20.500.12556/RUL-177847 Improving IV curve measurement accuracy of high-efficiency PV modules using extrapolation based on a dual load capacitor scanning method With continuous progress in photovoltaic (PV) technology, the conversion efficiency of commercial PV modules is steadily increasing well above 20 %, even exceeding 24 %. Such high-efficiency (HE) PV modules typically exhibit long free-carrier lifetimes, resulting in high diffusion capacitances. For routine field testing, technicians rely on fast, affordable and portable IV curve scanners, which typically employ the load capacitor scanning method. When applied to HE PV modules with high internal capacitance, this method frequently leads to IV curve distortion, resulting in a significant underestimation of the measured maximum power point (MPP). In this paper, we propose a novel extrapolation technique that corrects the distortion of the measured IV curve through two consecutive IV scans using two different load capacitors. The extrapolation algorithm uses a dynamic electrical model of the whole system, including the PV module and the measurement setup, to compensate for the effect of the PV module’s capacitance on the acquired IV curve shape. It extracts two free parameters related to series resistance and the lifetime of the minority carriers that give the best match between the two extrapolated IV curves. We validated the method on four different state-of-the-art HE PV modules (HIT, TOPCon, IBC, and PERC), reliably reducing the MPP error from the initial up to 4 % to less than 1 %. difussion capacitance dynamic modelling high-efficiency PV modules IV curve extrapolation load capacitor IV scanning method measurement accuracy difuzijska kapacitivnost dinamično modeliranje visokoučinkoviti PV moduli ekstrapolacija IU krivulje metoda IU skeniranja z bremenskim kondenzatorjem merilna negotovost true false true Angleški jezik Slovenski jezik Članek v reviji 2026-01-09 13:31:06 2026-01-09 13:31:11 2026-01-10 04:27:53 0000-00-00 00:00:00 2025 0 0 Str. 214960-214970 Vol. 13 2025 0000-00-00 Zaloznikova Objavljeno apc 0000-00-00 0000-00-00 0000-00-00 621.38 2169-3536 10.1109/ACCESS.2025.3645420 262738179 Improving_IV_Curve_Measurement_Accuracy_of_High-Efficiency_PV_Modules_Using_Extrapolation_Based_on_a_Dual_Load_Capacitor_Scanning_Method.pdf Improving_IV_Curve_Measurement_Accuracy_of_High-Efficiency_PV_Modules_Using_Extrapolation_Based_on_a_Dual_Load_Capacitor_Scanning_Method.pdf 1 131CB5784234D8F1BAB38E2739A63720 7470c375ca317b06f1894e3d80cda9543d633ee6de7b45414daa2ede95cad13f 305b3fd1-ed57-11f0-bf92-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=225209 https://ieeexplore.ieee.org/document/11303069 1 12f444f1-ed57-11f0-bf92-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=225208 Fakulteta za elektrotehniko 0 0 0