Dr. João Fernandes
Instituto Superior Técnico, University of Lisbon, Portugal
+1
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Academic Career Length
13Years (2014-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications1 February 2018 in Applied Energy
Journal Article
29 February 2016 in IEEE Transactions on Industrial Electronics
Journal Article
João Fernandes
Paulo BrancoThis paper analyzes the electromechanical characteristics of a novel shell-like spherical induction machine with multiple degrees-of-freedom (DOF), formed by a shell stator and a spherical hollow rotor. The shell-like induction machine is evaluated using n-harmonic analytical models for its electromechanical characteristics. The electromechanical model includes the distribution of the copper windings in the stator slots, incorporating the currents harmonic content to describe its spatial distribution. The distribution of the magnetic potential vector and the components of the magnetic flux density are computed using the real source-current distribution. A small prototype was built to validate the analytical model. To do so, experimental tests were done to the magnetic flux density and the torque. The shell-like induction motor is concretized as traction motor in an electric wheel-chair. Its results are compared with a finite-element analysis tool.
Journal Article
Andrés A. ZúñigaABAlexandre Baleia
Alexandre BaleiaJoão FernandesPaulo BrancoReliability assessment in traditional power distribution systems has played a key role in power system planning, design, and operation. Recently, new information and communication technologies have been introduced in power systems automation and asset management, making the distribution network even more complex. In order to achieve efficient energy management, the distribution grid has to adopt a new configuration and operational conditions that are changing the paradigm of the actual electrical system. Therefore, the emergence of the cyber-physical systems concept to face future energetic needs requires alternative approaches for evaluating the reliability of modern distribution systems, especially in the smart grids environment. In this paper, a reliability approach that makes use of failure modes of power and cyber network main components is proposed to evaluate risk analysis in smart electrical distribution systems. We introduce the application of Failure Modes and Effects Analysis (FMEA) method in future smart grid systems in order to establish the impact of different failure modes on their performance. A smart grid test system is defined and failure modes and their effects for both power and the cyber components are presented. Preventive maintenance tasks are proposed and systematized to minimize the impact of high-risk failures and increase reliability.
Journal Article
This paper investigates the influence of the spectral irradiance variation and the spectral response (SR) on the production of energy by photovoltaic cells. To determine the impact of SR and spectral irradiance on m-Si and perovskite cells, experimental tests were conducted outdoors, used optical filters to select different zones of the spectrum. For the computational simulations of the different photovoltaic modules, when subjected to a certain spectral irradiance, a model with spectral factor (SF) was implemented. The SF model accurately simulated the experiments performed for the high-pass filters. The highest relative errors for certain irradiation bands occurred due to the input variables used in the model, which did not fully describe the reality of the experiments performed. The effect of the SR and the spectral irradiance for each of them were observed through the simulations for the m-Si, a-Si, CdTe, and copper indium selenide (CIS) modules. The CIS technology presented a better overall result in the near infrared zone, producing about half of the energy produced by the CdTe technology in the visible zone. The SF, spectral incompatibility factor (MM), and spectral effective responsivity (SEF) parameters were verified to be important for studying the photovoltaic energy production.
1 December 2017 in Applied Energy
Journal Article
BCBernardo Capelo
Bernardo Capelo
Modesto Pérez-SánchezJoão FernandesHRHelena M. Ramos
Helena M. Ramos
PLP. Amparo López-Jiménez
P. Amparo López-Jiménez
Paulo Branco1 August 2019 in Solar Energy
Journal Article
PAPedro Alves
Pedro Alves
João FernandesJTJoão Paulo N. Torres
João Paulo N. TorresPaulo BrancoCFCarlos Fernandes
Carlos Fernandes
JGJoão Gomes
João Gomes
About Me
Prof. Dr. João F.P. Fernandes received a Ph.D. in electrical and computer engineering from Instituto Superior Técnico, Universidade de Lisboa, in 2017. From 2006 to 2013, he was a managing partner at Emove, Innovative Technologies, Lda, and an electrical engineer at Efacec, Engenharia e Sistemas. Since 2018, he has been an Assistant Professor with the Department of Electrical and Computer Engineering, Scientific Area of Energy, of Instituto Superior Técnico, Universidade de Lisboa. His research interests include the development of new machine designs, the application of new materials in electrical machines, such as soft composites and superconducting materials, and the development of hybrid field computing tools. He has published several works in these areas, in international refereed journals and conferences. He is currently the PI of a national research project, was the PI of IST of the European project SEMS4USV from Frontex, and was a researcher at one PRR project and one research project with the Portuguese Army. He is an Associate Editor at IEEE Trans. on Energy Conversion (IEEE, 2023–2024) and was a Guest Editor of the special issues Superconductors and Magnetic Materials (Crystals, 2023–2024), Future Generation Electric Machines and Drives (MDPI, 2022–2023), Electrical Machine Design 2020, Electrical Machine Design 2021 (Energies, 2020–2022), and Advanced Manufacturing and Materials for Next-Generation Electrical Machines (Energies, 2022–2023).