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Email:[email protected] Tele: 871 722 9522 Skype: todosolarmexico
Demonstration of PV system design
Using PVSYSTDr. Jeffery Lee Johnson
CTO Todo-Solar
Coahuila, Mexico
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Agenda
Resources
A review of the basic principles of Photovoltaic Engineering
What is PV Systemdesign?
Initial Project Assessment: Matching Kwh of consumption (energyneeded) to solar Kwh produced using an actual Case Study
Case Study in Design : A real time design demonstration using PVSYS
Comparison of predicted performance to actual performance
Special features of PVSYST, compatibility with other resources
TodoSolar and TodoSolarKids
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Resources
Doc Solstices Seasoned SentimentsThe question of the day that is on everybodys minds
Does Solar Energy have a future ?
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Resources
Doc Solstices Seasoned SentimentsThe question of the day that is on everybodys minds
Does Solar Energy have a future ?
Solar Energy is here and is here to stay
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BASIC PRINCIPLES OF
PHOTOVOLTAIC ENGINEERING
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Key Concepts and Equations
The mathematics of PV engineering relies mostly on a singleequation - The Schockley diode equation
Watts peak : The Power output of a panel under specific conditions
1000 W / m2 solar radiation normal (perpendicular to surface) at 25C and 1 atm.
A normalized quantity that is helpful but not useful and is confusing
Specific yieldThe PV designers best friend
Specific yield is the Kwh produced per KWp installed per day (Kwh/KW/day)
It is normalized quantity independent of total size of system
Specific yield depends on
Geographical location and climate (solar resource)
Installation and orientation
Design by matching components for optimum performance
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The Shockley Diode Equation(The physics of the P-N Junction)
KatmVVkTewhere
V
VI
kT
eVII
thermal
thermal
30026
1exp1exp 00
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A First Look at the Diode Equation
VVI
kTeVII
thermal
1exp1exp 00
BLUE CURVE
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Effect on diode equation
Photo-active materials
(semiconductors)
Photon
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The photovoltaic Equation and curve
0II I
PH
th
IVVII
1exp0 RED CURVE
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The Photodiode is at the heart of every opto-
electronic device including solar cells
Electr ical diode
Photodiodes Solar Cells
Lasers
Power = I x V
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The Solar Cell Isc and Voc
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Variation with Temperature and Irradiation
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1ln
0I
I
kT
qV
ph
OC
Variation of Isc and Voc with Radiation
Voc varies logarithmically
with illumination
ISC varies linearly in proportion with illumination
ISC d VOC i i i h
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ISC and VOC variation with
Temperature
Voc Is inversely proportional with
temperature
ISC varies little
with changes in
temperature
1ln
0I
I
kT
qV
ph
OC
1ln
0I
I
kT
qV
ph
OC
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Solar Cell Power
0
1exp
max
0
dV
dPV
VVIIVP
VIP
themal
L
0max dI
dPI
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Maximum Power point tracking
All modern inverters have MPPT capability that optimizes the power point for a
string or array of solar panels
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WHAT IS PV SYSTEM DESIGN?
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Panel and series characteristics
String is a series of panels with
predetermined current and
voltage output
V = V1 + V2+ Vn= Vi
I = I1 = I2= In
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Inverter characteristics
Inverters have input requirements
Number of DC inputs
Minimum/Maximum current
Minimum/Maximum Voltage
MPPT range of Voltage
M t hi th l ith i t i
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Matching the panels with inverter is
called String Sizing
M t hi th l ith i t i
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Matching the panels with inverter is
called String Sizing
Inverters have Output characteristics
Peak Power
Specific Yield
Grid connection compatibility
Annual Production of energy
Kwh
M t hi ll t t t th d i d
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Matching all components to generate the desired power
and energy output for a client is the called PV system
Design
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INITIAL PROJECT ANALYSISA CASE STUDY IN DETERMINING KWH NEEDED
C ll d f Cli
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Collect data from Client
Utility bill provides
consumption and prices for ayear
We know the precise
geographical location
A site visit provides:
the area available
orientation possibilities
shading issues
Grid connection
Electrical interface
We can now begin the design
U i ti d t ti t i i
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Needs 26,823 Kwh per year. Using a Specific yield of 4.5. this client
needs a minimum system of 16 KW
Using consumption needs to estimate sizing
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A CASE STUDY IN PV SYSTEM DESIGN
USING PVSYST
PV
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PVSYST Simulation Software
http://www.pvsyst.com/
http://www.pvsyst.com/http://www.pvsyst.com/7/28/2019 webinar 02 photovoltaics
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DEMO
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COMPARING PREDICTED WITH
ACTUAL PERFORMANCE
USING SYSTEM MONITORING
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SPECIAL FEATURES OF
PVSYST
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(Solar Energy m ade available to Everyo ne)
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lant=e40d994b-9238-4c84-818b-82c731316308&splang=en-US
Twitter: @TodoSolarKidsTwitter: @TodoSolar
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