DC DC-COUPL COUPLED ED SOLAR PLUS STORAGE DC-COUPLED SOLAR PLUS - - PowerPoint PPT Presentation

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 >25GW

LARGE ADDRESSABLE RETROFIT MARKET FOR ENERGY STORAGE

SOLAR PLUS STORAGE TOPOLOGIES

SOLAR PLUS STORAGE

AC-COUPLED & HYBRID AC AC-CO COUPLE LED

MPS

HYBRI YBRID D SOLAR LAR PLUS S STORA RAGE

SPS

VERMONT HAWAII

EXPERIENCE BUILDING AND DEPLOYING AC AND HYBRID SOLUTIONS LED TO CREATION OF DC-COUPLED

SOLAR PLUS STORAGE

OPTIONS

DC DC-COU OUPLE PLED

DPS FLORIDA

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

• f PV Plus Storage Power Plants. National Energy Renewable Laboratory

In all cases DC-Coupled Solar Plus Storage maximizes benefit cost ratio

DC-DC COST REDUCTION

20MW CASE STUDY REMOVE TRANSFORMERS 20 X $40,000 = $800,000 REMOVE SWITCHGEAR = $350,000 REMOVE AC COLLECTION SYSTEMS = $50,000

TOTAL AL SA SAVINGS VINGS: : $1 $1,200 ,200,000 ,000

LESS EQUIPMENT NEEDED WITH DC

Efficiency = 86.2% = .95 * .984 * .99 * .99 * .984 * .984 * .99

Ef

Efficienc ficiency y = = 89 89.2% .2%

= .95 * .982 * .982 * .984 * .99

HIGHER EFFICIENCY

DC DC-COU OUPLE PLED

• 3 power electronic conversions
• 1 battery charge and discharge
• 1 transformer conversion

AC AC-COU OUPLED PLED

• 3 power electronic conversions
• 1 battery charge and discharge
• 3 transformer conversions

Assumed efficiencies: PV inverter = 98.4%, Battery inverter = 97.5%, DC-DC = 98.2%, transformer = 99%, batteries = 95% round trip

52 52

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

• ntr

trol

• l Mod
• de

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)

• r may be required for PV on

weak feeders BENEFIT: CAN RECOVER LOST ENERGY ON RAMP UP

TYPICAL CONFIGURATION

But, what if we switched the positions….. STANDARD PV INVERTER

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 550-1500 VDC (power conversion up to 1425VDC) Max Continuous Power Rating 250kW and 375kW Max Continuous Current Rating +/-312.5 ADC Efficiency 98% CEC Multiple units can be paralleled to reach higher power ratings.

AD VA N TA G E S

• Patent-pending auto clipping recapture —

increases project revenues

• No constraints on voltage — providing you

with optimization flexibility

• Parallel up to 8 units together — giving you

flexible building blocks

• Integrated fusing and switchgear — saves

you money

• Can be paired with any solar inverter —

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 PVAC
• 28.7 MW PVDC
• 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

LOW E R C O S T H I G H E R E F F I C I E N C Y

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,

• r 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

Contacts

Chris Larsen

• Sr. Sales Engineer

clarsen@dynapower.com Chip Palombini ESG Sales Manager cpalombini@dynapower.com Robyn Pratt Sales Support rpratt@dynapower.com

THANK YOU

CONTACT