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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

Sistemas de conversão estatística aplicados em equipamentos com terminais a enrolamentos abertos ou em estrela.

CARLOS, Gregory Arthur de Almeida. 02 May 2018 (has links)
Submitted by Jesiel Ferreira Gomes (jesielgomes@ufcg.edu.br) on 2018-05-02T23:31:51Z No. of bitstreams: 1 GREGORY ARTHUR DE ALMEIDA CARLOS – TESE (PPGEE) 2016.pdf: 26196429 bytes, checksum: b0f539b04f91868561f613e31cebcc23 (MD5) / Made available in DSpace on 2018-05-02T23:31:51Z (GMT). No. of bitstreams: 1 GREGORY ARTHUR DE ALMEIDA CARLOS – TESE (PPGEE) 2016.pdf: 26196429 bytes, checksum: b0f539b04f91868561f613e31cebcc23 (MD5) Previous issue date: 2016-05-25 / Capes / Neste documento, s~ao propostas topologias de conversores que utilizam estruturas trifásicas, a três ou quatro fi os, alimentando equipamentos (motores ou transformadores) com terminais dispostos a enrolamentos abertos ou com conexão em estrela (Y ). Dentre os equipamentos mencionados tem-se: i) restaurador dinâmico de tensão (DVR), ii) ltro ativo de potência (APF) paralelo, iii) fi ltro ativo de potência (APF) série, iv) sistema de acionamento CA-CC-CA série/paralelo e v) sistema baseados em conversores com braços de dois e três-níveis. Para cada topologia estudada, são abordados os seguintes pontos: modelagem da con figuração, estratégias PWM, estratégia de controle. Também é realizado um estudo comparativo entre as topologias propostas e algumas convencionais, avaliando seus desempenhos atrav es de algumas guras de m erito as quais englobam distorções harmônicas das tensões e correntes, estimativa de perdas nos conversores e níveis de tensão no barramento CC. Resultados de simulação e experimentais são apresentados para fins de validação. / This document reports studies on converter topologies applied in three-phase, four-wire or three-wire, systems feeding open-end winding (OEW) equipment or Wye-connected equipment. Such equipment are considered in this work as induction motors or transformers. The devices associated with these equipment are: i) dynamic voltage restorer (DVR), ii) Shunt Active Power Filter (Shunt-APF), iii) Series Active Power Filter (Series-FAP), iv) AC-DCAC series/parallel motor drive, v) Systems with converters based on two- and three-level leg connections. Each studied topology presents its con guration model, PWM strategy, control strategy. Comparative studies considering proposed and some conventional topologies are presented highlighting the harmonic distortion for the voltages and currents, semiconductor losses estimation, dc-link voltage ratings, etc. Simulation and Experimental results are presented for validation purposes. Keywords: Dynamic voltage restorer, shunt active power lter, series active power lter, ac-dc-ac motor drive system, series-connected conveters, parallel-connected converters, converters based on two- and three-level leg connections.

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