Pecan Street Project – A “Green” Development
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PECAN STREET PROJECT – A “GREEN” DEVELOPMENT Center for Electromechanics Pecan Street, Inc. SWEDE 2013 May 5, 2013 Austin, Texas Dr. Fabian Uriarte Center for Electromechanics University of Texas at Austin
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Center for Electromechanics. Pecan Street, Inc. Pecan Street Project – A “Green” Development. SWEDE 2013 May 5 , 2013 Austin, Texas. Dr. Fabian Uriarte Center for Electromechanics University of Texas at Austin. Smart Grid Location. Pecan Street offices. Texas Advanced Computing Center. - PowerPoint PPT Presentation
Transcript of Pecan Street Project – A “Green” Development
Slide 1
Pecan Street Project A Green Development
Center for Electromechanics
Pecan Street, Inc.SWEDE 2013May 5, 2013Austin, Texas
Dr. Fabian UriarteCenter for ElectromechanicsUniversity of Texas at AustinWhat is Pecan Street, Inc.?R&D organization headquartered @ UT AustinFocus Test advanced technology Understand customer behaviorFlagship EffortsDemonstration smart gridImprove the way we use energy
Smart Grid Location
Pecan Street officesMueller Community
Texas Advanced Computing CenterCtr. for Electromechanics
pecanstreet.org3
Homes735Transformers94Solar panels200Electric vehicles100One-line Diagram
Electrical DistributionMueller Community, Austin, Texas735 homes (so far)94 transformers200 solar panels100 electric vehicles
-This is the distribution system for the Mueller Community-As seen, the entire community is fed from a single 3ph lateral where each phase inside the community serves 20 to 40 transformers-The storage unit will be installed on only one transformer-The manufacturer of this community energy storage unit is Furukawa Electric from Japan
5Transformer Load*
240/120V
*One possible combination
Circuit feed (7.2 kV)20-40 xfms.
Homes per transformer:Maximum: 11Mode: 8Minimum: 4Load Distribution by Phase
(Electric Vehicles)(Photovoltaic Arrays)Case Study* Modeling in progress
Center for Electromechanics
Simulation typePhasorStop time1 dayTime step1 minNum. of time steps1,536Run time10 s
Simulation ApproachGrow
Recorded Data Pool>100 homes being measured (load and generation)1 min. intervalsMeasurements start on different dates
24 hrs of data per CSV fileEveryday a new CSV file is created
(awaiting next data dump)-This chart shows a map of our recorded data pool-It shows how long we have measured the consumption and generation at each house for-It is important to note that not all measurement devices were installed the same day-Additionally, we collect data every day here in Austin, Texas10
Residential Load
Real Data
PV Generation
Real Data0.5 - 1 MW of distributed PV generation daily
EV Load
Mix of 120 V and 240 V charging > 4 PM
Transformers Throughput
Transformer UtilizationHigh PV/Load ratio causes reverse flowsCan increase or decrease xfm. utilizationAfterPVs and EVsBeforePVs and EVs
Change in Transformer LoadExample (blue areas):Usage before: 25 % (fwd. direction)Usage after: 5 % (reverse direction)Change: 20 %- or 0 means increase in utilizationNo changePVs produce 23% increaseEVs produce 2% increase
Lateral Power
0.5 MW reduction in real power demandEqual reactive power demandPower factor dropsAfterPVs and EVs
BeforePVs and EVsVarsWattsVAPFVarsWattsVAPFAs seen from here
Lateral CurrentDecrease in diurnal current unbalancePeak time unbalance unchanged
AfterPVs and EVsBeforePVs and EVsFrom hereDistribution Losses
Increase due to EVsXfm losses almost unchanged$45/day = $16k/yearAfterPVs and EVsBeforePVs and EVsReduction due to PVsConclusions
Center for Electromechanics
Simulation ModelWe have real data (1 m resolution )ConsumptionPV generationCan simulate entire smart grid (735 homes)Confidence in resultsTransformers Appear oversized alreadySome operate ~80%Can meet EV load (at Mueller community)Power flow is forwards and backwardsResidential Solar Panels (PVs)Inject power back into the gridInjection is uncontrolled and unbalancedReduce lateral and transformer power factorProvide voltage supportElectric Vehicles (Chevy Volts)Uncontrolled charging exacerbates peak demandElectrical impact appears small due to transformer sizing
Acknowledgements
QuestionsFabian [email protected]
Center for ElectromechanicsThe University of Texas at Austinutexas.edu/research/cem10100 Burnet Road, Austin, TX
Center for Electromechanics
