Relevant bibliographies by topics / Current commutation

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Current commutation'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "Current commutation"

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Barber, J. P., T. D. Smith, and S. Foley. "Resistive commutation at megampere current levels." IEEE Transactions on Magnetics 25, no. 1 (1989): 75–78. http://dx.doi.org/10.1109/20.22508.

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Wang, Qi, Chaoming Zhang, Xingquan Wu, and Yi Tang. "Commutation Failure Prediction Method Considering Commutation Voltage Distortion and DC Current Variation." IEEE Access 7 (2019): 96531–39. http://dx.doi.org/10.1109/access.2019.2929301.

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Wang, Xiao Feng, and Wei Lin. "BLDCM Commutation Torque Ripple Strategy Optimization." Applied Mechanics and Materials 556-562 (May 2014): 2039–42. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.2039.

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First of all, this article creates the mathematical model of blushless DC Motor. Secondly, analysis the reduction theory of commutation torque ripple. Finally, put forward a strategy to reduce the commutation torque ripple from the low-speed level and high-speed level. This method guarantee equal between current decline rate of shutdown phase and current rising rate of opening phase during commutation, thus keep the current of un-commutation stable. Build a real brushless DC motor control platform for experimental verification, the proposed strategy of brushless DC motor commutation torque ripple is suppressed effectively.
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Liu, Tao, Tong Zhao, Liang Zou, Li Zhang, and Meng Qi Liu. "Diagnosis of Commutation Failures in HVDC System Based on Voltage or Current of the Converter Valve." Advanced Materials Research 960-961 (June 2014): 738–41. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.738.

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Commutation failure is one of the most common typical faults of HVDC, and it may result in subsequent commutation failures, even the outage of the HVDC system if without timely and effective regulatory measures. Trigger of the control measures depends on the rapid and accurate diagnosis of commutation failure. In-depth analysis of the commutation failure mechanism indicates its new substantive characteristics: valve voltage being continuously zero and valve current being continuous with high amplitudes, according to which a novel method for fault diagnosis of commutation failure based on voltage or current of the converter valve is proposed in this paper. Simulation results prove the accuracy and effectiveness of this method.
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Raja, M. Senthil, and B. Geethalakshmi. "Analysis and Implementation of a High Boost Ratio DC-DC Converter for Minimizing Commutation Torque Ripple in Brushless DC Motor." International Journal of Power Electronics and Drive Systems (IJPEDS) 7, no. 2 (2016): 583. http://dx.doi.org/10.11591/ijpeds.v7.i2.pp583-600.

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Brushless dc motor still suffers from commutation torque ripple, which primarily depends on transient line current in the commutation interval. In order to control the incoming and outgoing phase currents to change at the same rate during commutation, this paper presents a novel high boost ratio DC-DC circuit topology in the front end of the inverter. With a suitable closed loop control scheme, the proposed high boost ratio DC-DC converter is operated with two different duty ratios one during commutation period and the other during non commutation period. The cause of commutation ripple is analyzed, and the way to adjust the duty ratio for obtaining the desired dc link voltage is introduced in detail. Finally, simulation and experimental results show that, compared with the existing dc–dc converter topologies, the proposed method can obtain the desired voltage much faster and minimize commutation torque ripple more efficiently
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Avilov, V. D., and D. I. Popov. "Commutation in the direct current machines with rolling current collecting." Russian Electrical Engineering 79, no. 7 (2008): 366–69. http://dx.doi.org/10.3103/s1068371208070055.

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Jin, Chang-Sung, Chang-Min Kim, In-Jin Kim, and Iksang Jang. "Proposed Commutation Method for Performance Improvement of Brushless DC Motor." Energies 14, no. 19 (2021): 6023. http://dx.doi.org/10.3390/en14196023.

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This study focused on the efficiency improvement and acoustic noise reduction of brushless DC (BLDC) motors by reducing current harmonics using a novel BLDC commutation method. To achieve these goals, we designed an improved 150° commutation method for a three-phase permanent magnet BLDC motor that can improve the current waveform. Although the 120° commutation method is generally employed for BLDC motors, an improved 150° commutation method is introduced to operate the BLDC with increased efficiency and acoustic noise similar to a brushless AC motor. This study investigated the attributes of various commutation methods, both theoretically and experimentally, to determine the optimal commutation method. The results of this study indicate that the improved 150° commutation method is optimal in terms of harmonic attributes and reduced torque ripple, allowing it to improve motor efficiency and reduce acoustic noise.
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Li, Xinnian, Fengqi Li, Shuyong Chen, et al. "An Improved Commutation Prediction Algorithm to Mitigate Commutation Failure in High Voltage Direct Current." Energies 10, no. 10 (2017): 1481. http://dx.doi.org/10.3390/en10101481.

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Wang, Xiao Ming, Qi Zhang, and Bin Qian. "Reactive Power Compensation Method of HVDC Commutation Failure." Applied Mechanics and Materials 536-537 (April 2014): 1510–13. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.1510.

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In the high-voltage direct current transmission system, the difference value between the landing phase voltage and DC transmission system commutation failure of the critical voltage drop value, as system occurred in the critical value of commutation failure. When commutation voltage lower than the critical value would reduce arc Angle, caused by commutation failure。Therefore, by using the method of reactive power compensation to keep converter bus voltage stability, can avoid commutation failure.
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Ma, Xing He, Jun Ying Zhao, Li Jia, and Peng Fei Ji. "Study on Varying-Step Commutation Strategy of Matrix Converter." Applied Mechanics and Materials 143-144 (December 2011): 132–38. http://dx.doi.org/10.4028/www.scientific.net/amm.143-144.132.

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Aiming at safe commutation and improving quality of output waveform, the paper presents a new varying-step safe commutation strategy of matrix converter by analyzing the character of traditional four-step commutation and improved four-step commutation strategy. On the basis of input-voltage-based commutation this new strategy synthetically considers the magnitude of input voltage and output current direction and accordingly distinguishes the safe partition and the unsafe partition. Then different commutation strategies are adopted in different partition which improving the reliability of commutation and decreasing the commutation time to improve the quality of output waveform. Finally, the( ) experiment results demonstrate the availability and reliability of the presented commutation strategy. Thereby, the open-circuit or short-circuit faulty caused by abnormal commutation can be eliminated. The output waveform can be improved because the commutation time can be decreased by 2/3 compared to the traditional four-step commutation strategy.
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Dissertations / Theses on the topic "Current commutation"

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Empringham, Lee. "Matrix converter current commutation." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342443.

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Magnusson, Jesper. "Studies on Current Commutation in Hybrid DC-breakers." Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207465.

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Compared to conventional AC-circuit breakers, a DC-breaker has to act fast and force the current down to zero. Many different DC-breaker topologies are available, and this thesis is focused on the hybrid DC-breaker comprising a mechanical switch and high power semiconductors. The main part of this thesis is focused on the current commutations in the hybrid DC-breaker. The two current commutations: from the mechanical switch to the semiconductor branch, and from the semiconductor to the metal oxide varistor, have completely different characteristics. When the mechanical switch opens, the metallic contacts separate and an electric arc is formed. As the voltage across the arc is higher than the voltage across the semiconductors, the current is pushed over to the semiconductor branch. The undesired stray inductance in the loop limits the current derivative and slows down the commutation. As the contacts keep separating, the arc voltage increases and eventually all current is conducted by the semiconductor and the arc ceases. For a hybrid DC-breaker, the worst case is a solid ground fault, as the fast rising current results in high current levels and makes the commutation from the mechanical switch to the semiconductor both difficult and slow. However, the fast rise of the current can be used to enhance the commutation by using coupled inductors in the two parallel branches. When the fault current rises in the semiconductor branch, the mutual coupling of the inductors causes the current in the mechanical switch to decrease and helps the commutation. The result is that the commutation time decreases with decreasing fault impedance, and makes the solid ground fault easier to handle. The commutation from the semiconductor to the metal oxide varistor is controlled by the turn-off of the semiconductor. When the semiconductor is turned off, it pulls the current down to zero with a rather constant current derivative regardless of the surrounding circuit and the system current is taken over by the metal oxide varistor. Hence, any inductance in the commutation loop will result in an over-voltage proportional to this inductance on top of the varistor voltage. By connecting a smaller metal oxide varistor, as a snubber, close to the semiconductor, the over-voltage can be controlled and the commutation from the snubber to the metal oxide varistor will be driven by the voltage difference between the two varistors. It is shown that for a 12 kV DC-system, a possible design of the mechanical switch in the hybrid DC-breaker comprises two contact gaps in series and opens with a velocity of 11 m/s. It has been experimentally verified that when starting the commutation at 4 kA, the commutation takes less than 700 us and is over before the switch has opened 1 mm. The thesis also contains proposed designs for an 80 kV DC-breaker that can be used as a modular solution for higher system voltages. For this higher voltage, the design will be a choice of the combination between the number of contact gaps in series and the opening velocity of the mechanical switch.<br>Till skillnad från konventionella brytare i växelspänningssystem behöver en brytare för likström (DC) reagera fortare och tvinga ner strömmen. Det finns många olika topologier för hur man kan designa en DC-brytare, men denna avhandling fokuserar på en hybridbrytare som består av en mekanisk kontakt och halvledarkomponenter. Huvuddelen av denna avhandling fokuserar på kommuteringen av strömmar mellan hybridbrytarens grenar. Brytförloppet består av två kommuteringar: från den mekaniska kontakten till halvledarna och från halvledarna till en metalloxidvaristor och dessa två kommuteringar har helt olika karakteristik. När den mekaniska kontakten öppnar bildas en ljusbåde. Eftersom ljusbågsspänningen är högre än spänningsfallet över halvledarna, flyttas strömmen över till halvledargrenen. Den oönskade induktansen som finns i kretsen kommer begränsa kommuteringen och förlänga tiden det tar att flytta strömmen från den mekaniska kontakten till halvledarna. Tack vare att den mekaniska kontakten öppnar med hög hastighet förlängs ljusbågen och ljusbågsspänningen fortsätter att öka tills all ström flyttats över till halvledarna och ljusbågen slocknar. För hybridbrytaren är ett solitt jordfel det värsta felfallet eftersom den snabbt ökande felströmmen leder till en svårare och mer utdragen kommutering till halvledarna. Den höga strömderivatan kan dock utnyttjas genom att installera två kopplade spolar i serie med den mekaniska kontakten och halvledarna. När strömmen ökar i halvledargrenen skapar den kopplade induktansen en motspänning som leder till en minskad ström genom den mekaniska kontakten och snabbar på kommuteringen. Resultatet är att kommuteringstiden blir kortare ju snabbare felströmmen växer. Kommuteringen från halvledarna till varistorn styrs av halvledarkomponenternas karakteristik. När halvledaren stänger av tvingas strömmen ner med en näst intill konstant derivata oberoende av komponenterna i kretsen och strömmen tas över av varistorn. Den oönskade induktansen i kretsen kommer då ge upphov till en överspänning proportionell till induktansen som ökar kraven på halvledaren. Genom att installera en liten varistor nära halvledaren kan överspänningen kontrolleras och kommuteringen kommer istället drivas av spänningsskillnaden mellan de två varistorerna. För ett 12 kV likströmssystem är en möjlig design av den mekaniska kontakten att ha två kontaktgap i serie och en öppningshastighet på 11 m/s. Experiment har verifierat att om kommuteringen startar vid 4 kA tar den midre än 700 us och är avslutad innan kontakten öppnats 1 mm. Avhandlingen innehåller även förslag på hur en 80 kV brytare kan designas för att användas som en modul i system med högre spänning. I det fallet är designen en avvägning mellan antalet kontakter i serie och öppningshastigheten på kontakten.<br><p>QC 20170519</p>
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Bland, Michael. "An investigation of matrix converter losses and soft switching techniques." Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289478.

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Current research and the price of semiconductors are making Matrix Converter topologies more attractive and practically viable for many applications. One of the key benefits claimed for the matrix approach is the possibility of greater power density due to the absence of a DC link. To capitalise on this it is necessary to make the input filter small by having a sufficiently high switching frequency. In order to arrive at optimised solutions in terms of filtering, heatsinking and packaging, it is important to have accurate models to predict power circuit losses as a function of operating point and switching frequency. This aim of this thesis is to further the understanding of Matrix Converter current commutation with a focus on switching losses. The commutation process is analysed in detail and a complete loss model for Matrix Converter circuits is developed. The use of circuit simulation software in the prediction of switching losses is investigated and comparisons are made with experimentally measured results. The loss model is used to compare Matrix Converter losses with a functionally equivalent sinusoidal front end inverter. A review of soft switching techniques for Matrix Converter circuits is given. A new auxiliary resonant soft switching Matrix Converter is presented which overcomes many of the problems of the previously proposed circuits. The design, construction and testing of a 6kW prototype soft switching Matrix Converter is presented to evaluate the feasibility of the topology.
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Khopkar, Rahul Vijaykumar. "DC-DC converter current source fed naturally commutated brushless DC motor drive." Texas A&M University, 2003. http://hdl.handle.net/1969.1/1257.

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The aim of this work is to reduce the cost and size of a brushless dc motor (BLDC) drive as well as increase the reliability and ruggedness of that drive. Traditional BLDC drives use Voltage Source Inverters (VSI) that utilize hard switching, thereby generating switching losses and entail the use of large heatsinks. VSI needs a huge dc link capacitor that is inherently unreliable and is one of the most expensive components of a drive. Hence, a Current Source Inverter (CSI) is used to replace the hard switchings by natural turn-off, thereby eliminating the heatsinks as well as the large dc link capacitor. A controlled rectifier together with a large inductor act as the current source. The only disadvantage is the large value of the dc link inductor and the huge number of turns needed to achieve these values of the inductances lead to huge resistive losses. Therefore, it is shown that it is possible to replace the controlled rectifier and the large inductor with a suitable dc-dc converter based current source switching at high frequencies and a much smaller value of the dc link inductor. Switching at high frequencies makes it possible to reduce the value of the dc link inductor without increasing the current ripple. Hence, it is possible to have the advantages of using a CSI as well as reduce the value of the dc link inductor without a corresponding increase in the heat sink and snubber requirements.
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Karim, A. H. M. "Gate-Turn-Off thyristor commutation of DC machines : the development of a rotating DC machine with static commutation of armature coil current using Gate-Turn-Off thyristor devices." Thesis, University of Bradford, 1986. http://hdl.handle.net/10454/3371.

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The thesis Is concerned with the development of a separately excited DC machine In which gate turn-off thyristor devices with their associated firing and protective circuits are used to provide the static commutation of armature coil current. The developed machine has Its armature winding with 24 tapping points located on the stator and Interconnected In "Lop" configuration. The Initiation of the conduction periods of armature switching devices Is defined by a digital control logic circuit. In conjunction with an Incremental rotary encoder which provides the necessary feedback Information relating to shaft speed and shaft angular position. This Is arranged such that, under normal running conditions of the machine, the axis of the radial field of the armature winding maintains the normal space-quadrature relationship with that of the main field winding, giving the optimal torque angle of 000. Provision Is made, however, within the digital control circuit for controlled departure of the armature switch tapping points from the quadrature axis positions, and the effect of this, In Improving commutation Is Investigated. The effect of Interpoles Is also explored. On the basis of the analysis carried out, a proposal Is made for the future development of the machine employing a reduced number of armature switching devices without the need for Interpole windings.
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Zhang, Boyu. "Propagation des parois de domaines combinant courant polarisé et commutation toute optique." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS096/document.

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Depuis la première observation de désaimantation ultra-rapide dans des films de Ni soumis à une excitation laser pulsée, on a assisté à un grand intérêt de comprendre l'interaction entre les impulsions laser ultra-courtes et l'aimantation. Ces études ont conduit à la découverte de la commutation toute optique de l'aimantation dans un alliage de film ferrimagnétique en utilisant des impulsions laser femtosecondes. La commutation toute optique permet un renversement de l’aimantation d’un matériau magnétique sans champ magnétique externe. La direction de l'aimantation résultante est donnée par la polarisation circulaire droite ou gauche de la lumière. La manipulation de l'aimantation par un faisceau laser a longtemps été limité à un seul type de matériau, mais ce mécanisme s'est avéré être un phénomène plus général qui s’applique à une grande variété de matériaux ferromagnétiques, y compris des alliages, des empilements et des hétérostructures, ainsi que des hétérostructures ferrimagnétiques synthétiques de terres-rares. Récemment, nous avons observé le même phénomène dans des films ferromagnétiques simples, ouvrant ainsi la voie à une intégration de l'écriture toute optique dans les dispositifs spintroniques. De plus, dans des matériaux de type [Co/Pt] ou [Co/Ni] avec une polarisation de spin élevée et une anisotropie magnétique perpendiculaire contrôlable, un mouvement de parois de domaines induit par un courant polarisé peut être observé dans des pistes magnétiques (couple spin-orbite ou couple de transfert de spin), ce qui présente un grand intérêt pour des applications spintroniques basse consommation et de densité élevée, telles que le concept de mémoire racetrack et la logique magnétique. Cependant, la densité de courant requise pour le mouvement des parois de domaines est encore trop élevée pour permettre la réalisation de dispositifs à faible puissance. Dans ce contexte innovant, la recherche effectuée dans le cadre de ma thèse s’est concentrée sur la manipulation de parois de domaines dans les pistes fabriquées à partir de films minces à forte anisotropie magnétique perpendiculaire en combinant à la fois les effets du courant polarisé et ceux de la commutation toute optique. Différents films minces ont été explorés afin d'étudier les effets combinés optiques dépendant de l'hélicité et des couples spin-orbite ou de transfert de spin sur le mouvement des parois de domaines. Nous avons montré que les parois de domaine peuvent rester piégées sous une hélicité circulaire du laser et dépiégées par une hélicité circulaire opposée, et la densité de courant polarisé seuil peut être considérablement réduite en utilisant un laser femtoseconde. Nos résultats sont prometteurs pour le développement de nouveaux dispositifs photoniques-spintroniques de faible puissance<br>Since the first observation of ultrafast demagnetization in Ni films arising from a pulsed laser excitation, there has been a strong interest in understanding the interaction between ultrashort laser pulses and magnetization. These studies have led to the discovery of all-optical switching (AOS) of magnetization in a ferrimagnetic film alloy of GdFeCo using femtosecond laser pulses. All-optical switching enables an energy-efficient magnetization reversal of the magnetic material with no external magnetic field, where the direction of the resulting magnetization is given by the right or left circular polarization of the light. The manipulation of magnetization through laser beam has long been restricted to one material, though it turned out to be a more general phenomenon for a variety of ferromagnetic materials, including alloys, multilayers and heterostructures, as well as rare earth free synthetic ferrimagnetic heterostructures. Recently, we have observed the same phenomenon in single ferromagnetic films, thus paving the way for an integration of all-optical writing in spintronic devices. Moreover, in similar materials, like [Co/Pt] or [Co/Ni] with high spin polarization and tunable perpendicular magnetic anisotropy (PMA), efficient current-induced domain wall (DW) motion can be observed in magnetic wires, where spin-orbit torque (SOT) or spin transfer torque (STT) provides a powerful means of manipulating domain walls, which is of great interest for several spintronic applications, such as high-density racetrack memory and magnetic domain wall logic. However, the current density required for domain wall motion is still too high to realize low power devices. This is within this very innovative context that my Ph.D. research has focused on domain wall manipulation in magnetic wires made out of thin film with strong perpendicular magnetic anisotropy combining both spin-polarized current and all-optical switching. Different material structures have been explored, in order to investigate the combined effects of helicity-dependent optical effect and spin-orbit torque or spin transfer torque on domain wall motion in magnetic wires based on these structures. We show that domain wall can remain pinned under one laser circular helicity while depinned by the opposite circular helicity, and the threshold current density can be greatly reduced by using femtosecond laser pulses. Our findings provide novel insights towards the development of low power spintronic-photonic devices
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Lefebvre, Stéphane. "Contribution à la caractérisation de l'IGBT en commutation à zéro de courant." Cachan, Ecole normale supérieure, 1994. http://www.theses.fr/1994DENS0009.

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Cette étude analyse la commutation de blocage d'un igbt utilise en commutation quasi-résonnante a zéro de courant. Deux igbt de structure technologique différente ont été étudiés, le premier est à base non homogène et a couche tampon, le second à base homogène et contrôlé d'injection de charges par l'émetteur. L'évolution de la charge stockée dans la base du transistor bipolaire interne au blocage est suivie et analysée à l'aide de simulations et d'expérimentations. Différents éléments interviennent sur l'évacuation de la charge stockée donc sur les pertes au blocage, qu'ils soient propres au composant (coefficients d'injection ou durées de vie) ou a sa commande (maintien du canal lors de la conduction de la diode antiparallèle). Ce qui permet de comprendre pourquoi les pertes au blocage sont plus faibles en commutation a zero de courant qu'en commutation commandée. Une caractérisation électrique et thermique de l'igbt permet ensuite de quantifier l'influence des conditions de commutation sur les pertes au blocage. Des limites de fonctionnement sont ainsi définies, pour s'affranchir de l'emballement thermique, principale cause de destruction des igbt a couche tampon en zcs a fréquence de découpage élevée
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Gabsi, Mohamed Khémis. "Contribution a l'etude de la commutation dans les machines a courant continu associees a des convertisseurs statiques de puissance." Paris 6, 1987. http://www.theses.fr/1987PA066170.

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Labrousse, Denis. "Amélioration des techniques d’estimation des perturbations conduites : application à une chaîne de traction de véhicule électrique." Thesis, Cachan, Ecole normale supérieure, 2010. http://www.theses.fr/2010DENS0042/document.

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Dans les domaines industriels et en particulier celui du transport, le nombre et la puissance des équipements électriques et électroniques embarqués est en constante augmentation. L’alimentation des équipements électriques et la commande de ces actionneurs nécessitent l’utilisation de convertisseurs d’électronique de puissance à découpage dont la nature perturbatrice n’est plus à démontrer. Afin de prendre en compte la CEM dès la phase de conception d’un produit, les constructeurs doivent disposer d’outils dédiés à la CEM ou à défaut de règles ou techniques de conception spécifiques. C’est dans l’optique de répondre à ces besoins que se sont orientés ces travaux de thèse.La première partie des travaux traite de la modélisation des perturbations conduites des organes de puissance d’une chaîne de traction : un ensemble convertisseur / machine synchrone à rotor bobiné. Cette étude a conduit à un modèle CEM générique d’une structure non isolée quelconque d’électronique de puissance. La deuxième partie a permis de développer une nouvelle méthode de calcul qui ouvre de réelles perspectives quant à la réduction des temps de calcul. Par l’observation et l’étude de signaux sur différents horizons temporels, une technique de reconstitution des perturbations de mode commun par convolution a été proposée. Une troisième partie, consiste à synthétiser les sources de perturbations grâce à l’élaboration de fonctions de transfert décrivant le comportement haute fréquence d’une cellule de commutation. Cette approche immédiatement exploitable en simulation numérique se distingue dans la mesure où elle permet de s’affranchir des non linéarités intrinsèques des composants semi-conducteurs<br>In the transport field, whether road, rail, marine or aeronautic, the number and power of embedded electric or electronic devices are constantly increasing. New features, often developed for passengers comfort, are responsible for this increase. Moreover, many actuators which were previously mechanical, thermal or hydraulic are replaced by electrical ones. Those new actuators need an electrical power supply which most of the time rely on power electronics. It is well known that this kind of device generate high levels of disturbances. In order to take into account the electromagnetic compatibility (EMC) at the design stage of a product, builders need tools adapted to EMC or specific conception rules. The work performed during this thesis is geared in order to meet these needs.The first part deals with the modeling of conducted electromagnetic interferences (EMI) of an electrical power train mainly composed by power electronics converter and a wound rotor synchronous machine. Thanks to this study, a generic model of any non-insulated structure of power electronics was developed. The second part consists in developing a new computing method which allows to reduce the time of computing. Based on the observation of signals on different time intervals, a reconstruction technique by convolution product is proposed and applied for a common mode current. The third part deals with the elaboration of sources of disturbances by transfer functions which describe the high frequency behavior of a switching cell. This modeling is directly implementable in a circuit simulation software as it allows to linearize the intrinsic non linear behavior of the semiconductor components
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Yang, Gang. "Design of a High Efficiency High Power Density DC/DC Converter for Low Voltage Power Supply in Electric and Hybrid Vehicles." Thesis, Supélec, 2014. http://www.theses.fr/2014SUPL0011/document.

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Cette thèse traite de la conception d’un convertisseur DC / DC destiné aux véhicules électriques et hybrides (2,5 kW, 400V/14V, 250kHz). Dérivé de la topologie LLC à résonance, ce convertisseur bénéficie des nombreux avantages propres à cette structure particulière. C’est ainsi que le prototype réalisé présente un rendement très élevé, une densité de puissance très forte avec des perturbations EMI très réduites. La première partie de cette thèse est consacrée à l’analyse théorique du circuit LLC afin de dégager un modèle de conversion et une stratégie de contrôle adaptée à l’application visée. Afin de conserver un rendement important sur une large plage de charge, une structure basée sur la mise en parallèle de deux modules LLC est proposée. Une nouvelle stratégie de contrôle à deux boucles est également proposée pour équilibrer le courant entre les deux modules. La seconde partie de la thèse fait appel à la simulation et à l’expérimentation. Il s’agit de minimiser la masse et l’encombrement tout en maximisant le rendement. Un composant magnétique spécial est conçu puis dimensionné pour intégrer le transformateur et diverses inductances de résonance. Ce convertisseur met également en œuvre un système de redressement synchrone robuste avec une compensation de phase, un module de puissance avec une résistance thermique très faible et un système de refroidissement efficace par air. Le rendement maximal mesuré est 95%. Le rendement demeure supérieur à 94% sur une plage de puissance s’étalant de 500 W à 2 kW. La densité de puissance est 1W/cm3. La CEM du convertisseur est développée dans cette thèse<br>In this dissertation, a 2.5kW 400V/14V, 250kHz DC/DC converter prototype is developed targeted for electric vehicle/hybrid vehicle applications. Benefiting from numerous advantages brought by LLC resonant topology, this converter is able to perform high efficiency, high power density and low EMI. A first part of this dissertation is the theoretical analysis of LLC: topology analysis, electrical parameter calculation and control strategy. To arrange high output current, this thesis proposes parallel connected LLC structure with developed novel double loop control to realize an equal current distribution. The second part concerns on the system amelioration and efficiency improvement of developed LLC. A special transformer is dimensioned to integrate all magnetic components, and various types of power losses are quantified based on different realization modes and winding geometries to improve its efficiency. This converter also implements a robust synchronous rectification system with phase compensation, a power semiconductor module, and an air-cooling system. The power conversion performance of this prototype is presented and the developed prototype has a peak efficiency of 95% and efficiency is higher than 94% from 500W to 2kW, with a power density of 1W/cm3. The CEM analysis of this converter is also developed in this thesis
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Books on the topic "Current commutation"

1

Wolny, Andrzej. Current breaking through commutation. Wydawn. Politechniki Gdańskiej, 2001.

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Chéron, Yvon. Soft commutation. Chapman & Hall, 1992.

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Sokira, Thomas J. Brushless dc motors: Electronics commutation and controls. Tab Books, 1990.

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La commutation douce dans la conversion statique de l'énergie électrique. Technique et documentation-Lavoisier, 1989.

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Chéron, Yvon. Soft communtation. Chapman & Hall, 1992.

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Self-commutating converters for high power applications. J. Wiley, 2009.

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Li, Weiping, and Shihshu Walter Wei. Geometry and topology of submanifolds and currents: 2013 Midwest Geometry Conference, October 19, 2013, Oklahoma State University, Stillwater, Oklahoma : 2012 Midwest Geometry Conference, May 12-13, 2012, University of Oklahoma, Norman, Oklahoma. American Mathematical Society, 2015.

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Soft Commutation. Springer, 2011.

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Cheron, Y., and Cheran. Soft Commutation. Chapman & Hall, 1996.

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Sokira, Thomas J. Brushless Dc Motors: Electronic Commutation and Controls. Tab Books, 1989.

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Book chapters on the topic "Current commutation"

1

Li, Bin, and Jiawei He. "DC Fault Current Limiting Technique Based on the Current Commutation." In Protection Principle and Technology of the VSC-Based DC Grid. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6644-8_8.

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Das, S. K., and P. Syam. "Analysis of Different Current Commutation Technique in Matrix Converter." In Lecture Notes in Electrical Engineering. Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-2119-7_49.

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Wang, Xuan, Hui Yan, Yuhong Wang, et al. "Processing to the Commutation Failure in Multi-infeed Direct Current System." In Lecture Notes in Electrical Engineering. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-48768-6_32.

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An, Yuejun, Limin Zhou, Wenrui Li, Hui An, and Dan Sun. "Simulation of Improving Commutation on Low-Voltage High-Current Vehicle Generators." In Communications in Computer and Information Science. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31968-6_40.

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Dunca, A., V. John, and W. J. Layton. "The Commutation Error of the Space Averaged Navier-Stokes Equations on a Bounded Domain." In Contributions to Current Challenges in Mathematical Fluid Mechanics. Birkhäuser Basel, 2004. http://dx.doi.org/10.1007/978-3-0348-7877-7_3.

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Yang, Can, Haibo Zhang, Weiyong Jiang, and Yanan Li. "The Effect of Hazheng Ultra High Voltage Direct Current Commutation Failure on Wind Power." In Proceedings of the Second International Conference on Mechatronics and Automatic Control. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13707-0_24.

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Melkebeek, Jan A. "Direct Current Commutator Machines." In Electrical Machines and Drives. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72730-1_2.

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Brylinski, Jean-Luc. "Non-commutative Ruelle-Sullivan type currents." In The Grothendieck Festschrift. Birkhäuser Boston, 2007. http://dx.doi.org/10.1007/978-0-8176-4574-8_11.

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Backelin, Jörgen, Svetlana Cojocaru, and Victor Ufnarovski. "The Computer Algebra Package Bergman: Current State." In Commutative Algebra, Singularities and Computer Algebra. Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-1092-4_4.

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Berenstein, Carlos A., Alekos Vidras, Roger Gay, and Alain Yger. "Applications to Commutative Algebra and Harmonic Analysis." In Residue Currents and Bezout Identities. Birkhäuser Basel, 1993. http://dx.doi.org/10.1007/978-3-0348-8560-7_5.

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Conference papers on the topic "Current commutation"

1

Sarkar, Indrajit, Sumanta Kumar Show, and Prasid Syam. "Stepless current commutation in Matrix Converter." In 2012 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES). IEEE, 2012. http://dx.doi.org/10.1109/pedes.2012.6484287.

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Yasuoka, Koichi, Yuta Yamada, Mo Chen, Ryo Nakayama, Shoya Kubo, and Shungo Zen. "Commutation of Current in a Hybrid DC Switch." In 2019 IEEE 20th International Conference on Dielectric Liquids (ICDL). IEEE, 2019. http://dx.doi.org/10.1109/icdl.2019.8796686.

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Laamiri, Saber, Malek Ghanes, Gaetan Santomenna, and Jesus DeLeon. "Forced commutation for fed current self controlled synchronous motor." In 2015 IEEE Conference on Control Applications (CCA). IEEE, 2015. http://dx.doi.org/10.1109/cca.2015.7320726.

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Hall, Richard D., and Walter J. Konstanty. "Commutation of DC motors operated at reduced field current." In 2009 55th IEEEl Pulp and Paper Industry Technical Conference (PPIC). IEEE, 2009. http://dx.doi.org/10.1109/papcon.2009.5185414.

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Gribble, J. J. "Optimal commutation angles for current controlled switched reluctance motors." In 6th International Conference on Power Electronics and Variable Speed Drives. IEE, 1996. http://dx.doi.org/10.1049/cp:19960893.

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Sun, Haobo, Yu Zhu, Kaiming Yang, and Sen Lu. "Edge Coil Force Fitting and Current Optimal Commutation Algorithm for Magnetic Levitation Planar Motor With Moving Magnet." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23534.

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Abstract In this paper, edge coils are added to the commutation algorithm of the coil array. In order to reduce the theoretical modeling error of the edge coil force, a method of edge coil force fitting based on radial basis function (RBF) network is proposed. The obtained attenuation function of edge force can replace the weighting function in the switching algorithm, so it can effectively reduce the current density of the central coils and the heat loss power of the coil array. On this basis, a non-iterative current optimal commutation algorithm is proposed. The algorithm takes the weighted sum of the 2-norm of the coil current and the 2-norm of the difference between the coil current and the saturation current as the optimization objective, and obtains the analytical expression of the instantaneous current by solving the Karush Kuhn Tucker (KKT) equation. The results of simulation show that, compared with the direct decoupling algorithm with weighting function, the proposed commutation algorithm can reduce the heat loss power of the coil array and allow the translator to provide greater acceleration under the same maximum current limitation.
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Ziegler, Philipp, Nathan Troster, Dimitri Schmidt, Johannes Ruthardt, Manuel Fischer, and Jorg Roth-Stielow. "Wide Bandwidth Current Sensor for Commutation Current Measurement in Fast Switching Power Electronics." In 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe). IEEE, 2020. http://dx.doi.org/10.23919/epe20ecceeurope43536.2020.9215686.

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Jiao, Guandong, and Christopher D. Rahn. "Current Waveform Optimization for Low Noise Permanent Magnet Motors." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33058.

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During torque production, the varying magnetic fields inside an electric motor excite vibration that radiates acoustic noise. In consumer applications, this noise can influence the perceived product quality. Noises from propulsion and auxiliary electric motors on naval vessels create an acoustic signature that increases detectability. The dominant noise occurs at twice the electrical frequency (2E). For permanent magnet (PM) machines, the attraction between the rotor permanent magnets and the stator iron causes a radial force that varies sinusoidally around the stator. The stator coil currents generate a rotating magnetic field that produces rotor torque. This paper develops a new commutation strategy for PM machines that uses higher stator currents to minimize 2E noise by reducing radial force ripple without sacrificing torque. An analytical model is developed that predicts rotor torque and radial force ripple as functions of the stator currents. Based on this model, the phase currents are optimally commutated to maintain constant torque production and reduce force ripple. The optimal commutation is numerically investigated on a small PM motor using ANSYS FEA. The ANSYS results show a 30% reduction in force ripple at no load.
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Cailin Wang, Ruliang Zhang, Yong Gao, and Tao An. "Analysis of current commutation mechanism and design consideration of IGCT." In 2009 IEEE 6th International Power Electronics and Motion Control Conference. IEEE, 2009. http://dx.doi.org/10.1109/ipemc.2009.5157574.

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Matsushita, Akihisa, Kazuyasu Takimoto, Kentaro Suzuki, Hiromichi Tai, Ryoichi Kurosawa, and Isao Kamiyama. "Experimental Verification of Current Source Inverter with ZVS Commutation Circuit." In 2008 IEEE Industry Applications Society Annual Meeting (IAS). IEEE, 2008. http://dx.doi.org/10.1109/08ias.2008.266.

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