Hopf Bifurcations
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Metodologia de avaliação de margem de estabilidade devido a bifurcações em sistemas elétricos de potência / Assessment methodology due to margin stability bifurcations in electric power systems
A complexidade da avaliação de segurança em sistemas de potência vem se tornando elevada, principalmente devido ao aumento por demanda de energia elétrica. Diariamente são inseridas cargas de forma sucessiva nos sistemas elétricos, podendo este fato conduzir o sistema ao colapso, caso não haja um planejamento adequado que evite tal ocorrência. Visan
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/03/2012
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2. Método rápido para avaliação da margem de estabilidade de tensão devido a bifurcação de Hopf / Rapid method for evaluating the margin of voltage stability due to Hopf bifurcation
Despite the increasing development of Hopf bifurcations detection methods for electric power systems in the last decades, some aspects still require to progress, especially with the increasing necessity for higher safety in the electrical energy systems operation. One of these aspects concerns to the processing time of these methodologies to be used in real-
Publicado em: 2009
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3. Bifurcation analysis of the Watt governor system
This paper pursues the study carried out by the authors in Stability and Hopf bifurcation in the Watt governor system [14], focusing on the codimension one Hopf bifurcations in the centrifugal Watt governor differential system, as presented in Pontryagin's book Ordinary Differential Equations, [13]. Here are studied the codimension two and three Hopf bifurca
Computational & Applied Mathematics. Publicado em: 2007
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4. Aplicação do transformador defasador para o amortecimento de oscilações eletromecanicas de baixa frequencia em sistemas de energia eletrica / Application of the shifting transformer for damping power systems low-frequency electromechanical oscillations
This dissertation presents an assessment of the performance of PST (Phase Shifting Transformer) equipped with a supplemental controller for damping power systems low-frequency electromechanical oscillations. The dynamic model that represents the PST is implemented in the Power Sensitivity Model (PSM). The stability analysis and the design of POD (Power Oscil
Publicado em: 2007
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5. A influencia de controladores FACTS na estabilidade de angulo a pequenas pertubações de sistemas eletricos de potencia
This master s dissertation presents an assessment of Flexible AC Transmission Systems (FACTS) controllers performance on power system small-signal angle stability improvement. The potential of the Power Sensitivity Model (PSM), an alternative approach to the classical Heffron-Phillips model (HPM) for study and analysis of poorly damped low frequency electrom
Publicado em: 2005
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6. Bifurcações elementares em sistemas reversiveis
In this dissertation singularities of certain classes of vector fields in lRn are studied. The main goal is to study the behavior of the local dynamics around degenerate singularities. Normal forms, unfoldings and interactions between certain elementary bifurcations (saddle-node, transcritical, pitchfork and histeresis) and Hopf bifurcation are presented. Po
Publicado em: 2003
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7. Sistemas impulsivos com retardamento: soluções periódicas. / Periodic solutions of an impulsive differential system with delay: an Lp approach.
We prove the existence of periodic solutions of some retarded functional differential equations subjected to impulsive self-supporting conditions. Due to the impulses, solutions exhibit discontinuites of the first kind and this forces the consideration of more general phase spaces than C([-r,0],Rn). We show that periodic solutions can emanate from the origin
Publicado em: 2000
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8. Existência e bifurcações de soluções periódicas da equação de Wright. / Existence and bifurcations of periodic solutions of the Wright s equations.
This work is concerned with periodicity in the Wright s equation. We prove the existence of nonconstant periodic solutions by exploiting the ejectivity concept in a theorem of fixed point. Furthemore, we prove the existence of an infinite sequence of Hopf Bifurcations.
Publicado em: 1999
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9. Stable cycling in discrete-time genetic models.
Examples of stable cycling are discussed for two-locus, two-allele, deterministic, discrete-time models with constant fitnesses. The cases that cycle were found by using numerical techniques to search for stable Hopf bifurcations. One consequence of the results is that apparent cases of directional selection may be due to stable cycling.
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10. A model for amplification of hair-bundle motion by cyclical binding of Ca2+ to mechanoelectrical-transduction channels
Amplification of auditory stimuli by hair cells augments the sensitivity of the vertebrate inner ear. Cell-body contractions of outer hair cells are thought to mediate amplification in the mammalian cochlea. In vertebrates that lack these cells, and perhaps in mammals as well, active movements of hair bundles may underlie amplification. We have evaluated a m
The National Academy of Sciences.