Tesis sobre el tema "Modular multilevel"
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Elgenedy, Mohamed Atef. "High-voltage pulse generators incorporating modular multilevel converter sub-modules". Thesis, University of Strathclyde, 2018. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=29620.
Texto completoZabihinejad, Amin. "Optimal sizing of modular multilevel converters". Doctoral thesis, Université Laval, 2017. http://hdl.handle.net/20.500.11794/27918.
Texto completoIn the last decades, power electronics has penetrated high power applications in many areas of the electrical industry. After the emergence of high-voltage semiconductor switch technologies these applications also required advances in the field of static converter topologies: The main challenges were to achieve voltage levels compatible with the application power domain, to increase the apparent switching frequency at the output, to increase the control bandwidth, to reduce the size of the elements of filtering and of limiting the current harmonics injected into the supply network. The topologies of multi-level modular converters (MMC) are based on this research problem: they enable the use of switching cells to achieve high power levels that can be used with existing switch technologies, frequencies and switching losses of the elementary switches while controlling the total harmonic distortion (THD). Modularity, redundancy, degrees of freedom and MMC functionality also allow them to increase fault tolerance. They now penetrated a wide range of applications, such as high-voltage DC (HVDC), renewable energy systems, high-speed variable speed drives, rail and marine traction, and very specific applications in terms of dynamic performance such as electromagnet power systems in particle accelerators. MMC topologies are composed of elementary switching cells using electronic switches such as the standard Integrated Control Thyristor (IGCT) or the latest generation of IGBTs. MMC converters have been the subject of extensive research and development work on topologies, modeling, and calculation of steady-state and transient operation, loss calculation, the harmonic content of electrical quantities and systems control and regulation functions. On the other hand, the dimensioning methodology of these structures is rarely addressed in the published works. Like most static converter topologies, MMC converters are composed not only of switches but also passive components of energy storage devices (capacitors) and magnetic (inductors, couplers) that are essential to ensure the conversion of the input and output electrical quantities. These components have a strong influence on the size, the volume and the efficiency of the converters and the optimal dimensioning of the latter often result from a compromise between the size of the passive components, the frequency and the power switchable by the elementary switches. The research presented in this thesis concerns the development of an optimal and comprehensive design methodology for MMCs integrating active and passive components, respecting the constraints of the application specifications and maximizing certain performance objectives. This methodology is used to analyze the various trade-off between the overall efficiency of the converter and its mass, or even its volume. These various scenarios can also be translated into cost if the user has the price of the available components. Various competing solutions using a specific number of cells adapted to switches with different characteristics in terms of voltage, current, and associated losses can thus be compared on the basis of identical input-output specifications. The methodology is applied to the dimensioning of an MMC converter used as an active front-end (AFE) input of a high-power pulsed solenoid power supply. In the first part, a fast, precise and generic method for calculating the steady-state model of MMC converter is developed. It has the particularity of taking into account the switching frequency as opposed to conventional approaches using modeling in mean values. This tool is very useful in evaluating the harmonic content that is constrained by the specifications, it is the heart of the design environment of the converter. Unlike conventional converters, there are circulation currents in MMC converter structure that make it complex to analyze. The inductors which are used in the arms of the topology are generally bulky and expensive in terms of volume and mass. It is common to use coupled inductors to reduce ripple, THD, and mass. In the presented work, an equivalent circuit of coupled inductances considering the saturation effect is developed and integrated. The use of coupled inductors increases the complexity of the analysis and the precision of its sizing method is critical for the overall optimization of the converter. An analytical model for the dimensioning of these components has been developed and integrated as well as a higher complexity model which uses the finite element method calculation. The proposed optimal and global design methodology uses a nonlinear optimization procedure with constraints that drive the steady-state computing tool, multi-level design models of passive component complexity, and other modules to quantify the fault state. To compensate the low precision of the analytical models, a hybrid optimization approach is also implemented. In the hybrid optimization loop, the inductance-sizing model can be corrected by the higher complexity model that uses finite element computation. A better compromise is thus obtained between the precision of the optimal results and convergence time of the iterative global optimization method.
Moberg, William. "Modular Multilevel Converters for Heavy Trucks". Thesis, Linköpings universitet, Elektroniska Kretsar och System, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-167760.
Texto completoPicas, Prat Ricard. "Control and modulation of modular multilevel converters". Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/404612.
Texto completoLa integració de fonts d’energia renovables a la xarxa elèctrica està reduint la nostra dependència dels recursos fòssils. Però per tal d’assegurar la viabilitat i fiabilitat de la generació d’energia distribuïda, fan falta convertidors estàtics més eficients i de més potència. El convertidor multinivell modular (MMC) és una topologia de convertidor multinivell recent, molt prometedora per aplicacions de mitja i alta potència, com són els sistemes de transmissió d’energia en corrent continua o els accionaments de motors d’alta potència. Els principals avantatges del MMC són modularitat, escalabilitat en tensió i potència, redundància i gran qualitat de la tensió i corrent de sortida. El funcionament del MMC, però, és complex i encara hi ha alguns problemes que s’han d’investigar amb més profunditat. Un dels problemes és l’arrissat de tensió del condensador de sub-mòdul (SM). L’arrissat de tensió defineix el valor mínim d’aquests condensadors i per tant, el seu cost. L’ús d’un corrent circulant adequat pot reduir l’arrissat de tensió. En aquesta tesi es presenten tres tècniques per calcular la consigna del corrent circulant: dues tècniques basades en funcions d’optimització que minimitzen l’arrissat de tensió i una tècnica d’aplicació més simple, la qual proporciona resultats pròxims als òptims però que es pot calcular més ràpidament. L’arrissat de tensió també es pot reduir afegint un component homopolar en els senyals de modulació. En aquesta tesi es proposa per primera vegada l’ús de la modulació discontinua per al MMC. Aquesta tècnica, basada en la injecció d’un component homopolar, permet una gran reducció de l’arris s at de tens ió i de les pèrdues de commutació. Les aplicacions reals del convertidor MMC es componen per un gran nombre de SMs. Això implica un repte en el disseny del sistema de control, particularment en l’etapa d’adquisició de dades. Aquesta tesi presenta un nou sistema de mesura per a les tensions dels condensadors de SM, en el qual es necessiten pocs sensors. A partir de la tensió de sortida d’un grup de sensors, el sistema pot adquirir la tensió de cada un d’ells. Com que l’adquisició no es pot fer a cada període de mostreig, entre adquisicions la tensió es calcula mitjançant un algoritme d’estimació. Un dels requisits de les aplicacions industrials és la fiabilitat. L’estructura del MMC permet l’ús de SMs redundants, però les fallades s’han de detectar i localitzar per tal de desactivar el component erroni. En aquesta tesi es presenta un sistema ràpid i robust de detecció, localització i correcció de fallades en SMs i sensors de tensió. El sistema es basa en l’ús de tres sensors addicionals per semi-branca, els quals mesuren la tensió de sortida d’un grup de SMs i la comparen amb la tensió esperada. A causa de la tolerància o l’envelliment dels condensadors , poden aparèixer diferències en la capacitat dels SMs. Aquestes diferències causen una mala distribució de les pèrdues dels semiconductors, incrementant l’estrès tèrmic d’alguns dels components i la probabilitat de fallada. Per això, es proposa un algoritme d’equilibrat de pèrdues, el qual iguala les pèrdues dels SMs i n’evita la concentració en algun SM. En aquesta tesi també s’ha estudiat l’aplicació del MMC en accionaments de motors. El funcionament del MMC a baixa velocitat/freqüència del motor és un repte encara no resolt, ja que l’arrissat de tensió dels condensadors és inversament proporcional a la freqüència del corrent. Aquesta tesi demostra que la modulació discontinua es pot utilitzar per reduir l’arrissat de tensió en aquesta situació, aconseguint un bon funcionament a molt baixa velocitat. En comparació amb altres tècniques actuals de baixa velocitat, la modulació discontinua aconsegueix un arrissat de tensió similar i una reducció de les pèrdues. Totes les tècniques proposades en aquesta tesi s’han estudiat mitjançant simulació en l’entorn MATLAB/Simulink i s’han corroborat experimentalment en prototips de laboratori.
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.
Texto completoLa 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
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.
Texto completoAntonopoulos, Antonios. "Control, Modulation and Implementation of Modular Multilevel Converters". Licentiate thesis, KTH, Elektriska maskiner och effektelektronik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-34188.
Texto completoThis thesis deals with the analysis and control of the modular multilevel converter (M2C). The M2C is a promising converter technology for various high-voltage high-power applications. The reason to this is that low-distortion output quantities can be achieved with low average switching frequencies per switch and without output filters. With the M2C the output voltage has such a low harmonic content that high-power motors can be operated without any derating. However, the apparent large number of devices, requires more complex converter control techniques than a two-level counterpart. The internal control of an M2C must be designed so that the submodule capacitor voltages are equalized and stable independent of the loading conditions. An active submodule selection mechanism, included in the modulator, has been shown able to provide voltage sharing inside the converter arm. Apart from the individual capacitor voltage sharing, a strategy has to be designed to ensure that the total amount of energy stored inside the converter will always be controlled. Based on an analytical description of the converter, both feedback and open-loop control methods are suggested, simulated and experimentally evaluated, which will ensure stable operation in the whole operation range. The potential interaction of the internal controllers with an external motor current controller is also investigated. Both simulation and experimental results show that any interaction will not result in any problems neither for the converter nor for the motor control itself. A hardware implementation of a down-scaled 10 kVA three-phase laboratory prototype converter is performed, in order to evaluate the modeling and the controllers developed. The controller implementation is described in detail, as it exhibits remarkably fast response, and can be expanded up to an arbitrary number of levels. Therefore it can be used even by a full-scale converter implementation in the MW range.
QC 20110628
Peftitsis, Dimosthenis, Georg Tolstoy, Antonios Antonopoulos, Jacek Rabkowski, Jang-Kwon Lim, Mietek Bakowski, Lennart Ängquist y 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.
Texto completo© 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
Goncalves, Jorge. "Thermal regulation and balancing in modular multilevel converters". Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/109594/.
Texto completoViatkin, Aleksandr <1988>. "Modular Multilevel Converters With Interleaved Half-Bridge Submodules". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10062/1/thesis.pdf.
Texto completoSchmitt, Daniel [Verfasser]. "Modular Multilevel Converter M2C für Multiterminal HVDC / Daniel Schmitt". Aachen : Shaker, 2012. http://d-nb.info/1053903723/34.
Texto completoNajmi, Vahid. "Modeling, Control and Design Considerations for Modular Multilevel Converters". Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/53703.
Texto completoMaster of Science
Džonlaga, Bogdan. "Contribution to the sizing of the modular multilevel converter". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS297/document.
Texto completoThe modular multilevel converter is a suitable solution for HVDC grids thanks to its modularity, low switching frequency and quasi-sinusoidal AC voltage. However, due to its topology, its mathematical model is quite complex and is therefore often simplified at the design stage. In particular, the arm equivalent resistance R, the arm inductance L and the circulating current are often neglected. But experimental results obtained with our 1-ph 6-level full-bridge MMC prototype showed that these hypotheses are not always acceptable. In this context, the goal of this thesis is to study the impact of accounting for R, L and the circulating current on the module capacitor voltage and on the operating area of the converter. First, we extended the commonly used integral based model and we clarified the hypotheses behind it. Among others, expressions for the circulating and dc currents have been developed and compared with the one that can be found in the literature. It allowed us to analyze the module capacitor voltage ripple as a function of R and L, without circulating current only. Second, to overcome the limitations of the integral based model, we proposed to use a steady state time invariant (DeltaSiga) MMC model in dq0 frame. Only few hypotheses are required to obtain this model, but a numerical evaluation is required. It allowed us to analyze the module capacitor average voltage and the module capacitor voltage ripple as a function of R and L, with and without circulating current. Third, using the steady state time invariant model, we developed a detailed PQ diagram of the MMC. In addition to the conventional AC current limit, DC current limit and modulation index limit, we added several internal limits: IGBT current, arm rms current and module capacitor voltage and current ripple. The results have been confirmed by numerical simulation using a detailed Matlab Simulink SimPowerSystems model. The results presented in this thesis could be used to optimize the sizing of the components of the MMC considering its operating area, and to assess the impact of different parameters on the MMC performance
Quraan, Mahran. "Modular multilevel converter with embedded battery cells for traction drives". Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6653/.
Texto completoIlves, Kalle. "Modeling and Design of Modular Multilevel Converters for Grid Applications". Doctoral thesis, KTH, Elektrisk energiomvandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153762.
Texto completoQC 20141010
Yu, Jianghui. "DC Fault Current Analysis and Control for Modular Multilevel Converters". Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/78054.
Texto completoMaster of Science
Yuan, Tang. "Modular multilevel converter : submodule dimensioning, testing method, and topology innovation". Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/77862/.
Texto completoSánchez, Sánchez Enric. "Energy-based control schemes of Modular Multilevel Converters for HVDC applications". Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/670894.
Texto completoL'alta tensió en corrent continu (HVDC) és una tecnologia basada en electrònica de potència que permet la transmissió de gran potència en distàncies llargues, la integració de parcs eòlics marins remots a la xarxa terrestre, i la interconnexió de sistemes asíncrons de corrent altern. El convertidor modular multinivell (MMC) és la tecnologia més recent per aplicacions HVDC basada en convertidors en font de tensió (VSC). Comparat amb el convertidor de dos nivells, l'MMC presenta un esquema de control més complex, però aporta una major flexibilitat al sistema. Aquest treball es centra en el control dels MMC per aplicacions HVDC, amb l'objectiu d'entendre els graus de llibertat addicionals relacionats amb la seva energia interna. En primer lloc, s 'estudia el control de l'MMC per aplicacions de control de tensió contínua en enllaços punt a punt. Després, es realitza una validació experimental mitjançant un enllaç punt a punt a escala, posant l'èmfasi en el disseny d'un emulador de cable HVDC. D'aquesta manera, els resultats de les simulacions es poden contrastar amb els experiments de laboratori. A continuació, es presenta una estratègia de control genèrica i el càlcul òptim dels seus paràmetres amb diferents mètodes. Així doncs, els guanys més adequats pels controladors s'obtenen automàticament, basats en un conjunt de restriccions sobre el sistema. En aplicacions HVDC com els grans parcs eòlics marins o els sistemes aïllats amb poca o cap generació síncrona, un o diversos convertidors han de generar la xarxa d'alterna. En aquest treball s'investiga el rol de l'energia interna de l'MMC, implementant diferents estructures de control. Finalment, es considera una xarxa HVDC multiterminal, en la qual un conjunt de convertidors controla la tensió contínua i d'altres formen la xarxa d'alterna. En aquest escenari, es planteja el disseny del control distribuït de tensió contínua
Amankwah, Emmanuel K. "A parallel hybrid modular multilevel converter for high voltage DC applications". Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13845/.
Texto completoLópez, Cañón Andres Mauricio [Verfasser]. "Model predictive control of modular multilevel converters / Andres Mauricio López Cañón". Paderborn : Universitätsbibliothek, 2018. http://d-nb.info/1167856503/34.
Texto completoLi, Chen. "State Space Modeling and Power Flow Analysis of Modular Multilevel Converters". Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71811.
Texto completoMaster of Science
Lyu, Yadong. "Modeling and Control Strategy for Capacitor Minimization of Modular Multilevel Converters". Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/75111.
Texto completoMaster of Science
Abushafa, Osama Alshebani Mohamed. "Measurement schemes with reduced number of sensors for modular multilevel converter". Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3866.
Texto completoOghorada, Oghenewvogaga. "Modular multilevel cascaded flying capacitor STATCOM for balanced and unbalanced load compensation". Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/18372/.
Texto completoDiaz, Matias. "Control of the modular multilevel matrix converter for wind energy conversion systems". Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/47157/.
Texto completoDíaz, Díaz Matías David. "Control of the modular multilevel Matrix converter for wind energy conversion systems". Tesis, Universidad de Chile, 2017. http://repositorio.uchile.cl/handle/2250/147484.
Texto completoLa potencia nominal de los Sistemas de Conversión de Energía Eólica se ha incrementado constantemente alcanzando niveles de potencia cercanos a los 10 MW. Por tanto, convertidores de potencia de media tensión están reemplazando a los convertidores Back-to-Back de baja tensión habitualmente empleados en la etapa de conversión de energía. Convertidores Modulares Multinivel se han posicionado como una solución atractiva para Sistemas de Conversión de Energía Eólica de alta potencia debido a sus buenas prestaciones. Algunas de estas prestaciones son la capacidad de alcanzar altos voltajes, modularidad y confiabilidad. En este contexto, esta tesis discute la aplicación del Convertidor Modular Matricial Multinivel para conectar Sistemas de Conversión de Energía Eólica de alta potencia. Los modelos matemáticos y estrategias de control requeridas para esta aplicación son descritos y discutidos en este documento. Las estrategias de control propuestas habilitan una operación desacoplada del convertidor, proporcionando seguimiento del máximo punto de potencia en el lado del generador eléctrico del sistema eólico, cumplimiento de normas de conexión en el lado de la red eléctrica y regulación de los condensadores flotantes del convertidor. La efectividad de las estrategias de control propuestas es validada a través de simulaciones y experimentos realizados con un prototipo de laboratorio. Las simulaciones se realizan con un Sistemas de Conversión de Energía Eólica de 10 MW operando a 6.6 kV. Dicho sistema se implementa en el software PLECS. Por otro, se ha desarrollado un prototipo de laboratorio de 6kVA durante el desarrollo de este proyecto. El prototipo de laboratorio considera un Convertidor Modular Matricial Multinivel de 27 módulos Puente-H . El sistema es controlado empleando una plataforma de control basada en una Digital Signal Processor conectada a tres tarjetas del tipo Field Programmable Gate Array que proveen de 50 mediciones análogo-digital y 108 señales de disparo. La entrada del convertidor es conectada a una fuente programable marca Ametek que emula el comportamiento de la turbina eólica. A su vez, la salida del convertidor es conectada a otra fuente programable con capacidad de producir fallas en la tensión. Los resultados obtenidos, tanto en el prototipo experimental como en simulación, confirman la operación exitosa del Convertidor Modular Matricial Multinivel en aplicaciones eólicas de alta potencia. En todos los casos, las estrategias de control propuestas aseguran regulación de la tensión en los condensadores flotantes, seguimiento del máximo punto de potencia en el lado del generador eléctrico del sistema eólico y cumplimiento de normas de conexión en el lado de la red eléctrica.
The nominal power of single Wind Energy Conversion Systems has been steadily growing, reaching power ratings close to 10MW. In the power conversion stage, medium-voltage power converters are replacing the conventional low-voltage back-to-back topology. Modular Multilevel Converters have appeared as a promising solution for Multi-MW WECSs due to their characteristics such as modularity, reliability and the capability to reach high nominal voltages. Thereby, this thesis discusses the application of the Modular Multilevel Matrix Converter (\mc) to drive Multi-MW Wind Energy Conversion Systems (WECSs). The modelling and control systems required for this application are extensively analysed and discussed in this document. The proposed control strategies enable decoupled operation of the converter, providing maximum power point tracking capability at the generator-side, grid-code compliance and Low Voltage Ride Through Control at the grid-side and good steady state and dynamic performance for balancing the capacitor voltages of the converter.\\ The effectiveness of the proposed control strategies is validated through simulations and experimental results. Simulation results are obtained with a 10MW, 6.6 kVM3C based WECS model developed in PLECS software. Additionally, a 5 kVA downscale prototype has been designed and constructed during this Ph.D. The downscale prototype is composed of 27 H-Bridges power cells. The system is controlled using a Digital Signal Processor connected to three Field Programmable Gate Array which are equipped with 50 analogue-digital channels and 108 gate drive signals. Two programmable AMETEK power supplies emulate the electrical grid and the generator. The wind turbine dynamics is programmed in the generator-side power supply to emulate a generator operating in variable speed/voltage mode. The output port of the M3C is connected to another power source which can generate programmable grid sag-swell conditions. Simulation and experimental results for variable-speed operation, grid-code compliance, and capacitor voltage regulation have confirmed the successful operation of the \mc{} based WECSs. In all the experiments, the proposed control systems ensure proper capacitor voltage balancing, keeping the flying capacitor voltages bounded and with low ripple. Additionally, the performance of the generator-side and grid-side control system have been validated for Maximum Power Point Tracking and Low-Voltage Ride Through, respectively.
Nwobu, Chigozie John. "Control of a modular multilevel flying capacitor based STATCOM for distribution systems". Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/15429/.
Texto completoZeng, Rong. "Design, analysis and operation of hybrid modular multilevel converters for HVDC applications". Thesis, University of Strathclyde, 2015. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=25404.
Texto completoGebreel, Abd Almula G. M. "POWER CONVERSION FOR UHVDC TO UHVAC BASED ON USING MODULAR MULTILEVEL CONVERTER". The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429358686.
Texto completoEspinoza, Bolaños Mauricio Antonio. "Control systems for high-power medium-voltage modular multilevel converter-based drives". Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/168418.
Texto completoHoy en día, la construcción de maquinaria y plantas industriales exigen soluciones de accionamiento con un diseño flexible y escalable. En sectores industriales como la petroquímica, la minería, la generación de energía, etc., existe una demanda de soluciones con alta eficiencia, seguridad integrada y respaldo de las compañías proveedoras. En este contexto, el Convertidor Multinivel Modular (MMC) ha aparecido como una opción prometedora para accionamientos de media tensión de alta potencia debido a sus características, como modularidad total, flexibilidad de control, niveles de media tensión, calidad de potencia y posible operación sin transformador. Por lo tanto, esta tesis discute la aplicación del MMC para accionamientos de máquinas. El modelado del MMC y sus sistemas de control asociados para esta aplicación son analizados ampliamente en este documento. Específicamente, se ha propuesto un nuevo modelado basado en coordenadas dq y su sistema correspondiente sistema de control para regular el valor instantáneo de las tensiones de los condensadores del MMC. Además, se ha propuesto la integración de los sistemas de control de la máquina y del MMC para mejorar el rendimiento general del sistema. Por ejemplo, se demostró que las corrientes circulantes requeridas durante bajas frecuencias ac se reducen al considerar la interacción de ambos sistemas de control. La efectividad de las estrategias de control propuestas se validó a través de extensos resultados experimentales, que se han publicado en dos artículos (IEEE Transactions on Industrial Electronics) y seis artículos de conferencia (indexados en la base de datos Scopus), así como contribuciones importantes en otros proyectos relacionados con el control de convertidores multinivel modulares. El prototipo utilizado se compone de 18 celdas de potencia. El sistema se controla utilizando un procesador de señales digitales y dos FPGAs. Un segundo MMC con 12 celdas de potencia también se usó para algunas pruebas, conformando una unidad Back-to-Back MMC. Se probó el rendimiento dinámico y en estado estable de las metodologías de control propuestas, considerando el arranque del MMC, cambios escalón tanto en el par y las corrientes de magnetización, rampas de velocidad, pruebas de cruce por velocidad cero, operación de rotor bloqueado, operación con flujo debilitado, diferentes condiciones de carga, manipulación de la tensión dc del MMC, etc. En todos los casos, el rendimiento alcanzado es consistente con los resultados esperados. Nowadays, machinery and plant construction are demanding drive solutions with flexible and scalable design. In industrial sectors such as petrochemical, mining, power generation, etc., there is a demand for solutions with high efficiency, integrated safety and support from the supplier companies. In this context, the Modular Multilevel Converter (MMC) has appeared as a promising option for high-power medium-voltage drives due to their characteristics, such as full modularity, control flexibility, medium-voltage levels, power quality and possible transformer-less operation. Thereby, this thesis discusses the application of the MMC as a machine drive. The modelling and control systems required for this application are extensively analysed and discussed in this document. Specifically, a novel dq-based modelling of the MMC and its associated control system has been proposed to regulate the instantaneous value of the MMC capacitor voltages. Additionally, the integration of the machine and MMC control systems has been proposed to enhance the performance of the overall system. For example, it was demonstrated that the required circulating currents during low-ac frequencies are reduced by considering the interaction of both control systems. The effectiveness of the proposed control strategies is validated through extensive experimental results, which have been published in two journal papers (IEEE Transaction on Industrial Electronics) and six conference papers (indexed in the Scopus database), as well as important contributions in other projects related to the control of modular multilevel converters. The downscaled prototype utilised is composed of 18 power cells. The system is controlled using a Digital Signal Processor and two Field Programmable Gate Arrays (FPGAs). A second MMC with 12 power cells was also used for some tests, conforming a Back-to-Back MMC-based drive. The dynamic and steady-state performance of the proposed control methodologies were tested, considering the MMC starting-up, step changes in both the torque and magnetising currents, speed-ramps, zero-speed crossing test, rotor-locked operation, flux-weakening operation, different loading conditions, manipulation of the input voltage of the MMC, etc. In all cases, the achieved performance is consistent with the expected results.
Cúnico, Lucas Mondardo. "Estudo do conversor modular multinível". Universidade do Estado de Santa Catarina, 2013. http://tede.udesc.br/handle/handle/1863.
Texto completoCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
The modular multilevel converter emerged as a new topology of multilevel converters, being introduced in 2002. The advantages of this topology are related to its modularity and scalability. This work presents the study and implementation of this converter, which includes the presentation of the main methods of modulation and voltage balancing of the foating capacitors and startup. The used modulation in modeled using switching functions, its allow one minimize the current ripple at system inductor due the correct selection of carriers shift angles. Moreover a current control and voltages equalization methodology are proposed. It is performed dynamic modeling and quantitative analysis of the converter and it is derived a design methodology. This methodology is used to design and build a 3 kVA prototype with bus voltage of 800 V. The results include transient analyses, efficiency, voltage charging and steady state.
O conversor modular multinível emergiu como uma nova topologia de conversores mutiníveis, sendo introduzido a partir de 2002. As vantagens desta topologia estão relacionadas a sua modularidade e escalabilidade. Este trabalho apresenta o estudo e implementação deste conversor, o que inclui a apresentação das principais metodologias de modulação e equilíbrio da tensão e pre-carga dos capacitores flutuantes. Apresenta-se um estudo da modulação por meio de funções de chaveamento que permite a minimização da ondulação de corrente nos indutores por meio da escolha adequada dos ângulos de defasagem das portadoras empregadas. Para que o projeto da estrutura seja possível, e realizada a modelagem dinâmica e a analise quantitativa do conversor em diferentes condições de operação, sendo derivada uma metodologia de projeto. Esta metodologia de posta a prova com a construção de um protótipo de 3 kVA com tensão de barramento de 800 V. Os resultados obtidos do protótipo incluem avaliações transitórias, verificação do rendimento, pre-carga e operação em regime.
Antonopoulos, Antonios. "On the Internal Dynamics and AC-Motor Drive Application of Modular Multilevel Converters". Doctoral thesis, KTH, Elektrisk energiomvandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156200.
Texto completoDenna avhandling är ett försök att undersöka drift och egenskaper avmodulära multinivåomvandlare (M2C:er). Eftersom denna topologi anses varaden mest lovande inom högspänings-högeffekt-tillämpningar är, och somett underlag för att kunna formulera lämpliga styrmetoder, är det nödvändigtatt lägga kraft i att försöka förståde fysikaliska lagar som styr den inredynamiken i sådana omvandlare. Även om M2C:erna tillhör den välstuderadefamiljen av spänningsstyva omvandlare (VSC:er), och har en modulärstruktur, är deras reglering avsevärt mer komplicerad jämfört med två- ellertre-nivåomvandlare, eftersom ett mycket större antal switchar och kondensatorerär nödvändiga i en sådan topologi. Denna avhandling sätter fingretpå de parametrar som måste beaktas när man konstruerar regleringen för enM2C, genom att analysera den interna dynamiken, samt att föreslå sätt attstyra sådana omvandlare såatt stabil drift kan säkerställas utan att negativtpåverka prestanda.Ett speciellt fokus läggs på växelströmsmotordrifter eftersom de är särskiltutmanande vad gäller prestanda. Växelverkan mellan den interna dynamikenoch motorns dynamik undersöks experimentellt. Problemet att driva motornvid stillestånd behandlas även i fallet med hög ström och högt moment för atterhålla kunskap om kraven påomvandlaren i sådana fall. Slutligen föreslås enoptimering av omvandlarens drifttillstånd för att undvika överdimensioneringav omvandlarens komponenter i de fall detta är möjligt.Alla analytiska undersökningar som läggs fram i denna avhandling är bekräftadegenom experimentella resultat från en laboratorieomvandlare, somutvecklats inom ramen för detta arbete. Den experimentella verifieringen bevisargiltigheten av alla teoretiska undersökningar. Den visar också på demycket goda prestanda som de utvecklade styrmetoderna har vid drift aven verklig fysisk omvandlare. Förhoppningen är att resultaten från detta arbetekan komma till använding i storskaliga implementerinar i mega- ellergiga-wattklassen.
QC 20141201
Huang, Han. "Analysis and control of modular multilevel cascaded converter-based flexible AC transmission systems". Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/22886/.
Texto completoCosta, de Oliveira Guacira. "Advances in multi-terminal HVDC transmission systems : nonlinear controllers for modular multilevel converters". Electronic Thesis or Diss., université Paris-Saclay, 2020. http://www.theses.fr/2020UPASG037.
Texto completoMMC is a very important topic in the context of high voltage direct-current transmission systems applications. This topology is suitable for several applications, as a result of smaller switching losses due to lower switching frequency, low alternating-current harmonic distortion, modular structure enabling scalability construction and practical maintenance. However, a more complex control strategy is required to control circulating current, to compensate the voltage imbalance between legs and voltage balancing of SM, such as to maintain SM's capacitors voltages constant. This thesis presents two nonlinear controllers for an MMC, able to control circulating currents, and the energy in the converter. First proposed controller is developed using Lyapunov theory, strongly based on singular perturbation and feedback linearization techniques. Second one is designed following bilinear theory based on quadratic feedback control. For both, a mathematical proof is given for its stability, which is based on Lyapunov's theory. This result provides asymptotic stabilization for the three-phases MMC. The use of a Lyapunov function implies a formal verification of stability and a broad region of attraction for the considered model. Both control techniques are developed by means of an average bilinear model and performances are verified by means of a detailed MMC switching model at Matlab Simscape Electrical environment. The evaluation includes active and reactive power reference variations, grid imbalance conditions, parameters uncertainties and even a comparison with a standard PI controller. Also, for the nonlinear controllers, it is studied the effect of control gains on the system's dynamics. The main thesis' contributions can then be stated as the two distinct nonlinear control algorithms, based on a bilinear mathematical model, designed for MMC converters; Both algorithms are able to control circulating currents and converter's energy at the switching MMC model; There are formal stability analysis by Lyapunov theory for these controllers; and once these proposed controllers are not based on a linearized model, a broad operation region is obtained
Conversor multinível modular é o tópico de interesse amplo e atual no contexto de aplicações de sistemas de transmissão de corrente contínua de alta tensão. Essa topologia é adequada para várias aplicações, como resultado de menores perdas de chaveamento, devido à menor frequência de comutação dos IGBTs, baixa distorção harmônica na corrente alternada, estrutura modular que permite escalabilidade na construção e manutenção prática. No entanto, é necessária uma estratégia de contrôle mais complexa para controlar a corrente circulante, para compensar o desequilíbrio de tensão entre as pernas e o equilíbrio de tensão dos sub-módulos, de forma a manter constantes as tensões dos capacitores dos sub-módulos. Esta tese apresenta dois controles não-lineares para conversores MMC, capazes de controlar correntes circulantes e a energia no conversor. O primeiro é projetado seguindo a teoria bilinear baseada no controle de feedback quadrático. O segundo controlador proposto é desenvolvido usando a teoria de Lyapunov, fortemente baseada em técnicas singular perturbation e feedback linearization. Para ambos, é definida uma prova matemática de sua estabilidade, baseada na teoria de Lyapunov. Este resultado fornece estabilização assintotica para as três fases MMC. O uso de uma função de Lyapunov implica uma verificação formal da estabilidade e uma região explícita de atração para o modelo considerado. Ambas as técnicas de controle são desenvolvidas por meio de um modelo médio bilinear e a robustez e o desempenho são verificados por meio de um modelo chaveado de conversores MMC nas simulações do Matlab Simscape Electrical. A avaliação inclui variações de referência de potência ativa e reativa, condições de desequilíbrio da rede, incertezas de parâmetros e até uma comparação com um controlador PI. Além disso, para os controladores não lineares, são estudados: o efeito do controle de ganho na dinâmica do sistema e no desempenho do controlador em caso de alteração no ponto de operação. As principais contribuições da tese são os dois algoritmos distintos de controle não-linear, baseados em um modelo matemático bilinear, projetados para conversores MMC; Ambos os algoritmos são capazes de controlar o equilíbrio de corrente circulante e a energia do conversor; Há uma análise formal de estabilidade pela teoria de Lyapunov para esse sistema; e uma vez que os controles propostos não se baseiam em um modelo linearizado, uma vasta região de operação é alcançável
Adams, Stephan Christopher. "Closed loop, co-operative, distributed, control of a multilevel modular cascade converter (MMCC)". Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/157714/1/Stephan_Adams_Thesis.pdf.
Texto completoAbdelsalam, Mahmoud Osama Mohammed Elwadie. "Capacitor voltage balancing, fault detection, and fault tolerant control techniques of modular multilevel converters". Thesis, Staffordshire University, 2016. http://eprints.staffs.ac.uk/2936/.
Texto completoWang, Puyu. "A multi-terminal modular multilevel converter-based HVDC system with an offshore wind farm". Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6442/.
Texto completoYin, Congqi. "Dynamic performance of voltage balancing and circulating current suppression control for modular multilevel converter". Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3765.
Texto completoNampally, Ashok. "Investigation of modulation dynamics and control of modular multilevel converter for high voltage DC grids". Thesis, University of Aberdeen, 2017. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=235573.
Texto completoChen, Chao. "Control of an H-bridge modular multilevel converter for reliable operation of DC transmission systems". Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=23515.
Texto completoBergna, Diaz Gilbert. "Modular Multilevel Converter Control for HVDC Operation : Optimal Shaping of the Circulating Current Signal for Internal Energy Regulation". Thesis, CentraleSupélec, 2015. http://www.theses.fr/2015SUPL0017/document.
Texto completoFollowing Europe’s 2020 growth program, the Energy Roadmap 2050 launched by the European Commission (EC) has officially set a long term path for a low-carbon economy, assuming a reduction of at least 80% of greenhouse gas emissions by the year 2050. Meeting such ambitious requirements will imply a major change in paradigm, including the electricity grid infrastructure as we know it.The breakthroughs in semi-conductor technology and the advances in power electronics topologies and control have added momentum to the on-going process of turning the SuperGrid into a reality. Perhaps the most recent breakthrough occurred in 2003, when Prof. Marquardt introduced the Modular Multilevel Converter (MMC or M2C) which is now the preferred power electronic topology that is starting to be used in VSC-HVDC stations. It does however, introduce a number of rather complex challenges such as “additional” circulating currents within the converter itself, causing extra losses and potentially unstable operation. In addition, the MMC will be required to properly balance the capacitive energy stored within its different arms, while transferring power between the AC and DC grids that it interfaces.The present Thesis project aimed to design adequate “high-level” MMC control strategies suited for HVDC applications, under balanced and unbalanced AC grid conditions. The resulting control strategy is derived with a “top-to-bottom” design approach, inherent to optimization strategies, where the desired performance of the MMC results in the control scheme that will be applied. More precisely, the Lagrange multipliers optimization methodology is used to calculate the minimal MMC circulating current reference signals in phase coordinates, capable of successfully regulating the capacitive arm energies of the converter, while reducing losses and voltage fluctuations, and effectively decoupling any power oscillations that would take place in the AC grid and preventing them from propagating into the DC grid
Venkatachari, Sidhaarth. "Application of Neural Networks to Inverter-Based Resources". Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103376.
Texto completoMaster of Science
Data analytics and machine learning play an important role in the power grids of today, which are continuously evolving with the integration of renewable energy resources. It is expected that by 2030 most of the electric power generated will be processed by some form of power electronics, e.g., inverters, from the point of its generation. Machine learning has been applied to various fields of power systems such as load forecasting, stability analysis, and fault diagnosis. This work extends machine learning applications to inverter-based resources by using artificial neural networks to perform controller emulation for an inverter, provide cybersecurity through heterogeneity, and perform submodule fault detection in modular multilevel converters. The thesis also discusses the step by step implementation of a neural network custom component in PSCAD/EMTDC software. This custom component simplifies the process of creating a neural network in PSCAD/EMTDC by eliminating the manual assembly of predefined library components.
Derviškadić, Arman. "Comparison of Different Methods to Measure Submodule Capacitor Voltages of Modular Multilevel Converters for HVDC Applications". Thesis, KTH, Elektrisk energiomvandling, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105826.
Texto completoJiang, Xu [Verfasser]. "Protection Schemes for Modular Multilevel Converter Based High Voltage Direct Current Transmission System Converters / Xu Jiang". Aachen : Shaker, 2019. http://d-nb.info/1188550845/34.
Texto completoJohnson, Jalen Craig. "High Power Density GaN Based Boost Inverter and Resonant Modular Multilevel Boost Converter for Automotive Applications". Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/28778.
Texto completoColmenares, Juan. "ANALYSIS, IMPLEMENTATION AND EXPERIMENTAL EVALUATION OF A PHASE SHIFTED PWM CONTROL SYSTEM FOR A MODULAR MULTILEVEL CONVERTER". Thesis, KTH, Elektrisk energiomvandling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-53658.
Texto completoPoyiadjis, Soteris. "A New Cell Bypass Arrangement and Control for Modular Multilevel Converters based on Thyristor Forced Commutation Circuit". Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-201660.
Texto completoHVDC transmission är ett fördelaktigt sätt att överföra eekt i jämförelse med ACtransmission. Omriktare har utvecklats för att passa applikationen, där ModularMultilevel Converters (MMC) har visat sig passa bra för HVDC på grund av de lågaförlusterna och dess obentliga krav på lter. Dessutom har de en direkt och snabbkontrollteori på både AC och DC sidan. Även om dess totala verkningsgrad är högreän hos six-pulse voltage source converter (VSC) men lägre än Line CommutatedConverter (LCC).Detta exjobb innefattar att minska ledningsförlusterna i MMCn. En ny designav cell strukturen föreslås, tillsammans med en passande kontrollteori. Idén äratt, på grund av dess lägre ledningsresistans använda tyristorer snarare än IGBTervilka annars är vanliga i MMCer, detta då kondensatorn är förbikopplad.. Dennya cellstrukturen testas initialt experimentellt i laboratorium och hela systemetvalideras genom simulering av en 3-fas MMC modell i PSCAD. De experimentellaresultaten bekräftade att den nya modellen fungerar och de simulerade resultatenvisar att den föreslagna topologin inte stör funktionen hos MMCn. En jämförelsemellan den nya topologin och den konventionella halvbridge strukturen har gjorts,där den föreslagna topologin hade lägre verkningsgrad. Istället har en generelltkoncept introducerats för att utlova en högre verkningsgrad än den först föreslagnatopologin.
Fehr, Hendrik. "matlab scripts: mmc periodic signal model". Technische Universität Dresden, 2021. https://tud.qucosa.de/id/qucosa%3A75460.
Texto completoWang, Jun. "Switching-Cycle Control and Sensing Techniques for High-Density SiC-Based Modular Converters". Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/83518.
Texto completoPh. D.
Simonite, Vanessa. "An application of multilevel modelling techniques to the longitudinal study of student progress in a modular degree course". Thesis, University College London (University of London), 2001. http://discovery.ucl.ac.uk/10007413/.
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