Integração M2M de sistemas embebidos em gestão de activos industriais

Tese de doutoramento em Física (Pré-Bolonha), Especialidade de Física Tecnológica, apresentada à Faculdade de Ciências e Tecnologia da Universidade de CoimbraEsta dissertação apresenta um estudo de um modelo para o exercício da gestão de activos industriais, baseado na integração de sistemas embebidos de medida e controlo com módulos de comunicação sem fios de baixo consumo, num quadro de comunicações Máquina-a-Máquina (M2M), e subsequentes realizações para aplicações industriais diversas . São aqui apresentados e discutidos os aspectos que caracterizam sistemas de informação locais e remotos, para aplicações industriais de manutenção preditiva de activos, segurança de pessoas e activos, e optimização da produção. São apresentados sistemas realizados para cenários e aplicações industriais com características bem distintas: subestações da rede eléctrica, perímetros de processo químico, e minas subterrâneas. É aqui demonstrado que os sistemas embebidos têm capacidade para conduzir aplicações simples de disgnóstico e reduzir o volume de dados desde a origem, sem perder a qualidade da informação, constituindo-se assim como agentes de suporte à decisão, em tempo útil. O trabalho conclui também que uma autonomia energética necessária à viabilidade dos sistemas é conseguida com a simplificação da sua programação, com o exacto dimensionamento da sua memória interna, e com a correcta selecção da frequência de operação

Multi-agent and knowledge-based system for power transformer fault diagnosis

Transformer reliability and stability are the key concerns. In order to increase their efficiency, an automatic monitoring and fault diagnosing of the power transformers are required. Dissolved Gas Analysis (DGA) is one of the most important tools to diagnose the condition of oil-immersed transformer. Agents technology as a new, robust and helpful technique, successfully applied for various applications. Integration of the Multi-Agent System (MAS) with knowledge base provides a robust system for various applications, such as fault diagnosis and automated actions performing, etc. For this purpose, the present study was conducted in the field of MAS based on Gaia methodology and knowledge base. The developed MAS followed by Gaia methodology represents a generic framework that is capable to manage agents executions and message delivery. Real-time data is sampled from a power transformer and saved into a database, and it is also available to the user on request. Three types of knowledge-based systems, namely the rule-based reasoning, ontology and fuzzy ontology, were applied for the MAS. Therefore, the developed MAS is shown to be successfully applied for condition monitoring of power transformer using the real-time data. The Roger’s method was used with all of the knowledge-based systems named above, and the accuracy of the results was compared and discussed. Of the knowledge-based systems studied, fuzzy ontology is found to be the best performing one in terms of results accuracy, compared to the rule-based reasoning and ontology. The application of the developed fuzzy ontology allowed to improve the accuracy by over 22%. Unlike the previous works in this field, that were not capable of dealing with the uncertainty situations, the present work based on fuzzy ontology has a clear advantage of successfully solving the problem with some degree of uncertainty. This is especially important, as the most of the real-world situations involve some uncertainty. Overall, the work contributes the use of the knowledge base and the multi-agent system for the fault diagnosis of the power transformer, including the novel application of fuzzy ontology for dealing with the uncertain situations. The advantages of the proposed method are the ease of the upgrade, flexibility, efficient fault diagnosis and reliability. The application of the proposed technique would benefit the power system reliability, as it would result in reduction of the number of engineering experts required, lower maintenance expenses and extended lifetime of power transformer

5º Congreso Europeo sobre Eficiencia Energética y Sostenibilidad en Arquitectura y Urbanismo : Donostia-San Sebastián, 7-9 Julio 2014

XXXIII Cursos de Verano de la UPV/EHUEste libro recoge las comunicaciones seleccionadas para el 5º Congreso Europeo sobre Eficiencia Energética y Sostenibilidad en Arquitectura, organizado por el grupo de investigación Calidad de Vida en Arquitectura de la Universidad del País Vasco/Euskal Herriko Unibertsitatea