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1、OpenDSSLoadAllocationandStateEstimationAlgorithmRogerDuganSr.TechnicalExecutiveEPRI942CorridorParkBlvd.Knoxville,TN37932October16,2008ThiswhitepaperdescribestheloadallocationandstateestimationalgorithmspresentlyprogrammedintotheOpenDSSprogram.Ofcourse,theusermaywriteano
2、theralgorithminanexternalprogramanddrivetheOpenDSSaccordingly.EnergyMetersandSensorsLoadallocationandtheloadallocationportionoftheEstimationprocessiscontrolledbytheEnergymeterobject.Thus,thebestresultsareachievedbyplacinganEnergyMeterobjectattheheadofeachfeederintheprob
3、lem.TheuserthenspecifiesthePeakcurrentpropertyasanArrayof3currentmagnitudes(foratypical3-phasemeter),nominallyrepresentingthe“draghand”readingsatthesubstationforeachofthethreephases.Thatis,thepeakcurrentreadingsoveramonitoringinterval.Forexample:!DefinetheEnergyMeterNew
4、Energymeter.Feeder1Element=Line.Line1Terminal=1(…otherstatements…)!ScriptforallocatingloadsEnergymeter.Feeder1.peakcurrent=[394,301,403]AllocateloadsShowCurrentsElements!seehowwellwedidSetShowExport=Yes!soExportautomaticallyappearsExportEstimation!ViewEstimationerrorsin
5、CSVfileForannualsimulations,thisisusuallythepeakcurrentfortheyear,notcountingtemporaryconditionsinwhichotherfeedersareattachedtothefeederunderstudyduringacontingency.WhentheAllocateLoadfunctionoftheEnergyMeterobjectisinvoked,itrunsdownthefeederadjustingLoadobjectAllocat
6、ionFactorandCfactorpropertiesinthedirectionneededtobettermatchthePeakcurrentvalues.WithanEnergyMeterobjectattheheadofthefeeder,Sensorobjectsmaybescatteredoverthefeeder.ASensorisabenigncircuitelementthatrepresentadeviceonthefeederorloadthatcansenseandreportsomecombinatio
7、nofvoltage,current,kwatts,andkvars.Fortheload1allocationandestimationprocess,aSensortakesresponsibilityforsettingAllocationFactorsandCfactorsforanyLoadobjectsdownstreamfromitslocationtobettermatchthevaluesinitsmeasurementregisters.Themeasurementregistersareloadedusingso
8、mecombinationoftheV,I,P,andQproperties.Thesearearrayvaluesrepresentingthenumberofphasesmonitoredbythephysicals
