同相供电装置控制策略研究

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1、西南交通大学硕士学位论文同相供电装置控制策略研究姓名：魏光申请学位级别：硕士专业：电力系统及其自动化指导教师：李群湛20090401西南交通大学硕士研究生学位论文第lI页AbstractConsideringtheproblemsexistedintheelectrictractionpowersupplysystemofelectrifiedrailway,suchasabundantnegativesequence、harmonicsandreactivepower,andthelostoftractionspeedandpowerwhicharerestr

2、ictedbytheneutralsectioninsulatorbetweenadjacentpowersupplysections，anewtypeofcophasetractionpowersupplysystemisbuiltbycombiningYN，vdconnectiontransformerwithIPFC(IntegratedPowerFlowController)．Thesystemcancomb-outthree-phaseunbalancebasically,andprovidesminimumharmoniccontent，thereb

3、y,theinconsistencybetweenrailwaydepartmentandelectricpowerdepartmentwillbesolvedradically．TheremoveoftheneutralsectioninsulatorconformtOthetrendoftheHigh—SpeedPassengerServiceandtheHeavyCargoService．Inthispaper’thestructureofcophasetractionpowersupplysystemandtheperformanceoftheYN，vd

4、balancetransformerarediscussed，thestructureoftheIPFC、theprincipleofbalancedtransformationandthecontrolstrategygeneralframeworkareanalyzed．Intermsofhierarchicalstructure，thepaperspecifiedbaselayerconvertercontrolstrategy,middlelayercompensationpowerflowcontrolstrategyandtoplayercoordi

5、nationcontrolstrategyrespectively．Thefeasibilityoftheschemeisverifiedbythesimulationresult．Thepreconditionofpowerqualitycompensationaredetectionanddecompositionofthelocomotivecurrent．Andthroughthepowerflowanalysis，solvingforcompensatinginstructioncurrents．Themiddlelayerproposedcomple

6、tecompensationstrategyandcompletecompensationstrategy,andcomparisonanalysishadbeenmadefromsteady-statetodynamicperformance．Whiletheinstructioncurrentsaregiven，itneedsthebaselayertocontrolpowerelectroniccomponentstrackingthemfastandaccurately．Thispaperintroducedfivecontrolstrategysinc

7、ludingtriangle—wavemodulation，carrierphaseshiftedSPWMtecnology,hysteresiscurrenttrackingcontrol，instantaneousvaluecomparisoncontrolandone-cyclecontrol，whichhavetheirstrongpoint．Inthetransfixionpowersupplymodel，tractionsubstationscommunicatedwitheachothertOdistributecapacityresponsibl

8、yforsuppling