Power Systems Stability And Control
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. An Extended Kalman Filter-Based Technique for On-Line Identification of Unmanned Aerial System Parameters
ABSTRACT: The present article deals with the identification, at the same time, of aircraft stability and control parameters taking into account dynamic damping derivatives. Such derivatives, due to the rate of change of the angle of attack, are usually neglected. So the damping characteristics of aircraft dynamics are attributed only on pitch rate derivative
J. Aerosp. Technol. Manag.. Publicado em: 2015-09
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2. Uma contribuição à alocação de geração distribuída, a inserção de PCHs com máquinas síncronas nos sistemas rurais de média tensão
The present work is about an analysis in the domain of distributed generation (DG) allocation in rural distribution systems; the study takes into account the synchronous machines. In such a way, it was possible to research several impacts caused by DG in distribution systems, such as: the rotor angle stability problem under small disturbances; increase of vo
Publicado em: 2009
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3. AVALIAÇÃO E REFORÇO DAS CONDIÇÕES DE ESTABILIDADE DE TENSÃO EM BARRAS DE TENSÃO CONTROLADA POR GERADORES E COMPENSADORES SÍNCRONOS / VOLTAGE STABILITY ASSESSMENT AND ENHANCEMENT IN VOLTAGE-CONTROLLED BUSES BY SYNCHRONOUS GENERATORS AND COMPENSATORS
After the incidence of some voltage collapses in the energy transmission systems in the world, the voltage security became an issue of great interest in the last years due to the importance of its impact. The phenomenon of voltage stability is due to the excessive active and reactive power flow in the electrical transmission network and has been associated w
Publicado em: 2009
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4. Estabilização de oscilações de potencia de linhas de intercambio atraves de um elo de corrente continua / Stabilization of power lines interchange oscillations through a direct-current link
When an interconnected alternate-current power system suffers variations of loads, its frequency can exhibit an oscillatory behavior. If this system possesses a direct-current link in parallel with the inter-tie lines, this effect could be decreased, due to the link current controller action. This work presents a study that evaluates the efficiency of DC lin
Publicado em: 2009
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5. IEC-61850: interoperability and interchangeability between supervision, control and protection equipment using data communication networks / IEC-61850: interoperabilidade e intercambialidade entre equipamentos de supervisão, controle e proteção através das redes de comunicação de dados
Data communication has always been considered as a critical factor in real time operation of electric power systems. This is due to the need for fast and accurate decisions at different locations, from power generation to the user interfaces. With the digital technology, measurement, signals and commands are encrypted into data packets that travels on the su
Publicado em: 2009
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6. Controle robusto de sistemas de potência multimáquinas através de desigualdades matriciais lineares: abordagem por alocação de pólos e ajuste de estabilizadores de sistemas de potência. / Robust control of multimachine power systems through linear matrix inequalities: the pole placement approach with power system stabilizers adjustment.
The aim of this work is to elaborate robust control algorithms to power systems. The mathematical model employed to describe the multimachine power system is that used in small signal studies, and the main goal is to increase the damping of the critical eigenvalues of the system, guaranteeing its stability and performance in various operating conditions. To
Publicado em: 2008
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7. Computation of voltage stability margins of power systems / Obtenção da margem minima de estabilidade de tensão de sistemas eletricos de potencia
This work presents a new and fast method for computing the minimum voltage stability margin of electric power systems. The computation of the voltage stability margin (VSM) is often required for the planning and operation of power systems. Usually, loads are increased along a predefined direction, which can be estimated based on historical data or load forec
Publicado em: 2007
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8. COMPARATIVE ANALYSIS BETWEEN THE MAXIMIZATION OF VOLTAGE STABILITY MARGIN AND LOSS REDUCTION IN DISTRIBUTION SYSTEMS / ANÁLISE COMPARATIVA ENTRE A MAXIMIZAÇÃO DA MARGEM DE POTÊNCIA E MINIMIZAÇÃO DAS PERDAS TÉCNICAS EM SISTEMAS DE DISTRIBUIÇÃO DE ENERGIA ELÉTRICA
The increase of the consumption of electric energy takes the distribution systems to operate next to its limits, which might cause situation of maximum active and reactive power flow in the branches, that is, problems of voltage stability. The change of the topology of the network allows to find a configuration where de voltage stability indexes are far from
Publicado em: 2007
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9. CONTRIBUTIONS TO STUDY OF WIND FARM CONNECTION TO THE UTILITY / CONTRIBUIÇÕES AO ESTUDO DE CONEXÃO DE GERAÇÃO EÓLICA À REDE ELÉTRICA
Distribution systems have not been designed to receive distributed generation (DG) units. The electric energy injection in these systems is safe and reliable if the characteristics regarding of DG interconnection in distribution power systems are considered: (i) Protection; (ii) Stability; (iii) Electric energy market; (iv) Quality of energy. In this work, a
Publicado em: 2007
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10. TRACTION CONTROL TO MOBILE ROBOTIC SYSTEMS IN ROUGH TERRAIN / MODELAGEM DE SISTEMAS ROBÓTICOS MÓVEIS PARA CONTROLE DE TRAÇÃO EM TERRENOS ACIDENTADOS
Abstract Silva, Alexandre F. Barral Silva; Meggiolaro, Marco Antonio. Traction Control to Mobile Robotic Systems in Rough Terrain. Rio de Janeiro, 2004. 194 p. MSc. Thesis - Departamento de Engenharia Mecânica, Pontifícia Universidade Católica do Rio de Janeiro. In rough terrain it is critical for mobile robots to maintain adequate wheel traction, because
Publicado em: 2007
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11. VOLTAGE CONTROL SENSITIVITY CALCULATION FOR VOLTAGE STABILITY OPERATIONAL REINFORCEMENT / ADEQUAÇÃO DAS AÇÕES DE CONTROLE DE TENSÃO EM SISTEMAS ELÉTRICOS OBJETIVANDO O REFORÇO DAS CONDIÇÕES DE SEGURANÇA DE TENSÃO
The voltage stability problem has been associated with environment questions and lack of financial resources for transmission system expansion. This reality together with the load growth makes the electrical system to be subject of heavy loadings, what can lead to situations of voltage collapse. The development of methods for evaluation of transmission netwo
Publicado em: 2007
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12. Sintese de indutancia negativa para aplicação serie em redes de energia eletrica / Negative inductance synthesis for series applications on the electrical network
Nesta tese é introduzida uma nova estratégia de controle que permite a síntese de indutâncias negativas para realização da compensação série de linhas de transmissão. O método, que é baseado na estratégia SDR (Síntese Direta de Reatâncias), opera com realimentação de estados e requer a medição de variáveis locais. Em relação aos método
Publicado em: 2007