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Publications

Publications by CPES

2018

Data Economy for Prosumers in a Smart Grid Ecosystem

Authors
Bessa, RJ; Rua, D; Abreu, C; Machado, P; Andrade, JR; Pinto, R; Goncalves, C; Reis, M;

Publication
E-ENERGY'18: PROCEEDINGS OF THE 9TH ACM INTERNATIONAL CONFERENCE ON FUTURE ENERGY SYSTEMS

Abstract
Smart grids technologies are enablers of new business models for domestic consumers with local flexibility (generation, loads, storage) and where access to data is a key requirement in the value stream. However, legislation on personal data privacy and protection imposes the need to develop local models for flexibility modeling and forecasting and exchange models instead of personal data. This paper describes the functional architecture of an home energy management system (HEMS) and its optimization functions. A set of data-driven models, embedded in the HEMS, are discussed for improving renewable energy forecasting skill and modeling multi-period flexibility of distributed energy resources.

2018

Data Economy for Prosumers in a Smart Grid Ecosystem

Authors
Bessa, RJ; Rua, D; Abreu, C; Machado, P; Andrade, JR; Pinto, R; Gonçalves, C; Reis, M;

Publication
Proceedings of the Ninth International Conference on Future Energy Systems, e-Energy 2018, Karlsruhe, Germany, June 12-15, 2018

Abstract

2018

Influence of Crowbar and Chopper Protection on DFIG during Low Voltage Ride Through

Authors
Monteiro Pereira, RMM; Pereira, AJC; Ferreira, CM; Maciel Barbosa, FPM;

Publication
ENERGIES

Abstract
The energy sector is evolving rapidly, namely due to the increasing importance of renewable energy sources. The connection of large amounts of wind power generation poses new challenges for the dynamic voltage stability analysis of an electric power system, which has to be studied. In this paper, the traditional Doubly-Fed Induction Generator model is employed. Based on this model, a crowbar and chopper circuit is set up to protect the turbine during the short-circuit period. The EUROSTAG software package was used for the simulation studies of the system, and numerical results were obtained. Conclusions are drawn that provide a better understanding of the influence of crowbar and chopper protection on Doubly-Fed Induction Generators (DFIG), during low voltage ride through, in a system with wind power generation.

2018

Application of virtual reality tools in the teaching of concepts in projects of fast loading stations

Authors
Travassos Valdez, MT; Machado Ferreira, CM; Maciel Barbosa, FPM;

Publication
2018 28TH EAEEIE ANNUAL CONFERENCE (EAEEIE)

Abstract
The classroom will always present great challenges to the teachers. It is important to know how to provide learning to a new generation of students and to try to understand how students learn today. Each student arrives at school with a diversity of knowledge resulting from their own life experience, probably divergent from that of their colleagues. On the other hand, the domain of the new Information and Communication Technologies (ICTs) is part of their own experience. The teacher/student relationship is becoming more and digital and, therefore, the limitations of space are more and more reduced. ICTS have greatly altered the way students have access to knowledge, how they share it or how they simply organize the work. Thus, traditional pedagogical strategies and processes must integrate technologies, as a way to apply new work methodologies that value the students' reflection and critical thinking. In return, technology will bring them closer to knowledge, increasing their autonomy and consequent motivation. This work aimed at introducing the topic of sustainable mobility, so that electric vehicles become a growing reality in everyday life. A power generation system was proposed using a grid of photovoltaic panels, which in turn will allow the sustained feeding of a quick charging station. The surplus of electricity produced by the grid of panels can be used to meet the energy needs of a service station. A varied range of software tools were used to address the challenge. This article aims at discussing the use of different software in the educational environment, highlighting the advantages, as well as the difficulties associated with the approach. Several educational software types were used in the final project of a master's degree in ISEC (Instituto Superior de Engenharia de Coimbra). Software tools are an effective way to train students. The use of virtual reality tools in concept teaching of fast charging stations was quite effective in the improvement of students.

2018

Comparative study of TCSC and SVC performance on Dynamic Voltage Stability of an Electric Power System

Authors
Monteiro Pereira, RMM; Pereira, AJC; Machado Ferreira, CMM; Maciel Barbosa, FPM;

Publication
2018 53RD INTERNATIONAL UNIVERSITIES POWER ENGINEERING CONFERENCE (UPEC)

Abstract
In this paper it is presented the study of the effect of Thyristor Controlled Series Compensation (TCSC) and Static Var Compensators (SVC) devices on voltage collapse phenomenon in power systems to increase system loadability. Comparative studies of TCSC and SVC performance on Dynamic Voltage Stability of an Electric Power System are presented. The models of TCSC and SVC were developed in EUROSTAG. The Automatic Voltage Regulators (AVR) of the generating units and the turbine speed governors were modelled in detail. Different load models were used and the Under Load Tap Changers (ULTC) were also taken into account. Finally, some conclusions that provide a better understanding of the dynamic voltage stability using Flexible AC transmission System (FACTS) devices during a disturbance are pointed out.

2018

Implementation of methodological strategies, attitudes and instruments as a PBL resource

Authors
Valdez, MT; Ferreira, CM; Barbosa, FPM;

Publication
2018 17th International Conference on Information Technology Based Higher Education and Training, ITHET 2018

Abstract
The evolution of knowledge, where intellectual development and adaptive skills are required, has rendered the traditional rigid curricula and teaching methodologies outdated. Education and training must be acquired throughout life, hence the need to change the teaching-learning processes. The Bologna Process introduced new paradigms that resulted in curricula revisions, the reorganization of teaching-learning processes, the structuring of courses and curricular units. It shifted the teaching process to a new form that enhances and assesses the acquisition of learning skills based on the work performed by the students. It is student-centered teaching, where it is essential to define the intended levels of knowledge, how the students achieve them, and if they reach the necessary skills in each of those levels. Each student needs to be motivated to learn and to participate in the activities, which presupposes meaningful activities to arouse the interest in developing them. The purpose of this paper is to describe a design project, its implementation, orientation and effectiveness in problem-based learning (PBL). Another purpose is the establishment of a relationship between the Bologna process and the implicit implications in the structure of teaching and training in lighting projects. This paper presents a proposal of the use of Information and Communication Technologies (ICT) using DIALux evo software. It is part of the learning methodology, supported by computer simulation for lighting projects, in the Electrical Installation and Lighting Engineering Master's Degree in Service Engineering of Construction, 1st semester of the 1st year, in the Department of Electrical Engineering of the Institute of Engineering of Coimbra (ISEC). PBL combined with Flipped Classroom is used as a pedagogical strategy to enable higher education students to approach problems, in groups and with the supervision of a teacher, in order to acquire specialized knowledge. The implementation of the PBL method aimed at bringing education and learning closer to the professional reality of the future engineers. © 2018 IEEE.

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