Performance analysis of upgraded university building of FERIT Osijek microgrid achieving nearly zero energy standard based on real measurement data

Nearly zero energy buildings (nZEB) are buildings with high energy performance and nearly zero or very small amount of required energy. Energy production of an nZEB is based on only renewable energy sources (RES), on-site or nearby. Nearly zero energy standard represent the solution for better energy efficiency, conservation and saving. In this work, proposal of upgrade of the existing production system with goal of achieving the nearly zero energy standard of the Faculty of Electrical Engineering, Computer Science and Information Technology (FERIT) building in Osijek, Croatia is given. Measurement database developed in Laboratory for Renewable Energy Sources consists of measurements of meteorological data recorded at the micro-location of FERIT building, electrical output of the 10 kWp photovoltaic (PV) system and total electricity consumption of the FERIT Osijek building. Simulations for four different structures of microgrid (MG) are conducted and performance analysis based on results is obtained. Main goal of the proposed MG is to achieve nearly zero energy standard based on cost-benefit analysis of different proposed cases. In the final part of paper, comparison of results with conclusions are presented.