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Dissertations / Theses on the topic 'Multilevel Voltage Source Converter'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Hawley, Joshua Christiaan. "Modeling and Simulation of a Cascaded Three-Level Converter-Based SSSC." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/10109.

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This thesis is dedicated to a comprehensive study of static series synchronous compensator (SSSC) systems utilizing cascaded-multilevel converters (CMCs). Among flexible AC transmission system (FACTS) controllers, the SSSC has shown feasibility in terms of cost-effectiveness in a wide range of problem-solving abilities from transmission to distribution levels. Referring to the literature reviews, the CMC with separated DC capacitors is clearly the most feasible topology for use as a power converter in the SSSC applications. The control for the CMC-Based SSSC is complicated. The design of the c

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2

Sirisukprasert, Siriroj. "The Modeling and Control of a Cascaded-Multilevel Converter-Based STATCOM." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/11142.

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This dissertation is dedicated to a comprehensive study of static synchronous compensator (STATCOM) systems utilizing cascaded-multilevel converters (CMCs). Among flexible AC transmission system (FACTS) controllers, the STATCOM has shown feasibility in terms of cost-effectiveness in a wide range of problem-solving abilities from transmission to distribution levels. Referring to the literature reviews, the CMC with separated DC capacitors is clearly the most feasible topology for use as a power converter in the STATCOM applications. The controls for the CMC-based STATCOM were, however, very com

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3

Zhang, Yushu. "Multilevel voltage source converters in high voltage direct current transmission systems." Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=25814.

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This research focuses on voltage source multilevel converters in high voltage direct current (HVDC) transmission systems. The first Voltage Source Converter based HVDC (VSC-HVDC) systems with series connected IGBTs in a two-level converter represented a solution to meet industrial and economical requirements but is associated with significant drawbacks such as high dv/dt and di/dt, high switching loss, and poor output voltage and current quality. To overcome these issues, the multilevel converter was proposed for HVDC application. The Modular Multilevel Converter (M2C) was the first multilevel

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4

Zare, Firuz. "Multilevel converter structure and control." Thesis, Queensland University of Technology, 2001. https://eprints.qut.edu.au/36142/7/36142_Digitsed%20Thesis.pdf.

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In recent years, multilevel converters are becoming more popular and attractive than traditional converters in high voltage and high power applications. Multilevel converters are particularly suitable for harmonic reduction in high power applications where semiconductor devices are not able to operate at high switching frequencies or in high voltage applications where multilevel converters reduce the need to connect devices in series to achieve high switch voltage ratings. This thesis investigated two aspects of multilevel converters: structure and control. The first part of this thesis foc

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5

Almaktoof, Ali Mustafa Ali. "Multilevel inverters using finite set- model predictive current control for renewable energy systems applications." Thesis, Cape Peninsula University of Technology, 2015. http://hdl.handle.net/20.500.11838/1202.

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Thesis submitted in fulfilment of the requirements for the degree Doctor of Technology: Electrical Engineering in the Faculty of Engineering at the Cape Peninsula University of Technology<br>This research focuses on the predictive current control of multilevel converters with the aim of providing an optimized system for three-phase, multilevel inverters (MLIs) so that the load current and the voltage of the capacitors can be controlled. A model predictive current control algorithm is proposed, specifically directed at the utilisation of power obtained from renewable energy systems (RESs). The

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6

Paterakis, Fotis Konstantinos. "Development of alternative pulse width modulation methods for conventional and multilevel voltage source inverters." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/13856.

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Multilevel inverters have attracted wide interest in both the academic community and the industry for the past decades. Therefore, the investigation and development of modulation strategies in multilevel inverters emerges as a necessity for the industry and researchers. In this doctoral thesis, alternative modulation methods suitable for three-level conventional single-phase inverters and especially for cascade H-bridge multilevel inverters are discussed and proposed. The theory of Equal Areas is reformed and presented and its modifications are proposed. These modifications are compared with o

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7

Antonopoulos, Antonios. "On the Internal Dynamics and AC-Motor Drive Application of Modular Multilevel Converters." Doctoral thesis, KTH, Elektrisk energiomvandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156200.

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This thesis is an effort to investigate the operation and the performanceof modular multilevel converters (M2Cs). Proven to be the most promisingtopology in high-voltage high-power applications, it is necessary to put aneffort in understanding the physical laws that govern the internal dynamicsof such converters, in order to design appropriate control methods. AlthoughM2Cs belong to the well-studied family of voltage-source converters (VSCs),and claim a modular structure, their control is significantly more complicatedcompared to two- or three-level VSCs, due to the fact that a much highernumb

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8

Ahmadi, Seyedhesam, and Mehrdad Bahmani. "Reglering av effektflöde i HVDC-system genom centraliserad och distribuerad spänningskontroll i realtid." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254267.

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“High voltage direct current” (HVDC) teknologi har blivit allt viktigare teknik för att integrera förnybara energikällor i elnätet. För att styra ett sådant elsystem på bästa möjliga sätt krävs optimala kontrollstatergier både för omvandlarna och nätet. Så syftet med detta projekt är att undersöka hur olika regleringsmetoder, såsom centraliseradoch distribuerad spänningskontroll, kan påverka driften i ett 4-terminal HVDC-system. Ett optimalt effektflöde uppstår i systemet endast när likspänningen inte avviker från sitt börvärde och det uppnås genom att ha aktiv effekt regulator i varje nod i n

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9

Redander, Jessica, and Johanna Lenárd. "Development of a Real-Time Simulation Model in RSCAD of a STATCOM and its Control System." Thesis, Uppsala universitet, Elektricitetslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-447234.

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The development of interconnected power systems together with an increasing number of renewable non-synchronous power sources, create major challenges for the power system to meet the voltage stability and power quality requirements. One way to increase the voltage stability in a sustainable way is to locally implement a STATCOM. By enhancing grid voltage stability under varying network conditions, the active power transfer capability will increase. However, before a STATCOM can be deployed in the power system, the behavior of it needs tobe investigated for the specific network conditions at t

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10

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

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

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11

Krug, Dietmar. "Vergleichende Untersuchungen von Mehrpunkt-Schaltungstopologien mit zentralem Gleichspannungszwischenkreis für Mittelspannungsanwendungen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-216245.

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Die vorliegende Arbeit befasst sich mit einem detaillierten Vergleich von Mehrpunkt-Schaltungstopologien mit zentralem Gleichspannungszwischenkreis für den Einsatz in Mittelspannungsanwendungen. Im Rahmen dieser Untersuchungen wird die 3-Level Neutral Point Clamped Spannungswechselrichter Schaltungstopologie (3L-NPC VSC) sowohl mit Multilevel Flying Capacitor (FLC) als auch mit Multilevel Stacked Multicell (SMC) Schaltungstopologien verglichen, wobei unter Verwendung von aktuell verfügbaren IGBT-Modulen Stromrichterausgangsspannungen von 2.3 kV, 4.16 kV und 6.6 kV betrachtet werden. Neben der

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12

Elgenedy, Mohamed Atef. "High-voltage pulse generators incorporating modular multilevel converter sub-modules." Thesis, University of Strathclyde, 2018. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=29620.

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Recent research established the effectiveness of applying a pulsed electric field to deactivate harmful microorganisms (such as bacteria and E. coli). Successful deactivation is achieved by lethal electroporation; a process that produces electric pores in the biological cell membrane of the harmful microorganisms when subjected to high-voltage (HV) pulses. The HV pulses are designed to create pores beyond a critical size at which the biological cell can reseal. In contrast when applying non-lethal electroporation, the cell-membrane survives after the electroporation process. This is required,

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13

Borisov, Konstantin A. "Multifunctional voltage source converter for shipboard power systems." Diss., Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-06042007-142951.

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14

Kazerani, Mehrdad. "Dyadic matrix converter theory : development, and application to voltage-source-converter type matrix converter." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28794.

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For the past twenty years, the theoretical advance of the matrix converters has been impeded by the complexity arising from the time-varying trigonometric functions in their transformation matrix. In addition, the switching difficulties associated with the bidirectional switches have complicated the practical implementation of this class of converters.<br>In this thesis, the dyadic matrix structure and the a-b-c to d-q-0 transformation have been melded together to develop the dyadic matrix converter theory which is a generalized theory for the three-phase to three-phase matrix converters.<br>T

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15

Amankwah, Emmanuel K. "A parallel hybrid modular multilevel converter for high voltage DC applications." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13845/.

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Reliability and efficiency of power transmission has been at the forefront of research for some time and is currently being given critical consideration due to the increased dependence on electrical energy. With the increased demand for electricity, engineers are considering different methods of supply arrangement to improve the security of electricity supply. High Voltage Direct Current (HVDC) transmission is a technology that avails itself for distance power transmission, interconnection of asynchronous networks and cross sea or offshore power transmission. The main element of an HVDC system

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16

Lu, Bin. "A feedback control algorithm for voltage-source matrix converter." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ37268.pdf.

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17

Lu, Bin 1969. "A feedback control algorithm for voltage-source matrix converter /." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28001.

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One application of the voltage-source, matrix converter is as an asynchronous link, joining two AC power systems with different frequencies (50Hz/60Hz), or at the same frequency (60Hz/60Hz) but at different phase angles. This thesis work shows that for this kind of link, there exists an automatic closed-loop feedback strategy to control the real and reactive powers quickly and independently.<br>In this thesis, the new matrix converter topology, based on the three-phase voltage-source converters, has been used.<br>The thesis mixes the dyadic matrix structure the a-b-c to d-q-o transformation an

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18

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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19

Espinoza, Bolaños Mauricio Antonio. "Control systems for high-power medium-voltage modular multilevel converter-based drives." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/168418.

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Doctor en Ingeniería Eléctrica<br>Hoy en día, la construcción de maquinaria y plantas industriales exigen soluciones de accionamiento con un diseño flexible y escalable. En sectores industriales como la petroquímica, la minería, la generación de energía, etc., existe una demanda de soluciones con alta eficiencia, seguridad integrada y respaldo de las compañías proveedoras. En este contexto, el Convertidor Multinivel Modular (MMC) ha aparecido como una opción prometedora para accionamientos de media tensión de alta potencia debido a sus características, como modularidad total, flexibilidad de c

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20

Martin, Fregelius. "Power electronics and controller interface for a Voltage Source Converter." Thesis, Uppsala universitet, Elektricitetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-322903.

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The purpose of the thesis is to develop a system for a split-rotor drive and evaluatecontrollers and their internal components such as processors, communicationprotocols and execution speed for controlling magnetization currents in a hydropower station.The first part of the thesis builds the theory review and provides an introduction tothe most common processors and controllers available. The processors which wasevaluated were microprocessor, DSP and FPGA which have a high capacity andvariety of implementation possibilities. Two controllers, PLC and PAC whereevaluated, which contain some or se

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21

Džonlaga, Bogdan. "Contribution to the sizing of the modular multilevel converter." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS297/document.

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Le convertisseur multiniveau modulaire (MMC) est une solution appropriée pour les réseaux HVDC grâce à sa modularité, sa faible fréquence de commutation et sa tension alternative quasi-sinusoïdale. En raison de sa topologie, son modèle mathématique est assez complexe et est donc souvent simplifié au stade de la conception. En particulier, la résistance équivalente au bras R, l'inductance du bras L et le courant circulant sont souvent négligés. Toutefois, les résultats expérimentaux obtenus avec notre prototype monophasé de MMC à pont complet à six niveaux ont montré que ces hypothèses ne sont

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22

Saha, Aparna Saha. "CONTROL OF MULTILEVEL CONVERTERS FOR VOLTAGE BALANCING AND FAULT-TOLERANT OPERATIONS." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1512661551448008.

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23

Lamont, Lisa Ann. "Modelling and control of a VSC (voltage source converter) tranmission system." Thesis, University of Ulster, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414074.

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Zhao, Xiaodong. "Advanced control of voltage source converter based multi-terminal HVDC systems." Thesis, Queen's University Belfast, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.676499.

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This thesis focuses on the advanced control methods for multi-terminal High Voltage Direct Current (HVDC) systems integrating offshore wind farms. Several key issues are investigated in this thesis, including controller design to improve the system dynamic performance, power loss reduction with controller optimization, system stability and dynamics assessment. A DC voltage backstepping control method is designed considering the cable dynamics and controller delay effects. DC cable and converter current loop dynamics are included in the voltage controller design. This control method is applied

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25

You, Keping Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "A new bidirectional AC-DC converter using matrix converter and Z-source converter topologies." Awarded by:University of New South Wales, 2007. http://handle.unsw.edu.au/1959.4/37450.

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This thesis proposes a new bidirectional three-phase AC-DC power converter using matrix converter and Z-source inverter topologies. Advantages of the AC-DC matrix converter are the inherently controllable power factor, the tight DC voltage regulation, the wide bandwidth with quick response to load variation, the single-stage buck-voltage AC-to-DC power conversion; advantages of the z-source inverter are the increased reliability by allowing the shoot-through between upper and lower power switches of one inverter leg, insensitivity to DC bus voltage due to the extra freedom of controlling DC-li

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Yin, Congqi. "Dynamic performance of voltage balancing and circulating current suppression control for modular multilevel converter." Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3765.

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Global power consumption has increased by approximately 3% each year over the past 15 years. The growing demand for energy has stimulated the spread of clean and reliable renewable energy networks and power grid interconnections throughout the world. For example, in Europe, there are 23 High Voltage Direct Current (HVDC) Transmission lines under construction which are scheduled for completion before 2024. The Modular Multilevel Converter (MMC) is one of the most attractive candidates for the HVDC transmission system converter technology. Its high flexibility and controllability make it an attr

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27

Ormrod, James Ernest. "Harmonic state space modelling of voltage source converters." Thesis, University of Canterbury. Electrical and Computer Engineering, 2013. http://hdl.handle.net/10092/8081.

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The thesis describes the development of a model of the three-phase Voltage Source Converter (VSC) in the Harmonic State Space (HSS) domain, a Linear Time Periodic (LTP) extension to the Linear Time Invariant (LTI) state space. The HSS model of the VSC directly captures harmonic coupling effects using harmonic domain modelling concepts, generalised to dynami- cally varying signals. Constructing the model using a reduced-order three-phase harmonic signal representation achieves conceptual simplification, reduced computational load, and direct inte- gration with a synchronous frame vector control

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28

Nami, Alireza. "A new multilevel converter configuration for high power and high quality applications." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/33216/1/Alireza_Nami_Thesis.pdf.

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The Queensland University of Technology (QUT) allows the presentation of theses for the Degree of Doctor of Philosophy in the format of published or submitted papers, where such papers have been published, accepted or submitted during the period of candidature. This thesis is composed of ten published /submitted papers and book chapters of which nine have been published and one is under review. This project is financially supported by an Australian Research Council (ARC) Discovery Grant with the aim of investigating multilevel topologies for high quality and high power applications, with speci

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29

Meier, Stephan. "Novel voltage source converter based HVDC transmission system for offshore wind farms." Licentiate thesis, KTH, School of Electrical Engineering (EES), 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-568.

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<p>Offshore wind farms have recently emerged as promising renewable energy sources. For increasing distances between offshore generation and onshore distribution grid, HVDC transmission systems based on voltage source converters can be a feasible and competitive solution. This thesis presents a comprehensive evaluation of a novel integrated wind farm topology that includes the generator drive system, the turbine interconnection and the HVDC transmission.</p><p>In the proposed concept, every wind turbine is connected to a single-phase medium-frequency collection grid via a distribution transfor

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Lu, Weixing 1966. "Control and application of multi-terminal HVDC based on voltage-source converter." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82921.

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A Multi-Terminal Direct Current (MTDC) system consists of several Voltage-Source Converters (VSCs) whose dc terminals are connected in shunt across the buses of a dc network. The dc voltages are determined by the electric charges stored across the dc capacitor of every Voltage-Source Converter (VSC). As dc over-voltage leads to failure in the solid-state switches and dc under-voltage leads to waveform distortion, the target of safe, economic design is a narrow voltage margin of about 5% around a nominal dc voltage rating. The worst case scenario consists of an accidental loss of a Volta

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AL, Jowder Fawzi A. Rahman. "Embedded SSSC in series capacitor compensation and in voltage source converter station." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84869.

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This thesis shows that series capacitive compensation of transmission lines by a combination of Static Synchronous Series Compensator (SSSC) and dielectric capacitors lowers the cost of series compensation. The SSSC has two functions: (1) to provide some series capacitive reactance compensation; (2) to damp out incipient unstable Subsynchronous Resonance (SSR) modes. Digital simulation using HYPERSIM shows that for an overall capacitive depth of compensation of 0.7 pu, the SSSC component is only about 1/3 of the capacitive Mvar. Based on the transient stability limit, the transmissibili

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32

Xu, Ling. "Modeling, Analysis and Control of Voltage-Source Converter in Microgrids and HVDC." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4967.

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The objective of this dissertation is to carry out dynamic modeling, analysis and control for Voltage-Source Converters (VSC). Two major applications of VSC will be investigated in this dissertation: microgrid application and High Voltage Direct Current (HVDC) application. In microgrid applications, VSC is used to integrate distributed energy sources such as battery and provide system functions: such as real and reactive power regulation, voltage and frequency support during islanding condition, and abnormal system condition mitigation. In HVDC applications, VSC is used to interconnect dc syst

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Sen, Gokhan. "Voltage and Current Programmed Modes in Control of the Z-Source Converter." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1226508637.

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Nampally, Ashok. "Investigation of modulation dynamics and control of modular multilevel converter for high voltage DC grids." Thesis, University of Aberdeen, 2017. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=235573.

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Energy security concerns and the impact of traditional sources of power generation on the climate have prompted a rise in renewable energy expansion around the world. Power transmission from remote generation sites to consumers over long distance is most efficient using High-Voltage Direct Current (HVDC) transmission lines. Consequently, HVDC and the integration of renewable resources are considered as key perspectives in the improvement of sustainable energy systems capable of secure and stable electric power supply. With the intention of huge energy demand in the future, the multi-terminal D

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Ayachit, Agasthya. "Steady-State and Small-Signal Modeling of A-Source Converter." Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1534187954423628.

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Pan, Jianyu. "Control of Four-Level Hybrid Clamped Converter for Medium-Voltage Variable-Frequency Drives." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1562943204567575.

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Ucak, Onur. "Design And Implementation Of A Voltage Source Converter Based Hybrid Active Power Filter." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611095/index.pdf.

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This research work is devoted to the analysis, design and implementation of a shunt connected Hybrid Active Power Filter by the use of a lower rated voltage source PWM converter, and a series connected LC passive filter. In recent years, voltage and current harmonics have become a serious problem both in transmission and distribution systems, due to the widespread usage of non-linear loads such as diode/thyristor rectifiers, electric arc furnaces and motor drives. In order to obtain a better performance than those of the conventional passive filter solutions, active power filters (APF) have be

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Bicer, Nazan. "A Current Source Converter Based Statcom For Reactive Power Compensation At Low Voltage." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/2/12612007/index.pdf.

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This research work is devoted to the analysis, design and development of the Current-Source Converter (CSC) based distribution-type Static Synchronous Compensator (D-STATCOM) for low-voltage applications in reactive-power control in order to achieve i) faster transient response in reactive-power control, ii) lower current harmonic distortion, iii) lower power losses and iv) minimum storage elements in comparison with conventional solutions. The developed CSC-D-STATCOM includes a low-pass input filter and a three phase forced-commutated CSC which is composed of six insulated gate bipolar transi

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Hamad, Mostafa Saad Abdallah. "Performance improvement of a medium-voltage series-connected twelve-pulse current source converter." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607443.

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This thesis investigates the performance of a medium-voltage (MV) 12-pulse controlled rectifier in conjunction with a tapped front-end transformer used with a shunt active power filter (APF) for ac-side compensation. A series APF based on a magnetic amplifier is used for dc-side compensation. The series APF is coupled with the shunt APF to a common controlled dc-bus. forming an ac/dc unified power controller. An operating power locus is introduced that combines symmetrical and asymmetrical firing of the two constituent 6-pulse converters. It provides the ' lowest' total harmonic distortion (TH

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Jiang, Xu [Verfasser]. "Protection Schemes for Modular Multilevel Converter Based High Voltage Direct Current Transmission System Converters / Xu Jiang." Aachen : Shaker, 2019. http://d-nb.info/1188550845/34.

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Peftitsis, Dimosthenis, Georg Tolstoy, Antonios Antonopoulos, et al. "High-Power Modular Multilevel Converters With SiC JFETs." KTH, Elektrisk energiomvandling, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-52687.

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This paper studies the possibility of building a modular multilevel converter (M2C) using silicon carbide (SiC) switches. The main focus is on a theoretical investigation of the conduction losses of such a converter and a comparison to a corresponding converter with silicon-insulated gate bipolar transistors. Both SiC BJTs and JFETs are considered and compared in order to choose the most suitable technology. One of the submodules of a down-scaled 3 kVA prototype M2C is replaced with a submodule with SiC JFETs without antiparallel diodes. It is shown that the diode-less operation is possible wi

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Alamri, Basem Rashid. "Losses and cost optimisation of PV multilevel voltage source inverter with integrated passive power filters." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/14537.

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Nowadays, the need for more contributions from renewable energy sources is rapidly growing. This is forced by many factors including the requirements to meet the targeted reductions of greenhouse gas emissions as well as improving the security of energy supply. According to the International Renewable Energy Agency (IRENA) report 2016, the total installed capacity of solar energy was at least 227 GWs worldwide by the end of 2015 with an annual addition of about 50 GWs in 2015, making solar power the world’s fastest growing energy source. The majority of these are grid-connected photo voltaic (

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Xie, Hailian. "Voltage Source Converters with Energy Storage Capability." Licentiate thesis, Stockholm : Division of electrical machines and power electronics, Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4191.

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Spahić, Ervin. "Voltage source converter HVDC connection of offshore wind farms and the application of batteries." Aachen Shaker, 2008. http://d-nb.info/992480779/04.

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Efika, Ikenna Bruce. "A multi-level multi-modular flying capacitor voltage source converter for high power applications." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/12154/.

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Two vital and dynamically changing issues are arising in the electric grid - an increase in electrical power demand, and subsequent reduction in power quality. Power electronics based solutions such as the Static Synchronous Compensator are increasingly deployed to mitigate power quality issues while High Voltage DC Transmission converters are currently installed to support the existing grid transmission capacity. Both applications require high power and high voltage power converters using switching devices with limited voltage ratings. The advent of Modular Multilevel Converters (MMC) is one

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Pouresmaeil, Edris. "Advance control of multilevel converters for integration of distributed generation resources into ac grid." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/83364.

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Distributed generation (DG) with a converter interface to the power grid is found in many of the green power resources applications. This dissertation describes a multi-objective control technique of voltage source converter (VSC) based on multilevel converter topologies, for integration of DG resources based on renewable energy (and non-renewable energy)to the power grid. The aims have been set to maintain a stable operation of the power grid, in case of di erent types of grid-connected loads. The proposed method provides compensation for active, reactive, and harmonic load current co

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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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Gebreel, Abd Almula G. M. "POWER CONVERSION FOR UHVDC TO UHVAC BASED ON USING MODULAR MULTILEVEL CONVERTER." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429358686.

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Etesami, Mohammadhossein. "On metaheuristics for design and modulation of multilevel inverters." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/132309/1/Mohammadhossein%20Etesami%20Thesis_Redacted.pdf.

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Multilevel inverters are introduced as a promising technology for high voltage applications. Associated design limits and control complexities hinder the wide use of multilevel converters. Motor drive overall efficiency is largely affected by the applied modulation technique. Selective Harmonic Elimination (SHE) Pulse Width Modulation (PWM) is a modulation technique which gives an excellent outcome suppressing low-order detrimental harmonics. Solving of the associated highly nonlinear equation set in SHE PWM has been one of the widely discussed numerical problems in power electronics. Three ke

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Terciyanli, Alper. "Design And Implementation Of A Current Source Converter Based Active Power Filter For Medium Voltage Applications." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611767/index.pdf.

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This research work is devoted to the design, development and implementation of a Current Source Converter (CSC) based Active Power Filter (APF) for Medium Voltage (MV) applications. A new approach has been proposed to the design of the CSC based APF for reducing the converter kVA rating considerably. This design approach is called the Selective Harmonic Amplification Method (SHAM), and is based on the amplification of some selected harmoniccurrent components of the CSC by the input filter, and the CSC control system, which is specifically designed for this purpose. The proposed SHAM has been i

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