SILVA, W. A. Controle de máquina de relutância variável em situações de falta de fase. 2017. 122 f. Tese (Doutorado em Engenharia Elétrica)-Centro de Tecnologia, Universidade Federal do Ceará, Fortaleza, 2017. / Submitted by Hohana Sanders (hohanasanders@hotmail.com) on 2017-10-13T11:58:15Z No. of bitstreams: 1 2017_tese_wasilva.pdf: 2998155 bytes, checksum: 869c3ce8bf5fc6ca4513e3c5c58e1e39 (MD5) / Approved for entry into archive by Marlene Sousa (mmarlene@ufc.br) on 2017-11-03T16:59:37Z (GMT) No. of bitstreams: 1 2017_tese_wasilva.pdf: 2998155 bytes, checksum: 869c3ce8bf5fc6ca4513e3c5c58e1e39 (MD5) / Made available in DSpace on 2017-11-03T16:59:37Z (GMT). No. of bitstreams: 1 2017_tese_wasilva.pdf: 2998155 bytes, checksum: 869c3ce8bf5fc6ca4513e3c5c58e1e39 (MD5) Previous issue date: 2017-07-03 / Many applications which make use of electric machines require non-interruption operation, even in the presence of faults. Within this context, phase faults are obviously undesired, as may lead the machine to stop operating, or, at least, it reduces the performance of thesystem. Under fault scenarios the performance of the system is expected to degrade and control techniques may be helpful to overcome this issue. Switched Reluctance Machines (SRM), due its inherit characteristics, are naturally tolerant to phase faults, despite of the loss of performance. Most of the techniques used to improve the performance of SRMs in fault situations are related to the switching feed converter or in the machine design itself. Regarding this issue, instead of presenting an alternative converter topology, this work alternatively proposes a control approach which significantly reduces the phase faults effects on the speed of the motor. Furthermore, the high frequency noise is attenuated en compared to the classical proportional integral (PI) controller, commonly applied to control such sort of motors. The proposed switched reluctance adaptive feedforward controller (SRM-AFC) is based in compensation functions identified by means of several tests when the system was submitted to one and two faults. The proposed methodology is able to recover the speed of operation faster than a classical approach, when a feedforward action is not taken into account. / Muitas aplicações que fazem uso de máquinas elétricas exigem operações que não sofram a influência sobre sua operação, mesmo na presença de algum tipo de falta no seu sistema de acionamento. Essa é, logicamente, uma situação indesejada e pode inclusive parar a operação do sistema ou, pelo menos, provocar uma redução do desempenho, e, neste sentido, técnicas de controle podem ser úteis em contornar esse problema. Os motores de relutância variável (MRVs), devido suas características inerentes, são naturalmente tolerantes a faltas, apesar da redução do seu desempenho. Observa-se que a maioria das técnicas usadas para melhorar o desempenho em situações de falta são relacionadas com o conversor de potência, ou mesmo com o próprio projeto da máquina. Neste sentido, ao invés de se propor uma nova topologia de conversor ou máquina, este trabalho propõe uma técnica de controle que reduz significativamente os efeitos da falta de fase na velocidade de operação do MRV. Além disso, o ruído de alta frequência é atenuado qu do comparado com um controlador proporcional integral (PI), que é geralmente utilizado em controle de velocidade de máquinas. Nesta tese propõ-se um controlador adaptativo feedforward para o MRV (CAF-MRV). Este baseia-se em funções de compensação identificadas por meio de uma série de ensaios realizados sobre o sistema quando submetidos a uma e duas faltas. A metodologia proposta é capaz de recuperar a velocidade de operação mais rápido do que a técnica clássica, quando uma ação feedforward não é considerada. Foi proposto ainda uma plataforma de simulação do sistema de acionamento sob estudo no ambiente Matlabr, completamente em linhas de código, dotando o sistema de transparência e flexibilidade. Resultados de simulação com o sistema desenvolvido foram comparados com resultados experimentais de modo a ratificar a precisão da metodologia.

Made available in DSpace on 2015-03-03T15:07:32Z (GMT). No. of bitstreams: 1 LivianeCAM.pdf: 2271497 bytes, checksum: 4d8763a73b7fec60ad7f311e565d45b3 (MD5) Previous issue date: 2008-11-19 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This work presents contributions in the detection and identication of faults in multilevel inverters through the study of the converters behavior under these operation conditions. Basically, the approached fault consists of an open-circuit in any switch of a three-level clamped diode inverter. The converter operation is characterized in the pre and post-fault states. A wave form behavior analysis of the pole voltage, phase current and dc-bus current is also done, which highlights characteristics that allow the detection of failure and, even, under favorable conditions, the identication of the faulty device. A compensation strategy of the approached fault (open-switch) is also investigated with the purpose of maintaining the driving system operational when a failure occurs. The proposed topology uses SCRs in parallel with the internal switches of the inverter, which allows, in some occasions, the full utilization of the dc-bus / Este trabalho apresenta contribui??es para a detec??o e identica??o de faltas em inversores multin?veis, baseado no estudo do comportamento desse conversor sob essas condi??es de opera??o. Basicamente, a falta abordada consiste na abertura n?o comandada de uma das chaves de um inversor de tens?o de tr?s n?veis com diodos de grampeamento. O funcionamento do conversor ? caracterizado nos estados de pr? e p?s-falta. ?, tamb?m, feita uma an?lise dos comportamentos das formas de onda das tens?es de p?lo, corrente de fase e correntes do barramento CC, as quais apontam caracter?sticas que possibilitam detectar falta e, ainda, em condi??es favor?veis, identificar o dispositivo que apresentou defeito. Uma estrat?gia de compensa??o da falta abordada (chave aberta) tamb?m ? investigada, com o prop?sito de manter a continuidade de funcionamento do sistema de acionamento, quando da ocorr?ncia de uma falha. A topologia proposta utiliza SCRs em paralelo com as chaves internas do inversor, a qual permite, em algumas ocasi?es, a total utiliza??o do barramento CC

Phénomène à haute prévalence dans le monde entier, les infections acquises au cours de la prestation de soins de santé constituent une menace importante pour la santé publique. Il s’agit d’une réalité inéluctable du système de santé qui touche de nombreuses victimes en les affectant de dommages variés. Fruit d’une interaction complexe entre divers facteurs, ces infections représentent un lourd fardeau pour les victimes comme pour la société, tant au plan physique, mental et financier. Bien que les infections nosocomiales semblent être au cœur des préoccupations des autorités sanitaires québécoises, l’indemnisation des victimes demeure problématique. Actuellement, l’indemnisation se fait via le régime traditionnel de responsabilité civile mais nombreux sont les obstacles auxquels font face les patients désirant obtenir compensation. Les règles classiques s’avèrent difficiles d’application dans un contexte où la source de l’infection est souvent inconnue et les facteurs ayant pu contribuer à son développement sont multiples. Face à cette problématique et à l’insatisfaction ressentie, certaines juridictions étrangères ont reconnu le caractère inadapté du régime traditionnel et ont implanté un régime d’indemnisation sans égard à la faute dans l’espoir d’améliorer le sort des victimes. Le Québec a opté pour la même solution dans divers domaines, tels que les accidents automobiles et la vaccination. Ce mémoire propose une étude approfondie de l’opportunité d’adopter, en droit québécois, un régime d’indemnisation sans égard à la faute bénéficiant aux victimes d’infections nosocomiales. L’objectif de ce projet est de faire une esquisse des caractéristiques assurant l’efficacité et la viabilité d’un tel régime. / Highly prevailing phenomenon worldwide, healthcare associated infections pose a significant threat to public health. They are considered to be an inevitable reality of the healthcare system that affects a large number of persons with diverse injuries. They result from a complex interplay of factors and represent a major burden for both victims and society, physically, mentally and financially. Although healthcare associated infections seem to be an important concern for health authorities in Quebec, compensation of victims remains problematic. At the moment, victims have to go through the traditional system of civil liability and face numerous obstacles. Classic rules are proved to be difficult to apply in a context where the source of the infection is often unknown and the factors that contributed to its development multiple. Confronted to this problem and to the dissatisfaction felt, some foreign jurisdictions have recognized the unsuitability of traditional rules and have introduced a no-fault compensation system in the hope of improving victims’ fate. Quebec chose to opt for the same solution in various fields, such as automobile accidents and immunization. This thesis proposes a comprehensive study of the need to adopt a no-fault compensation scheme benefiting victims of healthcare associated infections. The objective of this project is to outline the characteristics that would ensure the efficiency and viability of the no-fault scheme.

Phénomène à haute prévalence dans le monde entier, les infections acquises au cours de la prestation de soins de santé constituent une menace importante pour la santé publique. Il s’agit d’une réalité inéluctable du système de santé qui touche de nombreuses victimes en les affectant de dommages variés. Fruit d’une interaction complexe entre divers facteurs, ces infections représentent un lourd fardeau pour les victimes comme pour la société, tant au plan physique, mental et financier. Bien que les infections nosocomiales semblent être au cœur des préoccupations des autorités sanitaires québécoises, l’indemnisation des victimes demeure problématique. Actuellement, l’indemnisation se fait via le régime traditionnel de responsabilité civile mais nombreux sont les obstacles auxquels font face les patients désirant obtenir compensation. Les règles classiques s’avèrent difficiles d’application dans un contexte où la source de l’infection est souvent inconnue et les facteurs ayant pu contribuer à son développement sont multiples. Face à cette problématique et à l’insatisfaction ressentie, certaines juridictions étrangères ont reconnu le caractère inadapté du régime traditionnel et ont implanté un régime d’indemnisation sans égard à la faute dans l’espoir d’améliorer le sort des victimes. Le Québec a opté pour la même solution dans divers domaines, tels que les accidents automobiles et la vaccination. Ce mémoire propose une étude approfondie de l’opportunité d’adopter, en droit québécois, un régime d’indemnisation sans égard à la faute bénéficiant aux victimes d’infections nosocomiales. L’objectif de ce projet est de faire une esquisse des caractéristiques assurant l’efficacité et la viabilité d’un tel régime. / Highly prevailing phenomenon worldwide, healthcare associated infections pose a significant threat to public health. They are considered to be an inevitable reality of the healthcare system that affects a large number of persons with diverse injuries. They result from a complex interplay of factors and represent a major burden for both victims and society, physically, mentally and financially. Although healthcare associated infections seem to be an important concern for health authorities in Quebec, compensation of victims remains problematic. At the moment, victims have to go through the traditional system of civil liability and face numerous obstacles. Classic rules are proved to be difficult to apply in a context where the source of the infection is often unknown and the factors that contributed to its development multiple. Confronted to this problem and to the dissatisfaction felt, some foreign jurisdictions have recognized the unsuitability of traditional rules and have introduced a no-fault compensation system in the hope of improving victims’ fate. Quebec chose to opt for the same solution in various fields, such as automobile accidents and immunization. This thesis proposes a comprehensive study of the need to adopt a no-fault compensation scheme benefiting victims of healthcare associated infections. The objective of this project is to outline the characteristics that would ensure the efficiency and viability of the no-fault scheme.