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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
005
Publications

2022

Improvement of Steady State Performance of Voltage Control in Switched Reluctance Generator: Experimental Validation

Authors
Touati, Z; Pereira, M; Araujo, RE; Khedher, A;

Publication
Machines

Abstract
This paper presents a voltage control approach to a Switched Reluctance Generator (SRG) using a Proportional Integral (PI) controller. The principle of operation is described and the considerations in the design of controller are discussed. A current loop transfer function of an SRG with power converter has been systematically derived in order to obtain a small-signal model for the generator. The generated voltage is controlled by manipulation of the setpoint of the current control of the generator. The entire voltage loop controller and current control have been simulated and tested with a 250 W SRG prototype. The control law of the control system was implemented on a digital signal processor (TMS320F28379D). To verify the feasibility of the proposed voltage control, the performances are evaluated by numerical simulations and experimental tests with an 8/6 SRG for different rotational speeds and resistive loads. Experimental results demonstrate that the DC output voltage from SRG can be controlled well using a simple linear controller.

2021

Modulation Methods for Direct and Indirect Matrix Converters: A Review

Authors
Varajao, D; Araujo, RE;

Publication
ELECTRONICS

Abstract
Matrix converters (MCs) allow the implementation of single-stage AC/AC power conversion systems (PCS) with inherent bidirectional power flow capability. By avoiding the typical DC-link capacitor, MCs have the potential to achieve higher power density with a more reliable operation and less maintenance when compared with conventional two-stage AC/DC/AC PCS. For these reasons, matrix converters have been receiving significant attention from the academic sector but have not yet been implemented on a large industrial scale. This article reviews the Direct Matrix Converter (DMC) and the Indirect Matrix Converter (IMC) along with the respective actual and most important modulation methods. Simulation results are provided to validate the theoretical analysis and to get a deep insight about the implementation of space vector modulation (SVM) and respective switching pattern generator.

2021

Multi-Layer Control for Hybrid Balancing Systems

Authors
De Castro, R; Pereira, H; Araujo, RE; Barreras, JV; Pangborn, HC;

Publication
2021 IEEE Conference on Control Technology and Applications (CCTA)

Abstract

2021

Feasibility of Utilizing Photovoltaics for Irrigation Purposes in Moamba, Mozambique

Authors
Mindu, AJ; Capece, JA; Araujo, RE; Oliveira, AC;

Publication
SUSTAINABILITY

Abstract
Agriculture plays a significant role in the labor force and GDP of Mozambique. Nonetheless, the energy source massively used for water pumping in irrigation purposes is based on fossil fuels (diesel oil). Despite the water availability and fertile soils in Moamba, Mozambique, farmers struggle with the high cost of fuels used in the pumping systems. This study was sought to analyze the feasibility of utilizing a solar photovoltaic system as a means to reduce the environmental impact caused by the diesel pumps and simultaneously alleviate the expenses regarding the use of non-environmentally friendly technologies. Site observations and interviews were undertaken in order to obtain local data regarding the water demand, current energy systems costs and distances from the source to the irrigated fields. CLIMWAT 2.0 was used for climate data acquisition and analysis. The environmental benefits, the cost effectiveness and local climate conditions show that the PV system is feasible in Moamba. Furthermore, parameters such as hydraulic energy, incident solar energy, pump efficiency and total system efficiency were used to predict the performance of the system. The results obtained are important to analyze the implementation of such energy systems.

2021

Simulation analysis of a control system for a Solid-State Transformer

Authors
Marques, MJ; Araújo, RE;

Publication
2021 International Young Engineers Forum (YEF-ECE)

Abstract

Supervised
thesis

2021

Conversor CC/CC bidireccional em corrente para sistemas híbridos de armazenamento de energia

Author
Bruno Alexandre Borges Gonçalves

Institution
UP-FEUP

2021

Time management through indoor location

Author
André Costa Teixeira

Institution
UP-FEUP

2021

Desenvolvimento da aplicação cliente para sistema de localização “indoor” usando Audio-GPS

Author
Hugo Filipe Marques Pereira

Institution
UP-FEUP

2021

Desenvolvimento de um sistema de armazenamento de energia elétrica para aplicação em Pavement Energy Harvesting

Author
Rúben Samuel de Matos Lopes

Institution
UP-FEUP

2021

Data-Driven State Estimation Algorithms for a 48V Battery Management System

Author
Pedro Gabriel Araújo Monteiro

Institution
UP-FEUP