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Žůrek, Tomáš. "Řízení trojfázového sinusového zdroje." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220914.
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This thesis deals with control of three phase inverter as three phase sinusoidal voltage source for UPS application. Thesis is split to two parts, teoretical and practical. Teoretical part deals with three phase inverter topology analysis according requirement of neutral line wire and possibilities of generating sinusoidal PWM in depend of topology. There are also analysed properties of contorled system and designed 3 regulation methods with simulations. Second part of thesis deals with realisation of sinusoidal power source with inverter borrowed by Elcom company. To inverter control is used digital signal controler TMS320F28335 with implemented control algorithms. There are also presented the measurement results of the prototype of power source. In conclusion, simulation results are compared with measurements and achieved results are summarized.
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Lam, Chi Seng. "An adaptive low dc-voltage controlled LC coupling hybrid active power filter in three-phase four-wire power systems." Thesis, University of Macau, 2012. http://umaclib3.umac.mo/record=b2580608.
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Wang, Lei. "Design and implementation of a three-phase three-wire thyristor controlled LC-coupling hybrid active power filter with low dc-link voltage and wide compensation range." Thesis, University of Macau, 2017. http://umaclib3.umac.mo/record=b3691876.
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Zubi, Hazem M. "A genetic algorithm approach for three-phase harmonic mitigation filter design." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604881.
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In industry, adjustable speed drives (ASDs) are widely employed in driving AC motors for variable speed applications due to the high performance and high energy efficiency obtained in such systems. However, ASDs have an impact on the power quality and utilisation of AC power feeds by injecting current harmonics and causing resonances, additional losses, and voltage distortion at the point of common coupling. Due to these problems, electric power utilities have established stringent rules and regulations to limit the effects of this distortion. As a result, efficient, reliable, and economical harmonic mitigation techniques must now be implemented in practical systems to achieve compliance at reasonable cost. A variety of techniques exist to control the harmonic current injected by ASDs, and allow three-phase AC-line-connected medium-power systems to meet stringent power quality standards. Of these, the broadband harmonic passive filter deserves special attention because of its good harmonic mitigation and reactive power compensation abilities, and low cost. It is also relatively free from harmonic resonance problems, has relatively simple structural complexity and involves considerably less engineering effort when compared to systems of single tuned shunt passive filters or active filters and active rectifier solutions. In this thesis, passive broadband harmonic filters are investigated. In particular, the improved broadband filter (IBF) which has superior overall performance and examples of its application are increasing rapidly. During this research project, the IBF operating principle is reviewed and its design principles are established. As the main disadvantage of most passive harmonic filters is the large-sized components, the first proposed design attempts to optimize the size of the filter components (L and C) utilized in the existing IBF topology. The second proposed design attempts to optimize the number and then the size of filter components resulting in an Advanced Broadband passive Filter (ABF) novel structure. The proposed design methods are based on frequency domain modelling of the system and then using a genetic algorithm optimization technique to search for optimal filter component values. The results obtained are compared with the results of a linear searching approach. The measured performance of the optimal filter designs (IBF and ABF) is evaluated under different loading conditions with typical levels of background voltage distortion. This involves assessing input current total harmonic distortion, input power factor, rectifier voltage regulation, efficiency, size and cost. The potential resonance problem is addressed and the influence of voltage imbalance on performance is investigated. The assessment is based on analysis, computer simulations and experimental results. The measured performance is compared to various typical passive harmonic filters for three-phase diode rectifier front-end type adjustable speed drives. Finally, the broadband filter design’s effectiveness and performance are evaluated by involving them in a standard IEEE distribution network operating under different penetration levels of connected nonlinear total loads (ASD system). The study is conducted via detailed modelling of the distribution network and the linked nonlinear loads using computer simulations.
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Zhang, Huibin. "Application of multilevel inverter as shunt active power filter in three-phase three-wire power system." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501797.
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This research investigates application issues of the active power filter to three-phase three-wire systems, with unbalanced, distorted loads where the line impedance gives rise to voltage distortion at the point of common coupling. Five shunt active power filters are investigated: two-level, wye connected cascaded three and five level, and diode-clamped three and five level. Capabilities of the different shunt active power filter topologies to mitigate voltage/current distortion, compensate reactive power, and balance real power from the source are investigated. Results indicate that neutral point clamped multilevel inverters have advantages over wye cascaded multilevel inverters when operating under asymmetrical load conditions.
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Chunkag, Viboon. "Three-phase power-factor correction using single-switch and parallel connected switching converters." Thesis, University of Bath, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336239.
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Ingram, David. "An Evaluation of Harmonic Isolation Techniques for Three Phase Active Filtering." Thesis, University of Canterbury. Electrical and Computer Engineering, 1998. http://hdl.handle.net/10092/1260.
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Recent advances in power electronics have lead to the wide spread adoption of advanced power supplies and energy efficient devices. This has lead to increased levels of harmonic currents in power systems, degrading the performance of electrical machinery and interfering with telecommunication services. Active filters provide a solution to these problems by compensating for the distorted currents drawn by non-linear loads. Optimal methods for controlling these active filters have been determined by computer simulation and experimental implementation. Methods used for isolating the harmonic content of an unbalanced three phase load current were compared by computer simulations. A technique based on the Fast Fourier Transform (FFT) was developed as part of this work and shown to perform favourably. Notch Filtering, Sinusoidal Subtraction, Instantaneous Reactive Power Theory, Synchronous Reference Frame and Fast Fourier Transform methods were simulated. The methods shown to be suitable for compensation of three phase unbalanced loads were implemented in a Digital Signal Processor to evaluate true performance. These methods were Notch Filtering, Sinusoidal Subtraction, Fast Fourier Transform, and a High Pass Filter based method. A completely digital hysteresis current controller for a three phase active filter inverter has been developed and implemented with a Field Programmable Gate Array. This controller interfaces directly to a digital signal processor and is resistant to electromagnetic interference. Results from the experimental hardware verified that the active filter model used for simulation is accurate, and may be used for further development of harmonic isolation methods. A technique using notch filtering gives the best performance for steady loads, with the FFT based technique giving the most flexible operation for a range of load current characteristics. Novel use of the FFT based harmonic isolation technique allows selective cancellation of individual harmonics, with particular application to multiple shunt filters connected in parallel.
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Zhang, Xuning. "Passive Component Weight Reduction for Three Phase Power Converters." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/47788.
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Over the past ten years, there has been increased use of electronic power processing in alternative, sustainable, and distributed energy sources, as well as energy storage systems, transportation systems, and the power grid. Three-phase voltage source converters (VSCs) have become the converter of choice in many ac medium- and high-power applications due to their many advantages, such as high efficiency and fast response. For transportation applications, high power density is the key design target, since increasing power density can reduce fuel consumption and increase the total system efficiency. While power electronics devices have greatly improved the efficiency, overall performance and power density of power converters, using power electronic devices also introduces EMI issues to the system, which means filters are inevitable in those systems, and they make up a significant portion of the total system size and cost. Thus, designing for high power density for both power converters and passive components, especially filters, becomes the key issue for three-phase converters.
This dissertation explores two different approaches to reducing the EMI filter size. One approach focuses on the EMI filters itself, including using advanced EMI filter structures to improve filter performance and modifying the EMI filter design method to avoid overdesign. The second approach focuses on reducing the EMI noise generated from the converter using a three-level and/or interleaving topology and changing the modulation and control methods to reduce the noise source and reduce the weight and size of the filters.
This dissertation is divided into five chapters. Chapter 1 describes the motivations and objectives of this research. After an examination of the surveyed results from the literature, the challenges in this research area are addressed. Chapter 2 studies system-level EMI modeling and EMI filter design methods for voltage source converters. Filter-design-oriented EMI modeling methods are proposed to predict the EMI noise analytically. Based on these models, filter design procedures are improved to avoid overdesign using in-circuit attenuation (ICA) of the filters. The noise propagation path impedance is taken into consideration as part of a detailed discussion of the interaction between EMI filters, and the key design constraints of inductor implementation are presented. Based on the modeling, design and implementation methods, the impact of the switching frequency on EMI filter weight design is also examined. A two-level dc-fed motor drive system is used as an example, but the modeling and design methods can also be applied to other power converter systems.
Chapter 3 presents the impact of the interleaving technique on reducing the system passive weight. Taking into consideration the system propagation path impedance, small-angle interleaving is studied, and an analytical calculation method is proposed to minimize the inductor value for interleaved systems. The design and integration of interphase inductors are also analyzed, and the analysis and design methods are verified on a 2 kW interleaved two-level (2L) motor drive system. Chapter 4 studies noise reduction techniques in multi-level converters. Nearest three space vector (NTSV) modulation, common-mode reduction (CMR) modulation, and common-mode elimination (CME) modulation are studied and compared in terms of EMI performance, neutral point voltage balancing, and semiconductor losses. In order to reduce the impact of dead time on CME modulation, the two solutions of improving CME modulation and compensating dead time are proposed. To verify the validity of the proposed methods for high-power applications, a 100 kW dc-fed motor drive system with EMI filters for both the AC and DC sides is designed, implemented and tested. This topology gains benefits from both interleaving and multilevel topologies, which can reduce the noise and filter size significantly. The trade-offs of system passive component design are discussed, and a detailed implementation method and real system full-power test results are presented to verify the validity of this study in higher-power converter systems. Finally, Chapter 5 summarizes the contributions of this dissertation and discusses some potential improvements for future work.Ph. D.
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AraÃjo, Renato Guerreiro. "PLL (Phase-Locked Loop) structures for single phase and three phase systems with a high rejection capacity to sub and interharmonic." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15882.
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CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel SuperiorIn applications related to power converters, such as inverters, rectifiers and the use of active filters, the synchronization method represent a very important element in the performance of the control strategy of this equipment. The estimated values of the synchronism angle, frequency and amplitude determined by the synchronization algorithms present, facing strongly distorted signals with the presence of sub and interharmonics, high errors. This study presents two algorithms: one applied on single-phase electrical systems and one applied on three-phase electrical systems, with high immunity to interharmonics and subharmonics. First are presented the main synchronization systems that are used in the electrical power systems. In addition, will be presented the main causes and consequences of the presence of subharmonics and interharmnics in the system, as well as the mathematical modeling of the two algorithms with high rejection to these disturbances. Will be presented the simulation and the experimental results of the proposed algorithms and the comparison between these synchronization methods with particular methods present in the literature. As a result of the study, it can be seen that the proposed structures present a higher response time, but the error of the estimated signal with respect the fundamental component of the input signal is lower when compared to structures such as EPLL and structures based on SOGI. It was observed that the proposed synchronization methods are enabled to estimate the synchronism angle, the frequency and the fundamental component of the input signal adequately and can be used in control strategies of power converters.
Em aplicaÃÃes relacionadas à EletrÃnica de PotÃncia, como inversores, retificadores e a utilizaÃÃo de filtros ativos, o mÃtodo de sincronizaÃÃo representa um elemento chave no desempenho da estratÃgia de controle destes equipamentos. Os valores do Ãngulo de sincronismo, frequÃncia e amplitude estimados com determinados algoritmos de sincronizaÃÃo apresentam, diante de sinais fortemente distorcidos com a presenÃa de sub e inter-harmÃnicos, erros elevados. Neste trabalho sÃo apresentados dois algoritmos: um aplicado a sistemas elÃtricos monofÃsicos e outro aplicado a sistemas elÃtricos trifÃsicos, com elevada imunidade a inter-harmÃnicos e sub-harmÃnicos. Primeiramente sÃo apresentados os principais sistemas de sincronizaÃÃo utilizados em sistemas elÃtricos de potÃncia. AlÃm disso, sÃo apresentadas as principais causas e consequÃncias da presenÃa de sub-harmÃnicos e inter-harmÃnicos no sistema, bem como a modelagem matemÃtica dos dois algoritmos com elevada rejeiÃÃo a estes distÃrbios. SÃo apresentados os resultados de simulaÃÃo e experimentais dos algoritmos propostos e a comparaÃÃo entre estes mÃtodos de sincronizaÃÃo com determinados mÃtodos presentes na literatura. Como resultado do estudo, pode-se observar que as estruturas de sincronizaÃÃo propostas apresentam um tempo de resposta mais elevado, porÃm o erro do sinal estimado em relaÃÃo a componente fundamental do sinal de entrada à inferior quando comparado a estruturas como o EPLL e estruturas baseadas no SOGI. Com isso, tem-se que as mesmas estÃo habilitadas para estimar o Ãngulo de sincronismo, a frequÃncia e a componente fundamental do sinal de entrada adequadamente e podem serem utilizadas eficientemente em estratÃgias de controle de conversores de potÃncia.
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Young, Kurt A. "COMPARATIVE ANALYSES OF MULTI-PULSE PHASE CONTROLLED RECTIFIERS IN CONTINUOUS CONDUCTION MODE WITH A TWO-POLE LC OUTPUT FILTER FOR SURFACE SHIP DC APPLICATIONS." Monterey, California. Naval Postgraduate School, 2013. http://hdl.handle.net/10945/32924.
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The Navy of tomorrow will require a robust and reconfigurable power system capable of supplying power not only to large high power propulsion loads but to growing combat system loads like high power radar and pulse loads such as rail guns and free-electron lasers. A critical component in such a system is the phase controlled rectifier. As such, the issues associated with the inclusion of a power electronics rectifier need to be addressed. These issues include input Alternating Current (AC) interface requirements, the output Direct Current (DC) load profile, and overall stability in the presence of non-linear loads. Understanding these issues and determining the means of assuring compatibility with a Navy all-electric ship is the focus of this thesis. By using a Simulink model of a variable parameter load, several multiple-pulse count, high power rectifiers were exercised. The Simulink results were compared to the linearized small signal transfer function analysis results. These experiments led to the conclusion that increasing the pulse count and output filtering reduces the input interface current distortion. However, there are tradeoffs in terms of complexity and size of the passive components, and optimization based on source and load specifications is required.
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Al, Chaer Toufic. "Robust control of multivariable systems : application to a three-phase shunt active filter in low voltage electrical networks." Poitiers, 2008. http://www.theses.fr/2008POIT2352.
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The work done in this thesis aims to combine the knowledge of two research areas: the automatic control area and the power electronics area, in order to elaborate a methodology for controlling a three-phase shunt active filter system. Indeed, this subject has been widely handled by the specialists in the field of power electronics in order to eliminate voltage and current harmonics in electrical distribution networks. Most of existing control strategies of active filters have been formulated as a current reference tracking control design problem. The alternative approach that we propose is to formulate a three-phase shunt active filter as a linear perturbation rejection problem with zero references. The linearity of the mathematical model enables us to use the H∞ control paradigm in order to design a multivariable linear robust H∞ controller. Such a controller is able to reject harmonics generated by the nonlinear loads, and to maintain the stability and performance of the system against the variations in the physical parameters of the electric circuit. In order to validate the proposed approach, simulations are carried out in Matlab/Simulink environment, and the control laws are implemented on an experimental test benchLe travail effectué dans cette thèse a pour objectif de combiner les connaissances de deux domaines de recherche : l’automatique et l’ électronique de puissance afin de dégager une méthodologie pour contrôler un filtre actif parallèle triphasé. En effet, ce sujet est largement traité par les spécialistes de l’électronique de puissance pour éliminer les harmoniques de tension et de courant sur un réseau de distribution électrique. La plupart des stratégies de commande sont basées sur la formulation du problème du filtrage actif comme un problème de suivi de consignes classiquement utilisé dans ce domaine. L’ approche que nous proposons est de considérer le problème comme un problème linéaire de rejet de perturbations. La modélisation linéaire du système permet la synthèse d’une loi de commande robuste multivariable en vue d’ une stabilisation robuste et d’ une performance H∞ robuste. Cette loi de commande devra permettre d’ éliminer les harmoniques qui apparaissent sur le réseau, et de maintenir la stabilité et la performance du système vis-à-vis les incertitudes sur les paramètres du modèle. La validité de l’ approche proposée est vérifiée en simulation à partir de l’ outil logiciel Matlab/Simulink, puis par la mise en œuvre sur un banc expérimental
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Demirkutlu, Eyyup. "Output Voltage Control Of A Four-leg Inverter Based Three-phase Ups By Means Of Stationary Frame Resonant Filter Banks." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608151/index.pdf.
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A method for high performance output voltage control of a four-leg inverter based three-phase transformerless UPS is proposed. Voltage control loop is employed and the method employs stationary frame resonant filter controllers for the fundamental and harmonic frequency components. A capacitor current feedback loop provides active damping and enhances the output voltage dynamic performance. The
controller design and implementation details are given. Linear and nonlinear loads for balanced and unbalanced load operating conditions are considered. The steadystate
and dynamic performance of the UPS are investigated in detail. A scalar PWM method with implementation simplicity and high performance is proposed and implemented. The control and PWM methods are proven by means of theory,
simulations, and experiments.
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Junior, Edson Luis Geraldi. "Parameter estimation for a three-phase distributed synchronous generator model using noisy measurements." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-19102018-143704/.
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The simplified models of synchronous generators, widely used in stability studies of large electric power systems, are not completely suitable for the stability analysis and the design of controllers of distributed synchronous generators, generally connected to typically unbalanced branches. To more accurately analyze the systems with distributed generation, it is necessary to utilize synchronous generator models that consider frequency variation in their electrical equations. Furthermore, this model must represent possible unbalanced three-phase voltages at the generator terminals as well. Nonetheless, to provide reliable responses, the parameters of this more detailed model should be known. Thus, this work assesses the influence of the parameters on the responses of a detailed synchronous generator model, suitable to depict unbalanced operating conditions, and proposes an approach for the estimation of its most important parameters. In the proposed structure, we first employ Trajectory Sensitivity Functions to evaluate the dependency of the responses of this model with respect to its parameters and, from that, we rank them according to their importance. Subsequently, we apply an estimation process that utilizes the Unscented Kalman Filter with the aid of a genetic algorithm to estimate the main parameters of this synchronous generator model under unbalanced operating conditions. To obtain the results and, therefore, assess the proposed estimation approach, we make use of a system which comprises a synchronous generator connected to a three-phase unbalanced load. In addition to the unbalanced operation of the test system, we also consider noises due to the constant load switching, typical of distribution systems. The estimations performed for three operating conditions of the generator were very satisfactory, which demonstrates the efficiency of the proposed approach to obtain adequate models for the description of synchronous generator operation under unbalanced operating conditions.Os modelos simplificados de geradores síncronos, amplamente utilizados em estudos de estabilidade de grandes sistemas elétricos de potência, não são completamente adequados para a análise de estabilidade e projetos de controladores dos geradores síncronos distribuídos, geralmente conectados a sistemas tipicamente desequilibrados. Para que os sistemas com geração distribuída possam ser analisados mais fidedignamente, é necessária a utilização de um modelo de gerador síncrono que considere a variação de frequência em suas equações elétricas. Além disso, esse modelo também deve ser capaz de representar possíveis tensões trifásicas desequilibradas nos terminais do gerador. Entretanto, para que esse modelo mais detalhado possa fornecer respostas coerentes com a realidade, deve-se conhecer seus parâmetros. Dessa forma, este trabalho avalia a influência dos parâmetros nas respostas de um modelo de gerador síncrono mais detalhado, adequado para representar operações desbalanceadas, e propõe uma abordagem para a estimação de seus parâmetros mais importantes. Nessa estrutura, inicialmente empregam-se as Funções de Sensibilidade de Trajetória para avaliar a dependência das respostas desse modelo em relação aos seus parâmetros e, a partir disso, ordená-los conforme sua importância. Em seguida, aplica-se um processo de estimação que utiliza o Filtro de Kalman Unscented com o auxílio de um algoritmo genético para estimar os principais parâmetros desse modelo de gerador síncrono em condições de desbalanço. Para a obtenção dos resultados e consequente avaliação da abordagem de estimação proposta, utiliza-se um sistema composto por um gerador síncrono conectado a uma carga trifásica desbalanceada. Além da operação desbalanceada desse sistema teste, também são considerados ruídos devidos ao constante chaveamento de cargas, típicos de sistemas de distribuição. As estimações realizadas para três condições de operação do gerador foram bem satisfatórias, indicando a eficiência da abordagem proposta na obtenção de modelos adequados para descrever a operação de geradores síncronos em condições de desbalanço.
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Lee, Shane-Woei. "A carrier phase only processing technique for differential satellite-based positioning systems." Ohio : Ohio University, 1999. http://www.ohiolink.edu/etd/view.cgi?ohiou1181175000.
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Cetin, Nebi Onur. "Design And Implementation Of Advanced Pulse Width Modulation Techniques And Passive Filters For Voltage Source Inverter Driven Three-phase Ac Motors." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612236/index.pdf.
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Advanced pulse width modulation (PWM) techniques such as space vector PWM, active zero state PWM, discontinuous PWM, and near state PWM methods are used in three-phase AC motor drives for the purpose of obtaining low PWM current ripple, wide voltage linearity range, and reduced common mode voltage (CMV). In some applications, a filter is inserted between the inverter and the motor for the purpose of reducing the stresses in the motor. The motor current PWM ripple components, terminal voltage overshoots, shaft voltage, and bearing currents, etc. can all be reduced by means of PWM techniques and passive filters. Various PWM techniques and passive filter types exist. This thesis studies the combinations of PWM techniques and filters and evaluates the performance of the motor drive in terms of the discussed stresses in the motor. PWM techniques are reviewed, a generalized algorithm for the implementation of PWM techniques is developed, and implementation on a 4 kW rated drive is demonstrated. Filter types are studied, among them the common mode inductor and the pure sine filter (PSF) configurations are investigated in detail. Filters are designed and their laboratory performance is evaluated. In the final stage the advanced PWM techniques and filters are combined, the incompatibility problem of discontinuous PWM methods with the PSF is illustrated. A cure based on rate of change limiter is proposed and its feasibility proven in the laboratory experiments. With the use of the proposed PWM algorithm and PSF, a motor drive with ideal DC to AC conversion stage (DC to pure sine) is achieved and its performance is demonstrated in the laboratory.
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Sakr, Nadim. "Fast on-board integrated chargers for electric vehicles." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC045.
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L'autonomie moyenne des voitures électriques commercialisées actuellement reste limitée par rapport aux véhicules thermiques. Pour pallier ce problème, la capacité de la batterie peut être augmentée ou bien la charge peut être facilitée en réduisant le temps de charge et ceci en augmentant la puissance de charge.L'infrastructure de charge rapide de type DC étant encore limitée, un progrès considérable consiste à embarquer le chargeur dans le véhicule en réutilisant tout, ou une partie de l'électronique de puissance déjà disponible pour propulser le véhicule. Le chargeur est alors nommé chargeur intégré.Au cours des dernières années, plusieurs chargeurs intégrés ont été proposés, mais peu d'entre eux ont été industrialisés vue qu'ils présentent des inconvénients que l'on cherchera à surmonter ou réduire.Dans le cadre de cette thèse notre objectif principal est donc de concevoir une nouvelle topologie de convertisseur permettant la charge de la batterie à moindre coût.Plusieurs idées permettant l'innovation sont proposées et une solution répondant au mieux au cahier de charges est retenue. Cette topologie est étudiée en détails (contrôle, dimensionnement, harmoniques, CEM, etc.). Finalement un prototype est réalisé pour valider le concept proposéTo date, the range autonomy of most electric vehicles is still lower than conventional fuel based vehicles and charging times are significantly longer. To overcome this problem, battery capacity could be increased but more importantly high power fast charging should be accessible everywhere.The widespread deployment of public DC fast charging stations is still difficult to achieve. So, in order to have a better spreading of the charge spots and a better coverage, it is also necessary for the vehicle to be charged from an on-board charger that could be plugged into three-phase AC power outlets.Furthermore, because the battery is charged only when the car is parked -except for regeneration at braking-, using the on-board traction system components to form an integrated charging device is possible. This kind of topology is called an integrated charger which allows designing a charger small enough to be embedded in a vehicle at an affordable cost.Several non-isolated on-board integrated charging topologies are proposed in this thesis and the one that best meets some predefined specifications is selected. This topology is studied in details and validated by simulation software. A laboratory prototype is also built to verify the performance of this multi-purpose traction/charger converter
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Nishioka, Julio Kendi. "Sistema de controle digital para retificador trifásico a quatro fios com filtro LCL." Universidade do Estado de Santa Catarina, 2011. http://tede.udesc.br/handle/handle/1913.
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Previous issue date: 2011-08-25Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
This dissertation proposes a digital control system for a three-phase four-wire high input power factor PWM rectifier with LCL filter. The proposed control system includes an inner control loop for active damping of the LCL filter peak resonance, which uses a lead-lag compensator. In addition, the control system presents an independent current loop for each rectifier phase, which employs resonant compensators tuned at the fundamental frequency of the utility grid voltage. Finally, other two outer loops are used to maintain the voltages across the dc bus capacitors regulated and balanced. This work also proposes a design methodology to obtain the parameter of the LCL filter, which is based on maximum harmonic currents allowed by technical standards and on the minimization of the reactive energy of the LCL filter capacitors. Simulation and experimental results are presented to validate the developed analysis and demonstrate the performance of the proposed controllers.
Esta Dissertação de Mestrado propõe um sistema de controle digital para um retificador PWM trifásico a quatro fios com filtro LCL e elevado fator de potência de entrada. O sistema de controle proposto inclui uma malha interna de amortecimento ativo do pico de ressonância do filtro LCL, fazendo uso de um compensador em avanço. Além da malha de amortecimento ativo, o sistema de controle apresenta uma malha de corrente independente para cada fase do retificador, as quais empregam compensadores ressonantes sintonizados na frequência fundamental da tensão de entrada. Por fim, outras duas malhas externas são utilizadas para manter as tensões dos capacitores que compõem o barramento CC reguladas e equilibradas. Este trabalho também propõe uma metodologia de projeto para os parâmetros do filtro LCL, a qual é baseada nos limites máximos de harmônicos de corrente permitidos pelas normas e na minimização da energia reativa do capacitor do filtro LCL. Resultados de simulação e experimentais são apresentados para validar as análises desenvolvidas e demonstrar o desempenho dos controladores propostos.
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Štaffa, Jan. "Jednofázový pulzní měnič DC/AC s digitálním řízením." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217881.
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This work is focused on single phase inverters, which are used for the conversion of the direct current to the alternating current and are nowdays used especially in systems of back-up power supply. The specific aim of this work is implementation of design hight power circuit of inverter include calculation of control algorithm. It describes the complete solution of power circuit. Next step is a analysis of problems concerning the digital control with help of signal processor which is used for solution of regulator structure. Check of the design and checkout of control algorithm is made in the form of simulation in the MATLAB Simulink. Debugged program algorithm is subsequently implemented into the signal microprocessor. The work results rate estimation functionality of inverter and solution of control algorithm.
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Pazdera, Ivo. "Průmyslové čerpadlo s integrovaným elektromagnetickým systémem." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-233600.
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This work is focused on innovative construction of the industrial radial sealless pump and mainly on construction of the three phase DC/AC converter based on new semiconductor technology SiC. These new semiconductor devices allow move switching frequency up to 100 kHz. For such high switching frequency new non-conventional topology of the output filter was designed. This high frequency is currently unusual in three-phase application with output voltage 400V. High switching frequency reduces size of wound components of the output filter and its presence is accepted in terms of total weight and price of the whole system. Clear sinus waveform of the output converter voltage reduces torque ripple, EMC and extend the lifetime and reliability of mechanical parts and the whole pump drive. Three phase synchronous motor is directly placed into the pump body and is designed as slotless motor. In the inlet area is the classical bearing replaced by active magnetic bearing. It is used due to possibility to pump aggressive liquids or substances where high level of cleanness has to be guaranteed.
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Pahmer, Sueda Carmen M. "Contribution à l'étude de filtres actifs de puissance de type shunt : commande-simulation." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0080.
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Le travail presente consiste a etudier de maniere detaillee les algorithmes de commande d'un filtre actif de puissance de type shunt realise a partir d'un onduleur de tension connecte sur un reseau triphase de puissance finie. Ces algorithmes ont ete testes en simulation a l'aide du logiciel a usage general electro-magnetic transients program (emtp). A ce propos, cinq methodes distantes pour obtenir les courants de reference pour chaque phase de l'onduleur de tension ont ete formalises. De la meme maniere, la regulation de tension aux bornes du condensateur de cet onduleur a egalement ete abordee. Dans certains cas de figure la numerisation controle-commande a ete developpe de maniere a simuler des structures les plus proches possibles de la realite. Quelques resultats experimentaux obtenus a l'aide d'un filtre actif de commande numerique permettent de valider notre methodologie
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Pan, Kuan-Yu, and 潘冠羽. "Three-Phase Distance Matrices Filter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/69535594489154996043.
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碩士國立臺北教育大學
資訊科學系碩士班
95
In this thesis, a new noise filtering, Three-phase Distance Matrices Filter (TPDMF), for restoration of corrupted image by impulsive noise is presented. Whether Image was attacked by randomly valued impulse or constant value impulse, this method can restore corrupted image fast and effectively without iterative procedure. For avoid over smoothing after filtering, TPDMF use distance matrices to preserve edge and detail of image. TPDMF consists of three phase: impulse detection, impulse verification and impulse noise cancellation. Impulse detection phase will pick up alleged pixels. It will be verified that it is impulse or not in second phase. Finally, the impulse noise will be replaced by estimated value. This algorithm use concept of distance matrices that was consist of median distance matrices and POI distance matrices produced by each pixel. It can be used to preserve image details, judge impulse and calculate parameters that use for restore image. In addition, this paper also propose new dynamic median concept. Result from computer simulation show that TPDMF provides a signification improvement over many other existing techniques.
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Chien, Yuan-Bor, and 簡源伯. "Study of Three Phase Active Power Filter." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/09929416146281120884.
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碩士國立雲林科技大學
電機工程系碩士班
89
As various of solid-state converters are found in a wide variety of end-use applications, voltage distortion and current harmonics produced by power electronics equipment has become a serious problem to be solved in many countries. Recently, active power filter appears to be an attractive method and is employed to replace the conventional passive LC filter for improving power quality. They are classified into shunt APF, series APF, combination of shunt and series APF, and hybrid APF. In this thesis, the basic compensation principles and control algorithms of these APFs are studied and analyzed. At last, simulations are made to confirm the validities of the control algorithm for these active power filters.
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Kong, Shi-Qi, and 孔詩琦. "Conducted EMI Filter Design of Three-phase Converters." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/fk2962.
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Hedayati, Mohammad Hassan. "Integrated CM Filter for Single-Phase and Three-Phase PWM Rectifiers." Thesis, 2015. http://etd.iisc.ernet.in/2005/3947.
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The use of insulated-gate bipolar transistor (IGBT)-based power converters is increasing exponentially. This is due to high performance of these devices in terms of efficiency and switching speed. However, due to the switching action, high frequency electromagnetic interference (EMI) noises are generated. Design of a power converter with reduced EMI noise level is one of the primary objectives of this research.
The first part of the work focuses on designing common-mode (CM) filters, which can be integrated with differential-mode (DM) filters for three-phase pulse-width modulation (PWM) rectifier-based motor drives. This work explores the filter design based on the CM equivalent circuit of the drive system. Guidelines are provided for selection of the filter components. Different variants of the filter topology are evaluated to establish the effectiveness of the proposed topology. Analytical results based on Bode plot of the transfer functions are presented, which suggest effective EMI reduction. Experimental results based on EMI measurement on the grid side and CM current measurement on the motor side are presented. These results validate the effectiveness of the filter.
In the second part of the work, it is shown that inclusion of CM filters into DM filters results in resonance oscillations in the CM circuit. An active damping strategy is proposed to damp the oscillations in both line-to-line and line-to-ground ac voltages and currents. An approach based on pole placement by state feedback is used to actively damp both the DM and CM filter oscillations. Analytical expressions for state-feedback controller gains are derived for both continuous-and discrete-time models of the filter. Trade-off in selection of the active damping gain on the lower-order grid current harmonics is analysed using a weighted admittance function method.
In the third part of the work, single-phase grid-connected power converters are considered. An integrated CM filter with DM LCL filter is proposed. The work explores the suitability of PWM methods for single-phase and parallel single-phase grid-connected power converters. It is found that bipolar PWM and unipolar PWM with 180◦interleaving angle are suitable for single-phase and parallel single-phase power converters, respectively. The proposed configuration along with the PWM methods reduces the CM voltage, CM current, and EMI noise level effectively. It is also shown that the suggested circuit is insensitive to nonidealities of the power converter such as dead-time mismatch, mismatch in converter-side inductors, unequal turn on and turn off of the switches, and propagation delays.
In the fourth part of the work, the inter-phase inductor in parallel interleaved power converters is integrated with LCL filter boost inductor. Different variant designs are presented and compared with the proposed structure. It is shown that the proposed structure makes use of standard core geometries and consumes lesser core material as well as copper wire. Hence, it reduces the overall size and cost of the power converter.
In the present work, a 10kVA three-phase back-to-back connected with input LCL filter and output dv/dt filter, a 5kVA single-phase grid-connected power converter with LCL filter, and a 7.5kVA parallel single-phase grid-connected power converter with LCL filter are fabricated in the laboratory to evaluate and validate the proposed methods. The experimental results validate the proposed methods that result in significant EMI performance improvement of grid-connected power converters.
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Chen, Po-Shen, and 陳柏燊. "Conductive EMI Filter Design for Single-phase Converter and Three-phase Inverter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/2aq8kn.
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博士國立臺北科技大學
電機工程系研究所
99
The objective of this dissertation is to develop the conductive EMI filters for single-phase converter and three-phase inverter. First, the presented software-based separation method is developed. In single-phase converter or three-phase inverter, the LISN (Line Impedance Stabilization Network), which is with single-terminal output socket, is applied to EMI measurement and separation of common mode and differential mode components. The common mode noise and differential mode noise separation is performed using software written in LabVIEW. The single-phase converter and three-phase inverter used are as the EUT and the conductive EMI filters are designed using the corner frequency method presented previously. However, this approach does not consider the frequency dependency of common mode choke. Measured results demonstrate that the high frequency noise can’t be suppressed effectively using the EMI filter designed based upon previous method. Thus, the dissertation proposes a new conductive EMI filter design method based upon software conductive noise separation method. Analytic forms of conductive EMI filter derived by regarding the conductive EMI noise source as either voltage source or current source will be included in this dissertation. The required attenuation level for the filter design is determined by the measured noise, common mode noise, differential mode noise and the related limit line. The presented method determines common mode choke and differential mode choke based upon the required impedance of attenuate the noise. The over-voltage and ringing at the motor terminals of an inverter-fed ac motor drive system, created from pulse width modulation (PWM) along with long power cable. The related EMI caused by long cable issue is also investigated and EMI filters are designed. Experimental results confirm that the proposed EMI filter method applied to both single-phase converter and three-phase inverter can effectively suppress the EMI noise and meet the related conductive EMI standard.
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Wel, Tsung-Kuan, and 欉冠維. "Development Of Three Phase Multi-level Active Power Filter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/97889499763964823611.
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碩士聖約翰科技大學
電機工程系碩士班
96
With the proliferation of nonlinar loads as diode/thyristor restifiers, nonsinusoidal currents degrade power quality in power transmission/distribution systems. Harmonics in power systems are becoming a serious problem for both utilities and customers. An active power filter using power electronic technology can reduce harmonics and improve power factor simultaneously. In this thesis, a feasibility study of shunt three-level power active filter is reported. Based on the traditional hysteresis current control switching technology for pulse width modulation scheme, a natural-point-clamp (NPC) structure is adapted. Compared with two-level inverters, three-level inverters have half the voltage stress on switching devices for the same dc-link voltage, and generate lower harmonics at the same switching frequency. The proposed three-level shunt active power filter is implemented and the experimental results verify the feasibility of the system and the correction of related analysis.
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Ai, Wen-Jei, and 艾文傑. "Development of Three Phase Multi-Function Active Power Filter." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/38925607280339893630.
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碩士中原大學
電機工程研究所
89
The object of this thesis is to develop a multi-functional active power filter (APF) that can be multi-module parallel operation. The functions include compensation of the load current harmonics, reactive power and three-phase unbalanced currents aiming that the input currents are balanced with low distortion and the input power factor is unity. As for the control method, the synchronous-frame-based algorithm for reactive power compensation combined with the band-pass filter for harmonic current calculation is adopted for achieving a better filtering performance under the distorted voltage supply. A real power compensation technique is also proposed for balancing the unbalanced load currents. The cascaded series load current sensing method accompanying with the capacity-limitation control (including the reactive power capacity, harmonic current amplitude and unbalanced load power limitations) is employed to make multiple APFs can be paralleled without any control interconnection. A 3KVA APF system is implemented, the effectiveness of the proposed methods are proved in terms of some EMTP simulation and experimental results.
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Liu, Tai-Yu, and 劉泰佑. "Study of a High Performance Three-phase Active Power Filter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/55110394733457921353.
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碩士國立宜蘭大學
電機工程學系碩士班
95
A high performance three-phase active power filter is proposed in this thesis. A novel circuit for detecting the amplitude of the active part of the fundamental load current is also proposed. The detection time of the circuit is not more than cycle. Its transient response is superior to the other conventional techniques. Besides, the proposed algorithm avoids the use of mains voltage signal in the calculation of reference compensation current. Therefore, the mains current after compensation still has a purely sinusoidal waveform even when the mains voltage is distorted. In addition, a simple control scheme, based on the energy balance concept, is proposed to control the voltage of an energy-storage capacitor. The advantages of the proposed active power filter are small size and fast transient response. Furthermore, the proposed active power filter can compensate the current harmonics, improve the power factor and balance the imbalance load. Finally, the performance of the active power filter is demonstrated by simulation as well as experimental results.
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Lam, Ka-Lok, and 林嘉樂. "Study on Power Balance for Three-Phase Active Power Filter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/d4kcvn.
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碩士國立交通大學
電機工程學系
106
This thesis is presented how three-phase shunt active power filter improve the current distortion caused by the non-linear load, and through its control system to solve the current unbalance and phase fault between three-phase power system. And also discuss when the energy combined to the three-phase power network, how to improve power factor, compensate reactive power at the same time, in another way, when phase fault or current unbalance in system, how system keeping output current normally. For the control method, through the line voltage signal feedback and digital phase-locked loop, system can track the phase voltage correctly , the traditional multi-loop feedback control include the DC bus voltage control and output current control, with the DC voltage feedback and input current feedback and, the active power filter can compensate reactive power and compensate improve power factor, also can keeping output current when phase fault happening in power source. Finally, the proposed control system is implemented in Texas Instruments DSP TMS320F28335 chip to realize the three-phase shunt active power filter control, and the provided simulation and experimental results shows that well performance of the target.
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Xiao, Shun-Tian, and 蕭順天. "The Implementation of Three-Phase Multi-Level Hybrid Power Filter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/80503872100660609471.
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碩士國立高雄應用科技大學
電機工程系
97
The operation of irregular or nonlinear related equipment will generate a significant current harmonics, and the current harmonics may pollute the distribution power system and cause the poor power quality. So that many equipment is used to solve the problems of harmonic conventionally. The hybrid power filter has the advantages of active power filter and passive power filter. This paper proposed a three phase hybrid power filter implemented by a multilevel inverter. The inverter is configured by a diode clamped multilevel structure has advantages of low stress voltage on power switch device. So that it was promoted to be applied in high voltage and high power rating applications. However, diode clamped multilevel inverter had the drawback of DC voltage unbalance. This paper proposes a dc voltage regulation loop to improve the DC voltage unbalance of diode clamped multilevel inverter three phase hybrid power filter. To verify the performance of three-phase multilevel hybrid power filter system, the computer simulation is carried out and hardware prototypes are developed and tested. Both simulation and experimental results verify that the performance of the proposed three-phase multilevel hybrid power filter system is as expected.
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Zhan, Hong-Bin, and 詹弘彬. "Implementation of IEEE Standard 1459-based Three-phase Three-wire Shunt Active Power Filter." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/pd854h.
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碩士國立中正大學
電機工程研究所
107
With the advanced of power electronics technology and renewables integrated into the network, harmonics pollution caused by power electronic devices, such as power converters, rectifiers, uninterruptible power systems (UPS), etc., is increasing in power system. Harmonics are harmful to many power equipment and cause extra power loss. Therefore, how to mitigate the harmonics and maintain reliable and stable power quality is an important subject. The active power filter is the most effective and achievable way for harmonics mitigation. The harmonic detection, current control of the active filter determine whether it can effectively suppress harmonic and compensate reactive power. Therefore, this thesis proposes a method of equivalent fundamental positive-sequence voltage based on IEEE standard 1459 as harmonic current detection method of three-phase three-wire shunt active power filter. In the proposed method, even when the source voltage is distorted, the source current is maintain sinusoidal and in phase with the source voltage after compensation. And combined with proportional-resonant (PR) controller, specific harmonic elimination, the inverter is then controlled by space vector pulse width modulation (SVPWM) with low switching loss and low output harmonics. To validate the performance of IEEE Standard 1459-based reference compensation current strategy of three-phase shunt active power filter, MATLAB/SIMULINK system modeling and simulation have been carried out, choosing TMS320F28335 DSP as control chip and hardware prototypes are developed and tested. Both simulation and experimental results show that the performance of the proposed three-phase three-wire active power filter is well verified.
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Tsai, Cheng-Hung, and 蔡政宏. "A Novel Design of Three-Phase Voltage-Controlled Active Power Filter." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/68762046490495792168.
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碩士國立成功大學
電機工程學系
88
With the fast development of high technology, the quality of supplying power is increasingly concerned nowadays. An active filter that owns the functions of harmonic current compensation and power factor correction is thus proposed in this thesis. With this designated filter, it not only accomplishes harmonic compensation and power factor correction, but also significantly improves electric power quality. Moreover, the proposed voltage-controlled active power filter is seen to be superior to current-controlled active power filter as it is more effective in electric power quality improvement at demand-side. In order to achieve a better circuit response, a new phase-shift circuit is also implemented with the active filter circuit in this thesis. The experimental results confirmed the proposed circuit, thereby revealing the usefulness of the proposed method for electric power quality applications.
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Hung, Shao-En, and 洪紹恩. "Design of FPGA-Aided Three-Phase Voltage Controlled Active Power Filter." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/20874091590258376944.
Full textAbstract:
碩士國立成功大學
電機工程學系
89
A voltage-controlled active power filter is able to enhance the power quality at the load side. In this thesis, the FPGA-aided three-phase voltage-controlled active power filter is proposed such that harmonic current compensation and power factor improvement are both achieved. By use of the FPGA, following the conversion of analog to digital signals, it can program the digital controller function with a higher flexibility. Moreover, with the FPGA approach, the design of hardware circuit can be better implemented and the test work can be performed more efficiently. The proposed method has been tested through various scenarios. From experimental results, they have shown the feasibility and practicality of the method for electric power quality applications.
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Yu, Jin-Hao, and 游俊豪. "Design and implementation of a digital three phase active power filter." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/89495382317158999886.
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碩士清雲科技大學
電機工程研究所
93
This paper is concerned with design and implementation of a three phase digital active power filter to solve the current harmonic problem and improve the power factor in the power system. This filter was shunted with nonlinear load. According the instantaneous power theory, the d-q coordinate frame was used to find the harmonic components of load current. Then, the hysteresis current controller and predictive current controller were adopted to produce a compensation current by DC-AC converter. The Matlab-simulink was used to construct the system model, through the simulation result to verify the theorem, then to design a 1kVA rated experimental prototype. All of the calculation was completed by digital signal processor (DSP). This will increase the reliability of the system. According the simulation and experimental results, we can justify that this filter can solve the harmonic and improve power factor.
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HSING, HSIEH CHEN, and 謝禎行. "Development of Shunt-Type Three-Phase Active Power Filter with Adaptive Control." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/33528165276159310525.
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碩士國立臺灣科技大學
電機工程系
90
A new adaptive filter is proposed in this thesis. It combines instantaneous reactive power compensation technology and controller with current predict theory so that this system is characterized by low harmonic distortion，high power factor and small variation of dc-link voltage during load disturbance. The performance of the system is first simulated by digital computer, and the possibility of adaptive digital low pass filter eliminating current harmonic is confirmed in steady and transient state. Then, a digital personal computer is used to implement the active power filter. The results indicate that under rated operation of 3kVA, the system possesses a total harmonic distortion of current less than 5.0%, a power factor of 1.0 on the utility side. It validates that the transient performance of adaptive filter is superior to traditional digital low pass filter and is more economical of short computation time than other type of adaptive filters.
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Chiang, Wen-Jung, and 蔣文榮. "The Study and Implementation of Three-Phase Four-Wire Active Power Filter." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/82861462962035488475.
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碩士國立高雄應用科技大學
電機工程系碩士班
93
Three-phase four-wire distribution power systems have been widely used in office buildings and distribution power system. The loads connected to the three-phase four-wire active power filter may be either single-phase or three-phase loads. If the loads are unbalanced, and the unbalanced load current also flows in the neutral conductor. Moreover, the nonlinear loads have been used widely recently. Conventionally, passive power filters were conventionally used to solve the problem of harmonic pollution, however, they have some disadvantages. Hence, some power electronic based active power facilities have been developed to improve harmonics, recently. At the same, time it can supress harmonic and improve power factor simultaneously. Firstly, the analysis of the Zig-Zag transformer to attenuate the neutral current of the three-phase four-wire distribution power system is carried out. Then, a three-phase four-wire power filter comprising a three-phase three-wire active power filter and a Zig-Zag transformer is developed. However, the performance of this three-phase four-wire power filter is not good in attenuating the neutral current under the nonideal utility voltage conditions. Thus, a simplified control method for the four-leg three-phase four-wire active power filter method is proposed. Furthermore, the computer simulation and a hardware prototype are developed and tested to verify the performance of the Zig-Zag transformer, the three-phase four-wire power filter comprising a three-phase three-wire active power filter and a Zig-Zag transformer three-phase four-wire active power filter, and a four-leg three-phase four-wire active power filter.
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Huang, Zai, and 黃在. "Digital differential relay for a three-phase transformer based on kalman filter." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/32352011319285822865.
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Jhan, Jing-Jhu, and 詹景竹. "Study of a Soft-Switching Three-Phase Voltage-Doubler Active Power Filter Based on FPGAStudy of a Soft-Switching Three-Phase Voltage-Doubler Active Power Filter Based on FPGA." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/65112992714005814959.
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碩士國立宜蘭大學
電機工程學系碩士班
98
This thesis presents a filed programmable gate array (FPGA)-based control circuit for controlling the soft-switching three-phase voltage-doubler active power filter. A low cost four main switches and four auxiliary switches power converter configuration of the active power filter is proposed. All main switches in the proposed soft-switching active power filter operate at zero-voltage-switching (ZVS) turned-on. Also, the auxiliary switches operate at zero-current-switching (ZCS) turned-off. The reduction in the number of switches can also increase the reliability, since the control circuits are thereby reduced to two sets. Moreover, the proposed soft-switching active power filter can compensate the current harmonics, improve the power factor and balance the unbalanced load. In addition, a simple feedforward control, based on the energy balance concept is proposed to control the voltage of an energy-storage capacitor. Because the energy change in the energy-storage capacitor can be fast compensated, a small energy-storage capacitor is required. The advantages of the proposed active power filter are low cost, small size and fast transient response. Finally, some simulation and experimental results are presented for verification.
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Almardy, Mohamed S. M. "Three-phase high-frequency transformer isolated soft-switching DC-DC resonant converters." Thesis, 2011. http://hdl.handle.net/1828/3594.
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There is an increasing demand for power converters with small size, light weight, high conversion efficiency and higher power density. Also, in many applications, there is a need for dc-to-dc converters to accept dc input voltage and provide regulated and/or isolated dc output voltage at a desired voltage level including telecommunications equipment, process control systems, and in industry applications.
This thesis presents the analysis, design, simulation and experimental results of three-phase high-frequency transformer isolated resonant converters. The first converter presented is a three-phase LCC-type dc-dc resonant converter with capacitor output filter including the effect of the magnetizing inductance of the three-phase HF transformer. The equivalent ac load resistance is derived and the converter is analyzed by using approximation analysis approach. Base on this analysis, design curves have been obtained and a design example is given. Intusoft simulation results for the designed converter are given for various input voltage and for different load conditions. The experimental verification of the designed converter performance was established by building a 300 W rated power converter and the experimental results have been given. It is shown that the converter works in zero-voltage switching (ZVS) at various input voltage and different load conditions.
A three-phase (LC)(L)-type dc-dc series-resonant converter with capacitive output filter has been proposed. Operation of the converter has been presented using the operating waveforms and equivalent circuit diagrams during different intervals. An approximate analysis approach is used to analyze the converter operation, and design procedure is presented with a design example. Intusoft simulation results for the designed converter are given for input voltage and load variations. Experimental results obtained in a 300 W converter are presented. Major advantages of this converter are the leakage and magnetizing inductances of the high-frequency transformer are used as part of resonant circuit and the output rectifier voltage is clamped to the output voltage. The converter operates in soft-switching for the inverter switches for the wide variations in supply voltage and load and it requires narrow switching frequency variation (compared to LCC-type) to regulate the output voltage.
A three-phase high-frequency transformer isolated interleaved (LC)(L)-type dc-dc series-resonant converter with capacitive output filter using fixed frequency control is proposed. The converter operation for different modes is presented using the operating waveforms and equivalent circuit diagrams during different intervals. This converter is modeled and then analyzed using the approximate complex ac circuit analysis approach. Based on the analysis, design curves were obtained and the design procedure is presented with a design example. The designed converter is simulated using PSIM software to predict the performance of the converter for variations in supply voltage and load conditions. The converter operates in ZVS for the inverter switches with minimum input voltage and loses ZVS for two switches in each bridge for higher input voltages.Graduate
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Kha, Nguyen Tung, and 阮松佧. "A Hybrid Approach for Optimal Control of Three-Phase Shunt Active Power Filter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ue646z.
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碩士國立中正大學
電機工程研究所
106
A shunt active power filter (SAPF) is used to cancel the harmonic current and compensate the reactive power. Under the non-ideal source voltage conditions, the complete elimination of harmonics and near unity power factor simultaneously cannot be achieved. Besides, controlling the SAPF output current aims to (1) control switching harmonics, (2) lower power loss, (3) stabilize the system under changing dynamic load conditions, and (4) reduce the steady-state error. Hence, a hybrid approach for determining the optimal SAPF reference compensating current and optimally controlling the three-phase four-wire SAPF output current is presented in this thesis. This optimal control combination achieves the maximum power factor while the source current harmonics, THD and IHDs, are within the allowable limits of the IEEE Standard 519, as well as the least power loss and switching harmonic. Simulation of the system with the proposed hybrid approach is performed in MATLAB/Simulink and RT-LAB programs. The results show that the proposed method is more effective than traditional approaches in compensating harmonic current and reactive power, reducing power loss, and computing time.
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Liu, Ming-Tai, and 劉銘台. "Power Control and LCL Filter Design for Three-Phase Grid-Connected PV System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/55603650581678945847.
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碩士明志科技大學
電機工程系碩士班
102
The major object of this research is to implement a three-phase gird-connected PV system with the power decoupled control. The system integrates with dc to dc converter, dc to ac converter, and LCL filter, and the system also have implemented a three-phase synchronous-reference frame digital phase-lock-loop (DPLL) and three-phase grid-connected power decoupled control. The major structure of three-phase synchronous-reference frame DPLL includes Clark、Park transformation, and DPLL. The Clark transfers grid voltage to two phase orthogonal voltage v_α and v_β, then the Park transfers the two phase orthogonal voltage to two orthogonal voltage v_d and v_q, finally the amplitude, frequency, and phase angle of the grid voltage can be obtained by DPLL. In adding the current i_α and i_β transferred by Clark transformation of grid current, the active power and reactive power can be calculated by the parameters v_α,v_β, i_α,and i_β. Furthermore, the active power and reactive power are controlled by proportional-integrated control loop and the power decoupling control is achieved by inverse Park and inverse Clark transformation. The switching strategy of the voltage-source inverter (VSI) is a unipolar sine pulse width modulation (SPWM).The SPWM technique will cause the high order harmonics in the output voltage. Moreover, the dead time also causes the odd order harmonics. In this research, LCL filters are designed to attenuate those harmonics. A three-phase LCL filter is designed to meet the interconnection standard requirement.
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Huang, Yung Fu, and 黃永福. "Appications of series active filter systems in three-phase four-wire distribution systems." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/74913410317683969771.
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碩士國立清華大學
電機工程學系
89
Three-phase four-wire distribution systems have been widely used in commercial and industrial facilities. And due to the rapid growth of consumer electronics products and power electronics converters in recent years, the resulting harmonics problem has become increasingly serious. In particular the zero sequence ($3^{rd},9^{th}$,...) harmonics current drawn by these nonlinear load accumulates in the neutral conductor and leads to overloading problems on the neutral conductor and the distribution transformer. Such overloading problems raise serious safty concerns. Most of the existing solutions only reduce the overloading in part of the neutral conductor, and require multiple installations to cover the entire neutral conductor. In this study, a new solution of the neutral harmonic current is proposed for the three-phase four-wire distribution systems. In the proposed scheme,an active filter is connected in series with the neutral conductor. The inverter acts to suppress harmonics in the neutral conductor to prevent overloading.Results have shown that the proposed scheme can eliminate current harmonics overloading on both the neutral conductor and the distribution transformer with only one active filter installation.
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"Modeling and Control of a Three Phase Voltage Source Inverter with an LCL Filter." Master's thesis, 2015. http://hdl.handle.net/2286/R.I.29981.
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abstract: This thesis addresses the design and control of three phase inverters. Such inverters are
used to produce three-phase sinusoidal voltages and currents from a DC source. They
are critical for injecting power from renewable energy sources into the grid. This is
especially true since many of these sources of energy are DC sources (e.g. solar
photovoltaic) or need to be stored in DC batteries because they are intermittent (e.g. wind
and solar). Two classes of inverters are examined in this thesis. A control-centric design
procedure is presented for each class. The first class of inverters is simple in that they
consist of three decoupled subsystems. Such inverters are characterized by no mutual
inductance between the three phases. As such, no multivariable coupling is present and
decentralized single-input single-output (SISO) control theory suffices to generate
acceptable control designs. For this class of inverters several families of controllers are
addressed in order to examine command following as well as input disturbance and noise
attenuation specifications. The goal here is to illuminate fundamental tradeoffs. Such
tradeoffs include an improvement in the in-band command following and output
disturbance attenuation versus a deterioration in out-of-band noise attenuation.
A fundamental deficiency associated with such inverters is their large size. This can be
remedied by designing a smaller core. This naturally leads to the second class of inverters
considered in this work. These inverters are characterized by significant mutual
inductances and multivariable coupling. As such, SISO control theory is generally not
adequate and multiple-input multiple-output (MIMO) theory becomes essential for
controlling these inverters.Dissertation/Thesis
Masters Thesis Electrical Engineering 2015
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��nsal, Abdurrahman. "A DSP controlled resonant active filter for current harmonic mitigation in three-phase power systems." Thesis, 2000. http://hdl.handle.net/1957/32518.
Full textAbstract:
Power quality has become an important concern to both electric utilities and
end users due to the increased use of non-linear loads in modem power systems
over the past decade. Nonlinear loads inject harmonics into the power system and
thus may lead to poor power quality and lower power factor. Current and voltage
harmonics can adversely affect the operation of sensitive devices.
A common remedial solution to reduce the effects of harmonic distortion in
a power system is filtering. Passive and active filters are two common types of
harmonic filters. An active filter, in general, is a controllable current source that
injects current at the same magnitude and opposite phase to that of the harmonic
current. For this thesis work, a DSP-controlled active filter to cancel lower order
(5th, 7th, 11th, and 13th) harmonics in a three-phase, three-wire power system is
designed. The proposed active filter employs a series LC tank tuned to a high
frequency, along with a pulse-width modulated (PWM) converter topology. The
PWM control of the active filter is implemented in a TMS320F240 DSP. The DSP
implementation enhances the performance of the filter in real-time and enables the
filter to compensate for varying loads. Additionally, the use of DSP-control reduces
the number of components and therefore reduces the cost and improves the
reliability of the overall system. The uniqueness of the filter is in its ability to
control each harmonic separately. A laboratory prototype of the proposed active
filter has been built and tested to verify the performance of the active filter.Graduation date: 2001
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Hsu, Chih-Wei, and 許志偉. "Design and Implementation of A Three-Phase Four-Wire Multi-Function Inverter with LLCL Filter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/40974787757513704336.
Full textAbstract:
碩士國立清華大學
電機工程學系
104
This thesis presents design and implementation of a three-phase four-wire inverter with LLCL output filter. To achieve higher applicability in the emerging development of dc micro-grid and renewable energy systems, the inverter is equipped with multiple functions, including grid-connection, rectification, dc-link voltage regulation and active power filtering (APF). In general, control strategies used in most multi-function systems tend to be complex, where each operation mode requires its own way of control. However, the division-summation (D-∑) digital control adopted in this thesis is able to overcome the above problem. With one common duty-ratio expression, various operations can be realized with different current commands, which greatly reduces the control complexity. Furthermore, with system parameters such as grid voltage, dc-link voltage, filter inductance and switching period included in the duty-ratio expression, the inverter is capable of operating normally despite of parameter variation. Being the first to apply the D-∑ digital control to the inverter with an LLCL filter, this thesis also proposes several solutions on problems that could occur in hardware implementation; besides, parameter design procedure is also addressed and can be adapted to applications with different specifications. Finally, each operation mode has been tested with a prototype built in lab. Measured results show consistency with simulation, and most importantly, output current can comply with the total harmonic distortion requirement stated in “IEEE Std 519™-2014”.
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Wu, Meng Chen, and 吳孟臻. "Development of the Three-phase Four-Wire Active Power Filter with the Neutral Point Clamped Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/68094596919663698889.
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Dash, Prajna Paramita. "A High-Performance Three-Phase Grid-Connected PV System Based On Multilevel Current Source Inverter." Thesis, 2013. http://hdl.handle.net/10012/7356.
Full textAbstract:
Current Source Inverter (CSI) topology is gaining acceptance as a competitive alternative for grid interface of renewable energy systems due to its unique and advantageous features. Merits of CSI over the more popular Voltage Source Inverter (VSI) topology have been elaborated on by a number of researchers. However, there is a dearth of quality work in modeling and control of CSI topology interfacing renewable energy resources to the grid. To enrich the study focussing on application of CSI for renewable energy interface, this thesis develops a multilevel structure based on CSI for three-phase grid-connected Photovoltaic (PV) application. In the first part of research, a single-stage CSI interfacing to PV array is developed. The CSI-based PV system is equipped with Maximum Power Point Tracker (MPPT), DC-link current controller, and AC-side current controller. To eliminate the nonlinearity introduced by the PV array, a feed-forward control is introduced in the DC-link current controller. The AC-side current controller is responsible for maintaining unity power factor at the Point of Common Coupling (PCC). To verify the performance of the developed CSI-based PV system, a number of simulation studies are carried out in PSCAD/EMTDC environment. To illustrate the performance of the CSI-based PV system during transients on the grid side, simulation studies are carried out for four kinds of faults. Results obtained from fault studies are highly in favor of CSI topology and provide illustrative evidence for short-circuit current protection capability of the CSI. On the other hand, the VSI-based PV system performs poorly when subjected to similar grid transients.
To extend the research on CSI-based PV system further, a multilevel structure based on CSI is developed. The multilevel structure is a parallel combination of $n$ CSI units and capable of producing $2n+1$ levels of current at the terminal of the inverter. Each unit in the multilevel structure has its own MPPT, DC-link current controller. However, on the AC-side a combined current controller is proposed. The design results in a high power rating with reduced number of filters, sensors and controllers. The developed multilevel structure can operate with PV arrays exposed to equal and unequal insolation level. However, when the PV arrays are operating under unequal insolation level, low order harmonics are generated in the sinusoidal current that is injected into the grid. Elimination of these harmonics is performed by implementing a modified control strategy in stationary reference frame that corresponds to the harmonic component that needs to be minimized. The modified control strategy operates in coordination with the existing DC-side and AC-side current controllers, and MPPTs. Therefore, real-time suppression of current harmonics can be ensured. Performance of the multilevel structure is verified by different transient studies.
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Kuo, Chin-Chang, and 郭金璋. "FPGA-Based Implementation of Digital Controller for a Three-Phase Three-Level Active T-Type NPC Grid-Connected Inverter with LCL Filter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/xcv24t.
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碩士國立交通大學
電控工程研究所
105
The purpose of this thesis is to develop an FPGA-based controller in application to a three-phase three-level active NPC grid-connected inverter with LCL filter. The active T-type NPC (AT-NPC) combines the advantages of two-level inverter such as low conduction losses, with positive aspects of conventional NPC inverter such as low switching losses, low common-mode voltage and superior output waveform. For grid filter, LCL filter is adopted since it provides better harmonic attenuation capability with smaller inductance compared with L filter. However, LCL filter may lead to system unstable if no proper damping method is applied. In this thesis multi-loop control structure is utilized to mitigate the LCL resonance. It involves the use of outer loop and inner loop, with the outer loop ensuring steady-state reference tracking performance and the inner loop providing fast dynamic response for system disturbance and sudden reference changes. In this thesis predictive algorithm is applied for inner current loop regulation. Predictive control has the characteristic of dead-beat response therefore it can achieve fast dynamic response with minimum distortion. However, predictive control suffers from its high sensitivity to the accuracy of feedback current. Due to the reduction of inductance in LCL filter, large current ripple will occur on inverter-side. Conventional sampling strategy may not able to retrieve average current under such condition, therefore multi-sampling strategy is applied in this thesis. By multi-sampling technique the noise rejection capability is enhanced and SNR is improved. In addition, predictive control is also sensitive to parameter variations. If magnetic saturation effect occurs the inductance will decrease, which may lead to oscillation or even unstable in predictive control. In this thesis an on-line inductance estimator is developed to identify the inductance and maintain the dynamic response of the system. The designed controllers are implemented on a mixed-signal FPGA device. Experimental verifications are carried out on a 9-kW grid-connected inverter. The results show that the grid current are under well-controlled and even a sudden reference change occurs the designed controllers can still maintain system stable. The total inductance of LCL filter has a 65.38% reduction compared with that of L filter but still remain low harmonic distortion.
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Zeng, Song-Ting, and 曾崧庭. "Three-phase harmonic power flow for multi-grounded four-wires distribution systems and its passive power filter design application." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/yyh2cp.
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碩士國立臺灣科技大學
電機工程系
107
The main purpose of this thesis is to develop a three-phase harmonic power flow and its passive power filter design for multi-grounded four-wires distribution systems. Firstly, the network model of three-phase four-wire power distribution system considering the neutral line and grounding characteristics is developed. Based on the circuit decoupling concept and the injection current equivalent principle, the system components are divided into two parts: series impedance and parallel conduction. The series impedance can be used to construct the system bus impedance matrix by the graph theory, and the parallel admittance are equivalent to the bus injection currents. The direct power flow method in this thesis is derived by bus impedance matrix and bus injection currents, without bus admittance matrix inversion process of the past implicit method, and the calculation efficiency is improved. In addition, two methods to deal with the neutral grounding impedance in power flow are proposed according to the swing bus grounding impedance. To compare pros and cons in these two methods, IEEE test systems are used. At the same time, the convergence performance of the proposed method is compared with the forward-backward sweep method and Newton method based on the current injection principle. The iteration number of the proposed method is not affected by the number of grounding points and grounding impedances, and the convergence performance is better than the above mentioned two methods. The main contribution of the three-phase harmonic power flow analysis proposed in this thesis is that it can evaluate the influence of the system neutral voltage, neutral current, harmonic distortion and line loss by system grounding characteristics, load conditions, capacitor switching and harmonic components in detail. Finally, the non-dominated sorting genetic algorithm II (NSGAII) is combined to design the passive power filter to suppress the problem of triplen harmonics in the neutral line. The difference from the past method is comprehensive consideration of three-phase unbalanced harmonic system, rather than a single-phase harmonic system. Furthermore, the actual capacitor capacity is used as the capacitor selection for optimizing passive filter. Therefore, the designed filter can satisfy all harmonic limits in the three-phase system.
50
Anand, A. G. Vishal. "Single And Three Phase Power Factor Correction Techniques Using Scalar Control." Thesis, 2005. http://etd.iisc.ernet.in/handle/2005/1438.
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