sharyland loma alta hvdc project 061611 · june 2011 sharyland loma alta hvdc project confidential...

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SHARYLANDLOMAALTAHVDCPROJECT

CONFIDENTIALSTRATEGICPROJECTSB&VENERGY

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ContentsHVDCTechnologyCostEstimates&ScheduleConclusions&NextSteps

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HVDCTECHNOLOGY

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Technology:WhyHVDC?

Powerflowiscontrollable BypassescongestedACcircuitsw/oinadvertentflow

BipoleDCperformssimilartodblckt AClineundercontingencies

Protectsagainstcascadingoutages Powerflowcanbemaintainedatreducedlevelsduringlossofonepolebyswitchingtomonopolewithmetallicreturn

Cancarrymorepowerwithreducedlossesforagivensizeofconductor

LowercostperMWofdeliveredcapacity($/MW)forlargesystems

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Technology:VoltageSourceConverters VSCmarketedasHVDCLightbyABBandasHVDCPlusbySiemens

InsulatedGateBipolarTransistor(IGBT)technologydoesnotrequirestrongACsourcesforcommutation

LowShortCircuitratiorequirements Doesnothaveminimumtransferrequirements Minimalfilteringisrequiredattheterminals Smallerterminalfootprintandeasiertoharden toimprovereliability

Presenttechnologybeingusedonundergroundandsubmarinelinesbuthaslimiteduseandexperienceonoverheadlines

Allowsuseofsoliddielectriccabletechnologyforsubmarinecables

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Technology:ClassicHVDC

Extensivetrackrecordupto800kV ConverterterminalstypicallylessexpensivethanVSCterminalsbutreactivecompensationrequirementsdriveupcosts

ThyristorvalvetechnologyrequiresstrongACsourcesforcommutation

HigherShortCircuitratiorequirementsoftenresultinginneedforsynchronouscondensersorotherdevices

Minimumtransferrequirements Filteringrequiredattheterminals Largefootprintrequiredatterminals

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Technology:WhyMetallicReturn? Improvedoperationalreliabilityandflexibility Bipoleoperationdoesnotrequireseparatereturnpath;monopoleoperationwillrequirereturnpath

Sustaineduseofearthreturnduringmonopoleoperationoftennotpermittedforenvironmentalreasons(e.g.impactonotherburiedutilities)

Plannedevents,suchasplannedmaintenance,requiringsustainedmonopoleoperationmayusemetallicreturn

MetallicreturnconfigurationachievedbycontrolledswitchingproceduresMetallicreturncanincludeaseparatereturnconductororcanbeimplementedbyswitchingtotheremainingunusedpoleifserviceable

Unplannedeventsmayuseearthreturnforinitialperiod(minutes)andthenswitchtometallicreturn(hourstoweeks)

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Technology:ExampleSubmarineProjects

ProjectName: CrossSoundLocation: NewYork Conn.Voltage: 150kVHVDCCapacity: 330MWTechnology: ABBHVDCLight(VSC)SeaRoute: 25milesLandRoute: 1mileProjectStatus: Incommercialoperation

since2002

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ProjectName: TransBayLocation: SanFranciscoBayVoltage: 200kVHVDCCapacity: 400MWTechnology: SiemensHVDCPlus(VSC)SeaRoute: 53milesLandRoute: 1mileProjectStatus: Incommercialoperation

since2010

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ProjectName: BorWin1Location: NorthSeaVoltage: 150kVHVDCCapacity: 400MWTechnology: ABBHVDCLight(VSC)SeaRoute: 77milesLandRoute: 46milesProjectStatus: Incommercialoperation

since2009

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ProjectName: DolWin1Location: NorthSeaVoltage: 320kVHVDCCapacity: 800MWTechnology: ABBHVDCLight(VSC)SeaRoute: 46milesLandRoute: 56milesProjectStatus: 2013Completion

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ProjectName: SylWin1Location: NorthSeaVoltage: 320kVHVDCCapacity: 864MWTechnology: SiemensHVDCPlus(VSC)SeaRoute: 99milesLandRoute: 28milesProjectStatus: 2014Completion

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ProjectName: MAPPLocation: ChesapeakeBayVoltage: 320kVHVDCCapacity: 2000MWTechnology: ABBHVDCLight(VSC)SeaRoute: 39milesLandRoute: 44milesProjectStatus: 2015Completion

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ProjectName: AtlanticWindConnection

Location: MidAtlanticCoastVoltage: 320kVHVDCCapacity: 7000MW(total)

2000MW(maxperprojectphase)

Technology: VSCSeaRoute: ~600milesLandRoute: ~50milesProjectStatus: 20162020

StagedCompletion

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Technology:SubmarineCableInstallationCableLaying CableBurialPlowing

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COSTESTIMATES&SCHEDULE

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OrderofMagnitudeCostEstimates

Costestimatesinclude:HVDCconverterstationsACsubstationsadjacenttoeachconverterstationSynchronouscondensersatsouthernterminalforHVDCClassicLatticetowerstructuresand2conductorsperpoleonoverheadoption1cableperpoleonunderground/submarineoptionMetallicneutralcable

Costestimatesdonotinclude:UpgradestoexistingsystemnotincludedinthereportCostofremoteinterconnectionCostofrightofway/siteOwnerscosts Development/permittingcosts

CCNProcess Financingcosts Constructionmanagement

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EstimatedProjectCost OverheadOptionVSC Technology HVDC Classic

GeneralPeak Delivered Power (MW) 1000 1000Line Voltage +/- 320 kV HVDC +/- 400 kV HVDCMiles of Bipole HVDC Overhead Lines 220 220

Line RatingLine Losses at Peak Line Loading 3.2% 2.0%Terminal Losses at Peak Load (2 Terminals) 2.0% 1.5%Total Peak Losses 5.2% 3.5%Conductor Rating (MW) 1,052 1,035Conductor Size Per Pole (2) 1943 TWD (2) 1943 TWD

Total Project Capital CostsBipole HVDC Overhead Lines ($M) $264 $266Two HVDC Converter Stations ($M) $300 $260AC Substations ($M) $40 $40Reactive Compensation [Synch. Cond.] ($M) $0 $60System Impacts ($M) TBD TBD

Total Capital Cost ($M) $604 $626

Capital Cost per MW of Delivered Capacity ($/MW) $604,000 $626,000

Furthercostoptimizationofconverterswouldreduceprojectcost

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EstimatedProjectCost SubmarineOptionGeneral

Peak Delivered Power (MW) 1000Line Voltage +/- 320 kV HVDCMiles of Alignment 160Miles of Bipole HVDC Submarine Lines 150Miles of Bipole HVDC Underground Lines 10

Line RatingLine Losses at Peak Line Loading 5%Terminal Losses at Peak Load (2 Terminals) 2%Total Peak Losses 7%Cable Rating (MW) 1,070Submarine Cable Size Per Pole (1) 2400 mm CUUnderground Cable Size Per Pole (1) 2500 mm CU

Total Project Capital CostsBipole HVDC Submarine Lines ($M) $525Bipole HVDC Underground Lines ($M) $45Two HVDC Converter Stations ($M) $300AC Substations ($M) $41System Impacts ($M) TBD

Total Capital Cost ($M) $911

Capital Cost per MW of Delivered Capacity ($/MW) $911,000

Furthercostoptimizationofconverterswouldreduceprojectcost CablecostsbasedonlongestdistancetoNorthernTerminal

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HighLevelSchedule OverheadOption

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Detailed Design

Equipment & Material Procurement

Preliminary Design and Studies

Preliminary Project Approvals

EIS Activities

Land Rights

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Project Definition

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Construction Procurement

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HighLevelSchedule SubmarineOption

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Project Definition

Preliminary Design and Studies

Preliminary Project Approvals

EIS Activities

Land Rights

Detailed Design

Equipment & Material Procurement

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CONCLUSIONS&NEXTSTEPS

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Conclusions BothSubmarineandOverheadOptions:

Providefullycontrollable1,000MWcapability,andabilitytomanagecongestedACcircuits

Protectsagainstcascadingoutages Cancarrymorepowerwithreducedlossesforagivensizeofconductor

LowercostperMWofdeliveredcapacity($/MW)forlargesystems

SubmarineOption:MostreliablealternativetoERCOTforcoastalregionMostreliablealternativetoERCOTforcoastalregionHVDC/VSCisthepreferredchoiceforsubmarinetransferofHVDC/VSCisthepreferredchoiceforsubmarinetransferof1000MW1000MW

GridconnectedHVDCoptionsatLomaAlta,Pawnee,andCorpusChristiarea(WhitePoint,LasBrisas orBarneyDavis)appeartobeviable

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NextSteps

RecommendERCOTtoperformUPLANbasedeconomicassessment IdentifyproductioncostsavingsfollowingincorporationHVDClinevs.ACsolutions

ReviewPowerSystemStudiestodetermineoptimalcapacityandperformancerequirements ACpowerflowanalysis Reactivepowerrequirementsofexistingsystem Assessmostviabletechnology(HVDCorHVDClight)forPawneeproject

DynamicandSSTIAnalysis Performfield/routeconstraintsreviewandupdatepreliminaryrouteandpermittingrequirements

Updatecostestimates

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AppendixMaps

sharyland loma alta hvdc project 061611 · june 2011 sharyland loma alta hvdc project confidential...

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