Dissertations / Theses on the topic 'Active power line conditioner'
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1
Chen, Yaow-Ming. "Active power line conditioner with neural network control /." free to MU campus, to others for purchase, 1997. http://wwwlib.umi.com/cr/mo/fullcit?p9841132.
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Kirawanich, Phumin. "Fuzzy logic control for an active power line conditioner /." free to MU campus, to others for purchase, 2002. http://wwwlib.umi.com/cr/mo/fullcit?p3060114.
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Jones, Kevin David. "Harmonic distortion correction using active power line conditioners." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA300873.
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Zupfer, Joel E. "Optimal adaptive estimation algorithm for harmonic current reduction using power limited active line conditioners." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA277354.
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Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, December 1993.Thesis advisor(s): Ashton, Robert W. ; Cristi, Roberto. "December 1993." Includes bibliographical references. Also available online.
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Миколаєць, Дмитро Анатолійович. "Фільтро-компенсуючий перетворювач в системі гарантованого електроживлення." Doctoral thesis, Київ, 2015. https://ela.kpi.ua/handle/123456789/17617.
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Дисертація присвячена розробці теоретичних і практичних засад побудови системи гарантованого електроживлення на базі фільтро-компенсуючого перетворювача.
В роботі розроблено математичні моделі та виведено аналітичні вирази, які дозволяють визначити основні параметри силової частини фільтро-компенсуючого перетворювача, а також законів його керування, при функціонуванні з системою заряду акумулятора. Запропонована система електроживлення на базі фільтро-компенсуючого перетворювача здатна виконувати як функцію джерела безперебійного живлення, так і компенсатора реактивної потужності. З використанням методу розрахунку системи за середніми значеннями струмів та напруг при врахуванні відношення між енергіями навантаження та заряду акумулятора розраховані параметри реактивних елементів та величини задавальних струмів та напруг, необхідних для забезпечення ефективної роботи системи. Спрощені методи розрахунку напруги конденсатора фільтро-компенсуючого перетворювача з використанням регулювальних характеристик та балансу енергій, а також амплітуди вхідного струму дозволяють значно знизити затримку мікропроцесорної системи керування при обчисленні керуючих впливів. Використовуючи метод заряду акумулятора імпульсним асиметричним струмом, забезпечується подовження терміну служби батарей. В системі гарантованого електроживлення на базі фільтро-компенсуючого перетворювача необхідно враховувати збільшення ємності накопичувального конденсатора. Основні теоретичні викладки роботи підтверджуються результатами комп’ютерного моделювання.
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El, Shatshat Ramadan A. "A novel modular approach to active power-line harmonic filtering in distribution systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ60532.pdf.
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Zhang, Xiaolang. "A programmable-gain amplifier and an active inductor for in-vehicle power line communications." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/37014.
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In-vehicle power-line communication (VPLC) is a communication technique that uses
the power lines of the vehicle for data transmission. Based on the measurements of the power
line communication channel, the channel response is characterized as frequency selective,
time and location dependent with high signal attenuation. Also, the access impedance
changes a lot in different frequency ranges. These properties impose design challenges at
both system level and circuit levels of a VPLC system. This thesis presents the design of two
critical building blocks of a VPLC system, namely, a variable gain amplifier (VGA) and an
active inductor.
VGAs are used to amplify the signal to a predefined level without introducing too much
distortion. The presented VGA design targets a 0.13μm CMOS technology. The VGA design
is discussed in detail. Gm-boosting technique is used to both increases the linearity and
provide a programmable 0 dB to 60 dB gain over a broadband. Furthermore, the gain is
stable over a wide range of temperatures. The circuit is fabricated and tested, and the
measured results are in good agreement with the simulation results.
Inductors are commonly used in impedance matching networks. In this work, an active
inductor circuit is designed which provides a wide tuning range for VPLC LC matching
networks. Active inductor is a good candidate to replace the passive inductor in the LC
matching network since it has a smaller area, wider tuning range, and a higher quality-factor.
The designed active inductor is a fully differential grounded Gyrator-C active inductor.
Simulation results confirm that the inductor has wide tuning range with linear tuning ability;
however, its bandwidth is limited.
The circuit design for this VPLC system is challenging, the preliminary results of the
proposed circuits show some promise; however, further work is still needed to improve the
performance.
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Sansawatt, Thipnatee Punim. "Adaptive control for active distribution networks." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/6268.
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Rise of the global environmental awareness and climate change impacts caused by greenhouse gases emissions brings about a revolution in the power and energy industries to reduce fossil fuels and promote low-carbon and renewable distributed generation (DG). The new dimensions, mainly encouraged by the governments’ legislative targets and incentives, have allowed the development of DG worldwide. In the U.K., renewable DG especially wind is being connected on distribution networks and ranges widely in scales. Despite the growing number of potential DG sites, the surplus generation present on the passive networks can lead to some technical problems. In particular, rural networks where wind farms exist are prone to voltage rise and line thermal constraints. In order to accommodate new DG and ensure security of supply and network reliability, active management to mitigate these issues are required. In addition, the duties to provide cost-effective DG connections at avoided expensive investment incurred from conventional solutions, e.g., reinforcement and maintain robust network are a major challenge for Distribution Network Operators (DNOs). This thesis endeavours to develop an adaptive control scheme that provides local and real-time management against voltage variations and line capacity overload at the point of wind connections on rural distribution networks. Taking into account maximising power exports and providing an economically-viable control scheme, the wind turbine’s capability, comprising reactive power control and active power curtailment, is used. Whilst the thesis concentrates on the decentralised control applying several different algorithms, in addition, semi-coordinated and centralised approaches that adopt on-load tap changing transformers’ regulation and Optimal Power Flow tool are developed. Comparisons of these approaches based upon measures, i.e., economics, DG penetration and performance are determined. As an outcome, the developed scheme can enable growing integration of renewable DG on distribution networks and can be seen as an interim solution for the DNOs towards Smart Distribution Networks.
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Soares, Guilherme Márcio. "Capacitance reduction in off-line led drivers by using active ripple compensation techniques." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/6044.
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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Este documento apresenta uma nova técnica para a minimização da ondulação de baixa frequência, típica de conversores para o acionamento de LEDs alimentados a partir da rede elétrica. Esta estratégia baseia-se na modulação em baixa frequência da razão cíclica do conversor de modo que a ondulação de corrente possa ser reduzida e, consequentemente, as capacitâncias de filtragem do conversor possam ser minimizadas. Esta técnica foi desenvolvida para a aplicação em conversores de malha única, como é o caso de conversores de estágio único ou mesmo dois estágios integrados. A modulação da razão cíclica é projetada de maneira que o comportamento de baixa frequência das principais variáveis do conversor seja alterado, permitindo uma redução da ondulação da corrente de saída ao custo de um incremento cotrolado no conteúdo harmônico da corrente de entrada. Duas possíveis metodologias para a implementação da técnica proposta são discutidas ao longo do trabalho. A primeira envolve a injeção de harmônicas específicas no sinal da razão cíclica do conversor através de ramos adicionais na estrutura de controle. Esta abordagem foi aplicada para projetar um controlador de LEDs baseado em um conversor flyback e também em uma topologia integrada baseada na conexão cascata de dois conversores Buck-boost. Este estudo inicial foi expandido para outros conversores e uma análise generalizada acerca da influência da modulação da razão cíclica no comportamento de controladores de LED alimentados a partir da rede elétrica é apresentada. A segunda metodologia para a implementação da compensação ativa da ondulação de baixa frequência do conversor é baseada na otimização de um controlador proporcional-integral a fim de que tal elemento influencie não só no comportamento dinâmico do circuito, mas também na característica de baixa frequência do conversor. Por fim são discutidas as principais contribuições da tese e algumas propostas para trabalhos futuros são apresentadas
This document presents a novel approach for low-frequency output current ripple minimization in off-line light-emitting diode (LED) drivers. This strategy is based on the large-signal modulation of the duty-cycle so that the output ripple can be reduced and, consequently, the required filtering capacitances of the converter can be somehow decreased. This technique is devised to be used on converters in which a single control loop is employed, such as off-line single-stage or integrated converters. The duty-cycle modulation is used to change the shape of the main waveforms of the converter, especially the input and output currents. This allows for a reduction of the output current peak-to-peak ripple while the harmonic content of the input current is increased but kept within the limits imposed by the IEC standard. Two methodologies for implementing the proposed technique are discussed along the text. The first one is related to the injection of harmonic components to the duty cycle signal by means of additional branches inserted in the conventional control structure. This approach was applied to design an off-line flyback-based LED driver and also a circuit based on the Integrated Double Buck-boost converter. This first study was expanded to other topologies and a generalized analysis regarding the impact of the duty cycle modulation on off-line converters is then presented. The second methodology for implementing the ripple compensation is based on the optimization of a proportional-integral controller so that this element is designed to influence not only in the dynamic behavior of the circuit, but also in its low-frequency characteristic. Finally, the main contributions of this work are discussed and the proposals for future works are presented.
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Krátký, Michal. "Analýza toků jalového výkonu v distribuční soustavě." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220684.
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This thesis is focused on issues with transmission of reactive power though the distribution line of E.ON area. The goal is to find out where and in what rate are overflows of reactive power and to project the correctional steps to minimize this overflow. In this solution, there were used data of dispatcher measurement, which were processed by created source code in Matlab. The processing was analyzed for final conclusion. There were discovered shortages in overflow of reactive power in transfer between distribution and transmission line and in unsuitably regulated capacity power factor in Planá power plant and wrong automatic regulation of turns in 440/110kV substation Dasný. The action to minimize overflows of reactive power was projected by decompensation reactor placed in T101 and T102 transformers in substation Tábor.
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Constantin, Anca. "Linking the Power Sources of Emission-Line Galaxy Nuclei from the Highest to the Lowest Redshifts." Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1097611827.
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Ghetti, Frederico Toledo. "Análise de variações topológicas aplicadas a uma UPS tipo delta monofásica." Universidade Federal de Juiz de Fora (UFJF), 2009. https://repositorio.ufjf.br/jspui/handle/ufjf/3505.
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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
É apresentado, neste trabalho, um estudo sobre topologias alternativas de fontes ininterruptas de energia do tipo Delta, para o emprego em cargas monofásicas de até 1kVA. O estudo prevê a inserção de um conversor CC-CC entre o conversor shunt e o banco de baterias. Tal modificação em relação à UPS do tipo Delta convencional otimiza o projeto do banco de baterias e requisita um menor número de células em série para sua confecção. Além disso, a proposta elimina o uso de transformadores de baixa freqüência, considerados em alguns trabalhos anteriores, o que também contribui para a redução do peso e volume do sistema. Duas diferentes topologias para o conversor CC-CC foram investigadas e comparações de desempenho e viabilidade foram realizadas. A topologia que apresentou melhor desempenho nos quesitos custo, volume e peso, foi selecionada para testes em bancada. Ao final, resultados simulados e práticos são apresentados para validação do modelo.
This dissertation presents a study on single-phase Delta-UPS topological alternatives for low power and low cost applications. The proposed topology has a DC-DC converter connected between the shunt inverter and the battery bank/series converter DC terminals, respectively. This modification will allow the downsizing of the DC battery bank as well as the removing of the series converter transformer. Two different topologies of the DC DC converter were investigated and a comparative study among them will be accomplished. Simulation results are presented and experimental results will be included to validate the proposed study.
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Santos, Raphael Jorge Millnitz dos. "Condicionador unificado de qualidade de energia dual com controle simplificado." Universidade do Estado de Santa Catarina, 2012. http://tede.udesc.br/handle/handle/1857.
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Previous issue date: 2012-02-28Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
This work introduces a dual unified power quality conditioner (iUPQC) made by two active filters, the series and the parallel. The parallel active filter is voltage controlled, responsible for maintaining the sinusoidal, regulated, balanced and harmonic free load voltage. The series active filter is responsible for draining a sinusoidal and harmonic free current from the utility grid whose current is synchronized with the fundamental component of the voltage utility grid, implying a high power factor. The advantage of this configuration is the use of the sinusoidal references for both active filters. First, the power quality is addressed by discussing the main utility grid distortions and the active solutions for these problems. The characteristics, the power structure definition and the power flow of the iUPQC are then addressed. Next, the high frequency filters of active filters are analyzed and designed, the circuit models are obtained and the iUPQC controllers are designed. The iUPQC simulation is then analysed and, finally, the last chapter is about the prototype developed at the university laboratory, and the analysis of the experimental results which were compared to the IEEE519-1992 standard
Esta Dissertação de Mestrado apresenta um condicionador unificado de qualidade de energia dual (iUPQC) trifásico a quatro fios, controlado analogicamente, composto por dois filtros ativos, o série e o paralelo. O filtro ativo paralelo é controlado em tensão, responsável por manter a tensão da carga senoidal, regulada, equilibra e livre de harmônicos. O filtro ativo série é responsável por drenar da rede de alimentação uma corrente senoidal, com baixa distorção harmônica e em fase com a componente fundamental de tensão da rede, garantindo alto fator de potência. A vantagem desta configuração é a utilização de referências senoidais para ambos os filtros ativos. Inicialmente, a qualidade de energia é abordada, trazendo as principais distorções encontradas na rede elétrica e as soluções ativas para estes problemas. O iUPQC é apresentado, trazendo suas características, a definição de sua estrutura de potência e o fluxo de potência do sistema. Após isto são analisados e projetados os filtros de alta frequência presentes nos filtros ativos, obtidos os modelos do circuito e projetados os controladores do iUPQC. Em seguida a simulação do iUPQC é apresentada e no último capítulo são mostrados os circuito utilizados no protótipo e os resultados experimentais obtidos, os quais são analisados e comparados à norma IEEE 519-1992.
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Dias, Josué. "Condicionador unificado de qualidade de energia com controle digital." Universidade do Estado de Santa Catarina, 2009. http://tede.udesc.br/handle/handle/1902.
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Previous issue date: 2009-12-11Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
This work shows a unified power quality conditioner based on a digital controlier. Such conditioner is composed of shunt active power filter, to compensate the input une current, and series active power filters to compensate the load voltage. The proposal consist in applying a simple control strategy based on direct comparison the input une current and load voltãge waveforms with sinusoidal references. Initially is presented a study about the active power conditioner characteristics, classification and topologies, foliowing UPQC power structure is explored, as converter definition, aspects for grid connection and analysis and project at passive filters. Afterwards, the mathematicál models are derived, the controllers are defined and simulations are performed. Finaily, the results obtained with UPQC practical tests are shown.
Este trabalho apresenta um condicionador unificado de qualidade de energia (UPQC) controlado digitalmente. Tal condicionador é composto por um filtro ativo paralelo, para compensar a corrente na rede, e um filtro ativo série, para compensara tensão na carga. A proposta consiste em aplicar uma estratégia de controle simples baseada na comparação direta da corrente na rede e tensão na carga com referências senoidas. Inicialmente é apresentado um estudo a respeito das topologias e classificação dos condicionadores de energia, em seguida é explorada a estrutura de potência do UFQC, como definição do conversor, aspectos relacionados à conexão com a rede e anAlise e projeto dos filtros passivos. Posteriormente são obtidos os modelos matemáticos, projetados os controladores e elaboradas simulações para, finalmente apresentar os resultados obtidos com os ensaios do UPQC.
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Meissner, Frank. "Zeithandeln in Projektarbeit." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-117509.
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Am Beispiel von Projektarbeit in der IT-Branche werden die Auswirkungen neuer Managementkonzepte auf die Zeitsouveränität von Projektbeschäftigten anhand qualitativer Interviews untersucht. Flexible Formen der Arbeitsorganisation zielen auf eine Veränderung des Arbeitskraftvermögens hin zu größerer Autonomie und Übernahme betrieblicher Verantwortung durch die Beschäftigten. Mit den veränderten Kontrollformen des Managements modifizieren sich die betrieblichen Machtverhältnisse.
Im Konzept des Zeithandelns werden die aktiven Gestaltungsleistungen der Beschäftigten bei der Arbeitszeitgestaltung hervorgehoben, gleichzeitig können verschiedene zeitsoziologische Theorien integriert werden.
Wesentliches Ergebnis der empirischen Untersuchung verschiedener Arbeitszeitkulturen in IT-Betrieben ist eine Machtverschiebung zugunsten des Managements. Auf Seiten der abhängig Beschäftigten ist positiv zu verbuchen: eine größere Autonomie in der Arbeit, die Ausdifferenzierung eigenständiger Zeitstile sowie eine hohe Wertschätzung und Anerkennung durch Vorgesetzte. Dagegen stehen restriktive Rahmenbedingungen wie Zeitdruck, ungünstige Bedingungen für die Work-Life-Balance und starke zeitliche und gedankliche Vereinnahmung der Beschäftigten durch den Betrieb. Durch das Fehlen kollektiver Formen der Interessenvertretung und einen defensiven Konfliktumgangsstil sind die betrieblichen Beziehungen durch individuelle Aushandlungsprozesse geprägt.
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Chen, Shi-Kuan, and 陳世寬. "Design of high power active power line conditioner." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/53711671402236525206.
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Wu, Jinn-Chang, and 吳晉昌. "Active Power Line Conditioner for Electrical Power Quality Improvement." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/09677003157263124724.
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博士國立成功大學
電機工程學系
88
With the fast growth of power demand and the proliferation of nonlinear loads, they have caused the degradation of electrical power quality. As the high quality of electrical power is crucial to the precise equipment in the industry, the issue of ensuring a high-quality electric power is increasingly important nowadays. This motivated the dissertation aimed at proposing effective control algorithms of active power line conditioner with the anticipation of bettering electrical power quality. With the advent of power electronics technology, the active power filter has been suggested to suppress the amount of harmonic current and upgrade the level of power factor. From the control object viewpoints, the active power filter can be further divided into current mode and voltage mode. In this dissertation, the current-mode active power filter is first investigated, and a new control method is proposed. The proposed method has the advantages of simple control circuit and less number of current sensors. Moreover, the mains current after compensation is balanced and undistorted in spite of the mains and load conditions. A three-phase prototype has been established to verify the performance of proposed control method. In addition, because of the practical need in a modern power system, the power rating of active power filter should be enlarged. Therefore, the cascade operation of current-mode active power filter is considered a possible solution. In the cascaded configuration, the active power filters accompanying with different switching frequency and power capacity are connected in cascade. A novel control method is proposed for the operation of this type of active power filters, where only one calculation circuit of reference current is required for all connected active power filters. The advantages exhibited by this method consist of a simpler control circuit and less number of current sensors. A prototype with two current-mode active power filters connecting in cascade was also implemented to verify the performance of proposed control method. The voltage-mode active power filter is also completed in this dissertation. A common drawback lies in that the response of this type of active filter is relatively slow. Hence, a new phase detection circuit and a new phase shift control circuit are proposed and used in the control circuit of voltage-mode active power filter, where a single-phase prototype was also completed to investigate its performance. To improve the power quality at load side, an active power conditioner is also developed in this dissertation. An active power conditioner contains only one power converter, which can be operated as a voltage regulator to maintain the load voltage constant and low total harmonic distortion. Various scenarios including utility under-voltage, over-voltage, outage, pollution and unbalance scenarios, are simulated and investigated. Test results consolidate the effectiveness and practicality of the proposed method for electrical power quality applications.
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許毓仁. "Investigation of Active Power Line Conditioners for Reducing Harmonics in Three-phase Power Systems." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/44410303274965091613.
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碩士中原大學
電機工程學系
85
Active Power Line Conditioner(APLC) is one type of the active filters. It can eliminate the harmonic pollution resulting from the nonlinear loads. The APLC injects the same magnitudes but opposite phases of the harmonic currents in order to compensate the voltage distortion. This thesis develops an optimal power flow method considering harmonic factors using the Generalized Benders Decomposition Theory. The problem is divided into the master level and the slave level. The slave level solves optimal power flow and optimal harmonic power flow; the master level determines the ratios of the transformers, the switched amounts of the capacitors and the sizes and locations of new APLCs. The master and slave levels are linked by the marginal costs until the problem is solved. Five-, six-, nine- and eighteen-bus power systems covering different connecting types of transformers, unbalanced loads and unbalanced harmonic currents are used to verify the applicability of the proposed method.
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Kuo, Lian-Chen, and 郭兩成. "Design and Implementation of Single-Phase Shunt Active Power Line Conditioners." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/44367925581019948519.
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碩士國立臺灣科技大學
電子工程系
87
The power factor correction has been an important issue of the power electronics application in recent years. The purpose of the correction is to shape the source-side current to be sinusoidal and in phase with the source voltage. There are two types of correction technologies. The first one is to insert a power factor corrector (PFC) in series between the power source and the load. The second one is to inject harmonic currents into the system by a shunt active power line conditioner (APLC). The main topic of this thesis is to develop new control strategies for the APLC. We will introduce the circuit structure and operating principles of the single-phase APLC first. Then three control methods are presented and discussed in detail. According to the design procedures, prototype systems are implemented and the experimental results show feasibility of the proposed methods.
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Lee, Jian-Rong, and 李建融. "CPLD based Active Power Conditioner." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/5j43pr.
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碩士崑山科技大學
電機工程研究所
93
Recently the wide growth of nonlinear load has issued the problem of power quality. The requirement of power quality for precise equipment, which is often used in the industrial process, is very strict. In this paper, a shunt active power conditioner (APC) is proposed for electric power quality improvement in the load side to improve the power quality and advance the reliability of precise equipment. The developed active power conditioner is configured by a power converter, a link inductor and a battery set. The power converter is used to supply a high quality voltage to the load. The link inductor is inserted between the mains and the power converter to block the power disturbance from the mains, and a battery set is placed at the dc side of power converter to supply the back-up power. Hence, the proposed active power conditioner can solve the problems of power quality, including mains under-voltage, over-voltage, voltage spike, outage and pollution. Moreover, the active power conditioner can also be operate as an interface of renewable energy to generate an high quality AC energy to the load or to the utility. Considering the progress of electronic industry, the developed active power conditioner is implemented by a CPLD chip to simplify the control circuit. Finally, a single-phase prototype is developed to verify the performance of CPLD based active power conditioner.
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Jiang, Ci-Rong, and 江啟榮. "A Study of Active Power Conditioner for Microgrid Operation and Control." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/10598827518561905427.
Full textAbstract:
碩士國立臺灣大學
電機工程學研究所
103
This thesis presents a novel active power conditioner, which has active and reactive power compensation functions, applied in micro-grid operation and control. In this study, the simulation micro-grids assumes consisting of a number of distributed genertaors. We apply the active power conditioner to connect two micro-grids. The active and reactive power compensation sceme is based on the droop control method and the hysteresis loop is added to reduce the number of count of switching. We also analyze the stability of the proposed controller and droop control compensation scheme. Finally,we discuss more microgrids compensation.Analysis how to allocate compensation ratio to achieve frequency variation is minimized.The performance evaluation of assumed micro-grid and the control schemes are conducted with a popular software package, MATLAB/Simulink. Some engineering insights from simulation results are obtained in this Thesis.
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Hsu, Yu-Cai, and 許育才. "A Study of Active Power Conditioner for Microgrid Operation and Control." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/80775177610866383395.
Full textAbstract:
碩士國立臺灣大學
電機工程學研究所
103
This thesis proposes a power flow control strategy for the three-phase back-to-back (BTB) converter with microgrid. The power flow between micro-grids can be regulated accurately. With the optimal ac-line current regulation strategy, the appropriate input current can be determined quickly to stabilize the dc-bus voltage of the BTB converter. The proposed BTB converter can be adopted as an active power conditioner to improve the power quality of the AC micro-grids. The active power conditioner with the proposed power flow control strategy can regulate the power flow between different AC micro-grids accurately. The platform is coded by popular software, MATLAB/Simulink.
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Wu, Wei-Jun, and 吳緯峻. "Design of Intelligent Air Conditioner Controller Using Power Line Carrier Technology." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/z2vpp9.
Full textAbstract:
碩士國立中山大學
電機工程學系研究所
97
This thesis develops a peers-to-peers intelligent air conditioner (A/C) controller which integrates the power line carrier technology and the infrared remote control. The intelligent air conditioner controller is used for the remote temperature setting and load control of air conditioner without requesting extra communication line and modification of the control circuit in the A/C unit. With the A/C controller developed the demand response in residential and commercial areas can be achieved effectively by reducing the peak power demand of A/C units. In order to investigate the PLC signal transmission over the low voltage distribution lines, the mathematical model of low voltage distribution system under high carrier signal frequency is derived. The computer simulation is executed to analyze the transmission characteristics of power line carrier signal. The proposed controller can receive the command issued by the demand response control center over the distribution lines with carrier frequency to execute the remote temperature setting of A/C units. Based on the field measurement of energy by air conditioner, it is found that significantly power demand reduction of air conditioner has been resulted by applying the proposed controller for remote temperature setting of air conditioner.
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Chen, Yen-Fu, and 陳彥輔. "Design and Implementation of an Active Power Conditioner with Optimal Power Flow Control Strategy." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/89286856724694237301.
Full textAbstract:
碩士國立臺灣大學
電機工程學研究所
102
This thesis proposes an optimal power flow control strategy to regulate the power flow of a three-phase back-to-back (BTB) converter. The proposed optimal power flow control consists of the optimal ac-line current regulation strategy and the dynamic dc-bus voltage regulation strategy. With the optimal ac-line current regulation strategy, the appropriate input current can be determined quickly to stabilize the dc-bus voltage of the BTB converter. The dynamic dc-bus voltage regulation strategy can alter the reference of the dc-bus voltage to prevent triggering of the DC voltage protection mechanism when an abrupt power change of the BTB converter occurs. The proposed BTB converter can be adopted as an active power conditioner to improve the power quality of the AC micro-grids. The active power conditioner with the proposed optimal power flow control strategy can regulate the power flow between different AC micro-grids accurately. Finally, experimental results measured from a prototype circuit are presented to demonstrate the performances of the optimal power flow control strategy.
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Merk, Marcel. "Active power filter for the cancellation of harmonic line current distortion." Thesis, 2000. http://hdl.handle.net/1957/33180.
Full textAbstract:
With the increased attention on high efficiency and energy savings, power electronic
energy conversion equipment is increasingly incorporated in all levels of the power system.
The drawback of such equipment is the generation of nonsinusoidal currents in the power
distribution network due to the nonlinear operation. Harmonic currents may distort
the line voltages and lead to several unwanted effects including equipment overheating,
system failure, interference with communication systems, etc.
In response to these concerns, this research presents an active filter for the cancellation
of harmonic line current distortion. The active filter used in this research is
connected in parallel with the nonlinear load and is designed for a three-phase three-wire
industrial power system. The filter consists of a voltage source inverter connected
through a coupling inductor to the terminals of the ac-source. The inverter is controlled
via a space vector-pulse width modulation (SVPWM) algorithm that is generated using
a digital signal processor (DSP). In order to reduce the distortion resulting from the
switching nature of the active filter inverter, a switching ripple filter is connected in
parallel.
The control algorithm of the active filter is based on the rotating reference frame
theory. For each harmonic which is to be cancelled, a corresponding synchronous reference
frame is generated to extract the harmonic phase and magnitude. With this
information, each harmonic current component can be separately controlled and the
proposed algorithm can therefore compensate for hardware effects such as measuring delays and component transfer functions. For the extraction of the harmonic components,
a finite impulse response filter is used in order to quickly react to changing load currents.
An adapting algorithm is implemented to compensate for slowly varying system
parameters.
Simulations under varying load and transient conditions are performed. The results
show nearly perfect cancellation performance for the proposed active filter control
algorithm.Graduation date: 2001
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Jiang, Shih-Jiyun, and 姜士鈞. "Power System Real-Time Active and Reactive Line Flows calculation by Sensitivity Factors." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/11551966306608703494.
Full textAbstract:
碩士建國科技大學
機電光系統研究所
94
The Calculation of line flows in power systems is a very important task for Real- Time Security Control or Contingency Analysis applications. In convention, they can be calculated by executing AC Load Flow program; however, it is time-consuming and exists convergence problem due to iteration. Therefore, several sensitivity factors, such as Generation Shift Distribution Factor (GSDF), Generalized Generation Shift Distribution Factor (GGDF) and ZBus Distribution Factor (ZBD) have been proposed to improve the computation time to fulfill the real-time fast computation requirement. But these factors can only reflect the bus injection active power changes to the line flows of real power, and never concern about the changes of bus reactive power. This will cause some poor accuracy problems in fast computation of real and reactive power line flows, due to neglecting the influence of reactive injection power changes. In this thesis, new sensitivity factors, which called Jacobian Based Distribution Factor (JBDF), are proposed to improve the shortcomings of the above mentioned three sensitivity factors. Not only they can precisely compute the real power line flows by reflecting the active and reactive power injection changes into the real power line flows, but also the reactive power line flows by the same way. This could be the first time in the real-time applications of power systems. The proposed JBDF method is tested by IEEE 14-Bus and IEEE 30-Bus systems. The numerical simulation results demonstrate that the proposed JBDF method is very accurate and fast in computation. It is very suitable for real-time applications.
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Parng, Charng-Sheng, and 龐長生. "Development of An Active Power-Factor-Correction AC/DC Converters With Line Voltage Variation." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/29632846849494751548.
Full textAbstract:
碩士國立交通大學
電機與控制工程系
88
This paper presents the design and implement of a single-phase power-factor correction ac-dc converter with high power factor,and fast output voltage dunamic response.In this paper,a sample and hold based ripple free input and output voltage sensing strategy is proposed,in order to improve converters output voltage dynamic response while obtained a higher quality waveform of input current.In addition,a mathematical model of the scheme is developed, and used to design a voltage compensator.To verify the operation and evaluate the performance of the proposed control strategy,a 250W laboratory prototype converter for an input voltage range from 90-260V(RMS)were developed and bulit.
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Chen, Po-Wei, and 陳柏煒. "Left/right-hand transmission line using active inductor in 0.18μm CMOS process and application on quadrature power splitter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/xcd9d7.
Full textAbstract:
碩士國立臺灣大學
電子工程學研究所
102
This thesis presents the implementation of a 3-7.6 GHz broadband quadrature power splitter (QPS) by combining both active and passive processes. The active process used is TSMC 0.18μm CMOS and the passive process used is FR4 printed circuit board (PCB). We use bond wire interconnects to combine the T18 chip and the PCB. This QPS uses CRLH transmission line theory for creating the positive phase and RH transmission line to create negative phase. Since conventional on chip spiral inductors has inductance values proportional to the area occupied and its parasitic resistance is proportional to its area, the quality factor (Q factor) is too low. This thesis uses an active inductor to replace the traditional passive spiral inductors to miniaturize the circuit area and obtain higher Q factor. Chip size is 250μm x480μm, power consumption is about 4.69mW, is less than -10dB, and the output amplitude imbalance is about 0.5dB at 3~7.6GHz.
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Silva, José Pedro Martins da. "Desenvolvimento de um condicionador unificado de qualidade de energia monofásico com controlo invertido." Master's thesis, 2020. http://hdl.handle.net/1822/72780.
Full textAbstract:
Dissertação do mestrado em Engenharia Eletrónica Industrial e ComputadoresA Qualidade de Energia Elétrica (QEE) é um tema cada vez mais importante no ramo da engenharia, pois os problemas na rede elétrica podem levar a que os equipamentos não funcionem corretamente. Isso, faz com que muitos clientes, no sector industrial serviços tenham prejuízos económicos muito elevados. Porém, muitos desses problemas ocorrem devido às cargas utilizadas pelos clientes que “poluem” a rede elétrica com potência reativa e harmónicas. Existem equipamentos de eletrónica de potência que mitigam estes problemas de Qualidade de Energia Elétrica, entre eles o Condicionador Unificado de Qualidade de Energia (Unified Power Quality Conditioner - UPQC). Esta dissertação aborda uma nova topologia deste equipamento chamado Condicionador Unificado de Qualidade de Energia com Controlo Invertido (iUPQC) Monofásico com a adição de baterias, para permitir o modo de alimentação ininterrupta da instalação (Uninterruptible Power Supply – UPS) denominando-se assim iUPQC-UPS. Um UPQC é um equipamento constituído por um condicionador ativo série (Conversor CC-CA) e um condicionador ativo paralelo (Conversor CC-CA) que ligam a um barramento CC comum. Este barramento irá ligar às baterias a partir de um conversor CC-CC bidirecional. O objetivo do UPQC com controlo invertido é que o condicionador ativo série absorva da rede a potência ativa necessária impondo uma corrente sinusoidal do lado da rede, enquanto que o condicionador ativo paralelo fornece às cargas uma tensão sinusoidal com frequência e valor eficaz normalizado. Desta forma, todas a potência reativa e harmónicas serão fornecidos pelo condicionador ativo paralelo. Esta dissertação apresenta um estudo bibliográfico dos condicionadores ativos de potência que mitigam os problemas de QEE, das topologias dos conversores de potência e dos seus algoritmos de controlo. Com base neste estudo, foi usada a ferramenta PSIM para fazer simulações dos modos de funcionamento do iUPQC-UPS. Posteriormente, foi desenvolvido o protótipo do iUPQC-UPS, constituído pelo sistema de controlo, sistema de comando e sistema de potência. Por ultimo, o protótipo foi validado ao retirar os resultados experimentais de todos os modos de funcionamento.
Electrical Power Quality is an increasingly important topic in the engineering field, as the problems created in the electrical network lead to the equipment not working properly. This causes many customers in the industrial services sector to have very high economic losses. However, many of these problems occur due to the loads used by customers that “pollute” the Electric Grid with reactive power and harmonics. There are power electronics equipment that mitigate these Power Quality problems, among them the Unified Power Quality Conditioner (UPQC). This dissertation approaches a new topology of this equipment called Unified Power Quality Conditioner with Inverted Control (iUPQC) with the addition of batteries, to allow the uninterruptible power supply of the installation (Uninterruptible Power Supply - UPS), thus called iUPQC- UPS. This equipment consists of a series active conditioner (DC-AC converter) and a parallel active conditioner (DC-AC converter) that connect to a common DC bus. This bus will connect to the batteries from a bidirectional DC-DC converter. The objective is that the series active conditioner absorbs the necessary power from the power grid while imposing a sinusoidal current on the power grid side, while the shunt active conditioner provides the loads with a sinusoidal voltage with normalized frequency and effective value. In this way, all reactive power and harmonics will be provided by the shunt active conditioner The batteries will charge or discharge as needed by the network. That is, if the power of the network is greater than the power of the loads, the batteries will use power from the network to charge. If the power of the network is less than the power of the loads, the batteries will discharge when supplying power to the loads.
Este trabalho de dissertação está enquadrado no projeto IC&DT “Quality4Power – Enhancing the Power Quality for Industry 4.0 in the era of Microgrids”, financiado pela Fundação para a Ciência e Tecnologia, com a referência PTDC/EEI-EEE/28813/2017
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Martins, Pedro Miguel Ferreira. "Freguês on-line: plataforma web de recepção, tratamento e gestão das solicitações dos cidadãos." Master's thesis, 2011. http://hdl.handle.net/10071/7323.
Full textAbstract:
O presente trabalho projecto, intitulado “Freguês On-line: Plataforma Web para
recepção, tratamento e gestão das solicitações dos cidadãos”, visa implementar uma
ferramenta informática que potenciei uma relação mais eficaz entre os fregueses da
freguesia de Odivelas e a Junta de Freguesia, tendo como matéria central as solicitações
dos cidadãos.
Para tal Começamos por fazer uma abordagem teórica em torno da evolução do Estado,
visando a necessidade dos processos de reforma no desenvolvimento dos novos modelos
de gestão pública, para no final do primeiro capitulo aflorarmos o exercício e os direitos de
cidadania.
No segundo capítulo canalizamos a análise para a identificação dos actuais canais
de comunicação existentes na freguesia em apreço, discernindo sobre as suas
disfuncionalidades e as medidas de melhoria conducentes a uma relação mais próxima, mas
acima de tudo mais eficaz com o cidadão para terminar com a apresentação da plataforma
informática que encerra todo o trabalho projecto.
No terceiro capítulo para além da limitação dos campos de intervenção das medidas
propostas, versaremos sobre as dificuldades que se podem esperar na implementação e os
impactos internos e externos que a mesma tratará quer junto dos cidadãos, quer junto dos
serviços, quer junto da classe dirigente, terminando com a apresentação sumária de um
processo de monitorização e avaliação ao processo proposto.This research project, titled "Online Customer: Web Platform for reception, treatment and management of requests from citizens," aims to implement a software tool that enhances a more effective relationship between the patrons of the parish of Odivelas and the Parish Council, having as a matter central to citizens' requests. We begin to making theoretical developments around the state evolution, order the need of reform processes in the development of new public management models, to the end of the first chapter touched upon the exercise of citizenship and rights. In the second chapter will identify the existing communication channels in the parish, discerning about their dysfunctions and measures for improvement a closer relationship, and effectively with citizens to in the end presenting the platform that contains the whole work project. In the third chapter beyond to talking about the fields of intervention of the proposed measures, we will explore the difficulties to be expected in the implementation and internal and external impacts from the citizens, from the services and from the ruling class, ending with a summary presentation of the monitoring process and evaluation procedure proposed.
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Gomes, Rui Manuel Marques. "Desenvolvimento de um Conversor CA-CC para o Condicionador Ativo Série de um UPQC Trifásico." Master's thesis, 2019. http://hdl.handle.net/1822/66038.
Full textAbstract:
Dissertação de mestrado em Engenharia Eletrónica e de ComputadoresCom o crescente incremento do uso de cargas não-lineares, cada vez mais tem aumentado a degradação da qualidade de energia elétrica. Este aumento deve-se ao facto de que muitos dos equipamentos que utilizamos hoje em dia requerem que se converta a tensão alternada da rede elétrica em tensão contínua através de díodos ou tirístores. Estes equipamentos, chamados de cargas não-lineares, provocam vários tipos de problemas em relação à qualidade de energia elétrica, como distorção das formas de onda de tensão e corrente, sobreaquecimento de cabos de alimentação e transformadores, funcionamento incorreto de determinados equipamentos mais sensíveis, entre muitos outros problemas. Para resolver essas questões, apresenta-se, nesta dissertação, o processo de desenvolvimento de um protótipo de um condicionador ativo série, o qual permite a compensação dos seguintes problemas de qualidade de energia elétrica: sags, swells, desequilíbrios e harmónicos de tensão. Esta dissertação destaca-se pelo facto de estar englobada num equipamento denominado UPQC (Unified Power Quality Conditioner – Condicionador Unificado de Qualidade de Energia Elétrica), que adicionalmente também integra uma interface com energias renováveis. Ao longo deste documento é descrito, passo a passo, o estado da arte sobre o tema mencionado, sendo apresentado o levantamento de algumas topologias e algoritmos de controlo existentes, com ulterior escolha de cada um deles, bem como a implementação e teste com interpretação dos resultados obtidos.
With the increasing raise of the use of non-linear loads, there has been a raise on the degradation of the electric power quality. This raise is due to the fact that many equipments we use nowadays require that the AC voltage of the electrical network needs to be converted to DC using diodes or thyristors. This hardware, called non-linear loads, causes various types of problems regarding to the electrical power quality, such has distortion of the waveforms of voltage and current, overheating of the power cables and transformers, malfunction of more sensitive equipment, among many other problems. To solve these questions, is presented on this dissertation, the process of developing a prototype of an active conditioner series, which allows the compensation of the following electric power quality problems: sags, swells, imbalances and voltage harmonics. This dissertation stands out because it is included in a UPQC (Unified Power Quality Conditioner) in which integrates an interface with renewable energies. Throughout this document, the state of the art on the mentioned topic is described step by step and presented the survey of some existing control algorithms, with subsequent choice of each one, as well as the implementation and test with interpretation of the obtained results.
Este trabalho de mestrado está enquadrado no projeto “ESGRIDS – Enhancing Smart GRIDs for Sustainability”, financiado por Fundos FEDER através do Programa Operacional Competitividade e Internacionalização - COMPETE 2020 e por Fundos Nacionais através da FCT - Fundação para a Ciência e tecnologia, com a referência SAICTPAC/0004/2015 – POCI-01-0145-FEDER-016434. Este trabalho de mestrado está enquadrado no projeto de IC&DT “newERA4GRIDs – New Generation of Unified Power Conditioner with Advanced Control, Integrating Electric Mobility, Renewables, and Active Filtering Capabilities for the Power Grid Improvement”, financiado pela Fundação para a Ciência e a Tecnologia, com a referência PTDC/EEI-EEE/30283/2017.