWidth(Multilevelpowerqualitycompensator,MPQC).MultilevelModulation(MDPWM)method,thisworkpresentedmultilevelinvertersareusedmoreandmorewidelyinhigh-voltageinvertercontrolstrategybasedonenergybalance.Simulationlarge-capacityapplicationsforthoseuniqueadvantages,andandExperimenta
8、lresultsprovedthisnovelMQPCwasreliable,themainfeatures
