Relevant bibliographies by topics / Multilevel Power Converters

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  2. Dissertations / Theses
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Academic literature on the topic 'Multilevel Power Converters'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Multilevel Power Converters"

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Verdugo, Cristian, Samir Kouro, Christian A. Rojas, Marcelo A. Perez, Thierry Meynard, and Mariusz Malinowski. "Five-Level T-type Cascade Converter for Rooftop Grid-Connected Photovoltaic Systems." Energies 12, no. 9 (May 8, 2019): 1743. http://dx.doi.org/10.3390/en12091743.

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Multilevel converters are widely considered to be the most suitable configurations for renewable energy sources. Their high-power quality, efficiency and performance make them interesting for PV applications. In low-power applications such as rooftop grid-connected PV systems, power converters with high efficiency and reliability are required. For this reason, multilevel converters based on parallel and cascaded configurations have been proposed and commercialized in the industry. Motivated by the features of multilevel converters based on cascaded configurations, this work presents the modulation and control of a rooftop single-phase grid-connected photovoltaic multilevel system. The configuration has a symmetrical cascade connection of two three-level T-type neutral point clamped power legs, which creates a five-level converter with two independent string connections. The proposed topology merges the benefits of multi-string PV and symmetrical cascade multilevel inverters. The switching operation principle, modulation technique and control scheme under an unbalanced power operation among the cell are addressed. Simulation and experimental validation results in a reduced-scale power single-phase converter prototype under variable conditions at different set points for both PV strings are presented. Finally, a comparative numerical analysis between other T-type configurations to highlight the advantages of the studied configuration is included.
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Dybko, Maxim, Sergey Brovanov, and Hong Hee Lee. "Multilevel NPC Converters in Parallel Connection for Power Conditioning Systems." Applied Mechanics and Materials 792 (September 2015): 189–96. http://dx.doi.org/10.4028/www.scientific.net/amm.792.189.

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This paper investigates a multilevel combined NPC converter for medium-and high-power energy storage systems and active power filters. The proposed multilevel NPC converter is composed of a parallel connection of multiple NPC converters using the current sharing reactors and involves the phase shifted PWM strategy for better energy quality performance. Using the switching function-based mathematical model, the proposed multilevel converter is evaluated to show the energy quality performance and fault tolerance of an energy storage system or active power filter. In addition, the switching frequency of circulating currents is analyzed to obtain its relationship with the converter parameters and maximum sharing reactor current ripple. The performance of the proposed multilevel converter is verified by simulation.
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Mei, Zhiting, Jingyang Fang, and Stefan Goetz. "Control and Optimization of Lattice Converters." Electronics 11, no. 4 (February 15, 2022): 594. http://dx.doi.org/10.3390/electronics11040594.

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Multilevel converters continue their upward trend in renewable generation, electric vehicles, and power quality conditioning applications. Despite having satisfactory voltage capabilities, mainstream multilevel converters suffer from poor current sharing performances, thereby leading to the development of lattice converters, i.e., a strong and versatile type of future multilevel power converters. This article addresses two problems faced by lattice converters. First, we propose and detail how to optimize the efficiency of a given lattice converter by controlling the on/off states of H-bridge submodules. Second, we introduce the method that determines the voltage at each node of the converter in order to satisfy output voltage and current requirements. Design and analysis of lattice converters need a different mathematical toolbox than routinely exercised in power electronics. By use of graph theory, this article provides control methods of 3 × 3 and 4 × 4 lattice converters, satisfying various control objectives such as input/output terminals and output voltages. We further validate the methods with simulation results. The methodologies, algorithms, and special cases described in the article will aid further design and refinement of more efficient and easy-to-control lattice converters.
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G, Ramya, and Ramaprabha R. "A Review on Designand Control Methods of Modular Multilevel Converter." International Journal of Power Electronics and Drive Systems (IJPEDS) 7, no. 3 (September 1, 2016): 863. http://dx.doi.org/10.11591/ijpeds.v7.i3.pp863-871.

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Modular multilevel converters (MMC) are an emerging voltage source converter topology suitable for many applications. Due to abundant utilization of HVDC power transmission, the modular multilevel converter has become popular converter type to be used in high voltage applications. Other applications include interfacing renewable energy power sources to the grid and motor drives. Modular multilevel converters are beneficial for high voltage and high power motor drives because of the properties of this converter topology, such as, low distortion, high efficiency, etc. For the past few years significant research has been carried out to address the technical challenges associated with operation and voltage balancing of MMC. In this paper, a detailed technical review on the control strategies is presented for ready reference.
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Mechouma, Rabiaa, and Boubekeur Azoui. "Multiple low frequency dual reference PWM control of a grid connected photovoltaic three phase NPC inverter with DC/DC boost converter." Serbian Journal of Electrical Engineering 11, no. 2 (2014): 315–37. http://dx.doi.org/10.2298/sjee1402315m.

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In recent years, power demand of industrial applications has increased significantly reaching some megawatts. The use of multilevel converters for applications of medium and high powers is proposed as a solution to drawback semiconductor technology. A multilevel converter not only achieves high power ratings, but also enables the use of renewable energy sources. Renewable energy sources such as photovoltaic can be easily interfaced to a multilevel converter system for a high power application. This paper presents the simulation study in Matlab/Simulink of a grid connected photovoltaic three phase Neutral Point Clamped (NPC) inverter with DC/DC boost converter for constant and variable solar radiation.
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Jih-Sheng Lai and Fang Zheng Peng. "Multilevel converters-a new breed of power converters." IEEE Transactions on Industry Applications 32, no. 3 (1996): 509–17. http://dx.doi.org/10.1109/28.502161.

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Paulo, Matheus Sene, Andrei de Oliveira Almeida, Pedro Machado de Almeida, and Pedro Gomes Barbosa. "Control of an Offshore Wind Farm Considering Grid-Connected and Stand-Alone Operation of a High-Voltage Direct Current Transmission System Based on Multilevel Modular Converters." Energies 16, no. 16 (August 9, 2023): 5891. http://dx.doi.org/10.3390/en16165891.

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This work presents a control strategy for integrating an offshore wind farm into the onshore electrical grid using a high-voltage dc transmission system based on modular multilevel converters. The proposed algorithm allows the high-voltage DC system to operate in grid-connected or stand-alone modes, with the second case supplying power to local loads. In either mode, the modular multilevel rectifier works as a grid-forming converter, providing the reference voltage to the collector network. During grid-connected operation, the modular multilevel inverter regulates the DC link voltage while the generating units are controlled to maximize power extracted from the wind turbines. Conversely, in the event of grid disconnection, the onshore modular multilevel converter takes over the regulation of the AC voltage at the point of connection to the grid, ensuring energy supply to local loads. Simultaneously, the generator controller transitions from tracking the maximum power of the wind turbines to regulating the DC link voltage, preventing excessive power injection into the transmission DC link. Additionally, the turbine pitch angle control regulates the speed of the generator. Mathematical models in the synchronous reference frame were developed for each operation mode and used to design the converter’s controllers. A digital model of the wind power plant and a high-voltage dc transmission system was implemented and simulated in the PSCAD/EMTDC program. The system modeled includes two groups of wind turbines, generators, and back-to-back converters, in addition to a DC link with a rectifier and an inverter station, both based on modular multilevel converters with 18 submodules per arm, and a 320 kV/50 km DC cable. Aggregate models were used to represent the two groups of wind turbines, where 30 and 15 smaller units operate in parallel, respectively. The performance of the proposed control strategy and the designed controllers was tested under three distinct scenarios: disconnection of the onshore converter from the AC grid, partial loss of a wind generator set, and reconnection of the onshore converter to the AC grid.
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Jeong, In Wha. "DC-Link Capacitor Voltage Balancing Control of a Five-Level Regenerative AC Electronic Load Using One-Cycle Control." Energies 14, no. 19 (September 24, 2021): 6101. http://dx.doi.org/10.3390/en14196101.

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High voltage electric power equipment requires rigorous regulation testing to specific standards which ensure proper and safe operation in the grid. Manufacturers conduct these tests in order to prove standard compliance and product liability. Variable linear or nonlinear loads are necessary for testing medium voltage (MV) high power AC power converters. Generally, those AC power converters or power supplies require performance validation, burn-in and/or lifetime testing under different load conditions, defined by the end-user or standards for the given applications. For flexible and efficient MV verification testing, this paper presents a five-level multilevel converter-based MV regenerative AC electronic load with one-cycle control (OCC), which is based on five-level diode-clamped multilevel converters with back-to-back structure and can emulate any impedance load. In this paper, especially the dc-link capacitor voltage balance of the proposed multilevel MV regenerative AC load is deeply analyzed. Simulation and experimental results are presented to verify the dc-link voltage balance performance of the proposed multilevel MV regenerative AC electronic load.
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Majdoul, Radouane, Abelwahed Touati, Abderrahmane Ouchatti, Abderrahim Taouni, and Elhassane Abdelmounim. "A nine-switch nine-level converter new topology with optimal modulation control." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 2 (June 1, 2021): 932. http://dx.doi.org/10.11591/ijpeds.v12.i2.pp932-942.

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<span lang="EN-US">Multilevel power converters are becoming increasingly used in several sectors: energy, grid-tie renewable energy systems, High voltage direct current (HVDC) power transmission, and a multitude of industrial applications. However, the multilevel converters consist of several drives and a high number of power switches, which leads to a considerable cost and an increased size of the device. Thus, a novel topology of a multilevel bidirectional inverter using a reduced number of semiconductor power components is proposed in this paper. Without any diode clamped or flying capacitor, only nine switches are used to generate nine voltage levels in this new topology. The proposed multilevel converter is compared with the conventional structures in terms of cost, the number of active power switches, clamped diodes, flying capacitors, DC floating capacitors, and the number of DC voltage sources. This comparative analysis shows that the proposed topology is suitable for many applications. For optimum control of this multilevel voltage inverter and to reduce switching losses in power semiconductors, a hybrid modulation technique based on fundamental frequency modulation and multi-carrier-based sinusoidal pulse-width modulation schemes is performed. The effectiveness of the proposed multilevel power converter is verified by simulation results.</span>
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Okhotkin, Grigory P., and Ivan I. Ivanchin. "SPACE VECTOR PWM IN A MULTILEVEL VOLTAGE CONVERTER." Vestnik Chuvashskogo universiteta, no. 1 (March 30, 2022): 107–14. http://dx.doi.org/10.47026/1810-1909-2022-1-107-114.

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The present article considers the voltage forming by multilevel converters. Multilevel converters are widely used in industry applications with medium voltages up to 20 kV. An example is the oil industry, where multilevel converters are installed in electric drives of pumping units on pipeline systems. The location of the pipelines in isolated areas implies weak net connections for power system and expects increased requirements for the efficiency of the use of electricity. In this regard, for a multilevel voltage converter, an energy-efficient vector method of pulse-width modulation is proposed. With vector pulse-width modulation, the optimal number of voltage level switching occurs in the phases of the converter, which leads to the lowest harmonic distortion of the voltage, compared with other modulation methods. The features of vector pulse-width modulation in multilevel voltage converters caused by the increased number of basic voltage vectors of a static multilevel converter are analyzed. A step-by-step method of vector pulse-width modulation in a multilevel converter is proposed, including determining the base vectors of the converter closest to a reference voltage vector, calculating the time for each of the base vectors, maintaining the switching order between the base vectors. The method is considered in detail for a multilevel converter with five voltage levels in a phase. In conclusion, the results of modeling control system of this converter with the proposed method of vector pulse-width modulation are presented. According to the obtained time diagrams of voltage formation, a hodograph of the resulting vector of the output voltage of a multilevel static converter was constructed.
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Dissertations / Theses on the topic "Multilevel Power Converters"

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Ferreira, Abel António de Azevedo. "Modular multilevel converters for power system applications." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/405894.

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This thesis discusses the operation of the grid-tied modular multilevel converters (MMC) applied on the dc power transmission, particularly on the medium and high-voltage applications. First, it is presented the evolution of the power converters used on the high-voltage dc transmission field (HVdc) with special focus on the modular multilevel-based power converters. Then, due to the intrinsic nature of the converter, besides the control requirements for its dc and ac buses interactions, its energy storage should be carefully managed in order to achieve a safe and knowledgeable operation of this power converter. Hence, its control requirements are presented and mathematically supported. Moreover, the progressive design and validation of its control loops is addressed in this thesis by means of the converter simulation over a broad range of operating conditions. One key-point factor of the MMC performance is the strategy followed to modulate the voltages generated on its arms. In this vision, different modulation techniques were combined with peculiar zero sequence signals in order to analyze their impact on the voltages across the converter arms and its intrinsic performance. This study was also complemented by different procedures followed to balance the energy storage of its capacitors. A transversal research question of this voltage source converter topology is its efficiency. Then, besides the analysis of the ac power flow impact on the power losses produced by its semiconductors, it is deduced and proposed a mathematical expression that that can describe the power losses produced semiconductors, over a broad range of operating conditions of the MMC. Finally, it is explored the possible degrees of freedom of an half-bridge-based MMC whenever it is operating in the static synchronous compensation (STATCOM) mode. Depending on the converter operation aspect that is required to be optimized, the voltage across its dc poles can be adjusted to achieve an improved performance of the MMC
La presente tesis trata sobre el funcionamiento de los convertidores modulares de multinivel (MMC) utilizados en la transmisión de energía eléctrica en corriente continua, en particular para aplicaciones de media y alta tensión. En primer lugar, se presenta la evolución de los convertidores utilizados en el campo de la transmisión de energía eléctrica mediante enlaces en corriente continua de alta tensión(HVdc), haciendo especial énfasis en los convertidores de topología multinivel. Debido a la naturaleza intrínseca del convertidor MMC, se debe regular el intercambio de potencia entre las redes de corriente alterna y continua a las que se conecta, junto con la energía interna almacenada, para asegurar un buen funcionamiento del mismo. Por ello, se presenta una descripción del control del convertidor soportada por un riguroso análisis matemático. El diseño de los diferentes lazos de control se valida mediante simulaciones representando diferentes condiciones de funcionamiento posibles. Un factor clave del rendimiento del MMC es la estrategia de modulación utilizada para aplicar voltajes en cada una de sus ramas. Para evaluar sus diferencias a nivel de pérdidas, se presenta una comparativa entre diferentes técnicas de modulación incorporando secuencia homopolar. Este estudio se complementa con el estudio de diferentes procedimientos seguidos para equilibrar el almacenamiento de energía en los condensadores de una rama. Una cuestión de investigación transversal de esta topología de convertidor de tensión es su eficiencia. Posteriormente, se obtiene una expresión matemática que permite describir las pérdidas de los semiconductores del convertidor en funcionamiento, para diferentes niveles de transferencia de potencia. Finalmente, se analizan los posibles grados de libertad de un MMC operando en modo de compensación de potencia reactiva (STATCOM). En base a la operación de dicho convertidor y de la variable que se requiera optimizar, resulta posible variar la tensión entre sus polos DC para lograr un mejor funcionamiento del convertidor
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Serbia, Nicola. "Modular Multilevel Converters for HVDC power stations." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2014. http://tel.archives-ouvertes.fr/tel-00945375.

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Les travaux présentés dans ce mémoire ont été réalisés dans le cadre d'une collaboration entre le LAboratoire PLAsma et Conversion d'Énergie (LAPLACE), Université de Toulouse, et la Seconde Université de Naples (SUN). Ce travail a reçu le soutien de la société Rongxin Power Electronics (Chine) et traite de l'utilisation des convertisseurs multi-niveaux pour le transport d'énergie électrique en courant continu Haute Tension (HVDC). Depuis plus d'un siècle, la génération, la transmission, la distribution et l'utilisation de l'énergie électrique sont principalement basées sur des systèmes alternatifs. Les systèmes HVDC ont été envisagés pour des raisons techniques et économiques dès les années 60. Aujourd'hui il est unanimement reconnu que ces systèmes de transport d'électricité sont plus appropriés pour les lignes aériennes au-delà de 800 km de long. Cette distance limite de rentabilité diminue à 50 km pour les liaisons enterrées ou sous-marines. Les liaisons HVDC constituent un élément clé du développement de l'énergie électrique verte pour le XXIème siècle. En raison des limitations en courant des semi-conducteurs et des câbles électriques, les applications à forte puissance nécessitent l'utilisation de convertisseurs haute tension (jusqu'à 500 kV). Grâce au développement de composants semi-conducteurs haute tension et aux architectures multicellulaires, il est désormais possible de réaliser des convertisseurs AC/DC d'une puissance allant jusqu'au GW. Les convertisseurs multi-niveaux permettent de travailler en haute tension tout en délivrant une tension quasi-sinusoïdale. Les topologies multi-niveaux classiques de type NPC ou " Flying Capacitor " ont été introduites dans les années 1990 et sont aujourd'hui couramment utilisées dans les applications de moyenne puissance comme les systèmes de traction. Dans le domaine des convertisseurs AC/DC haute tension, la topologie MMC (Modular Multilevel Converter), proposée par le professeur R. Marquardt (Université de Munich, Allemagne) il y a dix ans, semble particulièrement intéressante pour les liaisons HVDC. Sur le principe d'une architecture de type MMC, le travail de cette thèse propose différentes topologies de blocs élémentaires permettant de rendre le convertisseur AC/DC haute tension plus flexible du point de vue des réversibilités en courant et en tension. Ce document est organisé de la manière suivante. Les systèmes HVDC actuellement utilisés sont tout d'abord présentés. Les configurations conventionnelles des convertisseurs de type onduleur de tension (VSCs) ou de type onduleur de courant (CSCs) sont introduites et les topologies pour les systèmes VSC sont ensuite plus particulièrement analysées. Le principe de fonctionnement de la topologie MMC est ensuite présenté et le dimensionnement des éléments réactifs est développé en considérant une commande en boucle ouverte puis une commande en boucle fermée. Plusieurs topologies de cellules élémentaires sont proposées afin d'offrir différentes possibilités de réversibilité du courant ou de la tension du côté continu. Afin de comparer ces structures, une approche analytique de l'estimation des pertes est développée. Elle permet de réaliser un calcul rapide et direct du rendement du système. Une étude de cas est réalisée en considérant la connexion HVDC d'une plateforme éolienne off-shore. La puissance nominale du système étudié est de 100 MW avec une tension de bus continu égale à 160 kV. Les différentes topologies MMC sont évaluées en utilisant des IGBT ou des IGCT en boitier pressé. Les simulations réalisées valident l'approche analytique faite précédemment et permettent également d'analyser les modes de défaillance. L'étude est menée dans le cas d'une commande MLI classique avec entrelacement des porteuses. Enfin, un prototype triphasé de 10kW est mis en place afin de valider les résultats obtenus par simulation. Le système expérimental comporte 18 cellules de commutations et utilise une plate-forme DSP-FPGA pour l'implantation des algorithmes de commande.
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Lund, Richard. "Multilevel Power Electronic Converters for Electrical motor Drives." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-687.

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Power electronic converters are widely used in industrial power conversion systems both for utility and drives applications. As the power level increases, the voltage level is increased accordingly to obtain satisfactory efficiency. During the last years, the voltage rating of fast switching high voltage semiconductors such as the Insulated Gate Bipolar Transistor (IGBT) has increased. Still, there is a need for series connection of switching devices. In this area of applications, the Multilevel Converter has shown growing popularity.

The fundamental advantages of the Multilevel Converter topologies are low distorted output waveforms and limited voltage stress on the switching devices. The main disadvantages are higher complexity and more difficult control.

In this thesis, Multilevel Converters are analysed for large motor drive applications. The main focus has been on converter losses, output waveform quality and control.

Analytical expressions for both switching and conduction losses for 4- and 5-level Diode Clamped Converters have been developed. The investigation shows that the losses can be reduced by utilizing a multilevel topology for a 1 MW drive. This work is presented in [46]. The same reduction in losses is proven for a 2300V/ 3 MW drive.

Analytical expressions for the harmonic losses in 3-level converters have been developed for 2 different Carrier Based PWM schemes, presented in [56], [57] and [58]. Also Space Vector PWM are investigated and compared by simulations, in addition to 4- and 5-level Carrier Based PWM.

DC-bus balancing in both 3- and 5-level converters is discussed. Balancing in 3- level converters can be achieved by proper control. Balancing in 5-level converters can be achieved by proper arrangement of isolated DC-supplies.

One 40kW 3-level converter and one 5kW 5-level converter has been designed and built. Experimental verification of the analytical and simulated results is shown.

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Peftitsis, Dimosthenis, Georg Tolstoy, Antonios Antonopoulos, Jacek Rabkowski, Jang-Kwon Lim, Mietek Bakowski, Lennart Ängquist, and Hans-Peter Nee. "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 with the JFETs conducting in the negative direction, leaving the possibility to use the body diode during the switching transients. Experimental waveforms for the SiC submodule verify the feasibility during normal steady-state operation. The loss estimation shows that a 300 MW M2C for high-voltage direct current transmission would potentially have an efficiency of approximately 99.8% if equipped with future 3.3 kV 1.2 kA SiC JFETs.
© 2011 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.QC 20111220
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Hassan, Bakri. "Current fed multilevel converters for high current power applications." Thesis, University of Newcastle upon Tyne, 2016. http://hdl.handle.net/10443/3267.

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The majority of the worldwide installed power inverters today are voltage source inverters followed by current source inverters where the concluding decision lies with the performance of the applications besides the usual economic reasons. Recent active development in the current source inverter areas has seen the emerging of various generalized multilevel current source inverter topologies analogous to the existing multilevel voltage source inverter families. To date, the multilevel current source inverter families have been classified principally by the physical appearance of their basic structures and also by the number of current sources employed. The existing multilevel current source inverter topologies are unpopular for present applications due to reasons such as big sizes, high control complexity and low reliability; which circumstances are often associated to massive component counts and multiple requirements of current sources. Therefore, this research has been focused on the single-phase single-source generalized multilevel current source inverter for this apparent advantage; where this thesis proposed a novel generalized multilevel current-source inverter topology with the lowest component utilization while employing just a single current source. In addition, the proposed topology can conveniently achieved dc current balance with a simple low frequency switching strategy for the five- and nine-level current outputs. From comparison analysis, the proposed topology has significantly less number of components employed compared to the nearest topology, which implies low implementation cost. The experimental results verify the characteristics and performances of the proposed topology acquired by computer simulations.
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Sternberger, Ronny. "Analytical modelling and controller design of a multilevel STATCOM." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=25797.

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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 of its input energy to its output voltage wave shape. Thereby, it demands for intelligent power conversion techniques to facilitate the grid connection. One option is to improve and adapt an already existing, simple and reliable multilevel power converter technology, using smart control strategies. The proposed WECs to grid interconnection system consists of uncontrolled three-phase rectifiers, three-level boost converter(TLBC) or three-level buck-boost converter (TLBBC) and a three-level neutral point clamped (TLNPC) inverter. A new method for pulse delay control for the active balancing of DC-link capacitor voltages by using TLBC/TLBBC is presented. Duty-ratio and pulse delay control methods are combined for obtaining better voltage regulation at the DC-link and for achieving higher controllability range. The classic voltage balancing problem of the NPC inverter input, is solved efficiently using the above technique. A synchronous current compensator is used for the NPC inverter based grid coupling. Various results from both simulation and hardware testing show that the required power conditioning and power flow control can be obtained from the proposed multilevel multistage converter system. The entire control strategies are implemented in Xilinx Virtex 5 FPGA, inside National Instruments’ CompactRIO system using LabVIEW. A contour based dead-time harmonic analysis method for TLNPC and the possibilities of having various interconnection strategies of WEC-rectifier units to complement the power converter efforts for stabilizing the DC-link, are also presented. An advanced future AC2AC direct power converter system based on Modular multilevel converter (MMC) structure developed at Siemens AG is presented briefly to demonstrate the future trends in this area.
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Almaleki, Masoud. "Sliding mode observation of capacitor voltage in multilevel power converters." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/11846/.

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Smart power supply grids may be required to link future energy production and consumers. Multilevel converters are a building block for smart grids. There are several structures of multilevel converters, for example the Neutral Point Clamped (NPC), the Flying Capacitor Circuit and the Cascaded H-Bridge (CHB) converter. The modular structure of the CHB multilevel converter makes it one of the best options for smart grids. Using modular converter structures reduces production and maintenance costs. Implementation of efficient and fast controllers for multilevel converters requires accurate measurement of the voltages and currents for the system feedback loops. Knowledge of the DC link voltages is necessary to construct voltage control loops. In a typical CHB multilevel converter there are many DC links which means that a lot of voltage transducers maybe required. Voltage transducers at medium voltage are not easy to implement and add to system cost. This thesis presents an efficient way to observe the DC link voltages and hence eliminate the cost associated with voltage transducers. A “Sliding Mode Observer (SMO) using the Equivalent Control Method” has been chosen because of its robustness against system uncertainties. Simulation and practical work has been performed on a three-phase, three-cell multilevel converter to validate the use of this observer.
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Saleh, Kamel Subhi. "Sensorless Control of High Power Induction Motors Using Multilevel Converters." Thesis, University of Nottingham, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.523161.

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Jupin, Samuel. "Advanced Control of Multilevel Power Converters for Weak Grid Applications." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0210.

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Avec l’avènement des micros-réseaux incorporant les sources d’énergie renouvelable, un nouveau paradigme apparaît dans la distribution de l’électricité. Ces nouvelles architectures interfacent des consommateurs non contrôlés à des sources d’énergie intermittentes, plaçant de fortes contraintes sur les étapes de conversion, stockage et gestion de l’énergie.Les convertisseurs de puissance s’adaptent avec en particulier le développement des convertisseurs multiniveaux, qui supportent à composants égaux des puissances plus importantes que leurs prédécesseurs et assurent une meilleure qualité de l’énergie, mais dont le contrôle gagne en complexité.Du fait de leur nature hybride, le contrôle des convertisseurs de puissance est traditionnellement scindé en deux parties. D’un côté les objectifs continus liés à la fonction principale d’interfaçage des convertisseurs, de l’autre le pilotage des interrupteurs quantifiés qui le forment, la modulation.Dans ce contexte, les exigences croissantes en rendement, fiabilité, polyvalence et performance imposent un gain conséquent d’intelligence de l’ensemble de l’architecture de contrôle. Pour répondre à ces exigences, nous proposons de traiter à la fois les objectifs liés à la fonction d’interface des convertisseurs et ceux rattachés à leur nature avec un unique contrôleur. Cette décision implique d’incorporer la non-linéarité des convertisseurs de puissance au contrôleur. Une approche de Contrôle à Modèle Prédictif (MPC) a été retenue pour traiter cette non-linéarité ainsi que la diversité d’objectifs de contrôle qui accompagne les convertisseurs.L’algorithme développé combine la théorie des graphes, avec divers algorithmes comme ceux de Dijkstra et A* à un modèle d’état spécialisé pour les systèmes à commutation, formant ainsi un outil puissant et universel capable de manipuler et la nature discrète des interrupteurs de puissance et celle continue de son environnement. L’étude du modèle d’état utilisé pour les convertisseurs de puissance comme systèmes commutants conduit à des résultats concernant la stabilité et la contrôlabilité de ces systèmes.Le contrôleur obtenu est éprouvé en simulation, face à des cas d’applications variés : onduleur isolé ou connecté à un réseau, redresseur et convertisseur bidirectionnel. La même structure de contrôle est confrontée à chacune de ces situations pour trois topologies multi-niveaux : Neutral Point-Clamped, Flying Capacitor et Cascaded H-Bridge. La capacité d’adaptation du contrôleur est regroupée dans deux étapes : la prédiction, qui utilise le modèle du convertisseur, et la fonction de coût, qui traduit le cahier des charges en un problème d’optimisation résolu par l’algorithme. Changer de topologie implique de modifier le modèle, sans impact sur la fonction de coût, tandis que modifier cette fonction suffit à s’adapter aux différentes applications.Les résultats montrent que le contrôleur pilote directement les interrupteurs de puissance en fonction des objectifs. Les performances générales de cette structure unique sont comparables à celles des structures multiples utilisées pour chacun des cas étudiés, à l’exception notable du fonctionnement redresseur, où la rapidité et l’étendue des possibilités sont tout particulièrement intéressants.En conclusion, le contrôleur développé est capable de traiter un grand nombre d’applications, topologies, objectifs et contraintes. Alors que les modifications du cahier des charges ou des conditions de fonctionnement impactent souvent profondément les structures de contrôle linéaire, ces altérations ne modifient pas l’architecture du contrôleur MPC développé. Cela illustre la polyvalence de la solution proposée ainsi que son universalité, démontrée davantage par la capacité à s’adapter à des convertisseurs de puissance différents et sans modifications. Finalement, la complexité de la modulation est toute incluse dans la structure, offrant un gain de simplicité et de flexibilité au design du contrôle
With the progressive rise of the micro-grids incorporating renewable energy sources, a new electricity distribution paradigm is emerging. These new architectures interface uncontrolled consumers with intermittent energy sources, therefore imposing more stress on the conversion, storage and management of the energy.Power converters are adapting accordingly, in particular, with the development of multi-level converters, which allow higher power rates and better power quality than their predecessors with similar components, but whose control is becoming increasingly complex.Due to their hybrid nature, the control of power converters is traditionally split into two parts: on the one side, the continuous objectives related to the main interfacing function of the power converters, and, on the other side, the driving of their quantized power switches, known as the modulation strategy.In this context, the growing demands in efficiency, reliability, versatility and performance require a high level of intelligence of the complete control structure. To meet these requirements, the objectives of this research work are to address both the interfacing objectives and the inner driving of the converter into a single controller. This decision implies incorporating the non-linearity of power converters into the controller, equivalent to suppressing the traditional modulation block. Modulation is the traditional solution to linearize the inner operation of the converters. The Model Predictive Control (MPC) approach was chosen to handle the non-linearity and the diversity of control objectives that accompany power converters.The developed control algorithm combines graph theory, with Dijkstra, A* and other algorithms, with a special state-space model designed for switching systems to form a powerful universal tool capable of simultaneously manipulating the discrete and continuous nature of the converter and its environment. Switched state-space models are studied, leading to interesting results on stability and controllability concerning their application on power converters.The obtained controller is then tested in simulation, with various case studies: grid-connected and standalone inverter, rectifier and bidirectional operation. These situations are studied for three common multi-level topologies: Neutral Point-Clamped, Flying Capacitor and Cascaded H-Bridge. The exact same MPC structure is used for each and every one of the case studies, with adaptations of its internal behavior. This behavior is agglomerated in two functions: the prediction, containing the model of the converter, and the cost function, which translates the control requirements into the optimal problem solved by the algorithm. Changing the topology implies adjusting the model, without impacting the cost function, while modifying this function is sufficient to adapt to the different applications.The results show that the controller manages to directly drive the power switches according to the application, demonstrating a large variety of considerations and objectives. The overall performance of this unique structure is comparable to that of the multiple structures used for each of the studied cases, with the notable exception of rectifier operation mode, where the speed and range of possibilities are particularly interesting.In conclusion, the developed controller manages miscellaneous applications, topologies, objectives and constraints. While the traditional linear control structures have to change, often deeply, for different operation modes and control requirements, such modifications do not affect the control architecture of the designed MPC controller. This shows the versatility of the proposed solution and its universality, further demonstrated by its ability to adapt to different power converters without modifications. Finally, the complexity of the modulation is fully included in the structure, offering simplicity and flexibility to the control design
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Books on the topic "Multilevel Power Converters"

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Multilevel Converts for Industrial Applications. Taylor & Francis Group, 2013.

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Teodorescu, Remus, Kamran Sharifabadi, Lennart Harnefors, Staffan Norrga, and Hans Peter Nee. Design, Control, and Application of Modular Multilevel Converters for HVDC Transmission Systems. Wiley & Sons, Incorporated, John, 2016.

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Teodorescu, Remus, Kamran Sharifabadi, Lennart Harnefors, Hans-Peter Neeb, and Staffan Norrga. Design, Control and Application of Modular Multilevel Converters for HVDC Transmission Systems. Wiley & Sons, Limited, John, 2016.

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Teodorescu, Remus, Kamran Sharifabadi, Lennart Harnefors, Hans-Peter Neeb, and Steffan Norrga. Design, Control, and Application of Modular Multilevel Converters for HVDC Transmission Systems. Wiley & Sons, Limited, John, 2016.

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Teodorescu, Remus, Kamran Sharifabadi, Lennart Harnefors, Staffan Norrga, and Hans Peter Nee. Design, Control, and Application of Modular Multilevel Converters for HVDC Transmission Systems. Wiley & Sons, Incorporated, John, 2016.

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Teodorescu, Remus, Kamran Sharifabadi, Lennart Harnefors, Staffan Norrga, and Hans Peter Nee. Design, Control, and Application of Modular Multilevel Converters for HVDC Transmission Systems. Wiley & Sons, Incorporated, John, 2016.

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Institute Of Electrical and Electronics Engineers. IEEE 2745.1-2019 IEEE Guide for Technology of Unified Power Flow Controller Using Modular Multilevel Converter - Part 1: Functions. IEEE, 2019.

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Book chapters on the topic "Multilevel Power Converters"

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Dokić, Branko L., and Branko Blanuša. "Introduction to Multilevel Converters." In Power Electronics, 559–92. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09402-1_10.

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Meynard, Thierry, and Guillaume Gateau. "PWM Strategies for Multilevel Converters." In Power Electronic Converters, 243–85. Hoboken, NJ USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118621196.ch9.

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Loh, Poh Chiang, Yushan Liu, Haitham Abu-Rub, and Baoming Ge. "Z-Source Multilevel Inverters." In Impedance Source Power Electronic Converters, 194–225. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119037088.ch12.

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Tafti, Hossein Dehghani, Georgios Konstantinou, and Josep Pou. "Multilevel Converter-Based Photovoltaic Power Conversion." In Advanced Multilevel Converters and Applications in Grid Integration, 369–411. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119476030.ch16.

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Khan, Md Shafquat Ullah. "Multilevel Converter-based Wind Power Conversion." In Advanced Multilevel Converters and Applications in Grid Integration, 413–32. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119476030.ch17.

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Trabelsi, Mohamed, and Haitham Abu-Rub. "Grid Integration of Quasi-Z Source Based PV Multilevel Inverter." In Impedance Source Power Electronic Converters, 362–89. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119037088.ch19.

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Sadigh, Arash Khoshkbar, and S. Masoud Barakati. "Topologies and Control Strategies of Multilevel Converters." In Modeling and Control of Sustainable Power Systems, 311–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-22904-6_11.

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Islam, Md Rabiul, Youguang Guo, and Jianguo Zhu. "FPGA-Based Digital Switching Controller for Multilevel Converters." In Power Converters for Medium Voltage Networks, 153–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-44529-7_5.

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Islam, Md Rabiul, Youguang Guo, and Jianguo Zhu. "Design and Analysis of 11- and 33-kV Modular Multilevel Cascaded Converters." In Power Converters for Medium Voltage Networks, 227–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-44529-7_7.

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Roomi, Muhammad M. "Z-Source Inverter-Based Fuel Cell Power Generation." In Advanced Multilevel Converters and Applications in Grid Integration, 433–54. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119476030.ch18.

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Conference papers on the topic "Multilevel Power Converters"

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"PWM methods multilevel converters." In 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551). IEEE, 2004. http://dx.doi.org/10.1109/pesc.2004.1354741.

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Franz, G. A. "Multilevel simulation tools for power converters." In Applied Power Electronics Conference and Exposition. IEEE, 1990. http://dx.doi.org/10.1109/apec.1990.66362.

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"Multilevel converters for high power applications." In IECON 2008 - 34th Annual Conference of IEEE Industrial Electronics Society. IEEE, 2008. http://dx.doi.org/10.1109/iecon.2008.4758467.

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Hassanifar, Mahyar, V. M. Hrishikesan, Jun-Hyung Jung, Sattar Bazyar, Hamzeh Beiranvand, Thiago Pereira, Marius Langwasser, and Marco Liserre. "Modular Multilevel Converters Enabling Multibus DC Distribution." In 2023 IEEE 17th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG). IEEE, 2023. http://dx.doi.org/10.1109/cpe-powereng58103.2023.10227452.

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Iqbal, Atif, and Marif Daula. "Off – Grid Power Supply Solution for Portable Cabins using Solar PV System for Qatar." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2021. http://dx.doi.org/10.29117/quarfe.2021.0008.

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In this project, a new system for power supply for remote areas has been proposed. In the proposed system, solar PV based system with battery storage for stand-along application has been discussed. In addition, the use of a multilevel inverter and high-gain DC/DC converter has been proposed. The proposed multilevel inverter generates a nine-level output voltage waveform with quadruple voltage gain. The proposed DC/DC converter is based on the concept of a switched-inductor with voltage lift switched-capacitor and has been verified for a voltage gain of 20. The experimental results confirmation the satisfactory performance for stand-alone applications of the proposed converters.
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Eshwiage, Ahmed, Suleiman M. Sharkh, and Sara Bouguerra. "Power Loss Analysis in Modular Multilevel Converters." In 2019 International Aegean Conference on Electrical Machines and Power Electronics (ACEMP) & 2019 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM). IEEE, 2019. http://dx.doi.org/10.1109/acemp-optim44294.2019.9007179.

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"Modeling and Control of Multilevel Converters." In 2018 IEEE 18th International Power Electronics and Motion Control Conference (PEMC). IEEE, 2018. http://dx.doi.org/10.1109/epepemc.2018.8521969.

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de Sousa, Gean J. M., and Marcelo L. Heldwein. "Concentrated submodules model for modular multilevel converters." In 2017 IEEE Southern Power Electronics Conference (SPEC). IEEE, 2017. http://dx.doi.org/10.1109/spec.2017.8333622.

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Biswas, Suvankar, and David Reusch. "Evaluation of GaN Based Multilevel Converters." In 2018 IEEE 6th Workshop on Wide Bandgap Power Devices and Applications (WiPDA). IEEE, 2018. http://dx.doi.org/10.1109/wipda.2018.8569122.

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Schon, Andre, and Mark-M. Bakran. "Comparison of modular multilevel converter based HV DC-DC-converters." In 2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe). IEEE, 2016. http://dx.doi.org/10.1109/epe.2016.7695259.

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Reports on the topic "Multilevel Power Converters"

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Erickson, R., S. Angkititrakul, and K. Almazeedi. New Family of Multilevel Matrix Converters for Wind Power Applications: Final Report, July 2002 - March 2006. Office of Scientific and Technical Information (OSTI), December 2006. http://dx.doi.org/10.2172/897520.

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