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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2011 / Made available in DSpace on 2012-10-25T21:30:53Z (GMT). No. of bitstreams: 1 297024.pdf: 16024434 bytes, checksum: b77841cad08b1e2627efc11beb3f5227 (MD5) / Este trabalho apresenta uma síntese de diversos métodos de proteção de anti-ilhamento residentes no conversor eletrônico aplicado a sistemas de geração distribuída utilizando tecnologia solar fotovoltaica. É realizado um estudo minucioso dos vários métodos conhecidos passivos e ativos presentes na literatura. É feita a escolha do método passivo de detecção por frequência e tensão e detecção por salto de fase de tensão para aplicação no desenvolvimento do trabalho. Também é realizada a sua implementação em um conversor monofásico de 1kW de estrutura ponte-completa operando em modo de injeção decorrente na rede elétrica. É executado seu estudo por simulação numérica utilizando o software PSIM. Por fim, é montado o protótipo e, consequentemente, realizado os respectivos ensaios de laboratório para a validação do conhecimento apresentado e desenvolvido neste trabalho. / This work presents an overview of various anti-islanding schemes contained in electronic converters applied to distributed generation systems using solar photovoltaic technology. A detailed study is conducted of various active and passive schemes in the literature. A choice is made of the passive method of frequency and voltage detection and phase jump detection to be used in the developed work. Its implementation is also done in a 1kW single-phase converter with full-bridge structure to operate in current njection e conventional power grid. A study by using numeric simulation in PSIM software and finally, a prototype has been performed and consequently it#s laboratory tests to validate the knowledge presented and developed in this work.

No description available.

Doctorat en philosophie et lettres / info:eu-repo/semantics/nonPublished

Fra Angelico's fresco cycle of the lives and martyrdoms of SS. Stephen and Lawrence in the Chapel of Nicholas V (1447-49) communicate in a style which seems to be rhetorical in the sense that they employ numerous strategies which appear to aim at persuading viewers of the truth of the ideological notions the frescoes convey. This fact encourages one to consider the specific pressures which the context of the frescoes' production may have exerted. Commissioned by a pope who had the training of a professional humanist - and who, as a humanist, had interest in the efficacy of rhetoric - these frescoes convey their messages with a persuasive pictorial 'eloquence1 which, in some respects, corresponds to or plays off on humanist definitions of eloquence. The following study attempts to explain what messages these frescoes were meant to communicate, and how their manner of communication is rhetorical. The rhetorical style becomes a method of conveying old ideas in new ways, and may have made the messages more resonant in the context in which they were meant to function. A paucity of primary documentation on the frescoes makes this type of evaluation difficult. Problems in identifying the frescoes' intended audience and working on the troublesome ground between the rhetorical nature of written and pictorial texts also complicates this' investigation. Nevertheless, by considering the problems and aims of Nicholas Vs pontificate, and by closely examining the subject matter, organization, and expression of the frescoes, some indication as to their probable function may be gained. / Arts, Faculty of / Art History, Visual Art and Theory, Department of / Graduate