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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.
51

Programmed harmonic reduction in inverters and controlled rectifiers

Deib, Deib Ali. January 1993 (has links)
Thesis (Ph. D.)--Ohio University, August, 1993. / Title from PDF t.p.
52

Polyspectral signal analysis techniques for interharmonics in shipboard power systems

Kim, Taekhyun, January 1900 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2008. / Vita. Includes bibliographical references.
53

Computer controlled generation of PWM waveform using harmonic distortion minimization scheme

Dalvi, Mahesh. January 1997 (has links)
Thesis (M.S.)--Ohio University, June, 1997. / Title from PDF t.p.
54

Harmonic simulation of traction system /

Lai, Tsz-ming, Terence. January 2000 (has links)
Thesis (M. Phil.)--University of Hong Kong, 2000. / Includes bibliographical references.
55

Fuzzy logic control for an active power line conditioner /

Kirawanich, Phumin, January 2002 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2002. / Typescript. Vita. Includes bibliographical references (leaves 95-98). Also available on the Internet.
56

Fuzzy logic control for an active power line conditioner

Kirawanich, Phumin, January 2002 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2002. / Typescript. Vita. Includes bibliographical references (leaves 95-98). Also available on the Internet.
57

FACTS device modelling in the harmonic domain : a thesis presented for the degree of Doctor of Philosophy in Electrical and Electronic Engineering at the University of Canterbury, Christchurch, New Zealand /

Collins, Christopher Donald. January 1900 (has links)
Thesis (Ph. D.)--University of Canterbury, 2006. / Typescript (photocopy). "April 2006." Includes bibliographical references (p. [117]-121). Also available via the World Wide Web.
58

Multi level reinjection ac/dc converters for HVDC : a thesis presented for the degree of Doctor of Philosophy in Electrical and Computer Engineering at the University of Canterbury, Christchurch, New Zealand /

Perera, Lasantha Bernard. January 1900 (has links)
Thesis (Ph. D.)--University of Canterbury, 2006. / Typescript (photocopy). "February 2006." Includes bibliographical references (p. [151]-160). Also available via the World Wide Web.
59

Experimental studies in laser interaction with wavelength scale matter via second harmonic production and hard x-ray production

Sumeruk, Hernan Ariel, January 1900 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2006. / Vita. Includes bibliographical references.
60

Estudo e implementação de um filtro ativo de potência paralelo aplicado em sistemas trifásicos a quatro fios com controle e modulação vetorial

Acordi, Edson Junior 31 August 2012 (has links)
O presente trabalho realiza o estudo e implementação de um filtro ativo de potência paralelo (FAPP) aplicado em sistemas trifásicos a quatro fios utilizando a topologia de um inversor de tensão four-legs, visando a redução do conteúdo harmônico gerado por cargas não lineares e a compensação de reativos. A geração das correntes de referência de compensação é obtida através da estratégia de compensação baseada no sistema de eixos de referência síncrona (SRF) a qual utiliza conceitos de controle vetorial. O sincronismo do sistema SRF é realizado através de um circuito q-PLL (q-Phase Locked Loop) o qual é baseado no conceito da teoria da potência instantânea imaginária (teoria pq). A análise matemática da topologia four-legs é desenvolvida a fim de se obter um modelo linear em espaço de estados que represente o sistema físico para os sistemas de coordenadas abc, αβ0 e dq0. O método de controle proposto é implementado em eixos dq0, através de três controladores do tipo PI (Proporcional-Integral), os quais são projetados utilizando os conceitos de margem de estabilidade. Um estudo detalhado da modulação Space Vector aplicada a sistemas trifásicos four-legs é apresentado. Resultados de simulações são apresentados para validar o modelo do filtro proposto bem como a técnica de controle aplicada. Por fim, os resultados experimentais obtidos são avaliados considerando a a recomendação IEEE 519-1992 para mostrar a capacidade do FAPP na supressão de correntes harmônicas e compensação de potência reativa. / This work deals with the study and analysis of a parallel active power filter (APF) applied to three-phase four-wire systems using a four-leg inverter, aiming the suppresion of the harmonic content of non-linear loads and reactive power compensation. The generation of the compensation current references is obtained by means of the strategy based on the synchronous reference frame (SRF) system, which utilizes the concepts of vector control. The timing of the SRF system is performed through a q-PLL (q-Phase Locked Loop) circuit that is based on the imaginary instantaneous power theory. Mathematical analysis is developed in order to obtain a linear model in state space that represents the physical system in the coordinate systems abc, αβ0 and dq0. The proposed control method is implemented in dq0 axes through three Proportional-Integral (PI) controllers, which are designed using the concepts of stability margin. A detailed study of Space Vector modulation applied to three-phase four-leg inverter is presented. Simulation results are presented to validate the model of the APF and the control technique adopted. Finally, experimental results are obtained and evaluated considering the recommendation IEEE 519-1992 to show the capability of the parallel APF of current harmonic suppression and reactive power comensation.

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