EML4930L5

EML4930L5 - Sustainable Energy Science and Engineering...

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S ustainable E nergy S cience and E ngineering C enter Photovoltaic Systems Engineering Photovoltaic System Components: Photovoltaic generator: Photovoltaic modules which are interconnected to form a DC power producing unit, usually called an array. Power conditioning and control: Various electronic devices used to accommodate the variable nature of power output from the PV generator; e.g. to convert the DC power into AC output Storage system: Stand-alone PV systems make provision for energy storage; e.g. battery storage Sources: Solar Electricity, Edited by Tomas Markvart, Wiley, 2000 Photovoltaic Systems Engineering, Roger Messenger & Jerry Ventre, CRC, 2000
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S ustainable E nergy S cience and E ngineering C enter PV Array For cells wired in series, their voltages at any given current add. A typical module will have 36 cells. Source: Renewable and efficient electric power systems by Gilbert M. Masters, Wiley Interscience, 2004.
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S ustainable E nergy S cience and E ngineering C enter Photovoltaic Module Typical 10 cm x 10 cm cell power: 1 - 1.5 W (under standard conditions) Supply voltage of a single cell: 0.5 - 0.6 V Standard conditions: Irradiance 1000 W/m 2 Spectral distribution AM1.5 Cell temperature 25 o C Module voltage is based on a number of cells ( typically 32 - 34) connected in a series (usually matched to the nominal voltage of the storage system) Typical module power: 40 - 60 W
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S ustainable E nergy S cience and E ngineering C enter For modules in series, at any given current, voltages add. For modules in parallel, at any given voltage, the currents add. Module Connectivity Source: Renewable and efficient electric power systems by Gilbert M. Masters, Wiley Interscience, 2004.
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S ustainable E nergy S cience and E ngineering C enter Array Arrangement Two ways to wire an array with three modules in series and two modules in parallel. Although, the I-V curves are the same, two strings of three modules each (a) is preferred. Source: Renewable and efficient electric power systems by Gilbert M. Masters, Wiley Interscience, 2004.
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S ustainable E nergy S cience and E ngineering C enter Module I-V Characteristics Voltage variation is much less than the current drop Temperature Effect
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ustainable E nergy S cience and E ngineering C enter Where n c is number of cells Gis in kW/m 2 V m is the voltage at the MPP dV oc dT =− 2.3 × n c ..... mV / o C dI sc dT = 6 × n c .... μ
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This note was uploaded on 10/22/2011 for the course ESC 2005 taught by Professor Staff during the Spring '11 term at FSU.

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EML4930L5 - Sustainable Energy Science and Engineering...

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