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1
Chapman, Jeffrey W. (Jeffrey Wayne). "Feedback linearizing generator excitation control for enhanced power system stability." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/117237.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.<br>Title as it appears in the M.I.T. Graduate List, June 1992: Nonlinear control strategies for power system stability enhancement.<br>Includes bibliographical references (leaves 104-107).<br>by Jeffrey W. Chapman.<br>M.S.
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Bati, A. F. "The operation of small synchronous generators with particular reference to the excitation system control." Thesis, Cranfield University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233421.
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Bladh, Johan. "Hydropower generator and power system interaction." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-182188.
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After decades of routine operation, the hydropower industry faces new challenges. Large-scale integration of other renewable sources of generation in the power system accentuates the role of hydropower as a regulating resource. At the same time, an extensive reinvestment programme has commenced where many old components and apparatus are being refurbished or replaced. Introduction of new technical solutions in existing power plants requires good systems knowledge and careful consideration. Important tools for research, development and analysis are suitable mathematical models, numerical simulation methods and laboratory equipment. This doctoral thesis is devoted to studies of the electromechanical interaction between hydropower units and the power system. The work encompasses development of mathematical models, empirical methods for system identification, as well as numerical and experimental studies of hydropower generator and power system interaction. Two generator modelling approaches are explored: one based on electromagnetic field theory and the finite element method, and one based on equivalent electric circuits. The finite element model is adapted for single-machine infinite-bus simulations by the addition of a network equivalent, a mechanical equation and a voltage regulator. Transient simulations using both finite element and equivalent circuit models indicate that the finite element model typically overestimates the synchronising and damping properties of the machine. Identification of model parameters is performed both numerically and experimentally. A complete set of equivalent circuit parameters is identified through finite element simulation of standard empirical test methods. Another machine model is identified experimentally through frequency response analysis. An extension to the well-known standstill frequency response (SSFR) test is explored, which involves measurement and analysis of damper winding quantities. The test is found to produce models that are suitable for transient power system analysis. Both experimental and numerical studies show that low resistance of the damper winding interpole connections are vital to achieve high attenuation of rotor angle oscillations. Hydropower generator and power system interaction is also studied experimentally during a full-scale startup test of the Nordic power system, where multiple synchronised data acquisition devices are used for measurement of both electrical and mechanical quantities. Observation of a subsynchronous power oscillation leads to an investigation of the torsional stability of hydropower units. In accordance with previous studies, hydropower units are found to be mechanically resilient to subsynchronous power oscillations. However, like any other generating unit, they are dependent on sufficient electrical and mechanical damping. Two experimentally obtained hydraulic damping coefficients for a large Francis turbine runner are presented in the thesis.
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Tibebu, Eyuel. "An automatic voltage regulating system with Bluetooth communicating devices for brushless excitation of a synchronous generator." Thesis, Uppsala universitet, Elektricitetslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-202587.
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This thesis has been performed in order to earn a master's degree in electrical engineering. The task was to implement an automatic voltage regulator, AVR, to control the terminal voltage of the synchronous generator Svante at the Division of Electricity at Uppsala University. The AVR uses Bluetooth technology to transfer a control signal produced by a programmable logical controller, PLC, to phase- mounted SSRs that decides what proportion of the AC from a six-phase brushless exciter that is to be used for the magnetization of the rotor. Test runs of the AVR were preformed with a regulator optimized according to the Ziegler-Nichols method and a static exciter that uses brushes and slip rings to apply voltage to the rotor winding. The results obtained complies with the assigned requirements set for this thesis and the AVR. The primary focus of this thesis mainly lies in the construction of the control system, which include the programming of both PLC and Bluetooth communicating devices.
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Ivanic, Boris. "AVR for a synchronous generator with a six-phase PM alternator and rotating excitation system." Thesis, Uppsala universitet, Elektricitetslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-201997.
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Automatic voltage regulation is necessary for all power producing synchronous generators to ensure that the produced power have a constant and stable voltage level and to sustain grid stability. The aim of this thesis is to design and build an automatic voltage regulator for a synchronous generator. A six-phase permanent magnet alternator will be used to excite the rotor with solid-state relay controlled rotating bridge rectifier. The field current is regulated by a closed loop control system that is based on a programmable logic controller, PLC. Programing of the PLC is executed in the developing environment CoDeSys, IEC 61131-3, which is the international standard for programing PLC applications. Simulations for predicting the system behavior is done with a web based in-browser tool, circuitlab.com. The results show a good performance of the regulator and the closed loop system although there is room for improvement of the solid-state controlled rectifier system.
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Pålsson, Emma. "Vibration analysis of a fast response brushless excitation system." Thesis, Uppsala universitet, Elektricitetslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-394098.
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The aim of this study is to measure and analyze vibrations on a fast response brushless exciter (FRBE) at a real hydropower plant and identify vibration origins through frequency analysis. Moreover, the observed vibrations are evaluated in relation to generator vibration standards and estimated tangential eigenfrequencies of the studied FRBE. It is concluded that the pulsations in the air gap torque, originating from the rotating thyristor bridge rectifier, is the source of the strongest vibrations. Some additional vibration sources are also identified. The requirements of the generator vibration standards are mostly fulfilled and no tangential eigenfrequencies are triggered in the vibration recordings. For further studies it is recommended that alternative control strategies and optimization of the FRBE mechanical design, with respect to its ability to withstand vibrations, should be investigated.
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Larsson, Rickard, and Kenny Andersson. "Construction, testing and verification of a brushless excitation system with wireless control of the field current in a synchronous generator." Thesis, Uppsala universitet, Elektricitetslära, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-341021.
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Synchronous generators have been used in hydropower from more than a century where, traditionally, the field current is transferred to the rotor using slip rings and carbon brushes. There are some major disadvantages following the use static excitation; regular and expensive maintenance, as well as a source of carbon dust which, due to buildup, may cause short circuits. To avoid these problems associated with slip ring exciter systems, a system that use induction to transfer power to the rotor could be used instead. Systems that utilize brushless excitation today usually regulates the current by controlling the magnetization of the exciter stator, which is comparably slower than their static counterparts. In order to allow for swift regulation of the field current from a brushless exciter, required power electronics and controllers have to be present on the rotor shaft instead. The aim of this project is to start investigating if commercially available products, which are originally indented to be used in a stationary environment, could accomplish this. The results from this study shows that it is possible to use such products to control the field current. The components were found to withstand the exposure of high g-forces and vibrations, albeit only during the relatively small amount of time in which rotary testing was performed. As such there is no certainty that the components would remain functional for the considerably longer time that any commercial use would require them to.
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Resener, Mariana. "Avaliação do impacto dos controladores de excitação na estabilidade transitória de geradores síncronos conectados em sistemas de distribuição." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2011. http://hdl.handle.net/10183/31412.
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A conexão de geradores em sistemas de distribuição, usualmente chamados de geradores distribuídos, traz novos aspectos técnicos que devem ser analisados pelas empresas distribuidoras, uma vez que os dispositivos de proteção e controle, bem como as técnicas de planejamento e otimização da operação destes sistemas consideram um sistema radial, ou seja, sem a presença de geradores. Em se tratando de geradores síncronos, sabe-se que os sistemas de excitação podem ser equipados com meios para o ajuste automático de tensão, potência reativa ou fator de potência, sendo que três diferentes modos de controle podem ser aplicados a geradores síncronos: regulação de tensão, regulação de potência reativa ou fator de potência e controle de potência reativa ou fator de potência. Ainda, sabe-se que não há um consenso entre as empresas distribuidoras de energia sobre qual o melhor modo de controle destas máquinas, e na maioria dos casos a estratégia de controle de excitação é definida através de um acordo operativo entre a empresa de distribuição de energia e o produtor independente ou autoprodutor que opera o gerador distribuído. Neste contexto, esta dissertação de mestrado tem como objetivo apresentar contribuições com relação à avaliação da estabilidade transitória de geradores síncronos conectados em sistemas de distribuição, avaliando o impacto que os diferentes modos de controle de excitação podem ocasionar, em diferentes condições de operação do sistema. Como parâmetro principal de análise tem-se o tempo crítico de eliminação de falta, obtido através de exaustivas simulações dinâmicas utilizando dados de um sistema real e considerando diferentes condições de operação do sistema, sendo estas: diferentes modos de controle da geração distribuída, modificação do ganho proporcional do controlador de fator de potência, diferentes pontos de operação da geração distribuída, diferentes cenários de carregamento do sistema e diferentes potências de geração.<br>The connection of generators in distribution systems, commonly called distributed generation, brings new technical issues that must be analyzed by the utilities, since protection and control devices, as well as techniques for system planning and operation optimizing consider radial systems, i.e. without the presence of generators. In the case of synchronous generators, it is known that the excitation systems can be equipped with means for automatic adjustment of voltage, reactive power or power factor, and three different control modes can be applied to synchronous generators: voltage regulation, reactive power or power factor regulation and reactive power or power factor control. It is also known that there is no consensus among the power distribution companies about which is the best control mode for use in these machines, and in most cases the excitation control strategy is defined by an operating agreement between the company and the energy producer that operates the distributed generator. In this context, this work aims to provide contributions about the transient stability of synchronous generators connected to distribution systems, evaluating the impacts that different control modes may result in different system operating conditions. The main analysis parameter is the critical clearing fault time, obtained through extensive simulations using real system data. The different system operating conditions considered in the simulations are: different control modes, variation of the power factor controller proportional gain, different operating points of the distributed generation, different system loadings and power generation.
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Mseddi, Amina. "Modélisation et commande d’un générateur éolien à double excitation isolé en vue de l’amélioration de son rendement et de la diminution de la fatigue mécanique." Thesis, Cergy-Pontoise, 2019. http://www.theses.fr/2019CERG1032.
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Le présent sujet contribue à la modélisation et à la commande de systèmes de conversion éoliens basés sur un Générateur Synchrone à Double Excitation (GSDE). Le degré de liberté apporté par l’excitation bobinée offre la possibilité de travailler sur l’amélioration de l’efficacité énergétique sur les cycles de fonctionnement avec sollicitations aléatoires, comme dans le cas de l’éolien.On vise, à travers cette recherche, la mise en place de techniques de commande robuste d’un GSDE en vue de l’optimisation de son rendement aérodynamique et de la réduction de la fatigue mécanique. Dans ce contexte, un générateur hybride relié à une charge isolée pour des applications éoliennes est présenté. Des modèles linéaires sont tout d’abord établis. Ces modèles sont ensuite utilisés pour mettre en place les structures de contrôle appropriées tant du point de vue électrique que mécanique. Parallèlement, des modèles non linéaires très complets sont développés permettant une validation en simulation très poussée prenant en compte les harmoniques d’espace du générateur, les effets de commutation des convertisseurs et les effets de torsion sur l’arbre. En outre, un émulateur éolien de 3 kW est construit, en vue d'évaluer expérimentalement l’apport de notre générateur hybride dans le domaine éolien puis d'améliorer les contrôleurs synthétisés. Dans ce travail, deux stratégies de contrôle robuste pour une machine hybride sont implémentées et une comparaison entre un contrôleur CRONE et un contrôleur H∞ est établie. Des résultats très satisfaisants sont obtenus avec une meilleure performance du CRONE par rapport au H∞. Outre la problématique de l’optimisation de la production du système de conversion éolien, on a aussi cherché à réduire le taux d’harmonique en recourant à deux solutions : le filtrage passif et la réduction des ondulations du couple électromagnétique par action sur le courant d’excitation. Bien qu’on ait apporté des améliorations pour de grandes vitesses de rotation de la génératrice, ces solutions restent insuffisantes pour une connexion de l’architecture proposée au réseau électrique...Une fois l’applicabilité de la GSDE dans le domaine éolien prouvée pour le cas d’un système éolien de 3 kW, nous sommes passé à une puissance plus réaliste en interfaçant notre modèle électrique avancé avec un modèle aéroélastique, disponible sur le logiciel FAST. Ce dernier permet de prendre en compte les éléments mécaniques, les couplages et les éventuelles flexibilités. La turbine choisie pour l’étude est la turbine WindPACT de puissance 1.5MW. Dans cette partie, des commandes robustes traitant la réduction de la fatigue mécanique sont élaborées.Le modèle de la turbine WindPACT basé sur le générateur hybride est finalement connecté au réseau, les lois de commande nécessaires pour cette connexion sont implémentées puis validées sous la plateforme Matlab Simulink<br>This subject contributes to the modeling and control of a wind conversion system based on a Double Excitation Synchronous Generator (DESG). The degree of freedom provided by the wound excitation allows the improvement of the energy efficiency on the operation’s cycles with random solicitations, as it is the case for wind turbines.The aim of this research is to implement robust control techniques for the DESG in order to optimize its aerodynamic efficiency and to reduce its mechanical loads. In this context, a hybrid generator connected to an isolated load for wind applications is presented. First, linear models are established. These models are used to set up the appropriate control structures from both an electrical and mechanical point of view. At the same time, very complete nonlinear models are developed allowing a validation in an advanced simulation platform taking into account the space harmonics of the generator, the switching effects of the converters and the torsional effects on the shaft. Moreover, a 3 kW wind emulator is built to evaluate the contribution of the hybrid generator in the wind conversion systems field and then improve the synthesized controllers. Two robust control strategies for a hybrid machine are implemented and a comparison between a CRONE controller and a H∞ controller is presented. Satisfying results are obtained with a better performance for the CRONE regulator compared to H∞ one. In addition to the problem of optimizing the production of the wind energy conversion system, attempts have also been made to reduce the generator harmonic distortion ratios by using two solutions: passive filtering and reduction of the electromagnetic torque ripple by acting on the excitation current. Although there are improvements at high rotation speeds, these solutions are not sufficient for a connection of the proposed architecture to the grid.Once the applicability of the DESG in the wind energy field has been proven in the case of a 3 kW wind conversion system, we have considered a more realistic case. To this end, we have interfaced the developed advanced electric model with an aeroelastic model available on the FAST software, to take into account the mechanical couplings and the flexibilities. The turbine chosen for the study is the WindPACT 1.5MW turbine. In this part, robust controllers dealing with the reduction of mechanical fatigue are developed.The model of WindPACT turbine based on the hybrid generator is finally connected to the grid and the control laws necessary for this connection are implemented and validated under the Matlab Simulink platform
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Nøland, Jonas Kristiansen. "A New Paradigm for Large Brushless Hydrogenerators : Advantages Beyond the Static System." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-317780.
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The grid code, FIKS, from the Norwegian transmission system operator (TSO), Statnett, states that synchronous generators > 25MVA, must have a static excitation system. However, an improved brushless excitation system is in operation on some commercial power plants (36MVA, 93.75rpm & 52MVA, 166.67rpm) with grid-assisting performance beyond the conventional static system. The convenional diode bridge is replaced with a remote-controlled thyristor bridge on the shaft. If wireless communication is not allowed, a control signal through brushes should be employed instead. The thesis explores the expected new era for large brushless hydrogenerators. The proposed brushless system have benefits of reduced regular maintenance due to elimination of brushes and reduced unscheduled maintenance due to redundancy; causing a redused cost-of-energy. A six-phase exciter design with a hybrid-mode thyristor bridge interface leads to improved fault-tolerance, better controllability, minimized torque pulsations and reduced armature currents of the exciter. Excitation boosting (EB) capability is included in the brushless system without additional components or circuitry, contrary to the static excitation system. The brushless excitation system is made insensitive to voltage dips in the interconnected grid, causing improved fault ride-through (FRT) capability and power system stabilizer (PSS) actions.
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Skurka, Tomáš. "Návrh rotujícího usměrňovače pro synchronní generátor." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377049.
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This diploma thesis is focused on the design of a rotating rectifier for a synchronous generator. Based on defined requirements, the new rotating rectifier concept has been created that allows a greater current range than existing rectifier used by Siemens Electric Machines s.r.o. The thesis is divided into five parts. The first part deals with the search of existing rotating rectifiers and other design possibilities. The requirements for the rotating rectifier were defined in the second part of the thesis. The following section deals with both electrical design of rectifier elements and varistors. The fourth part of the diploma thesis describes the thermal analysis. On the basis of thermal analysis the operating conditions of the rotating rectifier were determined. The last part of the thesis is devoted to mechanical and modal analysis. Based on these analyses, the strength and operability of the new rotating rectifier concept were verified.
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Omoigui, M. O. "An investigation into stability improvement through interlinking excitation systems of synchronous generators." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377668.
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Alves, Guilherme Henrique. "Uma proposta de regulador automático de tensão microcontrolado para geradores síncronos isolados." Universidade Federal de Uberlândia, 2016. https://repositorio.ufu.br/handle/123456789/17931.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Os sistemas de controle de excitação em máquinas síncronas devem detectar com
bastante rapidez as mudanças causadas pela entrada de carga no gerador isolado e atuar no
sistema de excitação de forma rápida e eficiente, para manter a tensão terminal em níveis
desejados. Ao contrário de outros trabalhos realizados nesta área com circuitos eletrônicos
analógicos, em muitos casos, este controlador pode ser construído utilizando tecnologia
microcontrolada por possuir alto nível de eficiência no controle, circuito com flexibilidade para
implementação de diferentes estratégias de controle e baixo custo para produção.
A abordagem deste trabalho consiste em uma proposta para aplicação de um controle
de excitação automático utilizando uma malha PID, com opções de controle manual,
monitoramento de tensão terminal e temperatura de estator da máquina, utilizando um
microcontrolador PIC16F877A da empresa Microchip Technology.
Os resultados obtidos a partir de ensaios práticos em laboratório com partidas diretas de
motores de indução (1 e 2 cv) com um gerador de 2 kVA mostra que a atuação do controlador
recuperou a tensão terminal em pouco tempo, para o setpoint adotado.
E por fim, os resultados obtidos foram comparados com os tempos de resposta de outro
conhecido regulador automático de tensão encontrado no mercado, para comprovar o bom
desempenho de controle deste projeto.<br>The excitation control systems in synchronous machines must very quickly detect
changes caused by load increase on the isolated generator and act on the excitation system in a
rapid and efficient way in order to maintain terminal voltage at optimal desired levels. Unlike
other works related with this area which used analog-based electronic circuits, this controller
can in many case be built utilizing microcontrolled technology which is more efficient and
flexible to implement different control strategies, as well as having a low cost of production.
The approach of this research consists in a proposal to apply an automatic excitation
controller, utilizing a PID control loop, including manual adjustments and monitorings of
terminal voltage and stator temperature of the machine. It employs a PIC16F877A
microcontroller from the Microchip Technology Company.
The results obtained through practical tests in laboratory with a direct online start of
induction motors (1 and 2 HP) on a 2 kVA generator show that the controller acts to recover
the terminal voltage to the adopted setpoint in a reduced time.
Finally, the results were also compared to the time of response provided from another
well-known automatic voltage regulator found in the market, in order to prove the good control
performance of this project.<br>Dissertação (Mestrado)
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Young, Derek W. G. "Design, simulation and practical implementation of optimal excitation controllers for synchronous generators." Thesis, University of Aberdeen, 1987. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU010652.
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This thesis describes the design of multivariable excitation controllers for synchronous generators, and their practical implementation on a laboratory machine system. The main objectives of the investigation were aimed at extending the steady-state stability limit of the generator and improving its general controllability. The present work is principally concerned with the implementation and test of the designs. Instrumentation has been developed to measure and combine feedback signals; this instrumentation and the laboratory generator system are described in detail. The performances of the controllers are predicted by computer simulation and evaluated by practical testing; attention is focussed on comparison of predicted and experimental performances. The theoretical basis of the design strategy is described, in which an optimal control algorithm applies the system states as feedback signals to the open-loop system, thereby shifting certain of the system eigenvalues to more desirable, predetermined locations. The state variables are selected as physically measurable quantities which obviates the need for implementing state estimation techniques.
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Qunais, Thaer. "Parametric Average-Value Model of Rectifiers in Brushless Excitation Systems." UKnowledge, 2013. http://uknowledge.uky.edu/ece_etds/37.
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An average-value model of a rotating rectifier circuit in a brushless excitation system is set forth, where a detailed simulation is required to extract the essential averaged-model parameters using numerical averaging. In the proposed approach, a synchronous machine model with saturation and cross saturation and an arbitrary rotor network representation that uses a voltage-behind-reactance representation for the field winding of the main machine is proposed. This allows the field winding to be represented as branches in a circuit solver, permitting straightforward simulation with connected circuitry. Also a brushless exciter model is introduced to be compatible with the averaged-model, where the exciter armature windings are represented using a voltage-behind-reactance formulation. The resulting average-value model is verified in time domain against detailed simulation, and its validity is demonstrated in all rectifier modes of operation.
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Schmitz, Michael J. "Multisine Excitation Design to Increase the Efficiency of System Identification Signal Generation and Analysis." Diss., North Dakota State University, 2012. https://hdl.handle.net/10365/26701.
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Reducing sample frequencies in measurement systems can save power, but reduction to the point of undersampling results in aliasing and possible signal distortion. Nonlinearities of the system under test can also lead to distortions prior to measurement. In this dissertation, a first algorithm is presented for designing multisine excitation signals that can be undersampled without distortion from the aliasing of excitation frequencies or select harmonics. Next, a second algorithm is presented for designing undersampled distributions that approximate target frequency distributions. Results for pseudo-logarithmically-spaced frequency distributions designed for undersampling without distortion from select harmonics show a considerable decrease in the required sampling frequency and an improvement in the discrete Fourier transform (DFT) bin utilization compared to similar Nyquist-sampled output signals. Specifically, DFT bin utilization is shown to improve by eleven-fold when the second algorithm is applied to a 25 tone target logarithmic-spaced frequency distribution that can be applied to a nonlinear system with 2nd and 3rd order harmonics without resulting in distortion of the excitation frequencies at the system output. This dissertation also presents a method for optimizing the generation of multisine excitation signals to allow for significant simplifications in hardware. The proposed algorithm demonstrates that a summation of square waves can sufficiently approximate a target multisine frequency distribution while simultaneously optimizing the frequency distribution to prevent corruption from some non-fundamental harmonic frequencies. Furthermore, a technique for improving the crest factor of a multisine signal composed of square waves shows superior results compared to random phase optimization, even when the set of obtainable signal phases is restricted to a limited set to further reduce hardware complexity.
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Nøland, Jonas Kristiansen. "Fast-response rotating brushless exciters for improved stability of synchronous generators." Licentiate thesis, Uppsala universitet, Elektricitetslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-292835.
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The Norwegian Network Code FIKS from the Norwegian Transmission System Operator (TSO) Statnett, states that synchronous generators ≥ 25 MVA must have a static excitation system. It also includes requirements on the step time response and the available field winding ceiling voltage of the excitation system. An improved brushless excitation system is in operation in some pilot power plants. A rotating thyristor bridge is controlled via Bluetooth. The step time response is as fast as conventional static excitation systems. However, a ceiling voltage factor of 2 requires the thyristor bridge to operate at firing angles about 60 degrees. High torque pulsations, low power factor and low utilization of the exciter is the end result. New power electronic interfaces on the shaft results in a betterutilization of the designed exciter and improves the mechanical performance as well as the controllability of the generator field winding. Permanent magnet rotating exciters increase the field forcing strength of the synchronous generator, yielding improved transient stability (Fault Ride-Through req.). Brushless exciters also reduces regular maintenance of the generator. The thesis includes experiments on a state of the art synchronous generator test setup including constructed PM exciter and different power electronic solutions. Some investigations has been done on industrial power plants as well.
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Joós, Géza. "The nature of torsional interactions in synchronous generators /." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74033.
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Sattouf, Mousa. "Systém snímání dat a ovládání vodní elektrárny prostřednictvím internetové techniky." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-233685.
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Vodní energie se nyní stala nejlepším zdrojem elektrické energie na zemi. Vyrábí se pomocí energie poskytované pohybem nebo pádem vody. Historie dokazuje, že náklady na tuto elektrickou energii zůstávají konstantní v průběhu celého roku. Vzhledem k mnoha výhodám, většina zemí nyní využívá vodní energie jako hlavní zdroj pro výrobu elektrické energie.Nejdůležitější výhodou je, že vodní energie je zelená energie, což znamená, že žádné vzdušné nebo vodní znečišťující látky nejsou vyráběny, také žádné skleníkové plyny jako oxid uhličitý nejsou vyráběny, což činí tento zdroj energie šetrný k životnímu prostředí. A tak brání nebezpečí globálního oteplování. Použití internetové techniky k ovladání několika vodních elektráren má velmi významné výhody, jako snížení provozních nákladů a flexibilitu uspokojení změny poptávky po energii na straně spotřeby. Také velmi efektivně čelí velkým narušením elektrické sítě, jako je například přidání nebo odebrání velké zátěže, a poruch. Na druhou stranu, systém získávání dat poskytuje velmi užitečné informace pro typické i vědecké analýzy, jako jsou ekonomické náklady, predikce poruchy systémů, predikce poptávky, plány údržby, systémů pro podporu rozhodování a mnoho dalších výhod. Tato práce popisuje všeobecný model, který může být použit k simulaci pro sběr dat a kontrolní systémy pro vodní elektrárny v prostředí Matlab / Simulink a TrueTime Simulink knihovnu. Uvažovaná elektrárna sestává z vodní turbíny připojené k synchronnímu generátoru s budicí soustavou, generátor je připojen k veřejné elektrické síti. Simulací vodní turbíny a synchronního generátoru lze provést pomocí různých simulačních nástrojů. V této práci je upřednostňován SIMULINK / MATLAB před jinými nástroji k modelování dynamik vodní turbíny a synchronního stroje. Program s prostředím MATLAB SIMULINK využívá k řešení schematický model vodní elektrárny sestavený ze základních funkčních bloků. Tento přístup je pedagogicky lepší než komplikované kódy jiných softwarových programů. Knihovna programu Simulink obsahuje funkční bloky, které mohou být spojovány, upravovány a modelovány. K vytvoření a simulování internetových a Real Time systémů je možné použít bud‘ knihovnu simulinku Real-Time nebo TRUETIME, v práci byla použita knihovna TRUETIME.
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Rosado, Sebastian Pedro. "Voltage Stability and Control in Autonomous Electric Power Systems with Variable Frequency." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/29616.
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This work focuses on the safe and stable operation of an autonomous power system interconnecting an AC source with various types of power electronic loads. The stability of these systems is a challenge due to the inherent nonlinearity of the circuits involved. Traditionally, the stability analysis in this type of power systems has been approached by means of small-signal methodology derived from the Nyquist stability criterion. The small-signal analysis combined with physical insight and the adoption of safety margins is sufficient, in many cases, to achieve a stable operation with an acceptable system performance. Nonetheless, in many cases, the margins adopted result in conservative measures and consequent system over designs.
This work studies the system stability under large-perturbations by means of three different tools, namely parameter space mapping, energy functions, and time domain simulations. The developed parameters space mapping determines the region of the state and parameter space where the system operation is locally stable. In this way stability margins in terms of physical parameters can be established. Moreover, the boundaries of the identified stability region represent bifurcations of the system where typical nonlinear behavior appears. The second approach, based on the Lyapunov direct method, attempts to determine the region of attraction of an equilibrium point, defined by an operation condition. For this a Lyapunov function based on linear matrix inequalities was constructed and tested on a simplified autonomous system model. In Addition, the third approach simulates the system behavior on a computer using a detailed system model. The higher level of model detail allows identifying unstable behavior difficult to observe when simpler models are used.
Because the stability of the autonomous power system is strongly associated with the characteristics of the energy source, an improved voltage controller for the generator is also presented. The generator of an autonomous power system must provide a good performance under a wide variety of regimes. Under these conditions a model based controller is a good solution because it naturally adapts to the changing requirements. To this extent a controller based on the model of a variable frequency synchronous generator has been developed and tested. The results obtained show a considerable improvement performance when compared to previous practices.<br>Ph. D.
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Carlsson, Johannes, and Erik Andersson. "Affektiva skillnader i mänskligt komponerad- och procedurellt genererad affektiv musik : En studie om den generativa musikens potential." Thesis, Högskolan i Skövde, Institutionen för informationsteknologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-19962.
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Många spel idag innehåller adaptiv musik, alltså musik som anpassas utefter spelmotoriska variabler. En nackdel med mänskligt skapad adaptiv musik är att den i grunden baseras på linjärt musikaliskt material som sedan anpassas till ett ickelinjärt format. Med algoritmiskt genererad adaptiv musik kan nytt musikaliskt material genereras i realtid utefter algoritmiska parametrar och regelsystem, vars fortsatta spridning kan innebära både funktionella, estetiska och samhälleliga implikationer. Denna studie behandlar affektiva skillnader i mänskligt skapad- och algoritmiskt genererad adaptiv musik. En spelartefakt skapades i Unity och sammanslöts med adaptiva musiksystem genom FMOD, och genom Max via OSC-protokoll,varefter en studie baserad på blandad metod genomfördes där 8 deltagare fick spela igenom spelartefakten i vilken deras upplevda affekt av de ovanstående adaptiva musikformerna jämfördes. Resultaten indikerade en preferens för den mänskligt skapade adaptiva musiken.Framtida arbete bör fokusera på att utveckla den generativa musikens funktionalitet till förmån för områdets utveckling och utökade applikationsmöjligheter
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Vondruš, Jiří. "Návrh a konstrukce modelu automatické galvanizační linky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217635.
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This thesis deals with the design of automated system of electroplating. The first part is centered on designing the technological process for this electroplating and the setout of operating vats. It also deals with the project of mechanical construction, electrical system, with the computing procedure and the optimum choice of gear for galvanic line model. The work includes the design of a DC motor controller, the computing procedure and the construction of heating element for vats heater simulation. The last part of this thesis offers an insight to the control system and the assembled program. In the addendum, the photo of the realized model, the wiring scheme, and the programme transcript for control galvanic line model can be found.
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Chen, Wei-ting, and 陳威廷. "Three-phase Excitation Synchronous Generator of Stand-alone Wind Power Generation System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/18508337129853483101.
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碩士<br>國立中山大學<br>電機工程學系研究所<br>101<br>In this thesis, a novel wind power generator system with an excitation synchronous generator is proposed. In this system, the excitation synchronous generator’s rotation speed, and frequency are maintained by servo motor position control. By using static voltage control loop, the excitation current adjusts the excitation field to achieve the goal of stable voltage. Added battery into system be a power buffer, making more effective use of available wind energy. In this novel structure, the wind power and servo motor power are combined and transmitted to the excitation synchronous generator with coaxial configuration. In this novel structure, the wind power and servo motor power are combined and transmitted to the excitation synchronous generator with coaxial configuration. Avoiding power consumption when system in operation, and it improves system efficiency and controllability.
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Wu, Hoa-xuan, and 鄔豪軒. "Single-phase Excitation Synchronous Generator of Stand-along Wind Power Generation System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/34241941448642711584.
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碩士<br>國立中山大學<br>電機工程學系研究所<br>101<br>In this thesis, a single phase stand-alone wind power generator with power flow management strategy (PFMS) is proposed. In the system, wind power and servo motor power are combined and transmitted to the excitation synchronous generator via a coaxial configuration. The rotor speed of the excitation synchronous generator tracks the utility grid frequency by using servo motor tracking technologies. The automatic voltage regulator (AVR) governs the exciting current of generator to achieve the control goals of stable voltage. While the wind power is less than the needs of the AC loading, the proposed PFMS increases motor torque to provide a positive power outputs for the loads, meanwhile keeps the generator speed in constant. Conversely, during the wind power is greater than the output loads, the redundant generated by the generator is charged to the battery pack so as to maintain the motor speed in constant with very low power consumption. The operation principles with software simulation for the system are described. The experimental results of the laboratory prototype are shown to verify the feasibility and excellent performance of the system.
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Hsiao, Wen-Ning, and 蕭文寧. "Time-Domain Analysis of Dynamics for Shipboard Generator Excitation System." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/34638557617968202229.
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碩士<br>國立臺灣海洋大學<br>電機工程學系<br>98<br>The shipboard electric power system is an independently operated system. The external help will not be immediately available if machine failure or contingency occurs when the ship sails on the sea. Moreover, the required reliability of the shipboard electric power system is higher than that of the seashore power system since the frequent load variations on board are likely to result in system instability.
In order to study the dynamics of the shipboard electric power system in various loading states, we adopt a sample s study system of which the equivalent dynamic models under four operating conditions are established. Then based on time-domain performance indices, such as maximum overshoot, settling time, and damping ratio, the system dynamic responses subject to small disturbance under different values of excitation system parameter are investigated for finding the proper parameter of the excitation system. To verify the effectiveness of parameter tuning of the excitation system in improving the system dynamic characteristics, the time-domain approach is also employed to compare the system responses subject to large disturbance before and after the adjustment of excitation system parameter. It is found that proper setting of excitation system parameter is capable of improving the system dynamic characteristics.
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Huang, Kuo-Sheng, and 黃國生. "Excitation System Design and Analysis based on Different Synchronous Generator Models." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/33639357838264803964.
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碩士<br>義守大學<br>電機工程學系碩士班<br>95<br>This thesis presents the excitation system design and analysis of a synchronous generator considering 4 different models, from 3rd order to 6th order differential equations. The excitation system, including automatic voltage regulator (AVR) and power system stabilizer (PSS), is designed on the basis of various synchronous generator models. Performance of excitation system is further analysed and discussed. Computer simulation results show that the excitation system design based on 3-order synchronous generator has the robust performance.
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Butros, Peter. "Simulations of Rotating Brushless AC Excitation System with Controlled Thyristor Bridge Rectifier for Hydropower Generators." Thesis, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-166403.
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This thesis aims to simulate and find out more about the electrical dynamics of a six-phase exciter for hydropower generators. Because ordinary electric circuit-based simulation software only simulate three-phase electrical systems, a FEM-based software is used for the electrical dynamics simulations of the six-phase system. The objective is to analyse the pulsation behaviour of the rectified electrical output on the six-phase system and compare it to the three-phase system. The three-phase system is also simulated with filters with the aim of decreasing the amplitude of the pulsations on the electrical output. It is expected that an upgraded system from a three-phase system to a six-phase system should double the pulsation frequency on the rectified electrical output. However, the result shows that the rectified electrical output of the six-phase system consists of pulsations with unexpected frequencies. The simulated RL-filter on the three-phase system shows only insignificantly small changes on the rectified electrical pulsation amplitude.
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Shao, Ming-kai, and 邵明凱. "System Modeling and Dynamic Response Simulation Study for Thermal Brushless-Excitation Generator." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/dad69v.
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碩士<br>國立中山大學<br>電機工程學系研究所<br>96<br>The fundamental character of excitation system is to provide the direct-current power for field windings for synchronous generators. Excitation control system controls the generator output voltage and reactive power by varying the field winding’s currents. Therefore, it can improve the transient stability of power system.
The thesis proposed a process for modeling and simulation on a brushless coal-fired unit, since the 40 years-old magnetic amplifier (Type WMA MAG-A-STAT) Automatic Voltage Regulator (AVR) was replaced by a Programmable Logical Controller based digital redundancy system, for the purpose to verify the excitation system model and dynamic response gains in the future power system study. To establish the generator excitation system and simulations on a popular software program MATLAB/SIMULINK, we wish to manipulate the effective and precise simulation test on a personal-computer and apply Particle Swarm Optimization (PSO) to find the global optimal solution for AVR controller settings. This thesis contributes in building a reliable excitation system model with dynamic response figures for power system network planning and dispatch.
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蕭逸揚. "Effects of Excitation System Parameter on Dynamics of Power Plant Emergency Generator." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/18717313064950448361.
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Huang, Ji-Xian, and 黃繼賢. "Three-phase Converter-less Excitation Synchronous Stand-alone Wind Power Generator System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/40379846521433365156.
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碩士<br>國立中山大學<br>電機工程學系研究所<br>101<br>In this thesis, a novel wind power generator framework is proposed. The novel structure has high efficiency conversion of wind energy to electrical energy by using excitation synchronous generator. Added a static speed motor into system , reaching the fixed-frequency of the generator output voltage. By using static voltage control loop, the excitation current adjusts the excitation field to achieve the goal of stable voltage. In this innovative architecture, the fan, the generator, the servo motor is coaxial configuration, to avoid gear caused by the consumption in operation, to enhance system efficiency and controllability. This thesis also demands energy flow management method, the battery is added to the system as an energy buffer, so that wind energy can be used more efficiently.
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Lin, Chin-wei, and 林晉緯. "Single-phase Converter-less Excitation Synchronous Stand-along Wind Power Generator System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/87729668257473789741.
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碩士<br>國立中山大學<br>電機工程學系研究所<br>101<br>In this thesis, a single-phase converter-less excitation synchronous stand-along wind power generator system is proposed. In order to simplify the system and improve the system efficiency. In this system, coaxial connection has been employed instead of the gear box that used in conventional wind power generator system. In this system, wind turbine power and servo motor power are integrated to drive the excited synchronous generator. By using constant voltage control strategy, the output voltage can still remain stable when load is changing. Additionally, to combine power flow management strategy as well, excess power will be shunted to charge the battery when the input power greater is than the consuming power. According to the verification of the simulations and experiments, the goal of effective use of the wind power and excellent performance can be established.
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Chiu, Jin-jie, and 邱金杰. "Application of Frequency Domain Control Techniques to Excitation System Design for Synchronous Generator." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/19981889577033752165.
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碩士<br>義守大學<br>電機工程學系碩士班<br>93<br>Exciter is an important device of a synchronous generator. Proper design of excitation system can control the terminal voltage and reactive power output of the generator. This thesis uses the control theory frequency-domain techniques to design the exciter, including an automatic voltage regulator (AVR) and a power system stabilizer (PSS). The function of AVR aims to follow reference generator voltage signal. This can be treated as the tracking problem in control system applications. Therefore, a phase-lag type controller is selected for the AVR design. On the other hand , the function of PSS attempts to speed up the exciter transient response as well as increase power system stability. Hence, a phase-lead type controller is designed for the PSS. Computer simulations of a power system involved single synchronous connected to an infinite bus justify the proposed controllers. Both controllers, AVR and PSS, improve significantly the signal tracking, and disturbance regulation, respectively.
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Chiang, Wen-chuan, and 江汶銓. "Application of Time Domain Control Techniques to Excitation System Design for Synchronous Generator." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/19671700380819511103.
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碩士<br>義守大學<br>電機工程學系碩士班<br>93<br>Exciter is an important device of a synchronous generator. This thesis uses the controltheory time-domain techniques to design the exciter, including an automatic voltage regulator (AVR) and a power system stabiliser (PSS). The function of AVR aims to follow reference generator terminal voltage signal. This can be treated as the tracking problem in control system application. Therefore, a proportional-integral type controller is selected for the AVR design. On the other hand, the function of PSS attempts to speed up the exciter transient response as well as increase power system stability. This is a typical regulation problem in control system theory. Hence, a proportional-derivative type controller is designed for the PSS. Computer simulations of a power system involved single synchronous connected to an infinite bus justify the proposed controllers. Both controller, AVR and PSS, improve significantly the signal tracking, and disturbance regulation, respectively.
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Chen, Min-Rong, and 陳民融. "Maximum Power Tracking Control Applied to Grid-connectedWind Power System with Excitation Synchronous Generator." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/01488642311328702287.
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碩士<br>國立中山大學<br>電機工程學系研究所<br>101<br>This thesis presents a novel structure of wind power system, which simplifies the framework and improves the efficiency of traditional wind power system. Comparing to induction generator and permanent magnet synchronous generator, the proposed wind power system adapts the structure of coaxial coupling and equips the excitation synchronous generator. The proposed wind power system can be connected to grid directly without the voltage converter of the generator output.
In addition, this thesis proposes a method of Maximum Power Tracking Control used in the proposed structure,
which improves the efficiency of traditional wind power system. According to the result of experiment, the real power of the proposed wind power system can be transported to the grid side.
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Chen, Wei-Ting, and 陳韋廷. "Maximum Power Tracking Control of A Novel Wind Power System with An Excitation Synchronous Generator." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/89490317731534993688.
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碩士<br>國立中山大學<br>電機工程學系研究所<br>101<br>The thesis proposed a novel wind power control structure, It simplifies system framework and improves system efficiency. We used coaxial coupling in wind power system, which removes the gear-box in the traditional wind power system, hence reduced energy loss and system weight. We used synchronous generator in generation system to avoid induction generator control delay. Because the use of excitation generator removes the AC-DC-AC circuit, the generator output can be connected to grid directly ,hence reduces the loss of the control circuit. In addition, the thesis proposed a Maximum Power Tracking Control with excitation synchronous generator, which improves the conversion efficiency of the wind power generation system. Wind power transforms electric power efficiently.
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Suriyaarachchi, Don Hiranya Ravipriya. "Sub-synchronous interactions in a wind integrated power system." 2014. http://hdl.handle.net/1993/23984.
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This thesis presents a comprehensive procedure to study sub-synchronous interactions in wind integrated power systems effectively and efficiently. The proposed procedure involves a screening phase and a detailed analysis phase. The screening is performed using a frequency scan and the detailed analysis is performed using small signal stability analysis. To facilitate the small signal analysis, a detailed linearized model of a Type 3 wind power plant is presented in this thesis. The model presented includes the generator, a three-mass drive train model, rotor and grid side converter controller models, converter transformer model and the pitch controller model. To accurately capture the effects of sub-synchronous interactions, the ac network is modelled using dynamic phasors.
It is shown that using the proposed procedure, the sub-synchronous interaction between a Type 3 wind power plant and a series compensated line is due to an electrical resonance between the wind power plant generator and the series capacitor. It is also shown that this interaction is highly controllable through the rotor side converter current controllers. This fact will be proven by studying the sub-synchronous interactions in a single machine power system as well as in multi machine power systems.
This thesis also presents a sub-synchronous interaction mitigation method using network devices. The performance of an SVC and a STATCOM is evaluated in this thesis. A small signal stability analysis based method will be used to design a sub-synchronous damping controller. A method will be presented to estimate the damping controller parameters systematically to obtain the desired performance using small signal stability analysis results.
Furthermore, it will be shown that by strongly controlling the voltage of the point of common coupling, the damping of the oscillations produced by the sub-synchronous interaction between the wind power plant and the series compensated line can be improved.
Based on the findings of this research, the thesis proposes a number of recommendations to be adopted when studying the sub-synchronous interactions in wind integrated power systems. These recommendations will facilitate to do such studies effectively and pinpoint the root cause of the sub-synchronous interactions.
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Chuang, Yung-Sung, and 莊永松. "Dynamic Performance Test of Static Excitation System and Improvement of Electromechanical Mode for Synchronous Generators." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/2k78xt.
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博士<br>國立臺灣科技大學<br>電機工程系<br>94<br>In this dissertation, the dynamic performances of the synchronous generators with static excitation systems in the Tong-Shiao Generation Station, which suffers disturbances of voltage flicker, were examined and improved. The parameters of static excitation systems were tuned to enhance the damping of exciter and electromechanical modes. The disturbances to the 161kV bus of the station are caused by the fluctuating reactive power from nearby electric arc furnaces. This had even tripped the generators with static excitation systems because it did not have enough the damping. The measurement and analysis work was finished within four years. Firstly, field test methods have been used to assess the dynamic performance of generators with static excitation systems. A small unit step signal was injected into the reference input terminal of excitation systems to measure and analyze the dynamic responses of the generators under no-load and full-load condition. The dynamic performance conditions are derived from the terminal voltage waveforms of generators. Secondly, least-square-error method was used to identify parameters of the inner-loop regulators in the automatic voltage regulators of static excitation systems and the terminal voltage sensors. The hybrid differential evolution method is used to find the suitable parameters to improve the exciter modes and the electromechanical modes. This paper also serves to investigate the application of hybrid differential evolution method in the tuning of conventional lead-lag phase compensation and output feedback power system stabilizers to enhance damping of electromechanical modes. The results show that the method in this dissertation can improve the dynamic performance of static excitation system and enhance the damping of exciter and electromechanical modes. The conventional lead-lag phase compensation and the output feedback power system stabilizers also can increase the damping of electromechanical modes.
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Li, Wen-Yang, and 李文揚. "Torsional vibration analysis for wind-turbine generator blades and shafts subject to power system excitations." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/40752105442035817051.
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碩士<br>高苑科技大學<br>電子工程研究所<br>98<br>Wind energy is one of the most popular and economic renewable energy generations. According to the statistics, there is about 3GW wind energy power potentially in Taiwan. If the grid-connected wind turbine generator is subjected to the network faults, the induced electromagnetic torque gives rise to torsional torque stresses on turbine drive train components, namely blades and high/low speed shafts. This project employs a single induction machine-infinite system of middle voltage level containing a fixed-speed wind turbine, in order to investigate the wind turbine torque behaviors owing to network faults. From the simulation results, it is found that all the turbine components are sensitive to unidirectional component excitation (the real power pulsation). Therefore,the worst-case impact is simulated and resulted from threephase-to-ground fault. The auto-reclosing time of circuit breaker next to wind power plant should be carefully examined in order to ensure long-term safety operation.
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Lee, Lung-Chun, and 李龍群. "Dynamic Performance Analysis of Digital Static Excitation Control System with PSS for Co-generation Plant." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/06634161200219824640.
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碩士<br>長庚大學<br>電機工程研究所<br>90<br>This thesis aims to introduce the dynamic performance evaluation of the digital static excitation control system (DSECS) equipped with power system stabilizer (PSS) for a real co-generation plant. First, the structure of digital excitation system and the time domain stability test method for excitation control systems (ECS) are briefed and listed. The function and rules of parameter setting of power system stabilizer suggested by the IEEE-421.2 are introduced. Accordingly, the PSS is designed based on the linearlinzed single-machine against infinite-bus model. Finally, the power system simulation programs, Matlab and ETAP, are employed for simulations to evaluate the dynamic performances of DSESC with PSS for the co-generation plant suffering various types of disturbance.