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Dissertations / Theses on the topic 'Neutral Point Clamped (NPC) Converter'

Author: Grafiati

Published: 21 April 2022

Last updated: 18 July 2025

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1

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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2

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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3

Ahmadi, Sajjad. "Contribution à l'étude de la tolérance de pannes de convertisseurs multiniveaux en pont en H." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0026.

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La sûreté de fonctionnement de la conversion d’énergie est indispensable pour un grand nombre d’applications, en particulier lors de la mise en œuvre de convertisseurs multiniveaux. Par conséquent, il est important d’assurer la continuité de service de ces convertisseurs, lors de la défaillance d’un des semi-conducteurs. Dans cet objectif, ce mémoire propose un onduleur monophasé multiniveaux à tolérance de pannes, de structure Neutral Point Clamped (NPC) en pont en H, à cinq niveaux. L’algorithme de diagnostic de défaut est basé sur une étude préliminaire des modes de défaillance et repose do

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4

Lee, Meng Yeong. "Three-level neutral-point-clamped matrix converter topology." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10987/.

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Matrix converter is a direct AC-AC converter topology that is able to directly convert energy from an AC source to an AC load without the need of a bulky and limited lifetime energy storage element. Due to the significant advantages offered by matrix converter, such as adjustable power factor, capability of regeneration and high quality sinusoidal input/output waveforms, matrix converter has been one of the AC – AC topologies that receive extensive research attention for being an alternative to replace traditional AC-DC-AC converters in the variable voltage and variable frequency AC drive appl

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5

Salagae, Isaac Mahijoko. "Natural balancing of the neutral-point-clamped converter." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53514.

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Thesis (MScEng)--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: The three-level neutral-point-clamped(NPC) converter, being a widely used multilevel inverter, received a lot of attention recently due to problems associated with de-link capacitor voltage balancing. There are mainly two problems associated with the neutralpoint voltage of the NPC inverter: 1. At high modulation indices a low frequency ripple occurs on the neutral-point voltage. 2. Steady-state unbalance in the neutral-point voltage may arise due to a variety of factors including component imperfections, transients

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6

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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7

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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8

Ustuntepe, Bulent. "A Novel Two-parameter Modulation And Neutral Point Potential Control Method For The Three-level Neutral Point Clamped Inverter." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606928/index.pdf.

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In this thesis, the neutral point potential drift/fluctuation of the three-level neutral point clamped inverter is analyzed and a novel control algorithm, the two-parameter PWM method is proposed to confine the neutral point potential variation to a very small range. The two-parameter PWM method provides superior neutral point potential control performance even with small DC bus capacitors. The method is based on PWM pulse pattern modification and requires no additional hardware. Detailed analytical models of the neutral point current and potential as a function of the modulation parameters ar

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9

Sprenger, Michael [Verfasser]. "Untersuchung des Dreipunkt - Neutral Point Clamped - Stromrichters mit Spannungszwischenkreis (3L-NPC-VSC) für Niederspannungswindkraftanwendungen / Michael Sprenger." München : Verlag Dr. Hut, 2015. http://d-nb.info/1075409365/34.

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10

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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11

Zaragoza, Bertomeu Jordi. "Modulation strategies for the neutral-point-clamped converter and control of a wind turbine system." Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/130900.

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Els convertidors multinivell són topologies de convertidors d’electrònica de potència que poden generar tres o més nivells de voltatge en cadascuna de les fases de sortida. Com a resultat, els voltatges i corrents generats per aquestes topologies presenten una distorsió harmònica baixa. Hi ha diferents configuracions de convertidors multinivell, les quals es basen en connectar dispositius de potència o convertidors en sèrie. El resultat d’aquestes connexions permet obtenir voltatges alts, tant en la part de corrent continu com en la de corrent altern del convertidor. A més, cada dispositiu sol

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12

Lee, G. B. "A practical comparison between the three-phase series-stacked and neutral point clamped multilevel converter topologies." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53287.

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Thesis (MScEng)--Stellenbosch University, 2003.<br>ENGLISH ABSTRACT: The versatility of power electronic converters has made them a dominant force in the current electrical and electronic engineering industry. So too industry presents a wider range of applications, forever demanding operation at higher power levels. To meet this need a variety of multilevel converters have evolved. The challenge often lies in the selection of the appropriate topology for a specific application. This thesis presents a practical comparison between the Series-Stacked and Neutral Point Clamped multilevel conv

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13

Sprenger, Michael [Verfasser], Steffen [Akademischer Betreuer] Bernet, and Michael [Akademischer Betreuer] Braun. "Untersuchung des Dreipunkt – Neutral Point Clamped – Stromrichters mit Spannungszwischenkreis (3L-NPC-VSC) für Niederspannungswindkraftanwendungen / Michael Sprenger. Gutachter: Steffen Bernet ; Michael Braun." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://d-nb.info/107435012X/34.

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14

Gomez, Palomino Jonathan David. "Design and evaluation of a single phase 5 level full bridge neutral point clamped multi level converter." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/18304/.

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This thesis describes multilevel converters (MLC) designed for use with a repurposed electronic vehicle battery (battery 2nd life). MLC is of particular interest due to the low harmonic distortion content and reduced voltage stress in the switching devices. A detailed study of the MLC topologies and modulation techniques is presented. Space vector modulation is analysed and implemented to evaluate the converter. A comprehensive assessment of the MLC is presented using wide bandgap (WBG) devices highlighting the devices’ thermal and high switching frequency features.

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15

Ngo, Van Quang Binh. "Algorithmes de conception de lois de commande prédictives pour les systèmes de production d’énergie." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLC031/document.

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Cette thèse vise à élaborer de nouvelles stratégies de commande basées sur la commande prédictive pour le système de génération d’énergie éolienne. La topologie des systèmes de production éolienne basées sur le Générateur Asynchrone à Double Alimentation (GADA) qui convient à des plateformes de génération dans la gamme de puissance de 1.5 à 6 MW est abordée. Du point de vue technologique, le convertisseur à trois niveaux et clampé par le neutre (3L-NPC) est considéré comme une bonne solution pour une puissance élevée en raison de ses avantages: capacité à réduire la distorsion harmonique de la

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16

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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17

Silva, Tiago Lemes da. "Estudo do inversor monofásico NPC T-Type de cinco níveis para processamento de energia solar fotovoltaica." Universidade do Estado de Santa Catarina, 2014. http://tede.udesc.br/handle/handle/2080.

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Made available in DSpace on 2016-12-12T20:27:38Z (GMT). No. of bitstreams: 1 Tiago Lemes.pdf: 2229669 bytes, checksum: 9b9cd44356c6d0002fccf67fe418f52b (MD5) Previous issue date: 2014-09-26<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The main subject of this work is the study of a 5 levels T-Type NPC inverter topology, which is applied in photovoltaic energy processing for power generation. The grid power injection is done controlling converter current, which is injected into grid. This work presents equations, component-designs and their validation, which are necessary

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18

Hu, Xiao Ming. "Development of a System for Testing Grid-connected Doubly Fed Induction Generators with Implementation of a Three-level Neutral-Point-clamped Converter." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29443.

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Consistent international efforts have been made over the past few decades to move the world towards an environmentally sustainable society. Wind energy conversion systems (WECSs) are one of the largest contributors within this movement. Furthermore amongst existing wind turbine power generation technologies, the doubly fed induction generator (DFIG) has been distinctively popular for its lower capital costs especially in higher power applications. In order to study the integration of this type of generator into the grid, a laboratory based DFIG test rig was developed where its complete design

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19

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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20

Elamalayil, Soman Deepak. "Multilevel Power Converters with Smart Control for Wave Energy Conversion." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-332730.

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The main focus of this thesis is on the power electronic converter system challenges associated with the grid integration of variable-renewable-energy (VRE) sources like wave, marine current, tidal, wind, solar etc. Wave energy conversion with grid integration is used as the key reference, considering its high energy potential to support the future clean energy requirements and due the availability of a test facility at Uppsala University. The emphasis is on the DC-link power conditioning and grid coupling of direct driven wave energy converters (DDWECs). The DDWEC reflects the random nature o

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21

PORRU, MARIO. "Management and control of energy storage systems for stationary and automotive applications." Doctoral thesis, Università degli Studi di Cagliari, 2015. http://hdl.handle.net/11584/266607.

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This PhD dissertation has presented a number of scenarios in which Energy Storage Systems (ESSs) can be usefully employed for increasing energy system performances. Particularly, after introducing the State-of-the-Art of ESS technologies (Chapter 1), reference has been made to some stationary and automotive applications. Stationary applications have regarded Renewable Energy Sources (RESs) exploitation issues and EV integration within micro-grids (Chapter 2). It has been shown that ESSs are particularly useful in compensating for RES forecasting errors, whereas they are much less effecti

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22

Yazdani, Amirnaser. "Modelling and control of the three-level neutral point diode clamped (NPC) converter for high-power applications." 2005. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=370931&T=F.

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23

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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24

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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25

Lopes, Pedro Manuel Antunes Faria. "Diagnóstico de Avarias e Tolerância a Falhas em Filtros Activos de Potência de 3 e 4 Fios, Baseados na Topologia Multinível NPC." Master's thesis, 2012. http://hdl.handle.net/10316/99531.

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Dissertação de Mestrado Integrado em Engenharia Electrotécnica e de Computadores apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra.<br>Nos últimos anos, o mundo tem assistido a um grande desenvolvimento tecnológico marcado sobretudo pela proliferação de sistemas informáticos e de accionamentos eléctricos. No entanto, a utilização massiva deste tipo de cargas, ditas não-lineares, acarreta grandes problemas no que toca à qualidade da energia eléctrica, criando uma elevada poluição harmónica. Na tentativa de minimizar estes efeitos nocivos surgiram os filtros activos de

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26

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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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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28

Chen, Der-Jan, and 陳德政. "Study and Implementation of Neutral Point Diode Clamped Power Converter." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/77506145897757144144.

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碩士<br>國立雲林科技大學<br>電機工程系碩士班<br>89<br>The widespread use of solid-state converters have resulted in many power quality issues such as harmonic distortion in the line current, low power factor, low efficiency and voltage flicker, etc. In this thesis, a multilevel pulse width modulation (PWM) converter which is suitable for high voltage / high power applications is proposed. With the advantages of low voltage harmonic distortion, low EMI, low voltage rating of the switching devices, power reversible, easy implementation and reduction in size and weight, the proposed neutral point diode clamped pow

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29

Hung, Tsung-Liang, and 洪宗良. "Study and Implementation of Neutral Point AC Switch Clamped Power Converter." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/41714141138029908433.

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碩士<br>國立雲林科技大學<br>電機工程系碩士班<br>90<br>Power electronic products have been widely used in the industry. But these products produce the serious power pollution. The power pollution problems results in low power quality and low efficiency. The power quality include the cases of under-voltage, over-voltage, outage, surge, dip, voltage sag, voltage swell, harmonics, electromagnetic inference (EMI), flicker, voltage frequency variation and unbalance. In the recent market products, we can not find a perfect and low cost product to solve above mentioned problems for power pollution. Large current harmon

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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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31

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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32

Liu, Jun-Hui, and 劉俊輝. "Design and Implementation of Three-Phase Bi-directional Neutral-Point Clamped Converter." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/45685957040465744416.

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碩士<br>國立中正大學<br>電機工程研究所<br>101<br>This thesis presents three-phase bi-directional neutral-point clamped converter, include grid-connection mode and retification mode. The converter is divided into two parts of which,one is power stagewith neutral-point clamped configuration,theother is control stage with micro-controller RX-62T to realize thefeedforward current control law. In grid-connection mode,power is transformed into AC, and injected into current to the utility grid. In rectification mode, the grid current is transformed into DC to supply rectified load. Simulated and experimental result

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Li, Chun-Yi, and 李俊毅. "Design and Implementation of High Power Three-Phase Neutral-Point Clamped Converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/86797905595115159644.

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碩士<br>國立中正大學<br>電機工程研究所<br>102<br>This thesis presents design and implementation of a three-phase bi-directional neutral-point clamped converter, including two operation modes: grid-connection mode and rectification mode. The converter is divided into two parts, of which one is a power stage with neutral-point clamped configuration, the other is a control stage with a single-chip micro-controller Renesas RX-62T to realize the division-summation (D-Σ) digital control law. In grid-connection mode, power is transformed into AC and injected into the utility grid. In rectification mode, the utility

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34

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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35

Wang, Lijuan. "Design and an analysis of the stacked multicell converter with comparison to the neutral point clamped converter." 2003. http://hdl.handle.net/1993/20026.

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36

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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Wu, Meng Chen, and 吳孟臻. "Development of the Three-phase Four-Wire Active Power Filter with the Neutral Point Clamped Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/68094596919663698889.

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