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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
002
Publications

2018

Modulation Strategy for a Single-stage Bidirectional and Isolated AC-DC Matrix Converter for Energy Storage Systems

Authors
Varajao, D; Araujo, RE; Miranda, LM; Pecas Lopes, JAP;

Publication
IEEE Transactions on Industrial Electronics

Abstract
This paper presents a new modulation and control strategies for high-frequency link matrix converter. The proposed method aims to achieve controllable power factor in the grid interface as well voltage and current regulation for a battery energy storage device. The matrix converter is a key element of the system, since performs a direct AC to AC conversion between the grid and the power transformer, dispensing the traditional DC-link capacitors. Therefore, the circuit volume and weight are reduced and a longer service life is expected when compared with the existing technical solutions. A prototype was built to validate the mathematical analysis and the simulation results. Experimental tests developed in this research show the capability to control the grid currents in the synchronous reference frame in order to provide grid services. Simultaneously, the battery current is well regulated with small ripple which makes this converter ideal for battery charging of electric vehicles and energy storage applications. IEEE

2018

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

Authors
Lopes, A; Araujo, 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.

2018

EMI Filter Design for a Single-stage Bidirectional and Isolated AC–DC Matrix Converter

Authors
Varajao, D; Araujo, RE; Miranda, LM; Pecas Lopes, JAP;

Publication
Electronics

Abstract
This paper describes the design of an electromagnetic interference (EMI) filter for the high-frequency link matrix converter (HFLMC). The proposed method aims to systematize the design process for pre-compliance with CISPR 11 Class B standard in the frequency range 150 kHz to 30 MHz. This approach can be extended to other current source converters which allows time-savings during the project of the filter. Conducted emissions are estimated through extended simulation and take into account the effect of the measurement apparatus. Differential-mode (DM) and common-mode (CM) filtering stages are projected separately and then integrated in a synergistic way in a single PCB to reduce volume and weight. A prototype of the filter was constructed and tested in the laboratory. Experimental results with the characterization of the insertion losses following the CISPR 17 standard are provided. The attenuation capability of the filter was demonstrated in the final part of the paper.

Supervised
thesis

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

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

2016

Fault tolerant control with actuator failure detection for a multi motor electric vehicle

Author
Bruno Laranjo dos Santos

Institution
UP-FEUP