ANALYSIS OF FAULT CHARACTERISTICS IN PHOTOVOLTAIC STRING BASED ON TIME SERIES AND I-V CHARACTERISTICS COMPARISON

Lu Ting; Guo Qian; Wei Dong; Wang Chongxi

doi:10.19912/j.0254-0096.tynxb.2024-1740

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (2) : 40-50. DOI: 10.19912/j.0254-0096.tynxb.2024-1740

ANALYSIS OF FAULT CHARACTERISTICS IN PHOTOVOLTAIC STRING BASED ON TIME SERIES AND I-V CHARACTERISTICS COMPARISON

Lu Ting¹, Guo Qian¹, Wei Dong², Wang Chongxi¹

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Abstract

Based on the equivalent circuit of solar cells, a model for the I-V output characteristics of photovoltaic strings is established. By using numerical solutions, a method for calculating the model parameters and maximum power point under any ambient temperature and irradiance is proposed. Furthermore, a time series output characteristics model of photovoltaic strings is developed. For faults such as aging, potential-induced degradation （PID）, micro-cracks, and hotspots, the differential change patterns under different types and degrees of faults are studied. According to the variation characteristics of the time series and global maximum power point curves, fault features are identified and extracted to distinguish fault types and describe fault severity. Simulation and experimental results show that the established model and proposed method can accurately fit the measured data. The calculated model parameters and global maximum power points under various irradiance levels and ambient temperatures exhibit distinct variation patterns. The proposed fault feature metrics can effectively differentiate fault types and describe changes in fault severity.

Key words

time series / maximum power point / current voltage characteristics / photovoltaic string

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Lu Ting, Guo Qian, Wei Dong, Wang Chongxi. ANALYSIS OF FAULT CHARACTERISTICS IN PHOTOVOLTAIC STRING BASED ON TIME SERIES AND I-V CHARACTERISTICS COMPARISON[J]. Acta Energiae Solaris Sinica. 2026, 47(2): 40-50 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1740

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