sinopseV3n3.pdf - FEEC - Unicamp

years, however, more and more utilities started to question this
practice as the loads in current systems have become very
sensitive to momentary interruptions. Auto-reclosing can create
momentary interruptions to a large number of customers,
yielding bad power quality consequences. As a result, some
utilities are trying to eliminate the auto-reclosing practice.
However, eliminating the practice implies a fundamental
change in planning and operating a power distribution system.
It seems that one cannot achieve simultaneous improvement on
both power reliability and power quality using auto-reclosing.
In view of the far-reaching impact of this issue, this work
conducts a survey as a starting point to prepare industry to deal
with the issue in a proactive and strategic manner.
Keywords: Power quality, reliability, distribution
systems, reclosers, overcurrent protection.
Análise da necessidade de alteração dos ajustes
dos relés de sobrecorrente de instalações
industriais com geradores síncronos após a
ocorrência de ilhamento
F. Trindade, Madson Cortes De Almeida, Walmir De Freitas
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:2441-2446
Abstract: With the advance of digital relays, adaptive
protection schemes have become reality. This type of protection
schemes can be useful in industrial systems with synchronous
generators that operate in both modes: parallel and isolated
(islanded). In this context, it is important to select the relays
that must have their settings automatically changed based on
the system operation condition. This work presents a simple
classification approach to select the relays to be used in the
adaptive scheme. Indeed, the approach selects the branches
protected by overcurrent protection whose relays must be
adaptively set. This classification is based on short-circuit
studies. This scheme improves the selectivity and coordination
of overcurrent protection schemes since it is not necessary to
find a solution to meet both parallel and islanded operation. The
proposed approach is successful applied to a real Brazilian
industrial plant with three cogeneration units.
Keywords: Distributed Generation, Industrial Plants,
Adaptive Protection Scheme, Synchronous Generator.
Análise de redes de distribuição trifásicas com
incertezas representadas por conjuntos
nebulosos
Patrícia L. Cavalcante, Carlos Alberto Favarin Murari, Silvio
S. Segura
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:2016-2023
Abstract: The research and development of electric and
mathematical models for the components of the electric
networks and for the loads contribute for the computer
simulation of the electric power systems that it happens in the
smallest time and results in compatible values with the reality.
This is the subject of this research that we describe in this
article, where the main objective was the development of a
three-phase load flow for the analysis of electric power
distribution networks with some variables that are not
deterministic, particularly the loads. In this sense, the imprecise
variables were represented as fuzzy numbers (in the bell form)
and it is presented a Specialized Three-Phase Load Flow that
incorporates fuzzy sets and respective mathematical operations.
The obtained results confirm the good performance of this new
method.
Keywords: Three-phase power flow, uncertainties, fuzzy
numbers
Aplicação do controlador ipfc para o
amortecimento de oscilações eletromecânicas
em sistemas de potência
Danilo B. do Valle, Igor Kopcak, Vivaldo F. da Costa
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:3383-3390
Abstract: This paper evaluates the effectiveness of the
Interline Power Flow Controller (IPFC) for improving smallsignal
stability of electric power systems. The IPFC power
injection model and its differential equations are included in the
power flow. The dynamic analysis is performed using the
power sensitivity model. Simulations in a two area test system
show that the IPFC equipped with a POD can provide the
damping of the critical oscillation modes, improving the system
dynamic performance, in addition to the flexibility to control
the transmission lines power flows.
Keywords: FACTS, IPFC, POD, Power Systems, Smallsignal
Stability
Conteúdo Harmônico da Corrente e Tensão de
Arcos Elétricos Gerados Artificialmente em
Ambiente Não Confinado
Maria Cristina Dias Tavares, Jonas Lemos Talaisys, Carlos
Medeiro Portela, Alessandra Benevides Camara
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:1185-1192
Abstract: In this paper the harmonic content of current and
voltage between terminals of 543 electrical arcs artificially
generated were obtained by applying the Windowed Fourier
Transform. This application is based on shifting a window on
the signs in study and calculating the coefficients of the
Discrete Fourier Transform, allowing a time-frequency analysis
of signals. A statistical analysis of the results has permitted the
identification of a harmonic signature of electrical arc.
Keywords: Secondary arc, harmonic analysis, singlephase
autoreclosing, non-permanent faults
Enhancement of Data Rate for User Cooperation
Mitchell Omar Calderon Inga, Gustavo Fraidenraich
In: IEEE/SBrT International Telecommunications Symposium
ITS 2010-Rafael Dueire Lins(Ed.) - ISBN: 978-85-89748-05-6
Manaus(AM) Brasil Sep-2010 pp:1 - 6
Abstract: In this paper, we propose a different scheme based
on user cooperation diversity, in which we obtain an increase in
the data rate. In particular, we present performance analysis
using conventional CDMA (code division multiple access)
implementation for two users. Cooperation among users has
been shown to achieve significant gains as compared to a noncooperative
system. The results presented here show that the
new scheme of cooperation achieves substantial increase of
data rate, keeping the average bit error probability close to
values obtained in [3]. Regarding the number of spreading
codes, there are costs associated with our cooperative scheme,
but even so our proposed strategy leads not only to an increase
in throughput but also to a simpler system.
Keywords: user cooperation, virtual MIMO, bit error
probability.
Estratégia de Controle e Análise do Filtro
Híbrido Utilizando um Inversor de Potência
Reduzida
Newton Soares Da Silva, Jose Antenor Pomilio, Edson Adriano
Vendrusculo
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:867-872
78 Sinopse da FEEC