Power System Restoration
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Análise de observabilidade baseada em variâncias de medidas estimadas = : Observability analysis based estimated measures variances / Observability analysis based estimated measures variances
The purpose of this work is to present a complete methodology for observability analysis of electric power systems. The observability of the network is determined from the trace of the covariance matrix of the measurement estimate, the variance of the estimated power flow allow the identification of observable islands and the restoration of observability is
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/08/2012
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2. Sistemas de medição fasorial sincronizada: aplicações na recomposição do sistema elétrico de potência
This master thesis investigates the impact of the Synchronized Phasor Measurement Systems on the Power System Restoration process. The viability of current and voltage phase angle measurement brings a significant improvement for electrical system restoration. One of the most complex actions during power system restoration is the closure of breakers between t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/07/2010
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3. Analysis of the marginal sealing of restorations after cavity preparation performed with laser Er,Cr:YSGG using different parameters in dentin / Análise do selamento marginal de restaurações realizadas após preparo cavitário com laser de Er;Cr:YSGG utilizando diferentes parâmetros em dentina hígida
The aim of this work was to evaluate dye penetration of Class V restorations in cavity preparations obtained with different power setting of an Er;Cr:YSGG laser or with diamond bur and high-speed handpiece. Sixty samples of dentin were divided into six groups (n=10). The first group served as a control with standardized diamond bur cut (G1); the other groups
Publicado em: 2010
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4. VOLTAGE STABILITY PROBABILISTIC ASSESSMENT IN COMPOSITE GENERATION AND TRANSMISSION SYSTEMS / ANÁLISE PROBABILÍSTICA DA ESTABILIDADE DE TENSÃO EM SISTEMAS COMPOSTOS DE GERAÇÃO E TRANSMISSÃO
In some countries, the electric power systems are operating near to their limits due to the absence of investments in the transmission network expansion and natural growth of the electricity demand. This operation condition can also occur in electric power systems in which the transmission expansion is carried out in appropriate way. In this case, the excess
Publicado em: 2009
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5. ELECTRIC DISTRIBUTION POWER SYSTEMS RELIABILITY OPTIMIZATION: An Approach Considering the Selection and Allocation of Protection and Switching Devices / OTIMIZAÇÃO DA CONFIABILIDADE DE SISTEMAS DE DISTRIBUIÇÃO DE ENERGIA ELÉTRICA: Uma Abordagem Considerando a Seleção e Alocação de Dispositivos de Proteção e Manobras
One of the main goals of the electric utilities is to provide energy to its customers in a reliable and low cost way. Traditionally, the electricity sector regulatory commissions impose continuity targets, which must be carried out, to avoid great penalties. For many years, the electric utilities have adopted the practice of allowing the increment of tempora
Publicado em: 2009
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6. LOAD MAXIMIZATION TOOL FOR ELECTRIC SYSTEM FLUENT RESTORATION / FERRAMENTA PARA MAXIMIZAÇÃO DE CARGA NA FASE FLUENTE DE RECOMPOSIÇÃO DE SISTEMAS ELÉTRICOS
This work proposes a methodology to help the studies related to eletric power systems fluent restoration. At this early restoration stage, power system is structured in long transmission corridors and the reactors set definition is one of the adopted strategies for overvoltages disposal. The proposed tool, based on an optimization model, aims the network pro
Publicado em: 2008
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7. Metodologia para otimizacao da recomposicao de sistemas eletricos baseada na busca tabu seletiva adaptativa / Methodology for optimization service restoration of electrical systems based adaptive selective Tabu search
This dissertation presents a methodology proposed to optimize the restoration of transmission electrical systems, as well as to develop a tool for training and support, in real time, to the system s operators to the System Operation Center - SOC. The proposed methodology, called Adaptive Selective Tabu Search, is based on the Tabu Search technique and some c
Publicado em: 2007
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8. Measurements quality and redundancy evaluation for power system state estimation / Avaliação da qualidade e redundância das medidas para estimação de estado em sistemas elétricos de potência
The operating center requires much information in order to control and supervise the power systems. In a secure power systems operation it is important that the state estimation process be reliable. For that purpose, in this work: i) a computer program to evaluate and increment the reliability of power system in terms of redundancy and measurements availabil
Publicado em: 2007
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9. Three-phase generalized state estimation / Estimação de estado generalizada trifasica
Since its introduction in 1969 by Fred C. Schweppe, J. Wildes and D. Rom, the power system state estimation has been widely studied. The state estimation is evolving to a more detailed modeling, which considers state variables not commonly used in bus/branch system modeling. A generalized state estimation model, in which switches and circuit breakers are rep
Publicado em: 2007
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10. Utilização de algoritmos genéticos em restauração de sistemas de potência
This work reports the development of an Artificial Intelligence system applied to Power Systems Restoration, with an hybrid approach. The system employs a Genetic Algorithm (GA) to generate sequences of operations which are analysed by a Power Flow program to verify and access their fitness. For this GA, a new genoma representation was developed, as well as
Publicado em: 2006
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11. Power system state estimation: computer program for analysis and updating of measurement set qualitative characteristics / Estimação de estado em sistemas elétricos de potência: programa para análise e atualização das características qualitativas de conjunto de medidas
To obtain a safe power system (PS) operation, becomes necessary a reliable state estimation (SE), since the real time control actions of a PS are based on the data obtained through the SE process. The first requirement for a successful SE process is the existence of a reliable measurement placement plan, that is, a measurement placement plan that guarantees
Publicado em: 2006
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12. Computational methodology to evaluate the quality of power systems restoration plans / Metodologia computacional para avaliação da qualidade de planos de recomposição de sistemas de energia eletrica
A successful restoration depends on the quality of the restoration plans, that describe the sequence of control actions that must be executed to reenergize different areas (of the power system) just after total or partial blackouts. This work proposes a methodology to automatically evalute the quality of power system restoration plans, related to (a) the fle
Publicado em: 2005