Author
Violeta Holmes
Other affiliations: Durham University
Bio: Violeta Holmes is an academic researcher from University of Huddersfield. The author has contributed to research in topics: Photovoltaic system & Fault detection and isolation. The author has an hindex of 18, co-authored 71 publications receiving 1186 citations. Previous affiliations of Violeta Holmes include Durham University.
Papers
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TL;DR: In this paper, the development of two hot spot mitigation techniques is proposed using a simple and reliable method using the FLIR i5 thermal imaging camera. And the proposed techniques ensure a decrease in the shaded PV cell temperature; thus, there is an increase in PV output power.
Abstract: Hot spotting is a reliability problem in photovoltaic (PV) panels where a mismatched cell heats up significantly and degrades PV panel output-power performance. High PV cell temperature due to hot spotting can damage the cell encapsulate and lead to second breakdown, where both cause permanent damage to the PV panel. Therefore, the development of two hot-spot mitigation techniques is proposed using a simple and reliable method. PV hot spots in the examined PV system were inspected using the FLIR i5 thermal imaging camera. Multiple experiments have been tested during various environmental conditions, where the PV module $I - V$ curve was evaluated in each observed test to analyze the output-power performance before and after the activation of the proposed hot-spot mitigation techniques. One PV module affected by the hot spot was tested. The output power during high irradiance levels is increased to approximately 1.26 W after the activation of the first hot-spot mitigation technique. However, the second mitigation technique guarantees an increase in the power up to 3.97 W. An additional test has been examined during the partial shading condition. Both proposed techniques ensure a decrease in the shaded PV cell temperature; thus, there is an increase in PV output power.
54 citations
TL;DR: In this article, the authors presented the development of a novel technique that is used to enhance the detection of micro cracks in solar cells using the binary and discreet Fourier transform (DFT) image processing models.
48 citations
TL;DR: A fault detection algorithm based on the analysis of the theoretical curves which describe the behaviour of an existing grid-connected photovoltaic (GCPV) plant is proposed which can accurately detect different faults occurring in the PV system.
48 citations
TL;DR: In this paper, the design and development of two hot spot mitigation techniques using a simple, costless and reliable method was proposed using a FLIER i5 thermal imaging camera. But, the proposed techniques are not suitable for use in the case of photovoltaic (PV) panels.
42 citations
TL;DR: The examined PV modules which contain micro cracks shows large loss in the output power comparing with the theoretical output power predictions, where the maximum power loss is equal to 80.73%.
Abstract: This study analyses the impact of micro cracks on photovoltaic (PV) module output power performance and energy production. Electroluminescence imaging technique was used to detect micro cracks affecting PV modules. The experiment was carried out on ten different PV modules installed at the University of Huddersfield, United Kingdom. The examined PV modules which contain micro cracks shows large loss in the output power comparing with the theoretical output power predictions, where the maximum power loss is equal to 80.73%. LabVIEW software was used to simulate the theoretical output power of the examined PV modules under real time long term data measurements.
39 citations
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01 Jan 2016
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1,993 citations