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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

Implementa??o experimental de filtro ativo paralelo de pot?ncia com aplica??o a gerador de indu??o trif?sico

Silva, Paulo Vitor 28 June 2010 (has links)
Made available in DSpace on 2014-12-17T14:55:44Z (GMT). No. of bitstreams: 1 PauloVS_DISSERT.pdf: 1338370 bytes, checksum: 7f4728ef2faffa30200a5b0daf963f20 (MD5) Previous issue date: 2010-06-28 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This work describes the experimental implementation of a shunt active power filter applied to a three-phase induction generator. The control strategy of active filter turned to the excitation control of the machine and to decrease the harmonics in the generator output current. Involved the implementation of a digital PWM switching, and was made a comparison of two techniques for obtaining the reference currents. The first technique is based on the synchronous dq reference method and the second on the theory of instantaneous power. The comparison is performed via simulation and experimental results. To obtain the experimental results, was mounted a bench trial and the control and communications needed were implemented using DSP - MS320F2812. The simulation results and experimental data proved the efficiency of the filter to apply, highlighting the technique of instantaneous power / Este trabalho descreve a implementa??o experimental de um filtro ativo paralelo de pot?ncia aplicado a um gerador de indu??o trif?sico. A estrat?gia de controle do filtro ativo voltou-se para o controle de excita??o da m?quina e para a minimiza??o dos harm?nicos na corrente de sa?da do gerador. Envolveu a implementa??o de um chaveamento PWM digital, tendo sido realizada a compara??o de duas t?cnicas para obten??o das correntes de refer?ncia. A primeira t?cnica se baseia no m?todo referencial s?ncrono dq e a segunda na teoria das pot?ncias instant?neas. A compara??o ? realizada via simula??o e resultados experimentais. Para obten??o dos resultados experimentais, foi montada uma bancada experimental e o controle e comunica??es necess?rias foram implementados utilizando-se um DSP - TMS320F2812. Os resultados de simula??o e experimentais obtidos comprovaram a efici?ncia do filtro para a aplica??o, com destaque para a t?cnica das pot?ncias instant?neas
2

Controlador adaptativo por posicionamento de p?los e estrutura vari?vel aplicado ao controle de geradores e?licos baseados em m?quina de indu??o duplamente alimentada

Honda, Daniel Wanderley 13 September 2013 (has links)
Made available in DSpace on 2014-12-17T14:56:15Z (GMT). No. of bitstreams: 1 DanielWH_DISSERT.pdf: 3818359 bytes, checksum: ac34198b688307ffda10243b5ad47c74 (MD5) Previous issue date: 2013-09-13 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / In the last decade, the renewable energy sources have present a major propulsion in the world due to several factors: political, environmental, financial and others. Within this context, we have in particular the energy obtained through wind, wind energy - that has highlighted with rapid growth in recent years, including in Brazil, mostly in the Northeast, due to it s benefit-cost between the clean energies. In this context, we propose to compare the variable structure adaptive pole placement control (VS-APPC) with a traditional control technique proportional integral controller (PI), applied to set the control of machine side in a conversion system using a wind generator based on Double-Fed Induction Generator (DFIG). Robustness and performance tests were carried out to the uncertainties of the internal parameters of the machine and variations of speed reference. / As fontes de energia renov?veis t?m, na ?ltima d?cada, ganho uma grande propuls?o em todo o mundo devido aos mais diversos fatores: pol?ticos, ambientais, financeiros, entre outros. Dentro deste universo, temos, em especial, a energia obtida atrav?s do vento, energia e?lica - que tem se destacado com um crescimento vertiginoso nos ?ltimos anos, inclusive no Brasil, principalmente na regi?o Nordeste, devido ao seu custo-benef?cio entre as energias "limpas". Neste cen?rio, prop?e-se a compara??o do controlador por posicionamento de polos e estrutura vari?vel (VS-APPC) com o controlador proporcional integral (PI) aplicados em um sistema de convers?o de energia e?lica que utiliza um gerador de indu??o duplamente alimentado (Double-Fed Induction Generator- DFIG). Testes de robustez e desempenho foram realizados com incertezas nos par?metros da m?quina e varia??es de refer?ncia de velocidade

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