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Dr. Rui Melicio
IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Portugal

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0 Mechatronics
0 Power Electronics
0 Renewable energies
0 Smart Grids
0 Power systems management and operation

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Power Electronics
Smart Grids

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Review
Published: 23 June 2021 in Electronics
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The hybrid three-phase rectifiers (HTR) consist of parallel associations of two rectifiers (rectifier 1 and rectifier 2), each one of them with a distinct operation, while the sum of their input currents forms a sinusoidal or multilevel waveform. In general, rectifier 1 is a GRAETZ (full bridge) (can be combined with a BOOST converter) and rectifier 2 is combined with a DC-DC converter. In this HTR contest, this paper is intended to answer some important questions about those hybrid rectifiers. To obtain the correct answers, the study is conducted as an analysis of a systematic literature review. Thus, a search was carried out in the databases, mostly IEEE and IET, and 34 papers were selected as the best corresponding to the HTR theme. It is observed that the preferred form of power distribution in unidirectional hybrid three-phase rectifiers (UHTR) is 55%Po (rectifier 1) and 45%Po (rectifier 2). For the bidirectional hybrid three-phase rectifiers (BHTR), rectifier 1 preferably takes 90% of Po and 10% of Po is processed by rectifier 2. It is also observed that the UHTR that employ the single-ended primary-inductor converter (SEPIC) or VIENNA converter topologies in rectifier 2 can present sinusoidal input currents with low total harmonic distortion (THD) and high Power Factor (PF), even successfully complying with the international standards. The same can be said about the rectifier that employs a pulse-width (PWM) converter of BOOST topology in rectifier 2. In short, the HTR are interesting because they allow using the GRAETZ full bridge topology in rectifier 1, thus taking advantage of its characteristics, being simple, robust, and reliable. At the same time, the advantages of rectifier 2, i.e., high PF and low THD, are well used. In addition, this article also points out the future direction of research that is still unexplored in the literature, thus giving opportunities for future innovation.

ACS Style

José Gonçalves; Stanimir Valtchev; Rui Melicio; Alcides Gonçalves; Frede Blaabjerg. Hybrid Three-Phase Rectifiers with Active Power Factor Correction: A Systematic Review. Electronics 2021, 10, 1520 .

AMA Style

José Gonçalves, Stanimir Valtchev, Rui Melicio, Alcides Gonçalves, Frede Blaabjerg. Hybrid Three-Phase Rectifiers with Active Power Factor Correction: A Systematic Review. Electronics. 2021; 10 (13):1520.

Chicago/Turabian Style

José Gonçalves; Stanimir Valtchev; Rui Melicio; Alcides Gonçalves; Frede Blaabjerg. 2021. "Hybrid Three-Phase Rectifiers with Active Power Factor Correction: A Systematic Review." Electronics 10, no. 13: 1520.

Journal article
Published: 07 June 2021 in Applied Sciences
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Nowadays, satellite images are used in many applications, and their automatic processing is vital. Conventional integer grey-scale edge detection algorithms are often used for this. This study shows that the use of color-based, fractional order edge detection may enhance the results obtained using conventional techniques in satellite images. It also shows that it is possible to find a fixed set of parameters, allowing automatic detection while maintaining high performance.

ACS Style

Manuel Henriques; Duarte Valério; Rui Melicio. Fractional Order Processing of Satellite Images. Applied Sciences 2021, 11, 5288 .

AMA Style

Manuel Henriques, Duarte Valério, Rui Melicio. Fractional Order Processing of Satellite Images. Applied Sciences. 2021; 11 (11):5288.

Chicago/Turabian Style

Manuel Henriques; Duarte Valério; Rui Melicio. 2021. "Fractional Order Processing of Satellite Images." Applied Sciences 11, no. 11: 5288.

Journal article
Published: 22 May 2021 in Sustainability
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This paper presents a computer application to assist in decisions about sustainability enhancement due to the effect of shifting demand from less favorable periods to periods that are more convenient for the operation of a microgrid. Specifically, assessing how the decisions affect the economic participation of the aggregating agent of the microgrid bidding in an electricity day-ahead market. The aggregating agent must manage microturbines, wind systems, photovoltaic systems, energy storage systems, and loads, facing load uncertainty and further uncertainties due to the use of renewable sources of energy and participation in the day-ahead market. These uncertainties cannot be removed from the decision making, and, therefore, require proper formulation, and the proposed approach customizes a stochastic programming problem for this operation. Case studies show that under these uncertainties and the shifting of demand to convenient periods, there are opportunities to make decisions that lead to significant enhancements of the expected profit. These enhancements are due to better bidding in the day-ahead market and shifting energy consumption in periods of favorable market prices for exporting energy. Through the case studies it is concluded that the proposed approach is useful for the operation of a microgrid.

ACS Style

Isaías Gomes; Rui Melicio; Victor Mendes. Assessing the Value of Demand Response in Microgrids. Sustainability 2021, 13, 5848 .

AMA Style

Isaías Gomes, Rui Melicio, Victor Mendes. Assessing the Value of Demand Response in Microgrids. Sustainability. 2021; 13 (11):5848.

Chicago/Turabian Style

Isaías Gomes; Rui Melicio; Victor Mendes. 2021. "Assessing the Value of Demand Response in Microgrids." Sustainability 13, no. 11: 5848.

Journal article
Published: 19 May 2021 in Aerospace
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This paper addresses a support information system for the planning of aircraft maintenance teams, assisting maintenance managers in delivering an aircraft on time. The developed planning of aircraft maintenance teams is a computer application based on a mathematical programming problem written as a minimization one. The initial decision variables are positive integer variables specifying the allocation of available technicians by skills to maintenance teams. The objective function is a nonlinear function balancing the time spent and costs incurred with aircraft fleet maintenance. The data involve technicians’ skills, hours of work to perform maintenance tasks, costs related to facilities, and the aircraft downtime cost. The realism of this planning entails random possibilities associated with maintenance workload data, and the inference by a procedure of Monte Carlo simulation provides a proper set of workloads, instead of going through all the possibilities. The based formalization is a nonlinear integer programming problem, converted into an equivalent pure linear integer programming problem, using a transformation from initial positive integer variables to Boolean ones. A case study addresses the use of this support information system to plan a team for aircraft maintenance of three lines under the uncertainty of workloads, and a discussion of results shows the serviceableness of the proposed support information system.

ACS Style

Duarte Pereira; Isaias Gomes; Rui Melicio; Victor Mendes. Planning of Aircraft Fleet Maintenance Teams. Aerospace 2021, 8, 140 .

AMA Style

Duarte Pereira, Isaias Gomes, Rui Melicio, Victor Mendes. Planning of Aircraft Fleet Maintenance Teams. Aerospace. 2021; 8 (5):140.

Chicago/Turabian Style

Duarte Pereira; Isaias Gomes; Rui Melicio; Victor Mendes. 2021. "Planning of Aircraft Fleet Maintenance Teams." Aerospace 8, no. 5: 140.

Journal article
Published: 24 February 2021 in Mathematics
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Many image processing algorithms make use of derivatives. In such cases, fractional derivatives allow an extra degree of freedom, which can be used to obtain better results in applications such as edge detection. Published literature concentrates on grey-scale images; in this paper, algorithms of six fractional detectors for colour images are implemented, and their performance is illustrated. The algorithms are: Canny, Sobel, Roberts, Laplacian of Gaussian, CRONE, and fractional derivative.

ACS Style

Manuel Henriques; Duarte Valério; Paulo Gordo; Rui Melicio. Fractional-Order Colour Image Processing. Mathematics 2021, 9, 457 .

AMA Style

Manuel Henriques, Duarte Valério, Paulo Gordo, Rui Melicio. Fractional-Order Colour Image Processing. Mathematics. 2021; 9 (5):457.

Chicago/Turabian Style

Manuel Henriques; Duarte Valério; Paulo Gordo; Rui Melicio. 2021. "Fractional-Order Colour Image Processing." Mathematics 9, no. 5: 457.

Journal article
Published: 13 February 2021 in Applied Sciences
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In this paper, a new way to mitigate the current interactions is proposed. The problem of current interactions arises when a modular three-phase (3-phase) rectifier (three single-phase modules) with boost converter for power factor correction (PFC) is used. A new differential-mode choke filter is implemented in the developed boost converter. The choke here is a specially made differential inductor in the input of the boost converter that eliminates the known current interactions. To prove the new concept, a study of the level of mitigation of the current interactions is presented. The control is operated in continuous driving mode (CCM), and the popular UC3854B circuit was used for this. The rectifier proposal is validated through a set of simulations performed on the PSIM 12.0 platform, as well as the construction of a prototype. With the results obtained, it is confirmed that the differential-mode choke filter eliminates the current interactions. It is observed that at the input of the rectifier, a sinusoidal alternating current with a low level of harmonic distortion is consumed from the grid. The sinusoidal shape of the phase current proves that a better power factor capable of meeting the international standards is obtained, and that the circuit in its initial version is operational. This proven result promises a good PFC operation, to guarantee the better quality of the electrical energy, being able to be applied in systems that require a high PFC, e.g., in battery charging, wind systems, or in aeronautics and spacecrafts.

ACS Style

José Teixeira Gonçalves; Stanimir Valtchev; Rui Melicio. Current Interactions Mitigation in 3-Phase PFC Modular Rectifier through Differential-Mode Choke Filter Boost Converter. Applied Sciences 2021, 11, 1684 .

AMA Style

José Teixeira Gonçalves, Stanimir Valtchev, Rui Melicio. Current Interactions Mitigation in 3-Phase PFC Modular Rectifier through Differential-Mode Choke Filter Boost Converter. Applied Sciences. 2021; 11 (4):1684.

Chicago/Turabian Style

José Teixeira Gonçalves; Stanimir Valtchev; Rui Melicio. 2021. "Current Interactions Mitigation in 3-Phase PFC Modular Rectifier through Differential-Mode Choke Filter Boost Converter." Applied Sciences 11, no. 4: 1684.

Journal article
Published: 11 February 2021 in Aerospace
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In the aviation sector, human factors are the primary cause of safety incidents. Intelligent prediction systems, which are capable of evaluating human state and managing risk, have been developed over the years to identify and prevent human factors. However, the lack of large useful labelled data has often been a drawback to the development of these systems. This study presents a methodology to identify and classify human factor categories from aviation incident reports. For feature extraction, a text pre-processing and Natural Language Processing (NLP) pipeline is developed. For data modelling, semi-supervised Label Spreading (LS) and supervised Support Vector Machine (SVM) techniques are considered. Random search and Bayesian optimization methods are applied for hyper-parameter analysis and the improvement of model performance, as measured by the Micro F1 score. The best predictive models achieved a Micro F1 score of 0.900, 0.779, and 0.875, for each level of the taxonomic framework, respectively. The results of the proposed method indicate that favourable predicting performances can be achieved for the classification of human factors based on text data. Notwithstanding, a larger data set would be recommended in future research.

ACS Style

Tomás Madeira; Rui Melício; Duarte Valério; Luis Santos. Machine Learning and Natural Language Processing for Prediction of Human Factors in Aviation Incident Reports. Aerospace 2021, 8, 47 .

AMA Style

Tomás Madeira, Rui Melício, Duarte Valério, Luis Santos. Machine Learning and Natural Language Processing for Prediction of Human Factors in Aviation Incident Reports. Aerospace. 2021; 8 (2):47.

Chicago/Turabian Style

Tomás Madeira; Rui Melício; Duarte Valério; Luis Santos. 2021. "Machine Learning and Natural Language Processing for Prediction of Human Factors in Aviation Incident Reports." Aerospace 8, no. 2: 47.

Conference paper
Published: 30 January 2021 in IOP Conference Series: Materials Science and Engineering
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This paper is about a computer application for planning maintenance of aircraft fleet in what regards allocation of skilled technicians. The formalization for this planning is a mathematical programming problem written as a minimizing one. The decision variables are the allocation of the skilled technicians. The data are the number of available technicians, the working hours needed to accomplish maintenance, the costs due to the daily operation of facilities, and due to the fleet downtime. Although, the formalization is of a non-linear integer-programming problem, a transformation of variables from positive integer ones to Boolean ones is conceivable and allows a reformulation as a pure integer linear programming problem. Also, a relaxation of the integer variables to continuous ones allows for a relaxed formulation as a convex non-linear programming problem. A case study of two fleets illustrates both formulations: solved by the pyomo library calling the GLPK for the pure linear integer programming problem and calling solvers in Scipy library for the relaxed formulation. An inference presented about the results of the case study addresses the issue of using nonlinear programming to emulate the solution of linear integer programming.

ACS Style

D P Pereira; R Melicio; V M F Mendes. A Team Allocation Decision for Aircraft Fleet Maintenance. IOP Conference Series: Materials Science and Engineering 2021, 1024, 012102 .

AMA Style

D P Pereira, R Melicio, V M F Mendes. A Team Allocation Decision for Aircraft Fleet Maintenance. IOP Conference Series: Materials Science and Engineering. 2021; 1024 (1):012102.

Chicago/Turabian Style

D P Pereira; R Melicio; V M F Mendes. 2021. "A Team Allocation Decision for Aircraft Fleet Maintenance." IOP Conference Series: Materials Science and Engineering 1024, no. 1: 012102.

Journal article
Published: 21 January 2021 in Applied Sciences
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This paper has resulted from a continued study of spacecraft material degradation and space debris formation. The design and implementation of a thermal vacuum cycling cryogenic facility for the evaluation of space debris generation at a low Earth orbit (LEO) is presented. The facility used for spacecraft external material evaluation is described, and some of the obtained results are presented. The infrastructure was developed in the framework of a study for the European Space Agency (ESA). The main purpose of the cryogenic facility is to simulate the LEO spacecraft environment, namely thermal cycling and vacuum ultraviolet (VUV) irradiation to simulate the spacecraft material degradation and the generation of space debris. In a previous work, some results under LEO test conditions showed the effectiveness of the cryogenic facility for material evaluation, namely: the degradation of satellite paints with a change in their thermo-optical properties, leading to the emission of cover flakes; the degradation of the pressure-sensitive adhesive (PSA) used to glue Velcro’s to the spacecraft, and to glue multilayer insulation (MLI) to the spacecraft’s. The paint flakes generated are space debris. Hence, in a scenario of space missions where a spacecraft has lost the thermal shielding capability, the failure of PSA tape and the loss of Velcro properties may contribute to the release of the full MLI blanket, contributing to the generation of space debris that presents a growing threat to space missions in the main Earth orbits.

ACS Style

Paulo Gordo; Tiago Frederico; Rui Melicio; António Amorim. Implementation of a Cryogenic Facility for Space Debris Analysis. Applied Sciences 2021, 11, 948 .

AMA Style

Paulo Gordo, Tiago Frederico, Rui Melicio, António Amorim. Implementation of a Cryogenic Facility for Space Debris Analysis. Applied Sciences. 2021; 11 (3):948.

Chicago/Turabian Style

Paulo Gordo; Tiago Frederico; Rui Melicio; António Amorim. 2021. "Implementation of a Cryogenic Facility for Space Debris Analysis." Applied Sciences 11, no. 3: 948.

Paper
Published: 01 January 2021 in IOP Conference Series: Materials Science and Engineering
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The Asteroid Impact & Deflection Assessment (AIDA) is a collaboration between the NASA DART mission and ESA Hera mission. The aim scope is to study the asteroid deflection through a kinetic collision. DART spacecraft will collide with Didymos-B, while ground stations monitor the orbit change. HERA spacecraft will study the post-impact scenario. The HERA spacecraft is composed by a main spacecraft and two small CubeSats. HERA will monitor the asteroid through cameras, Radar, Satellite-to-Satellite doppler tracking, LIDAR, seismometry and gravimetry. In this paper is reported the first iteration on the LIDAR ENGINEERING MODEL ALTIMETER named HELENA. HELENA is a TOF altimeter that provides time-tagged distances and velocity measurements. The LIDAR can be used for support near asteroid navigation and provides scientific information. The HELENA design comprises a microchip laser and low noise sensor. The synergies between these two technologies enable developing a compact instrument for range measurements of up to 14 km. Thermal-mechanical and radiometric simulations of the HELENA telescope are reported in this paper. The design is subjected to vibrational, static and thermal conditions, and it was possible to conclude by the results that the telescope is compliant with the random vibration levels, the static load and the operating temperatures.

ACS Style

Nicole G. Dias; Beltran N. Arribas; Paulo Gordo; Tiago Sousa; Joâo Marinho; Rui Melicio; António Amorim; Patrick Michel; Neo-Mapp Team. HERA Mission LIDAR Altimeter Implementation. IOP Conference Series: Materials Science and Engineering 2021, 1024, 012112 .

AMA Style

Nicole G. Dias, Beltran N. Arribas, Paulo Gordo, Tiago Sousa, Joâo Marinho, Rui Melicio, António Amorim, Patrick Michel, Neo-Mapp Team. HERA Mission LIDAR Altimeter Implementation. IOP Conference Series: Materials Science and Engineering. 2021; 1024 (1):012112.

Chicago/Turabian Style

Nicole G. Dias; Beltran N. Arribas; Paulo Gordo; Tiago Sousa; Joâo Marinho; Rui Melicio; António Amorim; Patrick Michel; Neo-Mapp Team. 2021. "HERA Mission LIDAR Altimeter Implementation." IOP Conference Series: Materials Science and Engineering 1024, no. 1: 012112.

Journal article
Published: 12 December 2020 in Applied Sciences
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Due to the increasing necessity for electrical demand, the microgrids (MGs) based on distributed generations (DGs) within power electronic interfaces are being extended to improve the traditional network control. One of the common ways to achieve power sharing among the resources on an islanding MG is to use the droop control approach, performing based on proportional-integrator (PI) controllers. However, due to the effect of feeder impedance, obtaining the reactive power sharing using this method is not accurate and leads to overload in some DGs, resulting in the output terminal voltage of each DG going outside of the allowable range. The second problem arises when the frequency measurement is not performed precisely, leading to inaccurate active power sharing, which can be solved by using an improved phase locked loop (PLL). Therefore, the purpose of this paper is to propose an applicable and simple approach based on the use of conventional droop characteristics and a proportional-resonant (PR) controller in a DG control system. Due to the load changes in the microgrid and other contingencies, the proposed PLL-based controller is able to represent supreme performance with low error in several case studies.

ACS Style

Ahmad Zare; Mazda Moattari; Rui Melicio. Distributed Generation Control Using Modified PLL Based on Proportional-Resonant Controller. Applied Sciences 2020, 10, 8891 .

AMA Style

Ahmad Zare, Mazda Moattari, Rui Melicio. Distributed Generation Control Using Modified PLL Based on Proportional-Resonant Controller. Applied Sciences. 2020; 10 (24):8891.

Chicago/Turabian Style

Ahmad Zare; Mazda Moattari; Rui Melicio. 2020. "Distributed Generation Control Using Modified PLL Based on Proportional-Resonant Controller." Applied Sciences 10, no. 24: 8891.

Journal article
Published: 08 December 2020 in Energies
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This paper investigates the feasibility of using the three-dimensional omnidirectional inductive channel for power transfer and as a power line communication (PLC) for ground-based vehicle, electric air vehicle, or space applications. The simulation results were performed by the advanced design system software using lumped equivalent circuit model. The power transfer efficiency was determined based on multiport scattering (S)-parameters numerical simulation results while the theoretical channel capacity was calculated based on Matlab software as a function of the coupling coefficient considering an additive white Gaussian noise. Furthermore, the magnetic field distribution was evaluated as function of the misalignment angle θ between the receiver and the three orthogonal transmitters coils.

ACS Style

Safa Zouaoui; Wael Dghais; Rui Melicio; Hamdi Belgacem. Omnidirectional WPT and Data Communication for Electric Air Vehicles: Feasibility Study. Energies 2020, 13, 6480 .

AMA Style

Safa Zouaoui, Wael Dghais, Rui Melicio, Hamdi Belgacem. Omnidirectional WPT and Data Communication for Electric Air Vehicles: Feasibility Study. Energies. 2020; 13 (24):6480.

Chicago/Turabian Style

Safa Zouaoui; Wael Dghais; Rui Melicio; Hamdi Belgacem. 2020. "Omnidirectional WPT and Data Communication for Electric Air Vehicles: Feasibility Study." Energies 13, no. 24: 6480.

Review
Published: 21 November 2020 in Applied Sciences
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In recent years, power grid infrastructures have been changing from a centralized power generation model to a paradigm where the generation capability is spread over an increasing number of small power stations relying on renewable energy sources. A microgrid is a local network including renewable and non-renewable energy sources as well as distributed loads. Microgrids can be operated in both grid-connected and islanded modes to fill the gap between the significant increase in demand and storage of electricity and transmission issues. Power electronics play an important role in microgrids due to the penetration of renewable energy sources. While microgrids have many benefits for power systems, they cause many challenges, especially in protection systems. This paper presents a comprehensive review of protection systems with the penetration of microgrids in the distribution network. The expansion of a microgrid affects the coordination and protection by a change in the current direction in the distribution network. Various solutions have been suggested in the literature to resolve the microgrid protection issues. The conventional coordination of the protection system is based on the time delays between relays as the primary and backup protection. The system protection scheme has to be changed in the presence of a microgrid, so several protection schemes have been proposed to improve the protection system. Microgrids are classified into different types based on the DC/AC system, communication infrastructure, rotating synchronous machine or inverter-based distributed generation (DG), etc. Finally, we discuss the trend of future protection schemes and compare the conventional power systems.

ACS Style

Jalal Sahebkar Farkhani; Mohammad Zareein; Arsalan Najafi; Rui Melicio; Eduardo M. G. Rodrigues. The Power System and Microgrid Protection—A Review. Applied Sciences 2020, 10, 8271 .

AMA Style

Jalal Sahebkar Farkhani, Mohammad Zareein, Arsalan Najafi, Rui Melicio, Eduardo M. G. Rodrigues. The Power System and Microgrid Protection—A Review. Applied Sciences. 2020; 10 (22):8271.

Chicago/Turabian Style

Jalal Sahebkar Farkhani; Mohammad Zareein; Arsalan Najafi; Rui Melicio; Eduardo M. G. Rodrigues. 2020. "The Power System and Microgrid Protection—A Review." Applied Sciences 10, no. 22: 8271.

Journal article
Published: 19 October 2020 in Energies
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This paper is about the problem of the management of an aggregator of electric vehicles participating in an electricity market environment. The problem consists in the maximization of the expected profit through a formulation given by a stochastic programming problem to consider the uncertainty faced by the aggregator. This uncertainty is due to the day-ahead market prices and the driving requirements of the owners of the vehicles. Depending on the consent of the owners, inflexible charging to flexible charging is considered. Thus, the aggregator can propose different profiles and charging periods to the owners of electric vehicles. Qualitatively, as expected, the more flexible the vehicle owners, the higher the expected profit. The formulation, however, offers more to the aggregator and provides the ability to quantify the influence of consent of favorable driving requirements in the expected profit, allowing the aggregator to consider rewarding the owners of vehicles with more flexibility. Case studies addressed are for comparison of the influence of owners having inflexibility, partial flexibility, or flexibility in the expected profit of the aggregator.

ACS Style

Isaias Gomes; Rui Melicio; Victor Mendes. Comparison between Inflexible and Flexible Charging of Electric Vehicles—A Study from the Perspective of an Aggregator. Energies 2020, 13, 5443 .

AMA Style

Isaias Gomes, Rui Melicio, Victor Mendes. Comparison between Inflexible and Flexible Charging of Electric Vehicles—A Study from the Perspective of an Aggregator. Energies. 2020; 13 (20):5443.

Chicago/Turabian Style

Isaias Gomes; Rui Melicio; Victor Mendes. 2020. "Comparison between Inflexible and Flexible Charging of Electric Vehicles—A Study from the Perspective of an Aggregator." Energies 13, no. 20: 5443.

Journal article
Published: 15 July 2020 in Renewable Energy
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This paper presents the identification, development and simulation of a complex order, third generation CRONE (Commande Robuste d’Ordre Non Entier) controller for a new Darrieus type vertical-axis wind turbine design. A prototype of this wind turbine was developed and tested in a wind tunnel. Data acquired in the tests were used to develop and validate an accurate model. The CRONE control system design methodology was then used to develop a robust controller, which was tested in simulation. Simulations allow for parameter uncertainty in different wind conditions, with and without the presence of turbulence. This control system can be easily implemented using a micro-controller.

ACS Style

Francisco Ravasco; Rui Melicio; Nelson Batista; Duarte Valério. A wind turbine and its robust control using the CRONE method. Renewable Energy 2020, 160, 483 -497.

AMA Style

Francisco Ravasco, Rui Melicio, Nelson Batista, Duarte Valério. A wind turbine and its robust control using the CRONE method. Renewable Energy. 2020; 160 ():483-497.

Chicago/Turabian Style

Francisco Ravasco; Rui Melicio; Nelson Batista; Duarte Valério. 2020. "A wind turbine and its robust control using the CRONE method." Renewable Energy 160, no. : 483-497.

Journal article
Published: 07 July 2020 in Aerospace Science and Technology
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This paper is on the study of the Equilibria of a Gyrostat Satellite on a Circular Orbit when its angular momentum it's not aligned with any principal axis or when the angular momentum is not aligned with orbital coordinate frame stated in this paper as the general case. This study is conducted to achieve through the use of Euler angles which are developed into achieving through the use of the Resultant method a unique polynomial equation in function of four adimensional parameters, which its roots are directly proportional to the number of equilibria positions. Through the development of the algorithm and the analysis of the equilibria positions it was achieved a simple analytic expression for the same number of equilibria positions. It was also verified the existence of small regions of equilibria out of their main area near when the angular momentum is in a principal plane as expected to be found when the angular momentum is in a principal plane.

ACS Style

Luis F.M.M. Santos; Rui Melicio. Bifurcation of equilibria for general case of gyrostat satellite on a circular orbit. Aerospace Science and Technology 2020, 105, 106058 .

AMA Style

Luis F.M.M. Santos, Rui Melicio. Bifurcation of equilibria for general case of gyrostat satellite on a circular orbit. Aerospace Science and Technology. 2020; 105 ():106058.

Chicago/Turabian Style

Luis F.M.M. Santos; Rui Melicio. 2020. "Bifurcation of equilibria for general case of gyrostat satellite on a circular orbit." Aerospace Science and Technology 105, no. : 106058.

Journal article
Published: 28 May 2020 in Journal of Sensor and Actuator Networks
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This paper presents a traffic light system based on wireless communication that provides a support infrastructure for intelligent control in the context of smart cities and aerotropolis areas. An aerotropolis is a metropolitan subregion with an infrastructure centered an airport. Traffic intensity is increasing all over the world. Intelligent dynamic traffic light system control is being sought to replace classic conventional manual and time-based systems. In this work, a wireless sensor network is designed and implemented to feed real-time data into an intelligent traffic light system control. A physical prototype is implemented for experimental validation outside the laboratory environment. The physical prototype shows robustness against unexpected issues and local failures. The results are positive in terms of the scope of experience gained, and there is potential for these tests to be extended to larger areas.

ACS Style

João Cunha; Nelson Batista; Carlos Cardeira; Rui Melicio. Wireless Networks for Traffic Light Control on Urban and Aerotropolis Roads. Journal of Sensor and Actuator Networks 2020, 9, 26 .

AMA Style

João Cunha, Nelson Batista, Carlos Cardeira, Rui Melicio. Wireless Networks for Traffic Light Control on Urban and Aerotropolis Roads. Journal of Sensor and Actuator Networks. 2020; 9 (2):26.

Chicago/Turabian Style

João Cunha; Nelson Batista; Carlos Cardeira; Rui Melicio. 2020. "Wireless Networks for Traffic Light Control on Urban and Aerotropolis Roads." Journal of Sensor and Actuator Networks 9, no. 2: 26.

Journal article
Published: 22 May 2020 in Sustainable Energy, Grids and Networks
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This paper is about the dust effect impact on photovoltaic systems on the profit of an electricity market agent acting as an aggregator of photovoltaic power, wind power, thermal power, and an energy storage system. Energy storage ensures arbitrage and smoothing of the variability of photovoltaic power and wind power. The market agent intends to derive bids for submission in a day-ahead market, having consideration of the dust effect impact on the photovoltaic power. A formulation is proposed for a support decision system by a profit-based unit commitment problem solved by a stochastic programming approach, considering the operating characteristics of the virtual power plant. The photovoltaic power, wind power, and market price uncertainties are input data derived from scenarios of historical data. Case studies addressed show the advantages of the stochastic programming approach and insights concerned with the integration of uncertainties within the modeling for the schedule of the energy storage system and the dust effect impact on profit.

ACS Style

I.L.R. Gomes; R. Melicio; V.M.F. Mendes. Dust effect impact on PV in an aggregation with wind and thermal powers. Sustainable Energy, Grids and Networks 2020, 22, 100359 .

AMA Style

I.L.R. Gomes, R. Melicio, V.M.F. Mendes. Dust effect impact on PV in an aggregation with wind and thermal powers. Sustainable Energy, Grids and Networks. 2020; 22 ():100359.

Chicago/Turabian Style

I.L.R. Gomes; R. Melicio; V.M.F. Mendes. 2020. "Dust effect impact on PV in an aggregation with wind and thermal powers." Sustainable Energy, Grids and Networks 22, no. : 100359.

Conference paper
Published: 29 April 2020 in Collaboration in a Hyperconnected World
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The thesis focuses on the study of the electrical component of the electromagnetic field, radiated by the wireless energy transfer system into the adjacent environment. The wireless energy transfer and the wireless data transfer are studied simultaneously, focusing on the appropriate wireless communication channel between the transmitter and the receiver, so to make that channel improved. An implementation of a wireless energy transfer experimental prototype that operates simultaneously with a wireless data transmission is assembled. A computational application that allows tuning the operational frequency of the prototype to correspond to the resonant mode operation is developed.

ACS Style

Elena N. Baikova; R. Melicio; S. S. Valtchev. Study of Electric Field Emissions in Wireless Energy Transfer. Collaboration in a Hyperconnected World 2020, 233 -245.

AMA Style

Elena N. Baikova, R. Melicio, S. S. Valtchev. Study of Electric Field Emissions in Wireless Energy Transfer. Collaboration in a Hyperconnected World. 2020; ():233-245.

Chicago/Turabian Style

Elena N. Baikova; R. Melicio; S. S. Valtchev. 2020. "Study of Electric Field Emissions in Wireless Energy Transfer." Collaboration in a Hyperconnected World , no. : 233-245.

Conference paper
Published: 29 April 2020 in Collaboration in a Hyperconnected World
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This paper addresses the scenario reduction for stochastic optimization applied to short-term trading of photovoltaic (PV) power. Stochastic optimization becomes a useful technique when leading with problems involving uncertainty. Short-term trading of PV power in electricity markets is an example of a problem involving a high level of uncertainty, namely uncertain parameters as PV power and market prices. As the level of uncertainty raises and the optimization problem becomes more complex, the prerequisite of scenario reduction becomes crucial without losing the representativeness of the original scenarios. Thus, in this paper is proposed an effective scenario reduction algorithm based on backward method in order to obtain a profitable trading of PV power in electricity markets. The scenario reduction method is applied to a two-period scenario tree, i.e., a scenario fan including uncertainty on day-ahead market (DAM) prices, on imbalance prices and on PV power. Through a case study is analyzed the performance of the scenario reduction algorithm and the comparison with the original set of scenarios. The results show that the reduced set of scenarios still has a very high level of accuracy.

ACS Style

Isaias L. R. Gomes; Rui Melicio; Victor M. F. Mendes. Scenario Reduction for Stochastic Optimization Applied to Short-Term Trading of PV Power. Collaboration in a Hyperconnected World 2020, 246 -255.

AMA Style

Isaias L. R. Gomes, Rui Melicio, Victor M. F. Mendes. Scenario Reduction for Stochastic Optimization Applied to Short-Term Trading of PV Power. Collaboration in a Hyperconnected World. 2020; ():246-255.

Chicago/Turabian Style

Isaias L. R. Gomes; Rui Melicio; Victor M. F. Mendes. 2020. "Scenario Reduction for Stochastic Optimization Applied to Short-Term Trading of PV Power." Collaboration in a Hyperconnected World , no. : 246-255.