The unified power flow controller- a new approach...

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1、IEEETransactionsonPowerDelivery,Vol.10,No.2,April19951085THEUNIFIEDPOWFBFLOWCONTROLLER:ANEWAPPROACHTOPOWERTRANSMISSIONCONTROLL.GyqyiT.RRietmanA.EdrisC.D.SchaudaD.RTo~os.L.willirmsWestinghouseScienceWesternAreaElectricPowertiTechnologyCenterPowerAdministrationResearchInstitutepowerdemandedbyInve

2、rter2atthecommondclink.ThisdclinkAbstract-ll&papershmthattheUnifiedPowerFlowControllerpowerisconvertedbacktoacandcoupledtothetransmissionline(UPFC)isabletocontrolboththetransmittedrealpowerand,I"independently,thereactivepowerflowsatthesending-andthereceb-lnnrmirrlonUne-wing-endofthetransmission

3、line.TheuniquecapabilitiesoftheUPFCsu@yTransformer___--Inverter1Inwrler2inmultiplelineCompensationareintegratedintoageneralizedpowerflowcontrollerthatisabletomaintainprescribed,andindependentlycontrollable,realpowerandreactiveperflowintheline.ThepaperLdescribesthebasicconceptsoftheproposedgener

4、alizedPandQcontrollerandcomparesittothemoreconventional,butrelatedpowerflowcontrole~suchasthel%y&br-ControlledSeriesCapaci-torandThyristor-ControlledPhaseAngleRegulator.ThepaperalsopresentsresultsofcomputersimulationsshowingtheperformanceoftheUPFCunderdifferentsystemconditions.MeasuredVariables

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6、eorINTRODUCI'IONabsorbcontrollablereactivepower,ifitisdesired,aildtherebyitcanprovideindependentshuntreactivecompensationfortheline.TheUnifiedPowerFlowController(UPFC)wasproposed'forItisimportanttonotethatwhereasthereisaclosed"direct"pathreal-timecontrolanddynamiccompensationofactransmissionsys

7、-fortherealpowernegotiatedbytheactionofseriesvoltageinjectiontems,providingthenecessaryfunctionalflexibilityrequiredtosolvethroughInverters1and2backtotheline,thecorrespondingreactivemanyoftheproblemsfacingtheutilityindusty.powerex