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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

Metodologia de estima??o de estados para tratamento de medi??es err?neas e registros n?o sincronizados em algoritmos de localiza??o de faltas em linhas de transmiss?o

Cruz, Melinda Cesianara Silva da 17 July 2015 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-04-22T21:41:53Z No. of bitstreams: 1 MelindaCesianaraSilvaDaCruz_TESE.pdf: 2034495 bytes, checksum: a7bdc7bc74326370650126bf74a096da (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-04-22T22:11:02Z (GMT) No. of bitstreams: 1 MelindaCesianaraSilvaDaCruz_TESE.pdf: 2034495 bytes, checksum: a7bdc7bc74326370650126bf74a096da (MD5) / Made available in DSpace on 2016-04-22T22:11:02Z (GMT). No. of bitstreams: 1 MelindaCesianaraSilvaDaCruz_TESE.pdf: 2034495 bytes, checksum: a7bdc7bc74326370650126bf74a096da (MD5) Previous issue date: 2015-07-17 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O desempenho de algoritmos para localiza??o de faltas em linhas de transmiss?o est? diretamente relacionado ? exatid?o dos seus dados de entrada. Assim, fatores como erros nos par?metros da linha de transmiss?o, falhas na sincroniza??o de registros oscilogr?ficos e erros em medi??es de tens?o e de corrente podem influenciar de forma significativa as ferramentas que usam dados err?neos para indicar o local de defeitos. Este trabalho apresenta uma nova metodologia para localiza??o de faltas em linhas de transmiss?o, baseada na teoria de estima??o de estados, de forma a determinar o local mais prov?vel de ocorr?ncia de curtos-circuitos atrav?s da considera??o de erros sistem?ticos real?sticos que podem estar presentes nas medi??es de tens?o e de corrente. O algoritmo foi implementado em duas etapas: pr?-falta e p?s-falta. Na primeira etapa, admitindo dados n?o sincronizados, estima-se o ?ngulo de sincroniza??o e os par?metros de sequ?ncia positiva da linha de transmiss?o, e na segunda, estima-se a dist?ncia de falta. Al?m de calcular o valor mais prov?vel para a dist?ncia de falta, a partir da considera??o de erros nas medi??es, a vari?ncia associada a esta dist?ncia tamb?m ? determinada, usando defini??es da teoria de erros. Essa ? uma das principais contribui??es deste trabalho, visto que, a partir o algoritmo proposto, ? poss?vel determinar uma regi?o de prov?vel incid?ncia da falta, com aproximadamente 95,45% de confian?a. Testes para avalia??o e valida??o da metodologia foram realizados a partir de registros reais de falta e a partir de simula??es de sistemas fict?cios de transmiss?o no software ATP. Os resultados obtidos s?o relevantes para mostrar que o estimador de localiza??o de faltas desenvolvido apresenta bom desempenho mesmo adotando vari?ncias real?sticas. / The performance of algorithms for fault location i n transmission lines is directly related to the accuracy of its input data. Thus, fa ctors such as errors in the line parameters, failures in synchronization of oscillographic recor ds and errors in measurements of voltage and current can significantly influence the accurac y of algorithms that use bad data to indicate the fault location. This work presents a new method ology for fault location in transmission lines based on the theory of state estimation in or der to determine the location of faults more accurately by considering realistic systematic erro rs that may be present in measurements of voltage and current. The methodology was implemente d in two stages: pre-fault and post- fault. In the first step, assuming non-synchronized data, the synchronization angle and positive sequence line parameters are estimated, an d in the second, the fault distance is estimated. Besides calculating the most likely faul t distance obtained from measurement errors, the variance associated with the distance f ound is also determined, using the errors theory. This is one of the main contributions of th is work, since, with the proposed algorithm, it is possible to determine a most likely zone of f ault incidence, with approximately 95,45% of confidence. Tests for evaluation and validation of the proposed algorithm were realized from actual records of faults and from simulations of fictitious transmission systems using ATP software. The obtained results are relevant to show that the proposed estimation approach works even adopting realistic variances, c ompatible with real equipments errors.

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