Made available in DSpace on 2014-12-17T15:47:49Z (GMT). No. of bitstreams: 1 DiogoFO.pdf: 866073 bytes, checksum: bf59c2597aef9b7382b7e14bd4914265 (MD5) Previous issue date: 2008-09-01 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / Multi-classifier systems, also known as ensembles, have been widely used to solve several problems, because they, often, present better performance than the individual classifiers that form these systems. But, in order to do so, it s necessary that the base classifiers to be as accurate as diverse among themselves this is also known as diversity/accuracy dilemma. Given its importance, some works have investigate the ensembles behavior in context of this dilemma. However, the majority of them address homogenous ensemble, i.e., ensembles composed only of the same type of classifiers. Thus, motivated by this limitation, this thesis, using genetic algorithms, performs a detailed study on the dilemma diversity/accuracy for heterogeneous ensembles / Sistemas Multiclassificadores, tamb?m conhecidos como comit?s de classificadores, t?m sido amplamente utilizados para resolver os mais variados problemas, pois em geral t?m melhores desempenhos que os classificadores base que formam esses sistemas. Para que isso ocorra, por?m, ? necess?rio que os classificadores base sejam t?o acurados quanto diversos entre si isso ? conhecido como dilema da diversidade-acur?cia. Dado a sua import?ncia, alguns trabalhos sobre o estudo do omportamento dos comit?s no contexto desse dilema foram propostos. Entretanto, a maioria dos trabalhos estudou tal problema para comit?s homog?neos, ou seja, comit?s formados apenas por classificadores do mesmo tipo. Sendo assim, motivado por esta limita??o, esta disserta??o, usando algoritmos gen?ticos, efetua um estudo mais detalhado sobre o dilema da diversidade-acur?cia em comit?s heterog?neos

Made available in DSpace on 2015-03-03T15:22:33Z (GMT). No. of bitstreams: 1 JoseCRN_DISSERT.pdf: 908143 bytes, checksum: e49901002fbfc242e514099db9428039 (MD5) Previous issue date: 2010-04-16 / Os Algoritmos Gen?tico (AG) e o Simulated Annealing (SA) s?o algoritmos constru?dos para encontrar m?ximo ou m?nimo de uma fun??o que representa alguma caracter?stica do processo que est? sendo modelado. Esses algoritmos possuem mecanismos que os fazem escapar de ?timos locais, entretanto, a evolu??o desses algoritmos no tempo se d? de forma completamente diferente. O SA no seu processo de busca trabalha com apenas um ponto, gerando a partir deste sempre um nova solu??o que ? testada e que pode ser aceita ou n?o, j? o AG trabalha com um conjunto de pontos, chamado popula??o, da qual gera outra popula??o que sempre ? aceita. Em comum com esses dois algoritmos temos que a forma como o pr?ximo ponto ou a pr?xima popula??o ? gerada obedece propriedades estoc?sticas. Nesse trabalho mostramos que a teoria matem?tica que descreve a evolu??o destes algoritmos ? a teoria das cadeias de Markov. O AG ? descrito por uma cadeia de Markov homog?nea enquanto que o SA ? descrito por uma cadeia de Markov n?o-homog?nea, por fim ser?o feitos alguns exemplos computacionais comparando o desempenho desses dois algoritmos

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-05-30T23:14:12Z No. of bitstreams: 1 RomuloAlvesDeOliveira_TESE.pdf: 1869244 bytes, checksum: af0453c8083aee85607b79c3a17c1d4c (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-01T22:30:48Z (GMT) No. of bitstreams: 1 RomuloAlvesDeOliveira_TESE.pdf: 1869244 bytes, checksum: af0453c8083aee85607b79c3a17c1d4c (MD5) / Made available in DSpace on 2016-06-01T22:30:48Z (GMT). No. of bitstreams: 1 RomuloAlvesDeOliveira_TESE.pdf: 1869244 bytes, checksum: af0453c8083aee85607b79c3a17c1d4c (MD5) Previous issue date: 2015-01-27 / Atualmente os projetos de Ilumina??o P?blica (IP), ou seja, ruas, avenidas, pra?as, estacionamentos e similares s?o realizados com a utiliza??o de softwares comerciais ou livres, em geral, fornecidos por fabricantes ou grupos de fabricantes de produtos de ilumina??o, aplicando o M?todo Ponto a Ponto para o c?lculo dos n?veis de ilumina??o. Outros pontos em comum s?o: a falta de preocupa??o na redu??o dos custos dos projetos e a dificuldade em modificar as estruturas utilizadas, tais como: localiza??o e altura dos postes e lumin?rias, ?ngulo de inclina??o das lumin?rias, quantidade de lumin?rias por poste, entre outros. Qualquer altera??o nas estruturas ter? que ser feita manualmente, geralmente em um ambiente CAD, para depois obter os novos resultados e comparar com os anteriores. Para auxiliar nessa tarefa, ? proposta aqui a utiliza??o da Metaheur?stica Col?nia de Formigas, onde os par?metros e localiza??o das estruturas passam a ser definidos automaticamente, de forma a atender os n?veis de ilumina??o estabelecidos nas normas t?cnicas, al?m de otimizar o custo de material por unidade de ?rea. / The development of public lighting projects in Brazil must meet the standards established in Brazilian standards. Many of these projects is developed through the use of knowledge about "practical rules" practiced by the designers of this area. In some cases are also used computational tools offered, generally, by leading manufacturers of lamps/luminaires. These tools have served only as calculation tools, with some limitations, such as: are not able to verify compliance or not the parameters established by Brazilian standards, most of the luminaires offered in your database are not sold in Brazil, not have no concern about the analysis of the implementation costs of elaborate designs and, finally, present an enormous difficulty in performing tests on a large volume of possible projects. It is the goal of this thesis to develop a methodology and a computational tool for the development of public lighting projects based on genetic algorithm techniques that not only perform the calculations of these projects, but can also test several possible projects using in your database the luminaires marketed in Brazil, providing the user, as a solution, a set of projects that meet the Brazilian standards and classified according the implementation costs of each project. To adjust the proposed algorithm the following performance parameters were modified: number of individuals in the initial population; probability of achievement of the cross-over; probability of achievement of the mutation. A comparison of this method with the projects developed with the use of "practical rules" is performed for various types of existing roads. The results obtained using the proposed methodology and the developed computational tool show that the methodology, including the adjustments in performance parameters, is able to meet the objectives of the work.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-09T22:51:26Z No. of bitstreams: 1 GilmaraLinharesDeAraujo_TESE.pdf: 11647948 bytes, checksum: 94a5e966f18f8dd6bfc6646d2519542b (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-10T23:44:37Z (GMT) No. of bitstreams: 1 GilmaraLinharesDeAraujo_TESE.pdf: 11647948 bytes, checksum: 94a5e966f18f8dd6bfc6646d2519542b (MD5) / Made available in DSpace on 2016-08-10T23:44:37Z (GMT). No. of bitstreams: 1 GilmaraLinharesDeAraujo_TESE.pdf: 11647948 bytes, checksum: 94a5e966f18f8dd6bfc6646d2519542b (MD5) Previous issue date: 2015-12-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Esse trabalho apresenta uma t?cnica h?brida de projeto de superf?cies seletivas em frequ?ncia, sobre uma camada diel?trica isotr?pica, considerando diversas geometrias para os elementos das c?lulas unit?rias. Especificamente, a t?cnica h?brida usa o m?todo do circuito equivalente em conjunto com algoritmos gen?ticos, visando a s?ntese de estruturas com resposta singleband e dual-band. O m?todo do circuito equivalente permite modelar a estrutura por meio de um circuito equivalente e tamb?m a obten??o de circuitos para diferentes geometrias. A partir da obten??o dos par?metros desses circuitos, podem-se obter as caracter?sticas de transmiss?o e de reflex?o das estruturas modeladas. Para obter a otimiza??o das estruturas modeladas, de acordo com a resposta em frequ?ncia desejada, a ferramenta de otimiza??o do Matlab optimtool mostrou-se de f?cil utiliza??o, permitindo explorar resultados importantes na an?lise de otimiza??o. No trabalho, s?o apresentados resultados num?ricos e experimentais para as caracter?sticas de transmiss?o de diferentes geometrias analisadas. Foram efetuadas compara??es com resultados apresentados na literatura, tendo-se observado uma boaconcord?ncia nos casos analisados para estruturas com substratos isotr?picos. / This thesis presents a hybrid technique of frequency selective surfaces project (FSS) on a isotropic dielectric layer, considering various geometries for the elements of the unit cell. Specifically, the hybrid technique uses the equivalent circuit method in conjunction with genetic algorithm, aiming at the synthesis of structures with response single-band and dual-band. The equivalent circuit method allows you to model the structure by using an equivalent circuit and also obtaining circuits for different geometries. From the obtaining of the parameters of these circuits, you can get the transmission and reflection characteristics of patterned structures. For the optimization of patterned structures, according to the desired frequency response, Matlab? optimization tool named optimtool proved to be easy to use, allowing you to explore important results on the optimization analysis. In this thesis, numeric and experimental results are presented for the different characteristics of the analyzed geometries. For this, it was determined a technique to obtain the parameter N, which is based on genetic algorithms and differential geometry, to obtain the algebraic rational models that determine values of N more accurate, facilitating new projects of FSS with these geometries. The optimal results of N are grouped according to the occupancy factor of the cell and the thickness of the dielectric, for modeling of the structures by means of rational algebraic equations. Furthermore, for the proposed hybrid model was developed a fitness function for the purpose of calculating the error occurred in the definitions of FSS bandwidths with transmission features single band and dual band. This thesis deals with the construction of prototypes of FSS with frequency settings and band widths obtained with the use of this function. The FSS were initially reviewed through simulations performed with the commercial software Ansoft Designer ?, followed by simulation with the equivalent circuit method for obtaining a value of N in order to converge the resonance frequency and the bandwidth of the FSS analyzed, then the results obtained were compared. The methodology applied is validated with the construction and measurement of prototypes with different geometries of the cells of the arrays of FSS.

Made available in DSpace on 2014-12-17T14:55:04Z (GMT). No. of bitstreams: 1 MarceloRBGV.pdf: 514846 bytes, checksum: f54178f2d4a2cb1b74a993d664aad1b3 (MD5) Previous issue date: 2007-12-05 / On this paper, it is made a comparative analysis among a controller fuzzy coupled to a PID neural adjusted by an AGwith several traditional control techniques, all of them applied in a system of tanks (I model of 2nd order non lineal). With the objective of making possible the techniques involved in the comparative analysis and to validate the control to be compared, simulations were accomplished of some control techniques (conventional PID adjusted by GA, Neural PID (PIDN) adjusted by GA, Fuzzy PI, two Fuzzy attached to a PID Neural adjusted by GA and Fuzzy MISO (3 inputs) attached to a PIDN adjusted by GA) to have some comparative effects with the considered controller. After doing, all the tests, some control structures were elected from all the tested techniques on the simulating stage (conventional PID adjusted by GA, Fuzzy PI, two Fuzzy attached to a PIDN adjusted by GA and Fuzzy MISO (3 inputs) attached to a PIDN adjusted by GA), to be implemented at the real system of tanks. These two kinds of operation, both the simulated and the real, were very important to achieve a solid basement in order to establish the comparisons and the possible validations show by the results / Neste trabalho ?realizado uma an?lise comparativa entre um controlador fuzzy acoplado aum PID neural ajustado por um AGcom diversas t?cnicas de controle tradicionais, todas elas aplicadas em um sistema de tanques (modelo de 2a ordem n?o linear). Com o objetivo de viabilizar as t?cnicas envolvidas nas an?lises comparativas e validar o controle a ser comparado, foram realizadas simula??es de algumas t?cnicas de controle (PID convencional ajustado por AG, PID Neural (PIDN) ajustado por AG, Fuzzy PI, Fuzzy cascata acoplado a um PIDN ajustado por AG e Fuzzy MISO (3 entradas) acoplado a um PIDN ajustado por AG) para efeitos comparativos com o controlador proposto. Depois de realizar todos os testes simulados, foram eleitas, dentre as t?cnicas testadas na fase de simula??o, algumas estruturas de controle (PID convencional ajustado por AG, Fuzzy PI, Fuzzy cascata acoplado aum PIDN ajustado por AGeFuzzy MISO (3entradas) acoplado a um PIDN ajustado por AG) para serem implementadas no sistema real de tanques. Esses dois modos de opera??o, tanto o simulado como o real, se fizeram importantes para um embasamento s?lido para fazer as compara??es e valida??es poss?veis mostradas nos resultados

Made available in DSpace on 2014-12-17T14:55:43Z (GMT). No. of bitstreams: 1 GustavoAC__DISSERT.pdf: 2594771 bytes, checksum: b46a4c0b026ad559d9ed126acb92b471 (MD5) Previous issue date: 2010-07-09 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The telecommunications industry has experienced recent changes, due to increasing quest for access to digital services for data, video and multimedia, especially using the mobile phone networks. Recently in Brazil, mobile operators are upgrading their networks to third generations systems (3G) providing to users broadband services such as video conferencing, Internet, digital TV and more. These new networks that provides mobility and high data rates has allowed the development of new market concepts. Currently the market is focused on the expansion of WiMAX technology, which is gaining increasingly the market for mobile voice and data. In Brazil, the commercial interest for this technology appears to the first award of licenses in the 3.5 GHz band. In February 2003 ANATEL held the 003/2002/SPV-ANATEL bidding, where it offered blocks of frequencies in the range of 3.5 GHz. The enterprises who purchased blocks of frequency were: Embratel, Brazil Telecom (Vant), Grupo Sinos, Neovia and WKVE, each one with operations spread in some regions of Brazil. For this and other wireless communications systems are implemented effectively, many efforts have been invested in attempts to developing simulation methods for coverage prediction that is close to reality as much as possible so that they may become believers and indispensable tools to design wireless communications systems. In this work wasm developed a genetic algorithm (GA's) that is able to optimize the models for predicting propagation loss at applicable frequency range of 3.5 GHz, thus enabling an estimate of the signal closer to reality to avoid significant errors in planning and implementation a system of wireless communication / O setor de telecomunica??es vem passando por grandes transforma??es, devido ao aumento da busca por acesso a servi?os digitais de transmiss?o de dados, v?deo e multim?dia, especialmente, por meios das redes de telefonia m?vel. Recentemente, no Brasil, as operadoras de telefonia m?vel v?m atualizando suas redes para sistemas de terceira gera??o (3G) proporcionando aos usu?rios servi?os em banda larga como v?deo confer?ncia, Internet e TV digital, dentre outros. Essas novas redes que proporcionam mobilidade e elevadas taxas de transmiss?o t?m permitido o desenvolvimento de novos conceitos de mercado de servi?os. Atualmente o mercado est? voltado para a expans?o da tecnologia WiMAX, que v?m ganhando cada vez mais o mercado das comunica??es m?veis de voz e de dados. No Brasil o interesse comercial para esta tecnologia aparece com a primeira outorga de licen?as em 3,5 GHz. Em fevereiro de 2003, a ANATEL realizou a licita??o 003/2002/SPV-ANATEL, onde ofereceu blocos de frequ?ncia em 3,5 GHz. As operadoras que adquiriram os blocos de frequ?ncia foram: Embratel, Brasil Telecom (Vant), Grupo Sinos, Neovia e WKVE, cada uma com opera??es distribu?das em regi?es do Brasil. Para que esse e outros sistemas de comunica??es sem fio sejam implementados com efici?ncia, muitos esfor?os t?m sido investidos na tentativa de desenvolvimento de m?todos de simula??o, de predi??o e de cobertura que se aproximem da realidade o melhor poss?vel, de forma a que se possam tornar ferramentas fi?is e indispens?veis no planejamento dos sistemas de comunica??es sem fio. Neste trabalho, foi desenvolvido um algoritmo gen?tico (AG s) capaz de otimizar os modelos de predi??o de perda de propaga??o aplic?veis na frequ?ncia de 3,5 GHz, possibilitando dessa forma uma estimativa do sinal mais pr?xima da realidade, evitando erros significativos no planejamento e implementa??o de um sistema de comunica??o sem fio

Made available in DSpace on 2014-12-17T14:56:11Z (GMT). No. of bitstreams: 1 EwinLFB_DISSERT.pdf: 1133428 bytes, checksum: 7db5058d9183e9d7e1e87f596676c111 (MD5) Previous issue date: 2012-07-20 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The main objective of this work is to optimize the performance of frequency selective surfaces (FSS) composed of crossed dipole conducting patches. The optimization process is performed by determining proper values for the width of the crossed dipoles and for the FSS array periodicity, while the length of the crossed dipoles is kept constant. Particularly, the objective is to determine values that provide wide bandwidth using a search algorithm with representation in bioinspired real numbers. Typically FSS structures composed of patch elements are used for band rejection filtering applications. The FSS structures primarily act like filters depending on the type of element chosen. The region of the electromagnetic spectrum chosen for this study is the one that goes from 7 GHz to 12 GHz, which includes mostly the X-band. This frequency band was chosen to allow the use of two X-band horn antennas, in the FSS measurement setup. The design of the FSS using the developed genetic algorithm allowed increasing the structure bandwidth / Este trabalho tem como objetivo principal efetuar a otimiza??o do desempenho de estruturas de superf?cies seletivas de frequ?ncia FSS (Frequency Selective Surface), com patches condutores na forma de dipolos em cruz. A otimiza??o foi realizada atrav?s da identifica??o de valores ?timos para a largura do dipolo e a periodicidade do arranjo, considerando o valor do comprimento do dipolo fixo. Especificamente, objetiva-se determinar valores que permitam aumentar a largura de banda, utilizando um algoritmo de busca bioinspirado com representa??o em n?meros reais. As aplica??es t?picas de estruturas de FSS com patches condutores utilizam frequ?ncias selecionadas atrav?s das faixas de rejei??o. As estruturas de FSS funcionam basicamente como filtros dependendo do tipo de elemento escolhido. A regi?o do espectro eletromagn?tico escolhida para este estudo foi a faixa de 7 GHz a 12 GHz, que inclui basicamente a banda X. Essa regi?o do espectro eletromagn?tico foi escolhida para possibilitar a medi??o do dispositivo com a utiliza??o de antenas de abertura do tipo corneta, que operam na banda X. O projeto da FSS com a utiliza??o do algoritmo gen?tico GA (Genetic Algorithm) permitiu aumentar a largura de banda da estrutura

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2018-03-12T13:20:55Z No. of bitstreams: 1 AndreHenriqueMatiasPires_DISSERT.pdf: 5565361 bytes, checksum: f5665a81cdc1abafd016753cfb9016e6 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2018-03-13T20:49:03Z (GMT) No. of bitstreams: 1 AndreHenriqueMatiasPires_DISSERT.pdf: 5565361 bytes, checksum: f5665a81cdc1abafd016753cfb9016e6 (MD5) / Made available in DSpace on 2018-03-13T20:49:03Z (GMT). No. of bitstreams: 1 AndreHenriqueMatiasPires_DISSERT.pdf: 5565361 bytes, checksum: f5665a81cdc1abafd016753cfb9016e6 (MD5) Previous issue date: 2017-12-06 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O controle de sistemas din?micos apresenta-se como um desafio. Os m?todos tradicionalmente utilizados na sintonia apresentam a dificuldade em expressar as especifica??es pretendidas e conseguir encontrar controladores que atendam a esses requerimentos, sobretudo quando o caso exige controladores mais complexos, como no caso de problemas MIMO (Multiple Input Multiple Output). Devido ? crescente competitividade na ind?stria, torna-se imprescind?vel utilizar t?cnicas de sintonia mais eficientes e que de fato consigam encontrar controladores com desempenho pretendido. Pode-se, para isso, utilizar meta-heur?sticas, como Particle Swarm Optimization (PSO), Algoritmo Gen?tico (AG) e Algoritmo do Vagalume(AV) para a obten??o dos par?metros do controlador de acordo com uma fun??o de avalia??o, a qual deve conseguir, de fato, codificar o qu?o bom ? um dado controlador, expressando de forma adequada as especifica??es desejadas, de modo que a meta-heur?stica empregada consiga encontrar o controlador que melhor satisfa?a tal fun??o. Em vista disso, prop?e-se a utiliza??o da an?lise wavelet multin?veis, j? muito presente na literatura, voltada para outras aplica??es, sobretudo na an?lise de sinais, sons e imagens, para a confec??o de um ?ndice a ser utilizado como fun??o de avalia??o na otimiza??o de controladores. A an?lise wavelet permite a apreens?o de informa??es do comportamento e forma do sinal, informando frequ?ncia de um sinal ao longo do tempo, caracter?stica que pode ser desej?vel, na avalia??o e projeto de controladores sendo, assim, poss?vel avaliar separadamente o desempenho do transit?rio e do regime permanente. Foi feito um estudo de caso, encontrando o controle otimizado de um sistema MIMO de quatro tanques acoplados. Foi feito um estudo comparativo com outras fun??es de avalia??o apresentadas na literatura e com o m?todo do LGR (Lugar Geom?trico das Raizes). Os controladores implementados apresentaram o desempenho esperado, e aquele encontrado utilizando o ?ndice proposto presentou melhor desempenho. / The control of dynamic systems is a challenge, the methods traditionally used in tuning present the difficulty in expressing the desired specifications and being able to find controllers that produce these requirements, especially when the case requires more complex controllers, as in the case of Multiple Input Multiple Output (MIMO) problems. Due to the increasing competitiveness in the industry, it becomes imperative to use more efficient tuning techniques and that in fact can find controllers with the desired performance. For this, one can use metaheuristics, such as Particle Swarm Optimization (PSO), Genetic Algorithm (AG) and Vagalume Algorithm (AV) to obtain the parameters of the controller according to a fitness function, which should in fact code how good a given controller is, adequately expressing the desired specifications, so that the metaheuristic employed can find the optimal controller, which best satisfies the chosen fitness function. Therefore, it is proposed to use the multilevel wavelet analysis, already present in the literature, focused on other applications, especially in the analysis of signals, sounds and images, for the creation of an index to be used as a fitness function in control optimization. Wavelet analysis allows to capture information on the behavior and shape of the signal by informing the frequency of a signal over time, a characteristic that may be desirable, in the evaluation and design of controllers and, thus, it is possible to separately evaluate the transient and steady-state performances. A case study will be done, finding control of a MIMO system of four coupled tanks. A comparative study was made with other fitness functions presented in the literature and with the LGR (Geometric Place of Roots) method. The implemented controllers presented the expected performance, and the one found using the proposed index presented better performance.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-03-21T00:42:43Z No. of bitstreams: 1 DiegoDeyvidDantasDeMedeiros_DISSERT.pdf: 4782158 bytes, checksum: be79da038af407e962d4d79b658f60aa (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-27T21:02:24Z (GMT) No. of bitstreams: 1 DiegoDeyvidDantasDeMedeiros_DISSERT.pdf: 4782158 bytes, checksum: be79da038af407e962d4d79b658f60aa (MD5) / Made available in DSpace on 2017-03-27T21:02:24Z (GMT). No. of bitstreams: 1 DiegoDeyvidDantasDeMedeiros_DISSERT.pdf: 4782158 bytes, checksum: be79da038af407e962d4d79b658f60aa (MD5) Previous issue date: 2017-01-05 / Atualmente, com o crescente incentivo ? utiliza??o de fontes alternativas e renov?veis de energia, aumentou-se a quantidade de geradores conectados ?s redes de distribui??o de energia el?trica. Dentre os quais est?o, por exemplo, os parques e?licos, sistemas de energia solar fotovoltaica e sistemas de cogera??o formando a chamada Gera??o Distribu?da. Diante deste panorama mundial, torna-se iminente a necessidade de desenvolvimento de novas tecnologias e programas computacionais que possibilitem a otimiza??o das conex?es de geradores no sistema el?trico. Isto deve ser realizado de forma que, dentre outras vantagens, as estrat?gias de controle sejam aperfei?oadas e a efici?ncia, aumentada. Este trabalho apresenta a cria??o do software Optimal-GeDist, desenvolvido para auxiliar no planejamento de redes de distribui??o de energia el?trica em m?dia tens?o. Basicamente, esta ferramenta computacional calcula inje??o ?tima de pot?ncia da gera??o distribu?da nas barras da rede, al?m de determinar os melhores pontos de conex?o de cargas de m?dio e grande porte que pretendam se conectar ao sistema, como, por exemplo, ind?strias e postos de carregamento de ve?culos el?tricos. Por se tratar de um problema no qual o espa?o de busca ? amplo e com a possibilidade de m?nimos locais, optou-se em utilizar o Algoritmo Gen?tico como ferramenta de otimiza??o, mais adequado para este tipo de problema. Atrav?s da sua aplica??o, pode-se encontrar o ponto ?timo de opera??o da rede de modo a otimizar as perdas t?cnicas do sistema. Para a simula??o do sistema, optou-se pelo m?todo de fluxo de carga Soma de Pot?ncias, desenvolvido para sistemas radias de m?dia tens?o e apresentando uma converg?ncia r?pida e precisa. / Currently, with the increasing of incentive to use alternative and renewable energy sources, the number of generators connected to the electricity distribution networks has increased. Among them are, for example, wind farms, photovoltaic solar energy systems and cogeneration systems forming the so-called Distributed Generation. In view of this global panorama, it is imminent the need to develop new technologies and computer programs that allow the optimization of the connections of generators in the electrical system. This should be done in such a way that, among other advantages, control strategies are improved and efficiency increased. This work presents the creation of Optimal-GeDist software, developed to assist in the planning of electricity distribution networks in medium voltage. This computational tool calculates optimum power injection of the distributed generation in the network bars, in addition to determining the best connection points of future loads that wish to connect to the system. Because it is a problem, in which search space is large and with the possibility of local minimums, it was decided to use the Genetic Algorithm as an optimization tool, more suitable for this type of problem. Through its application, it is possible to find the optimal point of operation of the network in order to optimize the technical losses of the system. For the simulation of the system, it?s opted for the Power Sum load flow method, developed for medium voltage radial systems and presenting a fast and accurate convergence.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-07-17T13:14:38Z No. of bitstreams: 1 FranciscaDeFatimaDoNascimentoSilva_TESE.pdf: 4413362 bytes, checksum: e0033cfcbd51c0cdcb5f93d10f64d5d3 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-07-19T11:55:55Z (GMT) No. of bitstreams: 1 FranciscaDeFatimaDoNascimentoSilva_TESE.pdf: 4413362 bytes, checksum: e0033cfcbd51c0cdcb5f93d10f64d5d3 (MD5) / Made available in DSpace on 2017-07-19T11:55:56Z (GMT). No. of bitstreams: 1 FranciscaDeFatimaDoNascimentoSilva_TESE.pdf: 4413362 bytes, checksum: e0033cfcbd51c0cdcb5f93d10f64d5d3 (MD5) Previous issue date: 2017-03-06 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O desenvolvimento de um campo petrol?fero pode ser entendido como o conjunto de a??es necess?rias para colocar o campo em produ??o: perfura??es, sistemas de inje??o, plataformas, etc. A forma como ser? feito este desenvolvimento define uma ou mais alternativas. Assim, definir alternativas de desenvolvimento de um campo petrol?fero ? uma das tarefas mais importantes na ?rea de reservat?rios, dado que estas defini??es afetam o comportamento do reservat?rio, decis?es futuras, an?lises econ?micas e, consequentemente, a atratividade resultante dos projetos definidos. Este trabalho apresenta a implementa??o de um sistema otimizador multiobjetivo baseado no algoritmo gen?tico NSGA-II (Non-Dominated Sorting Genetic Algorithm), que oferece uma ferramenta de suporte ? decis?o e automatiza a busca de alternativas para o desenvolvimento de campos petrol?feros submetidos ao processo de inje??o de ?gua. Cada alternativa refere-se ? forma como um campo petrol?fero, conhecido e delimitado, ? colocado em produ??o, isto ?, diz respeito ? determina??o do n?mero e a disposi??o dos po?os produtores e injetores no campo. A aplica??o do algoritmo consiste em encontrar as configura??es de produ??o que, em longo prazo, forne?am o maior Valor Presente L?quido (VPL), obtido a partir do custo de investimento inicial, do pre?o do petr?leo, da produ??o de ?leo e dos custos de opera??o pagos durante o tempo de produ??o, ou seja, a condi??o operacional mais vi?vel economicamente, reduzindo o tempo do processo de tomada de decis?o. Com os resultados apresentados foi poss?vel observar que em v?rios casos as aplica??es das linhas de a??o possibilitaram aumentos significativos no VPL e no Fator de Recupera??o ao final do projeto. Considerando o Caso_36 de dimens?o de malha de 300m, o Fator de Recupera??o aumentou de 45,66% para 50,24%, um aumento de quase 5 pontos percentuais no volume de ?leo recuperado. Diante do exposto, observa-se que as interven??es operacionais de alterar (aumentar ou diminuir) a vaz?o de inje??o de ?gua inicial ou mudar o layout de malha no campo melhoram a rentabilidade, reduzindo os custos com a inje??o de ?gua, tratamento e descarte da ?gua produzida, aumentando o tempo de viabilidade do projeto. Por outro lado, ? importante destacar tamb?m que, em alguns casos, ao aplicar as linhas de a??o, o Fator de recupera??o final ? menor, mas ainda sim as redu??es dos custos operacionais viabilizam a opera??o. / The development of an oil field can be understood as the set of actions necessary to put the field into production: drilling, injection systems, platforms, etc. This development the way will be made defines an alternative. Set a development of an oil field alternative is one of the most important tasks in the reservoir area, given that this definition affects the reservoir behavior, future decisions, economic analysis and consequently the resulting attractiveness of the defined project. This paper presents the implementation of a system based on genetic algorithm multiobjective optimizer NSGA-II (Non-Dominated Sorting Genetic Algorithm), which offers a decision support tool and automates the search for alternatives to the development of the oilfield submitted to water injection process. Each alternative refers to how an oil field, known and defined, is put into production, that is, with respect to the determination of number and the disposition of producers wells and injectors in the field. The implementation of the algorithm is to find the production settings, in the long run, which provide the highest net present value (NPV), obtained from the initial investment cost, the price of oil, oil production and operation costs paid during the production time, considering the operational conditions economically viable, reducing operating costs and the time in the decision-making process. With the obtained results it was possible to observe that in many cases the application of the lines of action enabled relevant rise on the net present value (NPV) and also in the Recovery Factor, both seen in the end of the project. Considering the Case_36 of the mesh that has 300m, the Recovery Factor increased from 45,66% to 50,24%, a rise of almost 5 percentage points on the volume of oil recovered. In the light of what was presented, it may be perceived that the operations that alter (ascending or descending) the flow of water injection or that change the mesh?s layout on the field improve the profitability, reducing costs from the water injection, treatment and disposal of the produced water, increasing the duration of viability of the project. However, it is important to highlight that, in some cases, applying the lines of action, the final recovery factor is lower, but still the reductions of the operational costs will make the operation viable.