1061 KB0 KB201320252025Pranjić, Franjoletnik:18številka:2str. 99-122DOI:10.18690/jet.18.2.99-122.2025ISSN:1855-5748COBISSID_HOST:250830339URN:URN:NBN:SI:doc-J3TX890PenFakulteta za energetikoUniversity of Maribor, University of Maribor PressJournal of energy technologyanaliza kakovosti električne energijecompliance assessmentcurrent harmonicsEN 50160 standardgrid-connected PV systemsharmonic distortionharmonično popačenjeIEC 61000 standardIEEE 519 Standardintegracija obnovljivih virov energijenapetostni harmonikiocena skladnostiomrežno priključeni fotonapetostni sistemipower quality analysisrenewable energy integrationstandard EN 50160standard IEC 61000standard IEEE 519tokovni harmonikivoltage harmonicsAssessment of harmonic distortion in school buildings equipped with grid-connected PV systems|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 scenariosIntegracija 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 energijeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Mariboru, Fakulteta za energetiko