DEE - Departamento de Engenharia Elétrica
URI Permanente desta comunidadehttps://repositorio.ufrn.br/handle/1/129
Navegar
Navegando DEE - Departamento de Engenharia Elétrica por Título
Agora exibindo 1 - 5 de 5
- Resultados por página
- Opções de Ordenação
Artigo Application of multivariable control using artificial neural networks in a debutanizer distillation column(International Congress of Mechanical Engineering, 19, 2007-11-05) Lopes, José Soares Batista; Popoff, Luiz Henrique G.; Silva, Rodrigo Eduardo Ferreira da; Vale, Marcelo Roberto Bastos Guerra; Araújo, Fabio Meneghetti Ugulino de; Gabriel Filho, Oscar; Maitelli, André LaurindoArtigo Complex correntropy function: properties, and application to a channel equalization problem(Elsevier, 2018-10-01) Guimarães, João P. F.; Fontes, Aluisio I. R.; Rego, Joilson Batista de Almeida; Martins, Allan de Medeiros; Principe, J.C.The use of correntropy as a similarity measure has been increasing in dif ferent scenarios due to the well-known ability to extract high-order statistic information from data. Recently, a new similarity measure between complex random variables was defined and called complex correntropy. Based on a Gaussian kernel, it extends the benefits of correntropy to complex-valued data. However, its properties have not yet been formalized. This paper studies the properties of this new similarity measure and extends this defini tion to positive-definite kernels. Complex correntropy is applied to a channel equalization problem as good results are achieved when compared with other algorithms such as the complex least mean square (CLMS), complex recursive least squares (CRLS), and least absolute deviation (LAD)Artigo Quality function deployment and analytic hierarchy process: a literature review of their joint application(SAGE Publications, 2020-09-22) Oliveira, Leonardo Medeiros Vaz; Santos, Hugo Ferreira; Almeida, Mariana Rodrigues; Costa, José Alfredo FerreiraThe aim of this paper is to review the literature on the combined use of Quality Function Deployment (QFD) and Analytic Hierarchy Process (AHP) methodologies and to apply a comprehensive analysis over the resulting publications. The paper seeks to classify the articles with regard to their variations and extensions, and application areas. The articles are mostly applied in manufacturing, supply chain, higher education, strategy, service and sustainability. This review is characterized by a quantitative and qualitative approach of a non-probabilistic intentional sample composed of 100 academic papers – 98 articles and 2 reviews. For this purpose, the Scopus database was selected as a means to undertake a systematic investigation with a longitudinal cut from 1994 to 2015. The aim of this paper also contributes toward complementing Ho and Mehrjerdi revisions on deepening the QFD-AHP joint application. The limitation is related to the sample of works focus of this review, restricted to the Scopus database, thereby not characterizing the literature universe. A proposal for further investigations is to expand the search scope to other databases and to carry out a deeper analysis on each application area presentedArtigo A sliding-mode voltage regulator for salient pole synchronous generator(Elsevier, 2015-08-28) Ribeiro, Ricardo Lúcio de Araújo; Sousa Neto, Cecílio Martins de; Costa, Flávio Bezerra; Rocha, Thiago de Oliveira Alves; Barreto, Rodrigo LopesThis paper presents a sliding-mode control strategy for voltage regulation of synchronous generatorsconnected to the power grid that combines sliding mode and linear control laws. This hybrid controlscheme contributes preventing system instability, by suppressing the low-frequency oscillations arisingfrom power grid fault disturbances. In addition, this strategy does not require the estimation of systemparameters. This control strategy was designed to be introduced easily in a conventional automatic volt-age regulator (AVR) algorithm. Experimental results obtained with a laboratory test set-up, consisting ofthe synchronous generator connected to the grid and subjected to severe power transients, was employedto validate the proposed control approach. Comparisons with a conventional as well as with two hybridcontrol schemes demonstrate the advantages of the proposed control strategyArtigo Wavelet-fuzzy power quality diagnosis system with inference method based on overlap functions: case study in an AC microgrid(Elsevier, 2019-05-30) Nolasco, Diego H. S.; Costa, Flávio Bezerra; Palmeira, Eduardo Silva; Alves, Denis Keuton; Bedregal, Benjamín Rene Callejas; Rocha, Thiago de Oliveira Alves; Ribeiro, Ricardo Lúcio de Araújo; Silva, Juliano Costa Leal daThis work proposes a wavelet-fuzzy power quality (PQ) diagnosis method able to evaluate the PQ impact of steady-state (stationary) PQ events in alternating current (AC) microgrids considering the influence of the power level penetration. The proposed method is composed by a wavelet packet-based signal processing to compute the root mean square (RMS) and steady-state PQ indices of measured voltages and currents, providing accurate results even if transient disturbances take place. Thereafter, a cascade-type hierarchical fuzzy system receives the PQ indices and performs the power quality diagnosis to evaluate the impacts of disturbances on electrical system power quality. The proposed method considers subjectivities of several PQ standards simultaneously and applies an adaptive algorithm that allows the evaluation of the PQ diagnosis from the total harmonic distortion of currents considering different levels of power penetration of microgrids. Experimental results obtained from an ac microgrid laboratory setup evaluates the proposed PQ diagnosis method. In addition, the fuzzy system uses a new inference concept based on an extended n-dimensional overlap function