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Power TranformersS Diagnosis: Status Evaluation
Nogueira, Teresa Alexandra Ferreira Mourão Pinto; Quadrado, José Carlos; Felgueiras, Manuel Carlos Malheiro de Carvalho; Lopes, Carlos SilvaThe reliability of the electrical grid depends on theavailability and performance of crucial components such aspower transformers. A failure in these expensive devicesthreatens supply energy warranty and system overhaulreliability. As transformers approach their end of life, thefailure rate tends to increase and, therefore, both equipmentdiagnostics and working condition assessment are importantto detect oncomi...
Output voltage quality evaluation of stand-alone four-leg inverters using linea...
Luís, Ricardo; Silva, José Fernando; Quadrado, José CarlosThis paper presents the design and experimental voltage quality evaluation of controllers for the output voltages of 3-phase four-leg voltage source inverters. These inverters are needed in stand-alone power systems to supply linear and non-linear, balanced or unbalanced loads with constant RMS value voltages at fixed frequency. Comparisons include closed loop outer voltage controllers based on predictive, slid...
A multicultural approach to teach sustainability
Caetano, Nídia Sá; Rocha, João; Quadrado, José Carlos; Cardoso, José Marílio; Felgueiras, CarlosGlobalization is a trend that covers all society perspectives in general, and higher education in particular. The main traditional objective of higher education institutions has been to prepare domestic students with a given set of skills. Research competition and University’s rankings, as well as the need to reach other publics, pushed them towards internationalization. The exchange of students across the EU i...
Teaching Sustainability in a Multicultural Environment
Caetano, Nídia Sá; Rocha, João; Quadrado, José Carlos; Cardoso, José Marílio; Felgueiras, CarlosNowadays sustainability is becoming extremely important and although the concept is perfectly established, there are different approaches to teach the fundamental aspects to be considered. Aiming at a higher level of internationalization and having in mind that students could gain from an intensive and multicultural experience ISEP organized its first Engineering for Sustainable Development (E4SD) Summer Course...
Controlo de actuadores electromecânicos com incremento de tolerância a defeitos
Gonçalves, Dora H. Avelar; Quadrado, José CarlosEste trabalho descreve um sistema de controlo e um método que permite o funcionamento de um motor eléctrico polifásico com tolerância a defeitos. Convencionalmente a redundância é conseguida à custa de enrolamentos complexos e topologia de inversores. O sistema de controlo proposto usa módulos de potência monofásicos em paralelo para fornecer energia a cada fase. Tirando partido dos circuitos magnéticos isolado...