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Littérature scientifique sur le sujet « Ac generator »

Auteur : Grafiati
Publié le 4 mai 2024

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Articles de revues sur le sujet "Ac generator"

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Liang-Rui Chen et Neng-Yi Chu. « AC-Powered Pulse Generator ». IEEE Transactions on Plasma Science 34, no 5 (octobre 2006) : 1858–65. http://dx.doi.org/10.1109/tps.2006.883420.

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Honorati, O., C. Caputo, F. Caricchi et E. Santini. « Double armature AC generator ». IEEE Transactions on Energy Conversion 4, no 1 (mars 1989) : 102–8. http://dx.doi.org/10.1109/60.23160.

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Krismadinata, Derry Fiandri, Asnil, Irma Husnaini, Mohd Noor Abdullah et Mukesh Singh. « Voltage and frequency regulation induction generator employing AC-AC converter ». IOP Conference Series : Earth and Environmental Science 1281, no 1 (1 décembre 2023) : 012039. http://dx.doi.org/10.1088/1755-1315/1281/1/012039.

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Abstract One of potential problem in induction generator is voltage and frequency instability. Induction generators (IG) can experience voltage and frequency fluctuations due to changes in the load. This paper presents a control strategy for voltage and frequency regulation of an induction generator using an electronic load controller (ELC). Three-phase AC-AC converter is employed as an ELC. The control system is designed to ensure the steady-state and transient stability of the IG under various operating conditions. The effectiveness of the proposed control method is demonstrated through simulation. MATLAB/Simulink software is utilized to analyze and verified the proposed control method. The simulation results show that it can provide accurate voltage and frequency regulation while maintaining stable operation of the IG. The proposed approach offers a promising solution for IG applications in renewable energy systems, where precise control of voltage and frequency is crucial for efficient and reliable power generation
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Sikorski, A., et M. Korzeniewski. « AC/DC/AC converter in a small hydroelectric power plant ». Bulletin of the Polish Academy of Sciences : Technical Sciences 59, no 4 (1 décembre 2011) : 507–11. http://dx.doi.org/10.2478/v10175-011-0062-6.

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AC/DC/AC converter in a small hydroelectric power plant The article discusses application of AC/DC/AC converter cooperating with an induction generator in small hydroelectric power plants. The induction generator works with power grid or a separated group of receivers, enabling to generate power even at low speeds of the turbine. The article provides also results of the investigation concerning the functioning of the generator coupled with AC/DC/AC converter in steady and transient states during start-up and voltage decay.
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Kumagai, M., T. Tanaka, K. Ito, Y. Watanabe, K. Sato et Y. Gocho. « Development of Superconducting AC Generator ». IEEE Transactions on Energy Conversion EC-1, no 4 (décembre 1986) : 122–29. http://dx.doi.org/10.1109/tec.1986.4765785.

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Kumagai, M., T. Tanaka, K. Ito, Y. Watanabe, K. Sato et Y. Gocho. « Development of Superconducting AC Generator ». IEEE Power Engineering Review PER-6, no 12 (décembre 1986) : 48–49. http://dx.doi.org/10.1109/mper.1986.5528072.

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Maki, N., K. Yamaguchi, M. Takahashi et R. Shiobara. « Development of superconducting AC generator ». IEEE Transactions on Magnetics 24, no 2 (mars 1988) : 792–95. http://dx.doi.org/10.1109/20.11343.

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Supriyatna, Deddy. « Analysis of Power Efficiency Produced by AC and DC Generators : A Literature Review ». MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering 5, no 2 (12 mars 2023) : 261–68. http://dx.doi.org/10.46574/motivection.v5i2.211.

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In the life of the modern era, electricity has become one of the supporters of the energy supply to meet all of human's daily needs. Electricity can be generated from the conversion of natural energy such as sunlight, wind, coal and so on. Generators have become modern renewal machines that can convert mechanical energy into electrical energy. Generator with a work system that utilizes wire coils as a conductor of electricity and the stator and rotor work continuously to convert motion energy into electrical energy. This study aims to answer the problem regarding the efficiency between the two types of AC and DC dynamos. As well as to find out which type of dynamo is suitable for a particular electrical component. The data collection technique was carried out using a System Literature Review (SLR) which was used to identify and study theoretically the power efficiency generated by AC and DC generator dynamos. Dalam kehidupan era modern, listrik telah menjadi salah satu penyokong suplai energi untuk memenuhi semua kebutuhan manusia sehari-hari. Listrik bisa dihasilkan dari konversi energi alam seperti cahaya matahari, angin, batu bara dan sebagainya. Generator telah menjadi mesin pembaruan modern yang dapat mengubah energi mekanik menjadi energi listrik. Generator dengan sistem kerja yang memanfaatkan lilitan kawat sebagai penghantar listrik dan stator serta rotor yang bekerja terus menerus untuk mengkonversi energi gerak menjadi energi listrik. Penelitian ini bertujuan untuk menjawab permasalahan menngenai efisiensi antara kedua jenis dinamo AC dan DC. Serta untuk mengetahui dinamo tipe mana yang cocok untuk sebuah komponen listrik tertentu. Teknik pengumpulan data dilakukan dengan System Literature Review (SLR) yang digunakan untuk mengidentifikasi serta mengkaji secara teori mengenai efisiensi daya yang dihasilkan dinamo generator AC dan DC.
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Noda, Kaito, Hiromasa Sasa, Hiroshi Miyazaki, Shun Miura, Takashi Yoshida, Teruyoshi Sasayama, Masataka Iwakuma et al. « Numerical simulation of a high-power density 10 MW REBCO superconducting synchronous generator cooled by sub-cooled LN2 for low AC loss ». Journal of Physics : Conference Series 2323, no 1 (1 août 2022) : 012037. http://dx.doi.org/10.1088/1742-6596/2323/1/012037.

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Abstract Generators used in electric aircraft require a high-power density, and AC loss is also a significant problem. We designed 10 MW REBCO superconducting synchronous generators at 64 K to achieve a power density of 20 kW/kg and low AC loss. In this study, electromagnetic analyses were performed using finite element method software. Consequently, the thickness of the back yoke is 50 mm or less so that the generator can meet the target power density. The method of decreasing the magnetic field of the armature winding and increasing that of the field winding was used to effectively reduce the AC loss. As a result, the generator achieved a high-power density of 21.0 kW/kg, reducing the AC loss from over 600 kW to 415 kW.
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Pei, Wei, Geng Liang, Xuying Gao et Xiangyu Feng. « Research on AC Excitation Regulation Control System for Synchronous Generators ». Academic Journal of Science and Technology 6, no 2 (27 juin 2023) : 31–34. http://dx.doi.org/10.54097/ajst.v6i2.9441.

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Although there are many methods for classifying the excitation systems of synchronous motors, there are three types of excitation systems for synchronous motors based on the numerous methods of providing excitation power to synchronous generators. One is a DC excitation system, the second is an AC excitation system, and the other is a static excitation system. This paper mainly studies the AC excitation system. The rotor speed of AC excited generators is variable and has excellent characteristics such as improving power system stability, allowing for deep operation without losing step. AC excitation generators not only have variable speed and constant frequency power, but also have independent adjustment functions for speed, reactive power, and effective power. The use of high-performance variable frequency excitation power supplies and appropriate excitation control methods can maximize the reliability, operational flexibility, and exceptional adjustment performance of AC excitation generators. The excitation system is an important part of synchronous generator operation. A good excitation system not only ensures the stable and reliable operation of the generator, but also greatly improves the stability of the motor and power system.
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Thèses sur le sujet "Ac generator"

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Hu, Jiangang. « Sensorless control of AC machines for integrated starter generator application ». Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1196258873.

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Yon, Jason M. « Variable frequency AC from a shunt regulated permanent magnet generator ». Thesis, University of Bristol, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.682723.

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The aviation industry is in the process of developing the All-Electric-Aircraft through a succession of increasingly More-Electric-Aircraft. Through this evolution, previously pneumatically or hydraulically powered functions are being implemented by electrical systems. This requires an increase in electrical power generation and distribution. To meet this increasing demand at competitive power densities, a change of generator technology may soon be required. Permanent Magnet (PM) machines, due to their power density, efficiency and simple robust construction, are a strong candidate technology for future aircraft electrical power generation. A variable frequency AC system based around a non-salient PM machine and a parallel shunt regulator is assessed and analysed to examine the effect of generator electromagnetic parameters on the rating of the regulator. With the correct pairing of PM machine and converter, it is anticipated that a system could be conceived which provides the necessary performance to meet the coming needs of the evolving aerospace industry at a competitive mass density. Key to achieving an optimised converter is the realisation of a machine with a specific PM flux linkage and inductance. Surface mounted PM machines offer a robust and simple machine construction. This topology is often employed where electromagnetic saliency is not required. However, their design is currently constrained by the effect of rotor containment structures on the machine's magnetic circuit. Alternative containment materials with a degree of magnetic permeability are calculated to reduce the effective air-gap usually presented by the containment material. Cold-rolled AISI 304L stainless steel exhibits such magnetic propelties. A prototype rotor is constructed incorporating a containment sleeve constructed of this material in a laminated construction. The machine is then tested to verify the analysis and to demonstrate shunt regulation of a PM generator. A further investigation is then conducted to assess the suitability of salient machine designs for operation as shunt regulated generators before conclusions are drawn and suggestions for future research are proposed.
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Coombe, H. Scott. « Development of a dynamic model of a mechanically driven polyphase AC generator / ». This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-03172010-020029/.

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Lopez, Santos Oswaldo. « Contribution to the DC-AC conversion in photovoltaic systems : Module oriented converters ». Thesis, Toulouse, INSA, 2015. http://www.theses.fr/2015ISAT0001/document.

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Ces dernières années, un intérêt croissant pour les systèmes électroniques de puissance a été motivé par l'émergence de sources d'énergie distribuées et renouvelables raccordées aux réseaux électriques. Dans ce contexte, la nécessité de topologies de faibles puissances alimentées par quelques modules photovoltaïques, en évitant l'utilisation de transformateurs, a ouvert l'étude de convertisseurs spéciaux et l’étude des stratégies de commande associées afin d’assurer la stabilité, la fiabilité et un rendement élevé du dispositif. Une possible solution est d’utiliser un dispositif générique connu dans la littérature scientifique et commerciale comme « micro-onduleur » ou «convertisseur intégré au module » qui avec le module photovoltaïque définit un produit « plug and play » appelé "module AC".Ce travail est consacré à l'étude d'un micro-onduleur monophasé avec deux étapes sans transformateur raccordée au réseau. La topologie proposée est composé d’un convertisseur DC-DC non isolé élévateur avec un gain quadratique et un onduleur réducteur lié au réseau connectés en cascade. Le convertisseur DC-DC extrait en permanence la puissance maximale du module photovoltaïque malgré les changements dans les conditions environnementales. L'étape DC-AC injecte la puissance extraite par l'étape DC-DC dans le réseau et assure un niveau élevé de qualité de l’énergie. Les efforts de recherche de ce travail sont concentrés sur la mise au point de commandes utilisant comment base, la théorie de contrôle par mode de glissement, qui conduit à une mise en œuvre simple avec une description théorique complète validée á partir de simulations et expérimentations.Après avoir décrit l'état de l’art dans le premier chapitre, le manuscrit est divisé en quatre chapitres, qui sont dédiés respectivement à l’algorithme de recherche du point de puissance maximale (MPPT), á l’étape de conversion DC-DC, á l'étape de conversion DC-AC et finalement au micro-onduleur complet. Un nouvel algorithme de recherche extrémal du point de puissance maximale est développé (SM-ESC). Pour la étape DC-DC, le convertisseur élévateur quadratique avec seulement un interrupteur contrôlé est étudié utilisant le concept de résistance sans perte par mode de glissement (de l’acronyme anglais : Sliding-Mode Loss-Free-Resistor – SM-LFR) afin d’obtenir un gain de tension élevé avec un fonctionnement sûr et compatible avec l’algorithme MPPT. Pour la étape DC-AC, le convertisseur de pont complet est contrôlé comme un onduleur de source de puissance (de l’acronyme anglais : Power Source Inverter - PSI) en utilisant une commande par mode de glissement qui poursuit une référence sinusoïdale de courant de sortie. Cette commande est complétée par une boucle de régulation de la tension du bus DC qui assure une haute qualité d’énergie injectée dans le réseau. Enfin, les trois étapes constitutives sont fusionnées pour obtenir un micro-onduleur complètement contrôlé par la technique de mode de glissement, ce qui constitue le principal résultat et contribution de cette thèse
These last years, a growing interest in power electronic systems has been motivated by the emergence of distributed renewable energy resources and their interconnection with the grid. In this context, the need of low power topologies fed by a few photovoltaic modules avoiding the use of transformers opens the study of special converters and the associated control strategies ensuring stability, reliability and high efficiency. A resulted generic device known in the commercial and scientific literature as “microinverter” or “module integrated converter” performs a plug and play product together with the PV module called an “AC module”.This work is devoted to the study of a transformer-less single-phase double-stage grid-connected microinverter. The proposed topology has a non-isolated high-gain boost type DC-DC converter and a non-isolated buck type DC-AC converter connected in cascade through a DC bus. The DC-DC converter permanently extracts the maximum power of the PV module ensuring at the same time a good performance coping with power changes introduced by the change in the environmental conditions. The DC-AC stage injects the power extracted by the DC-DC stage into the grid ensuring a high level of power quality. The research efforts focus on the involved control functions based on the sliding mode control theory, which leads to a simple implementation with a comprehensive theoretical description validated through simulation and experimental results.After giving the state-of-the-art in the first chapter, the manuscript is divided into four chapters, which are dedicated to the Maximum Power Point Tracking (MPPT), the DC-DC stage and its control, the DC-AC stage and its control and the complete microinverter. A new Extremum Seeking Control (ESC) MPPT algorithm is proposed. The single-switch quadratic boost converter is studied operating as a Loss-Free-Resistor (LFR) obtaining a high DC output voltage level with a safe operation. The full-bridge converter is controlled as a Power Source Inverter (PSI) using a simple sliding-mode based tracking law, regulating the voltage of the DC bus and then ensuring a high power quality level in the grid connection. Finally, the three building blocks are merged to obtain a sliding mode controlled microinverter constituting the main result and contribution of the work
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Elmes, John. « MAXIMUM ENERGY HARVESTING CONTROL FOROSCILLATING ENERGY HARVESTING SYSTEMS ». Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3400.

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This thesis presents an optimal method of designing and controlling an oscillating energy harvesting system. Many new and emerging energy harvesting systems, such as the energy harvesting backpack and ocean wave energy harvesting, capture energy normally expelled through mechanical interactions. Often the nature of the system indicates slow system time constants and unsteady AC voltages. This paper reveals a method for achieving maximum energy harvesting from such sources with fast determination of the optimal operating condition. An energy harvesting backpack, which captures energy from the interaction between the user and the spring decoupled load, is presented in this paper. The new control strategy, maximum energy harvesting control (MEHC), is developed and applied to the energy harvesting backpack system to evaluate the improvement of the MEHC over the basic maximum power point tracking algorithm.
M.S.E.E.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering MSEE
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Jarosz, Antoine. « Étude de la température et des vibrations des développantes d'alternateur hydraulique ». Grenoble INPG, 1998. http://www.theses.fr/1998INPG0138.

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Ce mémoire concerne l'étude des contraintes mécaniques et thermiques que subit l'isolation statorique des alternateurs de centrale hydraulique. La zone plus particulièrement étudiée est la partie frontale des machines. Ainsi, dans le premier chapitre, il est rappelé la structure du bobinage statorique et l'ensemble des contraintes pouvant l'affecter. Cette première partie s'achève par une présentation des systèmes de maintenance prédictive et de leurs limites actuelles. Le deuxième chapitre concerne l'étude du comportement mécanique des développantes d'un alternateur hydraulique. La prise en compte de la non-homogénéité des matériaux par des modèles linéiques et volumiques ainsi que, la géométrie de cette structure sont décrites en détail-Ces modèles sont ensuite appliqués pour analyser qualitativement les déformées modales d'une seule développante puis, de l'ensemble du bobinage. Le troisième chapitre aborde la mesure expérimentale des températures et vibrations de trois alternateurs-moteurs utilisés dans des conditions usuelles de production d'énergie électrique. A partir de plusieurs enregistrements du régime permanent, il est clairement montré que l'isolation possède des propriétés viscoélastiques. Parallèlement, l'étude des régimes transitoires (démarrages et arrêts) nous indique que : * les efforts exercés sur les développantes sont principalement d'origine électromagnétique * l'utilisation du freinage électrique lors des phases d'arrêt peut exciter des modes propres de la machine et ainsi engendrer des niveaux vibratoires très élevés Le dernier chapitre présente un banc d'essai muHicontraintes capable de reproduire, sur un fragment de conducteur, les contraintes mécaniques, thermiques et électriques observées sur un alternateur. Les choix technologiques retenus sont justifiés et illustrés par plusieurs photographies. Enfin, une méthode analytique pour déduire le niveau des contraintes mécaniques dans l'isolation est proposée et validée expérimentalement
This thesis deals with thermal and mechanical stress that undergoes hydrogenerators stator insulation. More precisely, this study concems the stator endwinding zone. Thus, ail over the first chapter, stator winding structure and insulation stresses are described. This first part is concluded by a short présentation of on-line monitoring Systems and some pièces of information about their présent limits. The second chapter concems mechanical behavior of hydrogenerator endwindings. Materials non-homogeneity is taken account by three-dimensional and straight beam models moreover, endwinding geometry is described in détail. In the following step, thèse meihods are applied to analyse a single endwinding and the whole winding eigenforms. The third chapter contains a vibrations and température expérimental study of three generators-motors used in power generating units. Front the study of many steady-state recordings, insulation viscoelastic properties are proved. In the same way, mechanical transient analysis (starts and stops) shows that : * endwinding forces hâve mainly electromagnetic origins * the electrical braking during the stop séquences may lead to high vibration levels caused by machine naturel frequencies The last chapter purpose is to présent an expérimental testing bench able to repnoduce, on a short part of a generator bar, thermal, mechanical and high voltage stresses measured on real machines. Technological solutions chosen are justified and illustrated by many pictures. To conclude, an analytical method for predicting insulation mechanical stress level is proposed and compared with expérimental data
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Phan, Anh Minh. « Optimisation énergétique des groupes turbine-alternateur-convertisseur à vitesse variable ». Grenoble INPG, 1998. http://www.theses.fr/1998INPG0031.

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La valorisation technico-economique des projets de centrales hydroelectriques depend des ressources hydrauliques disponibles et aussi des procedures d'exploitation utilisees en fonction de la puissance electrique demandee. Classiquement les groupes hydroelectriques sont exploites a vitesse de rotation constante, synchrone avec la frequence du reseau. Grace aux progres de l'electronique de puissance, il est maintenant possible d'utiliser des convertisseurs de frequences jusqu'a des puissances tres importantes et donc de faire fonctionner les turbines hydrauliques a vitesse variable. Ce nouveau degre de liberte permet d'obtenir un rendement du groupe turbine-alternateur-convertisseur le plus souvent superieur a l'ensemble turbine-alternateur a vitesse constante. Pour justifier l'installation d'un tel convertisseur, il est necessaire de verifier que le gain lie a la variation de vitesse compense le surcout correspondant. Dans ce memoire, on a developpe un modele global parametrique du fonctionnement du groupe turbine-alternateur-convertisseur. Le modele de la turbine est base sur la parametrisation des pertes a partir de mesures experimentales. L'alternateur est modelise a partir d'une structure theorique classique dont les coefficients sont obtenus par des essais sur prototype ou sur modele. Le convertisseur est represente par un modele sequentiel. Une procedure propose par l'auteur permet de trouver le reglage optimal de chaque element de l'ensemble complet compte tenu du potentiel hydraulique et de la demande de puissance electrique. Par simulation, il est alors possible de determiner le productible annuel de la centrale. Cette etude a ete testee et validee sur une installation experimentale de laboratoire equipee d'une turbine francis de 5 kw. Cette analyse a ensuite ete appliquee a un site reel presentant de grandes variations annuelles de chutes. Le productible annuel avec cette methode a ete compare a la simulation a frequence constante. Le gain energetique ainsi obtenu est un facteur important pour l'aide a la decision base des consideration technico-economique.
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Chen, Jianyi. « Performance enhancement of AC machines and permanent magnet generators for sustainable energy applications ». Thesis, Curtin University, 1999. http://hdl.handle.net/20.500.11937/1663.

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Sustainable energy solutions are aimed to reduce the consumption of fossil fuels by using renewable energy sources and energy efficiency techniques. This thesis presents two new sustainable energy applications in the field of electrical machines.Polyphase induction motors dominate the energy usage spectrum for industrial and commercial applications. The conventional winding structure used in both synchronous and induction machines has a basic unit of the winding with a 60 degree phase belt and a three phase connection either in star or delta. A new winding structure using an innovative Star-Delta Series Connection (SDSC) which has a high winding coefficient and low harmonic content is presented in this thesis. The principle of the SDSC winding is described. The Electro-Magnetic Belt and Electro-Magnetic Space diagram are two important means to be used for optimization of the new winding. Experimental results from two prototypes confirm the theoretical analysis. The efficiency of the new machine at rated load increased by about 3.8% as compared to the standard machine with a conventional winding structure.Wind energy is one of the most attractive renewable energy options. Wind turbines are designed to couple either synchronous or asynchronous generators with various forms of direct or indirect connection with grid or diesel generators. Permanent magnet (PM) generators using high energy Neodymium- Iron-Boron magnets offer advantages such as direct coupling without gear box, absence of excitation winding and slip rings, light weight and smaller size. This thesis presents the design and development of an outer-rotor PM generator suitable for wind energy conversion. The initial electromagnetic design followed by a Finite Element Analysis is presented in detail. A 20 kW prototype machine was built and extensively tested. It was found that the machine could maintain an efficiency of about 85% for a wide operating range. Equivalent circuit models were developed. The results of the Finite Element analysis matches closely with the experimental and the designed values.
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Adabi, Firouzjaee Jafar. « Remediation strategies of shaft and common mode voltages in adjustable speed drive systems ». Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/39293/1/Jafar_Adabi_Firouzjaeel_Thesis.pdf.

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AC motors are largely used in a wide range of modern systems, from household appliances to automated industry applications such as: ventilations systems, fans, pumps, conveyors and machine tool drives. Inverters are widely used in industrial and commercial applications due to the growing need for speed control in ASD systems. Fast switching transients and the common mode voltage, in interaction with parasitic capacitive couplings, may cause many unwanted problems in the ASD applications. These include shaft voltage and leakage currents. One of the inherent characteristics of Pulse Width Modulation (PWM) techniques is the generation of the common mode voltage, which is defined as the voltage between the electrical neutral of the inverter output and the ground. Shaft voltage can cause bearing currents when it exceeds the amount of breakdown voltage level of the thin lubricant film between the inner and outer rings of the bearing. This phenomenon is the main reason for early bearing failures. A rapid development in power switches technology has lead to a drastic decrement of switching rise and fall times. Because there is considerable capacitance between the stator windings and the frame, there can be a significant capacitive current (ground current escaping to earth through stray capacitors inside a motor) if the common mode voltage has high frequency components. This current leads to noises and Electromagnetic Interferences (EMI) issues in motor drive systems. These problems have been dealt with using a variety of methods which have been reported in the literature. However, cost and maintenance issues have prevented these methods from being widely accepted. Extra cost or rating of the inverter switches is usually the price to pay for such approaches. Thus, the determination of cost-effective techniques for shaft and common mode voltage reduction in ASD systems, with the focus on the first step of the design process, is the targeted scope of this thesis. An introduction to this research – including a description of the research problem, the literature review and an account of the research progress linking the research papers – is presented in Chapter 1. Electrical power generation from renewable energy sources, such as wind energy systems, has become a crucial issue because of environmental problems and a predicted future shortage of traditional energy sources. Thus, Chapter 2 focuses on the shaft voltage analysis of stator-fed induction generators (IG) and Doubly Fed Induction Generators DFIGs in wind turbine applications. This shaft voltage analysis includes: topologies, high frequency modelling, calculation and mitigation techniques. A back-to-back AC-DC-AC converter is investigated in terms of shaft voltage generation in a DFIG. Different topologies of LC filter placement are analysed in an effort to eliminate the shaft voltage. Different capacitive couplings exist in the motor/generator structure and any change in design parameters affects the capacitive couplings. Thus, an appropriate design for AC motors should lead to the smallest possible shaft voltage. Calculation of the shaft voltage based on different capacitive couplings, and an investigation of the effects of different design parameters are discussed in Chapter 3. This is achieved through 2-D and 3-D finite element simulation and experimental analysis. End-winding parameters of the motor are also effective factors in the calculation of the shaft voltage and have not been taken into account in previous reported studies. Calculation of the end-winding capacitances is rather complex because of the diversity of end winding shapes and the complexity of their geometry. A comprehensive analysis of these capacitances has been carried out with 3-D finite element simulations and experimental studies to determine their effective design parameters. These are documented in Chapter 4. Results of this analysis show that, by choosing appropriate design parameters, it is possible to decrease the shaft voltage and resultant bearing current in the primary stage of generator/motor design without using any additional active and passive filter-based techniques. The common mode voltage is defined by a switching pattern and, by using the appropriate pattern; the common mode voltage level can be controlled. Therefore, any PWM pattern which eliminates or minimizes the common mode voltage will be an effective shaft voltage reduction technique. Thus, common mode voltage reduction of a three-phase AC motor supplied with a single-phase diode rectifier is the focus of Chapter 5. The proposed strategy is mainly based on proper utilization of the zero vectors. Multilevel inverters are also used in ASD systems which have more voltage levels and switching states, and can provide more possibilities to reduce common mode voltage. A description of common mode voltage of multilevel inverters is investigated in Chapter 6. Chapter 7 investigates the elimination techniques of the shaft voltage in a DFIG based on the methods presented in the literature by the use of simulation results. However, it could be shown that every solution to reduce the shaft voltage in DFIG systems has its own characteristics, and these have to be taken into account in determining the most effective strategy. Calculation of the capacitive coupling and electric fields between the outer and inner races and the balls at different motor speeds in symmetrical and asymmetrical shaft and balls positions is discussed in Chapter 8. The analysis is carried out using finite element simulations to determine the conditions which will increase the probability of high rates of bearing failure due to current discharges through the balls and races.
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Chen, Jianyi. « Performance enhancement of AC machines and permanent magnet generators for sustainable energy applications ». Curtin University of Technology, School of Electrical and Computer Engineering, 1999. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=10442.

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Sustainable energy solutions are aimed to reduce the consumption of fossil fuels by using renewable energy sources and energy efficiency techniques. This thesis presents two new sustainable energy applications in the field of electrical machines.Polyphase induction motors dominate the energy usage spectrum for industrial and commercial applications. The conventional winding structure used in both synchronous and induction machines has a basic unit of the winding with a 60 degree phase belt and a three phase connection either in star or delta. A new winding structure using an innovative Star-Delta Series Connection (SDSC) which has a high winding coefficient and low harmonic content is presented in this thesis. The principle of the SDSC winding is described. The Electro-Magnetic Belt and Electro-Magnetic Space diagram are two important means to be used for optimization of the new winding. Experimental results from two prototypes confirm the theoretical analysis. The efficiency of the new machine at rated load increased by about 3.8% as compared to the standard machine with a conventional winding structure.Wind energy is one of the most attractive renewable energy options. Wind turbines are designed to couple either synchronous or asynchronous generators with various forms of direct or indirect connection with grid or diesel generators. Permanent magnet (PM) generators using high energy Neodymium- Iron-Boron magnets offer advantages such as direct coupling without gear box, absence of excitation winding and slip rings, light weight and smaller size. This thesis presents the design and development of an outer-rotor PM generator suitable for wind energy conversion. The initial electromagnetic design followed by a Finite Element Analysis is presented in detail. A 20 kW prototype machine was built and extensively tested. It was found that the machine could maintain an ++
efficiency of about 85% for a wide operating range. Equivalent circuit models were developed. The results of the Finite Element analysis matches closely with the experimental and the designed values.
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Livres sur le sujet "Ac generator"

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Corporation, Intertec Publishing, dir. Small AC generator service manual. 2e éd. Overland Park, KS : Intertec Publishing Corp., 1986.

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Corporation, Intertec Publishing, dir. Small AC generator service manual. 3e éd. Overland Park, KS : Intertec Pub. Corp., 1991.

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L, Park Gerald, et United States. National Aeronautics and Space Administration, dir. AC motor and generator requirements for isolated WECS. East Lansing, Mich : Michigan State University, Division of Engineering Research, 1985.

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IEEE Power Engineering Society. Switchgear Committee. et IEEE Standards Board, dir. IEEE standard for AC high-voltage generator circuit breakers rated on a symmetrical current. New York, N.Y : The Institute of Electrical and Electronics Engineers, 1997.

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IEEE Power Engineering Society. Switchgear Committee. et IEEE Standards Board, dir. IEEE standard for AC high-voltage generator circuit breakers rated on a symmetrical current basis. New York, N.Y., USA : The Institute of Electrical and Electronics Engineers, 1989.

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Irfan, Alan, University of Wisconsin--Madison et Lewis Research Center, dir. System and component design and test of a 10 HP, 18,000 RPM dynamometer utilizing a high frequency AC voltage link. Madison, WI : University of Wisconsin, Dept. of Electrical and Computer Engineering, 1991.

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IEEE Power Engineering Society. Energy Development and Power Generation Committee. et IEEE Standards Board, dir. IEEE recommended practice for excitation system models for power system stability studies. New York, N.Y : Institute of Electrical and Electronics Engineers, 1992.

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C, Payne John. Understanding boat AC power systems : (generators, inverters, shore power). Dobbs Ferry, NY : Sheridan House, 2008.

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Jeff, Keljik, dir. Electricity 4 : AC/DC motors, controls, and maintenance. 6e éd. Albany, NY : Delmar Publishers, 1996.

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Keljik, Jeff. Electricity 4 : AC/DC motors, controls, and maintenance. 9e éd. Clifton Park, NY : Delmar Cengage Learning, 2009.

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Chapitres de livres sur le sujet "Ac generator"

1

Patel, Mukund R. « AC Generator ». Dans Shipboard Electrical Power Systems, 77–105. 2e éd. Boca Raton : CRC Press, 2021. http://dx.doi.org/10.1201/9781003191513-4.

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Muta, I., H. Tsukiji, Y. Tsutsui, T. Hoshino, E. Mukai et T. Furukawa. « Fully Superconducting AC Generator with Brushless Excitation System ». Dans 11th International Conference on Magnet Technology (MT-11), 568–73. Dordrecht : Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0769-0_98.

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Yan, Zexin, Chi Ma, Boyu Zhang, Zihan Sun et Jiangtao Li. « Design of AC Air Arc Generator Power Supply ». Dans Lecture Notes in Electrical Engineering, 560–69. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1870-4_60.

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Hahn, Songyop, Dongchul Han, Hyochul Sin, Byoungsuk Lee, Gueesoo Cha, Sungchin Hahn et Youngjin Won. « Finite Element Modelling of Electromagnetic Shields in Superconducting AC Generator ». Dans 11th International Conference on Magnet Technology (MT-11), 540–44. Dordrecht : Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0769-0_93.

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Singh, P. Devachandra, et Sarsing Gao. « Sustainable and Renewable Isolated Microhydropower Generation Using a Variable Asynchronous Generator Controlled by a Fuzzy PI AC–DC–AC Converter and D-STATCOM ». Dans Green Engineering and Technology, 103–20. First edition. | Boca Raton : CRC Press, 2021. | : CRC Press, 2021. http://dx.doi.org/10.1201/9781003176275-7.

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Abu-Siada, Ahmed. « Preface ». Dans Recent Advances in Renewable Energy, i. UAE : Bentham Science Publishers Ltd., 2017. http://dx.doi.org/10.2174/9781681085425117020001.

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Due to the continuous resources’ reduction and cost increase of conventional fossil fuel along with the global trend to decrease the greenhouse effect, clean energy production from renewable sources has been given a global great concern. Among renewable energy sources, wind energy conversion systems have received a worldwide notable attention. It is expected that more than 10% of the global electricity demand will to be generated by wind energy conversion systems by the year 2020. During their early implementation stage, wind turbines were to be disconnected during abnormal and fault conditions within the electricity grid it is connected to. Owing to the fact that current wind installations supply a significant portion of the load demand, disconnecting windfarms may lead to business interruption and discontinuity of power supply to the end user. As such, transmission line operators have developed strict grid codes that wind turbine generator must meet to maintain its connection to support the grid during various fault conditions. To comply with these codes, flexible AC transmission systems have been widely used with current wind energy conversion systems to modulate reactive and/or active power at the point of common coupling of the wind turbine generator and the grid. This book presents the applications of various flexible ac transmission system devices to wind energy conversion systems. Devices such as unified power flow controllers, superconducting magnetic energy storage and static synchronous compensator are covered in this book. Topologies, control systems along with case studies of the aforementioned devices are presented and discussed. This book will be useful for postgraduate research students, upper-division electrical engineering students and practicing engineers.
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Chen, Bo, Jiacun Sun, Hejuan Chen, Jian Yang et Wei Qu. « Single-Phase AC Voltage Control Circuit for Flow-Induced Acoustic-Vibration Piezoelectric Generator ». Dans Lecture Notes in Electrical Engineering, 127–35. Berlin, Heidelberg : Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-48768-6_15.

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Walker, M. S., J. H. Murphy, Y. W. Chang et H. E. Haller. « Alternating Field Losses in the Superconductor for a Large High-Speed AC Generator ». Dans Advances in Cryogenic Engineering, 59–66. Boston, MA : Springer US, 1995. http://dx.doi.org/10.1007/978-1-4613-9847-9_8.

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Ghosh, Saikat, et S. N. Mahato. « Modeling and Control Topology of Multiphase Induction Generator for Supplying AC and DC Power Simultaneously ». Dans Lecture Notes in Electrical Engineering, 329–40. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1978-6_29.

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Kumar, Abhinandan, et T. Ghose. « Sensitivity Factor Analysis of Hybrid AC–DC Distribution System and Overload Alleviation Using Modified Generator Shift Distribution Factor ». Dans Advances in Smart Grid Automation and Industry 4.0, 777–85. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-7675-1_78.

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Actes de conférences sur le sujet "Ac generator"

1

Soong, Wen L., Solmaz Kahourzade, Chong-Zhi Liaw et Paul Lillington. « Interior PM generator for portable AC generator sets ». Dans 2014 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2014. http://dx.doi.org/10.1109/ecce.2014.6953563.

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Godoy, R. B., G. Pires, M. Portela, R. Fernandes, F. de Seixas, G. Melo et C. A. Canesin. « A HPF AC-AC converter for permanent magnet generator applications ». Dans 2010 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM 2010). IEEE, 2010. http://dx.doi.org/10.1109/speedam.2010.5542286.

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Cotner, Scott. « Insulation testing of AC generator windings ». Dans 2017 IEEE Electrical Insulation Conference (EIC). IEEE, 2017. http://dx.doi.org/10.1109/eic.2017.8004652.

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Haq, Muhammad Aziz Ul, Hifsa Iram et AzazUl Haq. « Smart solar AC generator without inverter ». Dans 2015 Power Generation Systems and Renewable Energy Technologies (PGSRET). IEEE, 2015. http://dx.doi.org/10.1109/pgsret.2015.7312205.

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Ji, Guyuan, et Kazuhiro Ohyama. « Simulation of Wind Power Generation System Using Switched Reluctance Generator and Capacitor-less AC-AC converter ». Dans 2018 International Power Electronics Conference (IPEC-Niigata 2018-ECCE Asia). IEEE, 2018. http://dx.doi.org/10.23919/ipec.2018.8507528.

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Alexeff, I., J. Brickey et S. Mitchell. « An electrodeless AC MHD generator and pump ». Dans 1990 Plasma Science IEEE Conference Record - Abstracts. IEEE, 1990. http://dx.doi.org/10.1109/plasma.1990.110585.

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Andrea, Jonathan, Patrick Schweitzer, Etienne Tisserand, Patrice Roth et Serge Weber. « Calibrated AC and DC Arcing Fault Generator ». Dans 2010 IEEE Holm Conference on Electrical Contacts (Holm 2010). IEEE, 2010. http://dx.doi.org/10.1109/holm.2010.5619542.

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Loddick, S. « Active stator, a new generator topology for direct drive permanent magnet generators ». Dans 9th IET International Conference on AC and DC Power Transmission (ACDC 2010). IET, 2010. http://dx.doi.org/10.1049/cp.2010.0978.

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Zharkov, Maksim A., Regina Yu Dubkova, Vadim E. Sidorov et Sergey A. Kharitonov. « Starter-Generator System for Gas Turbine Engine Based on AC-AC Converter ». Dans 2019 International Conference on Electrotechnical Complexes and Systems (ICOECS). IEEE, 2019. http://dx.doi.org/10.1109/icoecs46375.2019.8949949.

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Singh, N. K., J. E. Fletcher, S. J. Finney, D. M. Grant et B. W. Williams. « A novel switched reluctance generator inverter topology for AC power generation ». Dans 3rd IET International Conference on Power Electronics, Machines and Drives (PEMD 2006). IEE, 2006. http://dx.doi.org/10.1049/cp:20060067.

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