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Dissertations / Theses on the topic 'Power conversion harmonics'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Grant, David. "High power density AC to DC conversion with reduced input current harmonics." Thesis, University of Newcastle upon Tyne, 2015. http://hdl.handle.net/10443/3906.

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This thesis investigates the bene ts and challenges arising from the use of minimal capacitance in AC to DC converters. The purpose of the research is to ultimately improve the power density and power factor of electrical systems connected to the grid. This is carried out in the con- text of a low cost brushless DC drive system operating from an o ine power supply. The work begins with a review of existing applications where it is prac- tical to use a limited amount of DC link capacitance. The vast majority of these have a load which is insensitive to supply power variations at twice the line

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2

Rosado, Sebastian Pedro. "Analysis of Electric Disturbances from the Static Frequency Converter of a Pumped Storage Station." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/34448.

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The present work studies the disturbances created in the electric system of a pumped storage power plant, which is an hydraulic generation facility where the machines can work as turbines or pumps, by the operation of a static frequency converter (SFC). The SFC is used for starting the synchronous machines at the station when in the pump mode. During the starting process several equipment is connected to the SFC being possible to get affected by the disturbances generated. These disturbances mainly include the creation of transient overvoltages during the commutation of the semiconductor devic

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3

Prasai, Anish. "Direct dynamic control of impedance for VAR and harmonic compensation." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42816.

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Reactive power is critical to reliable operation of the modern AC power system. There is a plethora of motor-loads, transformers, and power-electronic loads connected to the power grid, which consume reactive power for normal operation. Transmission lines also consume reactive power when they are loaded above their surge impedance loading (SIL). Reactive power can exact opportunity cost due to reduced capacity of the lines to carry real power, which in turn lowers revenue. Most transmission owners (TOs) levy large penalties against load serving entities (LSEs), industrial facilities, and o

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4

MAIA, Ayslan Caisson Norões. "Sistemas de conversão de energia multiníveis obtidos através da interconexão de módulos de conversores estáticos de potência de dois níveis." Universidade Federal de Campina Grande, 2016. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1561.

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Submitted by Emanuel Varela Cardoso (emanuel.varela@ufcg.edu.br) on 2018-08-27T19:35:43Z No. of bitstreams: 1 AYSLAN CAISSON NORÕES MAIA – TESE (PPGEEI) 2016.pdf: 13981392 bytes, checksum: 9ea0aa715fdf8400283e71381b49a21b (MD5)<br>Made available in DSpace on 2018-08-27T19:35:43Z (GMT). No. of bitstreams: 1 AYSLAN CAISSON NORÕES MAIA – TESE (PPGEEI) 2016.pdf: 13981392 bytes, checksum: 9ea0aa715fdf8400283e71381b49a21b (MD5) Previous issue date: 2016-02-22<br>Nesse trabalho são apresentadas contribuições na área de identificação de sistemas representados em espaço de estados. É proposta uma met

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5

Pelicer, Junior João Carlos. "Emprego de topologia boost semicontrolada para mitigação do conteúdo harmônico de corrente em conversores de 12 pulsos /." Ilha Solteira, 2019. http://hdl.handle.net/11449/180812.

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Orientador: Falcondes José Mendes de Seixas<br>Resumo: Os conversores multipulsos têm sido muito utilizados para a melhoria da qualidade de energia elétrica em sistemas de retificação trifásicos. O principal motivo para tal afirmação é a robustez apresentada por esses conversores, aliada às características intrínsecas da estrutura, que resulta no cancelamento natural de certas componentes de corrente na rede, devido ao defasamento angular provocado pela ação do transformador ou autotransformador utilizado. O que se propõe nesse trabalho é a substituição de cada ponte retificadora a diodos, pre

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6

Seixas, Mafalda Maria Morais. "Conversão eólica offshore ligada à rede elétrica: modelação e simulação." Doctoral thesis, Universidade de Évora, 2015. http://hdl.handle.net/10174/16084.

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A tese incide sobre a modelação e simulação de um sistema de conversão de energia eólica offshore com ligação à rede elétrica por transmissão de energia elétrica estudada quer em corrente alternada quer em corrente contínua, no contexto atual de reestruturação do setor elétrico, e integrando a dinâmica relevante. Além da transmissão de energia elétrica, o sistema é constituído por uma plataforma flutuante semissubmersível; uma turbina eólica de velocidade variável; um sistema de transmissão de energia mecânica cuja dinâmica é descrita respetivamente por uma, duas, três ou cinco massas girantes

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7

Harouni, Zied. "Conception et caractérisation d’une Rectenna à double polarisation circulaire à 2.45 GHz." Thesis, Paris Est, 2011. http://www.theses.fr/2011PEST1026/document.

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Les travaux présentés dans ce mémoire s'inscrivent dans la thématique de la transmission d'énergie sans fil, appliquée à l'alimentation à distance de capteurs, de réseaux de capteurs et d'actionneurs à faible consommation. Cette étude porte sur la conception, la caractérisation, et la mesure d'un circuit Rectenna (Rectifying antenna) à double polarisation circulaire à 2.45 GHz, compact et à rendement de conversion RF-DC optimisé. Un outil d'analyse globale basé sur la méthode itérative a été développé et exploité pour valider la faisabilité de cette analyse. La diode Schottky a été modélisée e

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8

Ghasemi, Negareh. "Improving ultrasound excitation systems using a flexible power supply with adjustable voltage and frequency to drive piezoelectric transducers." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/61091/1/Negareh_Ghasemi_Thesis.pdf.

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The ability of a piezoelectric transducer in energy conversion is rapidly expanding in several applications. Some of the industrial applications for which a high power ultrasound transducer can be used are surface cleaning, water treatment, plastic welding and food sterilization. Also, a high power ultrasound transducer plays a great role in biomedical applications such as diagnostic and therapeutic applications. An ultrasound transducer is usually applied to convert electrical energy to mechanical energy and vice versa. In some high power ultrasound system, ultrasound transducers are applied

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9

Du, Nan. "Beyond "More than Moore": Novel applications of BiFeO3 (BFO)-based nonvolatile resistive switches." Doctoral thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-202508.

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The size reduction of transistors has been the main reason for a successful development of semiconductor integrated circuits over the last decades. Because of the physically limited downscaling of transistors, alternative technologies namely the information processing and nonvolatile resistive switches (also termed memristors) have come into focus. Memristors reveal a fast switching speed, long retention time, and stable endurance. Nonvolatile analog bipolar resistive switching with a considerable large On/Off ratio is reported in BiFeO3 (BFO)-based resistive switches. So far resistive switche

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10

Zargari, Navid Reza. "AC/DC power conversion schemes with unity power factor and minimum harmonic distortion." Thesis, 1995. http://spectrum.library.concordia.ca/4758/1/NN01278.pdf.

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In most line-interfaced power converter applications the ac mains voltage is first rectified into a dc voltage or current, which is subsequently converted into voltages and currents of appropriate amplitude, frequency and shape to meet the load requirements. The front-end rectifier must satisfy three main requirements: (a) Minimum harmonic injection into the ac mains should comply with limits imposed by recommended standards such as IEEE-519, IEC-555. (b) High input power factor to reduce the reactive power requirements. (c) High efficiency and reliability and low cost to ensure competitivenes

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11

Liu, Shang-Yi, and 劉上逸. "Design of 2.45/5.2 GHz Dual-band Low-power Direct-conversion Harmonic Mixer." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/11778433075664495614.

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碩士<br>國立交通大學<br>電子工程系所<br>93<br>The aim in this thesis is mainly based on the design of 2.45/5.2 GHz dual-band low-power direct-conversion harmonic mixer in the receiver front-end of 802.11a/b wireless local area network (WLAN) system using standard 0.18um CMOS process. Also, a narrow band 5.2GHz step-gain direct-conversion harmonic mixer is designed and analysis for 802.11a WLAN system. The two harmonic mixers were verified through individual chips. In the first chip, a 5.2GHz step-gain direct-conversion harmonic mixer for 802.11a WLAN system is designed and analyzed. The harmonic mixer cance

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12

Lin, Yu Huang, and 林育煌. "Development of a Grid-connected Wind Energy Conversion System with Power Factor Correction and Harmonic Improvement." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/01221489404937423905.

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碩士<br>長庚大學<br>電機工程學系<br>99<br>The purpose of the thesis is to develop a DSP-based grid-connected wind energy conversion system (WECS), capable of compensating the power factor and current harmonic for the wind-driven generator and the grid utility. The wind power is converted to the grid through a fully digital-controlled laboratory prototype which consists of a 1.5kW wind driven permanent magnet synchronous generator (PMSG), a three-phase switching rectifier, a push-pull converter, and a grid-tied single phase inverter. The three-phase switching rectifier is used to regulate the wind turbine

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13

Kijatkin, Christian. "Ultrafast Photon Management: The Power of Harmonic Nanocrystals in Nonlinear Spectroscopy and Beyond." Doctoral thesis, 2019. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-201904011323.

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The present work broaches the physics of light-matter interaction, chiefly using nonlinear optical spectroscopy in a newly developed framework termed as Photon Management Concept. This way, existing fragments dealing with specific properties of harmonic and upconversion nanoparticles (HNPs/UCNPs) are consolidated into a full and coherent picture with the primary goal of understanding the underlying physical processes and their impact on the application side, especially in terms of imaging techniques, via suitable experimental and numerical studies. Contemporary optical setups involving cont

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14

Costa, Cristian Rebelo da. "Desenvolvimento de um filtro ativo de potência paralelo monofásico com conversor de 5 níveis." Master's thesis, 2018. http://hdl.handle.net/1822/59491.

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Dissertação de mestrado em Engenharia Eletrónica e de Computadores<br>O aproveitamento da energia elétrica e, consequentemente, a rentabilidade do consumo da mesma têm sido alvo de estudo nos últimos anos. Tal preocupação deve-se à abundância de equipamentos eletrónicos no mercado, cuja ligação é a principal causa da introdução de conteúdo harmónico na rede elétrica, provocando a distorção das formas de onda da tensão e outros problemas associados. Atualmente, existem várias soluções que contribuem para atenuar estes fenómenos, de forma a proporcionar uma boa qualidade de energia elétrica (QEE

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15

Oliveira, Cátia Patrícia Fraga. "Desenvolvimento de um filtro ativo de potência paralelo monofásico baseado num conversor fonte de corrente com barramento CC reduzido." Master's thesis, 2018. http://hdl.handle.net/1822/59998.

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Dissertação de mestrado em Engenharia Eletrónica Industrial e Computadores<br>Atualmente, grande parte dos equipamentos eletrónicos utilizados comportam-se como cargas não-lineares. Contudo, este tipo de cargas consomem correntes não sinusoidais, contaminando a rede elétrica com harmónicas de corrente. A presença das harmónicas na rede elétrica resulta num aumento das perdas relacionadas com o transporte e distribuição de energia elétrica, bem como numa degradação do funcionamento da maior parte dos equipamentos ligados à rede elétrica, principalmente os mais sensíveis. Estes problemas da Qual

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16

Gomes, Rui Manuel Marques. "Desenvolvimento de um Conversor CA-CC para o Condicionador Ativo Série de um UPQC Trifásico." Master's thesis, 2019. http://hdl.handle.net/1822/66038.

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Dissertação de mestrado em Engenharia Eletrónica e de Computadores<br>Com o crescente incremento do uso de cargas não-lineares, cada vez mais tem aumentado a degradação da qualidade de energia elétrica. Este aumento deve-se ao facto de que muitos dos equipamentos que utilizamos hoje em dia requerem que se converta a tensão alternada da rede elétrica em tensão contínua através de díodos ou tirístores. Estes equipamentos, chamados de cargas não-lineares, provocam vários tipos de problemas em relação à qualidade de energia elétrica, como distorção das formas de onda de tensão e corrente, sobreaqu

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17

Rodrigues, Ana Maria da Cunha. "Desenvolvimento do conversor CC-CA trifásico de um sistema de advanced load-shift." Master's thesis, 2019. http://hdl.handle.net/1822/64778.

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Dissertação de mestrado em Engenharia Eletrónica e de Computadores<br>Devido à previsível escassez e às desvantagens inerentes ao uso de combustíveis fósseis na produção de energia elétrica, tem-se vindo a apostar em fontes de energia renovável, nomeadamente a eólica e a solar fotovoltaica. Contudo, estes tipos de fontes apresentam como principais desvantagens a intermitência na produção de energia, bem como a necessidade de um equipamento de interface com a rede elétrica, que tipicamente introduz problemas de qualidade de energia elétrica (QEE). Assim, de forma a possibilitar a integração de

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18

Tanta, Mohamed. "Rail power conditioners based on modular multilevel converter in AC railway networks." Doctoral thesis, 2020. http://hdl.handle.net/1822/76856.

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Programa doutoral em Engenharia Electrónica e de Computadores<br>Railway systems have progressively been developed since James Watt presented a technique of converting steam power into a circular movement back in 1763. With the novelty of steam engines at that time and the increasing of railway networks, railway industry quickly became an economic catalyst throughout the world due to the advantages of passenger and freight transport. In 1879, Siemens & Halske company introduced the world’s first electric train in the city of Berlin, consisting of a locomotive and three wagons, and supplie

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19

Du, Nan. "Beyond "More than Moore": Novel applications of BiFeO3 (BFO)-based nonvolatile resistive switches." Doctoral thesis, 2015. https://monarch.qucosa.de/id/qucosa%3A20443.

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The size reduction of transistors has been the main reason for a successful development of semiconductor integrated circuits over the last decades. Because of the physically limited downscaling of transistors, alternative technologies namely the information processing and nonvolatile resistive switches (also termed memristors) have come into focus. Memristors reveal a fast switching speed, long retention time, and stable endurance. Nonvolatile analog bipolar resistive switching with a considerable large On/Off ratio is reported in BiFeO3 (BFO)-based resistive switches. So far resistive switche

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