Thesis (M.Sc.(Engineering))--University of the Witwatersrand, Faculty of Engineering, 2000.

Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1981. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Includes bibliographical references. / by Sherman Man Chan. / Ph.D.

published_or_final_version / Electrical and Electronic Engineering / Master / Master of Philosophy

Thesis (Ph. D.)--University of Missouri-Columbia, 1997. / Typescript. Vita. Includes bibliographical references (leaves 76-80). Also available on the Internet.

Thèse (M.Eng.) -- Université du Québec à Chicoutimi, 2007. / La p. de t. porte en outre: Mémoire présenté comme exigence partielle de la maîtrise en ingénierie. CaQCU Bibliogr.: f. [121]-124. Document électronique également accessible en format PDF. CaQCU

Thesis (Ph. D.)--University of Missouri-Columbia, 1997. / Typescript. Vita. Includes bibliographical references (leaves 76-80). Also available on the Internet.

The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on October 6, 2009). Thesis advisor: Dr. Naz E. Islam. Includes bibliographical references.

The management of parallel and series resonance conditions is important for ensuring that harmonic levels are managed on utility networks, and that shunt compensators are able to operate without constraints for various network conditions (states). For these and similar problems, harmonic impedance assessment of the ac network is required for the design of ac filter or shunt capacitor bank installations. This is particularly important for large installations connected to HV or EHV systems, because resonances at these voltage levels tend to be highly un-damped resulting in potentially damaging voltage and current amplification. The objective of this dissertation was to develop and demonstrate a design methodology which makes use of network impedance assessment methods to provide robust harmonic integration of large shunt compensators into a transmission and HVDC systems. The design methodology has two aspects. The first part considers network modeling, evaluation of different models and simulation of harmonic impedance. In the second part, methods of analyzing and assessing the simulated harmonic impedance are developed. A detailed step-by-step approach was taken in the development of the design methodology. The methodology was documented as a guideline and accompanied by the development of an Excel tool that can be used to assess the simulated harmonic impedance. The Excel tool permits a systematic assessment of the simulated network impedance where shunt compensators are integrated into transmission systems. The tool also ensures that the design of transmission and HVDC ac shunt compensation is optimally robust in terms of harmonic resonances. The theoretical and computational review has been tested and demonstrated on the existing Eskom Transmission system through several case studies. The results have shown the merits of the design methodology. / Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2013.

Thesis (Ph. D.)--Ohio State University, 2007. / Full text release at OhioLINK's ETD Center delayed at author's request

Este trabalho apresenta o desenvolvimento e a implementação de um filtro ativo trifásico universal, o qual é composto pela conexão de três módulos monofásicos. Cada módulo monofásico é independente e é controlado por um processador digital de sinais. A estrutura de potência utilizada em cada módulo é uma topologia de três braços em que dois conversores compartilham um braço, de forma que o circuito apresenta número de componentes de potência reduzido na versão monofásica e pode operar sem o uso de um transformador. O filtro ativo proposto é capaz de compensar a distorção harmônica e regular o nível da tensão entregue para a carga. Ele também compensa a corrente da carga conectada na saída do filtro, corrigindo seu conteúdo harmônico e fator de potência. Apresenta-se uma revisão bibliográfica sobre alguns assuntos referentes à qualidade de energia elétrica, como os conceitos de distorção harmônica, seus efeitos e as normas pertinentes. Em seguida, as principais topologias de filtros ativos são apresentadas. Três módulos monofásicos, de 1500 W cada, são implementados e o funcionamento da estrutura de três braços, bem como os principais parâmetros do circuito de potência são analisados. Um algoritmo PLL (Phase Locked Loop) digital é empregado para o sincronismo de cada módulo. Controladores repetitivos são utilizados para o controle da tensão e da corrente. Os detalhes da estratégia de controle, bem como o projeto do circuito de sincronismo e dos controladores digitais são apresentados. Os resultados teóricos obtidos são comprovados através da simulação e da experimentação do protótipo implementado. A utilização do filtro ativo possibilitou a redução do conteúdo harmônico das cargas utilizadas nos testes, bem como elevou o fator de potência e corrigiu a distorção e o nível da tensão entregue para a carga. / This paper presents the development and implementation of a three-phase universal active filter consisting of three single-phase modules. Each single-phase module is independent and is controlled by a digital signal processor. The power structure used in each module is a three-arm topology in which two converts share one arm, so that the circuit has a reduced count of components and can operate without using a transformer. The proposed active filter can compensate harmonic distortion and adjust the voltage level delivered to the load. It also compensates the load current connected to the filter output, correcting its harmonic content and power factor. It presents a literature review on some issues related to power quality, as the concepts of harmonic distortion, its effects and relevant standards. Then the principal topologies used in active filters are presented. Three single-phase modules, each one of 1500 W, are implemented and the operation principles of the three-arms structure and the main parameters of the power circuit are analyzed. A digital PLL (Phase Locked Loop) is employed to synchronize each module. Repetitive controllers are used to control the voltage and current. Details of the control strategy and circuit design of the synchronism and digital controllers are presented. The results are verified through simulation and experimentation of the implemented prototype. Using the active filter was possible to reduce the harmonic content of the loads used in the experimental tests as well as increasing the power factor and to correct the distortion and voltage level supplied to the load.