eesipv: electrochemical energy storage integrated photovoltaics eme 580 group 5: solar rebecca hott...
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EESiPV: Electrochemical Energy Storage integrated
Photovoltaics
EME 580 Group 5: SolarRebecca Hott
Mark LaBarberaJeff Rayl
Kuangyuan Zhang
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Problem Statement:
Design and evaluation of an integrated photovoltaic and electrochemical storage system for continuous, stable and sustainable grid-connected power generation; including life cycle assessment on economic, policy and environmental impacts."
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System Design Requirements:
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Final System Design:
Phoenix, Arizona:• BP 3235N – 22,100 panels 5.194MWdc peak• FS3 77.5 – 51,200 panels 3.968MWdc peak
Raleigh, North Carolina:• BP 3235N – 27,300 panels 6.416MWdc peak• FS3 77.5 – 48,000 panels 3.720MWdc peak
Buffalo, New York:• BP 3235N – 45,500 panels 10.693MWdc peak• FS3 77.5 – 60,800 panels 4.712MWdc peak
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System Results: pc-Si Monthly Average PV Generation
1 3 5 7 9 11 13 15 17 19 21 230
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Phoenix, AZ
Time (Hours)
Pow
er
(MW
)
1 3 5 7 9 11 13 15 17 19 21 230
1
2
3
4
5
6
Raleigh, NC
Time (Hours)
Pow
er
(MW
)
1 3 5 7 9 11 13 15 17 19 21 230123456789
Buffalo, NYJan
Feb
Mar
Apr
May
June
July
Aug
Sept
Oct
Nov
DecTime (Hours)
Pow
er
(MW
)
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System Results: CdTe Monthly Average PV Generation
1 2 3 4 5 6 7 8 9 1011121314151617181920212223240
1
2
3
4
5
6
Phoenix, AZ
Time (Hours)
Pow
er
(MW
)
1 3 5 7 9 11 13 15 17 19 21 230
0.51
1.52
2.53
3.54
4.55
Raleigh, NC
Time (Hours)
Pow
er
(MW
)
1 2 3 4 5 6 7 8 9 1011121314151617181920212223240
1
2
3
4
5
6
7
Buffalo, NYJanFebMarAprMayJuneJulyAugSeptOctNovDec
Time (Hours)
Pow
er
(MW
)
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System Results: pc-Si System Average Daily Energy
1 2 3 4 5 6 7 8 9 10 11 120.00
10.00
20.00
30.00
40.00
50.00
60.00
Phoenix, AZ
Month
Energ
y (
MW
h)
1 2 3 4 5 6 7 8 9 10 11 120.005.00
10.0015.0020.0025.0030.0035.0040.0045.0050.00
Raleigh, NC
Month
Energ
y (
MW
h)
1 2 3 4 5 6 7 8 9 10 11 120.00
10.0020.0030.0040.0050.0060.0070.0080.0090.00
100.00
Buffalo, NY
PV System PowerBattery to ECUPV to GridBattery to GridTotal To Load
Month
Energ
y (
MW
h)
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System Results: CdTe System Average Daily Energy
1 2 3 4 5 6 7 8 9 10 11 120.005.00
10.0015.0020.0025.0030.0035.0040.0045.00
Phoenix, AZ
Month
Energ
y (
MW
h)
1 2 3 4 5 6 7 8 9 10 11 120.005.00
10.0015.0020.0025.0030.0035.0040.0045.0050.00
Raleigh, NC
Month
Energ
y (
MW
h)
1 2 3 4 5 6 7 8 9 10 11 120.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
Buffalo, NY
PV System PowerBattery to ECUPV to GridBattery to GridTotal To Load
Month
Energ
y (
MW
h)
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Photovoltaic Generation Conclusions:
• Seasonal variations in the solar resource leads to difficult system sizing for a single yearly quantity of base-load generation; seasonal quantities for energy generation with a minimum of 1MWh continuous production
• Solar resource forecasting required for accurate energy generation predictions
o Phoenix (high irradiance): high summer temperatures cause performance losses (especially in CdTe system)
o Raleigh (medium irradiance): provides the most consistent year round energy
o Buffalo (low irradiance): low angle of incidence in winter months requires significantly oversized array for the summer
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Vanadium Redox Flow CellElectrolyte Composition
Thermal Redox Reaction
Thermal Redox Reaction
V+2(aq)
V+3(aq)
Charged 3.5 M H2SO4
Charged 3.5 M H2SO4
Discharged 0.5 M H2SO4
Positive Electrolyte 3.5 M [Vtotal]
Negative Electrolyte 3.5 M [Vtotal]
Discharged 2.5 M H2SO4
+ +
Reagents
• Separate positive and negative storage tanks
• Each 225,000 liters (HDPE)
• H2SO4 concentration 0.5-3.5
• H2SO4 & V2O5 are acute health risks
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Vanadium Redox Flow CellElectro-active Species
V+2(aq) V+3
(aq)
H+(membrane)
+ 2H2O
e-(circuit) + H3O+
(aq) +
H3O+(aq)
++ H2O + e-
(circuit)
VO2+ + H3O+
+ H+ + e- VO2+ + 2H2OH3O+ + V+2 V+3 + H2O + e-
VO2+ + V+2 +2 H3O+ VO+2 + V+3 + 3 H2O
ΔrG° = -117.7 kJ mol-1E°eq = 1.24 V
Charge
Discharge
Positive Half-Reaction
Negative Half-Reaction
Positive Half-Reaction
Negative Half-Reaction
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Vanadium Redox Flow CellProton Exchange Membrane
Porous Polyethylene Separator Protects Nafion from VO-2 ions
Nafion Proton Exchange Membrane
VO+2 + VO2+
3.5 M [V]total
0.5 – 3.5 M H2SO4
V+2 + V+3
3.5 M [V]total
0.5 – 3.5 M H2SO4
Carbon FeltElectrode
Polyethylene Separator
Nafion ionomer
Carbon FeltElectrode
575 square meters
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2 x 225,000 liter HDPE Tanks (indoor storage)4 meter tall 4.24 meter diameter
575 m2 active area total500 Cells x 1.15 m2 Series & Parallel stack switching
Electronically controlled switchingMaximize Efficiency by minimizing ΔV between input from
ECU+PV array and VRB Stack
Vanadium Redox Flow CellBalance of Plant
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Vanadium Redox Flow CellElectrochemical Performance
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Vanadium Redox Flow CellElectrochemical Performance
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Photovoltaic – Battery Integration
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Electricity pricing & tariffs
Pheonix, AZ
Raleigh, NC
Buffalo, NY
2.20%
2.70%
3.20%
3.70%
4.20%
price annual increase
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 20110
2
4
6
8
10
12
14
16
18
20
Recent 10 years Utility price vs. time
Pheonix, AZRaleigh, NCBuffalo, NY
Year
Cent
s/KW
h
2011 2016 2021 2026 2031 20360
10
20
30
40
50
60 Expected future utility price vs. time
Pheonix, AZRaleigh, NCBuffalo, NY
Years
Cents
/KW
h
Pheonix, AZ Raleigh, NC Buffalo, NY0123456789
FiT
Cent
s/KW
h
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Federal, State & Local incentives*by DSIRE
Pheonix, AZ Raleigh, NC Buffalo, NY
Renewable Energy Production Tax Credit *( below yearly number) Renewable Energy Tax Credit
NYSERDA - Clean Energy Business Growth and Development(max $200,000 incentive)
Renewable Energy Business Tax Incentives
Renewable Energy Equipment Manufacturer Tax Credit
NYSERDA - Renewable, Clean Energy, and Energy Efficient Product Manufacturing Incentive Program
Property Tax Assessment for Renewable Energy Equipment
Duke Energy - Standard Purchase Offer for RECs: Solar RECs: $30.00 per MWh
Residential Solar Tax Credit
Solar and Wind Equipment Sales Tax Exemption NC Energy Star Plus
NYSERDA - PV Incentive Program
Local Option - Solar, Wind & Biomass Energy Systems Exemption
Energy Equipment Property Tax Exemption
Progress Energy Carolinas SunSense Commercial PV Incentive Program: $0.18/kWh Residential Solar Sales Tax Exemption 100% exemption from state sales taxyear1 $0.04$/KWh
year2 $0.04$/KWhyear3 $0.035$/KWhyear4 $0.035$/KWhyear5 $0.03$/KWhyear6 $0.03$/KWhyear7 $0.02$/KWhyear 8 $0.02$/KWhyear 9 $0.01$/KWhyear10 $0.01$/KWh
Capital Cost For BP Panel @ Pheonix Landuse
PV Panel
Storage system
installation& construction
other
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Cost-benefit, sensitivity analysis(BP Panel)
0 5 10 15 20 25 30
-$20,000,000.00
-$15,000,000.00
-$10,000,000.00
-$5,000,000.00
$0.00
$5,000,000.00
$10,000,000.00
$15,000,000.00
$20,000,000.00NPV vs. Time @ Phoenix
No Benefit
10 years incentive
10 years+FiT
0 5 10 15 20 25 30
-$25,000,000.00
-$20,000,000.00
-$15,000,000.00
-$10,000,000.00
-$5,000,000.00
$0.00
$5,000,000.00
$10,000,000.00NPV vs. Time @ Raleigh
No Benefit
10 year incentive
10 year +FiT
0 5 10 15 20 25 30
-$40,000,000.00
-$20,000,000.00
$0.00
$20,000,000.00
$40,000,000.00
$60,000,000.00
$80,000,000.00NPV vs. Time @ Baffulo
No benefit
10 year incentive
10 year +FiT
0 5 10 15 20 25 30
-$20,000,000.00
-$15,000,000.00
-$10,000,000.00
-$5,000,000.00
$0.00
$5,000,000.00
$10,000,000.00
$15,000,000.00Interest Rate sensitivity@ Phoenix
5%
10%
15%
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Cost-benefit, sensitivity analysis(First Solar)
0 5 10 15 20 25 30
-$20,000,000.00
-$15,000,000.00
-$10,000,000.00
-$5,000,000.00
$0.00
$5,000,000.00
$10,000,000.00
$15,000,000.00
$20,000,000.00NPV vs. Time @ Phoenix
No Benefit
10 years incentive
10 years+FiT
0 5 10 15 20 25 30
-$20,000,000.00
-$15,000,000.00
-$10,000,000.00
-$5,000,000.00
$0.00
$5,000,000.00
$10,000,000.00
$15,000,000.00
NPV vs. Time @ Raleigh
No Benefit
10 years incentive
10 years +FiT
0 5 10 15 20 25 30
-$30,000,000.00
-$20,000,000.00
-$10,000,000.00
$0.00
$10,000,000.00
$20,000,000.00
$30,000,000.00
$40,000,000.00
$50,000,000.00
$60,000,000.00
NPV vs. Time @ Baffulo
No benefit
10 year incentive
10 years+FiT
0 5 10 15 20 25 30
-$20,000,000.00
-$15,000,000.00
-$10,000,000.00
-$5,000,000.00
$0.00
$5,000,000.00
$10,000,000.00
$15,000,000.00
Interest rate sensitivity
5%
10%
15%
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Carbon offsets Assuming that the solar energy is displacing an equivalent
amount of conventionally produced electricity from the local grid; For coal, 900 grams of CO2 is emitted to generate 1 KWh.
Based on our capital costs:
Phoenix BP
Phoenix FS
Raleigh BP
Raleigh FS
Buffalo BP
Buffalo FS
Methane Wind Average
Nuclear Average
0
5
10
15
20
25
30
Carbon Offset($/metric ton of CO2)
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Economic conclusion and Future speculation
Years to Break even
Phoenix,BP
Raleigh,BP
Buffalo, BP
Phoenix,FS
Raleigh,FS
Buffalo, FS
No Benefit 16 N 9 16 24 8
10 years incentive 14 N 8 13 17 7
10 years+FiT 12 17 7 11 14 6
By advantage of solar resource, Phoenix passes the Cost-Benefit test. For therelative high electricity price, the design in Buffalo is the most economical favorable, although with the least solar resource. Raleigh, in absence of abundant solar resource or higher price, could not pass C-B test without great incentive for BP Panel. In general, First Solar fits our design better than BP panel in three sites.
Future speculation:Electricity cost projectionsPotential incentiveCarbon offset Material scaring projections
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Life Cycle Assessment
This ‘’cradle to grave’’ evaluation was performed on the 3 main products involved in our EESiPV systemCdTe PV module, pc-Si PV module, and Vanadium
Redox Flow Cell
Standards for performing this assessment comply with the ISO 14000 series
Values from -4 (high benefit) to +4 (high impact) were assigned to the product’s impact on material resources, energy use, global warming and human health for each of the five phases
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CdTe PV Module
Material Acquisition: Cadmium is obtained by smelting zinc or lead ores
Cadmium is considered toxic, but extremely small amounts are used Tellurium is recovered during the electrolytic refining of copper This is an energy intensive phase Emissions are also greatest during this phase
Manufacturing Also an energy intensive phase with numerous air emissions
Transportation By large trucks; tailpipe emissions are associated with this phase
Use Produces energy Acidic/Basic solutions along with water for cleaning purposes
Disposal Parts of a PV module will both be disposed of in a landfill and recycled Cadmium poses a threat to human health and environmental conditions if disposed of in
a landfill
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CdTe PV Module
Material Acquisition
Manufacturing
Transportation Use Disposal
Material Resources
4 3 1 0 2
Energy Use
3 4 1 -4 2
Global Warming
3 2 1 0 1
Human Health
3 1 1 0 1
Column Total:
13 10 4 -4 6
Total: 29
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pc-Si PV Module
Material Acquisition: Silicon for wafer production is obtained in one of two ways
1 Off-grade from the semiconductor industry
2 Direct solar grade (SoG-Si) for photovoltiac-only purposes Silicon is not considered toxic This is an energy intensive phase Emissions are also greatest during this phase
Manufacturing Also energy intensive with numerous air emissions
Transportation By large trucks; tailpipe emissions are associated with this phase
Use Produces energy Acidic/Basic solutions along with water for cleaning purposes
Disposal Parts of a PV module will both be disposed of in a landfill and recycled
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pc-Si PV Module
Material Acquisition
Manufacturing
Transportation Use Disposal
Material Resources
4 3 1 0 2
Energy Use 4 4 2 -4 2
Global Warming
4 3 2 0 1
Human Health
2 2 1 0 0
Column Total:
14 12 6 -4 5
Total: 33
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Vanadium Redox Flow Cell
Material Acquisition: Vanadium can be extracted numerous ways such as from the mining or recovery of
petroleum residues H2SO4 can be obtained as waste from other industrial processes This is an energy intensive phase, but less energy is used to acquire materials and
manufacture these flow cells than lead-acid batteries
Manufacturing Is both an industrial and on-site issue
Transportation By large trucks; tailpipe emissions are associated with this phase
Use Vanadium Oxide (V2O5) is a toxic and harmful chemical. It possess irritant properties and is
dangerous to the environment. It has a NFPA 704 Health Value of 3.
Disposal The cell is disassembled after operation and materials are either re-used or deposited in a
landfill Studies have been completed where 50 percent of the materials are allocated to re-use
and 50 percent are allocated to hazardous waste and landfill disposal
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Vanadium Redox Flow Cell
Material Acquisition
Manufacturing Transportation Use Disposal
Material Resources
2 2 1 3 1
Energy Use
3 4 2 0 1
Global Warming
2 3 2 0 2
Human Health
4 3 2 3 3
Column Total:
11 12 7 6 7
Total:
43
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Questions?
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Reference US Energy Information Administration(http://www.eia.gov/)-Electricity price(2001-2010)
Carbonfund.org for Carbon offset
DSIRE(Database of State Incentives for Renewable Energy) for Federal, State & Local incentives
Ecobusinesslinks.com for BP and First Solar PV price
Fthenakis, V. M. & Kim, H. C. "CdTe photovoltaics: Life Cycle environmental profile and comparisons” Science Direct: Thin Solid Films, 2007, 515, 5961-5963
Fthenakis, V. M.; Kim, H. C. & Alsema, E. "Emissions from Photovoltaic Life Cycles” Environmental Science & Technology, 2008, 42, 2168-2174
Lankey, R. L. & McMichael, F. C. "Life Cycle Methods for Comparing Primary and Rechargeable Batteries” Environmental Science & Technology, 2000, 34, 2299-2304
Raugei, M.; Bargili, S. & Ulgiati, S. "Life cycle assessment and energy pay-back time of advanced photovoltaic modules: CdTe and CIS compared to poly-Si Science Direct: Energy, 2007, 32, 1310-1318
Rydh, Carl J. “Environmental assessment of vanadium redox and lead-acid batteries for stationary energy storage” Journal of Power Sources, 1999, 80, 21-29
Jugnbluth, Niels. “Life Cycle Assessment of Crystalline Photovoltaics in the Swiss ecoinvent Database” Progress in Photovoltaics: Research and Applications, 2005, 13, 429-446