CT - DEE - Artigos publicados em periódicos

URI Permanente para esta coleçãohttps://repositorio.ufrn.br/handle/1/172

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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 Lopes
This 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 strategy
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 da
This 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

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