Xcel - Interconnection ssytem impact study report

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1、InterconnectionSystemImpactStudyReportRequest#GI-2008-2334MWSolarGenerationRanchatHartsel,ColoradoPublicServiceCompanyofColoradoTransmissionPlanningAugust19,2010ExecutiveSummaryPublicServiceCompanyofColoradoreceivedaninterconnectionrequest(GI-2008-23)toinstalla34MWsolarphotovolta

2、ic(PV)generationfacilityatHartsel,Colorado.TheproposedinterconnectionpointistheHartsel230kVsubstation.ThissubstationisconnectedtolinesterminatingattheMalta230kVandTarryall230kVsubstations(seeFigures1&2below).Thesolargeneratingfacilitieswouldbeconnectedviaacustomerownedradial230kV

3、line.TherequestedinservicedatewasoriginallyJune1,2010.Itisnowearly2011.TheFeasibilityStudyforthisrequestwasissuedAugust7,2009.Basedonthenewinservicedate,loadflowstudieswereagainperformedaspartoftheSystemImpactStudy.However,thecustomerindicatedintheinterconnectionrequestthatthePVi

4、nvertersaredesignedtofollowsystemvoltageandfrequencyandhaveno“inertial”operatingcharacteristics.Therefore,dynamicstudieswerenotperformedaspartofthisSystemImpactStudy.1ThisrequestwasstudiedasanEnergyResourceatthefull34MWrequestedgenerationlevelforboththe2011and2016studyyears.These

5、investigationsincludedsteady-statepowerflowandshortcircuitanalyses.Therequestwasstudiedasastand-aloneprojectonly,withnoevaluationsmadeofotherpotentialnewgenerationrequeststhatmayexistintheLargeGeneratorInterconnectionRequest(LGIR)queue,otherthanthegenerationprojectsthatarealready

6、approvedandplannedtobeinservicebyJune2011andJune2016.ThemainpurposeofthisSystemImpactStudywastoevaluatethepotentialimpactonthePSCotransmissioninfrastructureaswellasthatofneighboringutilitieswheninjectingtheproposed34MWofgenerationattheinterconnectionpointattheHartselSubstation,an

7、ddeliveringtheadditionalgenerationtonativePSColoads.ThecoststointerconnecttheprojectwiththetransmissionsystemwerealsoevaluatedbyPSCoEngineering.1EnergyResourceInterconnectionServiceshallmeananInterconnectionServicethatallowstheInterconnectionCustomertoconnectitsGeneratingFacility

8、totheTransmissionProvider’sTransmissionS