"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 8, 2018

contents of issue      DOI  10.30898/1684-1719.2018.8.14     full text in Russian (pdf)  

Measurement of thermal resistance of solar modules by modulation method


V. I. Smirnov1,2, V. A. Sergeev1,2, A. A. Gavrikov1

1 Ulyanovsk branch of Kotelnikov Institute of Radio-Engineering and Electronics of Russian Academy of Science, Goncharova 48/2, Ulyanovsk 432071, Russia

2 Ulyanovsk State Technical University, Severny Venets 32, Ulyanovsk, 432027, Russia


The paper is received on August 9, 2018


Abstract. The paper describes the modulation method of measuring the thermal impedance of solar cells. Subject to measurements was the 50-watt solar module from polycrystalline silica with the surface area 700 × 550 mm2, of idling 23.6 B and current by operation on loading 2,55 A. The measurements were performed using heating power varying harmonically and measuring a response - variable component of the junction temperature. Feature of the modulation method is the possibility of determination of the components of thermal resistance connected to construction features of the solar module. Determination of components of thermal resistance of the solar module is based on measurement and the subsequent analysis of dependence of thermal impedance on modulation frequency of the heating power. It is experimentally found out that the amplitude of the variable component of the junction temperature mostly does not depend on the value of the heating power. This is explained by «current crowding» ‒ the nonuniform distribution of the current through the junction and the formation of local regions of heating of the semiconductor of solar module. The formation of local regions of heating is confirmed by the experimentally detected thermal resistance component, which is due to the temperature difference between local heated regions and other part of semiconductor of solar cell. Formation of local hot regions was confirmed by a sharp thermal resistance decrease with an increase of the heating current.

Key words: thermal resistance, measurement, modulation method, solar module, current localization.


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For citation:
V. I. Smirnov, V. A. Sergeev, A. A. Gavrikov. Measurement of thermal resistance of solar modules by modulation method. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2018. No. 8. Available at http://jre.cplire.ru/jre/aug18/14/text.pdf

DOI  10.30898/1684-1719.2018.8.14