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Dissertations / Theses on the topic 'Neutral-point voltage'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

Busquets, Monge Sergio. "A novel pulsewidth modulation for the comprehensive neutral-point voltage control in the three-level three-phase neutral-point-clamped dc-ac converte." Doctoral thesis, Universitat Politècnica de Catalunya, 2006. http://hdl.handle.net/10803/6372.

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Las topologías de convertidores multinivel han recibido una atención especial durante las dos últimas décadas debido a sus notables ventajas en aplicaciones de alta potencia y media/alta tensión. En estas topologías, y comparadas con el convertidor tradicional de dos niveles, el voltaje que soporta cada dispositivo semiconductor es menor, evitando los problemas asociados con la interconexión serie de dispositivos. La distorsión armónica en la tensión de salida es también menor y la eficiencia mayor. Pero incorporan un número superior de dispositivos semiconductores y la estrategia de modulació

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2

Somogyi, Chad Alexander. "Common mode voltage mitigation strategies using PWM in neutral-point-clamped multilevel inverters." Thesis, Marquette University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1594317.

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<p> Over the last several decades, there has been consistent growth in the research and development of multilevel voltage-source inverter-based adjustable speed motor drives (ASDs) as a result of low cost, high reliability power semiconductors. The three-level neutral-point-clamped (NPC) ASD is a popular multilevel inverter used in low and medium voltage applications because of its ability to produce lower levels of total harmonic distortion (THD) and withstand higher voltages while preserving the rated output power compared to two-level ASDs.</p><p> As with other voltage-source inverters, t

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3

Häger, Emil. "Performance Evaluation of Medium-Power Voltage Inverters." Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-118568.

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Power inverters, used to convert DC power to AC, are often used in e.g. solar power applications. However, they tend to be impractically large and expensive; as such, power miniaturization is an active research area. In this thesis, several classes of modern power inverters are evaluated and compared with regards to size, efficiency and output quality in order to identify areas of potential improvement. Methods for estimation of THD, power losses and input ripple are created and verified against a simulation of a five-level neutral-point-clamped inverter with SPWM control. Finally, this design

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4

Al, Shammeri Bashar Mohammed Flayyih. "A novel induction heating system using multilevel neutral point clamped inverter." Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/8305.

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This thesis investigates a novel DC/AC resonant inverter of Induction Heating (IH) system presenting a Multilevel Neutral Point Clamped (MNPCI) topology, as a new part of power supply design. The main function of the prototype is to provide a maximum and steady state power transfer from converter to the resonant load tank, by achieving zero current switching (ZCS) with selecting the best design of load tank topology, and utilizing the advantage aspects of both the Voltage Fed Inverter (VFI) and Current Fed Inverter (CFI) kinds, therefore it can considered as a hybrid-inverter (HVCFI) category

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5

Rankin, Paul Edward. "Modeling and Design of a SiC Zero Common-Mode Voltage Three-Level DC/DC Converter." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/93176.

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As wide-bandgap devices continue to experience deeper penetration in commercial applications, there are still a number of factors which make the adoption of such technologies difficult. One of the most notable issues with the application of wide-bandgap technologies is meeting existing noise requirements and regulations. Due to the faster dv/dt and di/dt of SiC devices, more noise is generated in comparison to Si IGBTs. Therefore, in order to fully experience the benefits offered by this new technology, the noise must either be filtered or mitigated by other means. A survey of various DC

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6

Mese, Huseyin. "Field Oriented Control Of Permanent Magnet Synchronous Motors Using Three-level Neutral-point-clamped Inverter." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614407/index.pdf.

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In this thesis, field oriented control of permanent magnet synchronous motors using three-level neutral-point-clamped inverter is studied. Permanent magnet synchronous motors are used in high performance drive applications. In this study, the permanent magnet synchronous motor is fed by three-level neutral-point-clamped inverter. For three-level neutral-point-clamped inverter different space vector modulation algorithms, which are reported in literature, are analyzed and compared via computer simulations. The voltage balance on dc-link capacitors is also analyzed and a software control method

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7

Jiao, Yang. "High Power High Frequency 3-level NPC Power Conversion System." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/56653.

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The high penetration of renewable energy and the emerging concept of micro-grid system raises challenges to the high power conversion techniques. Multilevel converter plays the key role in such applications and is studied in detail in the dissertation. The topologies and modulation techniques for multilevel converter are categorized at first by a thorough literature survey. The pros and cons for various multilevel topologies and modulation techniques are discussed. The 3-level neutral point clamped (NPC) topology is selected to build a 200kVA, 20 kHz power conversion system. The modularized ph

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8

Andler, Daniel [Verfasser]. "Experimental Investigation of Three-Level Active Neutral Point Clamped Voltage Source Converters using Integrated Gate-Commutated Thyristors / Daniel Andler." München : Verlag Dr. Hut, 2014. http://d-nb.info/1051550092/34.

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9

Andler, Osorio Daniel Andrés [Verfasser]. "Experimental Investigation of Three-Level Active Neutral Point Clamped Voltage Source Converters using Integrated Gate-Commutated Thyristors / Daniel Andler." München : Verlag Dr. Hut, 2014. http://d-nb.info/1051550092/34.

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10

Marzoughi, Alinaghi. "Investigating Impact of Emerging Medium-Voltage SiC MOSFETs on Medium-Voltage High-Power Applications." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/81822.

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For decades, the Silicon-based semiconductors have been the solution for power electronics applications. However, these semiconductors have approached their limits of operation in blocking voltage, working temperature and switching frequency. Due to material superiority, the relatively-new wide-bandgap semiconductors such as Silicon-Carbide (SiC) MOSFETs enable higher voltages, switching frequencies and operating temperatures when compared to Silicon technology, resulting in improved converter specifications. The current study tries to investigate the impact of emerging medium-voltage SiC MOSF

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11

Sprenger, Michael. "Untersuchung des Dreipunkt – Neutral Point Clamped – Stromrichters mit Spannungszwischenkreis (3L-NPC-VSC) für Niederspannungswindkraftanwendungen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-172806.

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Das Ziel der Arbeit war die Untersuchung eines neuartigen Phasenbausteins mit der Topologie des Dreipunkt – Neutral Point Clamped – Stromrichters mit Spannungszwischenkreis (3L-NPC-VSC) für Windkraftanwendungen. Wichtige Anforderungen an den Phasenbaustein und daraus resultierende Herausforderungen, sowie Lösungen für ausgewählte Teilprobleme werden präsentiert. Um die Vorteile des 3L-NPC-VSC für Hersteller von Windkraftanlagen zugänglich zu machen, ist es sinnvoll, einen neuartigen Phasenbaustein zu entwickeln. Der Phasenbaustein soll einfach in Systeme zu integrieren sein, in denen gegenwärt

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12

Wilson, Veas Alan Hjalmar [Verfasser], Steffen [Gutachter] Bernet, Mariusz [Gutachter] Malinowski, and Steffen [Akademischer Betreuer] Bernet. "Investigation of Multi-Level Neutral Point Clamped Voltage Source Converters using Isolated Gate Bipolar Transistor Modules / Alan Hjalmar Wilson Veas ; Gutachter: Steffen Bernet, Mariusz Malinowski ; Betreuer: Steffen Bernet." Dresden : Technische Universität Dresden, 2019. http://d-nb.info/1226899463/34.

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13

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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14

Wang, Yao Bang, and 王耀邦. "The Neutral-Point Voltage Control of Neutral Point Clamped Converters." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/32479767039129504408.

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15

Huang, Wei Lun, and 黃偉倫. "Strategies of Neutral Point Voltage Regulation for NPC-based Modular Multilevel Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/j9n2r9.

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16

"A novel pulsewidth modulation for the comprehensive neutral-point voltage control in the three-level three-phase neutral-point-clamped dc-ac converte." Universitat Politècnica de Catalunya, 2006. http://www.tesisenxarxa.net/TDX-0312110-112140/.

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17

Das, Soumitra. "Study on Pulsewidth Modulation Techniques for a Neutral-Point-Clamped Voltage Source Inverter." Thesis, 2012. http://etd.iisc.ac.in/handle/2005/3169.

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Neutral-point-clamped (NPC) three-level inverter is capable of handling higher dc bus voltage and producing output waveform of better quality than a conventional two-level inverter. The main objective of the present work is to analyze the existing PWM schemes for two-level and three-level inverters in terms of line current ripple, and to design new PWM techniques for the NPC inverter to reduce line current distortion. Various discontinuous PWM or bus-clamping PWM (BCPWM) methods for a two-level voltage source inverter are analyzed in terms of rms line current ripple, which is evaluated by int

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18

Das, Soumitra. "Study on Pulsewidth Modulation Techniques for a Neutral-Point-Clamped Voltage Source Inverter." Thesis, 2012. http://hdl.handle.net/2005/3169.

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Neutral-point-clamped (NPC) three-level inverter is capable of handling higher dc bus voltage and producing output waveform of better quality than a conventional two-level inverter. The main objective of the present work is to analyze the existing PWM schemes for two-level and three-level inverters in terms of line current ripple, and to design new PWM techniques for the NPC inverter to reduce line current distortion. Various discontinuous PWM or bus-clamping PWM (BCPWM) methods for a two-level voltage source inverter are analyzed in terms of rms line current ripple, which is evaluated by int

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19

Pai, Sheng-Yu, and 白昇右. "Design and Implementation of Diode-Clamped Three-Level Inverters with Neutral-Point Voltage Balance." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/566u35.

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碩士<br>國立臺北科技大學<br>電力電子產業研發碩士專班<br>95<br>The purpose of this thesis is to design and realize a diode-clamped three-level inverter with neutral-point voltage balance. The harmonic contents of output voltage of three-level inverters are less than those for two-level inverters. However, diode-clamped three-level inverter has the problem of neutral point voltage balance. This thesis uses two control methods to balance the voltage of DC-link capacitors and reduce the total harmonic distortion of output waveforms. The simulation results are derived from Matlab®/Simulink® software. The experimental re

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20

Wu, Ting-Lien, and 吳定濂. "A Dipolar-Switched Three-Level T-Type Inverter to Suppress Neutral-Point Voltage Ripple." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/d38w4j.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>107<br>In recent years, three-level T-type inverter has been widely applied in solar power generation systems because of its advantages of high efficiency and low switching harmonics. In order to improve the efficiency of solar cell array, two solar cell strings with independent maximum power point tracking are respectively used as the power sources of three-level T-type inverter. However, the input DC voltages of three-level T-type inverter will be unbalanced and distort the output current. In addition, the traditional modulation method will result in the triple-f

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21

Tsai, Meng Ru, and 蔡孟儒. "A PWM Technology for Common-Mode-Voltage Reduction of Three-Level Neutral-Point-Clamped Converters." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/cf99e8.

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22

Wilson, Veas Alan Hjalmar. "Investigation of Multi-Level Neutral Point Clamped Voltage Source Converters using Isolated Gate Bipolar Transistor Modules." 2018. https://tud.qucosa.de/id/qucosa%3A33846.

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Among the multilevel (ML)-voltage source converters (VSCs) for medium voltage (MV) and high power (HP) applications, the most used power topology is the three level (3L)-neutral point clamped (NPC)-VSC, due to its features such as common direct current (DC)-bus capability with medium point, absence of switches in series-connection, low part count, and straightforward control. The use of MV-insulated gate bipolar transistor (IGBT) modules as power switches offers further advantages like inexpensive gate drivers and survival capability after short-circuit. However, the IGBT modules have a reduce

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23

Chu, Pei Yuan, and 朱培元. "Control of DC Bus Voltage of Neutral Point Clamped H-bridge Modules of Cascaded Multilevel converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/99053828340705029019.

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24

Hsu, Yen-Chih, and 許彥智. "Development of Space Vector Modulation Techniques and Voltage Balancing Control for Three-Level Neutral-Point-Clamped Converters." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/55619104486138906822.

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碩士<br>國立清華大學<br>電機工程學系<br>98<br>Three-level neutral-point-clamped converters are usually chosen for high-power applications as motor drive. Comparing with two-level converts, three-level neutral-point-clamped converters have half the voltage stress on switching device for the same DC-link voltage. The three-level neutral-point-clamped converters are able to output 3 level-step-shaped phase voltage and 5 level-step-shaped line-to-line voltage. So it can reduce harmonics in the output voltage and current. The performance of a three-level neutral-point-clamped converters depends on its PWM modul

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25

ZHENG, YU-XIANG, and 鄭宇翔. "Three-level Neutral Point Clamped (NPC) Rectifier Using DC-Bus Voltage Ripple Analysis under Unbalanced Grid Source." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7933z5.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>107<br>This thesis proposes a control strategy for a three-level diode clamped ac/dc converter to achieve balanced line current under unbalanced ac source. Consequently, through the control scheme proposed, in this paper, it can not only balance input current but also reduce dc output voltage ripple when three-phase neutral-point clamped rectifier works on input voltage unbalance condition. The proposed strategy is based on the ripple characteristics in the dc filter capacitors deployed in the dc output. The ac ripples contained in the dc voltages of the filter capac

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26

Tsai, Yueh-Ting, and 蔡岳廷. "Leakage Current Reduction and Neutral Point Voltage Balancing Control for MVPWM-Controlled Three-Level T-Type PV Inverter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/nmej3g.

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碩士<br>國立中山大學<br>電機工程學系研究所<br>107<br>The three level T-type inverter has been widely used in photovoltaic generation. In photovoltaic system, leakage current is ensued from the common mode voltage variation between the photovoltaic module and the ground. The leakage current results in photovoltaic cell performance induced deterioration (PID). This paper reduces leakage current by the basis of medium voltage vector pulse width modulation (MVPWM). Although MVPWM can achieve zero leakage current, however, the neutral-point voltage of the inverter is not able to be balanced due to medium-voltage ve

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27

Gopalakrishnan, K. S. "Study On DC-Link Capacitor Current In A Three-Level Neutral-Point Clamped Inverter." Thesis, 2013. https://etd.iisc.ac.in/handle/2005/2628.

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Three-level diode-clamped inverter is being widely used these days. Extensive research has been carried out on pulse width modulation (PWM) strategies for a three-level inverter. The most widely used PWM strategies are sine-triangle pulse width modulation (SPWM) and centered space vector pulse width modulation (CSVPWM). The influence of these PWM strategies on the DC-link capacitor current and voltage ripple is studied in this thesis. The sizing of the DC capacitor depends on value of the maximum RMS current flowing through it. In this work, an analytical expression for capacitor RMS current

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28

Gopalakrishnan, K. S. "Study On DC-Link Capacitor Current In A Three-Level Neutral-Point Clamped Inverter." Thesis, 2013. http://etd.iisc.ernet.in/handle/2005/2628.

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Three-level diode-clamped inverter is being widely used these days. Extensive research has been carried out on pulse width modulation (PWM) strategies for a three-level inverter. The most widely used PWM strategies are sine-triangle pulse width modulation (SPWM) and centered space vector pulse width modulation (CSVPWM). The influence of these PWM strategies on the DC-link capacitor current and voltage ripple is studied in this thesis. The sizing of the DC capacitor depends on value of the maximum RMS current flowing through it. In this work, an analytical expression for capacitor RMS current

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29

Sprenger, Michael. "Untersuchung des Dreipunkt – Neutral Point Clamped – Stromrichters mit Spannungszwischenkreis (3L-NPC-VSC) für Niederspannungswindkraftanwendungen." Doctoral thesis, 2014. https://tud.qucosa.de/id/qucosa%3A28801.

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Das Ziel der Arbeit war die Untersuchung eines neuartigen Phasenbausteins mit der Topologie des Dreipunkt – Neutral Point Clamped – Stromrichters mit Spannungszwischenkreis (3L-NPC-VSC) für Windkraftanwendungen. Wichtige Anforderungen an den Phasenbaustein und daraus resultierende Herausforderungen, sowie Lösungen für ausgewählte Teilprobleme werden präsentiert. Um die Vorteile des 3L-NPC-VSC für Hersteller von Windkraftanlagen zugänglich zu machen, ist es sinnvoll, einen neuartigen Phasenbaustein zu entwickeln. Der Phasenbaustein soll einfach in Systeme zu integrieren sein, in denen gegenwärt

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30

Yadav, Apurv Kumar. "Investigations on Multilevel Voltage Space Vectors Generated by Stacked and Cascaded Basic Inverter Cells with Capacitor Voltage Control for Induction Motor Drives." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5451.

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Induction motor drives (IMD) require a DC-AC inverter system to obtain variable frequency operation. Generally, IMD uses conventional 2-level inverters. The conventional 2-level inverter has its pole switching between zero and DC bus voltage. Thus, the switching in 2-level inverter results in high dv/dt in the inverter pole voltage. Also, the switches in the inverter need to block a full DC link voltage which increases the switching losses. These issues with drive scheme using 2-level inverter can be addressed by using multilevel inverters (MLI). Some of the frequently used MLI topologies incl

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31

Debnath, Tutan. "Investigations on Voltage Control of Stacked DC-link Series Capacitors with a Nine-Level Inverter for an Induction Motor Load." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6076.

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Multilevel Inverters offer several advantages over two-level inverters in applications involving medium voltage and high power levels. A variety of applications are now available for MLI technology, ranging from variable speed drives to high voltage DC (HVDC) applications, power factor correction, and renewable energy sources. The advantages of MLI include the use of devices with low voltage ratings, low switching losses, minimal electromagnetic interference, and low dV/dt stress for the solid state devices. Further, as the number of MLI increases, it o ers a nearly sinusoidal stepped p

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32

Viju, Nair R. "Investigations on Stacked Multilevel Inverter Topologies Using Flying Capacitor and H-Bridge Cells for Induction Motor Drives." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4026.

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Conventional 2-level inverters have been quite popular in industry for drives applications. It used pulse width modulation techniques to generate a voltage waveform with high quality. For achieving this, it had to switch at high frequencies and also the switching is between 0 and Vdc. Also additional LC filters are required before feeding to a motor. 3-phase IM is the work horse of the industry. Several speed control techniques have been established namely the V/f control technique and for high performance, vector control is adopted. An electric drive system comprises of a rectifier, inverter

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33

Viju, Nair R. "Investigations on Stacked Multilevel Inverter Topologies Using Flying Capacitor and H-Bridge Cells for Induction Motor Drives." Thesis, 2018. http://etd.iisc.ernet.in/2005/4005.

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Conventional 2-level inverters have been quite popular in industry for drives applications. It used pulse width modulation techniques to generate a voltage waveform with high quality. For achieving this, it had to switch at high frequencies and also the switching is between 0 and Vdc. Also additional LC filters are required before feeding to a motor. 3-phase IM is the work horse of the industry. Several speed control techniques have been established namely the V/f control technique and for high performance, vector control is adopted. An electric drive system comprises of a rectifier, inverter

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34

De, Sukumar. "Rectifier And Inverter System For Driving Axial Flux BLDC Motors In More Electric Aircraft Application." Thesis, 2011. https://etd.iisc.ac.in/handle/2005/2080.

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In the past two decades the core aircraft technology is going through a drastic change. The traditional technologies that is almost half a century old, is going through a complete revamp. In the new “More Electric Aircraft” technology many mechanical, pneumatic and hydraulic systems are being replaced by electrical and power electronic systems. Airbus-A380, Boeing B-787 are the pioneers in the family of these new breed of aircrafts. As the aircraft technology is moving towards “More Electric”, more and more electric motors and motor controllers are being used in new aircrafts. Number of electr

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35

De, Sukumar. "Rectifier And Inverter System For Driving Axial Flux BLDC Motors In More Electric Aircraft Application." Thesis, 2011. http://etd.iisc.ernet.in/handle/2005/2080.

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In the past two decades the core aircraft technology is going through a drastic change. The traditional technologies that is almost half a century old, is going through a complete revamp. In the new “More Electric Aircraft” technology many mechanical, pneumatic and hydraulic systems are being replaced by electrical and power electronic systems. Airbus-A380, Boeing B-787 are the pioneers in the family of these new breed of aircrafts. As the aircraft technology is moving towards “More Electric”, more and more electric motors and motor controllers are being used in new aircrafts. Number of electr

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36

Krug, Dietmar. "Vergleichende Untersuchungen von Mehrpunkt-Schaltungstopologien mit zentralem Gleichspannungszwischenkreis für Mittelspannungsanwendungen." Doctoral thesis, 2015. https://tud.qucosa.de/id/qucosa%3A30069.

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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 de

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