Experimental study of PV strings affected by cracks

Tian, Cuihua; Al-Soeidat, Mohammad; Lu, Dylan Dah-Chuan; Agelidis, Vassilios G.

doi:10.1049/joe.2018.9320

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…Due to the long-term outdoor exposure, solar panels are subject to the mutual impact of the temperature difference between daytime and night, wind, and snow erosion and other harsh environments, which will inevitably cause defects such as cracks, fragments, and grid breaks [1]. These defects will reduce the efficiency of photovoltaic conversion and the service life of solar panels [2,3]. Therefore, it is important to accurately extract these defects during the manufacture and use of solar panels.…”

Section: Introductionmentioning

confidence: 99%

Crack Extraction for Polycrystalline Solar Panels

Xue

Song

et al. 2021

Energies

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Crack extraction of solar panels has become a research focus in recent years. The cracks are small and hidden. In addition, there are particles of irregular shape and size on the surface of the polycrystalline solar panel, whose reflection position and direction are random. Therefore, there is a complex and uneven texture background on the solar panel image, which makes the crack extraction more difficult. In this paper, a crack extraction method combining image texture and morphological features is proposed. Firstly, the background texture and multi-scale details are suppressed by the linear filter and the Laplace pyramid decomposition method. Secondly, the edge can be extracted based on the modulus maximum method of the wavelet transform. Finally, cracks were extracted by using the improved Fuzzy C-means (FCM) clustering combining the morphological and texture features of the cracks. To make the extraction results more accurate and reasonable, an improved region growth algorithm is proposed to optimize the extraction results. All of the above research is closely centered on the accuracy and stability requirements of the solar cell crack detection, which is also the key point of this paper. The experimental results show that various improved or innovative algorithms proposed in this paper can accurately extract the position of cracks and obtain better extraction results. The detection results have good stability and can be faithful to the actual situation, which will promote the application of solar cells in more fields.

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Section: Introductionmentioning

confidence: 99%

Crack Extraction for Polycrystalline Solar Panels

Xue

Song

et al. 2021

Energies

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“…The panel with efficiency at 80.73% indicates that it is approaching its end-of-life, which is much shorter than the expected long lifespan. Based on this concern, the micro-cracks failure mechanisms and impact are reviewed in [3,[5][6][7][8][9][10]. The cracks are most likely generated during the manufacturing, transportation and installation stages, and the mechanical stress such as snow loads could increase the possibility to develop a larger crack [5].…”

Section: Introductionmentioning

confidence: 99%

“…The aforementioned research reviewed the failure mechanism, detrimental effects, criticality, and potential risks of cracks on PV panels. The evaluations in most of the above work in [3,[5][6][7][8][9][10] are through using the I-V and P-V curves to indicate the output power generation capability, which is the static behaviour of PV panels. An alternative is to use impedance spectroscopy [11][12][13][14][15], which reflects the dynamic behaviour of a cracked PV panel.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of static and dynamic behaviours of cracked PV panels

Al-Soeidat

Tian

et al. 2019

IET Renewable Power Generation

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Solar cell power performance is greatly affected by two critical factors ageing and crack. In order to mitigate their negative effects on the solar system, these cells are to be substituted by new cells, thus, replacing the panels. This study presents an active crack detection method that detects the cracked cells within a solar string by using AC parameter characterisation without a need to have a physical inspection. The mathematical module of the solar cell shows that it constitutes of series and parallel resistors in addition to a parallel capacitor and that their values change by ageing and crack. In addition to studying the effects of the crack on the solar cell, it is verified by the experiment that the solar cells behave as a capacitive circuit, and their capacitance increases when the cell gets cracked, getting higher as the crack becomes more serious. The experiment is extended to investigate the effect of series and parallel PV strings, which are affected by cracked and partially shaded cells to evaluate their criticality levels. By monitoring the AC parameter of the solar cell and the change of the capacitance, it is easy to detect the crack when it occurs.

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“…Significant time and money have been dedicated to improving the solar cell conversion efficiency from 10% to 40%. Similarly, a lot of researchers trying to enhance the efficiency by reducing mismatch loss [15], mechanical failure loss [16], irradiance effect, incident angle effect, temperature effect and load effect, etc. By using different MPPT strategies like BPSO fuzzy P&O controller [17], Modified-Perturb & Observe (MP&O) [18], Adaptive fixed duty cycle algorithm [19], ANFIS MPPT approach [20], GMPPT algorithm [21], FL based MPPT algorithm [22] and FOPI controller [23,24], the impact of load effect in the solar panel is addressed.…”

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confidence: 99%

Dust Deposition’s Effect on Solar Photovoltaic Module Performance: An Experimental Study in India’s Tropical Region

Lakshmi¹,

Ramadas²

2022

Journal of Renewable Materials

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A solar PV panel works with maximum efficiency only when it is operated around its optimum operating point or maximum power point. Unfortunately, the performance of the solar cell is affected by several factors like sun direction, solar irradiance, dust accumulation, module temperature, as well as the load on the system. Dust deposition is one of the most prominent factors that influence the performance of solar panels. Because the solar panel is exposed to the atmosphere, dust will accumulate on its surface, reducing the quantity of sunlight reaching the solar cell and diminishing output. In the proposed work, a detailed investigation of the performance of solar PV modules is carried out under the tropical climatic condition of Chennai, India, where the presence of dust particles is very high. The data corresponding to four different dust samples of various densities at four solar irradiation levels of 220, 525, 702, and 905 W/m 2 are collected, and performance analysis is carried out. Based on the analysis carried out, the maximum power loss is found to be 73.51%, 66.29%, 65.46%, and 61.42%, for coal, sand, brick powder, and chalk dust respectively. Hence, it can be said that coal dust contributes to the maximum power loss among all four dust samples. Due to heat dissipation produced by dust deposition, the performance of solar PV modules is degraded as the temperature rose.

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Experimental study of PV strings affected by cracks

Cited by 6 publications

References 5 publications

Crack Extraction for Polycrystalline Solar Panels

Crack Extraction for Polycrystalline Solar Panels

Experimental study of static and dynamic behaviours of cracked PV panels

Dust Deposition’s Effect on Solar Photovoltaic Module Performance: An Experimental Study in India’s Tropical Region

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