Made available in DSpace on 2014-12-17T14:53:20Z (GMT). No. of bitstreams: 1 HaroldoCVF_DISSERT.pdf: 3858837 bytes, checksum: 6cd56f5660d8fba1ac3b326e3b91ccbc (MD5) Previous issue date: 2013-11-18 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Performance measurement in highly competitive markets is a necessary measure for those who aim the top positions. The business performance measurement approach have reached relevant results in the literature, however, a different approach has recently appeared that broadened the perception of competition, where companies do not seek the competition among companies only, but also among supply chains. Brazilian Wind energy supply chain is living a structuring and expanding moment, with the major global players in the industry making investments in the country. This research aims to answer which are the key performance indicators that must be considered by the Brazilian wind energy sector companies, which are part in a broad perspective of supply chain competition. The research was executed in two steps: exploratory (literature review and a field research in the companies) and later a survey was conducted with the Brazilian Wind energy companies workers with the purpose to validate the performance indicators found in the exploratory step. The survey evaluated 40 performance indicators distributed among five major activities: Project prospection, building/execution, operation and maintenance, logistics and transverse processes, which summarize the performance of the entire supply chain, pointing the sinergy and the competitive level of the supply chain. The selected performance indicators reflect the high relevance of the costs dimension in the Brazilian energy companies performance, acting as a key performance indicator, is also indicates the limited performance management integration throughout the Brazilian wind energy supply chain / A medi??o de desempenho em mercados competitivos ? uma a??o necess?ria para as organiza??es que almejam posi??es de destaque. A abordagem de medi??o interna ?s empresas j? obt?m resultados relevantes na literatura, entretanto, surge recentemente uma abordagem que ampliou a percep??o de competi??o, onde empresas n?o visam apenas a competi??o entre si, mas entre cadeias de suprimentos. No Brasil, a cadeia de suprimentos da energia e?lica atravessa um momento de estrutura??o e crescimento, com a instala??o dos principais fabricantes de classe mundial no pa?s. Este trabalho busca responder quais indicadores de desempenho-chave devem ser utilizados pelas empresas do setor e?lico brasileiro, inseridos em uma perspectiva hol?stica de competi??o entre cadeias de suprimentos. A pesquisa foi realizada em duas etapas: explorat?ria (revis?o bibliogr?fica e pesquisa de campo) e posteriormente foi aplicado uma pesquisa survey com representantes das empresas que comp?em o setor e?lico objetivando validar os indicadores encontrados na etapa explorat?ria. Foram avaliados 40 indicadores distribu?dos ao longo das atividades de prospec??o, execu??o/constru??o, opera??o e manuten??o, log?stica e os indicadores transversais, os quais sintetizam a performance de toda a cadeia em conjunto, apontando a sinergia e o n?vel de competitividade da cadeia de suprimentos. Os indicadores de desempenho selecionados refletem a alta relev?ncia da dimens?o custos no desempenho das organiza??es do setor, sendo atualmente o elemento-chave do desempenho, bem como a integra??o limitada da gest?o de desempenho ao longo da cadeia

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2018-04-02T16:36:54Z No. of bitstreams: 1 CarlosEduardoDeAraujo_DISSERT.pdf: 1292241 bytes, checksum: 63a3df15cff0391bf9ac2d75aa897cca (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2018-04-09T23:01:27Z (GMT) No. of bitstreams: 1 CarlosEduardoDeAraujo_DISSERT.pdf: 1292241 bytes, checksum: 63a3df15cff0391bf9ac2d75aa897cca (MD5) / Made available in DSpace on 2018-04-09T23:01:27Z (GMT). No. of bitstreams: 1 CarlosEduardoDeAraujo_DISSERT.pdf: 1292241 bytes, checksum: 63a3df15cff0391bf9ac2d75aa897cca (MD5) Previous issue date: 2018-01-16 / No ?mbito da geografia escolar, o conte?do energia e?lica se destaca na compreens?o da sua necessidade como fonte de energia, sua import?ncia para vida em sociedade e para as atividades humanas, possuindo forte rela??o com o espa?o geogr?fico. Dentro da perspectiva espacial, esse conte?do relaciona-se com diferentes aspectos da realidade - economia, pol?tica, ambiente, sociedade, cultura etc. Situ?-lo na perspectiva espacial e trabalhando sua espacialidade, suas implica??es socioambientais e suas rela??es com as dimens?es da realidade, resultar? na sua compreens?o como inerente no entendimento do espa?o geogr?fico. Diante disso, esta pesquisa prop?e-se a analisar o conte?do da energia e?lica e seu desenvolvimento no ensino de geografia. Al?m de a entender como se apresenta esse conte?do no ensino de geografia, a rela??o entre este e o professor e as rela??es intensas com a metodologia e os recursos de ensino, Este trabalho justifica-se como a contribui??o que a pesquisa poder? trazer para a compreens?o das rela??es que envolvem esses variados elementos do processo de ensino. O percurso metodol?gico d?-se, inicialmente, com o levantamento bibliogr?fico, seguido de an?lise do conte?do de energia e?lica presente nos livros did?ticos e de aplica??o de question?rio com professores de geografia. Apesar da import?ncia da energia e?lica enquanto atividade econ?mica em expans?o, sua abordagem na geografia escolar ainda possui lacunas em n?o apresentar sua espacialidade e seus impactos socioambientais, cruciais para entend?-lo dentro da perspectiva geogr?fica. O conte?do de energia e?lica presente em livros did?ticos atuais tamb?m necessita de complementa??o, principalmente no que se refere a materiais que foquem esse tema na perspectiva geogr?fica, principalmente outros recursos de ensino, como paradid?ticos, mapas, e jogos, al?m de novas metodologias. / In school geography scope, Wind Power theme stands out due to its attribution as a power source as well as its relevance for the social life and human activities, while it is strongly related to the geographic space. According to space perspective, this subject-matter is related to many reality aspects, along with economics, politics, environment, society, culture, etc. The present work locates this topic according to space perspective while describes its spatiality, its socio-environmental implications and its relations with reality dimensions, in order to understand it as inherent to recognition of geographic space. On this, the aim of the present research was to analyze the theme of Wind Power and its development in the teaching of geography. The understanding of how this topic presents itself in the teaching of geography; the affinity between the teacher and this matter, as well as the relation between the theme and methodology and teaching resources constitute the contribution that this research can bring to the understanding of the relationships that involve these many elements of the teaching process. The applied methodology consisted of a bibliographic survey followed by analysis of the Wind Power theme found in textbooks, as well as application of questionnaire directed to geography teachers. Despite the importance of wind energy as an expanding economic activity, studies on this subject in school geography still have gaps regarding the non-verification of the spatiality and its social and environmental impacts, which are crucial to understanding the subject within the geographical perspective. The content on Wind Power in textbooks is also insufficient and needs complementation, remarkably with regard to contents that focuses on this theme from a geographical perspective, mostly teaching resources alternative to traditional ones, such as extra-textbooks, maps and games, in addition to new methodologies.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-01-03T19:47:52Z No. of bitstreams: 1 EdnaldoEmilioFerraz_DISSERT.pdf: 2328888 bytes, checksum: 927c4675ea23aa914c8ccbe1b366eb1a (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-01-05T21:39:20Z (GMT) No. of bitstreams: 1 EdnaldoEmilioFerraz_DISSERT.pdf: 2328888 bytes, checksum: 927c4675ea23aa914c8ccbe1b366eb1a (MD5) / Made available in DSpace on 2017-01-05T21:39:20Z (GMT). No. of bitstreams: 1 EdnaldoEmilioFerraz_DISSERT.pdf: 2328888 bytes, checksum: 927c4675ea23aa914c8ccbe1b366eb1a (MD5) Previous issue date: 2015-03-06 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O presente trabalho analisa o processo de implementa??o de uma usina e?lica tendo como refer?ncia emp?rica o assentamento Zumbi/ Rio do Fogo no Rio Grande do Norte, primeiro assentamento rural do Brasil a instalar um parque e?lico. O objetivo da pesquisa foi entender os desdobramentos s?cio-territoriais da imbrica??o desses processos, a saber: a cria??o do assentamento rural (a partir de 1987) e a instala??o do parque e?lico (a partir de 2005-6). Por meio de entrevistas com assentados e com gestores p?blicos verificou-se que o processo de instala??o deste parque e?lico foi, desde o princ?pio, marcado por rela??es desiguais entre assentados, INCRA, representantes das empresas e gestores municipais. Al?m disso, sua presen?a revela um conjunto de metamorfoses de cunho social, econ?mico, pol?tico e cultural, marcando claramente a reconfigura??o desse territ?rio, tais como: tentativa de pecuariza??o, a gradativa diminui??o das culturas de autoconsumo, o reordenamento territorial, com perda crescente do dom?nio das ?reas pelos assentados, aumento dos conflitos internos, o acirramento das disputas pelas terras do assentamento por atores externos. Identificou-se que apesar da cria??o do assentamento os agricultores v?m perdendo progressivamente o direito ao acesso a terra, embora exista todo um aparato, inclusive jur?dico, para negar tal situa??o. / This paper analyzes the implementation process of a wind farm as its empirical reference the Zombie settlement / Rio do Fogo no Rio Grande do Norte, the first rural settlement in Brazil to install a wind farm. The objective of the research was to understand the social and territorial consequences of the overlap of these processes, namely: the creation of rural settlement (from 1987) and the installation of the wind farm (from 2005-6). Through interviews with settlers and public managers was found that the installation process of this wind farm was, from the beginning, marked by unequal relations between settlers, INCRA, business representatives and municipal managers. Moreover, its presence reveals a set of transformations of social, economic, political and cultural, clearly marking the reconfiguration of the territory, such as an attempt to cattle breeding, the gradual reduction in self-consumption crops, the territorial reorganization, with increasing loss field of areas by the settlers, increased internal conflicts, the intensification of disputes over nesting grounds by external actors. It was found that despite the creation of the settlement farmers are gradually losing the right to access to land, although there is a whole apparatus, including legal, to deny such a situation.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-02-20T23:54:39Z No. of bitstreams: 1 RenatoScaliaZanferdini_DISSERT.pdf: 3142775 bytes, checksum: 2e9507c44637e869d0a36a9c4f34ea37 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-02T23:50:30Z (GMT) No. of bitstreams: 1 RenatoScaliaZanferdini_DISSERT.pdf: 3142775 bytes, checksum: 2e9507c44637e869d0a36a9c4f34ea37 (MD5) / Made available in DSpace on 2017-03-02T23:50:30Z (GMT). No. of bitstreams: 1 RenatoScaliaZanferdini_DISSERT.pdf: 3142775 bytes, checksum: 2e9507c44637e869d0a36a9c4f34ea37 (MD5) Previous issue date: 2016-07-28 / A disserta??o tem como objetivo fazer uma an?lise sobre emprego, a quem pertence os parques e?licos e ?rea planta nas de Jo?o C?mara, Guamar? e Rio do Fogo. Para perceber se o setor de e?licas consegue desenvolver a qualidade de vida da popula??o nas cidades em que s?o implementados. A disserta??o em sua primeira parte apresenta um breve hist?rico da energia no pa?s. Em um segundo momento analisar? quais os motivos pelos quais levaram esse setor a n?o se desenvolver anteriormente no Brasil, consequentemente no estado potiguar e posteriormente far? uma an?lise do que levou esse setor a se desenvolver de 2006 at? os dias atuais. Em um terceiro momento faz uma an?lise da composi??o acion?rias dos parques. Por final avaliar? dados, tanto econ?micos quanto sociais, para identificar se h? impactos dessa ind?stria na vida dos cidad?os. O resultado mostra que apesar de gerar empregos na sua maioria tempor?rios as e?licas recoloca o estado do Rio Grande do Norte como um estado subdesenvolvido produtor de mat?ria prima para estados mais desenvolvidos. Outra conclus?o ? que h? pequenos avan?os na vida social. / The dissertation aims to make an analysis of employment and ownership structure of the wind farms in the state of Rio Grande do Norte, specifically in the cities of Jo?o C?mara, Guamar? and Rio do Fogo. On that basis, it aims to understand the eolic energy sector as the main agent to improve the quality of life on these regions. To better measure this, the work is divided into a historical study on energy structure in Brazil, analyzing what reasons led these industry did not to develop - both in Brazil and in the state of Rio Grande do Norte - before 2006 and check the reasons why the industry begins to develop. In addition, using economic and social data seeks to identify if there are impacts of this industry on the lives of citizens. Finally, the results show that most jobs are temporary and the eolic industry is unable to modify the RN condition of undeveloped state, producing raw material for more developed states. Another conclusion is that there are small advances in social life.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-03-14T22:20:59Z No. of bitstreams: 1 IsaacNewtonLucenaFernandesDeQueiroz_DISSERT.pdf: 13416870 bytes, checksum: fac93ca661cac003c1faf22b8931fecd (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-16T18:40:57Z (GMT) No. of bitstreams: 1 IsaacNewtonLucenaFernandesDeQueiroz_DISSERT.pdf: 13416870 bytes, checksum: fac93ca661cac003c1faf22b8931fecd (MD5) / Made available in DSpace on 2017-03-16T18:40:57Z (GMT). No. of bitstreams: 1 IsaacNewtonLucenaFernandesDeQueiroz_DISSERT.pdf: 13416870 bytes, checksum: fac93ca661cac003c1faf22b8931fecd (MD5) Previous issue date: 2016-12-09 / Sob o ponto de vista econ?mico, o aproveitamento do potencial e?lico trouxe ao estado do Rio Grande do Norte vultosos investimentos de capital nacional e estrangeiro, transformandose em interesse pol?tico priorit?rio e representando uma alternativa ? depend?ncia do regime hidroel?trico que predomina no pa?s. Tal matriz energ?tica tem ainda um vi?s ambiental, na medida em que seus impactos no meio f?sico s?o comparativamente menores. Ademais, ? considerada pelos acordos internacionais do clima, como a principal alternativa sustent?vel para o controle do efeito estufa a partir da redu??o da queima de combust?veis f?sseis. Contudo, a implanta??o de torres e?licas tem gerado quest?es sociais graves, identificados em estudos ao redor do mundo, especialmente no que tange ? apropria??o de territ?rios, impactos paisag?sticos, ru?dos, dentre outros. Trata-se de uma quest?o de injusti?a ambiental, onde os efeitos nocivos da atividade recaem justamente sobre os mais desamparados. Particularmente, seus efeitos tamb?m podem ser sentidos no munic?pio de S?o Miguel do Gostoso, localizado no litoral setentrional do RN. Na comunidade de Morro dos Martins, onde se desenvolveu a pesquisa, essa problem?tica se repetiu, ainda que em 2011 o empreendimento tenha sido objeto de um procedimento de licenciamento ambiental previsto na lei brasileira. A problem?tica surge, ent?o, em verificar se o licenciamento alcan?a seus objetivos no tocante ao lado social da sustentabilidade e, tamb?m, se este possui um car?ter democr?tico. Para tanto, foi realizada uma observa??o participante no local, bem como foi analisado o processo em quest?o e obtidos dados diretos da Prefeitura do Munic?pio. Durante a observa??o, foram realizadas 20 entrevistas com moradores que venderam suas terras ? empresa que construiu o parque. Dentre os resultados, observou-se que a popula??o vendeu suas terras ? empresa, assediados pelo dinheiro e desamparados pelas institui??es, e agora n?o t?m mais como produzir, bem como fizeram mau uso do produto da venda dos seus bens. Al?m disso, os moradores se queixam da in?rcia do ?rg?o ambiental na defesa de seus interesses, sendo que os regulamentos n?o concedem poder algum de decis?o ?s pessoas diretamente afetadas pelos impactos das obras, o que n?o se traduz em ferramenta verdadeiramente democr?tica. Conclui-se que somente ap?s a ado??o de m?todos que contemplem a participa??o da popula??o de maneira efetiva, atendendo aos princ?pios da justi?a ambiental, bem como a cria??o de uma associa??o que represente os interesses populares e os defenda em face de novas arbitrariedades. / From the economic point of view, the exploitation of the wind potential brought to the state of Rio Grande do Norte large investments of national and foreign capital, becoming a priority political interest and representing an alternative to the dependence of the hydroelectric regime that prevails in the country. This energy matrix also has an environmental bias, insofar as its impacts on the physical environment are comparatively smaller. In addition, it is considered by international climate agreements as the main sustainable alternative for controlling the greenhouse effect by reducing the burning of fossil fuels. However, the deployment of wind towers has generated serious social issues, identified in studies around the world, especially in what concerns the appropriation of territories, landscape impacts, noise, among others. It is a question of environmental injustice, where the harmful effects of the activity fall precisely on the most helpless. In particular, its effects can also be felt in the municipality of S?o Miguel do Gostoso, located on the northern coast of the RN. In the community of Morro dos Martins, where the research was developed, this problem was repeated, even though in 2011 the project was subject to an environmental licensing procedure provided according to the brazilian law. The problem then arises in verifying if licensing reaches its objectives with respect to the social side of sustainability and also if it has a democratic character. For that, a participant observation was carried out in the place, as well as the process in question was analyzed and direct data obtained from the Municipality. During the observation, 20 interviews were conducted with residents who sold their land to the company that built the park. Among the results, it was observed that the population sold their lands to the company, harassed by the money and abandoned by the institutions, and now they have no more how to produce, as well as they made misuse of the product of the sale of their goods. In addition, residents complain about the environmental agency's inertia in defending its interests, and the regulations do not grant any decision power to those directly affected by the impacts of the works, which does not translate into a truly democratic tool. It is concluded that only after the adoption of methods that contemplate the participation of the population in an effective way, taking into account the principles of environmental justice, as well as the creation of an association that represents popular interests and defends them in the face of new arbitrariness.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-11-01T21:26:18Z No. of bitstreams: 1 IsaqueRenovatoDeAraujo_DISSERT.pdf: 831101 bytes, checksum: 9e8fc92c0ea997de47c3bf464cb71271 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-11-07T23:24:42Z (GMT) No. of bitstreams: 1 IsaqueRenovatoDeAraujo_DISSERT.pdf: 831101 bytes, checksum: 9e8fc92c0ea997de47c3bf464cb71271 (MD5) / Made available in DSpace on 2017-11-07T23:24:42Z (GMT). No. of bitstreams: 1 IsaqueRenovatoDeAraujo_DISSERT.pdf: 831101 bytes, checksum: 9e8fc92c0ea997de47c3bf464cb71271 (MD5) Previous issue date: 2017-07-31 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O presente trabalho buscou compreender e analisar de que maneira uma empresa enquadrada como agente no mercado livre de energia possui sua estrat?gia percebida por seu gestor, sendo utilizado para tal estudo as cinco for?as competitivas, relacionando-as com as estrat?gias gen?ricas para, dessa forma, compreender como o mercado ? caracterizado, juntamente com a percep??o do gestor acerca dele e as for?as de Porter no mercado de energia e?lica. Para tanto, utilizou-se de question?rio Likert listando quest?es com as cinco for?as, sendo tamb?m feitos coment?rios junto as quest?es visando preencher lacunas que pudessem vir a aparecer observadas pelo question?rio. Como resultado p?de-se compreender nuances do mercado quanto a sua dimens?o e especificidades, tanto de maneira mais abrangente como com enfoque no mercado livre de energia, quanto ao gestor foi poss?vel compreender a posi??o de sua empresa no mercado e tamb?m sua forma de atua??o no mesmo, sendo ainda poss?vel fazer an?lise a partir das cinco for?as na forma como os demais players no mercado atuam quanto e suas estrat?gias gen?ricas. A pesquisa serviu n?o somente para elucidar a forma que o mercado crescente de renov?veis est? sendo trabalhada, mas tamb?m foi satisfat?ria quanto a seu questionamento principal que visava entender como ela atuava na busca por vantagem competitiva e como ? a rela??o com as cinco for?as / The present work sought to identify and analyze how a company classified as an agent in the free energy market has its strategy perceived by its manager, being used for such study the five forces of Porter, relating them with the generic strategies, in this way Understand how the market is characterized along with the manager's perception about it and Porter's strengths in the wind power market. To do this, a Likert questionnaire has been used, listing questions with the 5 forces, and comments were also made in the questions to fill in gaps that might appear to be observed by the questionnaire.As a result, it was possible to understand market nuances as to its size and specificities, both more comprehensively and with a focus on the free energy market, as the manager was able to understand the position of his company in the market and also his way of acting in the market. Even though it is still possible to analyze the five forces in the way other players in the market act as their generic strategies. The research served not only to elucidate the way in which the growing renewable market is being worked on, but was also satisfactory in its main question that aimed to understand how it worked in the search for competitive advantage and how is the relationship with the five forces

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2015. / Made available in DSpace on 2016-05-24T17:49:11Z (GMT). No. of bitstreams: 1 338909.pdf: 2482498 bytes, checksum: c98eff9e171fefbe36a554d371c310a8 (MD5) Previous issue date: 2015 / O presente trabalho tem como foco o problema da reserva operacional de longo prazo dos SEE. Com o aumento da geração renovável, neste caso a geração eólica incrementa-se a variabilidade e as incertezas no SEE. O que leva a aceitação do risco na operação do SEE e também no atendimento no fornecimento da carga.à neste sentido que são introducidas as métricas de risco VaR e CVaR com o objetivo de uxiliar a os planejadores dos SEE no que respeita ao desenho da flexibilidade do sistema de geração do SEE.Aproveitando uma das vondades ou características da SMCS em na providência das distribuições de probabilidade das variáveis inseridas no problema da reserva operacional de longo prazo é feito os respectivos cálculos e analises destas distribuições para explorar e caracterizar o SEE no que respeita a quantificação da reserva operacional de longo prazo.A presente metodologia é aplicada ao sistema teste de avaliações de confiabilidade IEEE-RTS-96HW gerando resultados adequados em dito sistema.<br> / Abstract : The present work focuses on the problem of operating reserves of long-term of EES. With increasing renewable generation, wind power generation in this case, is increased variability and uncertainties in the EES. Which leads to acceptance of the risk in the Electric Energy System (EES) operation and also in the service provider charge.In this sense it is introduced the VaR and CVaR risk metrics in order to assist the planners of the EES as regards the design of the flexibility of the EES generation system.Taking advantage of the goodness or characteristics of the Sequential Monte Carlo Simulation (MCS) in the providence of the probability distributions of the variables inserted in the problem of long-term operating reserve is made their calculations and analysis of these distributions to explore and characterize the EES as regards quantification the long-term operating reserve.This methodology is applied to the assessment test system IEEE-RTS-96HW reliability producing adequate results in this system.

Submitted by Setor de Tratamento da Informa??o - BC/PUCRS (tede2@pucrs.br) on 2015-11-12T11:46:12Z No. of bitstreams: 1 476059 - Texto Completo.pdf: 11820335 bytes, checksum: 97522b958c96b8b2b663777e9ec46881 (MD5) / Made available in DSpace on 2015-11-12T11:46:12Z (GMT). No. of bitstreams: 1 476059 - Texto Completo.pdf: 11820335 bytes, checksum: 97522b958c96b8b2b663777e9ec46881 (MD5) Previous issue date: 2015-08-17 / This dissertation proposes novel control schemes in order to track periodic references and/or reject periodic disturbances with time-varying frequency. The proposed methodology is based on a ?-domain concept, where the interest signals possess a constant period. By employing the Internal Model Principle, this domain allows the design of linear controllers that ensure tracking and/or rejection performance to the targeted class of signals. The main objective is, then, to transform these controllers dynamical description from ?-domain to the usual time domain. This idea was explored to modify the Resonant and Repetitive Controllers, traditional approaches based on the Internal Model Principle, yielding Transformed Resonant and Repetitive Controllers, the proposed control schemes that deal with large period variations. Robust control methodologies based on Linear Matrix Inequalities are presented in order to synthesize the controllers parameters and assure robust closed-loop stability and performance. The advantages of the proposed control architectures, in comparison to traditional strategies, are evaluated by simulated applications with time-varying period signals, such as eccentric direct current motors, frequency inverters and wind turbines. Besides the continuous time formulation, this work presents discrete time synthesis methodologies and implementation of the Transformed Resonant and Repetitive Controllers. In the end, experimental results with an eccentric direct current motor show the benefits of the proposed controllers in contrast to the traditional ones. / Esta disserta??o prop?e novas topologias de controle para o seguimento de sinais de refer?ncia peri?dicos e/ou rejei??o de sinais de dist?rbio peri?dicos quando a frequ?ncia destes sinais ? variante no tempo. A metodologia proposta baseia-se na constru??o de controladores em um novo dom?nio-?, onde os sinais de interesse podem ser representados com per?odo constante. Neste dom?nio, ? poss?vel empregar o Princ?pio do Modelo Interno para o projeto de controladores lineares que garantem desempenho de seguimento e/ou rejei??o para estes sinais. O objetivo central deste trabalho ?, portanto, uma metodologia para transforma??o da representa??o din?mica de controladores definidos no dom?nio-? para o usual dom?nio do tempo. Esta ideia foi explorada para modifica??o dos Controladores Ressonante e Repetitivo, abordagens do Princ?pio do Modelo Interno tradicionais na literatura para tratamento de sinais peri?dicos, originando os Controladores Ressonante e Repetitivo Transformados, as topologias de controle propostas que consideram ampla varia??o no per?odo dos sinais. Para realizar o projeto dos par?metros destas arquiteturas de controle e garantir estabilidade e desempenho robusto em malha-fechada, s?o consideradas metodologias de s?ntese robusta baseadas em Desigualdades Matriciais Lineares. As vantagens das estrat?gias de controle propostas, em rela??o ?s abordagens tradicionais, s?o demonstradas por meio de simula??es de aplica??es pr?ticas que apresentam per?odo variante no tempo, como motores de corrente cont?nua com cargas exc?ntricas, inversores de frequ?ncia trabalhando com tens?es alternadas de frequ?ncia fundamental vari?vel e turbinas e?licas. Al?m da formula??o em tempo cont?nuo, este trabalho apresenta ao final uma metodologia de projeto e implementa??o em tempo discreto dos Controladores Ressonante e Repetitivo Transformados. Resultados experimentais com um motor de corrente cont?nua exc?ntrico, por fim, comprovam os benef?cios das estrat?gias de controle propostas em rela??o aos controladores tradicionais.

Made available in DSpace on 2014-12-17T13:53:37Z (GMT). No. of bitstreams: 1 JoaoPCM_DISSERT.pdf: 2393754 bytes, checksum: f95d47c17e14c0db5625ca5a0ae4656d (MD5) Previous issue date: 2014-01-21 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Offshore wind power emits low amounts of gases, is renewable and has better performance than onshore due to its greater stability and higher wind power density, less visual and noise impact, among others. Brazil has a high capacity of generation, but has not yet developed any offshore projects. High costs are a strong impediment. This study is an effort towards pricing offshore resources through Livelized Cost of Energy - LCOE, which represents the minimum return to cover the costs of development, production and maintenance of a wind project. Initially LCOE was calculated for all Brazilian onshore wind farms listed at Bloomberg New Energy Finance R?, accounting for 71 farms. Then hypothetical offshore wind farms were created from the onshore farms, tripling the cost of generation, which is consistent with the literature, and estimating the offshore energy for two locations off the Brazilian coast using satellite data extracted from National Oceanic and Atmospheric Administration. The results demonstrate that offshore resources have the potential to significantly reduce the energy price due to the better performance of the wind at sea / A fonte de energia e?lica offshore emite baixas quantidades de gases causadores do efeito estufa, ? renov?vel e apresenta melhor desempenho do que a fonte onshore em quesitos como maior estabilidade e densidade de pot?ncia dos ventos, menor impacto visual e sonoro, dentre outros. O Brasil possui uma capacidade de gera??o offshore substancialmente elevada, mas ainda n?o desenvolveu nenhum projeto nessa modalidade. Os custos elevados s?o um forte empecilho. Esse estudo ? um esfor?o em dire??o ? explora??o desse campo, precificando a fonte offshore atrav?s do Livelized Cost of Energy LCOE, que representa o retorno m?nimo para cobrir os custos de desenvolvimento, produ??o e manuten??o de um projeto e?lico. O LCOE foi primeiramente calculado para todos os parques e?licos onshore brasileiros listados no Bloomberg New Energy Finance R?, contabilizando 71 parques. Em seguida foram criados parques e?licos offshore hipot?ticos a partir dos parques onshore, triplicando os custos de gera??o, o que est? em conformidade com a literatura especializada, e estimando-se a energia offshore para dois pontos da costa brasileira atrav?s de dados de sat?lite extra?dos do National Oceanic and Atmospheric Administration. Os resultados demonstram que a fonte offshore tem o potencial de reduzir significativamente o pre?o da energia devido ? melhor performance do vento no mar

Made available in DSpace on 2014-12-17T14:55:08Z (GMT). No. of bitstreams: 1 FranciscoAFM.pdf: 1422041 bytes, checksum: 5ba006636ee4d36b274ed24d386fab11 (MD5) Previous issue date: 2007-12-21 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / At present, the electricity generation through wind energy has an importance growing in the world, with the existence of very large plans for future wind power installation worldwide. Thus, the increasing the electricity generation through wind power requires, more and more, analysis of studies of interaction between wind parks and electric power systems. This paper has as purposes to implement equivalent models for synchronous wind generators to represent a wind park in ATP program and to check behavior of the models through simulations. Simulations with applications of faults were achieved to evaluate the behavior of voltages of system for each equivalent model, through comparisons between the results of models proposed, to verify if the differences obtained allows the adoption of the simplest model / A gera??o de eletricidade atrav?s da energia e?lica teve, recentemente, um importante crescimento em todo planeta, com a exist?ncia de v?rios planos de instala??es de pot?ncia e?lica para o futuro. Dessa forma, o aumento na gera??o de eletricidade atrav?s da energia e?lica requer, cada vez mais, an?lise de estudos da intera??o entre os parques e?licos e os sistemas el?tricos de pot?ncia. Este trabalho tem como objetivos implementar modelos equivalentes de aerogeradores s?ncronos para representar um parque e?lico no programa ATP e examinar o comportamento dos modelos atrav?s de simula??es. Simula??es com aplica??es de faltas foram realizadas para avaliar o comportamento das tens?es do sistema para cada modelo equivalente, atrav?s de compara??es entre os resultados dos modelos propostos, para verificar se as diferen?as obtidas permitem a ado??o do modelo mais simples