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Dissertations / Theses on the topic 'Active inverter'

Author: Grafiati

Published: 3 June 2025

Last updated: 1 August 2025

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1

Butcher, Nicholas David. "Active Paralleling of High Power Voltage Source Inverters." Thesis, University of Canterbury. Electrical and Computer, 2007. http://hdl.handle.net/10092/3430.

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Power electronics are becoming established in ever broadening areas of industry. The transition from previous generation technology is driven by the oportunity for improvements in controllability, efficiency, and longevity. A wide variety of power semiconductors are available, however power handling capacity is still a significant limitation for many applications. An increase in the capacity of a single device is usually accompanied by a drop in switching frequency, and hence achievable system bandwidth. Increased capacity can be attained without this loss in bandwidth by using multiple lower

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2

Massoud, Ahmed Mohammed. "Application of the cascaded multilevel inverter as a shunt active power filter." Thesis, Heriot-Watt University, 2004. http://hdl.handle.net/10399/321.

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3

Lee, Bong-ha. "Active power system compensator with fuzzy vector controller." Thesis, Queensland University of Technology, 2002. https://eprints.qut.edu.au/36152/1/36152_Lee_2002.pdf.

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Active power compensation of reactive power and harmonic distortion caused by non-linear loads can be achieved by using a current controlled, voltage-source inverter based compensator. The compensation technique used injected waveform control along with vector control based on instantaneous power theory allows a general purpose inverter based compensator to perform full compensation of var, power factor and harmonic distortion and other non-linear components. Dr. Keith Hoffman has developed an instantaneous control algorithm capable of eliminating harmonics and calculating the in-phase fund

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4

Leslie, Leonard Gene Jr. "Design and Analysis of a Grid Connected Photovoltaic Generation System with Active Filtering Function." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/31543.

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In recent years there has been a growing interest in moving away from large centralized power generation toward distributed energy resources. Solar energy generation presents several benefits for use as a distributed energy resource, especially as a peaking power source. One drawback of solar energy sources is the need for energy storage for the system to be utilized for a significant percentage of the day. One way of avoiding adding energy storage to a solar generation system while still maintaining high system utilization is to design the power conversion subsystem to also provide harmoni

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5

Waite, Michael James. "Active power filter for unbalanced distribution networks using a flying-capacitor multi-level inverter." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.549738.

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Widespread growth of the consumer electronics market and the upward trend in harnessing electrical power from renewable sources has increased the number of power electronic converters connected to utility distribution systems. Power electronic converters offer flexibility in voltage and current control as well as improved energy efficiency, but generate harmonic currents which have detrimental effects on the power system. A particular challenge appears in 4-wire networks where zero-sequence harmonics exist; such currents accumulate in the neutral conductor and pose threats of overheating and f

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6

Arman, Mahmoud Fayez. "An 'active' passive-filter topology for low power DC/AC inverters." Thesis, Brunel University, 2011. http://bura.brunel.ac.uk/handle/2438/6072.

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This thesis presents a new output passive filter for voltage source inverter applications which is based on a shunt connected single tuned filter topology. The proposed circuit has the advantage of tracing harmonic components wherever its location in the frequency spectrum. The change in the harmonic location might be as a result of a change in the inverter operating frequency. Also, the proposed filter achieves harmonic reduction close to the traditional single tuned passive filter. In order to show the superiority of the proposed model, a comparison is introduced with other self tuning harmo

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7

Zhang, Huibin. "Application of multilevel inverter as shunt active power filter in three-phase three-wire power system." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501797.

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This research investigates application issues of the active power filter to three-phase three-wire systems, with unbalanced, distorted loads where the line impedance gives rise to voltage distortion at the point of common coupling. Five shunt active power filters are investigated: two-level, wye connected cascaded three and five level, and diode-clamped three and five level. Capabilities of the different shunt active power filter topologies to mitigate voltage/current distortion, compensate reactive power, and balance real power from the source are investigated. Results indicate that neutral p

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8

Bottrell, Nathaniel. "Small-signal analysis of active loads and large-signal analysis of faults in inverter interfaced microgrid applications." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/24658.

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Rectifiers and voltage regulators that have characteristics of constant power loads may form a significant percentage of a microgrid's total loads. The real part of the input impedance of a constant power load is negative and it may have control loop dynamics in a similar frequency range to the inverters that are supplying the microgrid. This thesis examines the interactions between an active constant power load and a microgrid for the impact on stability. Participation analysis of the eigenvalues that result from the model of the combined microgrid and active load identified that the low-freq

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Lovgren, Nicholas Keith. "Energy Harvesting From Exercise Machines: Forward Converters with a Central Inverter." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/520.

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This thesis presents an active clamp forward converter for use in the Energy Harvesting From Exercise Machines project. Ideally, this converter will find use as the centerpiece in a process that links elliptical trainers to the California grid. This active clamp forward converter boasts a 14V-60V input voltage range and 150W power rating, which closely match the output voltage and power levels from the elliptical trainer. The isolated topology outputs 51V, higher than previous, non-isolated attempts, which allows the elliptical trainers to interact with a central grid-tied inverter instead

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10

Ingram, David. "An Evaluation of Harmonic Isolation Techniques for Three Phase Active Filtering." Thesis, University of Canterbury. Electrical and Computer Engineering, 1998. http://hdl.handle.net/10092/1260.

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Recent advances in power electronics have lead to the wide spread adoption of advanced power supplies and energy efficient devices. This has lead to increased levels of harmonic currents in power systems, degrading the performance of electrical machinery and interfering with telecommunication services. Active filters provide a solution to these problems by compensating for the distorted currents drawn by non-linear loads. Optimal methods for controlling these active filters have been determined by computer simulation and experimental implementation. Methods used for isolating the harmonic cont

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11

Ozkaya, Hasan. "Parallel Active Filter Design, Control, And Implementation." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608438/index.pdf.

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The parallel active filter (PAF) is the modern solution for harmonic current mitigation and reactive power compensation of nonlinear loads. This thesis is dedicated to detailed analysis, design, control, and implementation of a PAF for a 3- phase 3-wire rectifier load. Specifically, the current regulator and switching ripple filter (SRF) are thoroughly investigated. A novel discrete time hysteresis current regulator with multi-rate current sampling and flexible PWM output, DHCR3, is proposed. DHCR3 exhibits a high bandwidth while limiting the maximum switching frequency for thermal stability a

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12

Rosero, Chandi Carlos Xavier. "Active power sharing and frequency regulation in inverter-based islanded microgrids subject to clock drifts, damage in power links and loss of communications." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/668863.

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Microgrids (MGs) are small-scale power systems containing storage elements, loads and distributed generators that are interfaced with the electric network via power electronic inverters. When an MG is in islanded mode, its dynamics are no longer dominated by the main grid. Then, inverters, driven by digital processors that may exchange data over digital communication, must act as voltage source inverters (VSIs) to take coordinated actions to ensure power quality and supply. The scope of this thesis is bounded to control strategies for active power sharing and frequency regulation in islan

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13

Fuchs, Heinrich Daniel. "Development and implementation of a 1.5 MW inverter and active power filter system for the injection of regenerated energy in a Spoornet traction substation." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/1751.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2005.<br>Spoornet is one of South-Africa’s largest railway companies. It is very important to operate the railway system as cost effectively as possible. A large portion of the railway operates from 3 kV DC traction supplies. One method of cost saving is to utilise the regenerative braking mechanism of the electric trains.

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14

Park, Sung Yeul. "A Wide Range and Precise Active and Reactive Power Flow Controller for Fuel Cell Power Conditioning Systems." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/28645.

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This dissertation aims to present a detailed analysis of the grid voltage disturbance in frequency domain for the current control design in the grid-tie inverter applications and to propose current control techniques in order to minimize its impact and maximize feasibility of the power conditioning system in distributed generations. Because the grid voltage is constantly changing, the inverter must be able to response to it. If the inverter is unable to respond properly, then the grid voltage power comes back to the system and damages the fuel cell power conditioning systems. A closed-loop dy

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15

Danilovic, Milisav. "Active Source Management to Maintain High Efficiency in Resonant Conversion over Wide Load Range." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/76618.

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High-frequency and large amplitude current is a driving requirement for applications such as induction heating, wireless power transfer, power amplifier for magnetic resonant imaging, electronic ballasts, and ozone generators. Voltage-fed resonant inverters are normally employed, however, current-fed (CF) resonant inverters are a competitive alternative when the quality factor of the load is significantly high. The input current of a CF resonant inverter is considerably smaller than the output current, which benefits efficiency. A simple, parallel resonant tank is sufficient to create a high-p

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16

Wahid, Ferdus. "Analysis Of A Wave Power System With Passive And Active Rectification." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-425722.

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Wave energy converter (WEC) harnesses energy from the ocean to produce electrical power. The electrical power produced by the WEC is fluctuating and is not maximized as well, due to the varying ocean conditions. As a consequence, without any intermediate power conversion stage, the output power from the WEC can not be fed into the grid. To feed WEC output power into the grid, a two-stage power conversion topology is used, where the WEC output power is first converted into DCpower through rectification, and then a DC-AC converter (inverter) is used to supply AC power into the grid. The main mot

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17

Affonso, Alex Antonio. "Estudo, modelagem e simulação de um inversor de comutação suave para aplicação em filtros ativos de potência monofásicos." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-17092007-152034/.

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Este trabalho tem como principal objetivo apresentar um estudo, uma modelagem e uma simulação de um inversor de comutação suave para aplicação em um filtro ativo para instalações de baixa e média potência. Inicialmente apresenta uma revisão bibliográfica sobre inversores de comutação suave, onde os mesmos são classificados em função do local onde o circuito auxiliar de comutação suave está inserido, gerando três classificações básicas: comutação de linha, comutação de carga e comutação de chave. Três processos de comutação suave são apresentados: comutação em zero de tensão, comutação em zero

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18

Demirkutlu, Eyyup. "Output Voltage Control Of A Four-leg Inverter Based Three-phase Ups By Means Of Stationary Frame Resonant Filter Banks." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608151/index.pdf.

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A method for high performance output voltage control of a four-leg inverter based three-phase transformerless UPS is proposed. Voltage control loop is employed and the method employs stationary frame resonant filter controllers for the fundamental and harmonic frequency components. A capacitor current feedback loop provides active damping and enhances the output voltage dynamic performance. The controller design and implementation details are given. Linear and nonlinear loads for balanced and unbalanced load operating conditions are considered. The steadystate and dynamic performance of the UP

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19

Senturk, Osman Selcuk. "Series Active Filter Design, Control, And Implementation With A Novel Load Voltage Harmonic Extraction Method." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608819/index.pdf.

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Series Active Filters (SAF) are designed for harmonic isolation and load voltage regulation of single-phase and three-phase voltage harmonic source type nonlinear loads. The novel Absolute Value Method (AVM) for load voltage harmonic extraction is proposed and applied in the control algorithm of SAF. The SAF compensated systems are represented by simplified linear models such that SAF controller gains can be easily determined. Harmonic isolation and load voltage regulation performances of 2.5 kW single-phase and 10 kW three-phase SAF compensated systems are evaluated by detailed simulations. L

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20

Alves, Marcos Gutierrez [UNESP]. "Sistema de geração distribuída fotovoltaica com acumulação, controle da injeção de potências ativa e reativa, com capacidade de operação conectada e ilhada." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151952.

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Submitted by MARCOS GUTIERREZ ALVES null (mmarkos.alves@gmail.com) on 2017-10-18T17:25:15Z No. of bitstreams: 1 Marcos Gutierrez Alves - Tese.pdf: 10359243 bytes, checksum: 24da24ccb395d0581201cc49607f4bf6 (MD5)<br>Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-10-23T18:18:25Z (GMT) No. of bitstreams: 1 alves_mg_dr_ilha.pdf: 10359243 bytes, checksum: 24da24ccb395d0581201cc49607f4bf6 (MD5)<br>Made available in DSpace on 2017-10-23T18:18:25Z (GMT). No. of bitstreams: 1 alves_mg_dr_ilha.pdf: 10359243 bytes, checksum: 24da24ccb395d0581201cc49607f4bf6 (MD5) P

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Alves, Marcos Gutierrez. "Sistema de geração distribuída fotovoltaica com acumulação, controle da injeção de potências ativa e reativa, com capacidade de operação conectada e ilhada /." Ilha Solteira, 2017. http://hdl.handle.net/11449/151952.

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Orientador: Carlos Alberto Canesin<br>Resumo: Frente aos novos desafios impostos ao cenário energético mundial, esta tese de doutorado implementa e analisa uma micro-rede de geração distribuída (GD), com acumulação e capacidade de operação conectada ou desconectada da rede de distribuição de energia elétrica (RDEE). A energia é fornecida à RDEE através de seis inversores monofásicos, constituindo uma rede trifásica, sendo três deles com capacidade de operação ilhada e conectada, e outros três com características de fonte de corrente que podem injetar energia de forma controlada, ativa ou reati

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22

Tomášková, Veronika. "Design svařovacího aparátu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229794.

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This diploma thesis deals with the development of multifunction welding machine for manual metal arc welding MMA and metal inert/active gas welding MIG/MAG. The goal of this work was to design compactly shaped welding inverter considering ergonomics and technological aspects. The thesis is divided into two parts. First part contains historical progress of arc welding, basic principles of chosen methods and view on contemporary market with welding machines. The second part deals with the development of the design, analysis and options of the final proposal.

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Pena, José Carlos Ugaz [UNESP]. "Controle robusto de inversores VSI com filtro LCL aplicados a geração distribuída, com controle da injeção de potências ativa e reativa na rede de distribuição em baixa tensão e capacidade de operação ilhada em ambiente de microrredes." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/139503.

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Submitted by JOSÉ CARLOS UGAZ PEÑA null (josecarlos84@gmail.com) on 2016-06-20T13:29:30Z No. of bitstreams: 1 Tese_JoseCarlosPena_PPGEE.pdf: 9650212 bytes, checksum: 77b105d009c0b473cbc424e681ebe9a5 (MD5)<br>Approved for entry into archive by Ana Paula Grisoto (grisotoana@reitoria.unesp.br) on 2016-06-22T13:10:00Z (GMT) No. of bitstreams: 1 pena_jcu_dr_ilha.pdf: 9650212 bytes, checksum: 77b105d009c0b473cbc424e681ebe9a5 (MD5)<br>Made available in DSpace on 2016-06-22T13:10:00Z (GMT). No. of bitstreams: 1 pena_jcu_dr_ilha.pdf: 9650212 bytes, checksum: 77b105d009c0b473cbc424e681ebe9a5 (MD5)

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Pena, José Carlos Ugaz. "Controle robusto de inversores VSI com filtro LCL aplicados a geração distribuída, com controle da injeção de potências ativa e reativa na rede de distribuição em baixa tensão e capacidade de operação ilhada em ambiente de microrredes /." Ilha Solteira, 2016. http://hdl.handle.net/11449/139503.

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Orientador: Carlos Alberto Canesin<br>Resumo: Os inversores fonte de tensão com filtro de saída LCL (VSI+LCL) são amplamente utilizados em sistemas de geração distribuída. Nestas aplicações o sistema é controlado como uma fonte de corrente, no entanto, há a possibilidade de controlar o conjunto como uma fonte de tensão. Desta forma, a mencionada configuração pode ser utilizada em geração distribuída no ambiente de microrredes onde os sistemas, monofásicos ou trifásicos, devem operar conectados à rede de distribuição elétrica com controle das potências injetadas (ativa e reativa) e serem capaze

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25

Pimentel, Sergio Pires. "Aplicação de inversor multinivel como filtro ativo de potencia." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259300.

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Orientador: Jose Antenor Pomilio<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e Computação<br>Made available in DSpace on 2018-08-07T03:19:29Z (GMT). No. of bitstreams: 1 Pimentel_SergioPires_M.pdf: 2753814 bytes, checksum: 4e94e3c8b75144bb509d505233b11dcb (MD5) Previous issue date: 2006<br>Resumo: Este trabalho aborda a implementação de um filtro ativo de potência utilizando um inversor multinível com topologia em cascata assimétrica. Justificativas para utilização de estruturas multiníveis são discutidas. O sistema de controle utilizado g

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26

Zhang, Yu. "Small-Signal Modeling and Analysis of Parallel-Connected Power Converter Systems for Distributed Energy Resources." Scholarly Repository, 2011. http://scholarlyrepository.miami.edu/oa_dissertations/551.

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Alternative energy resources (such as photovoltaics, fuel cells, wind turbines, micro-turbines, and internal combustion engines) and energy storage systems (such as batteries, supercapacitors, and flywheels) are increasingly being connected to the utility grid, creating distributed energy resources which require the implementation of an effective distributed power management strategy. Parallel-connected power converters form a critical component in such a distributed energy resources system. This dissertation addresses small-signal modeling and analysis of parallel-connected power converter sy

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Badran, Ahmad. "Integrating Wind Power into The Electric Grid : Predictive Current Control Implementation." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-99640.

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The increasing penetration of wind power into the power system dominated by variable-speed wind turbines among the installed wind turbines will require further development of control methods. Power electronic converters are widely used to improve power quality in conjunction with the integration of variable speed wind turbines into the grid. In this thesis, a detailed model of the Predictive Current Control (PCC) method will be descripts for the purpose of control of the grid-connected converter. The injected active and reactive power to the grid will be controlled to track their reference val

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28

Marzouk, Mounir. "Développement de chargeurs intégrés pour véhicules hybrides plug-in." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT088/document.

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Ces travaux de thèse consistent en la conception et la réalisation d’une chaîne de tractionintégrée pour véhicule hybride plug-in. L’étude s’oriente vers une solution de convertisseur mutualisé,dans l’objectif de partager la traction et les modes chargeurs de batteries, la structure en NPC à 3niveaux est retenue. Le chargeur monophasé se base une topologie de redresseur à MLI monophaséavec trois bras entrelacés, avec l’utilisation des enroulements du moteur pour le filtrage. En chargeurtriphasé nous adaptons la topologie pour réaliser un montage en double boost triphasé. Pour chaqueconfigurati

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29

Cetinkaya, Suleyman. "Repetitive Control Of A Three-phase Uninterruptible Power Supply With Isolation Transformer." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608150/index.pdf.

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A repetitive control method for output voltage control of a three phase uninterruptible power supply (UPS) with isolation transformer is investigated. In the method voltage control loop is employed in the stationary dq frame. The controller eliminates the periodic errors on the output voltages due to inverter voltage nonlinearity and load disturbances. The controller design and implementation details are given. The controller is implemented on a 5-kVA UPS prototype which is constructed in laboratory. Linear and nonlinear loads for balanced and unbalanced load operating conditions are considere

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Koton, Jaroslav. "Syntéza a analýza obvodů s moderními aktivními prvky." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-233476.

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The dissertation thesis deals with the synthesis and design of active frequency filters using current (CC) and voltage (VC) conveyors, or current active elements CMI (Current Mirror and Inverter), MCMI (Multi-output CMI) and PCA (Programmable Current Amplifier). As introduction, these active elements are described as suitable for the design of the circuits working in the voltage-, current,- ,and mixed-mode, or in pure current-mode speaking about the current active elements. The new frequency filter structures presented in this thesis using the above mentioned active elements were designed by t

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Ramsey, W. T. "On single-amplifier immittance inverters and their use in active filter design." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37826.

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Atmoko, Hidajat. "Development of active control systems for controlling environmental noise." Thesis, University of Huddersfield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247466.

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Karania, Nabil. "Contrôle du Compensateur Actif Parallèle à Génération Photovoltaïque pour les Réseaux Intelligents." Electronic Thesis or Diss., CY Cergy Paris Université, 2024. http://www.theses.fr/2024CYUN1288.

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Dans les réseaux de distribution électrique et les réseaux intelligents, l'adoption généralisée des composants électroniques de puissance pose divers défis en matière de qualité de l'énergie. L'intégration des sources d'énergie renouvelable aggrave ces défis en raison des fluctuations de tension, des écarts de fréquence et de la distorsion des formes d'onde inhérents à ces sources, dont les performances dépendent des conditions météorologiques. Cette thèse aborde ces défis à travers trois solutions visant à améliorer la qualité de l'énergie électrique dans les réseaux de distribution, en se fo

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Yang, Lixin. "An Investigation of the Semantics of Active and Inverse Systems." Thesis, University of North Texas, 1992. https://digital.library.unt.edu/ark:/67531/metadc278562/.

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This study surveys pronominal reference marking in active and inverse languages. Active and inverse languages have in common that they distinguish two sets of reference marking, which are referred to as Actor and Undergoer. The choice of one series of marking over another is shown to be semantically and pragmatically determined.

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Escolle, Clément. "Optique active spatiale pour l'observation à haute résolution." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4767/document.

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Pour relever les défis de l'observation de la Terre et de l'astronomie, les futurs observatoires spatiaux vont requérir des télescopes de plusieurs mètres de diamètre. Les différentes contraintes liées à l'environnement spatial vont induire des déformations et des désalignements des miroirs du télescope dégradant ainsi la qualité optique des observations. L'intégration de l'optique active, utilisée depuis la fin des années 80 pour l'alignement et le maintien de la qualité optique des télescopes au sol, devient donc nécessaire. Un tel système est constitué de trois éléments : un dispositif de m

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Boora, Arash Abbasalizadeh. "Flexible high-power multi DC-DC converters for train systems." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/33208/1/Arash_Boora_Thesis.pdf.

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This thesis reports on the investigations, simulations and analyses of novel power electronics topologies and control strategies. The research is financed by an Australian Research Council (ARC) Linkage (07-09) grant. Therefore, in addition to developing original research and contributing to the available knowledge of power electronics, it also contributes to the design of a DC-DC converter for specific application to the auxiliary power supply in electric trains. Specifically, in this regard, it contributes to the design of a 7.5 kW DC-DC converter for the industrial partner (Schaffler and As

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Mikuška, Martin. "Střídač pro trojfázový motor." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220710.

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This master’s thesis goes into design of particular circuits for three phase inverter. Inverter’s control is ensured by digital signal controller MC56F8013 with his program. Principle of control is suggested for individual motors. Inverter design considerate universal use and capability for any three phase motor. Particular blocks are compatible each other.

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Slagel, Joseph Tanner. "Row-Action Methods for Massive Inverse Problems." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/90377.

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Numerous scientific applications have seen the rise of massive inverse problems, where there are too much data to implement an all-at-once strategy to compute a solution. Additionally, tools for regularizing ill-posed inverse problems are infeasible when the problem is too large. This thesis focuses on the development of row-action methods, which can be used to iteratively solve inverse problems when it is not possible to access the entire data-set or forward model simultaneously. We investigate these techniques for linear inverse problems and for separable, nonlinear inverse problems where th

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Xu, Ji. "Active Control of Vehicle Powertrain Noise using Adaptive Notch Filter with Inverse Model LMS Algorithm." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1447689357.

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Reader, Daniel Martin. "Nonlinear Mr Model Inversion for Semi-Active Control Enhancement With Open-Loop Force Compensation." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/32660.

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The increased prevalence of semi-active control systems is largely due to the emergence of cost effective commercially available controllable damper technology such as Magneto-Rheological (MR) devices. Unfortunately, MR dampers exhibit highly nonlinear behavior, thus presenting an often over-looked complexity to the control system designer. With regards to controlling dampers, the well-known Skyhook Damping control algorithm has enjoyed great success for both fully active and semi-active control problems. The Skyhook design strategy is to create a control force that emulates what a passive

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Boulier, Thomas. "Modélisation de l'électro-localisation active chez les poissons faiblement électriques." Palaiseau, Ecole polytechnique, 2013. http://www.theses.fr/2013EPXX0108.

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Leclercq, Jean François. "Imagerie microonde active pour applications biomédicales : systèmes 2D et 3D monochromatiques." Paris 11, 1985. http://www.theses.fr/1985PA112285.

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Cette thèse présente une étude de systèmes d'imagerie microonde active, fondés sur la méthode de tomographies par diffraction. Cette forme d'imagerie a pour but d'obtenir des renseignements complémentaires aux autres systèmes d'imagerie existant par ailleurs, en particulier sur les caractéristiques diélectriques des corps, et sur tout facteur physique infuençant ceux-ci comme par exemple la température. Le principe en est le suivant l'objet sous investigation est illuminé par une onde plane centimétrique, ce qui crée à l'intérieur de l'objet des courants équivalents induits, qui vont à leur to

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Kauffmann, Bruno. "Problèmes inverses dans les réseaux." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2011. http://tel.archives-ouvertes.fr/tel-00824860.

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La croissance récente d'Internet lors deux dernières décennies a conduit à un besoin croissant de techniques permettant de mesurer la structure et la performance d'Internet. Les techniques de mesures de réseaux peuvent être classifiées en méthodes passives qui utilisent des données collectées au niveau des routeurs, et les méthodes actives, reposant sur l'injection active et l'observation de paquets-sondes. Les méthodes actives, qui sont la motivation principale de ce doctorat, sont particulièrement adaptées aux utilisateurs finaux, qui ne peuvent pas accéder aux données mesurées par les route

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Lomneth, Theresa K. "Teaching an Old Profession New Tricks: An Analysis on the Effects of the Flipped Classroom Model on Student Performance." Scholarship @ Claremont, 2014. http://scholarship.claremont.edu/cmc_theses/931.

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Abstract When traditional lecture methods prove ineffective, some professors turn to alternative teaching styles. In particular, a flipped or inverted classroom, where students watch conceptual videos before coming to class and use class time for application and fine tuning of these concepts has become popular in recent years. However, little consensus exists on the efficacy of these strategies. The purpose of this study is to determine whether a flipped classroom structure implemented in a medical school course successfully improved student performance. To do so, I analyzed exam data from the

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Liu, Yu-Sheng, and 劉育昇. "Design and Implementation of Active Clamp Forward Inverter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/48058302709863460831.

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碩士<br>清雲科技大學<br>電機工程所<br>100<br>The aim of this thesis is to develop a small scale DC-AC inverter based on active clamp forward topology for either stand-alone or grid-connected applications. The proposed inverter is characterized by a single stage structure in which active clamp forward conversion is adopted on the DC side and a full bridge inversion associated with LC filter is applied on the AC side. While the forward conversion part is operated at M-type high frequency sinusoidal pulse width modulation, the full bridge inversion part is switched at utility frequency. A step-up transformer

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Tzung-ShianTsai and 蔡宗憲. "Study on Active Power Filter for Grid-Connected Inverter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/79435243837572442206.

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碩士<br>國立成功大學<br>電機工程學系<br>102<br>The purpose of this thesis is to implement the active power filter which can correct the output current of the grid-connected inverter. In order to mitigate the distortion and improve the efficiency of power transmission, the current fed to the grid should be corrected into a sinusoidal waveform. The circuit of the active power filter is using single phase full-bridge structure. The distortion component of current will be detected by the designed control system to obtain the compensation current command. The current closed-loop control scheme includes PI-contro

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Wu, Yan-Ting, and 吳彥霆. "Research and Implementation of an Active-Clamp Forward Inverter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/en39rp.

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碩士<br>義守大學<br>電機工程學系<br>107<br>This thesis proposes an active-clamp forward inverter. The proposed inverter is developed with an active-clamp forward dc-dc converter, and then connecting with an H-bridge unfolding circuit to output low-frequency voltage. Because the transformer works in the first and third quadrants, it can reduce the volume of the core and the cost. This inverter solves the limitation of duty ratio and the voltage stress on the main switch by resting the flux of transformer wih the auxiliary switch and the clamp capacitor. The zero voltage switching (ZVS) is achieved by the r

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Kumari, Botsa Vasanthi. "Active Power Control of Single Phase Standalone Inverter Systems." Thesis, 2018. http://ethesis.nitrkl.ac.in/9641/1/2018_MT_216EE3292_BVKumari_Active.pdf.

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Continuous and reliable power supply to different connected loads is a challenging and most desirable aspect now a days. Stand-alone mode of operation of inverter system is one of the best ways for getting continuous supply of power.This type of power supply is applicable where distribution of electricity system is not fitted. Forgetting uninterruptable and reliable power supply, proper design of power inverter and a thoroughgoing feedback controller should be needed such that unconcerned about which type of load connected to the inverter, power inverter should be able to produce an

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Prafulla, Mandava Divya. "Power Quality Improvement Using Multilevel Inverter Based Shunt Active Filter." Thesis, 2015. http://ethesis.nitrkl.ac.in/6856/1/POWER_Prafulla_2015.pdf.

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Harmonics have become a major issue in the recent times due to the high usage of power electronic equipment. Harmonics lead to many problems such as overheating of equipment, interference with the near, by communication lines, high power loss, low power factor and hence poor usage of equipment. Shunt active filters are used to compensate these harmonics and draw only fundamental component of current from the supply. The shunt active filters be designed using multilevel inverters are more efficient when compared to the classical inverters due to their step voltage waveform. In this work, multil

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Yeh, Ting-Wei, and 葉庭瑋. "Analysis of Grid-Connected PV Inverter With Active and Reactive Power Control." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/62395338189631846681.

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碩士<br>國立高雄第一科技大學<br>電子工程研究所<br>103<br>This thesis analyzes the common problems of grid-tied photovoltaic (PV) inverter, and mainly consists of three segments, double-line-frequency voltage ripples of traditional inverter, output power control of single-phase grid-tied PV inverter, and output power control of three-phase grid-tied PV inverter. The power mismatch between dc input and ac output will cause the PV inverter hard to track the maximum power point (MPP), and decrease the efficiency. To regulate the dc-bus voltage, the output power of single-phase grid-tied PV inverter is controlled by

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