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Publicações

2025

Risk assessment of future power systems: Assuring resilience of electrification for decarbonization

Autores
Reiz, C; Gouveia, C; Bessa, RJ; Lopes, JP; Kezunovic, M;

Publicação
SUSTAINABLE ENERGY GRIDS & NETWORKS

Abstract
Increased electrification of various critical infrastructures has been recognized as a key to achieving decarbonization targets worldwide. This creates a need to better understand the risks associated with future power systems and how such risks can be defined, assessed, and mitigated. This paper surveys prior work on power system risk assessment and management and explores the various approaches to risk definition, assessment, and mitigation. As a result, the paper proposes how future grid developments should be assessed in terms of risk causes, what methodology may be used to reduce the risk impacts, and how such approaches can increase grid resilience. While we attempt to generalize and classify various approaches to solving the problem of risk assessment and mitigation, we also provide examples of how specific approaches undertaken by the authors in the past may be expanded in the future to address the design and operation of the future electricity system to manage the risk more effectively. The importance of the metrics for risk assessment and methodology for quantification of risk reduction are illustrated through the examples. The paper ends with recommendations on addressing the risk and resilience of the electricity system in the future resilient implementation while achieving decarbonization goals through massive electrification.

2025

Model Predictive Control Based Unified Power Quality Conditioner for Textile Industry Integrated Distribution Grids

Autores
Habib Ur Rahman Habib; uhammad Kashif Shahzad; Asad Waqar; Saeed Mian Qaisar; rooj Mubashara Siddiqui;

Publicação

Abstract
Abstract

Power quality (PQ) issues, including weak grids, voltage transients, harmonics, notches, current imbalance, and voltage sags, are critical challenges in the textile industry. Even a brief power interruption can halt industrial processes, leading to substantial financial losses. This paper proposes a Model Predictive Control (MPC)-based Unified Power Quality Conditioner (UPQC) as a robust solution to mitigate these PQ disturbances in textile industry-integrated distribution grids. The proposed UPQC is designed to enhance voltage stability, suppress harmonics, regulate reactive power, and correct current imbalance, ensuring uninterrupted industrial operation. A key contribution of this work is the realistic modeling of a textile industry’s electrical network, replicating actual industry ratings to evaluate system performance. The proposed MPC-based UPQC is assessed through five case studies, addressing weak vs. strong grids, voltage transients, current imbalance, and voltage sags—the most significant PQ challenges in textile applications. Simulation results demonstrate that the UPQC significantly improves voltage profiles, reduces harmonic distortion, and effectively compensates for current imbalance. Compared to conventional Proportional-Integral (PI) controllers, the MPC-based UPQC exhibits superior performance in dynamic PQ disturbance mitigation and grid stabilization. These findings underscore the proposed system’s suitability for large-scale industrial deployment, offering a cost-effective and robust solution to enhance operational efficiency and grid reliability in the textile sector.

2025

Digital Twins of the Ocean - Interoperability Pipeline Architecture

Autores
Berre, AJ; Sylaios, G; Agorogiannis, E; Mayer, I; Sarmento, P; Laudy, C; Oliveira, MA;

Publicação
OCEANS 2025 BREST

Abstract
The Iliad Digital Twins of the Ocean is a European Green Deal Project which aims at the development of an architecture and set of components, tools and services for the creation of digital twins of the ocean. The approach aims to support the emerging European Digital Twins of the Ocean (EDITO) initative with associated projects like EDITO Infra and EDITO Model lab and the overall Destination Earth (DestinE) initiative and also taking advantage of the evolving European Common Data Spaces including the Green Deal Data Space, the Copernicus Data Space and the EOSC cross domain Data Space. The paper presents the final version of the Iliad digital twin interoperability architecture based on four steps of a digital twin pipeline from Data Acquisition/Collection to Digital Twin Data Representation to Digital Twin Hybrid and Cognitive/AI Analytics Models and further to Digital Twin Visualisation and Control, which are presented together with associated Digital twin components and services.

2025

Requirements for Development of a Technological Solution to Support Teachers and Students with Integrative Projects in the Context of the Brazilian Federal Institutes of Education, Science and Technology: A Systematic Literature Review

Autores
Oliveira, L; Martins, P; Rocha, T;

Publicação
TECHNOLOGY AND INNOVATION IN LEARNING, TEACHING AND EDUCATION, TECH-EDU 2024, PT III

Abstract
The Federal Institutes of Education, Science and Technology, created by Law No. 11,892 of December 2008 [1], offer a multicurricular and multi-campus education specialized in professional and technological education. Of the 679 campuses of Brazilian Federal Institutes (FI), all adopt the Integrator Project (IP) or similar, as a component of the training curriculum for the promotion and development of scientific initiation. Aimed at promoting interdisciplinarity, development of professional skills and potential for innovation combined with the theoretical knowledge acquired in the classroom. At IFRS (Instituto Federal de Educacao Ciencia e Tecnologia) - Ibiruba Campus, the classes of the Computer Technician Integrated to High School participate in Integrative Projects that cover different themes, multidisciplinary teams and diverse curricular components [2]. Combining PI with pedagogical practice, research, teaching and extension is fundamental. However, it is necessary to develop computational tools that help teachers and students for their development. In order to delimit a coherent path and clarify controversies, the first step is to perform a Systematic Review of Literature (RSL). The research presented results capable of guiding the necessary requirements for the development of a tool that establishes an effective interaction of the student to assist the creation of Integrating Projects.

2025

Characterization of Indoor Reconfigurable Intelligent Surface-Assisted Channels at 304 GHz: Experimental Measurements, Challenges, and Future Directions

Autores
Alexandropoulos, GC; Jung, BK; Gavriilidis, P; Matos, S; Loeser, LHW; Elesina, V; Clemente, A; D'Errico, R; Pessoa, LM; Kürner, T;

Publicação
IEEE VEHICULAR TECHNOLOGY MAGAZINE

Abstract
Reconfigurable Intelligent Surfaces (RISs) are expected to play a pivotal role in future indoor ultra high data rate wireless communications as well as highly accurate three-dimensional localization and sensing, mainly due to their capability to provide flexible, cost- and power-efficient coverage extension, even under blockage conditions. However, when considering beyond millimeter wave frequencies where there exists GHz-level available bandwidth, realistic models of indoor RIS-parameterized channels verified by field-trial measurements are unavailable. In this article, we first present and characterize three RIS prototypes with unit cells of half-wavelength intercell spacing, which were optimized to offer a specific nonspecular reflection with 1-, 2-, and 3-bit phase quantization at 304 GHz. The designed static RISs were considered in an indoor channel measurement campaign carried out with a 304 GHz channel sounder. Channel measurements for two setups, one focusing on the transmitter-RIS-receiver path gain and the other on the angular spread of multipath components, are presented and compared with both state-of-the-art theoretical models as well as full-wave simulation results. The article is concluded with a list of challenges and research directions for RIS design and modeling of RIS-parameterized channels at THz frequencies.

2025

KDBI special issue: Explainability feature selection framework application for LSTM multivariate time-series forecast self optimization

Autores
Rodrigues, EM; Baghoussi, Y; Mendes Moreira, J;

Publicação
EXPERT SYSTEMS

Abstract
Deep learning models are widely used in multivariate time series forecasting, yet, they have high computational costs. One way to reduce this cost is by reducing data dimensionality, which involves removing unimportant or low importance information with the proper method. This work presents a study on an explainability feature selection framework composed of four methods (IMV-LSTM Tensor, LIME-LSTM, Average SHAP-LSTM, and Instance SHAP-LSTM) aimed at using the LSTM black-box model complexity to its favour, with the end goal of improving the error metrics and reducing the computational cost on a forecast task. To test the framework, three datasets with a total of 101 multivariate time series were used, with the explainability methods outperforming the baseline methods in most of the data, be it in error metrics or computation time for the LSTM model training.

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