Дисертації з теми "Current voltage and power voltage characteristics"
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Svrček, Milan. "Metody pro dosažení maximálního výkonu FV modulů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-318171.
Повний текст джерелаGhasemi, Negareh. "Improving ultrasound excitation systems using a flexible power supply with adjustable voltage and frequency to drive piezoelectric transducers." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/61091/1/Negareh_Ghasemi_Thesis.pdf.
Повний текст джерелаШевченко, Сергій Юрійович. "Вплив вищих гармонік напруги на вибір та експлуатацію обмежувачів перенапруг для захисту систем електропостачання". Thesis, НТУ "ХПІ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/18478.
Повний текст джерелаThe thesis for the degree of doctor of technical sciences, specialty 05.09.03 - Electrotechnical complexes and systems. - National Technical University "Kharkiv Polytechnic Institute". Kharkov 2015. Dissertation is devoted to actual scientific and technical problem of determining the effect of the higher harmonics of the voltage on the selection and exploitation of surge arresters for protection electricity supply systems is important and enhances the efficiency and reliability of power supply systems. In this area, the following results. The analysis of existing requirements for the selection and exploitation of surge arresters in electricity supply systems of different voltage classes. Experimental studies of electrophysical characteristics of varistors and surge arresters assembled the world's leading manufacturers in the different frequencies of the applied voltage and current voltage characteristics of varistors and surge arresters in an assembled state in the area of leakage current. Іmproved the mathematical model for selecting the energy characteristics of the arrester at a low power quality in the power supply system on the basis of equivalent circuits in the area of the arrester leakage current of the current-voltage characteristics (CVC). Offered the method for determination of active power losses in the arrester on the basis of the obtained current-voltage characteristics in the area of leakage current and the analysis of the impact of non-sinusoidal voltage to the amount of energy exerted on surge arresters, as well as determined the effect of the normal operation of surge arresters Surge lightning and switching current pulses and high frequency voltage. Developed the methods for determining the current-voltage characteristics in the area of the arrester leakage current on the basis of the experimental CVC arresters based on neural networks and approximation CVC two curves of the first order. Іmproved the mathematical model of thermal modes of surge arresters in low power quality in the power supply system and to study the effect of different factors on the thermal stability of the arrester. Experimentally investigated for poor quality of electricity supply systems of various types of industry of Ukraine; An improved method for selecting surge arresters in power supply systems of different rated voltages with low quality electric energy. Іmproved the basic principles for the use and operation of surge arresters under the influence of higher harmonic voltage. Justify the use of thermal imagers and pyrometers for operational monitoring of the arrester.
Шевченко, Сергій Юрійович. "Вплив вищих гармонік напруги на вибір та експлуатацію обмежувачів перенапруг для захисту систем електропостачання". Thesis, НТУ "ХПІ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/18479.
Повний текст джерелаThe thesis for the degree of doctor of technical sciences, specialty 05.09.03 - Electrotechnical complexes and systems. - National Technical University "Kharkiv Polytechnic Institute". Kharkov 2015. Dissertation is devoted to actual scientific and technical problem of determining the effect of the higher harmonics of the voltage on the selection and exploitation of surge arresters for protection electricity supply systems is important and enhances the efficiency and reliability of power supply systems. In this area, the following results. The analysis of existing requirements for the selection and exploitation of surge arresters in electricity supply systems of different voltage classes. Experimental studies of electrophysical characteristics of varistors and surge arresters assembled the world's leading manufacturers in the different frequencies of the applied voltage and current voltage characteristics of varistors and surge arresters in an assembled state in the area of leakage current. Іmproved the mathematical model for selecting the energy characteristics of the arrester at a low power quality in the power supply system on the basis of equivalent circuits in the area of the arrester leakage current of the current-voltage characteristics (CVC). Offered the method for determination of active power losses in the arrester on the basis of the obtained current-voltage characteristics in the area of leakage current and the analysis of the impact of non-sinusoidal voltage to the amount of energy exerted on surge arresters, as well as determined the effect of the normal operation of surge arresters Surge lightning and switching current pulses and high frequency voltage. Developed the methods for determining the current-voltage characteristics in the area of the arrester leakage current on the basis of the experimental CVC arresters based on neural networks and approximation CVC two curves of the first order. Іmproved the mathematical model of thermal modes of surge arresters in low power quality in the power supply system and to study the effect of different factors on the thermal stability of the arrester. Experimentally investigated for poor quality of electricity supply systems of various types of industry of Ukraine; An improved method for selecting surge arresters in power supply systems of different rated voltages with low quality electric energy. Іmproved the basic principles for the use and operation of surge arresters under the influence of higher harmonic voltage. Justify the use of thermal imagers and pyrometers for operational monitoring of the arrester.
Massi, Pavan Alessandro. "A hardware field simulator for photovoltaic materials applications." Doctoral thesis, Università degli studi di Trieste, 2008. http://hdl.handle.net/10077/2757.
Повний текст джерелаIl presente lavoro riguarda la descrizione di un simulatore di campo fotovoltaico (in seguito simulatore). Il simulatore è un convertitore elettronico di potenza che, alimentato dalla rete elettrica, riproduce la caratteristica tensione corrente di un campo fotovoltaico (insieme di moduli fotovoltaici connessi in serie e in parallelo) operante in condizioni climatiche di temperatura e irraggiamento arbitrarie. Il nuovo dispositivo verrà impiegato nell’ambito del laboratorio fotovoltaico cui fa riferimento l’impianto in via di realizzazione sul tetto dell’edificio che ospita il Dipartimento dei Materiali e delle Risorse Naturali dell’Università di Trieste. Il simulatore viene proposto come utile strumento per i progettisti di dispositivi solari funzionanti in sistemi fotovoltaici connessi in rete. In particolare, il simulatore permetterà di prevedere il funzionamento di nuovi moduli fotovoltaici operanti in condizioni di ombreggiamento arbitrario e inseriti in un sistema fotovoltaico reale. L’uso del simulatore sarà particolarmente efficace nel caso di simulazioni di tecnologie in film sottile come, ad esempio, il silicio amorfo, il tellururo di cadmio, ecc. Il simulatore sarà anche necessario per testare i componenti che fanno parte di un sistema fotovoltaico connesso in rete, con particolare riferimento ai sistemi di condizionamento della potenza (detti anche inverter). Tali sistemi, oltre a convertire la tensione continua prodotta dai moduli fotovoltaici in una tensione compatibile e sincronizzata con quella della rete, devono garantire istante per istante l’inseguimento del punto di massima potenza estraibile dal campo fotovoltaico cui sono connessi. Il lavoro è stato suddiviso in cinque capitoli. Il primo capitolo fornisce una breve descrizione dello stato dell’arte e di alcune aspetti economici relativi alla tecnologia fotovoltaica. Nel secondo capitolo vengono richiamati il modello classico di una cella solare e le definizioni riguardo le sue caratteristiche principali (punto di massima potenza, efficienza, fill factor, ecc.). Nello stesso capitolo un’overview sui materiali e sulle tecnologie utilizzate nella realizzazione dei dispositivi fotovoltaici divide, come suggerito da Martin Green, le celle solari in tre diverse generazioni: la prima comprende i dispositivi realizzati in silicio cristallino (mono e policrisallino), la seconda quelli in film sottile (in silicio amorfo, tellururo di cadmio CdTe, diseleniuro di rame e indio CIS, diseleniuro di rame, indio e gallio CIGS, diseleniuro di rame, indio, gallio e zolfo CIGSS) e le celle di Graetzel, e la terza le celle multigiunzione, a banda intermedia e quelle organiche. Nel capitolo tre viene fornita una descrizione dei componenti costituenti un sistema fotovoltaico connesso in rete e viene proposto un nuovo metodo per la determinazione delle caratteristiche corrente tensione e potenza tensione prodotte da dispositivi fotovoltaici. Il metodo risulta efficace in quanto non necessita di misure sperimentali da effetture sui diversi dispositivi. I dati forniti nei comuni data sheet che vengono forniti a corredo dei moduli fotovoltaici sono sufficienti a determinarne il comportamento al variare della temperatura di funzionamento e del livello di radiazione solare. L’efficienza di un sistema fotovoltaico (Balance Of the System, BOS) viene calcolata nel capitolo quattro. Particolare enfasi viene data all’effetto di mismatching che è tanto più importante quanto più è elevato il livello di ombreggiamento presente sul piano dei moduli fotovoltaici costituenti l’impianto. Infine, l’ultimo capitolo riguarda la descrizione del simulatore e delle sue applicazioni.
The subject of this work is a power electronic device, hereafter named photovoltaic field simulator, which converts the grid voltage into a current voltage characteristic. This characteristic replicates the behavior of a real photovoltaic field working in arbitrary conditions of irradiance and temperature. After building, the photovoltaic field simulator will be used in the photovoltaic laboratory which is connected to the experimental photovoltaic plant which will be installed on the roof top of the Materials and Natural Resources Department of Trieste University. The photovoltaic field simulator will be used for photovoltaic module parameters design with particular reference to its behavior when inserted in a photovoltaic field operating under shaded conditions. The use of the simulator will be particularly effective when simulating thin-film technologies as, for example, amorphous silicon, cadmium telluride, and etc. The photovoltaic field simulator will also be used for testing the components of grid connected photovoltaic systems with particular reference to the power conditioning units (also named inverters). These systems, which convert the direct current produced by the photovoltaic modules into a utility grade current (typically alternate and sinusoidal at a frequency of 50-60Hz), must extract maximum power from the photovoltaic field. The work is divided into five chapters. In the first a brief description of photovoltaic technology and its economic aspects is given. Chapter two is on classic solar cell modelling basics and on the definition of the parameters of photovoltaic technology (maximum power point, efficiency, fill factor, and etc.). In the same chapter a materials and technologies overview splits, as suggested by Martin Green, solar cells in three different generations: the first comprises crystalline silicon (mono and polycrystalline) devices, the second thin-film devices (amorphous silicon, cadmium telluride CdTe, copper indium diselenide CIS, copper indium gallium diselenide CIGS, copper indium gallium sulphur diselenide CIGSS), and the Graetzel cells, while the third multi-junction, intermediate band and organic photovoltaic devices. The third chapter briefly describes photovoltaic grid connected system components. In particular a new model for plotting photovoltaic current voltage and power voltage characteristics is provided. The method is original because only module data sheet parameters are used and experimental measurements are not needed in order to determine the photovoltaic modules behavior with reference to irradiance and working temperatures changes. In chapter four the Balance of a photovoltaic System (BOS) is calculated. In particular the importance of the mismatching effect of photovoltaic modules due to shaded conditions is shown. The last chapter is on simulator description and its applications.
XX Ciclo
1975
Hölling, Matthias. "Adaptive current and voltage measurement device for low voltage distribution in power nets /." [S.l.] : [s.n.], 2000. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13985.
Повний текст джерелаRen, Huilin. "Current Voltage Characteristics of a Semiconductor Metal Oxide Sensor." Fogler Library, University of Maine, 2001. http://www.library.umaine.edu/theses/pdf/RenH2001.pdf.
Повний текст джерелаMcClusky, Scott Logan. "HIGH VOLTAGE RESONANT SELF-TRACKING CURRENT-FED CONVERTER." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/254.
Повний текст джерелаŠpinar, Marek. "Ověření provozní výkonnosti a optimalizace FVE." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241950.
Повний текст джерелаChen, Wei. "Low Voltage High Current Power Conversion with Integrated Magnetics." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30518.
Повний текст джерелаPh. D.
Solanki, Jitendra [Verfasser]. "High power factor high-current variable-voltage rectifiers / Jitendra Solanki." Paderborn : Universitätsbibliothek, 2015. http://d-nb.info/1072683474/34.
Повний текст джерелаMugala, Gavita. "High frequency characteristics of medium voltage XLPE power cables." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-560.
Повний текст джерелаTwining, Erika. "Voltage compensation in weak distribution networks using shunt connected voltage source converters." Monash University, Dept. of Electrical and Computer Systems Engineering, 2004. http://arrow.monash.edu.au/hdl/1959.1/9701.
Повний текст джерелаChen, Cheng. "The Impact of Voltage Dip Characteristics on Low Voltage Ride Through of DFIG-based Wind Turbines." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254388.
Повний текст джерелаDe senaste tio åren har sett en stor ökning av installerad effekt av vindkraft.Mer vindkraft i elnäten har lett till större uppmärksamhet om dess tekniskautmaningar. Den dubbelmatad asynkrongenerator (DFIG) är idag denvanligaste förekommande typen i vindkraftverk. Den är mycket känslig förspänningssänkningar. Förbättring av tålighet för spänningssänkningar (LVRT)är en av de viktigaste frågorna för DFIG, och många studier har redan söktlösningar.I befintliga studier om LVRT har spänningssänkningarna skiljt sig väsentligtfrån verkliga vågformer, då de inte har tagit hänsyn till realistiskavindparkkonfigurationer och betydande påverkan av ytterligare egenskaper hosspänningssänkningar. För att stödja utvecklingen av praktiska LVRT lösningarbehövs mer kunskap om spänningssänkningar för att bedöma dess verkligainverkan.Detta examensarbete förbättrar LVRT analysen av DFIG genom att tillämpakunskap om spänningssänkningar från elkvalitetsområdet, tillsammans medrealistiska vindparkskonfigurationer. Inflytandet av ändringar i fasvinkel(PAJ), fasvinkeln vid sänkning och återhämtning (POW), spänningsåterhämtning, transformatorkonfigurationer, last och många andra egenskaperav spänningssänkningar ingår också. Inflytandet av många egenskaper avspänningssänkningar studeras här akademiskt för första gången. Denkaraktäristik av realistiska spänningssänkningar som inträffar vid generatornspoler, och de effekter dessa har, studeras och förklaras genom teoretisk analysoch intensiva simuleringar.
Franchi, Jimmy. "Investigation of the electronicstructures of single molecularjunctions from current voltage characteristics." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-129288.
Повний текст джерелаSosnowski, J. "Influence of Nano-defects on Current-voltage Characteristics of HTc Superconductors." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35112.
Повний текст джерелаTiancheng, Zhang, and Zhang Yunlin. "High voltage Direct Current lines in the Chinese electric power system." Thesis, Blekinge Tekniska Högskola, Institutionen för tillämpad signalbehandling, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-12757.
Повний текст джерелаRidenour, Daniel Keith. "Examination of Power Systems Solutions Considering High Voltage Direct Current Transmission." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/63927.
Повний текст джерелаMaster of Science
Gammon, Tammy Lea. "Improved arcing-fault current models for low-voltage power systems (<1kV)." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/15675.
Повний текст джерелаJimenez, Carrizosa Miguel. "Hierarchical control scheme for multi-terminal high voltage direct current power networks." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112039/document.
Повний текст джерелаThis thesis focuses on the hierarchical control for a multi-terminal high voltage direct current (MT-HVDC) grid suitable for the integration of large scale renewable energy sources. The proposed control scheme is composed of 4 layers, from the low local control at the power converters in the time scale of units of ms; through distributed droop control (primary control) applied in several terminals in the scale of unit of seconds; and then to communication based Model Predictive Control (MPC) that assures the load flow and the steady state voltage/power plan for the whole system, manage large scale storage and include weather forecast (secondary control); finally reaching the higher level controller that is mostly based on optimization techniques, where economic aspects are considered in the same time as longer timespan weather forecast (tertiary control).Concerning the converters' level, special emphasis is placed on DC/DC bidirectional converters. In this thesis, three different topologies are studied in depth: two phases dual active bridge (DAB), the three phases DAB, and the use of the Modular Multilevel Converter (MMC) technology as DC/DC converter. For each topology a specific non-linear control is presented and discussed. In addition, the DC/DC converter can provide other important services as its use as a direct current circuit breaker (DC-CB). Several operation strategies are studied for these topologies used as DC-CB.With respect to primary control, which is the responsible to maintain the DC voltage control of the grid, we have studied several control philosophies: master/slave, voltage margin control and droop control. Finally we have chosen to use droop control, among other reasons, because the communication between nodes is not required. Relative to the secondary control, its main goal is to schedule power transfer between the network nodes providing voltage and power references to local and primary controllers, providing steady state response to disturbances and managing power reserves. In this part we have proposed a new approach to solve the power flow problem (non-linear equations) based on the contraction mapping theorem, which gives the possibility to use more than one bus for the power balance (slack bus) instead of the classic approach based on the Newton-Raphson method. Secondary control plays a very important role in practical applications, in particular when including time varying power sources, as renewable ones. In such cases, it is interesting to consider storage devices in order to improve the stability and the efficiency of the whole system. Due to the sample time of secondary control is on the order of minutes, it is also possible to consider different kinds of forecast (weather, load,..) and to achieve additional control objectives, based on managing storage reserves. All these characteristics encourage the use of a model predictive control (MPC) approach to design this task. In this context, several possibilities of optimization objective were considered, like to minimize transmission losses or to avoid power network congestions.The main task of tertiary control is to manage the load flow of the whole HVDC grid in order to achieve economical optimization. This control level provides power references to the secondary controller. In this thesis we were able to maximize the economic profit of the system by acting on the spot market, and by optimizing the use of storage devices. In this level it is again used the MPC approach.With the aim of implementing the hierarchical control philosophy explained in this thesis, we have built an experimental test bench. This platform has 4 terminals interconnected via a DC grid, and connected to the main AC grid through VSC power converters. This DC grid can work at a maximum of 400 V, and with a maximum allowed current of 15 A
Bhattacharya, Subroto. "Simulation of transient phenomena in high voltage direct-current converter systems." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26959.
Повний текст джерелаApplied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
Xie, Chunchao. "Determinism of power supply harmonic impedance by direct methods." Thesis, Staffordshire University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272819.
Повний текст джерелаGeury, Thomas. "Smart matrix converter-based grid-connected photovoltaic system for mitigating current and voltage-related power quality issues on the low-voltage grid." Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/243967.
Повний текст джерелаDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Kondo, Takeshi. "Current-voltage characteristics of organic semiconductors interfacial control between organic layers and electrodes /." Diss., Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-05022007-122219/.
Повний текст джерелаDr. Marder Seth R, Committee Chair ; Dr. Kippelen Bernard, Committee Co-Chair ; Dr. Brďas Jean-Luc E, Committee Member ; Dr. Perry Joseph W, Committee Member ; Dr. Srinivasarao Mohan, Committee Member.
Suri, Ramaa Saket. "Design of Voltage Boosting Rectifiers for Wireless Power Transfer Systems." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1505212/.
Повний текст джерелаGannett, Robert Ashley. "Control Strategies for High Power Four-Leg Voltage Source Inverters." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/34251.
Повний текст джерелаMaster of Science
Lam, Hoi-yee. "Voltage-current trajectory a 2-dimensional approach to understand electrical load signatures /." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B3890861X.
Повний текст джерелаMbeutcha, France Gaspari. "A High-Side Wideband Current and Voltage Sensor for Radio-Frequency Power Amplifiers." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17464/.
Повний текст джерелаMyhre, Jørgen Chr. "Electrical Power Supply to Offshore Oil Installations by High Voltage Direct Current Transmission." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, 2001. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-383.
Повний текст джерелаThis study was initiated to investigate if it could be feasible to supply offshore oil installations in the North Sea with electrical power from land. A prestudy of alternative converter topologies indicated that the most promising solution would be to investigate a conventional system with reduced synchronous compensator rating.
The study starts with a summary of the state of power supply to offshore installations today, and a short review of classical HVDC transmission. It goes on to analyse how a passive network without sources influences the inverter. The transmission, with its current controlled rectifier and large inductance, is simulated as a current source. Under these circumstances the analysis shows that the network frequency has to adapt in order to keep the active and reactive power balance until the controllers are able to react. The concept of firing angle for a thyristor is limited in a system with variable frequency, the actual control parameter is the firing delay time.
Sensitivity analysis showed some astonishing consequences. The frequency rises both by an increase in the active and in the reactive load. The voltage falls by an increase in the active load, but rises by an increase in the inductive load.
Two different control principles for the system of inverter, synchronous compensator and load are defined. The first takes the reference for the firing delay time from the fundamental voltage at the point of common coupling. The second takes the reference for the firing delay time from the simulated EMF of the synchronous compensator. Of these, the second is the more stable and should be chosen as the basis for a possible control system.
Two simulation tools are applied. The first is a quasi-phasor model running on Matlab with Simulink. The other is a time domain model in KREAN. The time domain model is primarily used for the verification of the quasi-phasor model, and shows that quasi-phasors is still a valuable tool for making a quick analysis of the main features when the details of the transients are of less importance.
The study indicates that power supply by HVDC transmission from land to offshore oil installations could be technically feasible, even without the large synchronous compensators normally required. It has been shown that in a network only supplied by an inverter, variations of active and reactive loads have significant influence on both voltage and frequency. Particularly it should be noted that the frequency shows a positive sensitivity to increases in load. This could make the system intrinsically unstable in the case of a frequency dependent load such as motors.
It was not a part of the study to optimize controllers, but even with simple controllers it was possible to keep the frequency within limits given by norms and regulations, but the voltages were dynamically outside the limits, though not very far. These voltage overswings take place in the first few instances after a disturbance, so it takes unrealistically fast controllers to handle them. They are partly due to the model, where the land based rectifier and the DC reactors are simulated by a constant current source, but partly they have to be handled by overdimensioning of the system.
The simulations indicate that it should be technically possible to supply an oil platform with electrical power from land by means of HVDC transmission with small synchronous compensators. Whether this is financially feasible has not been investigated. Neither has it been considered whether the necessary equipment can actually be installed on an oil platform.
Recently both ABB and Siemens have presented solutions for HVDC transmission in the lower and medium power range based on voltage source converters based on IGBTs. Fully controllable voltage source HVDC converters have properties that may be better suited than conventional line commutated current source thyristor inverters, to supply weak or passive networks, such as offshore oil installations, with electrical power. But they also have some disadvantages, and a complete technical and financial comparison must be performed in order to decide about any potential project.
Bicer, Nazan. "A Current Source Converter Based Statcom For Reactive Power Compensation At Low Voltage." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/2/12612007/index.pdf.
Повний текст джерелаGiraneza, Martial. "High voltage direct current (HVDC) in applications for distributed independent power providers (IPP)." Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/1077.
Повний текст джерелаThe development of power electronics did remove most of technical limitations that high voltage direct current (HVDC) used to have. HVDC, now, is mostly used for the transmission of bulk power over long distances and for the interconnection of asynchronous grid. Along with the development of the HVDC, the growth of power demand also increased beyond the utilities capacities. Besides the on-going increasing of power demand, the reforms in electricity market have led to the liberalization and the incorporation of Independent power providers in power system operation. Regulations and rules have been established by regulating authority for grid integration of Independent power providers. With the expected increase of penetration level of those new independent power providers, result of economic reason and actual green energy trend, best method of integration of those new power plants are required. In this research HVDC technology, namely VSC-HVDC is used as interface for connecting independent power providers units to the grid. VSC-HVDC has various advantages such as short-circuit contribution and independent control of active and reactive power. VSC-HVDC advantages are used for a safe integration of IPPs and make them participate to grid stabilization. MATLAB/Simulink simulations of different grid connected, through VSC-HVDC system, IPPs technologies models are performed. For each IPP technology model, system model performances are studied and dynamics responses during the disturbance are analyzed in MATLAB/ Simulink program. The simulation results show that the model satisfy the standard imposed by the regulating authority in terms of power quality and grid support. Also the results show the effect of the VSC-HVDC in preventing faults propagation from grid to integrated IPPs units.
Lam, Hoi-yee, and 林凱儀. "Voltage-current trajectory: a 2-dimensional approach to understand electrical load signatures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B3890861X.
Повний текст джерелаFuentes-Rosado, J. "Test characteristics and operation of surge arrester elements." Thesis, Cardiff University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283894.
Повний текст джерелаMiwa, Hidekazu. "High-Efficiency Low-Voltage High-Current Power Stage Design Considerations for Fuel Cell Power Conditioning Systems." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/42519.
Повний текст джерелаMaster of Science
Nightingale, Wendy Denise. "Electrical characteristics if an identified insect motoneurone cell body : a current- and voltage-clamp." Thesis, University of St Andrews, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329911.
Повний текст джерелаJacobs, D. M. (Danver Maxwill). "Voltage control of medium to high power three-phase inverter supply systems." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52608.
Повний текст джерелаENGLISH ABSTRACT: In this thesis a new voltage control method is developed for a three-phase inverter supply system. The inverter supply system consist of a Permanent Magnet Generator, a three-phase rectifier, a three-phase inverter plus LC-filter and a three-phase transformer in series. This system supplies power to a network or to a stand-alone load. The main focus of this thesis is on the control aspects of the inverter and the LC-filter. Different voltage control systems are investigated and compared to each other. From these methods the proposed voltage control method is developed where only the output voltages are measured to establish good voltage control. All these voltage control methods are also simulated with a software package. The proposed voltage control method compares very well with other voltage control methods. The results that are obtained in the simulations are satisfactory. The proposed voltage control method is also implemented in an 8 kW laboratory scale model and, again, very good practical results are obtained. A TMS320F240 nsp controller is used to implement the proposed voltage control method. The controller compensates well for load steps, and these results compare well to an alternative voltage control method, which was also evaluated practically.
AFRIKAANSE OPSOMMING: In hierdie tesis IS 'n nuwe spanningsbeheermetode ontwikkel VIr 'n drie-fase wisselrigter kragtoevoerstelsel. Die wisselrigter kragtoevoerstelsel bestaan uit 'n Permanent Magneet Generator, 'n drie-fase gelykrigter, 'n drie-fase wisselrigter plus Le-filter, en 'n drie-fase transformator in serie. Hierdie stelsel voorsien krag aan 'n netwerk sowel as aan 'n alleenstaande las. Die hooffokus van hierdie tesis is op die beheeraspekte van die wisselrigter en Le-filter. Verskillende spanningsbeheermetodes is deeglik ondersoek en vergelyk met mekaar. Uit hierdie metodes is dan die voorgestelde beheermetode ontwikkel waar slegs die uittreespanning gemeet word om goeie spanningsbeheer te kan doen. Al hierdie spanningsbeheermetodes is dan gesimuleer met 'n sagteware pakket. Die voorgestelde spanningsbeheermetode vergelyk baie goed met die ander spanningsbeheermetodes. Die resultate verky in die simulasies is ook baie bevredigend. Die voorgestelde beheermetode is ook geïmplementeer op 'n 8 kW laboratorium skaalmodel en weereens is baie goeie praktiese resultate verky. 'n TMS320F240 DSP-beheerder is gebruik om die voorgestelde beheermetode mee te implementeer. Die beheerder kompenseer baie goed vir lastrappe en vergelyk ook goed met 'n ander spanningsbeheermetode wat prakties ge-evalueer is.
Al-Ziayree, Ali Mahdi Lafta. "Contactless, high resolution characterization of current and voltage waveforms within high power communication amplifiers." Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/110309/.
Повний текст джерелаLópez, Julià Toni. "Prospects of voltage regulators for next generation computer microprocessors." Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/77908.
Повний текст джерелаTong, Sai-kit. "A computer-aided measurement system for monopolar high-voltage direct-current coronating lines /." [Hong Kong] : University of Hong Kong, 1986. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12321771.
Повний текст джерелаHossin, Mohamad Abdalla. "Evaluation of gallium arsenide Schottky Gate Bipolar Transistor for high-voltage power switching applications." Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263129.
Повний текст джерела湯世傑 and Sai-kit Tong. "A computer-aided measurement system for monopolar high-voltage direct-current coronating lines." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1986. http://hub.hku.hk/bib/B31207467.
Повний текст джерелаYao, Liangbin. "HIGH CURRENT DENSITY LOW VOLTAGE ISOLATED DC-DC CONVERTERSWITH FAST TRANSIENT RESPONSE." Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3205.
Повний текст джерелаPh.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering PhD
Borzdov, A. V., V. M. Borzdov, D. V. Pozdnyakov, and F. F. Komarov. "Influence of Impact Ionization Process on Current-Voltage Characteristics of Nanoscale Silicon n-Channel MOSFET." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35371.
Повний текст джерелаNightingale, Wendy Denise. "Electrical characteristics of an identified insect motoneurone cell body : a current- and voltage-clamp study." Thesis, University of St Andrews, 1989. http://hdl.handle.net/10023/14077.
Повний текст джерелаKalyani, Radha Padma. "A nonlinear optimization approach for UPFC power flow control and voltage security." Diss., Rolla, Mo. : University of Missouri-Rolla, 2007. http://scholarsmine.mst.edu/thesis/pdf/Kalyani_completeThesis_09007dcc80438f59.pdf.
Повний текст джерелаVita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed November 29, 2007) Includes bibliographical references.
Ntshangase, Zola. "A study of fire-induced air-gap voltage breakdown characteristics under HVDC conditions." Thesis, 2012. http://hdl.handle.net/10413/8300.
Повний текст джерелаThesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2012.
Shepard, Marshall Howard. "Low voltage power conversion." Master's thesis, 2003. http://hdl.handle.net/1885/148715.
Повний текст джерелаChen, Hung-Shing, and 陳鴻興. "High-Voltage, Direct Current electric power transmission systems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/16143227593366434479.
Повний текст джерела聖約翰科技大學
自動化及機電整合研究所
96
As result of liberalization on the electrical market, expend the system scale which becomes complicated day after day. Therefore, the network application on innovation and skill improvement is significant. HVDC (High Voltage Direct Current transmission) and FACTS (Flexible AC Transmission Systems) plays the important role on the innovation and skill improvement application. HVDC and FACTS applies in commercial use from 1950s. For AC transmission, HVDC becomes a reliable and cost saving alternative also it provides the operating friendly. This paper is to study the application of HVDC and its future proactive. Integrating HVDC and FACTS of AC system is frequently been applied, because it can simplify the system structure, control the loading, improve the efficacy of system dynamics and increase the reliability of the system. For the interconnection of large sized HVDC and FACTS electric system, it provides the advantages of skills and cost savings, especial obvious under the poor interconnection. Uses of HVDC, the system can connect to the long distance power-stations, such as offshore wind generate electric power. The advantages of the HVDC application is discussed and proved in this paper.
Zheng, Bo-Ren, and 鄭博任. "Current-Voltage and Capacitance-Voltage Characteristics of Porous Structure and Its Applications on Sensors." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/26452987842140119011.
Повний текст джерела聖約翰科技大學
電子工程系碩士班
97
In the first, the n-type silicon wafers are used as the raw materials for porous silicon structures which can be served as ethanol sensors. It is found that different porous silicon structure would cause the different sensitivity on ethanol. With the advantages of low cost, easy fabrication, and large surface area density, the porous silicon can be the candidate of sensors. In our experiments, various sizes including the depth, width, and porosity of porous silicon structures cause different sensitivities of porous silicon sensors. To realize the relationship between the structures and their performance, the porous silicon samples are analyzed by SEM、3D Profile、FTIR and I-V/C-V measurements. Besides, a special etching container is designed for double-side porous silicon structure. In the study, the p-type silicon wafers are used as the raw materials. In the first, the porous silicon film is formed on the normal polished side. After that, the anode and cathode are changed during the process, and the porous silicon film is formed on the other side. Such double-side porous silicon samples are also analyzed by photoluminescence spectrometer, SEM, and I-V measurements. Such a design is useful for the double-side fabrication process.
Yehia, Ali Mustafa Doaa Mokhtar. "Deliverable Power Characteristics in Low-Voltage DC Distribution System Based on Voltage Stability." Thesis, 2011. http://hdl.handle.net/2237/16630.
Повний текст джерела