Uso da Transformada Wavelet e Rede Neural Regressiva Generalizada (GRNN) para a Caracterização de Variações de Tensão de Curta Duração em Sistemas Elétricos de Potência (Use of Wavelet Transform and Generalized Regression Neural Network (GRNN) to the Characterization of Short-Duration Voltage Variation in Electric Power System.)

Raimundo Nonato das Merces Machado (nonatomac@ig.com.br)1, Ubiratan Holanda Bezerra (bira@ufpa.br)2, Evaldo Gonçalves Pelaes (pelaes@ufpa.br)2, Roberto Celio Limão de Oliveira (limao@ufpa.br)2, Maria Emilia de Lima Tostes (tostes@ufpa.br)2


1Centro Federal de Educação Tecnologica do Pará
2Universidade Federal do Pará

This paper appears in: Revista IEEE América Latina

Publication Date: June 2009
Volume: 7,   Issue: 2 
ISSN: 1548-0992


Abstract:
This work presents the use of the wavelet transform and computational intelligence techniques to quantify voltage short-duration variation in electric power systems, with respect to time duration and magnitude. The wavelet transform is used to determine the event duration, as well as for obtaining a characteristic curve relating the signal norm as function of the number of cycles for a waveform without disturbance that is used as reference for the calculation of the magnitude of the event. A Generalized Regression Neural Network (GRNN) is used to interpolate not stored points of the characteristic curve. The method is part of a process to automate the post operation signal analysis in electric power systems, and it is used to quantify the voltage short-duration variation magnitude of previously selected signals. The method has been shown efficient, and some results obtained from the application of this method to power system real signals are presented.

Index Terms:
power quality, generalized regression neural network, wavelet transform.   


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