DC DC-COUPL COUPLED ED SOLAR PLUS STORAGE
DC-COUPLED SOLAR PLUS STORAGE DC Coupling enables the addition of storage to new, or existing, utility-scale solar to increase project revenues.
UTILITY-SCALE PV INSTALLATIONS >25 >25 GW LARGE ADDRESSABLE RETROFIT MARKET FOR ENERGY STORAGE
SOLAR PLUS STORAGE TOPOLOGIES
SOLAR PLUS STORAGE AC-COUPLED & HYBRID AC AC-CO COUPLE LED MPS HAWAII HYBRI YBRID D SOLAR LAR PLUS S STORA RAGE SPS VERMONT EXPERIENCE BUILDING AND DEPLOYING AC AND HYBRID SOLUTIONS LED TO CREATION OF DC-COUPLED
SOLAR PLUS STORAGE OPTIONS DC DC-COU OUPLE PLED FLORIDA DPS WE ARE FIRST TO MARKET AND HAVE INSTALLED PILOT PROJECTS WITH TWO OF THE NATION’S BIGGEST IPPS
SOLAR PLUS STORAGE VALUE STREAMS • Capacity Firming Make solar a dispatchable asset . • Energy Time Shifting The duck curve • Ramp Rate Control Up and down DC DC-COU OUPLE PLED SOL SOLAR PL PLUS ST US STORA ORAGE GE EN ENABLES LES BE T TE R P ROJECT E CONOMICS • Lower Cost than AC-Coupled • A Higher Efficiency than AC-Coupled Storage • Increased Revenue Due to Clipping Recapture • Ability to Retain Tax Incentives • Low Voltage Harvest (LVH) • Ramp Rate Control + • Should Be No Need for System Impact Study
COMPARATIVE VALUE — ADVANTAGE DC In all cases DC-Coupled Solar Plus Storage maximizes benefit cost ratio Citation: Denholm, P. Eichman, J., Margolis, R., Evaluating the Technical and Economic Performance of PV Plus Storage Power Plants. National Energy Renewable Laboratory https://www.nrel.gov/docs/fy17osti/68737.pdf
DC-DC COST REDUCTION 20MW CASE STUDY REMOVE AC COLLECTION SYSTEMS = $50,000 REMOVE TRANSFORMERS 20 X $40,000 = $800,000 REMOVE SWITCHGEAR = $350,000 TOTAL AL SA SAVINGS VINGS: : $1 $1,200 ,200,000 ,000 LESS EQUIPMENT NEEDED WITH DC
HIGHER EFFICIENCY 52 52 DC DC-COU OUPLE PLED AC-COU AC OUPLED PLED • • 3 power electronic conversions 3 power electronic conversions • • 1 battery charge and discharge 1 battery charge and discharge • • 1 transformer conversion 3 transformer conversions Ef Efficienc ficiency y = = 89 89.2% .2% Efficiency = 86.2% = .95 * .982 * .982 * .984 * .99 = .95 * .984 * .99 * .99 * .984 * .984 * .99 Assumed efficiencies: PV inverter = 98.4%, Battery inverter = 97.5%, DC-DC = 98.2%, transformer = 99%, batteries = 95% round trip
CLIPPING RECAPTURE ONLY WITH DC-COUPLED SAMPLE 20 MW PV INSTALLATION INVERTER RATIO: 1.45 ANNUAL LOST PRODUCTION: 1,92 1,923,25 3,256 kWh ADDITIONAL REVENUES AVAILABLE WITH CLIPPING RECAPTURE
MPPT AV A I L A B L E D C P O W E R v s . A C T U A L A C O U T P U T P E R C E N T L O S S — P V - O N L Y B A S E L I N E
MPPT WITH DPS-250 STORAGE NOT SIZED TO CAPTURE ALL OF THE CLIPPING — SOME HARVEST ERROR AT HIGH RADIANCE WHEN NOT…
LOW VOLTAGE HARVEST (LVH) ONLY WITH DC-COUPLED PV inverters harvest DC input when the array or string voltage is above a certain threshold. This impacts generation at beginning of day, end of day and in heavy cloud cover. HARVEST ENERGY ON THE EDGES
RAMP RATE CONTROL+ ONLY WITH DC-COUPLED Ramp amp Rate te Con ontr trol ol Mod ode e • System can be sized to provide ramp rate control to a defined spec: X MW/minute. • Required in island scenarios (Hawai’i, Puerto Rico, Caymans) or may be required for PV on weak feeders BENEFIT: CAN RECOVER LOST ENERGY ON RAMP UP
TYPICAL CONFIGURATION STANDARD PV INVERTER But, what if we switched the positions…..
REVERSE CONFIGURATION CHARGE FROM THE GRID Bi-directional storage inverter This configuration allows the system to charge and discharge from the grid while maintaining the benefits of DC coupling.
DC TO DC CONVERTERS DPS-250 and DPS-375 DC Input Voltage Range Both Ports AD VA N TA G E S 550-1500 V DC (power conversion up to 1425V DC ) Max Continuous Power Rating • Patent -pending auto clipping recapture — 250kW and 375kW increases project revenues • No constraints on voltage — providing you Max Continuous Current Rating +/-312.5 ADC with optimization flexibility • Parallel up to 8 units together — giving you Efficiency flexible building blocks 98% CEC • Integrated fusing and switchgear — saves you money Multiple units can be paralleled • Can be paired with any solar inverter — to reach higher power ratings. works with your existing equipment and supply chain
SPECIFICATION SYSTEM ARCHITECTURE On-board controller in converter communicates directly with the battery BMS DPS-250 or DPS-375
SIMPLIFIED DC-COUPLED INTEGRATION DC RECOMBINER NOT ALWAYS NECESSARY
DC-COUPLED CASE STUDY: 20MW OVERALL SYSTEM • 20.0 MW PV AC • 28.7 MW PV DC • 1.435 : 1 DC:AC ratio • 20x 1MVA PV inverters PROPOSED STORAGE DC-Coupled • 15MW / 2hr • 3x DPS-250 per inverter = 15MW battery • 500kWh behind each DPC-250
MIDWEST USA INSTALLATION CASE STUDY Proposed Mechanical layout
MIDWEST USA INSTALLATION CASE STUDY Proposed Mechanical layout detail DC-DC converter
DC-COUPLED SOLAR PLUS STORAGE BENEFITS SUMMARY H I G H E R E F F I C I E N C Y LOW E R C O S T 89 89.2% .2% G R E AT E R R E V E N U E S TA X A DVA N TAG E S A P P L I C A B L E T O N E W & E X I S T I N G S O L A R I N S TA L L AT I O N S
SOLAR + STORAGE CALCULATOR LET US MODEL YOUR PROJECT SE SEE IF E IF DC DC-CO COUPL UPLED ED IS IS RIGHT RIGHT FOR FOR YOUR OUR PR PROJECT OJECT FREE OF CHARGE Dynapower can model your PV installation for energy storage opportunities to see if the DC-coupled approach is the best economic solution to adding solar plus storage for your installation, or if AC-Coupled or Hybrid solutions would be best. What we need: • PV DC kW • INVERTER AC kW Rating • Project Location • Tilt and Azimuth • PPA Value Including TOD Variations LET US MODEL YOUR PROJECT
THANK YOU CONTACT Contacts Chris Larsen Sr. Sales Engineer clarsen@dynapower.com Chip Palombini ESG Sales Manager cpalombini@dynapower.com Robyn Pratt Sales Support rpratt@dynapower.com
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