opmizing investments in energy storage - home | eecs · 2017-01-26 · acknowledgements • phd...
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Op#mizingInvestmentsinEnergyStorage
DanielKirschenUniversityofWashington
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Acknowledgements
• PhDstudentsandpostdocs:– YuryDvorkin(nowatNYU)– RicardoFernandez-Blanco(nowattheEuropeanJRC)– HrvojePandzic(nowattheUniversityofZagreb)– BolunXu– YishenWang– TingQiu(soontobeatERCOT)
• SandiaNaSonalLab:– CesarSilvaMonroy– Jean-PaulWatson
• Funding:
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Goal
• OpSmizelocaSonandsizeofenergystorage• MaximizebenefitsfromspaSo-temporalarbitrage
Ø ConsidercongesSonintransmissionØ ConsideruncertaintyonrenewablegeneraSon
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OpSmalfromwhichperspecSve?
SystemOperator(SO)
EnergyStorageOwner(ESO)
MaintainReliability
MaximizeWelfare
MaximizeProfit
RecoverInvestments
UndefinedrevenueSystemexpansion
UndefinedvalueEnergy-limitedresource
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OpSmalfromwhichperspecSve?
• PerspecSveleadstodifferentproblemformulaSons– Problem1:SOperspecSve– Problem2:MixedSO-ESOperspecSve– Problem3:ESOwithtransmissionexpansion
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ProblemI:SOPerspecSve
• SOinvestsinstoragetomaximizewelfare– Benevolentmonopolist
• SO’sobjecSve:Minimize(operaSngcost+investmentcostinenergystorage)
• Subjecttoconstraintson:– Investmentsinenergystorage– OperaSonofenergystorage– SystemoperaSon:generaSonandtransmissionlimits
• ConsiderstochasScrenewablegeneraSon• ConsidercongesSoninthetransmissionnetwork(dcmodel)• FormulaSonscalabletosystemswith1000’sofbuses
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ProblemI:TestSystemandData
• Threestorageinvestmentcostscenarios(ARPA-E):– High:$75/kWhand$1300/kW– Medium: $50/kWhand$1000/kW– Low: $20/kWhand$500/kW
• Round-tripefficiencyof0.81• 10-yearlifeSme• 5%annualinterestrate
• 2024WECCsystem– 240buses,448lines,71thermalgenerators– 32windpowerand7solarpowerplants
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SOPerspecSve:OpSmalSiSngandSizing
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SOPerspecSve:OpSmalSiSngandSizing
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SOPerspecSve:OpSmalSiSngandSizing
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SOPerspecSve:OpSmalSiSngandSizing
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SOPerspecSve:ImpactoftheCapitalCost
• Theinvestmentcostistheprimarydriverofsizingdecisions– Asthecapitalcostincreases,theinstalledstoragecapacitydecreases
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SOPerspecSve:ImpactofWindSpillage
• Rate-of-return(Profit/Cost)issensiSvetovalueofwindspillage
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VoRS:ValueofRenewableSpillage
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SOPerspecSve:ImpactofWindSpillage
• InsufficientprofitfromspaSo-temporalarbitrageunderthehighcapitalcostscenario
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ProblemII:MixedSO+ESOPerspecSve
• OpSmallocaSonandsizeofmerchantenergystorageinacentrallyoperatedsystem
• ModifiedintegratedopSmizaSon– Minimize(operaSngcost+costofinvestmentinstorage)– SubjecttoconstraintsonoperaSonandinvestments
• Addaminimumprofitconstraint:
– LifeSmenetrevenue≥𝜒⋅InvestmentCost
– 𝜒isagivenrateofreturn
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ProblemII:BilevelFormulaSon
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DecisionsonStorage
InvestmentsUpperLevel:
OperaSonforTypicalDaysLowerLevel:
Storagebids/offers
LMPs,acceptedbids/offers
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ProblemII:TestSystemandData
• 8-zonemodeloftheISONEsystem– 8marketzones– 13transmissioncorridors– 76thermalgenerators– 2030renewableporoolio&load
expectaSons
• ARPA-eprojecSonsonstoragecostandcharacterisScs
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ProblemII:ImpactoftheRateofReturn
• LifeSmeProfit≥𝜒⋅InvestmentCost
– If𝜒>1→Storageinvestmentisprofitable
– If𝜒=0→Same solution as problem I
• ProfitconstraintaffectsboththesiSngandsizingdecisions– ReducSoninthetotalenergycapacity
installed– MorediversityinlocaSons
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ProblemII:ImpactoftheCapitalCost
• Resultsarestronglyaffectedbythecapitalcost
• Totalinstalledcapacityofstoragedecreaseswhencostincreases
• Underthehighestcapitalcostscenario,storageisplacedatthebuswiththehighestintra-dayLMPvariability
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CaseIII:MerchantESOPerspecSve
• ESOchoosestheopSmallocaSonsandsizesthatmaximizeitsprofits• SOminimizesthesystemoperaSngcost• Effectoftransmissionexpansion?
• FormulaSon:– ESOmaximizes(LifeSmenetrevenueofES–Costofinvestmentinstorage)– SOminimizes(OperaSngcost+Costofinvestmentintransmissionexpansion)
• Constraints– SystemoperaSon– Investmentsinenergystorage
– Profitabilityconstraint:Revenue≥𝜒⋅InvestmentCost
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TrilevelFormulaSon
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MiddleLevel
TransmissionExpansion
LowerLevel
MarketClearing
ExpansionDecisions
Dispatchdecisions
Storagebids/offers
UpperLevelMerchantStorage
Investments
LMPs,acceptedstoragebids/offers
SolvedusingaCCG-typedecomposiSon
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ProblemIII:TestSystemandData
• Threestorageinvestmentcostscenarios(ARPA-E):– High:$75/kWhand$1300/kW– Medium:$50/kWhand$1000/kW– Low:$20/kWhand$500/kW
• Round-tripefficiencyof0.81• 10-yearlifeSme• 5%annualinterestrate
• 2024WECCsystem– 240buses,448lines,71thermalgenerators– 32windpowerand7solarpowerplants
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EffectofTransmissionExpansion
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Expandlinesconnectedtostorageonly
Expandalllines
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Comparison
• SiSngof10bareriesforproblemsI,II,andIIIonthesameWECC-240systemwiththesameinputdata:
• Only3locaSonsarethesameforallthreeproblems• ProblemsIIandIIIhave7outof10commonlocaSons• BestlocaSonsfromtheSO’sperspecSvearenotnecessarily
thebestlocaSonsfromamerchantperspecSve
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Summary
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ProblemI:SOPerspec#ve
ProblemII:MixedSO-ESOPerspec#ve
ProblemIII:ESOPerspec#ve&TransmissionExpansion
MerchantperspecSve
Applicabilitytoamarketenvironment
Modelingcomplexity
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OpenresearchquesSons:Storageasatemporarymeasure
• BarerylifeSme<TransmissionlinelifeSme• NeedtoopSmizeinvestmentsovertheyearsØ CombinatorialexplosionØ TremendousuncertaintyoversystemevoluSon
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OpenresearchquesSons:MulSpleusesofstorage
• NotjustspaSo-temporalarbitrage– FrequencyregulaSon– Reserve– Peakshaving
• OperaSonalproblem– HowdowecombinetheseapplicaSons?– Stateofchargeconstraints– MulSplebeneficiaries
• Planningproblem
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OpenresearchquesSons:BarerydegradaSon
• Complexphenomenon• Dependsonthechemistryofthebarery:• Overcharge• Overdischarge• Celltemperature• Cycleaveragestateofcharge(SoC)• Currentrate(C-rate)• Cycledepth
• HowtoincorporatedegradaSoninopSmaloperaSonstrategies?
• Impactoninvestmentdecisions?
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References
• H.Pandžić,Y.Wang,T.Qiu,Y.DvorkinandD.Kirschen,"Near-OpSmalMethodforSiSngandSizingofDistributedStorageinaTransmissionNetwork,"IEEETransac*onsonPowerSystems,2015.
• Y.Dvorkin,R.Fernandez-Blanco,D.Kirschen,H.Pandzic,J.P.WatsonandC.A.Silva-Monroy,"EnsuringProfitabilityofEnergyStorage,"IEEETransac*onsonPowerSystems,2016
• R.Fernandez-Blanco,Y.Dvorkin,B.Xu,Y.WangandD.Kirschen,"EnergyStorageSiSngandSizingintheWECCAreaandtheCAISOSystem,"TechnicalReport,UniversityofWashington,2016.
• R.Fernandez-Blanco,Y.Dvorkin,B.Xu,YWang,D.S.Kirschen,“StochasScEnergyStorageSiSngandSizing:AWECCCaseStudy”,IEEETransacSonsonSustainableEnergy,earlyaccess
• Y.Dvorkin,R.Fernandez-Blanco,D.Kirschen,Y.Wang,B.Xu,H.Pandzic,J.P.WatsonandC.A.Silva-Monroy,"Co-planningofInvestmentsinTransmissionandMerchantEnergyStorage,"IEEETransac*onsonPowerSystems,2017
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