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Publicações

Publicações por CPES

2025

Comparative analysis of active rectifiers for hydrogen electrolyzer applications

Autores
Délcio Pedro; Rui Esteves Araújo;

Publicação
2025 IEEE Vehicle Power and Propulsion Conference (VPPC)

Abstract

2025

Current Estimation for Four-Phase Switched Reluctance Machines Using Two Current Sensors

Autores
Henrique Araújo Silva; Rui Esteves Araújo;

Publicação
2025 IEEE Vehicle Power and Propulsion Conference (VPPC)

Abstract

2025

A multi-objective stochastic optimization framework for government-run community energy storage systems auctions

Autores
Anuradha K.B.J.; Iria J.; Mediwaththe C.P.;

Publicação
Journal of Energy Storage

Abstract
This paper proposes a multi-objective stochastic optimization framework that can be used by governments to run auctions and select the best community energy storage system (CESS) projects to support. The framework enables CESS providers and energy community members to equitably benefit from the economic value generated by CESSs. The auction accepts offers from competing CESS providers that constitute the data of the CESS location, size, install time, technology, provider, investment cost, and energy trading price. The auction is run by a government agency which selects CESS projects that maximize the economic benefits and distribute them equitably among CESS providers and community members. The multi-objective stochastic optimization accounts for the multi-year uncertainties of photovoltaic (PV) generation, real and reactive energy consumption, energy trading prices, and PV installations. We exploit the Monte Carlo simulation and scenario trees to model the aforementioned uncertainties. The K-Means clustering method is used to reduce the number of scenarios, and thereby, lessen the computational burden of the optimization problem. Our experiments on an Australian low-voltage network with a community of prosumers and consumers demonstrate that government financial support can accelerate the installation of CESSs and enhance their business viability. This can be achieved by boosting the economic benefits shared between CESS providers and communities and ensuring these benefits are distributed equitably. Also, our experiments show that the economic benefits of all stakeholders are further improved with a high growth of the number of PV installations, and a slight reduction of energy import and export prices over the planning period.

2025

Adaptive Protection Strategies for Multi-Microgrid Systems: Enhancing Resilience and Reliability in Medium Voltage Distribution Networks

Autores
Habib, HUR; Reiz, C; Alves, E; Gouveia, CS;

Publicação
2025 IEEE KIEL POWERTECH

Abstract
This paper presents an adaptive protection strategy for multi-microgrid (MMG) systems with inverter-based resources (IBRs) in medium voltage (MV) networks, using the IEEE 33-bus test system. The approach combines overcurrent (OC) and undervoltage (UV) protections through an offline-optimized, clustering-based scheme and real-time selection of setting groups. A metaheuristic algorithm determines optimal relay settings for representative scenarios, ensuring responsive and coordinated protection. Hardware-in-the-loop validation on OPAL-RT confirms the method's effectiveness across varying loads, DER outputs, and fault conditions. Results demonstrate reliable fault isolation, smooth mode transitions, and uninterrupted supply to healthy segments. Identified limitations in high-impedance fault handling suggest future improvements.

2025

AI-Assisted Adaptive Protection for Medium Voltage Distribution Networks: A Two-Phase Application Proposal with HIL Testing

Autores
Alves, E; Reiz, C; Gouveia, C;

Publicação
2025 IEEE KIEL POWERTECH

Abstract
The increasing penetration of inverter-based resources (IBR) in medium voltage (MV) networks presents significant challenges for traditional overcurrent (OC) protection systems, particularly in ensuring selectivity, reliability, and fault isolation. This paper presents an adaptive protection system (APS) that dynamically adjusts protection settings based on real-time network conditions, addressing the challenges posed by distributed energy resources (DER). The methodology builds on ongoing research and development efforts, combining an offline phase, where operational scenarios are simulated using historical data, clustered with fuzzy c-means (FCM), and optimized with evolutionary particle swarm optimization (EPSO), and an online phase. To overcome the static nature of conventional schemes, a machine learning (ML)-based classifier is integrated into the APS, enabling real-time adaptation of protection settings. In the online phase, a centralized substation protection controller (CPC) leverages real-time measurements, communicated via IEC 61850 standard protocols, to classify network conditions using a support vector machine (SVM) classifier and activate the appropriate protection settings. The proposed APS has been validated on a Hardware-in-the-Loop (HIL) platform, demonstrating significant improvements in fault detection times, selectivity, and reliability compared to traditional OC protection systems. As part of a continued effort to refine and expand the system's capabilities, this work highlights the potential of integrating artificial intelligence (AI) and realtime/online decision-making to enhance the adaptability and robustness of MV network protection in scenarios with high DER penetration.

2025

Forecasting electric vehicle trips to support planning for the installation of charging stations using artificial intelligence techniques

Autores
Santos, F; Pinto, T; Baptista, J;

Publicação
2025 IEEE PES INNOVATIVE SMART GRID TECHNOLOGIES CONFERENCE EUROPE, ISGT EUROPE

Abstract
The growing adoption of electric vehicles (EVs) requires strategic planning of charging infrastructures to ensure greater efficiency and accessibility. In this context, forecasting EV trips becomes essential to identify travel patterns, anticipate demand for charging in different locations and strategically optimize the distribution of charging stations. This study proposes the use of Artificial Intelligence (AI) techniques to analyze mobility patterns and predict demand for charging in different locations. Three AI techniques will be explored: Fuzzy Logic, to deal with uncertainties associated with driver behavior; Supervised Machine Learning, encompassing Artificial Neural Networks (ANN), Support Vector Machine (SVM) and Linear Regression, to model and predict travel patterns; and Reinforcement Learning (RL), applied to the dynamic optimization of charging station distribution. The combination of these techniques aims to provide an intelligent and adaptive system for managing charging stations, contributing to sustainable mobility and the energy efficiency of the network.

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