Дисертації з теми "Three-phase power supply system"
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Jacobs, 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.
Cheng, Limin. "A universal controller for a single-phase uninterruptible power supply system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0001/MQ42361.pdf.
Повний текст джерелаMesbahi, Abdessamad. "Deterministic and Stochastic Economic Modeling of Hybrid Power Supply System with Photovoltaic Generators." Master's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/42555.
Повний текст джерелаLoubser, Karl Albie. "An experimental study of an inherently-safe, natural circulating, flash-tube type system for a nuclear reactor steam supply concept." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96050.
Повний текст джерелаENGLISH ABSTRACT: This project investigates aspects of a novel inherently safe nuclear power steam supply system as safety is of paramount importance. The system envisaged has unique features namely: a) a two-phase flow flash-tube type natural circulating primary loop (also the secondary radioactive particle containment); b) a twophase flow thermosyphon heat pipe type heat exchanger secondary loop is used to transfer heat from the primary loop to the steam generators, thereby physically separating the two flow streams from one another; c) a natural convection air cooled condenser for the removal of the reactor’s residual heat; d) a unique core using TRISO type fuel (acting as the primary radioactive particle containment) with life of at least 8.9 years; e) a steel containment vessel acting as a tertiary radioactive product containment; f) a concrete containing structure with air vents to allow air to pass over the main steel containment vessel for cooling purposes in the case of an emergency, and for the removal of parasitic heat during operation. In particular the primary and secondary loops of the proposed system are investigated. This is done by design, construction and testing of a small scale experimental set-up of the primary and secondary loops as well as the development of theoretical models for the two loops. A literature survey focusing on nuclear technology, thermosyphon loops, natural circulating loop instabilities, heat pipes, and two-phase flow modelling is presented to give a brief overview of the technologies as well as tools used in the work undertaken. Observations of the inside flow behaviour of the primary loop experimental set-up were made possible by windows providing many insights into the inner workings, such as plume formation and geysering. The transient response of the secondary heat pipe loop start-up is also investigated. A thermal resistance theoretical model was developed for the secondary loop using heat transfer formulae from theory as well as experimentally semiempirical correlated formula. Different states of operation of the secondary loop were observed during testing with the theoretical model of the condensing regime correlating well, two-phase regime correlating acceptably and liquid regime correlating poorly to experimental results and thus were modelled using an experimentally determined overall heat transfer coefficient. The secondary loop model of the liquid regime is coupled with the primary loop theoretical model to predict the system’s performance. A homogeneous, one-dimensional, simple theoretical model for the primary loop was derived and computer simulated. The results did not compare well with experimental results for single phase flow and failed to capture the onset of two-phase flow. The assumptions of one dimensional model with a unidirectional flow, a hydrostatic pressure problem, a constant volumetric flow rate and the inability of the implementation of the code to handle expansion are noted as some of the flaws in the theoretical model. The following recommendations are made: a more advanced design of the pressuriser should be incorporated into the experiment; the secondary loop’s theoretical model should be characterised under a broader set of operating conditions; the computer program can be used as the basis for further research and implementation of alternative solution algorithms and models.
AFRIKKANSE OPSOMMING: Hierdie projek ondersoek aspekte van ’n ongewone, essensieel veilige kernkrag stoomtoevoer-stelsel, omdat veiligheid van kardinale belang is. Die stelsel wat voorgestel is, het unieke eienskappe, naamlik: a) ’n twee-fasevloei flits-buistipe natuurlik sirkulerende primêre lus (wat ook die sekondêre inperking van radioaktiewe materiaal bevat); b) ’n twee-fasevloei termo-heweleffek sekondêre lus hitte-pyp hitte-uitruiler word gebruik om die hitte vanaf die primêre lus oor te dra na die stoomkragopwekkers en daardeur word die twee strome se vloei fisies geskei van mekaar; c) ’n natuurlike konveksie lugverkoelde kondensor word gebruik vir die verwydering van die reaktors se oortollige hitte; d) ’n unieke kern gebruik TRISO-tipe brandstof (wat as die primêre inperking van radioaktiewe materiaal optree) met ’n lewe van minstens 8.9 jaar; e) ’n inperkingshouer van staal wat optree as ’n tersiêre radioaktiewe produkhouer; f) ’n betonstruktuur met lugventilasie om toe te laat dat lug oor die hoof staalhouer vloei vir verkoeling in ’n noodgeval, en vir die verwydering van parasitiese hitte tydens werking. Hoofsaaklik word die primêre en sekondêre lusse van die voorgestelde stelsel ondersoek. Dit word gedoen deur die ontwerp, konstruksie en die toets van ’n eksperimentele opstelling van die primêre en sekondêre lusse op klein skaal, sowel as die ontwikkeling van teoretiese modelle vir die twee lusse. ’n Literatuurstudie wat fokus op kerntegnologie, termo-heweleffeklusse, natuurlik sirkulerende lus instabiliteit, hitte-pype, en twee-fase vloeimodellering word aangebied om ’n kort oorsig te gee van die tegnologie, sowel as gereedskap gebruik in die werk wat onderneem is. Om die interne vloeigedrag van die primêre lus se eksperimentele opstelling waar te neem, word daar gebruik gemaak van vensters wat dien as ’n manier om die innerlike werking van die proses soos pluimvorming en die kook van die water in die warmwaterkolom te toon. Die oorgangsreaksie van die sekondêre hittepyplus aanvangs is ook ondersoek. ’n Teoretiese termiese weerstandmodel is ontwikkel vir die sekondêre lus met behulp van hitte-oordragformules waarvoor hitte-oordragteorie gebruik is, wat met eksperimentele semi-empiriese formules gekorreleer is. Verskillende toestande van die sekondêre lus se werking is waargeneem gedurende die toetse. Die teoretiese model het goed met die kondensasiestaat gekorreleer, terwyl by die twee-fasewerkswyse aanvaarbare korrellasies aangetref is en die uiteindelike vloeitoestand swakker gekorrelleer het met eksperimentele resultate en dus gemodelleer is met behulp van die NTU-effektiwiteitsmetode. Die sekondêre lusmodel van die vloeistoftoestand is gekoppel met die primêre lus teoretiese model om die werking van die stelsels te voorspel. ’n Homogene een-dimensionele eenvoudige teoretiese model van die primêre lus is afgelei en ’n rekenaar simulasie is uitgevoer. Die resultate vergelyk nie goed met die eksperimentele resultate vir enkelfasevloei en kon nie die aanvang van twee-fasevloei beskryf nie. Die aannemings van ’n een-dimensionele model met eenrigting vloei, ’n hidrostatiese druk probleem, ’n konstant volumetries vloeitempo en die onvermoë van die implementering van die kode om uitbreiding te hanteer is bekend as ’n paar van die foute in die teoretiese model. Die volgende aanbevelings word gemaak: ’n meer gevorderde ontwerp van drukreëlaar moet in die eksperiment ingesluit word; die sekondêre lus se teoretiese model moet gekenmerk word onder ’n wyer stel bedryfsomstandighede, en die rekenaar program kan gebruik word as die basis vir verdere navorsing en die implementering van alternatiewe algoritmes en modelle.
Сиротин, Юрий Александрович. "Компенсация и учет реактивной мощности в электротехнических системах с несимметричными режимами". Thesis, НТУ "ХПИ", 2014. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21116.
Повний текст джерелаThesis for a Doctor’s degree in Engineering Sciences by specialty 05.09.03 - Electrical Engineering Complexes and Systems. - National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2015. The dissertation is devoted an important scientific and technical issues to improve the power quality of supply and consumption (SC) in three-phase networks through further development of die power theory, development of methods and ways of compensation, proposals for the accounting and payment of the inactive components of the apparent power (AP). A generalized mathematical model (GMM) of electric power processes (EPP) in a 3-phase SC scheme was developed. The model of 3-wire circuit is provided by a special (О-balanced) mode of the model 4-wire circuit The developed GMM classifies the SC modes using the vectorial instantaneous power (IP) and summarizes the class of models used in the theory of IP. For sinusoidal mode with asymmetric voltage the refines vectorial mathematical model (VMV) 3-phasors (complex rms vectors) was created. The analytical expressions for the integral characteristics of the classified modes are founded and their relationship with standard IP and vectorial IP are established. With asymmetrical voltage and asymmetrical loading a sinusoidal mode can be both unbalanced and pulsed. Each mode is represented by its power equation and the equivalent orthogonal decomposition of the 3-phase current Both decompositions are used to create the optimal mode of SC with a constant IP at asymmetrical voltage. The proposed compensator provides the non-puised energy supply with the highest possible power factor and with the same average (active) power as the initial current. Based on the evaluation and calculation of the power equation components of a unbalanced mode was developed a methodology for calculating the loss of the measuring selection. A methodology and technique of analytical calculation of additional losses on the passport data of the connected electrical equipment was proposed. Formulated and proved offers on differential measurement and payment of the energy components of AP will stimulate consumer sets the compensator, and provide a reliable methodology for improving the quality of SC (within unbalance loading and voltage).
Beber, DG. "DSP controlled three phase to single phase uninterruptible power supply." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/5244.
Повний текст джерелаWith the increase in use of electronic equipment such as personal computers, network stations and AC drive conrollers, an increased "polution" of the AC mains has resulted in the form of unwanted harmonics generated by the switching currents associated with these devices. Combined with the problem of mains "pollution" is the problem of balancing a large number of single phase loads onto a three phase supply, such as in a large computer network. This has resulted in more frequent supply voltage failure, causing substantial data and financial loss and in the extreme case death due to hospital equipment not being powered. Thus the need for an uninterruptible power supply (UPS) which is capable of resolving these problems. Taking these considerations into account, a three to single phase converter topology was developed and tested, using a Texas Instruments TMS320F243 Digital Signal Processor (DSP) for control of the system. The topology is based on a technique that utilises minimal semiconductor devices whilst still allowing for sinusoidal current to be drawn from the mains supply.
Danko, Donald. "Configurable Frequency and Voltage Three Phase Power Supply." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1559166225004371.
Повний текст джерелаMagozore, Caxton. "DSP phase angle controlled three phase to single phase uninterruptible power supply." Master's thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/5177.
Повний текст джерелаUys, Jacobus Johannes. "Dynamic digital control schemes for three-phase UPS inverters." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52810.
Повний текст джерелаENGLISH ABSTRACT: This thesis presents the design and implementation of a voltage controller for an Uninterruptible Power Supply (UPS) Inverter. The inverter is capable of producing a nearly sinusoidal output voltage waveform, thereby keeping the Total Harmonic Distortion (THD) to a minimum. Digital controllers introduce a time delay in the control law that causes system instability. Various control techniques, which includes Pade approximations and system augmentation, are investigated to eliminate the effect of the time delay. These controllers employ classical control as well as modem control techniques. The selection of the various control parameters is verified by mathematical equations. A load-disturbance compensation scheme, implementing feed-forward and gain scheduling, is also developed to improve voltage distortion when varying loads, such as non-linear loads, are connected to the system. It is shown that the constructed pulse-width modulated (PWM) control scheme can achieve fast dynamic response as well as a low THD.
AFRIKAANSE OPSOMMING: Hierdie verhandeling ondersoek die ontwerp en implementering van 'n spanningsbeheerder vir 'n ononderbroke kragtoevoer omsetter. Die stelsel produseer 'n uittree spannigsgolfvorm met 'n lae Totale Harmoniese Distorisie (THD). Digital beheerders veroorsaak 'n tydvertraging in die beheerwet wat stelsel onstabiliteit kan veroorsaak. Verskeie beheertegnieke wat gebaseer is op die Pade benaderings van die tydvertraging en stelsel aanpassings, is ondersoek. Hierdie beheerders maak gebruik van klassieke en moderne beheertegnieke. Die seleksie van die verskeie beheerderveranderlikes word gestaaf deur wiskundige vergelykings. Spannigsvervorming word tot 'n minimum beperk deur gebruik te maak van 'n lasveranderings-kompensasietegniek wat onderskeidelik vorentoe-voer en aanwins skedulering implementeer. Verder word daar bewys dat die pulswydte modulasie (PWM) beheerskema vinnige dinamiese gedrag asook 'n lae THD bewerkstellig.
Karshenas, Hamid Reza. "Input/output harmonic free current link three-phase AC power supply." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ28287.pdf.
Повний текст джерелаCetinkaya, Suleyman. "Repetitive Control Of A Three-phase Uninterruptible Power Supply With Isolation Transformer." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608150/index.pdf.
Повний текст джерелаPande, Manish. "Three-phase voltage-type AC to DC power supply with improved performance." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0018/NQ35276.pdf.
Повний текст джерелаДрабик, Владислав Русланович, та Drabyk Vladyslav. "Проект енергоефективної системи електропостачання кормоцеху". Master's thesis, ЗМІСТ ВСТУП 7 1 АНАЛІТИЧНА ЧАСТИНА 9 1.1 Загальна характеристика господарства ТОВ «Агрокорм» 9 1.2 Аналіз і оцінка заходів електрозбереження та вирівнювання добового графіка електричних навантажень промислових підприємств 11 1.3 Оптимізація добового графіка електричного навантаження 16 2 НАУКОВО-ДОСЛІДНА ЧАСТИНА 20 2.1 Оптимізація показників добового графіка електричного навантаження кормоцеху 20 2.1 Оптимізація показників добового графіка електричного навантаження кормоцеху 25 3 ТЕХНОЛОГІЧНА ЧАСТИНА 29 3.1 Розрахунок електричних навантажень силової мережі кормоцеху 29 3.2 Розрахунок освітлювальної мережі 34 3.3 Розрахунок і вибір пускозахисної апаратури силових і освітлювальних мереж 39 3.3.1. Вибір пускозахисної апаратури для силового устаткування 39 3.3.2 Вибір пускозахисної апаратури для освітлювального обладнання. 41 3.3.3 Перевірка на узгодження струмів уставок ПЗА і тривало допустимих струмів провідників. 41 4 ПРОЕКТНО-КОНСТРУКТОРСЬКА ЧАСТИНА 45 4.1 Розробка системи електропостачання кормоцеху 45 4.1.1 Визначення розрахункової потужності на введенні. 45 4.1.2 Вибір коефіцієнта потужності. 50 4.1.3 Вибір трансформаторної підстанції 51 4.1.4 Вибір проводу і розрахунок мережі 0,4 кВ на падіння напруги. 52 4.2 Вибір лічильників для обліку електроенергії 53 6 4.2.1 Багатофункціональний лічильник електричної енергії серії SL7000 Smart 54 4.3 Заходи по компенсації реактивної потужності у кормоцеху 57 4.4 Перевірка вибраної пускозахисної апаратури кормоцеху на автоматичне спрацьовування і селективність роботи 59 4.4.1 Розрахунок струмів короткого замикання 59 4.4.2 Перевірка ПЗА на автоматичне спрацьовування і відключаючу здатність 62 5 СПЕЦІАЛЬНА ЧАСТИНА 65 5.1 Інтегрована модель графіка електричного навантаження кормоцеху з врахуванням споживачів-регуляторів 65 5.2 Дослідження графіка електричного навантаження кормоцеху 67 5.3 Порівняння показників графіка електричного навантаження кормоцеху до і після блоку оптимізації 71 6 ОБГРУНТУВАННЯ ЕКОНОМІЧНОЇ ЕФЕКТИВНОСТІ 74 Економічна ефективність роботи кормоцеху при різних тарифних системах (диференційованих по зонах доби) оплати електричної енергії 74 7 ОХОРОНА ПРАЦІ ТА БЕЗПЕКА В НАДЗВИЧАЙНИХ СИТУАЦІЯХ 82 7.1 Заходи безпеки при роботі кормоцеху ТОВ “Агрокорм” 82 7.2 Розрахунок захисного заземлення 85 7.3 Загальні положення з евакуації при виникненні надзвичайної ситуації 89 8 ЕКОЛОГІЯ 92 8.1 Аналіз впливу виробничих дій підприємства на довкілля 92 8.2 Заходи і засоби захисту довкілля від викидів підприємства 94 ЗАГАЛЬНІ ВИСНОВКИ ДО ДИПЛОМНОЇ РОБОТИ 96 ПЕРЕЛІК ПОСИЛАНЬ 98, 2019. http://elartu.tntu.edu.ua/handle/lib/29598.
Повний текст джерелаIn diploma work the project of the energy-efficient system of power supply to feeding room of industrial enterprise of LTD «Agrofeed» is carried out and events that is sent to electro-maintenance and smoothing of day's load-graph are considered. The decided basic questions are from a power supply and defence of power energy-efficient electrical equipment to feeding room. The onetransformer is chosen KTS 250-10/0.4 kV. Conducted calculation of the lighting loading on the base of modern light-emitting-diode industrial lamps of Highbay 200. Also, conducted calculation of currents of short circuit, a protective and interconnect apparatus is checked for a sensitiveness to the currents of short circuit, on an automatic wearing-out and disconnecting ability. Smoothing of unevenness of chart of the electric loading came true due to optimization of basic criteria of model of optimization: dispersion of chart of the electric loading diminished on 26,4%, a fillfactor increased and the coefficient of maximum diminished.
Raval, Chintan A. "Three-phase ac-dc power supply design and experiments using a sic based power module." Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/35520.
Повний текст джерелаDepartment of Electrical and Computer Engineering
Behrooz Mirafzal
The rise of Wide Band Gap (WBG) devices has brought excitement in the field of Power converters. The WBG based converter can operate at the very high frequency and temperature making them ideal to use in harsh environments. The commercialization of WBG devices such as SiC and GaN MOSFETs has made it interesting for power engineering professionals all over the world. The use of WBG devices capable of operating at high switching frequencies reduces the overall system size dramatically with added benefit of improved power quality at high temperature. The main goal of this thesis is to design and test an AC-DC converter based on a SiC power module. The designed rectifier can be considered an active rectifier equipped with a controller to constantly provide feedback for modification of switching signals to get the desired output voltage. The designed active rectifier converts the varying frequency input power supply into rectified DC voltage while keeping the power factor of the system to unity. This thesis covers elementary information on power supply design, switching schemes and design of the controller. System arrangement will provide more light on the use of Six Channel MOSFET Gate Driver from CREE with the overall experimental setup. The experimental analysis will summarize the behavior of the system where information on achieved rectification, effect on the line currents at the generator and concluding power factor representation is described.
Небера, Ольга Алексеевна. "Совершенствование методов и средств моделирования систем электроснабжения с двигательной нагрузкой". Thesis, НТУ "ХПИ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/20002.
Повний текст джерелаThe thesis for granting the Degree of Candidate of Technical sciences in speciality 05.14.02 - power plants, networks and systems. National Technical University "Kharkiv Politechnic Institute", Kharkiv, 2016. The thesis is devoted to the development of mathematical models of electric power supply systems with motor load that allows to reproduce electromagnetic and electromechanical components of transients in three-phase circuits of arbitrary configuration. In the work current state of the problem, existing methods and tools for simulation of power supply systems were analyzed, first time a mathematical model of transients based on equations in phase coordinates for power supply systems with static elements and rotating electrical machines was developed. Methods of forming and solutions of differential equations in phase coordinates in relation to three-phase systems were improved, method for determining parameters of elements in phase coordinates was proposed, elements of inverse matrices inductance of rotating electric machines in an analytical form were received. First time the method of determining local frequency variations in the electrical systems which provides to increase speed and efficiency of measurement and diagnostic devices was proposed.
Zhang, Huibin. "Application of multilevel inverter as shunt active power filter in three-phase three-wire power system." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501797.
Повний текст джерелаWu, Zhongyu. "Synchronized Phasor Measurement Units Applications in Three-phase Power System." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/51660.
Повний текст джерелаPh. D.
Небера, Ольга Олексіївна. "Вдосконалення методів і засобів моделювання систем електропостачання з двигунним навантаженням". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/20000.
Повний текст джерелаThe thesis for granting the Degree of Candidate of Technical sciences in speciality 05.14.02 - power plants, networks and systems. National Technical University "Kharkiv Politechnic Institute", Kharkiv, 2016. The thesis is devoted to the development of mathematical models of electric power supply systems with motor load that allows to reproduce electromagnetic and electromechanical components of transients in three-phase circuits of arbitrary configuration. In the work current state of the problem, existing methods and tools for simulation of power supply systems were analyzed, first time a mathematical model of transients based on equations in phase coordinates for power supply systems with static elements and rotating electrical machines was developed. Methods of forming and solutions of differential equations in phase coordinates in relation to three-phase systems were improved, method for determining parameters of elements in phase coordinates was proposed, elements of inverse matrices inductance of rotating electric machines in an analytical form were received. First time the method of determining local frequency variations in the electrical systems which provides to increase speed and efficiency of measurement and diagnostic devices was proposed.
Ehlers, P., CG Richards, and DV Nicolae. "Small power, three to one phase matrix converter for wind generators." International Review of Electrical Engineering, 2013. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001152.
Повний текст джерелаParchure, Abhineet Himanshu. "Towards Three-Phase Dynamic Analysis of Large Electric Power Systems." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/54574.
Повний текст джерелаMaster of Science
Sane, Hemant. "Power supply noise analysis for 3D ICs using through-silicon-vias." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33875.
Повний текст джерелаWalraven, Justin Stewart. "Design of an Arbitrary Waveform Generator for Power System Perturbation." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/35493.
Повний текст джерелаMaster of Science
Karsli, V. M. "An investigation into real-time microcontrolled single phase uninterruptible power supply systems." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637763.
Повний текст джерелаRiley, J. M. "The appraisal of three gas-fired small-scale CHP systems." Thesis, Cranfield University, 1997. http://dspace.lib.cranfield.ac.uk/handle/1826/4548.
Повний текст джерелаShen, Zhiyu. "Online Measurement of Three-phase AC Power System Impedance in Synchronous Coordinates." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/49258.
Повний текст джерелаA small-signal analysis that uses interface impedances defined in the synchronous frame is developed by Belkhayat at Purdue in the mid-90s to access the system stability. The system impedance varies with the operating point. Thus the impedance has to be obtained online at the desired operating point, on even in situ.
Literature investigates its use with system models, but the lack of equipment to measure such impedance prevents its use in practical systems. Measurement of impedances of each component enables the prediction of system stability before building the real system. The impedance data can also be used to investigate the instability in the system after it is built. The capability of impedance measurement can save the cost and time of system integrators.
After reviewing the state-of-the-art development of impedance measurement systems, the dissertation analyzes several systematical error sources in the system, which includes the signal processing and sampling circuits, the phase estimation for coordinate transformation and the injection device connection, and proposes the solution to reduce their influence.
Improved algorithm and system architecture are proposed to increase the measurement speed and accuracy. Chirp signal is used as an excitation signal to extract impedances at a group of frequencies at one time. The use of both shunt current injection and series voltage injection improves the SNR of measured signal. Oversampling, cross-correlation and frequency domain averaging technique are used to further reduce the influence of noise.
An instrument is built based on the proposed solution. A voltage source inverter is used to generate the perturbation. A PXI computer is used for real-time signal processing. A PC is used for data post processing and measurement process control. Software is developed to fully automate the measurement. The designed unit is tested with various linear and nonlinear load. The test result shows the validity of the proposed solution.
Ph. D.
Grossman, Hy. "A NEXT GENERATION AIRCRAFT POWER MONITORING SYSTEM." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604535.
Повний текст джерелаHistorically, aircraft power monitoring has required the use of multiple signal conditioning functions to measure various parameters including voltage, current, frequency and phase. This information was then post processed to determine the characteristics of the 3-phase power quality on the aircraft. Recent developments in embedded DSP processors within signalconditioning systems provide the instrumentation engineer with expanded capabilities for realtime on-board power quality monitoring. Advantages include reduced space and bandwidth requirements and minimal wiring intrusion. For each phase, output data may include peak positive and negative voltages and currents, peak-to-peak, average and RMS voltages and currents, phase power (real and apparent), phase power factor, phase period (frequency), phase shift measurement from phase 1 (the reference phase) to phase 2, and from phase 1 to phase 3. In addition, a Fast Fourier Transform (FFT) is performed on each phase voltage to provide Total Harmonic Distortion measurements. This paper describes the methods employed in the implementation of these functions on a single signal-conditioning card in order to provide detailed information about the power quality of a three-phase aircraft power source.
Wen, Bo. "Stability Analysis of Three-Phase AC Power Systems Based on Measured D-Q Frame Impedances." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/51202.
Повний текст джерелаPh. D.
Khaniya, Dina. "Development of three-phase continuation power flow for voltage stability analysis of distribution systems." Master's thesis, Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-11142008-101009.
Повний текст джерелаMilosavljevic, Ivana. "Power Electronics System Communications." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/31218.
Повний текст джерелаMaster of Science
Гулак, Сергій Олександрович. "Підвищення енергетичних показників електровозів змінного струму за рахунок адаптованої до системи електропостачання компенсації реактивної потужності". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2020. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48885.
Повний текст джерелаThesis for a Candidate Degree in Engineering (Doctor of Philosophy) in specialty 05.22.09 - "Electrotransport" 141 - Electric Power Engineering, Electrical Engineering and Electromechanics) - National Technical University "Kharkiv Polytechnic Institute", MES of Ukraine. Kharkiv, 2020. The dissertation is devoted to creation of scientific bases of choice of optimum parameters and modes of operation of the system of reactive power compensation on electric locomotives operating on alternating current. The factors that have the greatest impact on the quality of traction power supply from the side of the electric rolling stock of alternating current are analyzed. Factors that cause the greatest distortion of the voltage form of the catenary include higher harmonic components, which are introduced into the traction power supply system by electric rolling stock. It is shown that such factors as poor current collection, passage of electric rolling stock of the feeder zone, the presence of several units of electric rolling stock in one feeder zone, modes of operation of electric rolling stock lead to the fact that the process of voltage change in the catenary is nondeterministic for the analysis of the spectral composition of the traction current of an electric locomotive, the application of classical Fourier transform methods is incorrect. Analysis of circuit solutions for compensation of reactive power consumed by electric rolling stock of alternating current showed that to date the most optimal solution is the use of hybrid compensators. In such compensators, the passive part reduces the phase shift between the voltage of the secondary winding of the traction transformer and the traction current, and the active part removes the higher harmonic components of the traction current. The active part of the hybrid compensator is a stand-alone current inverter and an inverter control system. The control system performs spectral analysis of the traction current, forms an algorithm for the generation of autonomous inverter higher harmonics, the same amplitude but antiphase to the higher harmonics of the traction current. Existing control systems use Fourier transform methods to determine the spectral components of the traction current, but in real operating conditions of the electric rolling stock they are incorrect. It is proposed to apply the methods of correlation spectral analysis to determine the spectral components of the traction current. Mathematical and program-oriented models of work of traction and auxiliary drive of an electric locomotive of an alternating current (on the example of the locomotive VL-80k) have been created. The unique features of these models are the ability to take into account the mutual influence of the traction and auxiliary drives and the operating modes of electric locomotives. The technique of calculating the parameters of asynchronous motors for asymmetrical stator windings has been improved. The relationship between such parameters as the scattering inductance and the mutual inductance with the geometric parameters of the windings is shown. This technique was used to create a mathematical model for the drive of auxiliary machines, in particular for the simulation of the phase splitter. It is proposed to investigate electrodynamic processes in auxiliary machine actuators in steady state operation, to replace the phase splitter with an asymmetrical voltage system that feeds the motors of fans. The mutual influence of traction actuator and auxiliary motors operation was investigated. The results of the study made it possible to clarify the spectral composition of the current in the traction and auxiliary drive circuits. The use of a hybrid reactive power compensator in traction drive circuits is substantiated. The elements of the passive and active part of the compensator are calculated. A control system for the active part of the reactive power compensator has been developed, which is based on the block of determination of harmonic components of traction current and suppression in the current spectrum of zero and higher harmonic components. A new scientific approach to the determination of the spectral components of the traction current is proposed. It is based on the application of the linear prediction method of Levinson-Darbin. This approach allows to take into account the random nature of the voltage and, as a consequence, the traction current, and to adapt the work of the compensator to the voltage of the contact network. The application of this approach also allows taking into account such factors as the nature of the mode of operation of the electric locomotive, the passage of the boundaries of the sections of the contact network, etc. Adjusted mathematical model of traction actuator when using of reactive power compensator, calculated and constructed amplitude-frequency and phase-frequency spectral characteristics of voltage and current on the traction winding of the transformer. The power factor of the upgraded traction actuator is calculated. The justified is use of a static converter instead of a phase splitter in the auxiliary drive power supply system. The system of mathematical modeling of the auxiliary drive of the electric locomotive is executed; the amplitude-frequency and phasefrequency spectral characteristics of the voltage on the winding of the transformer and the current flowing through the winding of its own needs are calculated and constructed. The power factor of the upgraded auxiliary actuator is calculated. The losses of active and full power in the traction and auxiliary drives of the locomotive were calculated before and after the modernization. The dependences of the efficiency and the power factor of the drives before and after the modernization were calculated. The results obtained indicate that the efficiency of the traction drive after the use of the compensator decreased by 0,6% a factor and the power factor increased by 3,2%. Auxiliary drive efficiency after upgrading increased by 1,5%, and power factor increased by 26,4%. The developed scientific provisions are an effective tool for modernization of the existing fleet of electric locomotives of the VL-80t and VL-80k series and the creation of a new electric rolling stock of railways. The results of the dissertation were implemented at the Scientific Research Design and Engineering Institute of Railway Transport of OJSC "Ukrzaliznytsya" (Kyiv), SE "Ukrainian Research Institute of Carriage" (Kremenchuk) and in the educational process of the State University of Infrastructure and Technology (Kyiv).
Elwakil, Ehab. "A new converter topology for high-speed high-starting-torque three-phase switched reluctance motor drive system." Thesis, Brunel University, 2009. http://bura.brunel.ac.uk/handle/2438/3009.
Повний текст джерелаГулак, Сергій Олександрович. "Підвищення енергетичних показників електровозів змінного струму за рахунок адаптованої до системи електропостачання компенсації реактивної потужності". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2020. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48887.
Повний текст джерелаThesis for a Candidate Degree in Engineering (Doctor of Philosophy) in specialty 05.22.09 - "Electrotransport" 141 - Electric Power Engineering, Electrical Engineering and Electromechanics) - National Technical University "Kharkiv Polytechnic Institute", MES of Ukraine. Kharkiv, 2020. The dissertation is devoted to creation of scientific bases of a choice of optimum parameters and operating modes of system of compensation of reactive power on electric locomotives of alternating current. The factors that have the greatest impact on the quality of traction power supply from the side of the electric rolling stock of alternating current are analyzed. The factors that cause the greatest distortion of the voltage form of the catenary include the higher harmonic components, which are introduced into the traction power supply system by electric rolling stock. It is shown that such factors as poor current collection, passage of electric rolling stock of the feeder zone, the presence of several units of electric rolling stock in one feeder zone, modes of operation of electric rolling stock lead to the fact that the process of voltage change in the catenary is nondeterministic for the analysis of the spectral composition of the traction current of an electric locomotive, the application of classical Fourier transform methods is incorrect. The analysis of circuit solutions for the compensation of reactive power consumed by the electric rolling stock of alternating current showed that to date the most optimal solution is the use of hybrid reactive power compensators (НRPС). In such compensators, the passive part reduces the phase shift between the voltage of the secondary winding of the traction transformer and the traction current, the active part - removes the higher harmonic components of the traction current. The passive part of the НRPС is LC-filter, and the active stand-alone current inverter and control system of inverter. The control system of inverter performs spectral analysis of the traction current, forms an algorithm for the generation of autonomous inverter higher harmonics, the same amplitude but antiphase to the higher harmonics of the traction current. Existing control systems use Fourier transform methods to determine the spectral components of the traction current, but in real operating conditions of the electric rolling stock they are incorrect. It is proposed to apply the methods of correlation spectral analysis to determine the spectral components of the traction current. Mathematical and program-oriented models of operation of the traction and auxiliary drive of the AC electric locomotive (on the example of the VL-80k electric locomotive) were created. Distinctive features of these models are the ability to take into account the mutual influence of traction and auxiliary drives, as well as modes of operation of the electric locomotive. The method of calculating the parameters of induction motors with asymmetric stator windings has been improved. The relationship between parameters such as scattering inductance and mutual inductance with the geometric parameters of the windings is shown. This technique was used in the creation of a mathematical model of the drive of auxiliary machines, in particular for modeling the operation of the phase release. It is proposed to replace the phase release with an asymmetric voltage system that feeds the motor-fans to study the electrodynamic processes in the drives of auxiliary machines in steady-state operation. The mutual influence of the work of the traction drive and the drive of auxiliary machines is investigated. The results of the study allowed clarifying the spectral composition of the current in the circuits of traction and auxiliary drives. The elements of the passive and active parts of НRPС are calculated. A control system for the active part of the НRPС has been developed, the basis of which is a unit for determining the harmonic components of the traction current and removing zero and higher harmonic components from the current spectrum. A new approach to determining the spectral components of traction current is proposed. This approach is based on the application of the Levinson-Darbin linear prediction method. This approach allows to take into account the random nature of the voltage change at the current collector of the electric locomotive and, as a consequence, the traction current, and to adapt the operation of the compensator to the voltage parameters of the catenary. The application of this approach also allows taking into account such factors as the nature of the mode of operation of the electric locomotive, the passage of the boundaries of the catenary, and so on. The mathematical model of the traction drive when using НRPС is corrected, the amplitude-frequency and phase-frequency spectral characteristics of the voltage and current of the traction winding of the transformer are calculated and constructed. The power factor of the modernized traction drive is calculated. The use of a static converter instead of a phase breaker in the power supply system of auxiliary machines is substantiated. Mathematical modeling system of auxiliary drive of the electric locomotive is performed, amplitude-frequency and phase-frequency spectral characteristics of the voltage of the winding of the transformer's own winding and the current flowing in the winding of the own needs are calculated and constructed. The power factor of the modernized auxiliary drive is calculated. The losses of active and full power in the traction and auxiliary drives of the electric locomotive before and after the modernization are calculated. The dependences of factor efficiency and factor power of drives before and after modernization are calculated. The obtained results show that the factor efficiency of the traction drive after the application of the compensator decreased by 0,6%, and the power factor increased by 3,2%. The factor efficiency of the auxiliary drive after modernization increased by 1,5%, and the power factor - by 26,4%. The developed scientific provisions are an effective tool for modernization of the existing fleet of electric locomotives of the VL-80t and VL-80k series and the creation of a new electric rolling stock of railways. The results of the dissertation were implemented at the Scientific Research Design and Engineering Institute of Railway Transport of OJSC "Ukrzaliznytsya" (Kyiv), SE "Ukrainian Research Institute of Carriage" (Kremenchuk) and in the educational process of the State University of Infrastructure and Technology (Kyiv).
Xu, Ye. "Kilowatt Three-phase Rotary Transformer Design for Permanent Magnet DC Motor with On-rotor Drive System." Thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-27781.
Повний текст джерелаJain, Himanshu. "Dynamic Simulation of Power Systems using Three Phase Integrated Transmission and Distribution System Models: Case Study Comparisons with Traditional Analysis Methods." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/74234.
Повний текст джерелаPh. D.
Huang, Gang. "Compact physical models for power supply noise and chip/package co-design in gigascale integration (GSI) and three-dimensional (3-D) integration systems." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26619.
Повний текст джерелаCommittee Chair: Meindl, James D.; Committee Member: Bakir, Muhannad S.; Committee Member: Davis, Jeffrey A.; Committee Member: Gaylord, Thomas K.; Committee Member: Kohl, Paul A.; Committee Member: Naeemi, Azad. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Louganski, Konstantin P. "Modeling and Analysis of a Dc Power Distribution System in 21st Century Airlifters." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/35514.
Повний текст джерелаMaster of Science
Francis, Gerald. "An Algorithm and System for Measuring Impedance in D-Q Coordinates." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/26462.
Повний текст джерелаPh. D.
Zhong, Shan. "Measurement calibration/tuning & topology processing in power system state estimation." Texas A&M University, 2003. http://hdl.handle.net/1969.1/1595.
Повний текст джерелаHord, Kyle A. "MODELING AND VALIDATION OF A SYNCHRONOUS-MACHINE/CONTROLLED-RECTIFIER SYSTEM." UKnowledge, 2014. http://uknowledge.uky.edu/ece_etds/42.
Повний текст джерелаRojas, Lobos Felix Eduardo [Verfasser], Ralph [Akademischer Betreuer] [Gutachter] Kennel, and Jon [Gutachter] Clare. "A High Performance Power Supply based on a Four-Leg Three-Level NPC Converter for Non-linear and Unbalanced Systems / Felix Eduardo Rojas Lobos. Betreuer: Ralph Kennel. Gutachter: Ralph Kennel ; Jon Clare." München : Universitätsbibliothek der TU München, 2016. http://d-nb.info/1111038929/34.
Повний текст джерелаVápeník, René. "Modelování nesymetrického třífázového vedení." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218010.
Повний текст джерелаCarvalho, Hamilton Dias de. "Avaliação de desempenho do gerador de indução trifásico assimétrico conectado a uma rede monofásica - aplicações rurais." Universidade Federal de Uberlândia, 2006. https://repositorio.ufu.br/handle/123456789/14635.
Повний текст джерелаThis work has for motive to obtain the project and build of an assymmetrical three-phase induction generator connected to single-phase supply system, in order to be used in rural areas. This equipment has been presented as a better alternative in relation the others proposed more commercialized at the moment, due to its robustness, low cost, less maintenance requirements and excellent performance. Firstly, in the theoric part concerned to the system it is presented a mathematical representation, frequency domain mathematical model, whose equations are performed in function of an unbalance factor in order to obtain balance three-phase voltages in the system. Then, some simulations are performed in the simulator that was developed in the Microsoft Excel program. From these implements, it is carried out study cases to prove the assymmetrical three-phase induction generator use potentialities. A prototype is projected and built, which experimental results are compared to the computer result.
O objetivo deste trabalho é obter o projeto e a construção de um gerador de indução trifásico assimétrico conectado a um sistema de distribuição de energia elétrica monofásica; visando aplicá-lo em áreas rurais. Este dispositivo, em face de sua robustez, baixo custo, menores requisitos de manutenção e bom desempenho, consiste numa alternativa bastante atrativa em relação às outras propostas existentes atualmente. O estudo teórico inicia-se através da elaboração de uma modelagem matemática para o sistema, no domínio da freqüência, cujas equações são colocadas em função de um fator indicativo do nível de desbalanceamento, visando à obtenção de tensões balanceadas na carga. Para tanto, a modelagem matemática elaborada é implementada num simulador desenvolvido no programa Microsoft Excel. A partir desta implementação, são efetuados estudos de casos no sentido de evidenciar as potencialidades do gerador assimétrico conectado a cargas rurais. Os trabalhos computacionais são devidamente validados à luz de resultados experimentais extraídos de um protótipo de equipamento concebido, projetado e construído para fins deste trabalho.
Mestre em Ciências
Holub, Ondřej. "Proaktivní diagnostika a monitorování stavu trojfázových asynchronních motorů v průmyslovém podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241220.
Повний текст джерелаLeplus, François. "Sur la modélisation numérique des transformateurs monophasé et triphasé : Application aux montages redresseurs et gradateurs." Lille 1, 1989. http://www.theses.fr/1989LIL10073.
Повний текст джерелаChang, Tsuen-Ding, and 張村叮. "Implementation of Three-Phase Fed DC Power Supply System with High Power Factor." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/x27zfm.
Повний текст джерела中原大學
電機工程研究所
93
In this thesis, a high efficiency power supply system with high power factor is proposed for high power applications. The studied power supply system consists with a three-phase three-switch power factor corrector (PFC) and a phase-shifted zero-voltage-transition full-bridge DC/DC converter with current doubler rectification. High power factor input can be achieved by the adopted PFC circuit with a simple configuration. The phase-shifted operation of the full-bridge DC/DC converter provides the zero-voltage-switching (ZVS) features for the bridge switches to reduce the switching losses effectively. The current doubler rectification reduces significantly the secondary rectification losses. Therefore, high efficiency can be also accomplished. The detailed operating principle and design consideration of this power supply system are analyzed and described. A 1.1kW 55V/20A laboratory prototype was implemented and tested. The experimental waveforms verify the feasibility of the proposed design. The implemented power supply system exhibits optimum performances such as high power factor, high efficiency, simple configuration and high reliability.
Wu, Wen-Chieh, and 巫文傑. "Simulation of Integrated Three-phase AC/DC Power Supply System of MRTS." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/57903918357180689620.
Повний текст джерела國立臺灣科技大學
電機工程系
88
The major purpose of this thesis is to apply a commercial circuit simulation software, Intusoft ICAP/4, to simulate the operation property of a three-phase AC/DC power supply system of the MRTS under normal and abnormal conditions, and based on the maximal DC traction demand and the electric demand of stations. The disadvantages of conventional approaches that separate the calculations of AC and DC networks and the necessary of setting the control variables of the AC/DC converters are avoided in the proposed method. First of all, the mathematical models of the major facilities of the AC/DC power supply systems of the MRTS were introduced. These equivalent circuit models were implemented by the Intusoft IsSpice. After the model of a simple converter bank was implemented. The effects of source voltage unbalance and harmonic pollution on the rectifier were evaluated. Finally, the full-scale model of the AC/DC network of the Panchiao-Nankang line of Taipei MRTS was implemented and simulated by the IsSpice. The voltage profiles, power flows and harmonics on both AC and DC networks can be obtained in a single run. The simulation results have verified the correctness and feasibility of the proposed method.
Wang, Kuo-Cheng, and 王國丞. "Design and Implementation of Parallel Type Three-phase Uninterruptible Power Supply Systems." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/56638494191890576260.
Повний текст джерела國立臺灣科技大學
電機工程系
95
This thesis is concerned with the design of three-phase expandable parallel multi-functional uninterruptible power supply (UPS) systems. The system communication is conducted by controller area network (CAN). When the AC mains is normal, the proposed system provides compensating reactive power using current-controlled mode. Whereas, if the AC mains fails, the system will supply the battery power to the load with master/slave control. The master UPS operates under voltage-controlled mode, while all the other converters function under current-controlled mode. If the UPS under voltage-controlled mode fails, one of the UPS under current-controlled mode will be changed to voltage-controlled mode to provide stable AC voltage. Thus, each UPS can either provide AC voltage source independently, or be connected with others in parallel for capacity expansion. The control scheme of the system is implemented by a 16-bit digital signal processor to reduce the hardware components. The experimental results for 1030 W linear resistive load show that the total harmonic distortion of output voltage is 1.32 %. Each UPS can share current and output power evenly.
Chang, Hsiu Wei, and 張修維. "Design and Implementation of Rotary-Type Three-Phase Uninterruptible Power Supply Systems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/51100769214788849609.
Повний текст джерела國立臺灣科技大學
電機工程系
96
This thesis is concerned with the design and implementation of rotary-type, three-phase uninterruptible power supply (UPS) systems. In this system, a permanent-magnet synchronous motor is used to drive an excited-type synchronous generator to generate three-phase electrical power to loads. The full-bridge diode rectifier is used to convert the utility to dc source for inverter to drive the permanent-magnet synchronous motor. Besides, batteries can release energy when utility fails to assure the supply of dc source voltage. The current control method of synchronous frame with closed-loop speed control mechanism is used to maintain constant motor speed. On the other hand, the dc chopper in accordance with the feedback of three-phase voltage is designed to adjust the exciting current for synchronous generator, and thereby outputs the three-phase electrical power with constant-voltage and constant-frequency. A high-performance, low-cost, 16-bit digital signal processor (DSP, TMS320LF2407A) is used as the control core. The control of motor and inverter is accomplished by software for reducing the circuit complexity. A prototype of 600W synchronous motor with speed control system is developed. Finally, experiments are given to justify the feasibility of the proposed system.
Yang, Jiou-Meng, and 楊久孟. "Development of Three-Phase Parallel Uninterruptible Power Supply Systems with the Function of Reactive Power Compensator." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/53614840266661310485.
Повний текст джерела國立臺灣科技大學
電機工程系
93
This thesis is concerned with the implementation of three-phase parallel multi-functional uninterruptible power supply systems. The system consists of two three-phase three-leg parallel converters. When the AC mains is normal, the proposed system regulates its output current according to the AC load, and achieves compensating reactive power, reducing voltage regulation and charging battery. If the AC mains fails, the system will supply the battery power to the load with master/slave control. The first dc-to-ac power converter with double control loops provides stable AC voltage source with low harmonic distortion, whereas the second converter operates under current-controlled mode to provide harmonic compensation current or share load current based on different loads to improve system capacity. As to the management of batteries, the charging/discharging schemes are fulfilled by a boost/buck DC chopper. The performance of the system is first simulated with MATLAB/Simulink. The control scheme of the system is implemented by a 16-bit digital signal processor (DSP, TMS320LF2407A) to reduce the hardware components. The experimental results for 1380 W linear resitive load and 1030 W nonlinear load show that the total harmonic distortions of output voltage are 1.4 % and 5.5 %, respectively. Besides, the proposed system can yield power compensation for the inductive load of 630 W and 640 VAR under normal utility operation. Experimental and simulated data are given to justify the analysis.
Li, Yu-wei, and 李昱葳. "Photovoltaic Power Supply System with Three-stage Energy Management and Maximum Power Point Tracking under Partially Shaded Conditions." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/41135901828485335429.
Повний текст джерела國立臺灣科技大學
電子工程系
100
In recent years, because environmental pollution and fossil energy will be run out soon, renewable energies are becoming the focus of the development worldwide. Among them, solar energy is the most attractive. The advantages of the solar energy are quiet, clean and inexhaustible. This thesis aims to study and implement a photovoltaic power supply system with three-stage energy management and maximum power point tracking (MPPT) capability under partially shaded conditions. The three-stage energy management can increase the utilization of solar panels, and raise system stability. A modified P&O MPPT method is also realized to overcome the problems due to solar shading effect. The operating principles and design considerations of the studied photovoltaic system are analyzed and discussed in details. A 2-kW laboratory prototype was implemented and tested. The experimental results are shown to verify the feasibility of the proposed scheme.