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Publicações

Publicações por Ricardo Jorge Bessa

2026

Evolving power system operator rules for real-time congestion management

Autores
Moaidi, F; Bessa, J;

Publicação
Energy and AI

Abstract
The growing integration of renewable energy sources and the widespread electrification of the energy demand have significantly reduced the capacity margin of the electrical grid. This demands a more flexible approach to grid operation, for instance, combining real-time topology optimization and redispatching. Traditional expert-driven decision-making rules may become insufficient to manage the increasing complexity of real-time grid operations and derive remedial actions under the N-1 contingency. This work proposes a novel hybrid AI framework for power grid topology control that integrates genetic network programming (GNP), reinforcement learning, and decision trees. A new variant of GNP is introduced that is capable of evolving the decision-making rules by learning from data in a reinforcement learning framework. The graph-based evolutionary structure of GNP and decision trees enables transparent, traceable reasoning. The proposed method outperforms both a baseline expert system and a state-of-the-art deep reinforcement learning agent on the IEEE 118-bus system, achieving up to an 28% improvement in a key performance metric used in the Learning to Run a Power Network (L2RPN) competition. © 2025

2025

Dynamic incentives for electric vehicles charging at supermarket stations: Causal insights on demand flexibility

Autores
Silva, CAM; Andrade, JR; Ferreira, A; Gomes, A; Bessa, RJ;

Publicação
ENERGY

Abstract
Electric vehicles (EVs) are crucial in achieving a low-carbon transportation sector and can inherently offer demand-side flexibility by responding to price signals and incentives, yet real-world strategies to influence charging behavior remain limited. This paper combines bilevel optimization and causal machine learning as complementary tools to design and evaluate dynamic incentive schemes as part of a pilot project using a supermarket's EV charging station network. The bilevel model determines discount levels, while double machine learning quantifies the causal impact of these incentives on charging demand. The results indicate a marginal increase of 1.16 kW in charging demand for each one-percentage-point increase in discount. User response varies by hour and weekday, revealing treatment effect heterogeneity, insights that can inform business decision-making. While the two methods are applied independently, their combined use provides a framework for connecting optimization-based incentive design with data-driven causal evaluation. By isolating the impact of incentives from other drivers, the study sheds light on the potential of incentives to enhance demand-side flexibility in the electric mobility ecosystem.

2025

On the Definition of Robustness and Resilience of AI Agents for Real-time Congestion Management

Autores
Tjhay T.; Bessa R.J.; Paulos J.;

Publicação
2025 IEEE Kiel Powertech Powertech 2025

Abstract
The European Union's Artificial Intelligence (AI) Act defines robustness, resilience, and security requirements for high-risk sectors but lacks detailed methodologies for assessment. This paper introduces a novel framework for quantitatively evaluating the robustness and resilience of reinforcement learning agents in congestion management. Using the AI-friendly digital environment Grid2Op, perturbation agents simulate natural and adversarial disruptions by perturbing the input of AI systems without altering the actual state of the environment, enabling the assessment of AI performance under various scenarios. Robustness is measured through stability and reward impact metrics, while resilience quantifies recovery from performance degradation. The results demonstrate the framework's effectiveness in identifying vulnerabilities and improving AI robustness and resilience for critical applications.

2025

Graph Neural Networks for Fault Location in Large Photovoltaic Power Plants

Autores
Klyagina O.; Silva C.G.; Silva A.S.; Guedes T.; Andrade J.R.; Bessa R.J.;

Publicação
2025 IEEE Kiel Powertech Powertech 2025

Abstract
A fast response to faults in large-scale photovoltaic power plants (PVPPs), which can occur on hundreds of components like photovoltaic panels and inverters, is fundamental for maximizing energy generation and reliable system operation. This work proposes using a Graph Neural Network (GNN) combined with a digital twin for synthetic fault data scenario generation for fault location in PVPPs. It shows that GNN can adapt to system changes without requiring model retraining, thus offering a scalable solution for the real operating PVPPs, where some parts of the system may be disconnected for maintenance. The results for a real PVPP show the GNN outperforms baseline models, especially in larger topologies, achieving up to twice the accuracy in a fault location task. The GNN's adaptability to topology changes was tested on the simulated reconfigured systems. A decrease in performance was observed, and its value depends on the complexity of the original training topology. It can be mitigated by using several system reconfigurations in the training set.

2025

Generation of Power Network Operating Scenarios for an AI-friendly Digital Environment

Autores
Paulos J.; Silva P.R.; Bessa R.J.; Marot A.; Dejaegher J.; Donnot B.;

Publicação
2025 IEEE Kiel Powertech Powertech 2025

Abstract
With the growing need for AI-driven solutions in power grid management, this work addresses the challenge of creating realistic synthetic operating scenarios essential for developing, testing, and validating AI-based decision-making systems. It uses spatial-temporal noise functions, predefined patterns, and optimal power flow to model renewable energy and conventional power plant generation, load, and losses. Quantitative and visual key performance indicators are proposed to evaluate the quality of the generated operating scenarios, and the validation highlights the framework's ability to emulate diverse and practical operating scenarios, bridging gaps in AI-driven power system research and real-world applications.

2025

Human-AI interaction in safety-critical network infrastructures

Autores
Marco Mussi; Alberto Maria Metelli; Marcello Restelli; Gianvito Losapio; Ricardo J. Bessa; Daniel Boos; Clark Borst; Giulia Leto; Alberto Castagna; Ricardo Chavarriaga; Duarte Dias; Adrian Egli; Andrina Eisenegger; Yassine El Manyari; Anton Fuxjäger; Joaquim Geraldes; Samira Hamouche; Mohamed Hassouna; Bruno Lemetayer; Milad Leyli-Abadi; Roman Liessner; Jonas Lundberg; Antoine Marot; Maroua Meddeb; Viola Schiaffonati; Manuel Schneider; Thilo Stadelmann; Julia Usher; Herke Van Hoof; Jan Viebahn; Toni Waefler; Giacomo Zanotti;

Publicação
iScience

Abstract
Artificial Intelligence (AI) is transforming every aspect of modern society. It demonstrates a high potential to contribute to more flexible operations of safety-critical network infrastructures under deep transformation to tackle global challenges, such as climate change, energy transition, efficiency, and digital transformation, including increasing infrastructure resilience to natural and human-made hazards. The widespread adoption of AI creates the conditions for a new and inevitable interaction between humans and AI-based decision systems. In such a scenario, creating an ecosystem in which humans and AI interact healthily, where the roles and positions of both actors are well-defined, is a critical challenge for research and industry in the coming years. This perspective article outlines the challenges and requirements for effective human-AI interaction by taking an interdisciplinary point of view that merges computer science, decision-making sciences, psychological constructs, and industrial practices. The work focuses on three emblematic safety-critical scenarios from two different domains: energy (power grids) and mobility (railway networks and air traffic management). © 2025 Elsevier B.V., All rights reserved.

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