José Rubens Macedo Jr

José Rubens Macedo Jr
Universidade Federal de Uberlândia (UFU) | UFU · Faculty of Electrical Engineering (FEELT)

D.Sc.

About

53
Publications
25,737
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193
Citations
Citations since 2017
5 Research Items
123 Citations
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201720182019202020212022202305101520
201720182019202020212022202305101520
201720182019202020212022202305101520

Publications

Publications (53)
Article
This paper aims to develop a computational model of the Linear Current Control (LCC) filter in order to evaluate the performance of the different control strategies, commonly found in commercial single-phase grid-tie inverters, in terms of the compliance with the distribution utilities standards. The use of LCC filters requires some strategies to m...
Conference Paper
This paper presents a comparative evaluation of two commonly used active filter methods. In the first method the active filter performance is based on injection of harmonic currents 180o out of phase with the harmonics produced by the non-linear loads that must be compensated. Therefore, the compensated line current is equal the 50/60 Hz positive s...
Conference Paper
This paper presents a practical method for a real-time measurement of the ratio ρ = rneq / r (r = line resistance, rneq = equivalent neutral path resistance) of a three-phase four-wire distribution feeder and advocates the possibility of ignoring the zero-sequence voltage component due to its reduced magnitude in practical situations. The ratio ρ h...
Article
This study presents the preliminary results of a new methodology for detecting high-impedance faults in distribution systems based on interharmonic signatures. The methodology involves incorporation of an interharmonic current analysis system into a conventional protection system, such as automatic reclosers and sectionalisers. To check the functio...
Article
Full-text available
This study presents the development and implementation of an alternative Flickermeter based on a low cost embedded electronic system. The development of this new device is based on the original Flickermeter proposed by the IEC 61000-4-15, but with important modifications added. These modifications allow for direct quantification of light variation,...
Article
After the approval of the Normative Resolution 482, in April 17th, 2012, ANEEL has established the general conditions for microgeneration (less than or equal to 100 kW) and minigeration (greater than 100 kW and less than or equal to 1 MW), accessing the electric power distribution systems. In addition, it is established the net metering compensatio...
Article
Full-text available
Nowadays, the electric power supply to rural facilities is commonly composed by single-phase medium voltage grids. Eventually, some of these rural facilities require the use of more significant driving loads, making necessary the replacing of the single-phase networks by a new medium voltage three-phase network. Thus, despite the fact it is a new o...
Article
The main flicker source is the irregularly fluctuating loads, specially the AC electric arc furnace (EAF). The random time-varying and nonlinear behavior of the arc is quite difficult to model analytically. The most EAF models are not feasible for flicker planning studies, that is, industry accepted methods to predict voltage flicker levels have no...
Technical Report
Full-text available
O advento da eletrônica e dos microprocessadores tem causado grandes mudanças na área da saúde. Hoje em dia, os equipamentos médicos são menores e mais rápidos, em contrapartida, são mais suscetíveis a distúrbios elétricos se comparados aos que eram fabricados 20 anos atrás. Tais distúrbios podem ser provenientes da concessionária de energia que at...
Article
Full-text available
Resumo -Este artigo apresenta o desenvolvimento de um novo medidor de flicker baseado na análise direta da variação instantânea do fluxo luminoso. A proposta do medidor é baseada no Flickermeter IEC modificado, o que permite medir o flicker produzido por flutuação de tensão em lâmpadas de tecnologias distintas. Isso o torna uma alternativa ao Flick...
Article
Full-text available
Resumo - Este artigo apresenta o desenvolvimento de um novo medidor de flicker baseado na análise direta da variação instantânea do fluxo luminoso. A proposta do medidor é baseada no Flickermeter IEC modificado, o que permite medir o flicker produzido por flutuação de tensão em lâmpadas de tecnologias distintas. Isso o torna uma alternativa ao Flic...
Article
Full-text available
Currently, the supply of electricity to rural districts is realized, in almost all cases, through single-phase medium-voltage overhead distribution lines. However, some of these installations will eventually demand the use of more expressive electrical loads, which makes the use of three-phase distribution systems a necessity, thus bringing about t...
Article
Full-text available
Resumo  Este artigo apresenta resultados experimentais da análise dos efeitos da flutuação de tensão sobre diferentes tipos de lâmpadas. Foram submetidas aos testes básicos da norma IEC 61000-4-15 as lâmpadas residências de tecnologias comuns. A medição foi feita de forma direta a partir da cintilação, sendo usado um medidor baseado no modelo do F...
Article
Full-text available
Faced with the guidelines contained in documents approved by the National Electric Power Agency PRODIST - Module 8, among other indicators of electric power supply quality, the harmonic distortion emerges as an important issue. The mentioned regulation takes into account specific matters such as definitions, measurement procedures, benchmarks, etc....
Article
Full-text available
Until the beginning of the first decade of this century it was believed that the appearance of the phenomenon of voltage fluctuation, and eventually flicker, was necessarily related to the abrupt changes, repetitive or random, in reactive power required by some loads like, for example, electric arc furnaces and hot strip mills. Concomitantly, the I...
Article
Full-text available
This paper presents an overview about the new Brazilian Power Quality Standard and provides a low cost device PQ meter, developed and implemented to assist the national campaign to assess the Brazilian power quality indices, un-known until now. This work contributes with the search of a low cost devices PQ meter for a cost sensitive market, and int...
Conference Paper
Full-text available
Resumo A possibilidade de analisar a influência das operações dos processos de soldagem sobre a qualidade da energia elétrica (QEE) torna- Abstract: The possibility of analyzing the influence of GMAW process on the power quality (PQ) is an important source of information for electric utilities, for guaranteeing the quality of the supply, and users,...
Conference Paper
Considering the guidelines contained in documents such as the IEEE Standard 519 and IEC 61000-3-6 that includes, among other indexes of power quality, the thematic of the harmonic distortion, the mentioned text refers to issues associated with definitions, measuring procedures, reference values, etc. Taking under consideration these determinations,...
Conference Paper
Full-text available
Resumo Não havia regulamentação na a área de Qualidade da Energia Elétrica no Brasil, porém, finalmente a área recebeu uma norma. Este artigo apresenta uma visão geral sobre a Norma e o desenvolvimento de um medidor de baixo custo, apto a monitorar os principais indicadores de qualidade do forneci-mento da tensão. Devido às enormes dimensões e comp...
Conference Paper
Full-text available
trabalho trata da análise da qualidade da energia elétrica, abordando particularmente os efeitos dos fenômenos relacionados com a flutuação de tensão e com a geração de componentes inter-harmônicas em processos de soldagem tipo MIG (Metal Inert Gas) pulsado. As frequências de soldagem do processo MIG pulsado são determinadas pela variação de parâme...
Conference Paper
Full-text available
trabalho trata da análise de qualidade da energia elétrica abordando os efeitos flicker e as inter-harmônicas geradas, considerando vários modos de transferência em um processo de soldagem MIG/MAG. Os diferentes modos de transferência são classificados em: curto-circuito, globular e goticular. A correta escolha dos parâmetros do processo é essencia...
Article
This paper presents harmonic distortion measurements in several countries taken during live televised matches of the 2010 Soccer World Cup held in South Africa. The paper provides an analysis of the components involved in the increase of total harmonic distortion of current and voltage. The work also compares the latest measurements with previous e...
Article
Full-text available
This work deals with a step-by-step modeling and implementation of IEC flickermeter. The developed Matlab-Simulink flickermeter model could be considered an important tool to several power quality analyses related to voltage fluctuations. In addition, this work proposes a different way to implementation of flickermeter's block 5, which one is respo...
Article
Full-text available
This paper discusses the development and implementation of a digital power quality meter to comply with the new standard which will regulate the Power Quality in Brazil. Its main objective has been to become a low cost device capable of monitoring the main Power Quality indices of the new standard, such as the steady state RMS voltage, harmonic dis...
Conference Paper
Full-text available
This work is about a developed and implemented power quality digital meter to comply with the new Brazilian standard to regulate the Power Quality in Brazil. The objective of this work has been to develop a low cost device able to monitor the main indices of standard such as the steady state rms voltage, harmonic distortion, fluctuation voltage, un...
Conference Paper
Full-text available
This work deals with the development of a digital power quality meter to comply with the new standard which regulates the Power Quality requirements in Brazil. The purpose was to develop a low cost device able to monitor the main standard indices such as the steady state RMS voltage, harmonic distortion, voltage fluctuation, voltage unbalance, volt...
Article
Full-text available
This paper discusses the development and implementation of a digital power quality meter to comply with the new standard which will regulate the Power Quality in Brazil. Its main objective has been to become a low cost device capable of monitoring the main Power Quality indices of the new standard, such as the steady state RMS voltage, harmonic dis...
Article
Full-text available
O objetivo do presente trabalho é apresentar a modelagem e a implementação de um flickermeter, baseado no protocolo IEC 61000-4-15[1], no ambiente computacional Matlab-Simulink ® . O referido modelo constitui uma ferramenta de grande utilidade nas simulações e estudos associados com a qualidade da energia elétrica, notadamente relacionados com o fe...
Article
Full-text available
A segunda parte do presente trabalho apresenta a modelagem do bloco de análise estatística da Sensação Instantânea de Flicker (bloco 5), assim como os resultados dos testes de calibração realizados no modelo de flickermeter desenvolvido. Toda a modelagem apresentada para o flickemeter IEC foi baseada no protocolo IEC 61.000-4-15 [1].
Conference Paper
This paper presents the design, construction and performance of an application of shunt tuned passive filters in the medium-voltage side of a distribution system. The results found are encouraging to solve eventual parallel resonances problems detected in this kind of distribution feeder.
Conference Paper
Full-text available
The goal of this paper is to present the results and analysis related to the impact of the FIFA world cup 2006 TV broadcast, during the National Brazilian soccer team games, on the power quality in the electric distribution systems, mainly in the current and voltage harmonic frequencies. This way, a metering campaign of power quality indexes was im...
Conference Paper
Nowadays, the use of modern electronic equipment in residential houses connected to the low-voltage distribution circuits have brought some adverse effects such as overheated transformers, high voltage distortion and low power factor within low voltage customers.
Conference Paper
This paper presents the design, construction and testing of an application of shunt passive tuned filters in the low-voltage side of 13.8/0.22 kV distribution system transformers. The main contribution of this paper is to presents an analysis of unusual application of shunt harmonic filter. This approach could relieve the transformer and also, impr...
Conference Paper
This paper presents the design, construction and testing of an application of shunt passive tuned filters in the low-voltage side of 13.8/0.22 kV distribution system transformers.
Conference Paper
This paper introduces a probabilistic modeling for harmonic analysis of low voltage consumers. The modeling was developed based upon measurements that were carried out by a Brazilian electrical energy power supply company.
Conference Paper
This work presents an analysis of the inherent structure theory of networks (ISTN) as a tool to detect the sensibility of a power system for some power quality problems, such as optimum placement of harmonic filters or capacitor banks. The main contribution is in the introduction of the sparsity factor of the corresponding power system admittance m...
Conference Paper
This paper presents a general three-phase model for wye/delta-extended transformers for time-domain analysis. Among other features, the modeling includes the nonlinearities of the core and the transformer phase-shifting can be of any value. The model is implemented in the SABER simulator and tested in a 24-pulse converter. The corresponding results...
Article
Full-text available
O artigo apresenta um estudo sobre formas de correção de nível de tensão na distribuição secundária, com a seleção de uma estrutura para implementação. Para a topologia selecionada, estudam-se os requisitos de implementação, técnicas de controle e aspectos de implementação. A solução é explorada por simulação em ambiente Matlab/Simulink, para verif...

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