Wednesday, July 24, 2024

DEWA unveils new methodology to measure current-voltage curves in PV techniques – pv journal Worldwide


A bunch of scientists from a UAE-based power utility has developed a brand new methodology to conduct IV curve measurements with out transporting photo voltaic modules to laboratories for detailed evaluation. The proposed Suns-Vmp methodology is reported to supply a “very low” common root imply sq. error between simulated and actual IV curves.

“It was once apply within the PV trade to watch the well being of PV techniques utilizing their current-voltage (IV) curves. However, these IV curves are not often measured within the discipline, requiring the modules will likely be delivered to laboratories for detailed evaluation,” the corresponding creator of the analysis, Shahzada Pamir, stated. pv journal. “This course of disrupts the conventional operation of the PV system and dangers bodily injury to the modules throughout transportation. To deal with this problem, we developed a physics-based statistical mannequin generally known as the Suns method- Vmp.

The proposed methodology is described as a non-destructive, non-intrusive, and non-interruptive method that makes use of voltage at most energy (Vmp) and present at most energy (Imp) together with irradiance and module temperature to create altering the ‘pseudo’ I– V curve. These pseudo IV curves are then fitted to an acceptable equal electrical circuit mannequin, particularly a two-diode mannequin.

The novel methodology additionally assumes the monotonic degradation of PV parameters over time. “The temporal evolution of those PV parameters supplies not solely the general degradation of the PV module but additionally highlights the underlying components,” defined Pamir.

The scientists carried out a collection of assessments on the brand new methodology by measuring 10 completely different PV modules put in at DEWA’s Outdoor Test Facility close to the Mohammed bin Rashid Al Maktoum (MBR) photo voltaic park, they usually claimed that this evaluation exhibits the accuracy of the Suns-Vmp methodology. to breed pseudo I–V curves in comparison with precise field-measured I–V curves.

“From our evaluation of 110 PV modules put in beneath excessive desert situations, the median energy degradation charges for mono-crystalline, poly-crystalline, and thin-film applied sciences had been estimated at approx. which is 0.21% per yr, 0.49% per yr, and 1.51% per yr, respectively,” stated Pamir, including that the panels had been deployed with completely different angles of inclination and submitted to completely different cleansing frequencies.

The Suns-Vmp methodology was additionally discovered to supply a “very low” common root imply sq. error (RMSE) of 0.35 A between the simulated and the actual IV curves. “A significant drawback of the Suns-Vmp methodology in its present type is that it can’t reproduce the IV curves for partially shaded modules, which have IV curves with steps or kinks,” the lecturers saying. “This is as a result of the PV parameters obtained by the Suns-Vmp methodology symbolize all the module.”

“This research is the primary of its type to investigate the degradation pathways of PV modules beneath the tough situations of the Dubai desert utilizing precise PV modules,” added Pamir. “The findings present an essential baseline for real-time monitoring and complementing direct measurements, providing new insights into the widespread degradation modes of several types of The in depth validation of the Suns-Vmp methodology not solely highlights its sensible software but additionally improves our understanding of the module’s efficiency in desert climates.

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