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About

About

Rui E. Araújo received the electrical engineering graduation, M. Sc. and Ph. D. degrees from the Faculty of Engineering of the University of Porto, Portugal in 1987, 1992 and 2001, respectively. From 1987 to 1998, he was an Electrotechnical Engineer in Project Department, Adira Company, Porto, Portugal, and from 1988 to 1989, he was researcher with INESC, Porto, Portugal. Since 1989, he has been with the University of Porto, where he is an Assistant Professor with the Department of Electrotechnical and Computer Engineering at Faculty of Engineering. He is a Researcher in the Power Systems Unit of INESC PORTO. His research interests are focused on motion control and electric vehicles. Recently, his areas of interests include the design and control of grid-connected converters for micro-grids and electric vehicles.

Interest
Topics
Details

Details

  • Name

    Rui Esteves Araujo
  • Cluster

    Power and Energy
  • Role

    Senior Researcher
  • Since

    01st April 2010
001
Publications

2018

An outline of fault-tolerant control system for electric vehicles operating in a platoon

Authors
Lopes, A; Araújo, RE;

Publication
IFIP Advances in Information and Communication Technology

Abstract
High level vehicle automation systems are currently being studied to attenuate highway traffic and energy consumption by applying the concept of platooning, which has gained increased attention due to progresses in the next generation of mobile communication (5G). The introduction of more complex automation systems originates, however, fault entry points that hinders the system safety and resilience. This paper presents an initial control architecture for the electric vehicles platoon from a fault-tolerant control perspective. To achieve a fault-tolerant platooning structure an over-actuated electric vehicle topology is proposed which may allow the implementation of different redundancies. Furthermore, some of the major challenges in the platooning network control system (NCS) are presented and the techniques to overcome these issues are explored. © IFIP International Federation for Information Processing 2018.

2018

Modeling and Simulation of a Switched Reluctance Motor with Hysteresis Effect

Authors
Melo, P; Araujo, RE;

Publication
2018 INTERNATIONAL SYMPOSIUM ON POWER ELECTRONICS, ELECTRICAL DRIVES, AUTOMATION AND MOTION (SPEEDAM)

Abstract
Switched reluctance machines (SRM) are simple, robust and fault tolerant machines, usually operating under strong nonlinear characteristics. Therefore, accurately modeling this machine is a demanding task. Several models have been proposed, where magnetic saturation is often addressed, without considering hysteresis effect. In the proposed model the SRM magnetization characteristics are generated through the Jiles-Atherton (J-A) hysteresis model. Thus, instead of a post-processing inclusion, hysteresis is considered in simulation. This is the model main attribute, which is discussed in detail. This may contribute for a better understanding of hysteresis impact over the SRM operation modes. Simulation results are also presented and discussed.

2018

A practical comparison of two algorithms for inverter control with virtual inertia emulation

Authors
Barbosa, D; Ramos, J; Rodrigues, J; Lopes, A; Araujo, RE;

Publication
20th Power Systems Computation Conference, PSCC 2018

Abstract
Renewable energy sources are environmentally appealing in electrical power grids. However, distributed energy resources (DER) are typically connected to the grid through converters that do not have the same properties as synchronous generators which have high participation in power generation. Some of these properties like inertial response are important and must not be lost with higher DER penetration. The present paper analyses two converter control algorithms that are capable of emulating inertial response in DER: the Virtual Synchronous Generator control (VSG) and the Synchronverter. Both algorithms are described, implemented and tested in a practical experiment and a comparison of both algorithms is assessed in terms of frequency nadir achieved, settling time and implementation complexity. The findings can give useful insights to help decide which algorithm should be implemented in a future real application. © 2018 Power Systems Computation Conference.

2017

Control of an isolated single-phase bidirectional AC-DC matrix converter for V2G applications

Authors
Varajão, D; Araújo, RE; Miranda, LM; Lopes, JP; Weise, ND;

Publication
Electric Power Systems Research

Abstract
This paper describes a new current control method that enhances the dynamic performance of a single-phase bidirectional AC-DC battery charger to provide a high-frequency link between the grid and electric vehicle. The single-stage structure and the bidirectional power flow make the matrix converter an attractive solution for electric vehicle (EV) battery charging applications in the context of smart grids. The operating principles and modulation method are analyzed and discussed in detail. Furthermore, a current controller improved with a Smith predictor is proposed to decrease the phase delay in the measurement of the average current in the battery pack. The SP reduces the rise time to around a third and the settling time to half when compared with a PI controller. Simulations and experimental results from a laboratory prototype are shown to verify the feasibility of the proposed control scheme. © 2017 Elsevier B.V.

2017

An overview on Preisach and Jiles-Atherton hysteresis models for soft magnetic materials

Authors
Melo, P; Araujo, RE;

Publication
IFIP Advances in Information and Communication Technology

Abstract
The design of efficient and high power density electrical machines needs an accurate characterization of magnetic phenomena. Core losses estimation is usually addressed by empirical models, where its lack of accuracy is well known. Hysteresis models are able to take an insight into the magnetic physical mechanisms. Compared to the empirical models, they contribute to a higher accuracy in modeling electromagnetic systems, including core losses estimation. At a macroscopic level, two models are often used: the Preisach and the Jiles– Atherton (J–A) models. This paper presents their basic formulation, as well the main limitations and scope of application. This is a first step to investigate the possible application of hysteresis models, in order to reach accurate core losses estimation in switched reluctance machines.

Supervised
thesis

2017

Sistema de sensorização e parametrização de um protótipo de veículo elétrico à escala  1:8

Author
Tiago Miguel da Silva Tavares

Institution
UP-FEUP

2017

Conversor eletrónico de potência para sistema híbrido de armazenamento de energia

Author
Gonçalo André Maio Dias

Institution
UP-FEUP

2017

Sistema de visão estéreo para identificação de obstáculos

Author
José Luís Dias Espassandim

Institution
UP-FEUP

2017

Diagnóstico de avarias em sistemas de conversão de energia eólica

Author
Márcia Alexandra Cabecinha Rodrigues

Institution
UP-FEUP

2016

Indoor Sound Based Localization

Author
João Neves Moutinho

Institution
UP-FEUP