Thesis - Power quality improvement of distribution networks

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1、POWERQUALITYIMPROVEMENTOFDISTRIBUTIONNETWORKSUSINGDYNAMICVOLTAGERESTORERThesissubmittedinpartialfulfillmentoftherequirementsfortheawardofdegreeofMASTEROFENGINEERINGINPOWERSYSTEMS&ELECTRICDRIVESSubmittedby:AMANDEEPBANGARRollNo-800941002Underthesupervisionof:Mr.PARAGNIJHAWANAssistantProfessor,EIED

2、JULY2011ELECTRICAL&INSTRUMENTATIONENGINEERINGDEPARTMENTTHAPARUNIVERSITYPATIALA––147004iiiABSTRACTPowerqualityisoneofmajorconcernsinthepresentera.Ithasbecomeimportant,especially,withtheintroductionofsophisticateddevices,whoseperformanceisverysensitivetothequalityofpowersupply.Powerqualityproblemi

3、sanoccurrencemanifestedasanonstandardvoltage,currentorfrequencythatresultsinafailureofenduseequipments.Oneofthemajorproblemsdealthereisthepowersag.Sensitiveindustrialloadsandutilitydistributionnetworksallsufferfromvarioustypesofoutagesandserviceinterruptionswhichmayresultinasignificantfinancial1

4、oss.Toimprovethepowerquality,custompowerdevicesareused.ThedeviceconsideredinthisworkisDVR.Thisthesispresentsmodeling,analysisandsimulationofaDynamicVoltageRestorer(DVR)testsystemsusingMATLAB.Inthiswork,PIcontrollerandDiscretePWMpulsegeneratorareusedforthecontrolpurpose.Here,differentfaultconditi

5、onsareconsideredforlinearaswellasinductionmotorload.TheroleofDVRtocompensateloadvoltageisinvestigatedduringthedifferentfaultconditionslikevoltagesag,singlephasetoground,doublephasetogroundfaults.Inaddition,theapplicationofDVRtocompensatetheproblemofstartingvoltagedipforinductionmotorisalsoinvest

6、igated.iiiLISTOFABBREVIATIONSSLG-SingleLinetoGroundIEEE-InstituteofElectricalandElectronicEngineersEMC-ElectromagneticCompatibilityCRT-CardiacResynchronizationTherapyAGC-AutomaticGenerationControlPWM-PulseWidthModulationDC-DirectCurrentSMES-SuperconductingMagnetEnergyStorageFACTS-FlexibleACTrans

7、missionSystemsAC-AlternatingCurrentCPD-CustomPowerDeviceAPF-ActivePowerFiltersBESS-BatteryEnergyStorageSystemsDSTATCOM-DistributionStaticSynchronousCompensatorsDVR-DynamicVoltageRestorerUPS-UninterruptiblePowerSuppliesPQD-Po