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Research Papers

Photovoltaic Maximum Power Point Varying with Illumination and Temperature

[+] Author and Article Information
E. Radziemska

 Gdansk University of Technology, Chemical Faculty, ul. G. Narutowicza 11∕12, 80-952 Gdańsk, Polandewarad@chem.pg.gda.pl

E. Klugmann

 Gdansk University of Technology, Chemical Faculty, ul. G. Narutowicza 11∕12, 80-952 Gdańsk, Poland

J. Sol. Energy Eng 128(1), 34-39 (Jan 24, 2005) (6 pages) doi:10.1115/1.2147586 History: Received May 06, 2004; Revised January 24, 2005

This paper presents the experimental results and discusses the track of the maximum power point on the current-voltage curve of a PV module due to changes of the illumination level and temperature. A time decrease of the voltage and simultaneous temperature increase during the initial stage of irradiation has been observed. Some practical implementation aspects of a maximum power point tracking unit, which match the current and voltage characteristics of the load to the PV module’s maximum power point automatically, are also discussed. A linear decrease of the maximum output power Pm with temperature increase has been observed and the temperature coefficient was derivate. Temperature coefficients for Voc, Isc, Vmpp, Impp, and ηPV have been determined for the photovoltaic module. Also the radiation-rate coefficient at constant temperature has been calculated.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

The experimental stand for the silicon solar cell measurements schematic diagram

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Figure 2

The experimental stand for the solar module type ASE-100-DGL-SM testing

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Figure 3

Current-Voltage output curve of the Astro Power AP-110 module under the standard test conditions (STC): Irradiance of 1000W∕m2 and cell temperature of 25°C

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Figure 4

Current-Voltage characteristic I–V and output power versus voltage P(V) of the ASE-100-DGL-SM module measured under the STC

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Figure 5

Current-Voltage output curves of a typical single crystal silicon PV cell of 100cm2 at different light intensities

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Figure 6

Current-Voltage characteristics of the ASE-100-DGL-SM module measured at 25°C, 60°C and irradiance level of 840W∕m2

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Figure 7

Output power vs voltage of a single-crystalline silicon (103mm×103mm) solar cell at various temperatures: 28°C, 40°C, 60°C, 80°C, and at irradiance 830W∕m2

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Figure 8

Temperature dependence of the maximum output power Pm(T) drawn on the basis of Fig. 7

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Figure 9

Block diagram of the stand alone PV system with the dc bus and computer controlled flow of energy (14)

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Figure 10

Current-Voltage curves of the PV modules (solar array) at different values of the solar irradiation. The maximum power points of the solar array are designed as Array MPP. The label “device MPP” refers to the point of power selected for the dc-dc converter at any solar irradiance (13).

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Figure 11

The MPPT system, consisted of three main subsystems (10)

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Figure 12

The PV module voltage dynamic response after switching on the incident radiation of 1000W∕m2(14)

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Figure 13

The single-crystalline silicon solar cell temperature versus illumination time after switching on the irradiance of 756W∕m2

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