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Dissertations / Theses on the topic 'Medium Voltage DC'

Author: Grafiati
Published: 19 October 2024
Last updated: 19 July 2025

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1

Thomas, Stephan [Verfasser]. "A Medium-Voltage Multi-Level DC/DC Converter with High Voltage Transformation Ratio / Stephan Thomas." Aachen : Shaker, 2014. http://d-nb.info/1049383176/34.

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2

Gowaid, Islam Azmy. "DC-DC converter designs for medium and high voltage direct current systems." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27933.

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DC fault protection is one challenge impeding the development of multi-terminal dc grids. The absence of manufacturing and operational standards has led to many point-to-point HVDC links built at different voltage levels, which creates another challenge. Therefore, the issues of voltage matching and dc fault isolation in high voltage dc systems are undergoing extensive research and are the focus of this thesis. The modular multilevel design of dual active bridge (DAB) converters is analysed in light of state-of-the-art research in the field. The multilevel DAB structure is meant to serve mediu
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3

LA, GANGA ALESSANDRO. "Feasibility study of a Medium Voltage DC/DC Converter adopting WBG devices." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2950484.

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4

Aboushady, Ahmed Adel. "Design, analysis, and modelling of modular medium-voltage DC/DC converter based systems." Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=18685.

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This thesis investigates the design and analysis of modular medium-voltage dc/dc converter based systems. An emerging converter application is feeding offshore oil and gas production systems located in deep waters, on the sea bed, distant from the onshore terminal. The phase-controlled series-parallel resonant converter (SPRC) is selected as the dc/dc converter unit, for a 10kV dc transmission system. The converter has a high efficiency in addition to favourable soft switching characteristics offered by resonant converters which enable high frequency operation, hence designs with reduced footp
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5

Gebreab, Ermias K. "Interfacing of battery with a medium voltage DC-DC converter using MATLAB/Simulink." Kansas State University, 2013. http://hdl.handle.net/2097/15759.

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Master of Science<br>Department of Electrical and Computer Engineering<br>Sanjoy Das<br>Noel Schulz<br>Electrical power, although convenient form of energy to distribute and use, cannot easily be stored in large quantities economically. Most electrical power generated by utility plants is consumed simultaneously in real time. However, in some cases, energy storage systems become crucial when power generated from sources does not fulfill peak power load demand in a power system or energy storage systems are needed as backup. Due to these reasons, various technologies such as batteries, ultraca
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6

Cui, Shenghui [Verfasser], Doncker Rik W. [Akademischer Betreuer] De, and Rainer [Akademischer Betreuer] Marquardt. "Modular multilevel DC-DC converters interconnecting high-voltage and medium-voltage DC grids / Shenghui Cui ; Rik W. de Doncker, Rainer Marquardt." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1195238002/34.

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7

Zhao, Shishuo. "High Frequency Isolated Power Conversion from Medium Voltage AC to Low Voltage DC." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/74969.

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Modern data center power architecture developing trend is analyzed, efficiency improvement method is also discussed. Literature survey of high frequency isolated power conversion system which is also called solid state transformer is given including application, topology, device and magnetic transformer. Then developing trend of this research area is clearly shown following by research target. State of art wide band gap device including silicon carbide (SiC) and gallium nitride (GaN) devices are characterized and compared, final selection is made based on comparison result. Mostly used high f
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8

Bosich, Daniele. "Medium Voltage DC integrated power systems for large all electric ships." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423756.

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The Medium Voltage Direct Current (MVDC) distribution represents a promising technology for future shipboard power systems. In such a topic, during the last years, universities and reserch centers have proposed technical solutions to achieve the important targets of MVDC technology, for instance fuel saving, reducing power system weight/space, reconfigurability in case of fault and enhanced power quality. Conversely, the main challenge to face regards voltage control, which has to be capable for guaranteeing the paramount requirement of stability. In regards to this aspect, a possible instabil
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9

Qi, Qi. "Benefit analysis of using soft DC links in medium voltage distribution networks." Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/114978/.

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Soft DC Links are power electronic converters enabling the control of power flow between distribution feeders or networks. This thesis considers the use of Soft DC Links in Medium Voltage (MV) distribution networks to improve network operation while facilitating the integration of distributed generators (DGs). Soft DC Links include Soft Open Points (SOPs) and Medium Voltage Direct Current (MVDC) links. An SOP can be installed to replace mechanical switchgear in a network, providing controllable active power exchange between connected feeders, as well as reactive power compensation at each inte
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10

Soltau, Nils Verfasser], Doncker Rik W. [Akademischer Betreuer] [De, and Antonello [Akademischer Betreuer] Monti. "High-power medium-voltage DC-DC converters : design, control and demonstration / Nils Soltau ; Rik W. de Doncker, Antonello Monti." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1158599544/34.

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11

Shehada, Ahmed. "Novel Multilevel Converter for Variable-Speed Medium Voltage Switched Reluctance Motor Drives." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/85111.

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A novel multilevel converter that is especially suited for high speed multi-megawatt switched reluctance motor drives operating at the medium voltage level is presented. The drive is capable of variable speed, four-quadrant operation. Each phase leg of the converter contains an arbitrary number of cascaded cells connected in series with the phase winding. Each cell contains a half-bridge chopper connected to a capacitor. The converter is named the cascaded chopper cell converter. The modular nature of the converter with the ability to add redundant cells makes it very reliable, which is a key
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12

Yu, Jianghui. "DC Fault Current Analysis and Control for Modular Multilevel Converters." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/78054.

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Recent research into industrial applications of electric power conversion shows an increase in the use of renewable energy sources and an increase in the need for electric power by the loads. The Medium-Voltage DC (MVDC) concept can be an optimal solution. On the other hand, the Modular Multilevel Converter (MMC) is an attractive converter topology choice, as it has advantages such as excellent harmonic performance, distributed energy storage, and near ideal current and voltage scalability. The fault response, on the other hand, is a big challenge for the MVDC distribution systems and the t
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13

Farias, de Barros Heitor. "Planification de réseaux de distribution mixtes AC/DC." Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALT050.

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L'intégration croissante des ressources énergétiques natives en courant continu à l'échelle de réseaux électriques, telles que les systèmes photovoltaïques, les véhicules électriques, les systèmes de stockage et les centres de données, remet en question le choix conventionnel des systèmes de distribution en courant alternatif (AC) au niveau de la moyenne tension (MV). Cette recherche vise à évaluer la viabilité technique et économique des réseaux de distribution MV AC/DC en développant des outils de planification pour les réseaux hybrides.L'étude propose des modèles de planification optimale d
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14

Martin, Jérémy. "Caractérisation en commutation douce d'IGBT 6,5 kV pour l'application transformateur moyenne fréquence en traction ferroviaire." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0037/document.

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Ce travail concerne l’étude et la réalisation d’une architecture multicellulaire de conversion d’énergie électrique haute tension avec étage intermédiaire alternatif moyenne fréquence destinée à la traction électrique ferroviaire. L’objectif de ce travail est de diminuer la masse et le volume de l’étage de conversion alternatif-continu que l’on retrouve dans les engins de traction conçus pour circuler sur les réseaux alternatifs 25kV-50Hz ou 15kV-16Hz2/3. La recherche de gains sur l’étage de conversion alternatif-continu s’applique aussi bien sur les automotrices où l’on cherche à gagner de la
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15

Meier, Stephan. "System Aspects and Modulation Strategies of an HVDC-based Converter System for Wind Farms." Doctoral thesis, Stockholm : Skolan för elektro- och systemteknik, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10267.

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16

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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17

Tsung-HsunLee and 李宗勳. "Implementation of the Three-Level DC-DC Converter Applied in Medium-Voltage Solid-State Transformer." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/pkw867.

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碩士<br>國立成功大學<br>電機工程學系<br>106<br>As the progress of wide-bandgap (WBG) semiconductor devices and the rise of distributed energy resources (DER), medium-voltage solid-state transformer (SST) becomes more and more popular in recent years. Medium-voltage SST features high-performance and fantastic functionality. The SST proposed in this thesis is applied in 11.4 kVAC distribution system, and the DC stage of the SST is composed of 13 modules. Operating principle, steady-state analysis and components design of the converter as well as the parameter design, insulation consideration and loss optimiza
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18

Lang, Lin Kun, and 林坤良. "A Rigid Power Flow Model and Steady-State Characteristic Analysis of Medium Voltage DC Distribution Systems for Marine Vessels." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/54859299248172257709.

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碩士<br>國立高雄海洋科技大學<br>輪機工程研究所<br>99<br>Medium voltage DC (MVDC) electrical distribution system that is a novel technique for sea and undersea vehicles has been extensively studied by ship building corporations and end-users in recent years. In this type of distribution systems, the steady-state stability issue is important because of the presence of different types of power converters and both of AC and DC power supply in the system. Power flow analyses can be carried to address this issue. This thesis aims to build a set of power flow analysis model for ship MVDC distribution systems with diffe
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19

Mahapatra, Manmohan. "Soft Switched Multilevel Unidirectional High Frequency Link DC to AC Converter for Medium Voltage Grid Integration of Solar Photovoltaics." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4675.

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Grounding the frame of photovoltaic (PV) panel is a necessity for the safety of humans. This leads to the formation of large capacitance between PV cells and ground. Hence, to reduce leakage current due to parasitic capacitance between PV cells and ground, the DC output voltage of a photovoltaic panel is normally kept below 1 kV. Conventionally, for medium voltage (3.3 kV-66 kV) AC grid integration of PV panel, the DC output of PV is rst converted to 400V AC and is connected to a 400V collection grid through a line frequency transformer (LFT). This LFT provides isolation and limits circ
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