1. Research on the modelling and analysis of the penetration of renewable sources and storage into electrical networksEva Simonič, Sebastijan Seme, Klemen Sredenšek, 2025, original scientific article Abstract: To address the growing integration of renewable energy sources and storage systems into distribution networks, there is a need for effective tools that can assess the impact of these technologies on grid performance. This paper investigates the impact of integrating residential rooftop photovoltaic (PV) systems and battery energy storage systems (BESSs) into low-voltage (LV) distribution networks. A stochastic approach, using the Monte Carlo method, is applied to randomly place PV systems across the network, generating multiple scenarios for power flow simulations in MATLAB Simulink R2024b. The method incorporates real-world consumer load data and grid topology, representing a novel approach in simulating distribution network behaviour accurately. The novelty of this paper lies in its ability to combine stochastic PV placement with real-world load data, providing a more realistic representation of network conditions. The simulation results revealed that widespread PV deployment can lead to overvoltage issues, but the integration of BESSs alongside PV systems mitigates these problems significantly. The findings of this paper offer valuable insights for Distribution Network Operators, aiding in the development of strategies for optimal PV and BESS integration to enhance grid performance.
Keywords: photovoltaic system, battery energy storage system, low-voltage distribution network, Monte Carlo method, power flow
Published in DKUM: 03.11.2025; Views: 0; Downloads: 5
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2. Engineering Materials and Process Technologies : 2nd Conference of Programme Groups of the Faculty of Mechanical Engineering University of Maribor, Book of Abstracts2025 Abstract: The publication presents an overview of the research achievements of Programm Groups of the Faculty of Mechanical Engineering: P2-0424 Design of Novel Properties of (Nano)Materials & Applications, P2-0063 Design of Cellular Structures, P2-0120 Technologies of Metastable Materials, P2-0118 Textile Chemistry and Advanced Textile Materials, and P2-0196 Research in Power, Process, and Environmental Engineering from 2024 to 2025. Members of the program group present their research innovations and progress achieved within the framework of the program group's activities.
Keywords: advanced textile materials, composites, nanomaterials, biotechnology, surface functionalization and modification, cellular structures, metastable materials, power, process and environmental engineering
Published in DKUM: 03.11.2025; Views: 0; Downloads: 0
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3. Razvoj aplikacije za upravljanje terminov v okolju Microsoft Power AppsAnita Eva Pogorelec, 2025, undergraduate thesis Abstract: Diplomska naloga obravnava razvoj aplikacije za upravljanje terminov v okolju Microsoft Power Apps, namenjene digitalizaciji internih rezervacijskih procesov znotraj organizacije. V uvodu je opredeljen problem ročnega upravljanja terminov, ki pogosto povzroča neučinkovitosti in napake. Cilj naloge je bil zasnovati nizkokodno rešitev, s katero se upravljanje izobraževanj, prijav ter obveščanja zaposlenih poenostavi in izboljša.
Dodana vrednost razvite aplikacije je v hitrejšem izvajanju prijavnih procesov ter v podpori nadaljnji digitalizaciji organizacijskih procesov.
Zaključki naloge izpostavljajo, da nizkokodni razvoj predstavlja ustrezno metodologijo za razvoj poslovnih rešitev, ki ne zahtevajo poglobljenega programerskega znanja in zagotavljajo visoko stopnjo prilagodljivosti in avtomatizacije.
Keywords: upravljanje terminov, nizkokodni razvoj, digitalizacija, Microsoft Power Apps, Microsoft Power Platform
Published in DKUM: 21.10.2025; Views: 0; Downloads: 7
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4. Uporaba orodja Power BI za analizo demografskih podatkov s ciljem izboljšanja uspešnosti prodajeMedina Mešanović, 2025, undergraduate thesis Abstract: Diplomsko delo obravnava uporabo orodja Power BI za analizo demografskih podatkov z namenom podpore podatkovno podprtemu odločanju v trženju. Namen dela je prikazati, kako lahko podjetja z analizo demografskih in vedenjskih vzorcev sprejemajo učinkovitejše marketinške odločitve in izboljšajo prodajno uspešnost. Raziskava temelji na simuliranem naboru podatkov, ki so bili najprej analizirani v Excelu, nato pa vizualizirani v orodju Power BI. Uporabljene metode vključujejo deskriptivno statistiko, primerjavo skupin in interaktivne prikaze za prepoznavanje vzorcev. Rezultati kažejo, da vizualna analiza omogoča boljše razumevanje ciljne skupine in olajša sprejemanje strateških odločitev. Zaključki poudarjajo pomen vključevanja sodobnih analitičnih orodij v trženjske procese in priporočajo širšo uporabo orodja Power BI v poslovnem okolju.
Keywords: Excel, Power BI, podatkovna analitika, demografski podatki, trženjsko odločanje
Published in DKUM: 21.10.2025; Views: 0; Downloads: 9
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5. Assessment of harmonic distortion in school buildings equipped with grid-connected PV systemsFranjo Pranjić, 2025, professional article Abstract: 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.
Keywords: 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
Published in DKUM: 01.10.2025; Views: 0; Downloads: 0
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6. International Conference Fluid Power 2025 : Conference Proceedings2025 Abstract: The International Fluid Power Conferences are a two day event, intended for all those professionally-involved with hydraulic or pneumatic power devices and for all those, wishing to be informed about the ‘state of the art’, new findings and innovations within the field of hydraulics and pneumatics. All papers included in the conference program are reviewed and collected in the conference proceedings. The gathering of experts at this conference in Maribor has been a tradition since 1995, and is organised by the Faculty of Mechanical Engineering at the University of Maribor, in Slovenia. Fluid Power conferences are organised every second year and cover those principal technical events within the field of fluid power technologies in Slovenia, and throughout this region of Europe. This year's conference FT2025 is taking place on the 17th and 18th September in Maribor, at Congress centre Habakuk.
Keywords: international conference, fluid power, science and profession, inovations, achievements
Published in DKUM: 16.09.2025; Views: 0; Downloads: 76
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7. On the Wiener-like root-indices of graphsSimon Brezovnik, Matthias Dehmer, Niko Tratnik, Petra Žigert Pleteršek, 2025, original scientific article Abstract: In this paper, we examine roots of graph polynomials where those roots can be considered as structural graph measures. More precisely, we prove analytical results for the roots of certain modified graph polynomials and also discuss numerical results. As polynomials, we use, e.g., the Hosoya, the Schultz, and the Gutman polynomial which belong to an interesting family of degree-distance-based graph polynomials; they constitute so-called counting polynomials with non-negative integers as coefficients and the roots of their modified versions have been used to characterize the topology of graphs. Our results can be applied for the quantitative characterization of graphs. Besides analytical results on bounds and convergence, we also investigate other properties of those measures such as their degeneracy which is an undesired aspect of graph measures. It turns out that the measures representing roots of graph polynomials possess high discrimination power on exhaustively generated trees, which outperforms standard versions of these indices. Furthermore, a new measure is introduced that allows us to compare different topological indices in terms of structure sensitivity and abruptness.
Keywords: graph theory, Hosoya polynomial, Schultz polynomial, Gutman polynomial, root-index, discrimination power, structure sensitivity
Published in DKUM: 03.07.2025; Views: 0; Downloads: 5
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8. Integrating carbon tax and subsidies : an evolutionary game theory-based shore power promotional strategy analysisTingwei Zhang, Cheng Hong, Tomaž Kramberger, Yuhong Wang, 2025, original scientific article Abstract: Shore power represents one of the principal solutions for the green transformation within the port industry. It significantly aids in the reduction in carbon emissions from vessels while they are berthed in port, yet often necessitates an effective promotional strategy to foster its installation and utilization. Stakeholders including port authorities, ship operators, and local governments all play a crucial role in achieving this objective. This paper employs a tripartite evolutionary game model in conjunction with a system dynamics model to investigate the evolutionary responses of stakeholders when policy tools are applied, and consequently, to elucidate the dynamics of strategy effectiveness. In this context, six business scenarios are developed to ascertain the potential impacts of implementing subsidies and carbon taxes. The findings demonstrate that any singular strategy, whether a subsidy or a carbon tax, is inadequate for the successful advancement of shore power; on the contrary, a government-led, integrated, and dynamic reward–punishment strategy aids in stabilizing the inherent fluctuations within this game process. Moreover, the initial willingness of ship operators exerts a considerably greater influence than that of the other two stakeholders.
Keywords: shore power, promotional strategies, reward–punishment, evolutionary game, system dynamics
Published in DKUM: 18.06.2025; Views: 0; Downloads: 1
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9. Razvoj nadzornih plošč za spremljanje e-izobraževanja v organizacijiAljoša Gostiša, 2025, master's thesis Abstract: V organizaciji je zbiranje in analiziranje podatkov vse pomembnejše za optimizacijo poslovnih procesov in doseganje poslovnih ciljev. S pomočjo naprednih analitičnih orodij lahko organizacija pridobi koristne vpoglede, ki podpirajo sprejemanje pomembnih odločitev. Magistrsko delo se osredotoča na razvoj funkcionalnih nadzornih plošč za spremljanje e-izobraževanja v izobraževalni organizaciji, ki uporablja sistem LMS za upravljanje učnih aktivnosti zaposlenih. Proces razvoja nadzornih plošč je zajemal več korakov. Pričeli smo z zbiranjem naročnikovih zahtev in opredelitvijo ključnih kazalnikov uspešnosti (KPI), ki jih organizacija želi spremljati. Sledila je priprava, transformacija in integracija podatkov v analitično orodje Power BI. S pomočjo orodja smo nato za naročnika razvili interaktivne vizualizacije in oblikovali tri nadzorne plošče – Splošno, Oddelki in Zaposleni. Te plošče omogočajo spremljanje KPI, kot so stopnja uspešnosti dokončanja tečajev, napredek zaposlenih in kakovost izobraževalnih vsebin. Organizacija tako pridobi orodje za učinkovito analizo e-izobraževanja, kar omogoča izboljšanje strategij in načrtovanje novih izobraževalnih programov. Pripravljene plošče so prilagodljive in omogočajo nadgradnje, kot je vključitev dodatnih podatkovnih virov, ki bi služili razvoju novih vizualizacij v skladu s potrebami naročnika.
Keywords: integracija podatkov, Power BI, analitična orodja, vizualizacija podatkov, nadzorne plošče
Published in DKUM: 11.06.2025; Views: 0; Downloads: 12
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10. Maximizing the power output and net present value of organic rankine cycle: application to aluminium industryMonika Dokl, Rok Gomilšek, Lidija Čuček, Ben Abikoye, Zdravko Kravanja, 2022, original scientific article Abstract: This study presents an integrated design and optimization of an Organic Rankine Cycle (ORC) for the recovery of waste heat from aluminium production. Non-Linear Programming (NLP) models were developed, with the objectives of maximizing electricity production and the Net Present Value (NPV) of the system. The models account for optimizing the operating conditions and changes in thermodynamic features of the system. The developed models are applied to a case study of Slovenian aluminium company where the performance of three different working fluids (R245fa, R1234yf and R1234ze) are compared. The optimization is performed considering different temperatures and prices of produced hot water and electricity, minimum approach temperature (DTmin), concentration of CO2 in flue gas and temperature and flowrate of flue gas. Results show that the selected working fluids for the proposed waste heat-based ORC system have the potential to substitute up to about 830 kW of electricity in a sustainable and economic manner. Out of the three working fluids considered, R245fa showed up to 7.9% efficiency of the ORC cycle and was identified as the best performing working fluid considering both economic viability and the amount of electricity produced by the system, however the refrigerant inherently has higher GHG footprint.
Keywords: waste heat, waste heat utilization, aluminium industry, organic rankine cycle, power generation, optimization
Published in DKUM: 10.04.2025; Views: 0; Downloads: 7
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