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Dissertations / Theses on the topic 'THD (Total Harmonic Distortion)'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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1

Souza, Wesley Angelino de [UNESP]. "Desenvolvimento de sistema de aquisição e processamento para aplicações em qualidade de energia." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/87201.

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Made available in DSpace on 2014-06-11T19:22:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-08-19Bitstream added on 2014-06-13T20:49:15Z : No. of bitstreams: 1 souza_wa_me_bauru.pdf: 3309362 bytes, checksum: a37e3a04f60e9ebbd2f490264d198dbf (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Este trabalho teve como o desenvolvimento de um sistema de aquisição e processamento de dados para aplicações em Qualidade de Energia Elétrica (QEE). Do ponto de vista dos circuitos de hardware desenvo
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Souza, Wesley Angelino de. "Desenvolvimento de sistema de aquisição e processamento para aplicações em qualidade de energia /." Bauru : [s.n.], 2011. http://hdl.handle.net/11449/87201.

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Resumo: Este trabalho teve como o desenvolvimento de um sistema de aquisição e processamento de dados para aplicações em Qualidade de Energia Elétrica (QEE). Do ponto de vista dos circuitos de hardware desenvolvidos, buscou-se utilizar componentes de precisão elevada para o sensoriamento e condicionamento dos sinais de tensão e corrente. Além disso, foi implementado um algoritmo de auto calibração das medidas, em função da temperatura no medidor implementado. O processamento dos dados foi realizado através de um processador digital de sinais (DSP, Digital Sinal Processor) de 32 bits, com aritm
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Tella, Pranavi Chowdari Islam Naz E. "The study of single phase diode rectifiers with high power factor and low total harmonic distortion." Diss., Columbia, Mo. : University of Missouri--Columbia, 2008. http://hdl.handle.net/10355/5677.

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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.
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Earick, Weston R. "DESIGN OF A HIGH-POWER, HIGH-EFFICIENCY, LOW-DISTORTION DIRECT FROM DIGITAL AMPLIFIER." Wright State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=wright1155008919.

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Tedesco, Lawrence A. Jr. "A Unified Measure of Audio System Fidelity." ScholarWorks@UNO, 2007. http://scholarworks.uno.edu/td/598.

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A new technique to qualitatively measure distortion in dynamically controlled audio systems using non-stationary noise sequences is explored and compared to traditional methods based upon stationary test signals. This technique can easily be adapted to give a qualitative measure of distortion as a function of the perceived Sound Pressure Level (SPL).
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Neužil, Jan. "Uživatelské rozhraní pro HP89410A." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217775.

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The aim of this thesis was to develop user interface in LabVIEW to make typical measurements with spectral analyzer HP89410A There is introduced the theory of operation of an analogue heterodyne and a digital FFT spectral analyzer. It is explained the background of the Fast Fourier Transform. There are discussed the key settings in measuring with FTT analyzer, like window function, bandwidth, number of frequency points, or the averaging. Further is described the program, which was developed for measuring frequency characteristic by white noise and by stepped measurement. It was also made a mod
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Moussa, Hassan. "Contribution to the Decentralized Energy Management of Autonomous AC-Microgrid." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0161/document.

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Cette thèse porte sur des micro-réseaux AC isolées qui permettent l’intégration des ressources énergétiques distribuées (DER) pouvant fournir leur énergie d'alimentation existante de manière contrôlée pour assurer le bon fonctionnement global du système. L'interconnexion d'un DER à une micro-réseau s'effectue habituellement en utilisant un convertisseur d'interface distribué (DIC) (i.e. un bloc d'interface d'électronique de puissance générale) qui est constitué d’un module de convertisseur à l'entrée de la source, un onduleur de tension (VSI), un module d'interfaçage de sortie, et le module de
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Hassan, Aakash. "Improving the efficiency, power quality, and cost-effectiveness of solar PV systems using intelligent techniques." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2023. https://ro.ecu.edu.au/theses/2676.

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Growing energy demand, depleting fossil fuels, and increasing environmental concerns lead to adaptation to clean and sustainable energy sources. Renewable energy sources are now believed to play a critical role in diminishing the deteriorating environment, supplying power to remote areas with no access to the grid, and overcoming the energy crisis by reducing the stress on existing power networks. Therefore, an upsurge in renewablesbased energy systems development has been observed during the previous few decades. In particular, solar PV technology has demonstrated extraordinary growth due to
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Moussa, Hassan. "Contribution to the Decentralized Energy Management of Autonomous AC-Microgrid." Electronic Thesis or Diss., Université de Lorraine, 2017. http://www.theses.fr/2017LORR0161.

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Cette thèse porte sur des micro-réseaux AC isolées qui permettent l’intégration des ressources énergétiques distribuées (DER) pouvant fournir leur énergie d'alimentation existante de manière contrôlée pour assurer le bon fonctionnement global du système. L'interconnexion d'un DER à une micro-réseau s'effectue habituellement en utilisant un convertisseur d'interface distribué (DIC) (i.e. un bloc d'interface d'électronique de puissance générale) qui est constitué d’un module de convertisseur à l'entrée de la source, un onduleur de tension (VSI), un module d'interfaçage de sortie, et le module de
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10

Kerzerho, Vincent. ""Analogue Network of Converters": a DfT Technique to Test a Complete Set of ADCs and DACs Embedded in a Complex SiP or SoC." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2008. http://tel.archives-ouvertes.fr/tel-00364546.

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Une nouvelle méthode de test pour les convertisseurs ADC et DAC embarqués dans un système complexe a été développée en prenant en compte les nouvelles contraintes affectant le test. Ces contraintes, dues aux tendances de design de systèmes, sont un nombre réduit de point d'accès aux entrées/sorties des blocs analogiques du système et une augmentation galopante du nombre et des performances des convertisseurs intégrés. La méthode proposée consiste à connecter les convertisseurs DAC et ADC dans le domaine analogique pour n'avoir besoin que d'instruments de test numériques pour générer et capture
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Grossman, Hy. "A NEXT GENERATION AIRCRAFT POWER MONITORING SYSTEM." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604535.

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ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>Historically, aircraft power monitoring has required the use of multiple signal conditioning functions to measure various parameters including voltage, current, frequency and phase. This information was then post processed to determine the characteristics of the 3-phase power quality on the aircraft. Recent developments in embedded DSP processors within signalconditioning systems provide the i
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Dey, Sourav. "Large-Signal Analysis of Buck and Interleaved Buck DC-AC Converters." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1409578634.

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Kirchmann, Carl Christian. "Automatic acoustic tests of conference phones." Thesis, Uppsala universitet, Fasta tillståndets elektronik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326253.

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This master thesis was completed at Limes Audio in Umeå. Limes Audio are specialized in speech enhancement software which is mostly used in conference phones. Their software is used to reduce noise, echo cancellation as well as reduction of distortion. When a conference phone is malfunctioning it can be troublesome to find the cause of the problem. Common issues that lead to perceived poor audio quality are rattling plastics, loose parts and an environment with demanding acoustics. There is a need for automatic tests to run on conference phone which can diagnose audio quality and the acoustics
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Häger, Emil. "Performance Evaluation of Medium-Power Voltage Inverters." Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-118568.

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Power inverters, used to convert DC power to AC, are often used in e.g. solar power applications. However, they tend to be impractically large and expensive; as such, power miniaturization is an active research area. In this thesis, several classes of modern power inverters are evaluated and compared with regards to size, efficiency and output quality in order to identify areas of potential improvement. Methods for estimation of THD, power losses and input ripple are created and verified against a simulation of a five-level neutral-point-clamped inverter with SPWM control. Finally, this design
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Gokgoz, Sinan. "A Stand-alone Induction Powered Current And Current Harmonics Measurement System For Distribution Lines." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614967/index.pdf.

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The presence of information and communication technologies in the field of energy is increasing every day. Smart grid subject which aims to increase the percentage of energy generation through renewable resources and to make consumers to be involved in grid actively, is gaining importance day by day. In order to provide an effcient and reliable operation of smart grid network, it is necessary to collect relevant parameters from network components via communication infrastructure and to evaluate collected information. Also, with the inclusion of distributed energy sources in the power lines, co
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16

Joca, Davi Rabelo. "TÃcnica de ModulaÃÃo para ReduÃÃo de DHT em Inversor MultinÃvel com Capacitor Flutuante de TrÃs NÃveis." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11222.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Diante da necessidade em aperfeiÃoar as tecnologias existentes para a conversÃo de energia elÃtrica em sistemas de alta potÃncia, este trabalho tem por finalidade projetar, analisar e implementar experimentalmente uma tÃcnica de modulaÃÃo com o intuito de reduzir o conteÃdo harmÃnico da tensÃo de saÃda em um inversor multinÃvel com capacitor flutuante de trÃs nÃveis. Algumas das diversas tÃcnicas de modulaÃÃo (PSPWM, LSPWM, HE-PWM e CSV-PWM) foram analisadas e implementadas no controlador digital FPGA a fim de comparar suas caracte
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Bernáth, František. "SW nadstavba analyzátoru sítí pro automatický návrh nn kompenzační jednotky na základě měření." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218704.

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Thesis is devoted to a problem of Power Factor Correction on the low voltage level. It has still its own difficulties despite the fact that topic moved through long development. The main goal of this work is to offer reader variable procedure considering design process. It is based on use of measured data of network analyzer Meg30. The design algorithm has to share a maximum of eventual influencing factors. Therefore the body of master thesis goes through detailed analysis of Power Factor Correction.
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Vývoda, Marek. "Kompenzace účiníku a posouzení zpětných vlivů indučního ohřevu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219077.

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This Diploma thesis deals with design of for power factor correction device for mid-frequency-range induction heating and also with assessment of correction device influence in harmonically distorted environment from the distribution net point of view. Research chapters contain of main characteristics of electrical power quality and theoretical background of reactive power, which is in our case caused by driven non-linear elements. Further, the heating power supply block is explained and simulations of power consumption in Matlab - Simulink is done, within the prove of corrective tools design.
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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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Sahoo, Smrutirekha. "Impact Study: Photo-voltaic Distributed Generation on Power System." Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-32369.

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The grid-connected photo-voltaic (PV) system is one of the most promising renewable energy solutions which offers many benefits to both the end user and the utility network and thus it has gained the popularity over the last few decades. However, due to the very nature of its invariability and weather dependencies, the large scale integration of this type of distributed generation has created challenges for the network operator while maintaining the quality of the power supply and also for reliable and safe operations of the grids. In this study, the behavioral impact of large scale PV system
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Al, Shammeri Bashar Mohammed Flayyih. "A novel induction heating system using multilevel neutral point clamped inverter." Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/8305.

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This thesis investigates a novel DC/AC resonant inverter of Induction Heating (IH) system presenting a Multilevel Neutral Point Clamped (MNPCI) topology, as a new part of power supply design. The main function of the prototype is to provide a maximum and steady state power transfer from converter to the resonant load tank, by achieving zero current switching (ZCS) with selecting the best design of load tank topology, and utilizing the advantage aspects of both the Voltage Fed Inverter (VFI) and Current Fed Inverter (CFI) kinds, therefore it can considered as a hybrid-inverter (HVCFI) category
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Tan, Benjamin H. "A Novel Arc Welding Power Supply with Improved Power Factor Correction." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2199.

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This paper presents the design and development of a novel Arc Welding Power Supply utilizing a modified two-switch forward converter topology. The proposed design improves the power quality by improving power factor to near unity and reducing total harmonic distortion. State space analysis of the proposed circuit showed that the circuit followed a boost-buck input output relationship. Simulation of the circuit was first implemented in LTspice to verify the functionality of the new topology. Hardware implementation of the proposed design was built on a scaled-down prototype for a proof-of-conce
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Fernández, Palomeque Efrén Esteban. "Optimization of a CSI inverter and DC/DC elevator with silicon carbide devices, for applications in electric traction systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/666485.

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The applications of electric traction systems currently focus on developing technologies with greater energy efficiency and lower environmental impact. Manufacturers of hybrid and electric vehicles are looking for ways to improve and optimize the efficiency of their models. Manufacturers are looking for more efficient and more compact converter topologies. The use of new band gap materials in the construction of these topologies has generated many debates and new lines of research especially in the optimization of these topologies. The silicon carbide (SiC) based switching devices provide sig
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Філянін, Данило Володимирович. "Методи і засоби інформаційного забезпечення режимів електричних мереж в умовах низької якості електроенергії". Thesis, Національний технічний університет України "Київський політехнічний інститут імені Ігоря Сікорського", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40949.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.14.02 – електричні станції, мережі і системи – Національний технічний університет України "Київський політехнічний інститут імені Ігоря Сікорського", Київ, 2018. Дисертація присвячена науково-прикладній проблемі – пошуку винуватців гармонічних спотворень в електричних мережах та підвищенню якості електроенергії шляхом створення системи діагностики і контролю на базі АСКОЕ. Обґрунтовано використання технології розподілених вимірювань для пошуку винуватців спотворень. Розроблено модифікацію методу гармонічн
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Філянін, Данило Володимирович. "Методи і засоби інформаційного забезпечення режимів електричних мереж в умовах низької якості електроенергії". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40946.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.14.02 – електричні станції, мережі і системи – Національний технічний університет України "Київський політехнічний інститут імені Ігоря Сікорського", Київ, 2018. Дисертація присвячена науково-прикладній проблемі – пошуку винуватців гармонічних спотворень в електричних мережах та підвищенню якості електроенергії шляхом створення системи діагностики і контролю на базі АСКОЕ. Обґрунтовано використання технології розподілених вимірювань для пошуку винуватців спотворень. Розроблено модифікацію методу гармонічног
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Dušek, Samuel. "Techniky slučování kanálů za účelem zvýšení dynamického rozsahu kanálu s rozsahem ±10 V." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413045.

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Cílem této diplomové práce je změřit a vyhodnotit parametry techniky slučování kanálů, která je momentálně implementována v součástce AD7606C firmy Analog Devices. Poté, na základě výsledků z měření, navrhnout a odsimulovat několik možností, pomocí kterých by tato technika mohla dosahovat vyšších hodnot dynamického rozsahu a celkového harmonického zkreslení. V průběhů práce bylo zjištěno, že pomocí zvýšení zesílení kanálu s nižším rozsahem společně se snížením mezní frekvence celého signálového řetězce může tato technika dosahovat až 118.6 dB dynamického rozsahu, což je o 3.6 dB více, než bylo
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SILVA, Elson Natanael Moreira. "ESTIMAÇÃO PROBABILÍSTICA DO NÍVEL DE DISTORÇÃO HARMÔNICA TOTAL DE TENSÃO EM REDES DE DISTRIBUIÇÃO SECUNDÁRIAS COM GERAÇÃO DISTRIBUÍDA FOTOVOLTAICA." Universidade Federal do Maranhão, 2017. http://tedebc.ufma.br:8080/jspui/handle/tede/1296.

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Submitted by Maria Aparecida (cidazen@gmail.com) on 2017-04-17T13:14:17Z No. of bitstreams: 1 Elson Moreira.pdf: 7883984 bytes, checksum: cf59b3b0b24a249a7fd9e2390b7f16de (MD5)<br>Made available in DSpace on 2017-04-17T13:14:17Z (GMT). No. of bitstreams: 1 Elson Moreira.pdf: 7883984 bytes, checksum: cf59b3b0b24a249a7fd9e2390b7f16de (MD5) Previous issue date: 2017-02-10<br>CNPQ<br>A problem of electric power quality that always affects the consumers of the distribution network are the harmonic distortions. Harmonic distortions arise from the presence of socalled harmonic sources, which are no
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Oliveira, Francisco Hércules de. "Estudo de técnica utilizando a modulação PWM baseada em portadora aplicada ao inversores monofásicos assimétricos com diodos de grampeamento." Universidade Federal da Paraíba, 2017. http://tede.biblioteca.ufpb.br:8080/handle/tede/9783.

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Submitted by Gilvanedja Silva (gilvanedja@biblioteca.ufpb.br) on 2018-03-22T20:42:08Z No. of bitstreams: 1 arquivototal.pdf: 11929036 bytes, checksum: e796f3e04cbf0cf6da3fa9648d4f9270 (MD5)<br>Made available in DSpace on 2018-03-22T20:42:09Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 11929036 bytes, checksum: e796f3e04cbf0cf6da3fa9648d4f9270 (MD5) Previous issue date: 2017-05-25<br>This work presents a technique using carrier-based pulse width modulation (PWM) applied to single-phase asymmetrical multilevel inverters with diodes clamped, aiming to increase the amount of output voltage
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Zelený, Miroslav. "Provoz distribučních sítí s odporovými svářečkami." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219391.

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This Diploma thesis deals with assessment of the influence of two fundamental types of resistance welders operation on chosen power quality parameters at the point of common coupling (PCC) of the power network. The assessed parameters of power quality are the total harmonic distortion of the supply voltage, asymmetry of the supply voltage and the level of short term flicker at the point of common coupling. The assessment is based on the comparison of the results of computer simulations done in PSCad 4.2.0 with the requirements of technical standards. The outcome of this thesis is the determina
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Göker, Fuat, and Christoffer Hedberg. "Utvärdering av faskompenseringsmetoder för ett småskaligt vattenkraftverk : Genomgång av kondensatorbatteri, aktiv och passiv reglering, övermagnetiserad synkronmaskin, SVC och STATCOM på Fröslida kraftverk." Thesis, KTH, Hälsoinformatik och logistik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230165.

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Småskalig vattenkraft är en stor användare av reaktiv effekt då de ofta har asynkrongeneratorer. Det gör att det finns ett reellt behov för faskompensering, dels för att minska distorsion i nätet samt för att förbättra deras ekonomiska ställning, då elbolag ofta tar ut en avgift för överskridande användning av reaktiv effekt. Det ligger också i allmänhetens intresse att ha en god elkvalitet och hålla störningar och avbrott nere, vilket kan erhållas med faskompensering och filtrering av övertoner. Det finns olika tekniker för faskompensering med sina respektive för- och nackdelar som specificer
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Bissey, Sebastien. "Optimisation du coût de la consommation d'électricité dans l'habitat individuel." Thesis, Tours, 2019. http://www.theses.fr/2019TOUR4029.

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Les travaux menés durant cette thèse ont consisté à proposer des solutions pour optimiser le coût de la consommation d’électricité dans l’habitat individuel. Les outils matériels et logiciels proposés ici permettent à la fois d’estimer la rentabilité d’un système de gestion de l’électricité et l’impact des bons et simples gestes du quotidien. Dans un premier temps, des solutions permettant de faire des économies dans l’habitat individuel ont été comparées et évaluées. Le système de stockage de l’énergie électrique a été introduit. Le stockage permet entre autre de décaler la consommation d’éle
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Yan, Jun. "A Low Total Harmonic Distortion Sinusoidal Oscillator Based on Digital Harmonic Cancellation Technique." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-11204.

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Sinusoidal oscillator is intensively used in many applications, such as built-in-self-testing and ADC characterization. An innovative medical application for skin cancer detection employed a technology named bio-impedance spectroscopy, which also requires highly linear sinusoidal-wave as the reference clock. Moreover, the generated sinusoidal signals should be tunable within the frequency range from 10kHz to 10MHz, and quadrature outputs are demanded for coherent demodulation within the system. A design methodology of sinusoidal oscillator named digital-harmonic-cancellation (DHC) technique i
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33

Ni, Chia-Lung, and 倪嘉隆. "0.99 PF and 1.7% THD by Line Voltage Recovery and Total Harmonic Distortion Optimizer in Power Factor Correction Controller." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/54jh26.

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碩士<br>國立交通大學<br>電控工程研究所<br>101<br>As populations increase and countries industrialize, the world’s demand for energy increases. In recent years, the energy-shortage problem becomes more serious. Therefore, the issue of green power is respected gradually. Power factor correction (PFC) can shape the input current of off-line power supplies to be in-phase with the input AC voltage in order to maximize the available real power from the AC source to achieve high power factor (PF). The total harmonic distortion (THD) of input current is an important factor for PF. Considering high power factor (PF)
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34

Chang, Chun, and 張鈞. "Reduction of the Total Harmonic Distortion of a Moving-Coil Loudspeaker by Initially Repositioning its Voice Coil." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/78626355601104271775.

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碩士<br>逢甲大學<br>電聲碩士學位學程<br>100<br>The nonlinear effect of a moving-coil loudspeaker, originating from its magnetic coupling factor and the system’s stiffness, presents a significant impact on the sound quality. For improving the sound quality, this article proposes an approach to reduce the total harmonic distortion (THD) by adjusting the initial position of its voice-coil. First, a mathematical model involving the nonlinearities of force factor, mechanical stiffness, and inductance of voice coil is constructed and then solved using a novel algorithm called the parameter spline difference metho
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35

Chien, Shih-Hai, and 錢世海. "A Study on Calculating the Optimal Turn-on Angle of Multilevel Cascade Inverter with Particle Swarm Optimization to Reduce Total Harmonic Distortion and the Verification of Hardware-in-the-loop." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/31463317801239457041.

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碩士<br>國立聯合大學<br>電機工程學系碩士班<br>102<br>The optimal switch conduction angle to solve the cascade multilevel inverter is regarded as the research subject in this study. The voltage on the power switches of a cascade multilevel inverter could be applied to high-power environments. Nevertheless, it is necessary to use the modulation strategy to have the output waveform approach sine waves, where the harmonic optimization staircase waveform strategy in step modulation could reduce the switching frequency. However, nonlinear equations need to be solved for calculating the optimal switch conduction angl
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36

Luo, Shih-Chung, and 羅世崇. "Estimating Total-Harmonic-Distortion of Analog Signal in Time-Domain." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/54418096252022565708.

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碩士<br>國立雲林科技大學<br>電子與光電工程研究所碩士班<br>100<br>In this work, we propose a methodology to estimate Total-Harmonic-Distortion (THD) in time domain. Instead of using Fast-Fourier-Transform (FFT), we express the signal under test into Taylor expansion and derive the relationship between coefficients of Taylor series and composition of harmonic. Furthermore, through analyzing syndromes on signal under test with respect to coefficients of Taylor series and extracting effective information, we calculate these coefficients and translate into harmonic distortion by Parseval’s theorem. The required instrumen
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Weng, Kun-Yao, and 翁崐耀. "Improvement of Total Harmonic Distortion of Elliptical Microspeakers using Speaker Nonlinearities." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/90154499473935167658.

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碩士<br>逢甲大學<br>電聲碩士學位學程<br>98<br>Electrodynamic (moving-coil) transducer such as loudspeaker is subjected to distortion during performance mainly due to nonlinearities. Major nonlinearities are motor and suspension nonlinearities, Bl(x) and Km(x), respectively, which are displacement dependent. Force factor Bl(x) and mechanical suspension stiffness Km(x) nonlinearities are investigated in this thesis for elliptical loudspeaker with various magnetic circuits and track patterns. Analytical modeling and finite element method (FEM) are used to investigate these nonlinearities. For Bl(x) nonlinearit
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38

Brolund, Andreas. "Evaluation of power quality and common design concept for AC-DC converters in aircraft." Thesis, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-337969.

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This master thesis has been carried out in collaboration with Saab, Avionics Systems in Jönköping, Sweden, during the spring of 2017. The thesis investigates unidirectional rectifier topologies in aircraft and the focus has been on evaluating the power quality requirements according to the aircraft standards, in the course of the More Electric Aircraft concept. Both passive and active power factor correction topologies are considered, discussed and compared. Simulation models are designed in MATLAB/Simulink and the procedures are presented. A modular concept regarding components is discussed
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Chen, Yong-Han, and 陳泳翰. "Analysis of Power Factor and Total Harmonic Distortion of Single-Phase Full-Wave Rectifier." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/53778025064598490584.

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碩士<br>崑山科技大學<br>電機工程研究所<br>101<br>Most electronic circuits and devices need the supply of direct current source. However, generally, the energy transmitted by electric power companies to users is alternating current（as far as Taiwan region is concerned, that is AC 110V/ 60Hz）. So, according to circuit demand, most users have to get suitable voltage supply through the step-down and boost of transformer.Through the transition of transformer, actually, alternating current has to pass two steps of rectifier and filter, then users can get direct current source. The thes
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Yang, Chih-Hsiang, and 楊智翔. "Comparing Total Harmonic Distortion for Cascade Multilevel Active front-end Converters with Low Carrier Ratio." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/he4c5x.

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碩士<br>中華大學<br>電機工程學系<br>104<br>Active Front End converter (AFE) having a controllable DC voltage, controllable power factor, bidirectional power flow control and low harmonic distortion of the phase current, it can achieve requirements of IEEE 519- 1992, IEC 6100-3-2 and other industry specifications to avoid voltage and current drops leaving the power quality when the power system contain non-linear loads. The architecture of multi-level inverter reduce the total harmonic distortion for achieve a higher quality of the power system effectively. So the architecture has gradually replace the tra
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KUMAR, HEMANT. "MITIGATION OF T.H.D OF MICRO CONTROLLER BASED THREE PHASE VOLTAGE SOURCE INVERTER." Thesis, 2019. http://dspace.dtu.ac.in:8080/jspui/handle/repository/17054.

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The use of power electronic devices plays a crucial role in control and transformation of electrical power.These devices are non-linear which takes enough space in all the regions of Power electronic converters. Inverter plays important role in industrial and domestic- applications for converting the direct current(DC) power into an alternating current(AC) power. Use of these controlled switches in inverters is gives a smooth and precise control for the transformation of electric power. But on the other hand, usage of these controlled switches results in the high level of Total Harmonic Disto
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42

Zhou, Hua. "Harmonic current control in a high-power current source rectifier system." Master's thesis, 2011. http://hdl.handle.net/10048/1702.

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Line current distortion is an important issue to a high-power current source rectifier(CSR) system. There are two main challenges related to this issue. First, the CSR input LC resonance can be affected by the variation of the source inductance from the power system and the effects of the CSR DC side circuit, which may lead to a line current distortion higher than expected. Another challenge is that the traditional high-power CSR using Selective Harmonic Elimination (SHE) pulse-width modulation (PWM) technique attempts to eliminate certain harmonics in the PWM current, which limits its ability
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43

蔡仁杰. "High Efficiency and Low Total Harmonic Distortion Power Factor Correction Controllers with Automatic Loading Detection and Perturbation On-time Techniques." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/89786690166223606347.

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博士<br>國立交通大學<br>電控工程研究所<br>100<br>The power factor correction (PFC) controller is more popular in today’s green power mainstream for improving power utilization efficiency. The power factor correction shapes the input current of off-line power supplies to increase the real power available from the AC source. First, the proposed perturbation on-time (POT) technique suppresses total harmonic distortion (THD) and thus improves the power factor (PF) in the power factor correction (PFC) controller. Besides, the adaptive controls of the minimum off-time by the proposed inhibit time (IT) control
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44

Yang, Jen-Hua, and 楊仁華. "Design and Implementation of an Active LED Driver Scheme with High Power Factor and Extra-Low Total Harmonic Distortion of Input Current." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/yyh3a7.

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碩士<br>中原大學<br>電機工程研究所<br>102<br>In this thesis, a scheme with high power factor and extra-low total harmonic distortion of input current is implemented in AC-DC LED driver based on Primary Side Regulation (PSR). It achieves the performance of high Power Factor (PF) and extra-low Total Harmonic Distortion of Input current (THDi), and operates in Boundary Conduction Mode (BCM). We adopt the structure of the improved PSR converter scheme by using SD6800 to implement the design. How to improve PF and THDi will be described. The analysis and design of our SD6800 application circuit are explained h
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Uddin, S. M. Muslem. "Advanced Model Predictive Control for AC drives with common mode voltage mitigation." Thesis, 2021. http://hdl.handle.net/1959.13/1430649.

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Research Doctorate - Doctor of Philosophy (PhD)<br>Model Predictive Control (MPC) is a popular control strategy studied in many research publications. Moreover, its acceptance by industry is slow. This thesis identifies a class of AC application, which can significantly benefit from MPC paradigm. Thus, is high performance AC drives operating in industrial environments where common mode voltage (CMV) is a critical aspect. After critical analysis of the existing MPC-based approaches, the thesis proposes a new and advanced MPC scheme called Feedback Quantization Model Predictive Control (FBQ-MPC)
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Dewani, Rahul. "Investigations on Polygonal Voltage Space Vector Structure generation with lower order harmonic suppression using switched capacitive filter throughout modulation range for Drive Applications." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5693.

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Multilevel inverters (MLI) are widely used in a host of industrial applications ranging from renewable energy systems, to electric vehicles, to distributed generation. Due to the switching nature of the output voltage, MLI generate harmonics in output voltage at switching frequency. The harmonics in output voltage generate harmonic currents in the load, which may lead to losses in the system, and may also cause torque pulsations for motor drive applications. Hence, it is necessary to improve the harmonic performance (Total Harmonic Distortion-THD) of the output voltage. To improve the THD of t
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Παπανικολάου, Κωνσταντίνα. "Επίδραση κατανεμημένων παραγωγών στη λειτουργία συστήματος ηλεκτρικής ενέργειας". Thesis, 2014. http://hdl.handle.net/10889/8420.

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Στην παρούσα διπλωματική εργασία πραγματοποιείται μελέτη της επίδρασης ενός συστήματος διασύνδεσης ανεμογεννήτριας με το δίκτυο μέσης τάσης, όσον αφορά την έγχυση αρμονικών από την ανεμογεννήτρια προς το δίκτυο. Η μελέτη περιλαμβάνει τη μοντελοποίηση κάθε τμήματος ενός δικτύου μέσης τάσης με πραγματικά στοιχεία που πάρθηκαν από τη ΔΕΗ. Επιπλέον, μοντελοποιείται μια ανεμογεννήτρια τύπου σύγχρονης μόνιμων μαγνητών, καθώς και όλοι οι ηλεκτρονικοί μετατροπείς ισχύος που απαιτούνται για τη διασύνδεση αυτής με το δίκτυο μέσης τάσης. Όλα τα επιμέρους μοντέλα διασυνδέονται μεταξύ τους ώστε να αποτελέσ
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