REE&PQJ-23. ISSN: 3020-531X Index
Renewable Energies, Environment & Power Quality Journal (REE&PQJ)
Volume 23, Issue 2, July 2025-> Go to Issue 1
If you want to see the articles published by RE&PQJ until 2023, click here.
330
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142-149 Impact of the new network tariff system on end users of electricity utilizing green transition technologies: A case study J. Počivalnik(1), D. Kuhar(1), E. Simonič(1), S. Seme(1,2), K. Sredenšek(1,2) 1. Faculty of Energy Technology, University of Maribor. Slovenia 2. Faculty of Electrical Engineering and Computer Science, University of Maribor. Slovenia Abstract The paper examines the impact of the new network tariff system on end users utilizing green transition technologies in Slovenia. Using 15-minute electricity consumption measurements, the current situation was analyzed. Solar radiation data was used to estimate the expected electricity production from a photovoltaic system. Additionally, the influence of battery storage on grid electricity consumption was considered. The final results present the consumer’s monthly electricity costs under three different scenarios: the current situation, with a photovoltaic system, and with a photovoltaic system and battery storage. Electricity costs were calculated based on the updated methodology of the new network tariff system...READ MORE |
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333
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150-155 Energy consumption of data centres in Slovenia K. Deželak, T. Rutar Environment and Energy Statistics Section. Statistical Office of the Republic of Slovenia (SURS) Ljubljana. Slovenia Abstract Data centers are specialized facilities designed to computing resources such as servers, storage, and networking equipment. They provide the infrastructure needed to store, process, and distribute large amounts of data efficiently and securely. Data centres are large electricity consumers, so monitoring their consumption is important for studying and monitoring the environmental impacts of digitalization...READ MORE |
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156-162 Simulation and design software for photovoltaic self- J. Gomez-Cornejo, I. Lopez, I. Aranzabal, G. Casado Department of Electrical Engineering. E.I.B. University of the Basque country UPV/EHU. Bilbao. Spain Abstract This work presents the developed software for designing photovoltaic self-consumption systems using free and open-access and Python based Oemof packages. The program allows users to design their own systems, specifying variables, and obtaining simulation results. In includes de possibility of incorporating storage systems that can optimize performance and energy flows, making the systems more efficient and cost-effective. The software enables to analyse various scenarios, including grid interaction and battery storage, to determine the best configurations for different conditions...READ MORE |
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163-169 On the IoT architecture for real-time monitoring and control of offshore wind turbines using multithreaded B. Sánchez Centeno(1) , M. Fernández de Diego(1), M. Santos Peñas(2), S. Esteban San Román(3) 1. Computer Sciences Faculty. University Complutense of Madrid. Spain 2. Institute of Knowledge Technology. Complutense University of Madrid. Spain 3. Faculty of Physics. Complutense University of Madrid. Spain Abstract This paper presents an IoT architecture for real-time monitoring and control offshore wind turbines using multithreaded low-cost boards. The system aims to address the challenges of offshore wind energy, particularly for deepwater and floating turbines, by developing an affordable solution that enhances reliability, maintainability, safety and efficiency. The architecture consists of two levels: a low-level system for local data collection and control and a high-level system for real-time monitoring and command execution...READ MORE |
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360
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170-174 Evaluation of the energy transition roadmaps in islands: Cape B. González-Díaz(1), O. Afonso-García(1), I. Rocha Lima(1), C. Pires Monteiro(1), M. Aznar(2), N. Martín-Dorta(3), E. González-Díaz(3) 1. Departamento de Ingeniería Industrial, Escuela Superior de Ingeniería y Tecnología, Universidad de La Laguna (ULL) Tenerife. Spain 2. Departamento Física, Facultad de Ciencias, Universidad de La Laguna (ULL) Tenerife. Spain 3. Departamento de Técnicas y Proyectos en Ingeniería y Arquitectura, Escuela Politécnica Superior de Ingeniería, Universidad de La Laguna (ULL) Tenerife. Spain Abstract This paper explores the potential pathways for achieving total decarbonization in Cape Verde using the EnergyPLAN software. This research focuses on the unique challenges and opportunities faced by small island developing states (SIDS) in transitioning to renewable energy sources. Cape Verde, with its ambitious goal of 100% renewable electricity, serves as an ideal case study due to its diverse energy resources and the need for sustainable development...READ MORE |
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175-182 New methodology for network charge calculation in Slovenia: Case study for balcony solar power plant and battery S. Seme(1,2), J. Počivalnik(1), D. Kuhar(1), E. Simonič(1), K. Sredenšek(1,2) 1. Faculty of Energy Technology, University of Maribor. Slovenia 2. Faculty of Electrical Engineering and Computer Science, University of Maribor. Slovenia Abstract This paper aims to examine a new methodology for calculating network charges in Slovenia, using the example of an apartment with and without a balcony solar power plant and an energy storage system. A balcony solar power plant is defined as a plug-in generation unit installed on a balcony or another suitable surface. It is connected solely to the internal electrical installation of a household consumer...READ MORE |
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183-190 Analysis of amorphous power in different photovoltaic system D. Kuhar(1), J. Počivalnik(1), E. Simonič(1), K. Sredenšek(1,2), S. Seme (1,2) 1. Faculty of Energy Technology, University of Maribor. Slovenia 2. Faculty of Electrical Engineering and Computer Science, University of Maribor. Slovenia Abstract This paper aims to analyse the amorphous power output of three different photovoltaic systems – fixed photovoltaic system, photovoltaic/thermal system and tracking photovoltaic system which are all located at the Institute of Energy Technology, Faculty of Energy Technology, University of Maribor. Over the course of a year, the production analysis is conducted at annual, monthly, and quarterly levels to determine which system achieves the highest electricity production across different time intervals... READ MORE |
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370
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191-197 Modeling and Optimization of Parameters for Parabolic Trough Collectors in Solar Heat for Industrial Processes: A Case Study in A.E. Khaitmukhamedov, D.Y. Jalilov, O.A. Abdulkhaev Physical-Technical Institute of Uzbekistan Academy of Sciences. Tashkent Uzbekistan Abstract This article provides a comprehensive analysis of using parabolic trough collectors (PTCs) for industrial heating in Tashkent’s climate. It examines the energy, environmental, and economic benefits of this technology, considering various temperature modes and system configurations. Using the System Advisor Model (SAM) software, the study identifies optimal parameters for the solar multiple (SM) and thermal energy storage (TES) system to minimize the levelized cost of heat (LCOH)...READ MORE |
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198-206 Nanofluids: A Promising Heat Transfer Fluid for Solar Collectors Tukhtamurod Juraev, Dilshod Jalilov, Akbar Halimov, Jasurjon Akhatov Physical-technical institute, Uzbekistan Academy of Sciences,Tashkent. Uzbekistan Abstract This study investigates how MWCNT-based nanofluids enhance the performance of direct absorption solar collectors (DASC) compared to traditional water-based systems. The findings reveal that MWCNT nanofluids keep a higher temperature range of 296-302 K, better than water 295-300 K, and achieve a specific heat gain of up to 800 W/m², which is significantly higher than water’s peak of less than 50 W/m²...READ MORE |
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207-212 Accurate Temperature Measurement for Renewable Energy Applications: A Reverse Biased Silicon Diode O.A. Abdulkhaev, D.B. Istamov, A.R. Abdulkhaeva, Sh.M. Kuliyev, D.M. Yodgorova, A.Z. Rakhmatov Physical-Technical Institute of Uzbekistan Academy of Sciences, Tashkent. Uzbekistan Abstract A novel silicon diode temperature sensor (DTS) incorporating a fully depleted base region has been developed specifically for applications in renewable energy. The sensor employs the voltage across the fully depleted base as the principal parameter for temperature measurement. Upon application of a defined reverse bias (Uo), complete depletion of the base region of the silicon diode is achieved...READ MORE |
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213-221 The Role of Pumped Storage in the Integration of Renewable Energies: Planning the Expansion of Electricity Generation on Santiago Island, Cabo Verde I. Lima(1), B. González-Díaz(2), A. Costa(3) 1. International Interuniversity Master Degree in Energy Decarbonization in Emerging Countries, University of La Laguna and University of Cabo Verde (Spain and Cabo Verde) 2. Department of Industrial Engineering. Escuela Superior de Ingeniería y Tecnología, La Laguna. Tenerife. Spain 3. University of Cabo Verde Abstract The growing demand for electricity and the urgent need to mitigate climate change have driven countries towards a decarbonized path, increasing the share of renewable energy sources in the power mix. However, the intermittent nature of wind and solar power poses challenges to grid stability and security of supply, requiring innovative solutions such as energy storage. Hydropower, particularly pumped storage systems, can play an important role by storing renewable electricity excess and stabilizing the grid, thereby supporting higher renewable energy penetration...READ MORE |
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222-229 Preliminary Characterization of Solar Radiation Patterns in the Canary Islands: An Integrated Approach Combining Clustering and Spatial Interpolation Techniques R. Fernández-Vega(1), B. González-Díaz(1), J. M. Márquez-Martinón(2), N. Martín-Dorta(2), E. González- Díaz(2), A. Pérez-García(2), J. Jubera- Pérez(3), E. Jaizme-Vega(3) 1. Departamento de Ingeniería Industrial, Escuela Superior de Ingeniería y Tecnología, Universidad de La Laguna (ULL) Tenerife. Spain 2. Departamento de Técnicas y Proyectos en Ingeniería y Arquitectura, Escuela Politécnica Superior de Ingeniería, Universidad de La Laguna (ULL) Tenerife. Spain. 3. Servicio de Laboratorios y Calidad de la Construcción del Gobierno de Canarias, Canary Islands. Spain Abstract This study focuses on categorize solar radiation patterns in the Canary Islands using the clearness index (Kt) and clustering techniques This study utilizes data from multiple meteorological stations measurements to create a comprehensive dataset. The K-means algorithm is applied to the clearness index data, identifying distinct radiation zones within the Canary Islands. The analysis reveals four distinct radiation zones, each characterized by varying frequencies of cloudy, partially clear, and very clear days... READ MORE |
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230-236 Influence of supplementary installed optical structures on VA characteristics of photovoltaic modules Milan Belik(1), Olena Rubanenko(1,2,3,4), Iryna Hunko(2,3) 1. Department of Electrical Power Engineering. University of West Bohemia Plzen. Czech Republic 2. Institute of Renewable Energy, Kyiv. Ukraine 3. Research and Innovation Centre for Electrical Engineering, University of West Bohemia. Plzen. Czech Republic 4. Department of electric station and system, Vinnytsia. Ukraine Abstract This paper focuses on optimisation of energy gains for various types of supplementary installed optical structures on photovoltaic modules. The project is based on real measurements using modified Flash Tester Unit and theoretical calculations based on modified equations describing the intensity of incident rays. A standard flash tester unit was modified to enable measurements using various spectrum, incident angle and variable composition between direct and ambient intensity while the homogeneity and precision was preserved. In similar way, the conventional equations used for calculations of incident rays on surface of photovoltaic module were modified to describe the angle and surface of optical structures supplementary installed on photovoltaic modules...READ MORE |
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237-242 Energy community in the task determining the origin of electricity from low-carbon energy sources for consumers Milan Belik(1), Iryna Hunko(2,3), Olena Rubanenko (1,2,3,4) 1. Department of Electrical Power Engineering. University of West Bohemia.Plzen Czech Republic 2. Institute of Renewable Energy, Kyiv. Ukraine 3. Research and Innovation Centre for Electrical Engineering, University of West Bohemia. Plzen. Czech Republic 4. Department of electric station and system, Vinnytsia. Ukraine Abstract Implementation in Ukraine of the 5Ds strategy is discussed. The Energy Community is one of the approaches to implementing the 5Ds strategy. Citizens want to use electricity produced from low-carbon energy sources. The paper focuses on the possibility of applying a method for calculating individual components of electricity flows in the branches of an electric power grid caused by generation and consumption in the nodes. In particular, it is about estimating the portion of electricity of a particular consumer that it receives from low-carbon energy sources (LCES). The method is based on methods and algorithms for calculating steady-state modes of power grids... READ MORE |
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243-250 How can we create a map of the near-ground wind resource for a W.-G. Früh(1), A. Elliott(2), K. Velayutham(2) 1 Institute of Mechanical, Process and Energy Engineering, Heriot-Watt University, Edinburgh. United Kingdom 2. Katrick Technologies, Glasgow. United Kingdom Abstract To overcome the challenges to make small-scale wind energy projects cost-effective and a useful contribution to energy consumption both, further small-scale turbine development is needed to maximise capture of the near-ground resource which is characterised by low mean wind speeds and high turbulence intensity, and a robust site evaluation and installation methodology to ensure placing devices in the best places and to have a reliable and realistic estimation of devices to be installed in those places... READ MORE |
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251-257 Shifting Angles, Shifting Revenues: An Assessment of the Emely Cruz-De-Jesús, Ángel Arcos-Vargas, Antonio Gómez-Expósito Electric Power Systems Research Group, University of Seville. Spain Abstract The significant reduction in the production costs of photovoltaic energy is leading to a rapid increase in the number of new facilities connected to the grid, with fixed systems currently being the most frequent. Until now, facilities have been designed to obtain the maximum amount of energy but, as the production is concentrated in the central hours of the day, the expansion of supply in these hours causes a significant reduction in prices, becoming zero or negative, which would compromise the economic sustainability of these facilities...READ MORE |
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258-263 Mathematical modelling of renewable energy communities for B. Molnar, I. Vokony Department of Electric Power Engineering. Budapest University of Technology and Economics. Hungary Abstract The spread of energy communities worldwide has accelerated in recent years. Energy communities also constitute a promising option for the deployment of renewable-based local electricity generation and use in the European Union, which can play a key role in the green transition and in enhancing the security of energy supply... READ MORE |
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264-272 Cuckoo Search Algorithm Applied for Maximum Power Point Determination of Bifacial PV Using Different PV Cell Models A. Najdoska, G. Cvetkovski Faculty of Electrical Engineering and Information Technologies. Ss. Cyril and Methodius University. Skopje. North Macedonia Abstract This paper proposes an application of a novel nature-inspired algorithm called Cuckoo Search Algorithm (CSA) in the determination of the maximum power point in a bifacial photovoltaic (PV). The optimisation algorithm mimics the behaviour of the cuckoo birds, especially their very strange reproduction strategy. The Cuckoo Search in general is a minimisation search algorithm and suits fine with the objective function of this investigation, which is the absolute value of the power difference of the calculated and catalogue value for given metrological conditions...READ MORE |
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273-281 Experimental and Simulated Analysis of Cloud Passage Effects on a Solar-Tracked Stand-Alone PV Water Pumping System J.S. Artal-Sevil(1), J.M. Lujano-Rojas(1), R. Dufo-López(1), T. Vazquez- Pulido(2), J. Longás-Aranda(2), S. Bea-Alvarez(2) 1. Department of Electrical Engineering. Higher Technical School of Industrial Engineering, University of Zaragoza. Spain 2. Bombeatec. Research and Development Center. Zaragoza. Spain Abstract This paper presents an in-depth analysis and simulation of the effects produced by cloud passages on the operation of a stand-alone direct photovoltaic (PV) water pumping system. The study is based on a long-term experimental dataset collected at an isolated PV installation in Cariñena (Spain), specifically designed for agricultural irrigation. Cloud events were classified into three main types -cloud trains, compact clouds, and isolated cloud events- and their statistical occurrence and impact on system performance were evaluated across different seasons...READ MORE |
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282-290 Experimental LiFePO4 Battery Cycling System. Analysis and Simulation of a stand-alone/on-grid Photovoltaic Applications J.S. Artal-Sevil, J.M. Lujano-Rojas, R. Dufo-López, J.L. Bernal-Agustín, J.A. Tejero-Gómez Department of Electrical Engineering. Higher Technical School of Industrial Engineering. University of Zaragoza. Spain Abstract This paper presents the design, modeling, and validation of an experimental LiFePO4 battery cycling system applied to stand-alone and on-grid photovoltaic (PV) scenarios. A comprehensive analysis of battery behaviour -including key parameters such as SOC, SOH, DOD, and internal resistance- is conducted to highlight the advantages of LiFePO4 chemistry in terms of safety, thermal stability, and cycle life... READ MORE
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