Relevant bibliographies by topics / Static frequency converter

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

Academic literature on the topic 'Static frequency converter'

Author: Grafiati
Published: 4 June 2021
Last updated: 26 January 2023

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Journal articles on the topic "Static frequency converter"

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CALININ, Lev, Dmitrii ZAITEV, Mihai TIRSU, Irina GOLUB, and Danila KALOSHIN. "Characteristics of two channel static frequency converter." EMERG - Energy. Environment. Efficiency. Resources. Globalization 7, no. 3 (2021): 62–74. http://dx.doi.org/10.37410/emerg.2021.3.05.

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Baraston, Arnaud, Laurent Gerbaud, and Jean-Luc Schanen. "Design by optimization of controlled static converters with EMC filters in aeronautics." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, no. 2 (March 5, 2018): 591–602. http://dx.doi.org/10.1108/compel-12-2016-0522.

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PurposeWith the increasing number of onboard controlled static converters in aeronautics, methods to design lighter configurations are required. This study aims to help the designer sizing optimal electromagnetic compatibility (EMC) filters and, moreover, finding optimal voltage levels and switching frequency, which have a great impact on the design and global mass of such converters. Design/methodology/approachAnalytical models for capacitors, inductors and heatsink are settled. Using frequency modeling, EMC can be studied analytically. To deal with frequency and voltages variations, models of perturbations sources are developed. Concerning the problem of surveilling thousands of harmonics to check the whole frequency range of EMC standards in optimization, a strategy that drastically reduces the number of computations and has a good convergence is proposed. FindingsThe methods settled in the paper allow to optimize a controlled static converter with its EMC filters along with finding optimal switching frequency and voltage levels. A study on a three-phase rectifier reveals the importance of the switching frequency on converter design with EMC filters. A 28 per cent mass reduction is predicted by increasing the switching frequency from 10 to 30 kHz. The designed converters are verified by simulations. Research limitations/implicationsInvestigating the voltage levels along with the switching frequency has not been achieved yet for static controlled converters with EMC constraints. The approach lacks experimental validations, but it is currently ongoing. Originality/valueDealing analytically with the changes of frequency or voltages in an EMC study is a new feature. The possibility to use deterministic algorithm is essential for dealing with the important number of constraints and the numerous interactions between all the parts of the problem, especially EMC.
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Kneschke, Tristan A. "Static Frequency Converter for SEPTA's Wayne Junction Traction Substation." IEEE Transactions on Industry Applications IA-21, no. 2 (March 1985): 295–300. http://dx.doi.org/10.1109/tia.1985.349628.

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Kishore, G. Indira, and Ramesh Kumar Tripathi. "High Gain Single Switch DC-DC Converter Based on Switched Capacitor Cells." Journal of Circuits, Systems and Computers 29, no. 12 (February 26, 2020): 2050188. http://dx.doi.org/10.1142/s0218126620501881.

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With photovoltaic or fuel cell as a source, the high voltage required at DC bus as input for inverter can be obtained by high gain DC-DC converters. This can be achieved by implementing switched capacitor (SC) cells. Switched capacitors have the ability to produce high static gain and at the same time, they limit the voltage stress across the components. This paper proposes a high static gain, single switch DC converter based on the SC cells to develop high gain. These cells not only boost the voltage gain but also reduce the voltage stress at the active components. This converter also features a single active switch, low input ripple current through the inductor, absence of snubber circuit as the proposed converter does not assist the voltage spike across the active switch. The proposed converter allows high switching frequency and therefore results in a smaller size. The voltage gain can be increased further by adding the switched cells. In this paper, the operation in CCM, DCM, and design of components for the proposed converter is discussed. The MATLAB/SIMLINK and hardware-based studies for the proposed converters have been discussed to validate the specified features.
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Yuan, Zhan Jun, and Jin Wang. "Design of New Frequency Converter Based on TMS320LF2407A." Advanced Materials Research 466-467 (February 2012): 809–13. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.809.

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In order to improve voltage utilization ratio and dynamic performance of frequency converter, this paper presents a digital frequency converter design scheme based on digital signal processor TMS320LF2407A and the theory of space vector pulse width modulation (SVPWM) technology, provides its detailed design measures of software and hardware and SVPWM algorithm realization methods. The experimental results prove that this new frequency converter has simple structure, high control precision, higher voltage utilization ratio, better dynamic and static property.
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Fischer, J., E. Amirante, A. Bargagli-Stoffi, and D. Schmitt-Landsiedel. "Adiabatic circuits: converter for static CMOS signals." Advances in Radio Science 1 (May 5, 2003): 247–51. http://dx.doi.org/10.5194/ars-1-247-2003.

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Abstract. Ultra low power applications can take great advantages from adiabatic circuitry. In this technique a multiphase system is used which consists ideally of trapezoidal voltage signals. The input signals to be processed will often come from a function block realized in static CMOS. The static rectangular signals must be converted for the oscillating multiphase system of the adiabatic circuitry. This work shows how to convert the input signals to the proposed pulse form which is synchronized to the appropriate supply voltage. By means of adder structures designed for a 0.13µm technology in a 4-phase system there will be demonstrated, which additional circuits are necessary for the conversion. It must be taken into account whether the data arrive in parallel or serial form. Parallel data are all in one phase and therefore it is advantageous to use an adder structure with a proper input stage, e.g. a Carry Lookahead Adder (CLA). With a serial input stage it is possible to read and to process four signals during one cycle due to the adiabatic 4-phase system. Therefore input signals with a frequency four times higher than the adiabatic clock frequency can be used. This reduces the disadvantage of the slow clock period typical for adiabatic circuits. By means of an 8 bit Ripple Carry Adder (8 bit RCA) the serial reading will be introduced. If the word width is larger than 4 bits the word can be divided in 4 bit words which are processed in parallel. This is the most efficient way to minimize the number of input lines and pads. At the same time a high throughput is achieved.
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Makarov, V. A., F. A. Korolev, and R. E. Tyutyaev. "Sensors of Rapidly Changing Pressure Based on Jet Force." Proceedings of Higher Educational Institutions. Маchine Building, no. 1 (730) (January 2021): 34–40. http://dx.doi.org/10.18698/0536-1044-2021-1-34-40.

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Static and dynamic characteristics of rapid response pneumatic digital systems are determined with the help of pneumatic-galvanometric sensors that consist of pneumatic optical converters, electrical bridge circuits and magnetoelectric galvanometers. This paper presents theoretical and experimental studies of the pneumatic optical converter whose mode of operation is based on the jet force effect on a plate of limited dimensions commensurate with the dimensions of the contact area between the jet and the plate. The investigations are based on the equality of moments of the jet force and the counter-moment of the rod that the plate is fixed on. The sensitivity and other static characteristics of the converter (linearity, measurement rage) as well as other parameters necessary for interpreting the readings, calculating errors and calibrating the scale are determined. The natural frequency is sufficient to control dynamic processes controlled by pneumatic systems. For the design of converters, it is proposed to use the aggregate criterion of the quality factor that equals the product of the sensitivity and the natural frequency squared. The performed calculations are verified by experiments.
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Kuz’kin, V. I., V. N. Meleshkin, S. V. Myasishchev, and I. S. Khromov. "A static frequency converter in composition of high-speed rectifier drive." Russian Electrical Engineering 81, no. 7 (July 2010): 372–76. http://dx.doi.org/10.3103/s1068371210070060.

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Tatuyko, Pavel. "MODEL OF MANAGING PROCESSES OF ENGINEERING CHANGES IN PRODUCTS AT AN INDUSTRIAL ENTERPRISE." Automation and modeling in design and management, no. 1 (March 17, 2022): 73–79. http://dx.doi.org/10.30987/2658-6436-2022-1-73-79.

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The aim of the work is to determine promising converters for supplying consumer devices with the required voltage level. As part of the task implementation, a mathematical description of the resonant converter with a series LC resonant circuit is made. The equivalent replacement circuit of the converter is given, as a result of its analysis analytical expressions are determined that describe the main dependences of this converter on the load and switching frequency of the keys. In the process of analyzing the resonant converter operation with a series LC resonant circuit, mathematical modelling methods are used. The result of the work is the obtained analytical expressions that allow determining the oscillatory circuit parameters for the resonant converter operation with a series LC resonant circuit in the mode with the highest efficiency. The presented graphs demonstrate the key parameter dependence of the oscillatory circuit on the load magnitude and on the switching frequency of semiconductor keys, and, accordingly, on the oscillatory circuit frequency. Applying a resonant converter with a series LC resonant circuit is possible in those areas where a static load is used that changes little over time. Applying this converter is not optimal for a dynamic load, because to maintain the output voltage at the required level, it will be necessary to complicate the control system and introduce pulse-width modulation in addition to pulse-frequency one and to control the converter by means of skipping control pulses in the case when an operating mode is close to the idle one.
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Wang, De Shun, Bo Yang, and Lian Tao Ji. "Research and Develop on Static Frequency Converter of Pumped Storage Power Plant." Advanced Materials Research 608-609 (December 2012): 1120–26. http://dx.doi.org/10.4028/www.scientific.net/amr.608-609.1120.

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A static frequency converter start-up control strategy for pumped-storage power unit is presented. And rotor position detecting without position sensor is realized according to voltage and magnetism equations of ideal synchronous motor mathematics model. The mechanism and implementation method of initial rotor position determination and rotor position estimation under low frequency without position sensor are expounded and validated by simulations. Based on the mentioned control strategy, first set of a static frequency converter start-up device in China for large-scale pumped-storage unit is developed, which is applied to start-up control test in the 90 MW generator/motor of Panjiakou Pumped-storage Power Plant. Test results show that rotor position detecting, pulse commutation, natural commutation, and unit synchronous procedure control of static start-up are all proved. The outcomes have been applied in running equipment, which proves the feasibility of mentioned method.
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Dissertations / Theses on the topic "Static frequency converter"

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Rosado, Sebastian Pedro. "Analysis of Electric Disturbances from the Static Frequency Converter of a Pumped Storage Station." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/34448.

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The present work studies the disturbances created in the electric system of a pumped storage power plant, which is an hydraulic generation facility where the machines can work as turbines or pumps, by the operation of a static frequency converter (SFC). The SFC is used for starting the synchronous machines at the station when in the pump mode. During the starting process several equipment is connected to the SFC being possible to get affected by the disturbances generated. These disturbances mainly include the creation of transient overvoltages during the commutation of the semiconductor devices of the SFC and the introduction of harmonics in the network currents and voltages. This work analyzes the possible effects of the SFC operation over the station equipment based on computer simulations. For this purpose, the complete system was modeled and the starting process simulated in a computer transient simulator program. The work begins with a general review of the effects of electric disturbances over high voltage equipment and in particular of the disturbances generated by power electronics conversion equipment. Then the models for the different kind of equipment present in the system are discussed and formulated. The control system that governs the operation of the SFC during the starting process is analyzed later as well as the operation conditions. Once the model of the system is set up, the harmonic analysis of the electric network is done by frequency domain and time domain methods. Time domain methods are also employed for the analysis of the commutation transient produced by the SFC operation. Finally, the simulation results are used to evaluate the impact of the SFC operation on the station equipment, especially on the generator step up transformer.
Master of Science
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Esmaeilie, Ali. "Utvärdering av statiska frekvensomformare till spårledningar för Stockholm tunnelbana." Thesis, KTH, Hälsoinformatik och logistik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-259593.

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Tunnelbanan är ett mycket viktigt transportmedel i Stockholm som är igång större delen av dygnet. Tunnelbanans Röda och Blå linjer använder sig av ett äldre signalsystem från 60-talet. Det system som används för signaleringen av de två linjerna är av typen växelströmspårledning med kodning och använder reläställverk. Spårledningarna som detekterar positionen av olika tåg på spåret använder frekvensen 75 Hz. Vid konverteringen av frekvensen 50 Hz till 75 Hz, uppstår koldamm och värmeförluster till utrymmet från frekvensomformaren. Koldammet som avges i luften riskerar att påverka reläfunktionaliteten när det tränger in i relähöljet och sätter sig på ytan för reläkontakterna i utrymmet bredvid frekvensomformare. Trafikförvaltningen har planer på att upprusta Röda linjens signalsystem för att kunna använda dess signalsystem i ytterligare 25 år. Spårledningssystemet positionerar och ger hastighetsbesked till tågen. En litteraturstudie har genomförts kring uppbyggnad av spårledningssystemet och tidigare forskning har utförts kring frekvensomformare för att hitta en ny frekvensomformare som inte riskerar reläfunktionaliteten. Genom faktainsamling från Trafikförvaltningen har nya lämpliga frekvensomformare som kunde ersättas mot de befintliga undersökts. Statiska frekvensomformare har analyserats. Enligt kraven från Trafikförvaltningen identifierades fyra produkter från olika leverantörer. Ingen av de statiska frekvensomformare var direkt kompatibel med befintligt system med anledningen av att systemet är byggd för ett roterande frekvensomformare. ”HZ-50-1105” från GoHz denna modell finns i 1-fas in- respektive 1-fas utmatning. ”FR-D 700” från Mitsubishi och ”Micromaster 440” från Siemens som hade lika användnings funktion det gjorde att de var lik varandra. ”ACS-150” från ABB denna modell hade som max märkeffekt upp till 4 kVA, vilket passar bara för frekvensomformare med märkeffekt 2.5 kVA. De olika typerna av statiska frekvensomformare belastade nätet på ett asymmetriskt sätt. Därför var det viktigt att kunna fördela lasten så jämnt som möjligt på varje fas. Det var svårt att kunna rangordna de valda produkterna utan det bara visades vilka valmöjligheter som fanns vid utbytet av roterande frekvensomformare. Användningen av statiska frekvensomformare eliminera de risker som en roterande frekvensomformare orsakar. Statiska frekvensomvandlare generera olika frekvenser med större noggrannhet samt de har en kortare driftsättnings tid men belastar de nätet asymmetriskt jämfört med roterande frekvensomformare.
The subway is a very important means of transport in Stockholm and is in operation most of the day. The Red and Blue lines of the metro use an older signal system from the 60s. The system used for the signaling of the two lines is of the type AC power line with coding and uses relay switches. The track circuit that detects the position of different trains on the track use the frequency 75 Hz. When converting the frequency 50 Hz to 75 Hz, carbon dust and heat losses is released to the space from the frequency converter. The carbon dust emitted into the air risks affecting relay functionality as it enters the relay housing and settles on the surface of the relay contacts in the space next to the frequency converter. The Traffic Administration have plans to upgrade the Red Line's signaling system in order to use the existing signaling system for another 25 years. The track circuit system positions and gives speed messages to the trains. A literature study has been conducted on the construction of the track circuit system and previous research has been conducted on frequency inverters to safely find a new frequency inverter that does not risk relay functionality. Through fact-finding from the Traffic Administration, new suitable frequency converters that could be replaced with the existing ones were investigated in this research. Static frequency converters were chosen to be investigated. According to the requirements of the Traffic Administration, four products were identified from different suppliers. None of the static frequency converters was directly compatible with existing systems because the system was built for a rotary frequency converter. "HZ- 50-1105" from GoHz this model is available in 1-phase input and 1-phase output respectively. "FR-D 700" from Mitsubishi and "Micromaster 440" from Siemens which were equal in and out connection. "ACS-150" from ABB this model had a maximum rated power up to 4 kVA, which is only suitable for frequency inverters with a rated power of 2.5 kVA. The various types of static frequency inverters loaded the network in an asymmetrical way. Therefore, it was important to be able to distribute the load as evenly as possible on each phase. It was difficult to be able to rank the selected products without just showing the choices that existed when replacing rotary frequency converters. However, the use of static frequency inverters eliminates the risks of a rotating frequency converter. Static frequency converters can more accurately generate different frequencies and they have a shorter commissioning time; however, they load the network asymmetrically compared to rotating frequency converters.
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Perin, Igor. "Techno-economical optimisation of 50kV AC railway networks." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/204187/1/Igor_Perin_Thesis.pdf.

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Recent advances in power converter and energy storage technologies have the potential to enhance the power quality management, improve the utilization, and, consequently, reduce both capital and operational costs associated with electric railway networks. This thesis examines the new technologies and new uses of existing technologies and their suitability for integration into the AC traction power network. It includes a comprehensive comparison of the potential technical and commercial benefits of various technologies and topologies. The study is generally applicable to 25 kV or 50 kV electric railways fed from a utility grid with commercial models similar to the one described.
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Blanc-Russac, Jean-Marie. "Conversion statique de frequence par le moyen de dispositifs magnetiques." Paris 6, 1987. http://www.theses.fr/1987PA066270.

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Etude de la ferroresonance en regime de saturation en vue de l'obtension d'un spectre harmonique riche. Application aux circuits d'allumage pour lampes a decharge. Realisation de circuits selecteurs d'harmonique
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Tran, Le Nhat Hoang. "Modélisation fréquentielle analytique de convertisseurs statiques en vue du dimensionnement de systèmes par optimisation." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT122/document.

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Dans le cadre du dimensionnement des systèmes de conversion statique d’énergie implantés dans des réseaux électriques, il est important de respecter certaines normes harmoniques. Pour caractériser celles-ci, on doit utiliser des approches des modélisations fréquentielles : soit numérique, soit semi-analytique. La deuxième est préférable pour à une procédure de dimensionnement par optimisation de système, qui requiert un modèle rapide et peut accepter beaucoup de contraintes. Cependant, la difficulté principale apparaît lors de la modélisation analytique des structures d’électronique de puissance, notamment celles ayant de la commutation naturelle.Cette thèse propose une approche de modélisation semi-analytique où la résolution des équations implicites est faite par Newton-Raphson ou SQP. Cependant, cette approche pose des difficultés de convergence de la méthode utilisée du point de vue numérique et du point de vue du mode de fonctionnement du convertisseur statique. Ainsi, cette thèse propose différentes alternatives pour les résoudre.En terme d’illustrations, cette thèse s’appuie particulièrement sur des applications avec des redresseurs à diodes qui sont largement utilisés dans les sous-stations de réseaux ferroviaires ou dans les réseaux d’avion,Notamment, un canal de puissance typique d’un Airbus de « nouvelle génération » sert d’application du point de vue de dimensionnement par optimisation
For the design of static energy conversion systems from power grids, harmonic standards have to berespected. To characterize them, frequency modeling approaches, either numerical or semi-analytical. Thesecond one is more advisable for the sizing by optimization of systems, where a fast model is required and manyconstraints have to be carried out. However, the main difficulties happen in the analytical modeling of powerelectronics structures, especially those with soft commutations.This thesis proposes a semi-analytical modeling approach where the solving of implicit equations iscarried out by Newton-Raphson or SQP. The convergence difficulties are analyzed in two viewpoints:numerically and according the operating mode of the static converters. Then, alternatives are proposed to solvethem.To illustrate the problematic, applications with diode rectifiers (widely used in railway electrical gridsubstations or airline electrical grid) are used. Especially, the sizing of power channel of « new generation» of anAirbus, is made by optimization, using the proposed modelling approach
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Dufernez, Bruno. "Étude et simulation numérique d'un cycloconvertisseur à commande entièrement numérique." Vandoeuvre-les-Nancy, INPL, 1992. http://www.theses.fr/1992INPL133N.

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Le travail présenté dans cette thèse a été réalisé au sein du groupe de recherches en électrotechnique et électronique de Nancy, en collaboration avec le centre de recherche en automatique de Nancy. Il s'agit d'une étude sur les cycloconvertisseurs et plus particulièrement sur la réalisation de la commande d'un cycloconvertisseur triphasé à 36 thyristors, entièrement numérique, sans courant de circulation et sans liaison de neutre. Cette commande numérique est basée sur un générateur d'impulsions de type allumeur à retard. L'étude a été réalisée principalement par simulation numérique. Le programme de simulation a été réalisé avec GASPE (générateur automatique de programme de simulation des procédés électromécaniques), en utilisant une méthode de modélisation permettant de prendre en compte toutes les topologies du convertisseur, en particulier les commutations avec empiétement. La comparaison entre les différentes stratégies de commande s'appuie sur l'observation des formes d'ondes et des taux d'harmoniques. L'ébauche d'une réalisation pratique d'un cycloconvertisseur monophasé, sans courant de circulation et entièrement numérique est aussi présentée
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David, Alain. "Insensibilisation des convertisseurs de fréquence aux creux et coupures de tension." Cachan, Ecole normale supérieure, 1993. http://www.theses.fr/1993DENS0009.

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Les convertisseurs de fréquence pour machine asynchrone sont en fort développement depuis une dizaine d'années. Cette structure s'avère cependant très sensible aux creux et coupures brèves de tension du réseau d'alimentation. Ces perturbations peuvent occasionner une perte de contrôle du convertisseur, entrainant, le plus souvent, un arrêt total du système, avec un redémarrage rarement automatique de l'équipement au retour de l'alimentation. Ces arrêts impromptus sont problématiques et couteux pour beaucoup d'applications industrielles. De nouvelles stratégies de commande du convertisseur pour palier à ce problème sont proposées dans cette thèse. Un modèle de l'ensemble convertisseur de fréquence-machine asynchrone est développé en régime transitoire en supposant une tension d'alimentation quelconque. Les effets des perturbations réseau sur le système sont ensuite étudies. Plusieurs techniques d'insensibilisation sont ensuite proposées: a) une régulation du système pour compenser les effets des creux de tension, b) une identification de la vitesse de la machine en roue libre (nécessaire pour un rattrapage au vol après une coupure brève triphasée), c) une technique de rattrapage au vol basée sur une synchronisation du convertisseur sur les tensions résiduelles générées par le flux rémanent de la machine, d) une régulation a glissement nul assurant le maintien du synchronisme entre le convertisseur et la machine lors de coupures brèves triphasées. Ces techniques ont été validées sur simulations numériques et sur un banc d'essais de 7. 5 kw, avec des performances satisfaisantes: contrôle permanent du système, minimisation des chutes de vitesse, redémarrage automatique du système au retour de la tension normale sans surcourant ou à-coup de couple. L'ensemble des résultats et les performances des commandes sont étudies d'un point de vue théorique sur la base du modèle développé
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Li, Jian Ming. "Evaluation des possibilités fréquentielles des transistors bipolaires de puissance haute tension." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0049.

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Cette étude vise les possibilités d'utilisation des T. B. P. H. T. Dans les convertisseurs à résonance à des fréquences de quelques centaines de kHz et des puissances de quelques dizaines de kw. Pour atteindre cet objectif, une modélisation analytique uni-dimensionnelle du semi-conducteur est proposée: elle permet d'obtenir les caractéristiques de la commande de base aux fréquences correspondantes et d'analyser les performances fréquentielles des circuits de base aux fréquences correspondantes et d'analyser les performances fréquentielles des circuits de base classiques. Les synthèses de commande et les interrupteurs du type “CASCODE” sont représentés. Deux convertisseurs à résonance réalisés, un onduleur de tension 200 kHz-10 kW et un onduleur de courant 100 kHz-20 kW montrent la faisabilité de l'objectif en optimisant la commande des T. B. P. H. T
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Lin, Jyh-Ian, and 林志映. "The Study of a Static Frequency Converter for Starting a Large Synchronous Machine." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/60886961504378965316.

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Books on the topic "Static frequency converter"

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K, Sood Pradeep, and Lewis Research Center, eds. Study of the generator/motor operation of induction machines in a high frequency link space power system. Madison, Wis: University of Wisconsin, [Dept. of Electrical and Computer Engineering, 1987.

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Clark, Elizabeth A. Melania the Younger. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190888220.001.0001.

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Melania the Younger: From Rome to Jerusalem analyzes one of the most richly detailed stories of a woman of late antiquity. Melania, an early fifth-century Roman Christian aristocrat, renounced her many possessions and staggering wealth to lead a life of ascetic renunciation. Hers is a tale of “riches to rags.” Born to high Roman aristocracy in the late fourth century, Melania encountered numerous difficulties posed by family members, Roman officials, and historical circumstances themselves in disposing of her wealth, property spread across at least eight Roman provinces, and thousands of slaves. Leaving Rome with her entourage a few years before Gothic sack of Rome in 410, she journeyed to Sicily, then to North Africa (where she had estates upon which she founded monasteries), before settling in Jerusalem. There, after some years of semi-solitary existence, she founded more monastic complexes. Toward the end of her life, she traveled to Constantinople in an attempt to convert to Christianity her still-pagan uncle, who was on a state mission to the eastern Roman court. Throughout her life, she frequently met and assisted emperors and empresses, bishops, and other high dignitaries. Embracing an extreme asceticism, Melania died in Jerusalem in 439. Her Life, two versions of which (Greek and Latin) were discovered in the late nineteenth and early twentieth centuries, was composed by a longtime assistant who succeeded her in directing the male and female monasteries in Jerusalem. An English translation of the Greek version of her Life accompanies the text of this book.
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Book chapters on the topic "Static frequency converter"

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Baskys, A., R. Rinkevičienė, S. Jegorov, and Andrius Petrovas. "Modeling of a Mechatronic System with the AC Induction Motor Supplied by the Frequency Converter." In Solid State Phenomena, 19–24. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908451-21-3.19.

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Dubé, B., and A. Pérocheau. "DIGITAL SIMULATION OF A VERTICAL AXIS WIND TURBINE GENERATOR WITH A STATIC FREQUENCY CONVERTER." In Intersol Eighty Five, 2072–76. Elsevier, 1986. http://dx.doi.org/10.1016/b978-0-08-033177-5.50389-6.

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Khan, Laiq, and Rabiah Badar. "Hybrid Adaptive NeuroFuzzy Bspline Based SSSC Damping Control Paradigm." In Handbook of Research on Novel Soft Computing Intelligent Algorithms, 787–828. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-4450-2.ch026.

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This work explores the potential of Bspline based Adaptive NeuroFuzzy Wavelet control to damp low frequency power system oscillations using Static Synchronous Series Compensator (SSSC). A comparison of direct and indirect adaptive control based on Hybrid Adaptive Bspline Wavelet Control (ABSWC) is presented by introducing the online identification block. ABSWC with Identification (ABSWCI) provides the sensitivity information of the plant to control system. The parameters of the control and identification block are updated online using gradient descent based back propagation algorithm. The robustness of the proposed control algorithm has been evaluated for local and inter-area modes of oscillations using different faults. The nonlinear time domain simulation results have been analyzed on the basis of different performance indices and time-frequency representation showing that ABSWC effectively damps low frequency oscillations and incorporation of online identification optimizes the control system performance in terms of control effort which reduces the switching losses of the converter.
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Brock, Fred V., and Scott J. Richardson. "Sampling and Analog-to-Digital Conversion." In Meteorological Measurement Systems. Oxford University Press, 2001. http://dx.doi.org/10.1093/oso/9780195134513.003.0015.

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Along the signal path from the atmosphere, through the sensors and the data logger to the final archive, the signal quality may be irreversibly comprised. These faults include aliasing caused by poor sampling practice and quantization in an analog to- digital converter. Aliasing and quantization will be defined in this chapter. Drift in some of the system parameters, such as temperature sensitivity, is generally preventable but is not always reversible. Sampling of a signal occurs in the time domain and, frequently, in the space domain with one, two, or three dimensions. In the time domain, the time interval between successive points is called the sampling interval and the data logger controls this interval. When two or more sensors are distributed, vertically, along a mast then the system is sampling both in the time domain and in the space domain. When multiple measurements are arrayed along the surface of the earth, the sampling is occurring in time and in two or three space dimensions. Most meteorological systems are undersampled both in time and space. Space undersampling is an economic necessity. The consequence of undersampling is that frequencies above a certain limit, called the Nyquist frequency, will appear at lower frequencies and this is an irreversible effect. Quantization occurs when the signal is converted from analog to digital in the analog-to-digital converter. Since the range of the converter is expressed in a finite number of digital states, signal amplitudes smaller than this quantity will be lost. This is another irreversible effect. These are not the only irreversible effects. For example, drift is caused by physical changes in a sensor or other component of the measurement system. Drift may have a causal component, such as undocumented temperature sensitivity, and a random component such as wearing of an anemometer bearing. The former is theoretically preventable and reversible, whereas the latter is irreversible. Each element of the system may include some signal averaging, and each element may add bias and gain. As noted in earlier chapters, a sensor is a transducer, a device that changes energy from one form to another.
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"Induction Heating Power Supplies." In Elements of Induction Heating, 47–75. ASM International, 1988. http://dx.doi.org/10.31399/asm.tb.eihdca.t65220047.

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Abstract Besides the induction coil and workpiece, the induction generator (source of ac power) is probably the most important component of an overall induction heating system. Such equipment is typically rated in terms of its frequency and maximum output power (in kilowatts). This chapter addresses the selection of power supplies in terms of these two factors as well as the operational features of different types of sources. The six different types of power supplies for induction heating applications covered in this chapter are line-frequency supplies, frequency multipliers, motor-generators, solid-state (static) inverters, spark-gap converters, and radio-frequency power supplies. The chapter discusses the design and characteristics of each of the various types of power supplies.
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Musuroi, Sorin. "The Behavior in Stationary Regime of an Induction Motor Powered by Static Frequency Converters." In Induction Motors - Modelling and Control. InTech, 2012. http://dx.doi.org/10.5772/38009.

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Yu, Tao. "Passive Detection Method Based on Phase-frequency Conversion." In Passive Location Method Based on Phase Difference Measurement, 196–215. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815079425122010009.

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On the basis of the existing research, the passive detection method based on Doppler shift is further converted to the passive detection method based on the non-fuzzy phase difference measurement. Based on the phase-frequency conversion, the passive detection methods of two different models, that is a method of detecting a fixed target by a moving station, are presented in this chapter for improving the ranging accuracy. The first one studies the single station passive ranging method which takes the motion trajectory as the baseline of the detection array. The second one studies the ranging method which transforms the single base array into the virtual double base array by the relation between frequency shift and path difference. The research in this chapter provides some reference information on how to improve the performance of single or dual station passive positioning. This chapter proves that the accuracy of the phase difference ranging is better than that of the Doppler frequency difference. The significance of phase-frequency conversion lies in the first use of Doppler positioning method to give the location method which is difficult to obtain by using the phase difference equation, and then through phase-frequency conversion, further obtain better measurement accuracy than Doppler frequency difference measurement.
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"Indirect Power Control (IDPC) of DFIG Using Classical & Adaptive Controllers Under MPPT Strategy." In Improved Indirect Power Control (IDPC) of Wind Energy Conversion Systems (WECS), edited by Fayssal Amrane and Azeddine Chaiba, 26–85. BENTHAM SCIENCE PUBLISHERS, 2019. http://dx.doi.org/10.2174/9789811412677119010005.

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In this chapter, we present a comparative study of conventional Indirect Power Control (IDPC) algorithm of DFIG-Wind turbine in grid-connection mode, using PI and PID controllers via Maximum power point tracking (MPPT) strategy. Firstly, the conventional IDPC based on PI controllers will be described using simplified model of DFIG through stator flux orientation and wind-turbine model. The MPPT strategy is developed using Matlab/Simulink® with two wind speed profiles in order to ensure the robustness of wind-system by maintaining the Power coefficient (Cp) at maximum value and reactive power at zero level; regardless unexpectedF wind speed variation. Secondly, the rotor side converter (RSC) and Grid side converter (GSC) are illustrated and developed using Space vector modulation (SVM) in order to minimize the stress and the harmonics and to have a fixed switching frequency. In this context, the switching frequency generated by IDPC to control the six IGBTs of the inverter (RSC), and this control algorithm works under both Sub- and Supersynchronous operation modes and depending to the wind speed profiles. The quadrants operation modes of the DFIG are described in details using real DFIG to show the power flow under both modes (motor and generator in the four (04) quadrants. Finally, the conventional IDPC have several drawbacks as: response time, power error and overshoot. In this context, the PID and MRAC (adaptive regulator) controllers are proposed instead of the PI to improve the wind-system performances via MPPT strategy with/without robustness tests. The obtained simulation results under Matlab/Simulink® show high performances (in terms of power error, power tracking and response time) in steady and transient states despite sudden wind speed variation, whereas big power error and remarkable overshoot are noted using robustness tests, so the proposed IDPC can not offer big improvement under parameter variation.
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Zhu, Zhubing, Yongfeng Cheng, Zhicheng Lu, Zhenlin Liu, Haibo Wang, Yaodong Xue, and Sen Lin. "Current Status and Prospect of Seismic Research on Transformer Electrical Equipment." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220994.

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Earthquakes occur frequently in China. Earthquake damage data show that transformer equipment, as the core of substations (converter stations), has a high vulnerability under the seismic effect. Based on the structural features of transformer equipment, this paper discusses the current status of earthquake damage investigation and research in China and other countries, summarizes the earthquake damage modes and reasons for transformer equipment, introduces the progress of seismic research for transformer equipment in China and other countries, analyzes the role of existing technology in promoting the development of seismic technology for transformer equipment, and provides an outlook for the further research.
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Fosi, Irene. "Mobility and Danger on the Borders of the Papal States (Sixteenth- Seventeenth Centuries)." In Connected Mobilities in the Early Modern World. Nieuwe Prinsengracht 89 1018 VR Amsterdam Nederland: Amsterdam University Press, 2022. http://dx.doi.org/10.5117/9789463729239_ch04.

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This chapter examines the Inquisition’s attempts to control the movement of students and merchants within the Papal States. The Roman Inquisition attempted to monitor the movements of ‘heretical’ foreign students, merchants, artisans, artists, and diplomats. Yet such figures moved frequently and as such were not easy to control, convert, or expel. In many cases, local authorities tried to apply the rigorous guidelines defined by pontifical law, although these were difficult to apply in practice. Inquisitors and their agents in the Papal States were frequently unable to act decisively or coherently. The rich documentation allows us to observe the daily activities of people directly involved in controlling movement.
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Conference papers on the topic "Static frequency converter"

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Rohten, Jaime, Jose Espinoza, Felipe Villarroel, Marcelo Perez, Javier Munoz, Pedro Melin, and Eduardo Espinosa. "Static power converter synchronization and control under varying frequency conditions." In IECON 2012 - 38th Annual Conference of IEEE Industrial Electronics. IEEE, 2012. http://dx.doi.org/10.1109/iecon.2012.6388651.

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Ryu, Ho-seon, Bong-suck Kim, Joo-hyun Lee, and Ik-hun Lim. "A Study of Synchronous Motor Drive using Static Frequency Converter." In 2006 12th International Power Electronics and Motion Control Conference. IEEE, 2006. http://dx.doi.org/10.1109/epepemc.2006.283401.

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Ho-Seon Ryu, Bong-Suck Kim, Joo-Hyun Lee, and Ik-Hun Lim. "A Study of Synchronous Motor Drive using Static Frequency Converter." In 2006 12th International Power Electronics and Motion Control Conference. IEEE, 2006. http://dx.doi.org/10.1109/epepemc.2006.4778615.

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Alexa, Dimitrie, Irinel Valentin Pletea, Alexandru Lazar, and Tecla Castelia Goras. "Static frequency converter with PWM self - Control inverter for an induction motor." In 2015 International Symposium on Signals, Circuits and Systems (ISSCS). IEEE, 2015. http://dx.doi.org/10.1109/isscs.2015.7203956.

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Perin, Igor, and Geoffrey R. Walker. "Protection of a Static Frequency Converter fed traction network, a case study." In 2015 Australasian Universities Power Engineering Conference (AUPEC). IEEE, 2015. http://dx.doi.org/10.1109/aupec.2015.7324788.

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Zheng, Tao, Xue Jiang, and Shuo Yu. "The simulation of the static frequency converter in pumped storage power plant." In 2015 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT). IEEE, 2015. http://dx.doi.org/10.1109/drpt.2015.7432249.

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Yu-zhi, Zhang. "Study of starting process of pumped storage machines by static frequency converter." In 2010 2nd International Conference on Signal Processing Systems (ICSPS). IEEE, 2010. http://dx.doi.org/10.1109/icsps.2010.5555578.

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Jian Xie, A. Zynovchenko, Feng Li, H. J. Haubrich, and P. Treige. "Converter control and stability of the 110-kV railway grid increasing use of the static frequency converters." In 2005 IEEE 11th European Conference on Power Electronics and Applications. IEEE, 2005. http://dx.doi.org/10.1109/epe.2005.219259.

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Tanta, Mohamed, Luis A. M. Barros, J. G. Pinto, Antonio P. Martins, and Joao L. Afonso. "Modular Multilevel Converter in Electrified Railway Systems: Applications of Rail Static Frequency Converters and Rail Power Conditioners." In 2020 International Young Engineers Forum (YEF-ECE). IEEE, 2020. http://dx.doi.org/10.1109/yef-ece49388.2020.9171814.

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Jaekel, Bernd W. "Low-frequency electromagnetic environment in high-voltage converter and static VAR compensator stations." In 2005 IEEE Russia Power Tech. IEEE, 2005. http://dx.doi.org/10.1109/ptc.2005.4524521.

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Reports on the topic "Static frequency converter"

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Leitherer, Art. Solid State Frequency Converters,. Fort Belvoir, VA: Defense Technical Information Center, July 1995. http://dx.doi.org/10.21236/ada302025.

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Leis, Sherry, and Mary Short. George Washington Carver National Monument plant community report: 2004–2020. Edited by Tani Hubbard. National Park Service, December 2021. http://dx.doi.org/10.36967/nrr-2288500.

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The Heartland Inventory and Monitoring Network completed its sixth year of plant community monitoring at George Washington Carver National Monument in 2020. Plant community monitoring focused on the restored prairie community. We visited seven monitoring sites in each of the six years and collected data on plant species and ground cover. In this report we also included two environmental factors—precipitation and recent fire history—to better understand the vegetation community status and trends. Since 2000, precipitation has often been below the 30-year normal. Moreover, annual precipitation was below normal for all but one of the monitoring years. We found that the drought in 2012 stood out as possibly influencing plant guild cover. Although prairies are adapted to drought, further analyses might reveal more about the role of climate change in these vegetation communities. Fire management also plays an important role in shaping plant communities. Prescribed fire occurrence became more frequent and consistent through the period of plant monitoring. Additional treatments, including herbicide and mowing, also supported a healthy prairie. The prairie plant community continues to be moderately diverse despite recent increases in tree seedlings and small saplings. Species richness in 2012 was different than in two of the six years monitored. However, diversity indices (H′ and J′) were very similar across monitored years. Species guilds (also known as functional groups) exhibited differing patterns. Woody plants, long a concern at the monument, were statistically similar across years. In 2020, grass-like species increased, but grass species appeared to have declined below prior years. Grass cover in 2004 was statistically different (greater) than in 2008 and 2020. The reasons for this are not clear. Of particular interest to the park is the status of two sumac species (Rhus glabra and R. copallinum). These species were in decline as a result of focused management actions since 2012. However, the blackberry species (Rubus spp.) seemed to be replacing the sumac in some sites. In 2020, nonnative species richness and cover were below peak levels, demonstrating management actions have been successful in maintaining low levels. The vegetation monitoring protocol experienced some changes between 2004 and 2020. A key difference was a shift from sampling twice during the field season to sampling only once in a monitoring year. Although a decline in species richness was anticipated, that pattern was not apparent. However, the abundance of grasses may have been affected by the shift in seasonality of sampling. Additionally, we remedied inconsistencies in how tree regeneration was recorded (stem tallies in some cases and cover estimates in other cases). We converted all cover data to stem tallies and density was calculated to be consistent with the protocol. The monument has had success with coordinating fire management and invasive species management. A decrease in sumac across the prairie is evidence of this success. These actions will continue to be important for maintaining the prairie in good condition into the future.
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