PVsystemeng

PVsystemeng - S ustainable E nergy S cience and E...

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Unformatted text preview: 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 S ustainable E nergy S cience and E ngineering C enter Insolation in Tallahassee 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 S ustainable E nergy S cience and E ngineering C enter Module I-V Characteristics Voltage variation is much less than the current drop S ustainable E nergy S cience and E ngineering C enter Where n c is number of cells G is 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 .... A / o C I sc G ( ) = I sc ( ) at 1 kW / m 2 G V m = 0.8 V oc Effect of Temperature and Irradiance S ustainable E nergy S cience and E ngineering C enter It is the cell temperature when the module operates under the following conditions at open circuit: Usually between 42 - 46 o C Irradiance 800 W/m 2 Spectral distribution AM1.5 Cell temperature 20 o C Wind speed >1 m/s Normal Operating Cell Temperature (NOCT) S ustainable E nergy S cience and E ngineering C enter Solar Cell Temperature (during module operation) Where G is given in kW/m 2 , T c and T a are cell and ambient temperature respectively....
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PVsystemeng - S ustainable E nergy S cience and E...

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