Nonstationary effects at photovoltaic module characterization using pulsed solar simulator

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Author list: Silsirivanich N., Chenvidhya D., Kirtikara K., Sriprapha K., Sritharathikhun J., Songprakorp R., Jivacate C.

Publisher: Springer

Publication year: 2015

Journal: Journal of Applied Spectroscopy (0021-9037)

Volume number: 82

Issue number: 2

Start page: 286

End page: 292

Number of pages: 7

ISSN: 0021-9037

eISSN: 1573-8647

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84943354032&doi=10.1007%2fs10812-015-0099-7&partnerID=40&md5=3e8d7e6fbcf88c41d744775598a5c45b

Languages: English-Great Britain (EN-GB)

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Abstract

This paper presents the dynamic characteristic of a tandem silicon/amorphous silicon (a-Si:H/a-Si:H) photovoltaic (PV) module measured in the nonstationary regime. The current-voltage (I—V) characteristics of the PV module are generally measured by using a pulsed solar simulator. Distortions of the I—V curves can often be observed when measurements are done under the solar simulator with different pulse durations or different sweeping rates of the curve tracing, a direction of the curve tracing from short circuit to open circuit (SCOC), or from open circuit to short circuit (OCSC). In this paper, the measurements were made on the a-Si:H/a-Si:H tandem PV module consisting of 40 cells in series connection. The PV module area is 0.78 m2. Dissimilarities of the I—V curves of the PV modules can be observed by the deviation ofpower at maximum point (Pm) and fill factor (FF). From the experimental results, it is found that the largest deviation of Pm is 6.12% for 1 ms sweeping duration with OCSC direction of the curve tracing. Dissimilarities of the I—V curves can be explained by charging and discharging capacitive currents due to a voltage dependence of solar cell parameters. Moreover, the capacitance effects can be described by a dynamic impedance measurement of the PV module in the dark with forward and reverse biasing. The voltage and time-dependent parameters are the diffusion capacitance (CD), transient or junction capacitance (CT), series resistance (Rs), and shunt resistance (Rsh),which can be revealed by an impedance plot. © 2015 Springer Science+Business Media New York.

Keywords

Dynamic characterization, Dynamic impedance, Nonstationary effects, Photovoltaic module, Pulsed solar simulator