521

Optimisation of water-free Phase Change Emulsions for cold energy storage

A. Tenorio-Alfonso(1), C. Delgado-Sánchez(1), A. A. Cuadri(1), P. Partal(1), A. Guerrero(2), F.J. Navarro(1)

1. Pro 2 TecS-Chemical Product and Process Technology Research Centre,

Department of Chemical Engineering, Physical Chemistry and Materials

Science, University of Huelva. Spain

2. Department of Chemical Engineering, University of Seville, Escuela

Politécnica Superior. Spain

Abstract

The transition to sustainable energy systems is essential for reducing reliance on traditional fossil fuels and combating climate change. In this context, advanced energy storage technologies, such as Thermal Energy Storage (TES) systems, play a pivotal role. These systems utilize Phase Change Materials (PCMs) that store thermal energy through solid-liquid phase transitions. To enhance their flow behaviour, these materials can be dispersed in heat transfer fluids, resulting in Phase Change Emulsions (PCEs)...READ MORE

522

Comparative Analysis of Long-Term Solar Resource Databases for Global Horizontal Irradiance Prediction

F. Sousa(1), J. Mendonça(2), R. Pilão(1), P. Pinto(3)

1. CIETI, Instituto Superior de Engenharia do Porto. Portugal

2. SIIS, Instituto Politécnico do Porto. Portugal

3. MEGAJOULE S.A. Portugal

Abstract

The short measurement periods of local solarresource measurement campaigns limit the representativeness of these measurements in long-term energy production estimates for solar projects. This study aimed to characterize the main long-term solar resource databases and correlate them with data provided by meteorological stations, with the purpose of identifying the database that best predicts solar radiation at specific locations...READ MORE

523

Smart Bioinsulating Composites for Thermal Comfort and Energy

Efficiency

C. Delgado-Sánchez, A. Tenorio-Alfonso, F. J. Navarro, P. Partal

Pro2TecS-Chemical Process and Product Technology Research Center

Department of Chemical Engineering, Physical Chemistry and Material Sciences

ETSI, University of Huelva. Spain

Abstract

This work aims to develop an efficient technologyfor valorizing by-products from agricultural and forestry activities by creating high-performance thermal insulators. Complex biodispersions were designed by incorporating phase change materials (PCM) into biofoams for thermal storage and regulation applications. The developed composites demonstrated effective PCM encapsulation, with latent heat storage capacities reaching up to 96.58 J/g for the highest PCM concentration studied...READ MORE

524

Method for the identification of regulatory barriers to the integration of renewables in electricity systems. A case study

C. Medina-Álvarez(1), S. Velázquez-Medina(2)

1. Doctoral School of the University of Las Palmas de Gran Canaria, Canary

Islands. Spain

2. Department of Electronics and Automatics Engineering, University of Las

Palmas de Gran Canaria, Canary Islands. Spain

Abstract

The European Union (EU) has set up a regulatoryframework aimed at maximizing the integration of renewables in the energy systems of its member countries for the purpose of decarbonisation, establishing a series of specific targets and time horizons. The regulatory framework that is established for the energy sector of each country will have a major influence on whether the targets set are attained within the scheduled time horizon...READ MORE

525

Long-term stability of a low-cost sensor for aerosol measurements: insights for the development of air-quality monitoring networks in solar power plants

J. López-Solano, S. Alonso-Pérez

Departamento de Ingeniería Industrial

Escuela Superior de Ingeniería y Tecnología, Universidad de La Laguna,Tenerife. Spain

Abstract

With a view to improve the warning and forecastsystems of solar power plants, in this work we examine the feasibility of using low-cost sensors for measuring mass concentrations of suspended particulate matter of natural origin, such as that caused by African dust outbreaks. In Spain, these events especially affect the Canary Islands, and South and Mediterranean coast of the mainland, and they have been shown to have a large effect on solar photovoltaic power production...READ MORE

526

Experimental analysis of the hydrodynamic performance in four

configurations of gravitational vortex turbines

Laura Velásquez(1), Rubio-Clemente A(1,2), Chica E(1)

1. Grupo de Investigación Energía Alternativa, Facultad de Ingeniería, Universidad

de Antioquia, Medellín. Colombia

2. Escuela Ambiental, Facultad de Ingeniería, Universidad de Antioquia,

Medellín. Colombia.

Abstract

In this study, an experimental evaluation of fourgeometric configurations of gravitational vortex turbines was conducted. The configurations result from the combination of two types of inlet channels: a tangential and a spiral, and two types of discharge chambers: a cylindrical and a conical one...READ MORE

527

Assessing solar heating of binders to be applied in roofs, roads or heat collectors

R. Álvarez-Barajas, B. García-Márquez, C. Delgado-Sánchez, A.A. Cuadri, F.J. Navarro, P. Partal

Pro2TecS-Chemical Process and Product Technology Research Centre, Department of Chemical Engineering, ETSI. Universidad de Huelva. Spain

Abstract

Enhancing the energy efficiency of buildings, roads, or other applications involves, as a main challenge, the development of innovative materials with customised thermomechanical properties and thermal energy capabilities while maintaining cost effectiveness. These materials can be designed to find application as solar heat absorbers or to prevent issues related to urban heat island...READ MORE

528

Towards Cost-Effective and Scalable Fuel Cells: Electrochemical Characterization of a Reference Cell for Material Innovation

F.J. Asensio(1), R. Martínez de Ternero(1), M. González-Pérez(1), A. Ordoño(1), A. Villamayor(2), M.A. Moreno-Fernández(3)

1. Department of Electrical Engineering. Engineering School of Gipuzkoa –

University of the Basque Country - UPV/EHU. Spain

2. Department of Hydrogen Technologies. TEKNIKER, Basque Research and

Technology Alliance (BRTA). Spain

3. Technology Research Department - Protio Power SL. Amorebieta-Etxano.

Spain

Abstract

Accurate electrochemical modelling of hydrogen fuel cells (FCs) is essential for performance optimization and comparative analysis of different cell configurations. This study presents the electrochemical characterization of a reference FC with graphite bipolar plates, utilizing voltammetry and electrochemical impedance spectroscopy (EIS)...READ MORE

529

Optimal Autonomous Electric Vehicle Charging Algorithm for Minimising Battery Degradation

M. González-Pérez(1),  F. J. Asensio(1), A. Ordoño(1),  G. S. Quansah(2),  G. Saldaña(2), I. Zamora(2)

1. Department of Electrical Engineering. G.I.E. Eibar, University of the Basque

Country (UPV/EHU) Spain

2. Department of Electrical Engineering. B.I.E., University of the Basque Country

(UPV/EHU) Bilbao. Spain

Abstract

The large-scale adoption of electric vehicles (EVs) requires controlled integration into the power system to avoid security and stability issues. While centralised charging strategies offer theoretically optimal solutions, they require extensive data and communication infrastructure, limiting user flexibility. Conversely, collaborative algorithms enhance decentralisation but face challenges related to data privacy, real-time communication, and implementation complexity...READ MORE

530

Analysis of Grounding Systems Interference between Smart Tunnel and Electrical Distribution Grids

A. Fioravanti, A. Prudenzi, F. Ciancetta, E. Fiorucci, S. Mari

Department of Industrial and Information Engineering and Economics.

University of L’Aquila. Italy

Abstract

The growing demand for services in urban areas,hidden from view, has spurred the development of innovative solutions such as the Smart Tunnel. This advanced infrastructure enables centralized and secure management of major city sub-services, including electricity, water and telecommunications networks, which are continuously subject to evolutions and upgrades. In addition, thanks to the Smart Tunnel configuration, maintenance interventions, modifications or the implementation of new connections are significantly simplified and more efficient...READ MORE

531

Designation of Renewable Acceleration Areas for Wind Power Using MCDM and GIS

T. Erdei, T. Soha, B. Hartmann

Institute for Energy Security and Environmental Safety, Department of Environmental Physics, HUN-REN Centre for Energy Research. Budapest. Hungary

Abstract

The study presents a comprehensive methodologyfor designating Renewable Acceleration Areas (RAAs) using Multi-Criteria Decision Making (MCDM) and Geographic Information Systems (GIS) within a technical scenario. It integrates technical, environmental, and socio-economic criteria (or factors) to identify suitable locations for wind energy projects. The methodology emphasizes data collection, stakeholder consultation, and comprehensive spatial planning to ensure balanced and sustainable outcomes...READ MORE

532

Adaptive VSG-based grid forming controller for optimal damped

response under dynamic grid conditions

A. Ordoño(1), J. Rodriguez-Gongora(2), A. Rubio-Egaña(1), A. Sanchez-Ruiz(3), P. Fernández-Bustamante(4), F.J Asensio(1), O. Lopez-de-Suso(3), A. Gomez-Haya(3)

1. Department of Electrical Engineering. Faculty of Engineering, Gipuzkoa,

University of the Basque Country (UPV/EHU) Spain

2. Electronics and Computing Department, Mondragon Unibertsitatea. Spain

3. Department of Electronic Technology. Faculty of Engineering Vitoria-Gasteiz,

University of the Basque Country (UPV/EHU) Spain

4. Department of Electronic Technology. Faculty of Engineering Vitoria-Gasteiz,

University of the Basque Country (UPV/EHU) Spain

Abstract

Grid forming inverters are a promising technologyto ensure the stability of weak grids. One typical strategy is the virtual synchronous generator (VSG) approach, which mimics the swing equation of synchronous generators. This strategy can provide inertia, primary frequency regulation and damping to the grid. However, in classical VSG structures, these three characteristics cannot be managed independently, and damping is usually limited...READ MORE

533

Ditribution network hosting capacity calculation enhancement through time series analysis and performance index

I. Taczi, B. Tozser, I.Vokony

Department of Electrical Engineering

Budapest University of Technology and Economics. Budapest. Hungary

Abstract

The increasingly ambitious renewable energytargets highlight the system integration of intermittent generation as an important research area. Achieving these targets poses a significant challenge for distribution system operators and transmission system operators all around the world. The human resource shortage and time constraints faced by network operators further exacerbate these issues, and as a result, conventional network development solutions do not always provide the optimal solution...READ MORE

534

Time domain assessment of power system stability in case of high share of non-synchronous generation – limitation analysis of electromechanical transient simulations

I. Taczi, I. Vokony, B. Hartmann, P. Juhasz

Department of Electric Power Engineering. Budapest University of Technology and Economics, Budapest.  Hungary

Abstract

The transition from centralized synchronousgeneration to distributed renewable energy sources has introduced significant challenges to power system dynamics and stability. This shift disrupts traditional assumptions in modelling methodologies and calls for a re-evaluation of simulation practices. Power system frequency stability is widely analysed through time domain electromechanical transient simulation, where the electrical frequency is calculated by the swing equation...READ MORE

535

On the Aggregated Modelling of Large-Scale Wind Farms

for Harmonic Studies

A. Bracale(1), P. Caramia(1), R. Langella(2), P. Varilone(3), P. Verde(3)

1. Department of Engineering. University of Naples Parthenope. Naples. Italy

2. Department of Engineering. University of Campania. Aversa. Italy

3. Dep. of Electrical and Information Engineering & DIAEE. University of Cassino

and Lazio Meridionale & La Sapienza Università di Roma. Italy

Abstract

In this paper, the aggregated modelling of large-scalewind farms for harmonic studies is considered. The limitations of the harmonic emission assessment based on the IEC 61000-3-6 summation rule are analysed in a probabilistic framework. An iterative probabilistic procedure based on the Quasi Monte Carlo technique is proposed and applied to a simplified electromagnetic transient model of an exemplary wind power plant...READ MORE

536

Strategies and limitations for the detection of sub-synchronous

oscillations in power systems

Stefano Lodetti, Frederick Wilkins, Alex Mitroi, Peter Davis, Deborah Ritzmann , Paul Wright

National Physical Laboratory. Teddington. United Kingdom

Abstract

Sub-synchronous oscillations pose a significantchallenge in modern power systems, particularly in networks with high penetration of power electronic converters. While phasor measurement units (PMUs) are generally used for grid monitoring, their ability to detect sub-synchronous oscillations is being challenged...READ MORE

537

Net-Zero Energy House management with stationary and mobile energy storage batteries

María Isabel Milanés-Montero(1), João Martins(2), Carlos Roncero-Clemente(1), Eva González-Romera (1), Fermín Barrero-González(1), Javier Gutiérrez-Escalona(1)

1. Electrical, Electronic and Automation Engineering Department.

School of Industrial Engineering, University of Extremadura. Badajoz. Spain

2. NOVA School of Science & Technology. Universidade Nova de Lisboa. Portugal

Abstract

This paper presents an energy management system for a Net-Zero Energy House. The house is equipped with photovoltaic panels on the roof, a stationary energy storage system, and a Battery Electric Vehicle. The energy management strategy aims to minimize the house interaction with the power grid, enabling internal power flow without impacting upstream of the point of common coupling...READ MORE

538

Experimental Analysis and Modelling of an AEM Electrolyzer

A. Monterroso-Muñoz(1), E. López-González(1), M. Ridao(2), D. Tejada(1), A. Castro(1)

1. Department of Energy Systems. National Institute of Aerospace Technology,

Huelva. Spain

2. Department of Systems and Automatics Engineering. Universidad de Sevilla. Spain

Abstract

Anion Exchange Membrane (AEM) electrolysis isa relatively recent technology that is gaining popularity due to its technical advantages over traditional alkaline electrolysis and its closer similarities to Proton Exchange Membrane (PEM) electrolysers. Both AEM and PEM technologies hold significant potential to address future integration challenges in renewable energy systems for green hydrogen production. However, research on AEM is still very limited...READ MORE

539

Analysis of fault ride through in wind farms during network faults

Tomislav Rajić(1), Pablo Eguia(2),  Aitor Blazquez(2) D. Marene Larruskain(2)

1. School of Electrical Engineering, University of Belgrade. Serbia

2. Department of Electrical Engineering, School of Engineering in Bilbao, University

of the Basque Country (UPV/EHU) Spain

Abstract

Fault Ride Through (FRT) is a term used to describe the ability of wind farms to remain connected to the system during disturbances, such as short circuits or voltage drops. This capability is vital for maintaining the stability of power systems and preventing the adverse consequences that may arise from wind power outages during disturbances. In addition to FRT, modern Grid Codes require wind farms to inject current during the fault under specific conditions, to sustain voltage and help protection relays detect and clear the fault...READ MORE

540

Two-stage optimization for energy management and power allocation in a Virtual Power Plant of residential microgrids

E. González-Romera, C. Roncero-Clemente, E. Romero-Cadaval, M.I. Milanés-Montero, F. Barrero-González, A.A. Alvi

Department of Electrical, Electronic and Control Engineering

E.I.I., Extremadura University. Badajoz. Spain

Abstract

This paper proposes a dual-stage optimizationprocess for a Virtual Power Plant that aggregates resources from various residential microgrids with photovoltaic generation, energy storage systems, and electric vehicles with bidirectional charging possibilities. The optimization objectives include cost reduction, peak shaving, and flexibility service provision...READ MORE