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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

    mailto:[email protected]:[email protected]
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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/
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    DEMO

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    COMPARING PREDICTED WITH

    ACTUAL PERFORMANCE

    USING SYSTEM MONITORING

    http://www.sma-america.com/en_US.htmlhttp://www.sma-america.com/en_US.htmlhttp://www.sma-america.com/en_US.html
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    SPECIAL FEATURES OF

    PVSYST

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    (Solar Energy m ade available to Everyo ne)

    http://www.sunnyportal.com/Templates/PublicPageOverview.aspx?p

    lant=e40d994b-9238-4c84-818b-82c731316308&splang=en-US

    Twitter: @TodoSolarKidsTwitter: @TodoSolar

    http://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-UShttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-UShttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-UShttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-UShttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-UShttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-UShttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-UShttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-UShttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-UShttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-UShttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-UShttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-UShttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-UShttp://www.sunnyportal.com/Templates/PublicPageOverview.aspx?plant=e40d994b-9238-4c84-818b-82c731316308&splang=en-US