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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estimação de fasores na presença de harmônicos, decaimentos CC exponencial e inter-harmônicos exponencialmente amortecidos

Vianello, Rodrigo 24 February 2010 (has links)
Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-12-22T11:06:45Z No. of bitstreams: 1 rodrigovianello.pdf: 847018 bytes, checksum: 7ad17011832e8156b0fa361091a1375a (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-12-22T12:53:13Z (GMT) No. of bitstreams: 1 rodrigovianello.pdf: 847018 bytes, checksum: 7ad17011832e8156b0fa361091a1375a (MD5) / Made available in DSpace on 2016-12-22T12:53:13Z (GMT). No. of bitstreams: 1 rodrigovianello.pdf: 847018 bytes, checksum: 7ad17011832e8156b0fa361091a1375a (MD5) Previous issue date: 2010-02-24 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / O presente trabalho apresenta a proposição de duas metodologias inovadoras no campo da estimação fasorial. A primeira delas propõe a estimação do fasor da componente fundamental na presença de harmônicos e decaimento CC exponencial e é baseada na aplicação de filtros DFT (Discrete Fourier Transform) e de alguns métodos de processamento de sinais, tais como janelamento, modulação e DTFT (Discrete Time Fourier Transform). A segunda metodologia também propõe a estimação do fasor da componente fundamental, mas em um cenário mais complexo onde estão presentes no sinal, além dos harmônicos e decaimento CC exponencial, as oscilações subsíncronas. Esta metodologia é baseada na aplicação de redes neurais artificiais e de alguns métodos de processamento de sinais. Ambas as metodologias foram avaliadas frente a métodos tradicionais de estimação fasorial e apresentaram desempenhos superiores na presença de ruídos. / Thisthesispresents thepropositionoftwonovelmethodsin thefieldofphasor estimation. The first proposes to estimate the phasor of the fundamental component in the presence of harmonicsandexponentialdecayingDC.ThismethodologyisbasedontheapplicationoffiltersDFT (Discrete Fourier Transform) and some methods of signal processing such as windowing, modulation and DTFT (Discrete Time Fourier Transform). The second approach also proposes to estimate the phasor of the fundamental component, but in a more complex scenario formed for harmonics, exponential decaying DC and the sub-synchronous oscillations . This methodology isbasedontheapplicationofartificialneuralnetworksandsomemethodsofsignalprocessing. Both methods were evaluated against traditional methods of phasor estimation and the simulations showed that the two proposed methods were more accurate then others in presence of noise.

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