Fotovoltaik panel hatalarının termal kamera ve UV led ile tespiti

In this thesis, hot spot failures, panel surface fractures, and yellowing problems on 40 Watt polycrystalline photovoltaic (PV) panel were analysed through indoor laboratory experiments and outdoor fieldwork. The outdoor field tests were performed with a 40 Watt PV panel on a clear and sunny day in the garden of Ortaköy Vocational School of Aksaray University. It is observed that the output power value of the panel decreases in the open circuit fault which was created by disconnecting the series-connected cells within the panel. In addition to the observed change in the power value, temperature increase value due to broken glass surfaces and disconnected cells on the panel was observed with a thermal camera. In the indoor laboratory experiments, artificial shading and yellowing parts detection studies were performed with UV LED and photodiode which is designed as a rectangular prism and placed at 45-degree angles. To perform these works on the photovoltaic (PV) panel, the user interface was developed and the graphical values of the manually scanned panel were plotted on the screen. Besides, colour changes on the PV panel were tried to be determined at different spectrum values. Blue, green, yellow and red LED have been used to do this. It is understood from the figure that the blue led spectrum is most effective method to obtain PV diagnosis. According to the results obtained, colour changes on the PV panel could not be obtained in colours other than blue. Additionally, common faults in PV systems which are shading situation, line to line faults, panel soiling problem, increasing resistance value problem between panels, problems caused by bird droppings or tree leaves and branches, and the effect of temperatures on the photovoltaic (PV) panels were simulated, analysed, and P-V and I-V graphics of the panels were drawn.