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INFLUENCE OF ACCURATE SOIL REPRESENTATION FOR TRANSMISSION-LINE PARAMETERS: ANALYSIS BASED ON CARSON’S MODIFIED FORMULATIONS João Bosco Gertrudes, Maria Cristina Dias Tavares, Carlos Medeiros Portela In: IEEE Transmission and Distribution Latin America 2010 Sáo Paulo, SP Nov-2010 pp:1-6 Abstract: In this paper the influence of earth’s conductivity and permittivity frequency dependence are evaluated when calculating transversal and longitudinal transmission lines’parameters directly from numerical integration of Carson’s modified expressions. As an example of the importance of properly considering the frequency-dependent soil model, an actual 440 kV single three-phase transmissionline was represented, comparing the longitudinal and transversal parameters considering the earth’s conductivity and permittivity frequency dependence soil model in relation to the common soil representation with a constant conductivity and permittivity that can be neglected assuming a low frequency approximation. Keywords: Soil model, Line parameters, Frequency dependence, Electromagnetic transients Influência dos Parâmetros Transversais de uma Linha de Transmissão na Redução da Corrente de Arco Secundário durante a manobra de abertura monopolar Milton Elvis Zevallos Alcahuaman, Maria Cristina Dias Tavares In: IEEE Transmission and Distribution Latin America 2010 São Paulo, SP Set-2010 pp:1-6 Abstract: A successful single-pole opening/reclosure procedure after single-phase faults in the EHV transmission lines requires parameters optimization for each transmission system. This paper shows the influence of transmission line transverse parameters together with reactive shunt compensation parameters in the reduction of secondary arc current after single-pole opening procedure for non-permanents faults. It is proposed a method to reduce the mutual coupling between phases in a three-phase system representation at fundamental frequency. Some simulations of transient overvoltage for different cases with optimized neutral reactors were performed with the ATP program. Keywords: Neutral Reactor, Secondary Arc Current, Single-Phase Opening Maneuver, Sustained Response, Three-Phase ABCD Elements, Unbalanced System. Matriz de transformação real e constante para análise de linhas de transmissão com extensão para duas linhas trifásicas com circuito duplo José C. C Campos, Afonso J. Prado, Sérgio Kurokawa, Luiz F. Bovolato, José Pissolato Filho In: XVIII Congresso Brasileiro de Automática (CBA 2010)- Antonio Padilha Feltrin(Ed.) - ISBN: 978-85-61507-02-2 SBA - Sociedade Brasileira de Automática – Bonito(MS) - Brasil Set-2010 Abstract: The frequency independent real phase-mode transformation matrix application is analyzed for typical double three phase transmission lines. This transformation matrix is obtained from eigenvector of analyzed line considering this line in the ideal transposition. Determining the transformation matrix, it is based on Clarke’s matrix. For transposed double three phase transmission lines, the real phase-mode transformation matrix leads to diagonal impedance and admittance matrices in mode do-main. For untransposed cases, error analyses are carried out using this constant phase-mode transformation matrix and comparing to the results obtained from the eigenvectors. Keywords: Eigenvector, eigenvalue, frequency, transmission lines, Clarke’s matrix, phase-mode transformation Método baseado em lógica nebulosa para inserção de geração distribuída sob a óptica do perfil de tensão Leonardo A. Gomes, Carlos Alberto Favarin Murari, Ahda P. G. Pavani In: XVIII Congresso Brasileiro de Automática (CBA 2010)- Antonio Padilha Feltrin(Ed.) - ISBN: 978-85-61507-02-2 SBA - Sociedade Brasileira de Automática – Bonito(MS) - Brasil Set-2010 pp:2775-2782 Abstract: This work consists of proposing a method based on Fuzzy Logic to obtain an index that classifies the most suitable buses to connect a distributed generator with an electric power distribution system. The method has been developed taking account the difficulty in keeping a suitable voltage profile in distribution systems, which favors large index values for the buses where the connection of generators results in a more suitable voltage profile. Another aspect included in the method is the minimization of the power losses. Applying a set of fuzzy rules, the index has been calculated through setting membership values to the bus voltage and load real power. One of the advantages of this method is the possibility to classify the variables into fuzzy sets that allow the linguistic translation of the system operator’s knowledge and consequently their experience of operating the system can be employed in the process of allocating distributed generators in the system. When compared to traditional techniques, our method does not require consecutive runs of power flows. It is necessary to obtain the operating state of the network through only one power flow in the base case. Keywords: Distribution networks, distributed generation, fuzzy logic, uncertainties, fuzzy numbers Método prático para a avaliação do impacto da partida direta de motores de indução no afundamento de tensão Cecília F. Morais, Diogo Salles, Paulo C. M. Meira, Ahda P. G. Pavani, Walmir Freitas, Wilsun Xu In: XVIII Congresso Brasileiro de Automática (CBA 2010)- Antonio Padilha Feltrin(Ed.) - ISBN: 978-85-61507-02-2 SBA - Sociedade Brasileira de Automática – Bonito(MS) - Brasil Set-2010 pp:2768-2774 Abstract: The impact of motor starting on power quality can be assessed using numerous and complex computer dynamic simulation studies. However, utility engineers have become more interested in practical techniques that enable fast and reliable assessment of new motor installation proposals, so that studies of several cases can be conducted. In this context, the objective of this paper is to present a graphical method that consists of simple analytical formulas to determine the maximum motor size that can be connected to a particular distribution system without exceeding the acceptable values of voltage sags established by the utility grid. Basically, the proposed method provides a curve relating, for a particular voltage sag permissible limit, the distribution system shortcircuit level to the maximum induction motor size that can be installed. Additionally, it is possible to determine, through a sensitivity analysis, the influence of power grid and motor parameters on the behavior of these curves. The results have proven to be accurate when compared to those obtained by repeated electromagnetic transient simulations. Keywords: Induction motor, motor starting, power quality, voltage sags 80 Sinopse da FEEC
Métodos de Pontos Interiores Aplicados ao problema de Pré-Despacho com Manobras Programadas Silvia Maria Simões de Carvalho, Aurelio Ribeiro Leite de Oliveira, Christiano Lyra Filho In: XVIII Congresso Brasileiro de Automática (CBA 2010)- Antonio Padilha Feltrin(Ed.) - ISBN: 978-85-61507-02-2 SBA - Sociedade Brasileira de Automática – Bonito(MS) - Brasil Sep-2010 pp:1-3 Abstract: In this work, the primal-dual interior point methods are used to minimize the DC predispatch generation and transmission costs and loss on hydroeletric power systems. The model considers the network topology modification schedulling. A matrix structure study is also performed considering the changes that occurs in the system. We stress that the computational effort to solve a problem with network topology modification is close to the effort for solving the problem without it. Computer results with IEEE test and real Brazilians sytems reinforce this statement. A new network topology modification simulation of maneuvers through transmission lines bound reduction is presented. The new approach is compared with the explicit toppology modification version. Keywords: Interior Point Methods, Predispatch, Hydroeletric Systems. Modelagem do Interline Power Flow Controller (IPFC) no Fluxo de Carga e Análise de Carregamento do Sistema Do Valle, D. B., Igor Kopcak, Vivaldo Fernando Da Costa In: III Simpósio Brasileiro de Sistemas Elétricos Belém, PA Set-2010 pp:1-6 Abstract: O interline power flow controller (IPFC) é a última geração dos flexible AC transmission systems (FACTS) que se destina ao controle e gerenciamento dos fluxos de potência em múltiplas linhas de transmissão numa dada subestação. O presente artigo apresenta a inclusão deste dispositivo no fluxo de carga baseado no método convencional de Newton-Raphson. O modelo de injeção de potência do IPFC é utilizado por facilitar sua incorporação em programas de fluxo de carga e fluxo de carga ótimo. Análises de simulações demonstram que o IPFC pode ser utilizado para resolver problemas complexos de congestionamentos de fluxos de potência, eliminando sobrecargas em linhas de transmissão. Entretanto, em situações particulares o modo de controle de fluxo de potência constante do IPFC pode diminuir a margem de estabilidade de tensão do sistema. Keywords: Flexible AC Transmission Systems (FACTS), Fluxo de Carga, Gerenciamento de Congestionamento, Interline Power Flow Controller (IPFC), Sistemas de Potência. Modulação por Acionamento Rotativo Aplicado a Inversor Cascata Simétrica Ernesto Kenji Luna, Jose Antenor Pomilio In: XVIII Congresso Brasileiro de Automática (CBA 2010)- Antonio Padilha Feltrin(Ed.) - ISBN: 978-85-61507-02-2 SBA - Sociedade Brasileira de Automática – Bonito(MS) - Brasil Sep-2010 pp:158-165 Abstract: This paper proposes a modulation strategy with the aim of reducing the commutation frequency in a symmetrical cascaded multilevel inverter in comparison with traditional modulation techniques, additionally resulting an uniform distribution of the commutations, better than in the Phase Shift modulation. Such improvements allow to increase the converter power, due to the lower switching devices stress. Keywords: Multilevel, Modulation Techniques, Symmetrical Cascaded Multicell Inverter and Pulse Width Modulation Newave versus Odin Comparação entre Modelo Estocástico e Determinístico no Planejamento da Operação Energética do Sistema interligado Nacional Monica de Souza Zambelli, André Emilio Toscano, Secundino Soares Filho, Erinaldo Farias Dos Santos, Luis Noguera In: XVIII Congresso Brasileiro de Automática (CBA 2010)- Antonio Padilha Feltrin(Ed.) - ISBN: 978-85-61507-02-2 SBA - Sociedade Brasileira de Automática – Bonito(MS) - Brasil Sep-2010 pp:347-354 Abstract: This paper presents a comparison between the NEWAVE model, which employs a stochastic approach by using Stochastic Dual Dynamic Programming (SDDP), and the ODIN model (Optimization of Brazilian Interconnected Hydrothermal Power System), which uses a deterministic approach with a network flow optimization algorithm. The ODIN model uses deterministic and nonlinear optimization with forecasted inflows, with detailed representation of the hydroelectric system by individual plants. The NEWAVE model uses an equivalent composite representation of interconnected subsystems. In order to perform a comparison on the same terms, the SUISHI-O model was used to decompose the strategy of the NEWAVE model into individualized plants. The ODIN model was compared to the NEWAVE SUISHI-O methodology for a case study based on data from the deck of CCEE for the PMO of September 2008, regarding the generation capacity expansion plan for December 2012. The results was obtained by simulation of 70 historical scenarios, indicating a significantly superior performance by the ODIN model, which leads to a more security and economic operation of SIN by more efficient use of water resources. Keywords: Energy Systems Planning, nonlinear optimization, stochastic optimization, reservoir operation, NEWAVE model, ODIN model. O uso de quadripolos trifásicos na obtenção da resposta sustentada de um sistema elétrico desequilibrado Milton E. Zevallos, Maria C. Tavares In: XVIII Congresso Brasileiro de Automática (CBA 2010)- Antonio Padilha Feltrin(Ed.) - ISBN: 978-85-61507-02-2 SBA - Sociedade Brasileira de Automática – Bonito(MS) - Brasil Set-2010 pp:1901-1908 Abstract: This paper proposes the use of three-phase twoports elements to obtain the sustained response of unbalanced electric power system. Representations of three-phase two-ports networks for various types of elements of the electrical power system are described. The methodology is applied to identify the optimum neutral reactor that minimizes the secondary arc current in a transmission system, thus enabling the single-phase open/reclose maneuver implementation. Keywords: Cascade Association, Sustained Response, Three-Phase ABCD Elements, Unbalanced System Otimização do Despacho Integrado da Geração Termoelétrica da produção e Transporte de Gás Natural Elma Pereira Santos, Takaaki Ohishi, Oderson Dias de Mello In: XVIII Congresso Brasileiro de Automática (CBA 2010)- Antonio Padilha Feltrin(Ed.) - ISBN: 978-85-61507-02-2 SBA - Sociedade Brasileira de Automática – Bonito(MS) - Brasil Sep-2010 pp:361-367 Abstract: Natural gas is a fossil fuel that can be used for electricity generation in thermoelectric power plants. Thus, the operation of natural gas supply system is affected by the dispatch of thermoelectric power plants, and operational constraints in the gas supply system may also affect thermoelectric plants dispatch. This operational dependence between these two systems requires a coordinated operation with the aim of obtaining a more effcient operation. This paper Academic Bulletin of FEEC-Unicamp 81
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Page 5 and 6: classical morphological segmentatio
Page 7 and 8: functions (e.g., medium access cont
Page 9 and 10: Abstract: Este trabalho mostra a ev
Page 11 and 12: Filtragem de Medidas Transmitidas p
Page 13 and 14: Keywords: Static output feedback, H
Page 15 and 16: Electronic, Micro-electronic, Opto-
Page 17 and 18: Atmospheric Pressure in the Amazon
Page 19 and 20: árvore pulmonar. Obstruções tota
Page 21 and 22: Keywords: Engenharia Clínica, Proj
Page 23 and 24: Recife, PE Oct-2010 pp:1-5 Abstract
Page 25 and 26: feasibility and usefulness are vali
Page 27: Abstract: This work analyzes the co
Page 31 and 32: Keywords: Localização de faltas,
Page 33 and 34: Keywords: amplificador óptico a se
Page 35 and 36: Macrobends effects in single-mode g
Page 37 and 38: intricate and impracticable, becaus
Page 39 and 40: 5 - On Building Meaning: A Biologic
Page 41 and 42: new cryptographic protocols, includ
Page 43 and 44: OPTIMAL CONTRACTS ALLOCATION FOR EL
Page 45 and 46: COMPACT FORWARDING: A PROBABILISTIC
Page 47 and 48: Acknowledgement Authors With great
Page 49 and 50: Luiz Carlos Barbosa Luiz Carlos Kre

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