20.500.12556/DKUM-95614 Assessment of harmonic distortion in school buildings equipped with grid-connected PV systems Ocena harmonskega popačenja v šolskih stavbah s fotonapetostnimi sistemi The integration of photovoltaic systems into power grids can impact power quality, particularly concerning voltage and current harmonics. This study investigates the power quality of a photovoltaic system integrated into the electrical system of an educational facility, focusing on harmonic distortion in both voltage and current. Comprehensive measurements were conducted across three phases and analysed according to the EN 50160 and IEEE 519 Standards. The results demonstrated that, while the voltage quality meets EN 50160 requirements consistently, indicating stable voltage levels, the current measurements revealed significant harmonic distortion. Notably, Phase 2 exhibited Total Harmonic Distortion values substantially above the acceptable limits, with Phase 1 and Phase 3 also showing elevated Total Harmonic Distortion. To address these issues, the study recommends the implementation of advanced harmonic filters and optimisation of inverter technologies. These measures are crucial for enhancing power quality, and ensuring compliance with the industry Standards in high photovoltaic penetration scenarios. Integracija fotonapetostnih sistemov v elektroenergetska omrežja lahko vpliva na kakovost električne energije, zlasti glede napetostnih in tokovnih harmonikov. Ta študija obravnava kakovost električne energije v šolski stavbi z integriranim fotonapetostnimsistemom, s poudarkom na harmonskem popačenju napetosti in toka. Izvedene so bile obsežne meritve v vseh treh fazah, analiza pa je potekala v skladu s standardoma EN 50160 in IEEE 519. Rezultati kažejo, da kakovost napetosti dosledno izpolnjuje zahteve standarda EN 50160, kar potrjuje stabilne napetostne ravni, medtem ko meritve toka razkrivajo izrazito harmonsko popačenje. Posebej izstopa faza 2, kjer vrednosti celotnega harmonskega popačenja bistveno presegajo dovoljene meje, povišane vrednosti pa se pojavljajo tudi v fazi 1 in fazi 3. Za obvladovanje teh težav študija priporoča uporabo naprednih harmonskih filtrov in optimizacijo pretvornikov. Ti ukrepi so ključni za izboljšanje kakovosti električne energije in zagotavljanje skladnosti s strokovnimi standardi v scenarijih z visokim deležem obnovljivih virov energije. power quality analysis grid-connected PV systems EN 50160 standard IEEE 519 Standard IEC 61000 standard voltage harmonics current harmonics harmonic distortion renewable energy integration compliance assessment analiza kakovosti električne energije omrežno priključeni fotonapetostni sistemi standard EN 50160 standard IEEE 519 standard IEC 61000 napetostni harmoniki tokovni harmoniki harmonično popačenje integracija obnovljivih virov energije ocena skladnosti true true false Angleški jezik Slovenski jezik Članek v reviji 2025-10-01 10:03:22 2025-10-01 10:03:28 2025-10-02 03:10:48 0000-00-00 00:00:00 2025 0 0 str. [99]-122 št. 2 Letn. 18 sep. 2025 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 2025-09-01 621.383.51 250830339 10.18690/jet.18.2.99-122.2025 1855-5748 https://journals.um.si/index.php/jet/article/view/5413/3422 0 2ef01c76-9e9d-11f0-823e-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=199444 Fakulteta za energetiko Journal of energy technology 0 0 0