ANALYSIS OF HOT SPOT FAULT CHARACTERISTICS OF PHOTOVOLTAIC MODULES BASED ON I-V OUTPUT CHARACTERISTICS AND MODEL PARAMETERS

Weng Kai; Wei Dong; Wang Chongxi; Zhang Jinbo

doi:10.19912/j.0254-0096.tynxb.2025-0511

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (8) : 153-160. DOI: 10.19912/j.0254-0096.tynxb.2025-0511

ANALYSIS OF HOT SPOT FAULT CHARACTERISTICS OF PHOTOVOLTAIC MODULES BASED ON I-V OUTPUT CHARACTERISTICS AND MODEL PARAMETERS

Weng Kai¹, Wei Dong², Wang Chongxi¹, Zhang Jinbo¹

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Abstract

For photovoltaic modules with early hot spots （power loss less than 25%）, analyze the evolution mechanisms of occlusions, crystal defects and hidden crack type hot spot faults, establish the equivalent circuit model of the module, and utilize the I-V characteristic data obtained through detection. By calculating the key characteristic quantities （slope at short-circuit current/slope at open-circuit voltage, current at turning point） and model parameters （photogenerated current, series resistance and parallel resistance） of the I-V characteristic curves of different types of hot spots, the influence on the I-V characteristics are studied, and the difference laws among the changes of model parameters of various types of hot spots are analyzed and obtained. And the parameter changes during the evolution process from latent cracking to latent cracking type hot spots are analyzed. The research results show that the key characteristic quantities of I-V characteristics and model parameters of different types of hot spot faults have relatively obvious differences in their variation patterns, which can initially achieve the distinction and determination of three types of hot spots, as well as hidden cracks and hidden crack-type hot spots.

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PV modules / current voltage characteristics / feature extraction / parameter calculation / hot spot faults

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Weng Kai, Wei Dong, Wang Chongxi, Zhang Jinbo. ANALYSIS OF HOT SPOT FAULT CHARACTERISTICS OF PHOTOVOLTAIC MODULES BASED ON I-V OUTPUT CHARACTERISTICS AND MODEL PARAMETERS[J]. Acta Energiae Solaris Sinica. 2026, 47(8): 153-160 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0511

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