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Lega, Alberto <1977>. "Multilevel converters: dual two-level inverter scheme." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/411/.
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Patkar, Fazlli. "PWM techniques for control of dual-inverter supplied six-phase drives." Thesis, Liverpool John Moores University, 2013. http://researchonline.ljmu.ac.uk/4463/.
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Among the different multiphase ac drive solutions, one of the most widely reported in the literature is the six-phase machine. The machines can be realised into two different configurations, symmetrical and asymmetrical. For the symmetrical configuration, the stator winding consists of two sets of three-phase windings that are spatially shifted by 60 degrees where spatial displacement between any two consecutive phases is the same and equal to 60 degrees. For the asymmetrical configuration, the two sets of three-phase windings are spatially shifted by 30 degrees. As a result, the spatial shift between consecutive phases becomes non-equidistant. In this thesis, modulation techniques for both symmetrical and asymmetrical six-phase machines are investigated. The machines are configured in open-end winding configuration where both ends of the stator winding are connected to separate isolated inverters in a topology known as dual-inverter supply. Compared to conventional single-sided supply topology where one end of the winding is connected to an inverter while the other side is star-connected, some additional benefits are offered by the dual-inverter supply topology. First, fault tolerance of the drive is improved, since the supply is realised with two independent inverters. In case one of the inverters is faulted, the other can continue to provide power to the machine. Second, the same phase voltages can be achieved with half the dc-link voltages on the two inverter inputs compared to the single-sided supply, which can be useful in applications such as electric and hybrid electric vehicles and medium sized ships, where the dc voltage levels are limited. Further, due to the nature of the topology, additional diodes and capacitors like in the Neutral Point Clamped (NPC) and Flying Capacitor (FC) VSIs are not required. The latter results in a further advantage - capacitor voltage balancing techniques are not required. Two pulse width modulation (PWM) techniques for control of the dual-inverter supplied six-phase drives are proposed in this thesis. The first is a reference sharing algorithm where the inverters are modulated using reference voltage that is shared equally and unequally between the two modulators. For both symmetrical and asymmetrical six-phase drives, a better performance, in term of total harmonic distortion (THD) of phase voltage is obtained when the reference is shared unequally between the two modulators. The second technique is carrier-based modulation where the modulation of the two inverters is determined by the disposition of the carrier signals. Three variations of carrier signals disposition are investigated namely; the phase disposition (PD-PWM), alternate phase opposition disposition (APOD-PWM) and phase-shifted PWM (PS-PWM). For the symmetrical six-phase drive, the best phase voltage and current THDs are obtained using APOD-PWM while for asymmetrical six-phase drive, the APOD-PWM produces the worst current THD despite having the best voltage THD among the three methods. All the developed modulation techniques are analysed using simulations and experiments undertaken using a laboratory prototypes. The waveforms and spectra of phase voltage and load current obtained from the simulation and experimental works are presented in this thesis together with the THD of both the voltage and current over entire linear modulation range.
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Nieri, Elia. "Progetto e realizzazione di un azionamento "dual inverter" per macchine sincrone a riluttanza." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15034/.
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L'oggetto della tesi consiste nella progettazione e realizzazione di un azionamento Dual Inverter a singola alimentazione per il controllo di macchine elettriche sincrone a pura riluttanza con centro stella aperto. La configurazione dell'azionamento prevede l’utilizzo di un solo pacco batteria collegato al primo inverter, mentre il secondo è direttamente alimentato da un condensatore flottante posizionato sul rispettivo bus DC; in altre parole, tale struttura può essere vista come un sistema alimentato da un singolo inverter con l’aggiunta di un compensatore della potenza reattiva di macchina.
La configurazione studiata possiede le potenzialità per essere utilizzata sia in ambito automotive, che in applicazioni industriali. Tale sistema, oltre a migliorare lo sfruttamento del convertitore principale facendolo lavorare a fattore di potenza unitario, accresce il limite di tensione disponibile ai capi degli avvolgimenti della macchina a parità di tensione del pacco batterie e amplia la regione a coppia e a potenza costante, ritardando i deflussaggi per ottenere maggior coppia elettromagnetica ad elevate velocità.
L'elaborato realizzato prevede una caratterizzazione sperimentale della macchina elettrica utilizzata, allo scopo di realizzare un sistema di controllo ottimizzato e una comparazione analitica tra l’azionamento dotato di singolo inverter e quello dotato di compensatore della potenza reattiva, per la verifica delle basi teoriche presenti in letteratura. Tutto ciò è stato poi confermato attraverso simulazioni in ambiente Simulink e prove sperimentali eseguite mediante sistema di prototipazione rapida dSPACE.
L'azionamento è stato collaudato, testato e risulta essere funzionante per ogni valore del rapporto di tensione dei bus DC; dalle varie fasi del progetto sono stati ricavati risultati omogenei e concordi, che certificano l'efficienza del sistema e confermano la validità dei vantaggi dedotti dallo studio preliminare.
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Satiawan, I. Nyoman Wahyu. "Pulse width modulation control of dual-inverter supply for five-phase variable-speed drives." Thesis, Liverpool John Moores University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.585478.
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Three-phase multi-level topologies have been drawing increased attention in the past two decades. The numerous advantages of multi-level supply include: good power quality (low voltage distortion and dv/dt), good electromagnetic compatibility, operation with a lower switching frequency (lower switching losses), high voltage capability, smaller common mode (CM) voltage (reducing the stress in the motor bearings). There are various topologies of multilevel converters. The main ones are the neutral point clamped (NPC), the flying capacitor (FC) and the cascaded converters. Another alternative is the dual two-level inverter configuration supplying an open-end winding machine. This topology has received growing attention due to its simple structure. The open-end topology has the advantages that the additional diodes used in the neutral- point-clamped (NPC) voltage source inverter (VSI) are not needed, leading to a saving in the overall number of components. Furthermore, the issue of proper capacitor voltage balancing does not exist if the supply is two-level at each winding side. Application of such a dual-inverter supply (with equal DC-links) enables drive operation with voltage waveform equivalent to the one obtainable with a three-level VSI. The advantages of multi-phase variable speed drives over the three-phase ones are numerous and include an increase of fault tolerance, the possibility to have several multi-phase machines connected in series and drive them independently with a single VSI and, when the machine is equipped with a concentrated winding, other, higher harmonics can also be used to increase the developed torque. This thesis explores the possibility of combining the multi-phase and open-end- winding multi-level topologies. In particular the five-phase open-end-winding topology is considered. General properties of the five-phase AC motor drives with sinusoidal winding distribution are at first reviewed, along with the previously developed two- level space-vector modulation algorithm for a five-phase two-level VSI. A mathematical model of the converter is developed and a detailed study of the available switching states and corresponding voltage space vectors is conducted. It is shown that, due to the large number of switching states available in the topology together with the additional requirements when driving a multi-phase machine, the design of a suitable modulation scheme is extremely challenging. Three different space-vector modulation methods are proposed in the thesis. The developed methods are relatively simple to implement since they consider each inverter individually hence breaking down the problem into one of simpler complexity. The three modulation methods and the performance of the five- phase drive are verified using simulations. Finally, a laboratory prototype is described, which utilises two two-level five- phase inverters connected across an open-end-winding five-phase induction machine. The three modulation schemes are implemented using a fast prototyping control system (dSP ACE) and the performance of the modulation techniques is compared. The motor is controlled in V/fmode, in open loop. It is demonstrated that two of the methods produce multi-level output waveforms and that one method offers superior performance, with reduced converter losses.
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Sun, Pengwei. "Cascade Dual-Buck Inverters for Renewable Energy and Distributed Generation." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/26637.
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Renewable energy and distributed generation are getting more and more popular, including photovoltaic modules (PV), wind turbines, and fuel cells. The renewable energy sources need the power electronics interface to the utility grid because of different characteristics between the sources and the grid. No matter what renewable energy source is utilized, inverters are essential in the microgrid system. Thanks to flexible modular design, transformerless connection, extended voltage and power output, less maintenance and higher fault tolerance, the cascade inverters are good candidates for utility interface of various renewable energy sources.
This dissertation proposes a new type of cascade inverters based on dual-buck topology and phase-shift control scheme. Compared to traditional cascade inverters, they have enhanced system reliability thanks to no shoot-through problems and lower switching loss with the help of using power MOSFETs. With phase-shift control, it theoretically eliminates the inherent current zero-crossing distortion of the single-unit dual-buck type inverter. In addition, phase-shift control can greatly reduce the ripple current or cut down the size of passive components by increasing the equivalent switching frequency.
An asymmetrical half-cycle unipolar (AHCU) PWM technique is proposed for dual-buck full-bridge inverter. The proposed approach is to cut down the switching loss of power MOSFETs by half. At the same time, this AHCU PWM leads to current ripple reduction, and thus reducing ripple-related loss in filter components. Therefore, the proposed PWM strategy results in significant efficiency improvement. Additionally, the AHCU PWM also compensates for the zero-crossing distortion problem of dual-buck full-bridge inverter. Several PWM techniques are analyzed and compared, including bipolar PWM, unipolar PWM and phase-shifted PWM, when applied to the proposed cascade dual-buck full-bridge inverter. It has been found out that a PWM combination technique with the use of two out of the three PWMs leads to better performance in terms of less output current ripple and harmonics, no zero-crossing distortion, and higher efficiency.
A grid-tie control system is proposed for cascade dual-buck inverter with both active and reactive power flow capability in a wide range under two types of renewable energy and distributed generation sources. Fuel cell power conditioning system (PCS) is Type I system with active power command generated by balance of plant (BOP) of each unit; and photovoltaic or wind PCS is Type II system with active power harvested by each front-end unit through maximum power point tracking (MPPT). Reactive power command is generated by distributed generation (DG) control site for both systems. Selective harmonic proportional resonant (PR) controller and admittance compensation controller are first introduced to cascade inverter grid-tie control to achieve better steady-state and dynamic performances.Ph. D.
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Stalter, Olivier. "Inverter-integrated, sensorless and power-optimized position control of a concentrating photovoltaic dual-axis tracker." Grenoble INPG, 2009. http://www.theses.fr/2009INPG0186.
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L’intérêt du photovoltaïque à concentration (CPV) réside autant dans le faible volume de semi-conducteur que dans le fort rendement des cellules solaires III-V. Toutefois, du fait du dispositif optique, un positionnement mécanique très précis du générateur CPV via un traqueur solaire à deux axes de rotation est nécessaire. La première partie du travail de thèse consista à développer un onduleur hybride ou « Tracking Inverter » capable d’injecter le courant produit par un traqueur CPV tout en réalisant son positionnement. La seconde partie consista à implémenter les procédés de tracking classiques (capteur solaire, calcul astronomique ou hybride) afin d’évaluer leurs performances et leurs limites. Enfin, la réalisation majeure de la thèse fût le développement d’un nouveau procédé de tracking sans capteur et basé sur la puissance électrique de l’onduleur. La précision, la sensibilité et la fiabilité du Mechanical Maximum Power Point Tracker (MPPTm) en modes dégradés vinrent clore l’étude.
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Zhao, Zheng. "High Efficiency Single-stage Grid-tied PV Inverter for Renewable Energy System." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/27520.
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A single-phase grid connected transformerless photovoltaic (PV) inverter for residential application is presented. The inverter is derived from a boost cascaded with buck converter along with a line frequency unfolding circuit. Due to its novel operating modes, high efficiency can be achieved because there is only one switch operating at high frequency at a time, and the converter allows the use of power MOSFET and ultra-fast reverse recovery diode. This dissertation begins with theoretical analysis and modeling of this boost-buck converter based inverter. And the model indicates small boost inductance will leads to increase the resonant pole frequency and decrease the peak of Q, which help the system be controlled easier and more stable. Thus, interleaved multiple phases structure is proposed to have small equivalent inductance, meanwhile the ripple can be decreased, and the inductor size can be reduced as well. A two-phase interleaved inverter is then designed accordingly.
The double-carrier modulation method is proposed based on the inverterâ s operation mode. The duty cycle for buck switch is always one if the inverter is running in boost mode. And the duty cycle for boost switches are always zero if the inverter is running in buck mode. Because of this, the carrier for boost mode is stacked on the top of the carrier for buck mode, as a result, there is no need to compare the input and output voltage to decide which mode the inverter should operate in. And the inverter operates smoothly between these two modes. Based on similar concept, three advanced modulation methods are proposed. One of them can help further improve the efficiency, and one of them can help increase the bandwidth and gain, and the last one takes the advantage of both.
Based on similar concept, another three dual-mode double-carrier based SPWM inverters are proposed. With both step-up and step-down functions, this type of inverter can achieve high efficiency in a wide range because only one switch operates at the PWM frequency at a time.
Finally, the simulation and experiment results are shown to verify the concept and the tested CEC (California Energy Commission) efficiency is 97.4%. It performs up to 2% more efficiently better than the conventional solution.Ph. D.
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Tedesco, Gianluca. "Controllo di una Macchina Asincrona Alimentata Tramite un Inverter Funzionante in Sovramodulazione e un Compensatore Reattivo con Tensione del Bus DC Variabile." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17212/.
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Il lavoro di tesi riguarda un azionamento elettrico denominato Dual Inverter. Questo è costituito da una macchina elettrica a centro stella aperto controllata tramite l'utilizzo di due inverter collegati alle due estremità degli avvolgimenti statorici. L'inverter principale collega la macchina all'alimentazione, che in ambito automotive potrebbe essere un pacco batterie, mentre l'inverter secondario ha il bus DC collegato a un banco flottante di condensatori, nella configurazione di un filtro attivo. Il vantaggio principale di questo azionamento è quello di aumentare la tensione ai capi degli avvolgimenti di macchina a parità di tensione di alimentazione, con un conseguente ampliamento delle regioni a coppia e a potenza costante, in termini di velocità. L'obbiettivo dell'elaborato è l'implementazione di un innovativo sistema di controllo che permetta: il funzionamento dell'inverter principale in regime di modulazione ad onda quadra, sfruttando la possibilità di compensare le armoniche indesiderate che tale regime introduce grazie alla presenza del secondo inverter; la regolazione della tensione del condensatore flottante in base alle condizioni di funzionamento e alla tensione richiesta all'inverter secondario. Lo studio comprende la verifica delle basi teoriche presenti in letteratura relative al sistema in analisi, la definizione di un modello matematico completo, l'implementazione del nuovo sistema di controllo, una serie di simulazioni numeriche eseguite in ambiente Simulink e delle prove sperimentali realizzate sul sistema reale, mediante un sistema di prototipazione rapida denominato dSPACE, presente nel laboratorio LEMAD del Dipartimento di Ingegneria dell'Energia Elettrica e dell'Informazione dell'Università di Bologna.
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Bedeschi, Filippo. "Controllo di una macchina brushless multi-trifase con fasi statoriche aperte e compensatore della potenza reattiva." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19055/.
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Dopo una descrizione della struttura e la spiegazione del principio di funzionamento di una macchina brushless trifase, vengono esposte le equazioni relative al modello matematico ai valori istantanei della macchina, per confrontarle in seguito con il caso multifase, e viene introdotto il concetto di regolazione della velocità e regioni di funzionamento della macchina.
Vengono, poi, descritte altre possibili configurazioni dell’azionamento, oltre a quella presa in esame in questo lavoro di tesi, e ricavate le equazioni del modello matematico dell’azionamento.
Di seguito sono descritte la configurazione di un inverter trifase e le varie tensioni di uscita che è in grado di fornire, e sono esposti i limiti di corrente e di tensione della macchina e dei due inverter presenti in questo azionamento; viene descritta la condizione di ottimo funzionamento e, infine, sono rappresentate le curve dei limiti di corrente e tensione, le regioni di funzionamento al variare della velocità e analizzati i vantaggi di questo azionamento rispetto a quello con singolo inverter.
Successivamente viene descritto lo schema di controllo completo dell’azionamento e analizzati nel dettaglio i suoi componenti.
Vengono spiegati, inoltre, i blocchi di Simulink utilizzati per costruire questa nuova tecnica di controllo per questo azionamento; in particolare viene preso in considerazione il modello relativo allo schema di controllo della velocità, quello del sistema Dual Inverter, quello della macchina brushless e quello del carico meccanico.
Infine vengono analizzati i grafici relativi alle simulazioni fatte e presi in considerazione i vantaggi ottenuti rispetto ad un azionamento con singolo inverter.
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Desalvo, Matteo. "Azionamenti con macchine elettriche alimentate da inverter e filtro attivo." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
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Nella tesi sono stati studiati e analizzati due azionamenti elettrici basati su macchina asincrona per applicazioni di trazione elettrica. Gli obiettivi principali consistono nell'ampliare la regione di funzionamento a coppia costante e aumentare, quanto più possibile, la coppia elettromagnetica prodotta dalla macchina nelle regioni di deflussaggio, ad alta velocità. Il primo capitolo è dedicato allo studio della macchina asincrona alimentata da un inverter e all'analisi delle prestazioni limite. Nel secondo capitolo si è analizzata una configurazione dual inverter, dove due convertitori sono collegati alle estremità opposte dell'avvolgimento trifase di statore: il convertitore principale è alimentato da un pacco batterie, mentre il convertitore secondario è alimentato da un condensatore flottante e costituisce un filtro attivo in grado di compensare la potenza reattiva assorbita dalla macchina, garantendo un fattore di potenza unitario sull'inverter principale. Il terzo capitolo è dedicato allo sviluppo di una nuova configurazione dual inverter nella quale il secondo convertitore è alimentato da un condensatore flottante ed è posto in parallelo al primo.
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Michelini, Andrea. "Studio di un architettura hardware per il controllo di inverter per motori multifase." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
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Lo scopo del lavoro è stato progettare una scheda di controllo in grado di concedere una buona flessibilità per il controllo di azionamenti elettrici, capace di interfacciarsi con configurazioni multi-livello, multifase e dual-motor. La progettazione è stata sviluppata con supporto di CAD elettronici commerciali.
La scheda presenta tre parti fondamentali. Due unità di controllo identiche per permettere l’interfacciamento con più configurazioni, nelle quali sono realizzate tutte le funzioni di controllo, ed un’unità chiamata PL2 per la rielaborazione dati di tipologia unicamente automobilistica.
E’ stato inoltre realizzato l’interfacciamento e l’assemblaggio con altre due schede elettroniche dedite all’attuazione dei segnali di controllo e alla gestione e rielaborazione dei segnali di veicolo.
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Venieri, Francesco. "Controllo di una macchina asincrona a fasi statoriche aperte con singolo inverter e compensatore del fattore di potenza." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
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L'oggetto della tesi consiste nello studio e nella realizzazione di un innovativo azionamento di tipo dual inverter a singola alimentazione per il controllo di macchine asincrone a centro stella aperto.
Il sistema è costituito da due inverter rispettivamente collegati ai capi degli avvolgimenti statorici del motore elettrico e prevede la presenza di un'unica sorgente di alimentazione: il primo inverter è direttamente collegato al pacco batterie ed è perfettamente isolato dal bus DC del secondo, sul quale è posto un banco di condensatori. Il secondo inverter ha lo scopo di svolgere un'opportuna compensazione di potenza reattiva, tale da incrementare le prestazioni della macchina elettrica.
L'elaborato realizzato prevede la verifica delle basi teoriche presenti in letteratura, nonché la definizione di un modello matematico completo e di un nuovo schema di controllo ottimizzato. Lo studio è poi confermato da simulazioni in ambiente Simulink e prove sperimentali eseguite mediante il sistema di prototipazione rapida dSPACE.
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Dragan, Milićević. "Razvoj naprednog upravljanja pogonom sa šestofaznim asimetričnim asinhronim motorom." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2014. http://dx.doi.org/10.2298/NS20140117MILICEVIC.
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U tezi je prikazana analiza pogona sa šestofaznom asimetričnomasinhronom mašinom koja se napaja iz šestofaznog invertora.Predložen je novi način upravljanja šestofaznim invertorom kojimsu rešeni nedostaci do sada predloženih tehnika upravljanja a kojise pre svega ispoljavaju kroz dva aspekta: nekontrolisano generisanjedodatnih gubitaka i teška implementacija u komercijalno dostupnedigitalne kontrolere. Rezultati svih teorijskih analiza i navoda sudokazani računarskim simulacijama i eksperimentalnim putem.Eksperimentalna verifikacija je ostvarena korištenjemlaboratorijskog prototipa koji se temelji na dSPACE kontrolnomsistemu.Doctoral thesis shows the analysis of the dual three-phase induction machinedrive. A novel way of driving of the six-phase inverter is proposed. Aproposed method solves disadvantages of currently proposed drivingtechniques which are manifested in two aspects: the uncontrolled generationof additional losses and difficult implementation in commercially availabledigital controllers. The results of theoretical analysis and the statements areproven by computer simulation and experimentally. Experimental verificationis achieved using a laboratory prototype that is based on dSPACE controlsystem.
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Dehghanikiadehi, Abbas. "Commande vectorielle innovante pour véhicules électriques ou hybrides." Thesis, Université Clermont Auvergne (2017-2020), 2017. http://www.theses.fr/2017CLFAC012/document.
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Durant ces dernières années, l'intérêt pour les technologies des véhicules à faibles émissions de carbone a fait un bond important à travers l'Union européenne (UE) et au-delà, encouragé en cela par les gouvernements et les constructeurs automobiles. De grands espoirs ont été mis plus récemment dans les véhicules électriques (VE) et les véhicules électriques hybrides (VEH) en tant que technologies clés pour atténuer le changement climatique, améliorer la sécurité énergétique et favoriser une nouvelle branche de l'industrie dans le secteur automobile. Ainsi, l'électrification des transports a été considérée comme une stratégie clé pour réduire les émissions de CO2 dans le secteur des transports. Le principal défi est d’augmenter l’autonomie des véhicules (ce qui a toujours été au coeur de la concurrence des industries du transport), ainsi que la durée de vie des volumineuses et coûteuses batteries. Par conséquent, ceci indique que le rendement du convertisseur de puissance est un des points clés à développer pour les générations des véhicules électriques à venir. L’autre paramètre influant est la qualité de la tension et du courant (en particulier la suppression des harmoniques basses fréquences) qui permet de réduire la taille des filtres d'entrée et de sortie de ces convertisseurs. L'objectif de cette thèse est de parvenir à un meilleur rendement en proposant de nouvelles structures de convertisseur de puissance et des commandes vectorielles modifiées ; le choix de deux onduleurs alimentant un moteur ouvert aux deux extrémités. Après l'analyse étape par étape, modèle théorique, simulation et enfin une mise en oeuvre expérimentale, il a été constaté que les nouvelles méthodes proposées sont compétitives et peuvent s’appliquer aux cas des VEH et des VE afin d’apporter des caractéristiques supérieures en termes d’efficacité et de qualité de tension et de courantOver the last decade, the interest for low-carbon vehicle technologies has surged among both governments and automotive manufacturers across and beyond the European Union (EU). Great hopes have been put, first, on biofuel vehicles and more recently on electric vehicles (EVs) and hybrid electric vehicles (HEVs) as key technologies to mitigate climate change, enhance energy security and nurture new industry branches within the automotive sector. So electrification of vehicles has been seen as a key strategy to reduce CO2 emissions from the transport sector. The main challenge toward EVs and HEVs is to keep driving for longer distance (which has been always fields for competition among traction industries) as well as lifetime battery cells as storage system. As a result, these indicate importance of power converter efficiency as a key gate for next generations of these up-coming vehicles. The next parameter is the quality of output voltage/current (especially by suppressing low-order harmonics) to reduce the size of filtering. The aim of this thesis is to achieve better efficiency and output voltage/current Total Harmonic Distortion (THD) by proposing novel power converter and associated Pulse Width Modulation (PWM) methods while imposing modification on power converter topology. As a result, dual-inverter is proposed to supply open-end motor from both sides. To this aim, three PWM methods are suggested as: The first one, Modified Space Vector Modulation (MSVM) for dual-inverter supplied by single dc source, improves efficiency by 4-5% (while having lower switching losses), and reduces Common Mode Voltage (CMV) levels by 66%, as well. The voltage/current harmonics are analytically analyzed which shows mainly better performance. Effective switching frequency is also reduced by 66% due to the reduction of number of commutations. In the second one, Near State PWM (NSPWM) is adapted for dual-inverter supplied by single dc source in order to eliminate triplen harmonics (therefore Zero Sequence Voltage, ZSV) and improve efficiency (by 3-4%) compared to Space Vector Modulation (SVM). Additionally due to avoiding use of zero vectors, CMV is improved by 66%. While having 8 commutations instead of 12 in SVM, effective switching frequency is improved by 33%. And finally, the third proposed method deals with NSPWM for dual-inverter supplied by two isolated dc sources wherein efficiency and CMV levels show the same performance as previous one. However, in this method, voltage THD is highly reduced compared to SVM. Triplen harmonics of the output voltage are inherently suppressed by the structure. These 3 proposed methods are analytically studied and their performances are step by step simulated in Matlab/Simulink environment. Then the methods are implemented in dualinverter fed open-end motor in laboratory setup; and the results are compared with these of SVM. Finally, it is found that novel proposed methods are so competitive solutions to be applied in HEVs and EVs and bring superior efficiency and voltage/current harmonic features
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Marzouk, Mounir. "Développement de chargeurs intégrés pour véhicules hybrides plug-in." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT088/document.
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Ces travaux de thèse consistent en la conception et la réalisation d’une chaîne de tractionintégrée pour véhicule hybride plug-in. L’étude s’oriente vers une solution de convertisseur mutualisé,dans l’objectif de partager la traction et les modes chargeurs de batteries, la structure en NPC à 3niveaux est retenue. Le chargeur monophasé se base une topologie de redresseur à MLI monophaséavec trois bras entrelacés, avec l’utilisation des enroulements du moteur pour le filtrage. En chargeurtriphasé nous adaptons la topologie pour réaliser un montage en double boost triphasé. Pour chaqueconfiguration, les passifs sont dimensionnés pour répondre aux contraintes en courant BF et HF. Lecontrôle adopté se base sur les correcteurs résonants. Enfin, un prototype de 5 kW a été réalisé pourvalider les différents modes de l’application.Dans une seconde partie, nous proposons une solution de chargeur isolé sans étage continu auprimaire à double ponts actifs (DAB). La topologie est modélisée au premier harmonique et unecommande assurant l’absorption sinusoïdale est étudiée. Une configuration isolée triphasée permetl’accès aux puissances plus élevées ainsi que la réduction des ondulations de courant BF en sortieThis thesis consists on the design and realization of a plug-in hybrid vehicle integrated tractiondrive supply. The work turns to a solution of a mutualized converter, in the objective to imagine asolution which shared drive and battery chargers modes, the three-level NPC topology has beenretained. The single phase charger is based on an interleaved PWM rectifier, and motor windings areused as smoothing inductors. A double-boost PFC configuration is introduced to ensure the threephasecharger. Passives are sized in each configuration in order to take in account the whole currentconstraints (LF and HF). The PFC behavior is based on the resonant controllers. Then, a 5 kWprototype has been realized to validate the different application modes.In a second part, a single-stage isolated charger based on a Dual-Active-Bridge (DAB) isproposed. The topology is modeled to the fundamental and the PFC control law is studied. A threephaseconfiguration is simulated in order to achieve higher charging powers and to reduce batterycurrent low-frequency ripple
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Aboelhassan, Mustafa Osman Elrayah. "Robustní řízení synchronního stroje s permanentními magnety a spínaným tokem." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-233605.
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Je jasné, že nejúspěšnější konstrukce zahrnuje postup vícefázového řízení, ve kterém každá fáze může být považována za samostatný modul. Provoz kterékoliv z jednotek musí mít minimální vliv na ostatní, a to tak, že v případě selhání jedné jednotky ostatní mohou být v provozu neovlivněny. Modulární řešení vyžaduje minimální elektrické, magnetické a tepelné ovlivnění mezi fázemi řízení (měniče). Synchronní stroje s pulzním tokem a permanentními magnety se jeví jako atraktivní typ stroje, jejíž přednostmi jsou vysoký kroutící moment, jednoduchá a robustní konstrukce rotoru a skutečnost, že permanentní magnety i cívky jsou umístěny společně na statoru. FS-PMSM jsou poměrně nové typy střídavého stroje stator-permanentní magnet, které představují významné přednosti na rozdíl od konvenčních rotorů - velký kroutící moment, vysoký točivý moment, v podstatě sinusové zpětné EMF křivky, zároveň kompaktní a robustní konstrukce díky umístění magnetů a vinutí kotvy na statoru. Srovnání výsledků mezi FS-PMSM a klasickými motory na povrchu upevněnými PM (SPM) se stejnými parametry ukazuje, že FS-PMSM vykazuje větší vzduchové mezery hustoty toku, vyšší točivý moment na ztráty v mědi, ale také vyšší pulzaci díky reluktančnímu momentu. Pro stroje buzené permanentními magnety se jedná o tradiční rozpor mezi požadavkem na vysoký kroutící moment pod základní rychlostí (oblast konstantního momentu) a provozem nad základní rychlostí (oblast konstantního výkonu), zejména pro aplikace v hybridních vozidlech. Je předložena nová topologie synchronního stroje s permanentními magnety a spínaným tokem odolného proti poruchám, která je schopná provozu během vinutí naprázdno a zkratovaného vinutí i poruchách měniče. Schéma je založeno na dvojitě vinutém motoru napájeném ze dvou oddělených vektorově řízených napěťových zdrojů. Vinutí jsou uspořádána takovým způsobem, aby tvořila dvě nezávislé a oddělené sady. Simulace a experimentální výzkum zpřesní výkon během obou scénářů jak za normálního provozu, tak za poruch včetně zkratových závad a ukáží robustnost pohonu za těchto podmínek. Tato práce byla publikována v deseti konferenčních příspěvcích, dvou časopisech a knižní kapitole, kde byly představeny jak topologie pohonu a aplikovaná řídící schémata, tak analýzy jeho schopnosti odolávat poruchám.
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Hsiang-YiChu and 朱湘儀. "Dual Buck Inverter with Constant Frequency Variable Hysteresis Current Control." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/90045155481958795728.
Full textAbstract:
碩士國立成功大學
電機工程學系
102
The purpose of this thesis is to implement a dual buck inverter for tide power transfer system. Because the change of front-end tide power transfer system output AC voltage could be varying and low. By realized the first stage of boost converter to rectify and boost the voltage, then convert power to the second stage of dual buck inverter. The thesis presents a new control strategy of constant frequency with variable hysteresis width. It can design the filter and choose power components easily when using the new type control. Compare to conventional hysteresis current control, by constant frequency variable hysteresis current control, it reduces the total harmonic distortion and the ripple of output voltage. Furthermore, it raises the system of power conversion efficiency. Finally, the thesis proposed a prototype 500 watt dual buck inverter system is implemented. The maximum efficiency of the system is 97% and THD is less than 2%.
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Ming-KaiChuang and 莊銘凱. "A New Dual-Buck Five-level Inverter with Coupled Inductors." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/30675287382179477219.
Full textAbstract:
碩士國立成功大學
電機工程學系
102
The input capacitors used in conventional multilevel inverters commonly experience a voltage-imbalance problem. Accordingly, the thesis proposes a new dual-buck inverter with coupled inductors to realize a five-level inverter, consisting of single input capacitor, a dual-buck module, and a full-bridge module. With the coupled inductors, the inverter ensures an improved sinusoidal voltage to the load. In addition, the dual-buck module enhances system reliability by solving the shoot-through problem existing in conventional circuits. The proposed dual-buck module, comprising two diodes and two power switches, generates a three-level voltage which is then converted to a five-level sinusoidal voltage by the full-bridge module. A modulation method is developed accordingly for the proposed inverter with various switching patterns analyzed. Via the presented modulation method, no dc offset exists in the magnetizing inductor currents, and problems of core saturation can thus be avoided. The performance of the proposed converter is evaluated by the implemented prototype circuit with an input dc voltage of 380 V, an output ac voltage of 220 Vrms, and an input power of 1.5 kW. The experimental results show that the output voltage total harmonic distortion (THD) of 1.2 % at full load condition and a highest efficiency of 94.7% have been achieved to validate the feasibility and effectiveness of the proposed multilevel inverter.
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Kelecy, Patrick M. "Control methodologies for single inverter, dual induction motor drives for electric vehicles." 1994. http://catalog.hathitrust.org/api/volumes/oclc/32365345.html.
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Thesis (Ph. D.)--University of Wisconsin--Madison, 1994.Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 165-167).
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Liu, Fang-Shiang, and 劉芳祥. "Full-Bridge Inverter With Dual-Linear Approximation MPPT To Process Photovoltaic Power." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/31854995880634585038.
Full textAbstract:
碩士國立高雄第一科技大學
電子與資訊工程研究所
98
In this paper, a double-linear approximation algorithm (DLAA) to achieve maximum-power-point tracking (MPPT) for PV arrays is proposed. The DLAA is based on that the trajectories of maximum power point varying with irradiation and temperature are approximately linear. With the DLAA, a maximum power point can be determined instantaneously. Moreover, complicated calculation and perturbation about an optimal point can be avoided. In the paper a corresponding circuit to complete DLAA is proposed as well, of which configuration is simple. As a result, the proposed circuit is cost-effective and can be embedded into PV arrays easily. An implementation example of PV power system with the proposed MPPT is carried out and the DLAA is compared with the perturb-and-observe method. From simulated and experimental results, the proposed MPPT algorithm has been verified and the feasibility of the proposed circuit is also demonstrated.
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Chen, Lin. "Investigation of Dual-Stage High Efficiency and Density Micro Inverter for Solar Application." Doctoral diss., 2014. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6074.
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Module integrated converters (MIC), also called micro inverter, in single phase have witnessed recent market success due to unique features (1) improved energy harvest, (2) improved system efficiency, (3) lower installation costs, (4) plug-N-play operation, (5) and enhanced flexibility and modularity. The MIC sector has grown from a niche market to mainstream, especially in the United States. Due to the fact that two-stage architecture is commonly used for single phase MIC application. A DC-DC stage with maximum power point tracking to boost the output voltage of the Photovoltaic (PV) panel is employed in the first stage, DC-AC stage is used for use to connect the grid or the residential application. As well known, the cost of MIC is key issue compared to convention PV system, such as the architecture: string inverter or central inverter. A high efficiency and density DC-DC converter is proposed and dedicated for MIC application.
Assuming further expansion of the MIC market, this dissertation presents the micro-inverter concept incorporated in large size PV installations such as MW-class solar farms where a three phase AC connection is employed. A high efficiency three phase MIC with two-stage ZVS operation for grid tied photovoltaic system is proposed which will reduce cost per watt, improve reliability, and increase scalability of MW-class solar farms through the development of new solar farm system architectures. This dissertation presents modeling and triple-loop control for a high efficiency three-phase four-wire inverter for use in grid-connected two-stage micro inverter applications. An average signal model based on a synchronous rotation frame for a three-phase four-wire inverter has been developed. The inner current loop consists of a variable frequency bidirectional current mode (VFBCM) controller which regulates output filter inductor current thereby achieving ZVS, improved system response, and reduced grid current THD. Active damping of the LCL output filter using filter inductor current feedback is discussed along with small signal modeling of the proposed control method.
Since the DC-link capacitor plays a critical role in two-stage micro inverter applications, a DC-link controller is implemented outside of the two current control loops to keep the bus voltage constant. In the end, simulation and experimental results from a 400 watt prototype are presented to verify the validity of the theoretical analysis.Ph.D.
Doctorate
Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering
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Wu, Ying-Pin, and 吳英賓. "Application of Nonisolated Single-input Dual-output Converter to Grid-connected Half-bridge Inverter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/s5a7vw.
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碩士國立交通大學
電控工程研究所
105
Nonisolated single-input dual-output converter (NSIDOC) possesses common-ground characteristics. When this converter is connected to the grid-connected half-bridge inverter. The ground of DC input source is the same as the ground of the grid voltage.Therefore, The current through the ground capacitance would be reduced. Which is important to the PV application. In this thesis, NSIDOC has been studied and implemented. Some simulations and experimental results are provided to demonstrate the idea.
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Liu, Chang-Yuan, and 劉昌遠. "Implementation of a Current Amplifier using Paralleled Dual-Module Current-Controlled DC/AC Inverter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/nzyxh7.
Full textAbstract:
碩士國立臺北科技大學
電力電子產業研發碩士專班
96
This thesis is concerned with the analysis and implementation of a paralleled dual-module current amplifier. A current amplifier with a dual modules connected in parallel is presented based on the interleave control, so as to increase the carrier frequency at output and hence to improve the dynamic response and decrease output current ripple, therefore the size of output filter will be reduced. Also, a current controller is added in each module to make the current flowing through modules evenly distributed in steady state. To facilitate the studies performed in this thesis, a DSP-based controller is constructed using a DSP TMS320F2812 manufactured by Texas Instruments. There are several benefits using DSP-based to implement the dual-module parallel current amplifier, such as to simplify hardware circuits, to generate flexible functions and to adapt changing environmental conditions, etc. For saving the execution time, all the routines are coded by assembly language. Finally, some experimental results have confirmed the validity of the proposed methods in paralleled dual-module current amplifier.
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Ortlepp, Kerren Mark. "Feasibility study of the dual active bridge as a low-frequency sine wave inverter." Thesis, 2018. https://hdl.handle.net/10539/25687.
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Master of Science in Engineering by research only
A dissertation submitted to the Faculty of Engineering and the Built Environment,
University of Witwatersrand, Johannesburg, in fulfilment of the requirements
for the degree of Master of Science in Engineering.
Johannesburg 2018The conventional Sinusoidal PulseWidth Modulation (SPWM) inverter is limited by the fact that it does not allow for Zero Voltage Switching. This means that the switching frequency is kept low to reduce the switching losses. As a consequence of holding these switching frequencies low, the distribution of power over the frequency spectrum is kept closer to the fundamental frequency (compared to higher switching frequencies) leading to larger reactive components to filter out these harmonics. The use of high-frequency switching, Zero Voltage Switching, and different modulation schemes can lead to higher power densities. This research investigates under what conditions the use of these techniques in a Dual Active Bridge (DAB) inverter might lead to a higher power density than the SPWM. Volumetric approximations for the different circuit components in the investigated inverter topologies are demonstrated. These approximations are used to design circuits using physical volume as the cost function where possible. Additionally, a loss model is derived to determine the expected efficiency of each topology being investigated. This model is related to the power density since it is directly proportional to the size of heat sink required to cool the inverter. The techniques for improving power density mentioned above are presented, and the impact that they have on power density is shown using the volumetric approximation function. From this approximation, the volumes between the DAB and the SPWM are compared and investigations into where the DAB may have a higher power density have been performed. It was found that the DAB was not smaller than the SPWM for frequencies less than 72kHz. When simulating the converters operating at different frequencies, the general trend is that the SPWM increases in volume as the frequency increases, whereas, the DAB decreases in volume as the frequency increases. An exact frequency at which the DAB would be smaller than the SPWM was not found in this research. However, many conclusions have been drawn around the use of a DAB as an inverter and the strengths and shortcomings it provides. The modulation scheme would need to be modified to reduce the losses and provide a more competitive volume. Additionally, multi-level and multi-stage techniques could be used to reduce the volume further.
MT 2018
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Winterhalter, Craig R. "Field oriented control of a single inverter, dual, parallel induction machine traction drive for electric vehicles." 1997. http://catalog.hathitrust.org/api/volumes/oclc/39542837.html.
Full textAbstract:
Thesis (M.S.)--University of Wisconsin--Madison, 1997.Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 145-152).
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Lu, Hong-yi, and 盧弘翊. "Thermal management and performance evaluation based on a dual bi-directional, soft-switched IGBT for the autonomous microgrid inverter power system under various operating conditions." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/55127996748021533437.
Full textAbstract:
碩士國立中央大學
能源工程研究所
102
The thermal management of the inverter is of great importance since very high voltage/current will be switched intermittently and/or continuously and high temperature is excruciably detrimental to the service life of electronics such as insulated gate bipolar transistor (IGBT). In this study, a newly developed dual bi-directional IGBT-based inverter with autonomous microgrid system is investigated with particular focus on the thermal management under various operation conditions. The module is operated at the switching and pulse frequencies of 60 Hz and 20 kHz, respectively. The adoption of thermal interface material in either paste or film form had experimentally shown to possess the flexibility tailoring heat transfer performance locally. Experimental studies of heat dissipating film with various hotspot scenarios showed that the temperature difference can be appreciably reduced as many as 15.4°C and 13.1°C, respectively with facilitation of one- and two- layers of heat dissipating film. From the measurement results, the measured peak temperature is highly dominated by the thickness of heat dissipating film, showing the dominance of thickness-dependent thermal resistance and resultant heat accumulation.