RELIABILITY ASSESSMENT OF PHOTOVOLTAIC MODULES WITH INITIAL DEGRADATION RANDOM CHARACTERISTICS

Yan Weian; Kong Wenqi; Liu Weidong; Xiong Yuhui; Zhang Jinjing

doi:10.19912/j.0254-0096.tynxb.2020-0679

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (3) : 152-157. DOI: 10.19912/j.0254-0096.tynxb.2020-0679

RELIABILITY ASSESSMENT OF PHOTOVOLTAIC MODULES WITH INITIAL DEGRADATION RANDOM CHARACTERISTICS

Yan Weian^1,2, Kong Wenqi¹, Liu Weidong³, Xiong Yuhui⁴, Zhang Jinjing¹

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Abstract

Based on the inverse Gaussian process, considering the random characteristics of the initial degradation, the performance degradation model of PV modules are established and its reliability is evaluated. First of all, the failure mechanism analysis shows that the degradation process of photovoltaic modules is mainly manifested as the attenuation of output power, which has monotonous and random characteristics, and the initial degradation also has random characteristics, so as to establish the inverse Gaussian performance degradation model with time shift of photovoltaic modules. Then, based on the maximum likelihood estimation method, the model parameters and reliability functions are estimated. Finally, based on the model, an example of photovoltaic module degradation is analyzed, and compared with the traditional inverse Gaussian degradation model, the results show that the model can describe the degradation law of photovoltaic modules more accurately, and the reliability estimation results are more in line with the reality.

Key words

reliability / photovoltaic module / degradation / inverse Gaussian process / random initial degradation

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Yan Weian, Kong Wenqi, Liu Weidong, Xiong Yuhui, Zhang Jinjing. RELIABILITY ASSESSMENT OF PHOTOVOLTAIC MODULES WITH INITIAL DEGRADATION RANDOM CHARACTERISTICS[J]. Acta Energiae Solaris Sinica. 2022, 43(3): 152-157 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0679

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