Bibliografías temáticas / Power flow analysis. eng

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Literatura académica sobre el tema "Power flow analysis. eng"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 9 de febrero de 2022

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Artículos de revistas sobre el tema "Power flow analysis. eng"

Guilley, Sylvain, Florent Flament, Philippe Hoogvorst, Renaud Pacalet y Yves Mathieu. "Secured CAD Back-End Flow for Power-Analysis-Resistant Cryptoprocessors". IEEE Design & Test of Computers 24, n.º 6 (noviembre de 2007): 546–55. http://dx.doi.org/10.1109/mdt.2007.202.

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Guilley, Sylvain, Florent Flament, Philippe Hoogvorst, Renaud Pacalet y Yves Matheiu. "Secured CAD back-end flow for power-analysis resistant cryptoprocessors". IEEE Design & Test of Computers 24, n.º 99 (2007): x2. http://dx.doi.org/10.1109/mdt.2007.4343579.

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Ehrich, F. F., Z. S. Spakovszky, M. Martinez-Sanchez, S. J. Song, D. C. Wisler, A. F. Storace, H. W. Shin y B. F. Beacher. "Unsteady Flow and Whirl-Inducing Forces in Axial-Flow Compressors: Part II—Analysis". Journal of Turbomachinery 123, n.º 3 (1 de febrero de 2000): 446–52. http://dx.doi.org/10.1115/1.1370165.

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An experimental and theoretical investigation was conducted to evaluate the effects seen in axial-flow compressors when the centerline of the rotor becomes displaced from the centerline of the static structure of the engine, thus creating circumferentially nonuniform rotor-tip clearances. This displacement produces unsteady flow and creates a system of destabilizing forces, which contribute significantly to rotor whirl instability in turbomachinery. These forces were first identified by Thomas (1958. Bull. AIM, 71, No. 11/12, pp. 1039–1063.) for turbines and by Alford (1965. J. Eng. Power, Oct., pp. 333–334) for jet engines. In Part I, the results from an experimental investigation of these phenomena were presented. In this Part II, three analytic models were used to predict both the magnitude and direction of the Thomas/Alford force in its normalized form, known as the β coefficient, and the unsteady effects for the compressors tested in Part I. In addition, the effects of a whirling shaft were simulated to evaluate differences between a rotor with static offset and an actual whirling eccentric rotor. The models were also used to assess the influence of the nonaxisymmetric static pressure distribution on the rotor spool, which was not measured in the experiment. The models evaluated were (1) the two-sector parallel compressor (2SPC) model, (2) the infinite-segment-parallel-compressor (ISPC) model, and (3) the two-coupled actuator disk (2CAD) model. The results of these analyses were found to be in agreement with the experimental data in both sign and trend. Thus, the validated models provide a general means to predict the aerodynamic destabilizing forces for axial flow compressors in turbine engines. These tools have the potential to improve the design of rotordynamically stable turbomachinery.

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Guo, Ling, Yue Sun, Ling Liu, Zhixi Shen, Ruizhen Gao y Kai Zhao. "The Flow Field Analysis and Flow Calculation of Ultrasonic Flowmeter Based on the Fluent Software". Abstract and Applied Analysis 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/528602.

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We can build the three-dimensional structure model based on the Gambit software and achieve the distribution of flow field in the pipe and reflux flow condition at the position of transducer in regard to the real position of transducer according to the Fluent software. Under the framework, define the reflux length based on the distance of reflux along the channel and evaluate the effect of reflux on flow field. Then we can correct the power factor with the transmission speed difference method in the ideal condition and obtain the matching expression of power correction factor according to the practice model. In the end, analyze the simulation experience and produce the sample table based on the proposed model. The comparative analysis of test results and simulation results demonstrates the validity and feasibility of the proposed simulation method. The research in this paper will lay a foundation for further study on the optimization of ultrasonic flowmeter, enhance the measurement precision, and extend the application of engineering.

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Qu, Ouyang, Yuan y Zeng. "Steady-State Power Flow Analysis of Cold-Thermal-Electric Integrated Energy System Based on Unified Power Flow Model". Energies 12, n.º 23 (22 de noviembre de 2019): 4455. http://dx.doi.org/10.3390/en12234455.

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The integrated energy system includes various energy forms, complex operation modes and tight coupling links, which bring challenges to its steady-state modeling and steady-state power flow calculation. In order to study the steady-state characteristics of the integrated energy system, the topological structure of the cold-thermal-electric integrated energy system is given firstly. Then, the steady-state model of the power subsystem, the thermal subsystem, the cold subsystem and the distributed energy station are established, the unified power flow model is established, and the Newton Raphson algorithm is used to solve the unified power flow model. Finally, the influence of the key technical parameters on the steady-state power flow of the integrated energy system is analyzed. Research results show that the photovoltaic power generation plays a supporting role in the voltage of each bus; with the increase of electric load power, the unit value of bus voltage decreases continuously; the water supply temperature of the source node has a greater impact on the steady-state flow in the pipeline and the water supply temperature of each node; the pipeline length of the heat network has a greater impact on the end temperature of the pipeline, the water supply temperature, and the return water temperature of each node. The analysis results can support the planning, design, and optimal operation of the integrated energy system.

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Wirasanti, Paramet y Egon Ortjohann. "Active Distribution Grid Power Flow Analysis using Asymmetrical Hybrid Technique". International Journal of Electrical and Computer Engineering (IJECE) 7, n.º 4 (1 de agosto de 2017): 1738. http://dx.doi.org/10.11591/ijece.v7i4.pp1738-1748.

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A conventional distribution power flow analysis has to be improved regards the changes in distribution network. One of the changes is a grid operation because a new grid concept, e.g. micro-grid and aggregation, is aimed to be operated based on area itself. Consequently, each area can be actively operated in either grid connected mode or islanding mode. Hence, this paper proposes an asymmetrical power flow analysis using hybrid technique to support this flexible mode change. The hybrid technique offers an opportunity to analyze power flow in a decoupling way. This means that the power flow analysis can be performed separately in each grid area. Regards the distributed generation, this paper also introduces a model based on inverter-based operation, i.e. grid forming, grid supporting and grid parallel. The proposed asymmetrical hybrid load flow method is examined in three case studies, i.e. a verification study with the DIgSILENT PowerFactory, a demonstration of decoupling analysis approach and a performance study with the Newton-Raphson method.

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Hlaing, Ya Min Su y Ze Ya Aung. "Performance Analysis on Transmission Line for Improvement of Load Flow". Advanced Materials Research 433-440 (enero de 2012): 7208–12. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.7208.

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This thesis implements power flow application, Newton-Raphson method. The Newton-Raphson method is mainly employed in the solution of power flow problems. The network of Myanma electric power system is used as the reference case. The system network contains 90 buses and 106 brunches. The weak points are found in the network by using Newton-Raphson method. Bus 16, 17, 85 and 86 have the most weak bus voltages. The medium transmission line between bus 87 and bus 17 is compensated by using MATLAB program software. The transmission line is compensated with shunt reactors, series and shunt capacitors to improve transient and steady-state stability, more economical loading, and minimum voltage dip on load buses and to supply the requisite reactive power to maintain the receiving end voltage at a satisfactory level. The system performance is tested under steady-state condition. This paper investigates and improves the steady–state operation of Myanma Power System Network.

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Obushevs, Artjoms, Mario Turcik, Irina Oleinikova y Gatis Junghans. "Market Based Analysis of Power System Interconnections". Scientific Journal of Riga Technical University. Power and Electrical Engineering 28, n.º 1 (1 de enero de 2011): 25–30. http://dx.doi.org/10.2478/v10144-011-0004-z.

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Market Based Analysis of Power System InterconnectionsAnalysis in this Article is focused on usage of transmission grid under liberalized market with implicit transmission capacity allocation method, e.g. Nordic market. Attention is paid on fundamental changes in transmission utilization and its economical effective operation. For interconnection and power flow analysis and losses calculation model of Nordic grid was developed and transmission losses calculation method was created. Given approach will improve economical efficiency of system operation in electricity market conditions.

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Saraswathi, Ananthavel y S. Sutha. "Investigation of Modified Generalized Interline Power Flow Controller (GIPFC) and Performance Analysis". Applied Mechanics and Materials 622 (agosto de 2014): 111–20. http://dx.doi.org/10.4028/www.scientific.net/amm.622.111.

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Nowadays in the restructured scenario, the main challenging objective of the modern power system is to avoid blackouts and provide uninterrupted quality power supply with dynamic response during emergency to improve power system security and stability. In this sense the convertible static compensator (CSC) that is the Generalized Inter line power flow controller (GIPFC), can control and optimize power flow in multi-line transmission system instead of controlling single line like its forerunner FACTS (Flexible AC Transmission System) controller. By adding a STATCOM (Static synchronous Shunt Converter) at the front end of the test power system and connecting to the common DC link of the IPFC, it is possible to bring the power factor to higher level and harmonics to the lower level and this arrangement is popularly known as Generalized Inter line power flow controller (GIPFC). In this paper a new concept of GIPFC based on incorporating a voltage source converter with zero sequence injection SPWM technique is presented for reinforcement of system stability margin. A detailed circuit model of modified GIPFC is developed and its performance is validated for a standard test system. Simulation is done using MATLAB Simulink.Index Terms—Convertible static controller, Flexible AC Transmission System (FACTS), Generalized Interline Power Flow Controller (GIPFC),STATCOM, SSSC, Reactive power compensation.

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Imen, Labed y Labed Djamel. "Power flow variation based on extreme learning machine algorithm in power system". International Journal of Power Electronics and Drive Systems (IJPEDS) 10, n.º 3 (1 de septiembre de 2019): 1244. http://dx.doi.org/10.11591/ijpeds.v10.i3.pp1244-1254.

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<p>The main focus of this paper is a study that empowers us to understand how the temperature variation affects the transmission line resistance and as a result the power flow analysis with a specific end goal to assess losses in the electrical network. The paper is composed of two sections; the first part is a power flow study under normal conditions utilizing the neural network approach while the second investigated extreme learning machine algorithm efficiency and exactitude. Extreme learning machine algorithm has been used to settle several complications in power system: load forecasting, fault diagnosis, economic dispatch, security, transient stability; Thus, we proposed to study this technique to figure out this sort of complex issue.</p>The study was conducted for IEEE 30 bus test system. The simulation results are exposed and analyzed in detail at the end of this paper.

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Tesis sobre el tema "Power flow analysis. eng"

Balachandran, Neerajnayan. "Low power memory controller subsystem IP exploration using RTL power flow : An End-to-end power analysis and reduction Methodology". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280095.

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With FinFET based Application Specific Integrated Circuit (ASIC) designs delivering on the promises of scalability, performance, and power, the road ahead is bumpy with technical challenges in building efficient ASICs. Designers can no longer rely on the ‘auto-scaling’ power reduction that follows technology node scaling, in these times when 7nm presents itself as a ‘long-lived’ node. This leads to the need for early power analysis and reduction flows that are incorporated into the ASIC Intellectual Property (IP) design flow. This leads to a focus on power-efficient design in addition to being functionally efficient. Power inefficiency related hotspots are the leading causes of chip re-spins, and a guideline methodology to design blocks in a power-efficient manner leads to a power-efficient design of the Integrated Circuits (ICs). This alleviates the intensity of cooling requirements and the cost. The Common Memory controller is one of the leading consumers of power in the ASIC designs at Ericsson. This Thesis focusses on developing a power analysis and reduction flow for the common memory controller by connecting the verification environment of the block to low-level power analysis tools, using motivated test cases to collect power metrics, thereby leading to two main goals of the Thesis, characterization and optimization of the block for power. This work also includes an energy efficiency perspective through the Differential Energy Analysis technique, initiated by Qualcomm and Ansys, to improve the flow by improving the test cases that help uncover power inefficiencies/bugs and therefore optimize the block. The flow developed in the Thesis fulfills the goals of characterizing and optimizing the block. The characterization data is presented to provide an idea of the type of data that can be collected and useful for SoC architects and designers in planning for future designs. The characterization/profiling data collected from the blocks collectively contribute to the Electronic System-level power analysis that helps correlate the ASIC power estimate to silicon. The work also validates the flow by working on a specific sub-block, identifying possible power bugs, modifying the design and validating improved performance and thereby, validating the flow.
Med FinFET-baserade applikationsspecifika integrerade kretsar (ASIC) -konstruktioner som ger löften om skalbarhet, prestanda och kraft är vägen framåt ojämn med tekniska utmaningar när det gäller att bygga effektiva ASIC: er. Formgivare kan inte längre lita på den "autoskalande" effektminskningen som följer teknisk nodskalning, i dessa tider då 7nm presenterar sig som en "långlivad" nod. Detta leder till behovet av tidig kraftanalys och reduktionsflöden som är integrerade i ASIC Intellectual Property (IP) designflöde. Detta leder till fokus på energieffektiv design förutom att det är funktionellt effektivt. Krafteffektivitetsrelaterade hotspots är de ledande orsakerna till respins av chip, och en riktlinjemetodik för att konstruera block på ett energieffektivt sätt leder till energieffektiv design av Integrated Circuits (ICs). Detta lindrar intensiteten hos kylbehovet och kostnaden. Common Memory-kontrollen är en av de ledande energikonsumenterna i ASIC-designen hos Ericsson. Denna avhandling fokuserar på att utveckla en effektanalys och reduktionsflöde för den gemensamma minneskontrollern genom att ansluta verifieringsmiljön för blocket till lågnivåeffektanalysverktyg, med hjälp av motiverade test caser för att samla effektmätvärden, vilket leder till två huvudmål för avhandlingen, karakterisering och optimering av blocket för kraft. Detta arbete inkluderar också energieffektivitetsperspektiv genom Differential Energy Analys-teknik, initierad av Qualcomm och Ansys, för att förbättra flödet genom att förbättra test cases som hjälper till att upptäcka effekteffektivitet / buggar och därför optimera blocket. Flödet som utvecklats i avhandlingen uppfyller målen att karakterisera och optimera blocket. Karaktäriseringsdata presenteras för att ge en uppfattning om vilken typ av data som kan samlas in och vara användbara för SoC-arkitekter och designers i planering för framtida mönster. Karaktäriserings/ profileringsdata som samlats in från blocken bidrar tillsammans till effektanalysen för elektronisk systemnivå som hjälper till att korrelera ASIC-effektberäkningen till kisel. Arbetet validerar också flödet genom att arbeta på ett specifikt underblock, identifiera möjliga effektbuggar, modifiera utforma och validera förbättrad prestanda och därmed validera flödet.

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Canossa, Jâine Henrique. "Um programa interativo para estudos de fluxo de potência /". Ilha Solteira : [s.n.], 2007. http://hdl.handle.net/11449/87243.

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Orientador: Dilson Amâncio Alves
Banca: Sergio Azevedo de Oliveira
Banca: Carlos Alberto Castro Júnior
Resumo: Este trabalho apresenta um programa interativo para a simulação do fluxo de potência e do fluxo de potência continuado. O programa foi desenvolvido no ambiente MATLAB e a simulação é realizada por meio de uma interface gráfica. A interface gráfica não só proporciona um bom desempenho computacional, mas também torna o programa mais amigável para o usuário. Através dela o usuário pode editar os arquivos de entrada e saída e visualizar e analisar os resultados obtidos diretamente na tela do computador. A partir do diagrama unifilar dos sistemas, a interface gráfica permite que o usuário: mude os parâmetros do sistema (dados de barras e de linhas de transmissão); remova uma linha de transmissão com um simples clicar sobre ela; visualize os perfis de tensão nas barras, e os fluxos de potência ativa e reativa nas linhas de transmissão. Todas estas características fazem do programa desenvolvido uma ferramenta recomendada para fins educacionais.
Abstract: This work presents an interactive computing program for power flow and continuation power flow simulations. The power flow and continuation power flow programs were developed in the MATLAB environment and the simulation is accomplished through a graphical user interface. The graphical user interface provides not only a good computational performance, but also an user-friendly teaching software. With the use of this interface the user can edit the input and output data files of the selected systems and can visualize and analyze the results of the program directly in the computer screen. Directly from the system one-line diagrams, the graphical user interface allows the user: to change the parameters of the system (bus and lines system data); to remove the transmission line clicking directly on it; to visualize the bus voltage profile, and the active and reactive power flows. All these characteristics make the developed program recommended for educational purposes.
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Zhang, Xiang. "Dimensional analysis based CFD modelling for power transformers". Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/dimensional-analysis-based-cfd-modelling-for-power-transformers(49cac27d-38b9-4f23-a6ec-b5106422420c).html.

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Reliable thermal modelling approaches are crucial to transformer thermal design and operation. The highest temperature in the winding, usually referred to as the hot-spot temperature, is of the greatest interest because the insulation paper at the hot-spot undergoes the severest thermal ageing, and determines the life expectancy of the transformer insulation. Therefore, the primary objective of transformer thermal design is to control the hot-spot temperature rise over the ambient temperature within certain limit. For liquid-immersed power transformers, the hot-spot temperature rise over the ambient temperature is controlled by the winding geometry, power loss distribution, liquid flow rate and liquid properties. In order to obtain universally applicable thermal modelling results, dimensional analysis is adopted in this PhD thesis to guide computational fluid dynamics (CFD) simulations for disc-type transformer windings in steady state and their experimental verification. The modelling work is split into two parts on oil forced and directed (OD) cooling modes and oil natural (ON) cooling modes. COMSOL software is used for the CFD simulation work For OD cooling modes, volumetric oil flow proportion in each horizontal cooling duct (Pfi) and pressure drop coefficient over the winding (Cpd) are found mainly controlled by the Reynolds number at the winding pass inlet (Re) and the ratio of horizontal duct height to vertical duct width. The correlations for Pfi and Cpd with the dimensionless controlling parameters are derived from CFD parametric sweeps and verified by experimental tests. The effects of different liquid types on the flow distribution and pressure drop are investigated using the correlations derived. Reverse flows at the bottom part of winding passes are shown by both CFD simulations and experimental measurements. The hot-spot factor, H, is interpreted as a dimensionless temperature at the hot-spot and the effects of operational conditions e.g. ambient temperature and loading level on H are analysed. For ON cooling modes, the flow is driven by buoyancy forces and hot-streak dynamics play a vital role in determining fluid flow and temperature distributions. The dimensionless liquid flow and temperature distributions and H are all found to be controlled by Re, Pr and Gr/Re2. An optimal design and operational regime in terms of obtaining the minimum H, is identified from CFD parametric sweeps, where the effects of buoyancy forces are balanced by the effects of inertial forces. Reverse flows are found at the top part of winding passes, opposite to the OD results. The total liquid flow rates of different liquids for the same winding geometry with the same power loss distribution in an ON cooling mode are determined and with these determined total liquid flow rates, the effects of different liquids on fluid flow and temperature distributions are investigated by CFD simulations. The CFD modelling work on disc-type transformer windings in steady state present in this PhD thesis is based on the dimensional analyses on the fluid flow and heat transfer in the windings. Therefore, the results obtained are universally applicable and of the simplest form as well. In addition, the dimensional analyses have provided insight into how the flow and temperature distribution patterns are controlled by the dimensionless controlling parameters, regardless of the transformer operational conditions and the coolant liquid types used.

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Marin, Manuel. "GPU-enhanced power flow analysis". Thesis, Perpignan, 2015. http://www.theses.fr/2015PERP0041.

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Cette thèse propose un large éventail d'approches afin d'améliorer différents aspects de l'analyse des flux de puissance avec comme fils conducteur l'utilisation du processeurs graphiques (GPU). Si les GPU ont rapidement prouvés leurs efficacités sur des applications régulières pour lesquelles le parallélisme de données était facilement exploitable, il en est tout autrement pour les applications dites irrégulières. Ceci est précisément le cas de la plupart des algorithmes d'analyse de flux de puissance. Pour ce travail, nous nous inscrivons dans cette problématique d'optimisation de l'analyse de flux de puissance à l'aide de coprocesseur de type GPU. L'intérêt est double. Il étend le domaine d'application des GPU à une nouvelle classe de problème et/ou d'algorithme en proposant des solutions originales. Il permet aussi à l'analyse des flux de puissance de rester pertinent dans un contexte de changements continus dans les systèmes énergétiques, et ainsi d'en faciliter leur évolution. Nos principales contributions liées à la programmation sur GPU sont: (i) l'analyse des différentes méthodes de parcours d'arbre pour apporter une réponse au problème de la régularité par rapport à l'équilibrage de charge ; (ii) l'analyse de l'impact du format de représentation sur la performance des implémentations d'arithmétique floue. Nos contributions à l'analyse des flux de puissance sont les suivantes: (ii) une nouvelle méthode pour l'évaluation de l'incertitude dans l'analyse des flux de puissance ; (ii) une nouvelle méthode de point fixe pour l'analyse des flux de puissance, problème que l'on qualifie d'intrinsèquement parallèle
This thesis addresses the utilization of Graphics Processing Units (GPUs) for improving the Power Flow (PF) analysis of modern power systems. Currently, GPUs are challenged by applications exhibiting an irregular computational pattern, as is the case of most known methods for PF analysis. At the same time, the PF analysis needs to be improved in order to cope with new requirements of efficiency and accuracy coming from the Smart Grid concept. The relevance of GPU-enhanced PF analysis is twofold. On one hand, it expands the application domain of GPU to a new class of problems. On the other hand, it consistently increases the computational capacity available for power system operation and design. The present work attempts to achieve that in two complementary ways: (i) by developing novel GPU programming strategies for available PF algorithms, and (ii) by proposing novel PF analysis methods that can exploit the numerous features present in GPU architectures. Specific contributions on GPU computing include: (i) a comparison of two programming paradigms, namely regularity and load-balancing, for implementing the so-called treefix operations; (ii) a study of the impact of the representation format over performance and accuracy, for fuzzy interval algebraic operations; and (iii) the utilization of architecture-specific design, as a novel strategy to improve performance scalability of applications. Contributions on PF analysis include: (i) the design and evaluation of a novel method for the uncertainty assessment, based on the fuzzy interval approach; and (ii) the development of an intrinsically parallel method for PF analysis, which is not affected by the Amdahl's law

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Bayan, Nima. "Harmonic flow analysis in power distribution networks". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0011/MQ52509.pdf.

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Dandachi, Najib H. "Network flow method for power system analysis". Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47398.

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Yang, J. "Power flow analysis of nonlinear dynamical systems". Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/355696/.

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The power ow analysis approach, which arose from high frequency vibration problems, has been developed into a powerful technique to characterise the dynamic behaviour of complex structures and coupled systems. It has been extensively used to study various linear systems. However, because of the complexity in modelling and simulation, the power ow behaviour of nonlinear dynamical systems remains largely unexplored. This thesis aims to develop power ow analysis approaches for nonlinear dynamical systems, to investigate the effects of damping and/or stiffness nonlinearities on their power ow behaviour, and to apply the findings to enhance the performance of energy harvesting devices as well as vibration control systems. Power ow characteristics of the Du�ng and the Van der Pol (VDP) oscillators are investigated to address the distinct power input and dissipation behaviour due to stiffness and damping nonlinearities, respectively. It is shown that in a nonlinear velocity response with multiple frequency signatures, only the in-phase component of the same frequency as the harmonic excitation contributes to the time-averaged input power. It is demonstrated that bifurcations can cause significant jumps of time-averaged power ows, whereas the associated time-averaged input power of a chaotic response is insensitive to the initial conditions but tends to an asymptotic value as the averaging time increases. It is also found that the time averaged input power of the unforced VDP oscillator can become negative in some ranges of excitation frequencies. Power ow behaviour of two degrees-of-freedom systems with nonlinear stiffness/- damping is also studied using the developed methods to enhance vibration isolation/absorption performance. It is demonstrated that the stiffness and damping nonlinearities in the system affects time-averaged power ows mainly in a narrow frequency range around resonance frequencies. The work described in this thesis provides new insights into power ow generation, transmission and dissipation mechanisms in nonlinear dynamical systems and facilitates more reliable and effective designs with improved dynamic performance. The ability of the VDP oscillator to extract external energy sheds light on energy harvesting using ow-induced vibrations of a nonlinear apping foil system. A nonlinear isolator with a negative sti�ness mechanism is proposed providing less input power in an enlarged frequency range. These studies thus yield an improved understanding of power ow behaviour in nonlinear dynamical systems.

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Wang, Zhenhong. "Power flow analysis of engineering structure using substructure techniques". Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270373.

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Olofsson, Magnus. "Power Flow Analysis of the Swedish Railway Electrical System". Licentiate thesis, Stockholm, 1993. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-223934.

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This thesis deals with analysis of the steady state power flow in the Swedish railway electrical system. Finding the steady state of the system means that all voltages and power flows in the system are known. The trains are supplied from the public grid using frequency converters. This is the major difference compared with ordinary power systems fed from turbine-driven generators. The output voltage phase shift function for the converters is important in the mathematical formulation of the problem. In the system, the locomotives are almost entirely of the Re-type, having a rectifier and d.c.-motors. The fundamental frequency reactive power need is thereby dependent on the train speed, wheel power and line voltage. In this thesis, the converters and thyristor locomotives are modelled and included in the load flow formulation. The method is shown to have good convergence properties. An approximate and fast method for the calculation of the power injections from converters is presented. A necessary condition for this approximate method to be valid is that the converters are strongly interconnected. The construction of a new 130 kV line brings the converters close to each other electrically. Energy input from each of the converters inthe system can be simulated calculating repeated load flows. Measurements in a real system have verified the applicability of the proposed load flow method. Examples of areas where the method can be used are system studies and optimal control of the system. The locomotives act as sources of harmonic currents. In an extended load flow formulation this is taken into account. The fundamental idea behind the method is that harmonic powers caused by the thyristor bridges at first are transferred as fundamental frequency active power from the sinusoidal voltage sources. The method thus gives the fundamental frequency powers injected from the sinusoidal voltage sources to the network. Comparisons with time simulations with detailed models show good agreement.

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Estes, Steven Douglas. "Power system analysis suite for Windows". Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-02132009-170931/.

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Libros sobre el tema "Power flow analysis. eng"

Power system analysis: Short-circuit load flow and harmonics. 2^a ed. Boca Raton: CRC Press, 2012.

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Power system analysis: Short-circuit load flow and harmonics. New York: Marcel Dekker, 2002.

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G, Wilson David y SpringerLink (Online service), eds. Nonlinear Power Flow Control Design: Utilizing Exergy, Entropy, Static and Dynamic Stability, and Lyapunov Analysis. London: Springer-Verlag London Limited, 2011.

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Heitz, L. F. Prediction of flow duration curves for use in hydropower analysis at ungaged sites in Pohnpei, FSM. Mangilao, Guam]: Water and Environmental Research Institute of the Western Pacific, University of Guam, 2010.

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Borkowski, Dariusz. Matrix converter as power flow controller in transmission line--operation analysis in frequency domain: Przekształtnik macierzowy jako kontroler przepływu mocy w linii elektroenergetycznej--analiza pracy układu w dziedzinie częstotliwości = [Matrichnyĭ preobrazovatelʹ kak reguli︠a︡tor peretoka moshchnosti v linii ėlektroperedachi--analiz po operat︠s︡iĭ v oblasti chastot]. Kraków: Politechnika Krakowska im. Tadeusza Kościuszki, 2013.

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United States. National Aeronautics and Space Administration., ed. Numerical prediction of turbulent oscillating flow and heat transfer in pipes with various end geometries. [Washington, D.C: National Aeronautics and Space Administration, 1995.

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Power System Load Flow Analysis (Professional Engineering). McGraw-Hill Professional, 2004.

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Powell, Lynn. Power System Load Flow Analysis (Professional Engineering). McGraw-Hill Professional, 2004.

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1952-, Bernhard Robert y United States. National Aeronautics and Space Administration., eds. Vibrational power flow analysis of rods and beams. [West Lafayette, Ind: Purdue University, 1988.

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Morin, Philip S. G. Power flow and fault analysis by computer methods. Bradford, 1985.

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Capítulos de libros sobre el tema "Power flow analysis. eng"

Milano, Federico. "Power Flow Analysis". En Power System Modelling and Scripting, 61–101. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13669-6_4.

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Tuinema, Bart W., José L. Rueda Torres, Alexandru I. Stefanov, Francisco M. Gonzalez-Longatt y Mart A. M. M. van der Meijden. "Probabilistic Power Flow Analysis". En Probabilistic Reliability Analysis of Power Systems, 179–208. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43498-4_6.

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Milano, Federico. "Continuation Power Flow Analysis". En Power System Modelling and Scripting, 103–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13669-6_5.

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Milano, Federico. "Optimal Power Flow Analysis". En Power System Modelling and Scripting, 131–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13669-6_6.

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Arrillaga, J. y C. P. Arnold. "Load Flow". En Computer Analysis of Power Systems, 7–41. West Sussex, England: John Wiley & Sons, Ltd., 2013. http://dx.doi.org/10.1002/9781118878309.ch2.

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Debs, Atif S. "Load Flow Analysis". En Modern Power Systems Control and Operation, 19–86. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-1073-0_3.

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Salam, Md Abdus. "Load Flow Analysis". En Fundamentals of Electrical Power Systems Analysis, 317–77. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3212-2_7.

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Soman, S. A., S. A. Khaparde y Shubha Pandit. "Optimal Power Flow". En Computational Methods for Large Sparse Power Systems Analysis, 257–92. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-0823-6_11.

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Soman, S. A., S. A. Khaparde y Shubha Pandit. "Load Flow Analysis". En Computational Methods for Large Sparse Power Systems Analysis, 147–78. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-0823-6_8.

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Čepin, Marko. "Methods for Power Flow Analysis". En Assessment of Power System Reliability, 141–68. London: Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-688-7_11.

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Actas de conferencias sobre el tema "Power flow analysis. eng"

Mönig, Reinhard, Frank Mildner y Ralf Röper. "Viscous-Flow 2D-Analysis Including Secondary Flow Effects". En ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0628.

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During the last few decades extremely powerful Quasi-3D codes and fully 3D Navier-Stokes solvers have been developed and successfully utilized in the design process and optimization of multistage axial-flow compressors. However, most of these methods proved to be difficult in handling and extremely time consuming. Due to these disadvantages, the primary stage design and stage matching as well as the off-design analysis is nowadays still based on fast 2D methods incorporating loss-, deviation- and end wall modeling. Only the detailed 3D optimization is normally performed by means of advanced 3D methods. In this paper a fast and efficient 2D calculation method is presented, which already in the initial design phase of multistage axial flow compressors considers the influence of hub leakage flows, tip clearance effects and other end wall flow phenomena. The method is generally based on the fundamental approach by Howard and Gallimore (1992). In order to allow a more accurate prediction of skewed and non-developed boundary layers in turbomachines an improved theoretical approach was implemented. Particularly the splitting of the boundary layers into an axial and tangential component proved to be necessary in order to account for the change between rotating and stationary end walls. Additionally, a new approach is used for the prediction of the viscous end wall zones including hub leakage effects and strongly skewed boundary layers. As a result, empirical correlations for secondary flow effects are no longer required. The results of the improved method are compared with conventional 2D-results including 3D loss- and deviation-models, with, experimental data of a 3-stage research compressor of the Institute for Jet Propulsion and Turbomachinery of the Technical University of Aachen and with 3D Navier-Stokes solutions of the V84.3A compressor and of a multi-stage Siemens research compressor. The results obtained using the new method show a remarkable improvement in comparison with conventional 2D-methods. Due to the high quality and the extremely short computation time the new method allows an overall viscous design of multistage compressors for heavy duty gas turbines and aeroengine applications.

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Torresi, Marco, Alessandro Saponaro, Sergio Mario Camporeale y Bernardo Fortunato. "CFD Analysis of the Flow Through Tube Banks of HRSG". En ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-51300.

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The prediction of the performance of HRSG (Heat Recovery Steam Generator) by means of CFD codes is of great interest, since HRSGs are crucial elements in gas turbine combined cycle power plants, and in CHP (combined heat and power) cycles. The determination of the thermo-fluid dynamic pattern in HRSGs is fundamental in order to improve the energy usage and limit the ineffectiveness due to non-homogeneous flow patterns. In order to reduce the complexity of the simulation of the fluid flow within the HRSG, it is useful modeling heat exchangers as porous media zones with properties estimated using pressure drop correlations for tube banks. Usually, air-side thermo-fluid dynamic characteristics of finned tube heat exchangers are determined from experimental data. The aim of this work is to develop a new procedure, capable to define the main porous-medium non-dimensional parameters (e.g., viscous and inertial loss coefficients; porosity; volumetric heat generation rate; etc...) starting from data obtained by means of accurate three-dimensional simulations of the flow through tube banks. Both finned and bare tube banks will be considered and results presented. The analysis is based on a commercial CFD code, Fluent v.6.2.16. In order to validate the proposed procedure, the simulation of an entire fired HRSG of the horizontal type developed by Ansaldo Caldaie for the ERG plant at Priolo (Italy) has been performed and results have been compared with their data.

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Xiao, Yumin y R. S. Amano. "Analysis of Flow and Heat Transfer in the End-Wall Region of a Turbine Blade Passage". En ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0211.

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A numerical study has been performed to predict a three-dimensional turbulent flow and end-wall heat transfer in a blade passage. The complex three-dimensional flow in the end-wall region has an important impact on the local heat transfer. The leading edge horseshoe vortex, the leading edge corner vortices, the passage vortex, and the trailing edge wake cause large variations in the entire end-wall region. The heat transfer distributions in the end-wall region are calculated and the mechanism for the high heat transfer region has been revealed. The calculations show that the algebraic turbulence model lacks the ability to predict the heat transfer in the transition region, but it is valid in other flow region. The local high heat transfer downstream of the trailing edge is enhanced by the wake downstream of the trailing edge. The horseshoe vortex results a high heat transfer region near the leading edge and induces the leading edge corner vortices which cause high heat transfer on the end-wall at both sides of blade end-wall corner.

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Prabhudharwadkar, Deoras, Zain Dweik, A. Subramani y Murali Krishnan R. "Investigation of the Prediction Correlations for the Flow Through Rotating Orifices in the Gas Turbine Secondary Air Flow System". En ASME 2013 Power Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/power2013-98128.

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The secondary air flow system of a gas turbine cools and seals those parts of the turbine which would otherwise be exposed to the high temperatures, resulting in their life reduction or even failures. At the same time, excessive secondary air flow hinders the performance of the engine. Accurate analysis of the secondary system is therefore necessary to safeguard the reliable design of the engine and accurate life predictions. The secondary system is analyzed through the flow network analysis which comprises of chambers or cavities connected through flow passages or restrictions. There are significant number of locations where the air passes through stationary or rotating holes, e.g., the pre-swirl nozzles and the turbine blade receiver holes respectively. The accuracy of the flow prediction depends on the accuracy of the orifice discharge coefficient. This paper provides a detailed assessment of the available discharge coefficient correlations. The discharge coefficient has been found to be dependent on the geometric parameters (viz., length, inlet radius, chamfer), and the amount of cross-flow at the orifice entrance. The cross-flow may result from the relative tangential velocity between the orifice and the air or the inclination of the inlet flow with respect to the orifice axis. In this study, it was found that the discharge coefficient correlations provide similar predictions for flows without any cross-flow. However, significant deviations are seen in the predictions for the cases involving cross-flow. To identify the most accurate correlation for secondary flow application, a thorough assessment was performed using the static and the rotating test data available in the literature. In addition to the comparison using available experimental data, a CFD study was performed to independently assess the correlations. This exercise led to the identification of the most suitable correlation for our application.

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Cattanei, Andrea, Pietro Zunino, Thomas Schro¨der, Bernd Stoffel y Berthold Matyschok. "Detailed Analysis of Experimental Investigations on Boundary Layer Transition in Wake Disturbed Flow". En ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90128.

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In the framework of a co-operation between the University of Genoa and the Darmstadt University of Technology measurement data of a former investigation at Darmstadt, comprising measurements with surface-mounted hot-film sensors on the boundary layer transition in wake disturbed flow, were transferred to Genoa, then re-evaluated and in great detail analyzed, much further than the original data evaluation. In these experimental investigations at Darmstadt, the boundary layer transition with and without transitional separation bubbles was studied on a circular cylinder in cross flow. The comparison of hot-wire traverses with the surface-mounted hot-film distributions clearly indicated that the surface-mounted hot-film technique is a very suitable measurement technique to obtain reliable information on transition and separation phenomena with both high spatial and temporal resolution. The new data evaluation techniques applied to these data at Genoa further enhanced the insight into the details of the boundary layer transition and separation process. The surface-mounted hot-film data were evaluated by means of time-space diagrams for the first three statistical moments (mean, RMS and skewness), with which the origin and the extent of unsteady separation bubbles clearly could be seen. The results obtained from these data analyses on the one hand yield a considerable enhancement of the understanding of the periodically unsteady boundary layer transition process and on the other hand they form the basis for the application of surface-mounted hot-film sensors in more complex flow situations like e.g. in cold flow multistage turbine or compressor test rigs or even in the hostile environment of real aero engine compressors or turbines.

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Tınaztepe, H. Tug˘rul, Ahmet S¸ U¨c¸er y I˙ Sinan Akamandor. "Performance Evaluation of an Internal Flow Navier-Stokes Solver for Compressible Viscous Flow Simulations". En ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30681.

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A three-dimensional compressible full Navier-Stokes solver is developed for the analysis of the flow field inside turbomachinary cascades. The solver uses an explicit second order accurate (cell-vertex) finite volume Lax-Wendroff scheme over hexahedral cells. The viscous and heat conduction terms are discretized in conservative form at the cell center. Second and fourth order numerical smoothing terms are added with local scaling factors. Eddy viscosity is calculated by the Baldwin-Lomax model and is adapted to the pointered cell based algorithm. Turbulent viscosity is blended by inverse distance square weighting functions near corners. Characteristic boundary conditions are used. A computational analysis has been carried out to present the capability of the solver in capturing secondary velocity patterns, flow angles and total pressure loss distributions inside a linear high turning turbine cascade. A controlled diffusion compressor cascade at high incidence has been analyzed. Main features of the flow field in this compressor cascade were resolved (secondary and end wall flows and leading edge laminar separation bubble) as in the experimental data. The main aim of the work is to demonstrate the performance of the code in capturing the details of the complicated flow fields using grids that can be regarded as coarse.

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Genrup, Magnus, Mohsen Assadi y Tord Torisson. "A Review of Gas Turbine Flow Path Analysis: From Paper Calculation to Artificial Neural Networks". En ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30027.

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Today many methods are available for gas turbine flow path analysis. Some of them are very simple but yet very useful, since they give an indication of the compressor capacity with almost no calculation effort. The state of the art today is the heat and mass balance models (HMB), which are more sophisticated. This paper presents a general overview of these methods, including the most recent trend, Artificial Neural Networks (ANN). In the future, the ANN-based flow path analysis system will probably, to some extent, replace the HMB-based systems, or become a complementary tool for monitoring and performance analysis of power production units. This paper will give a comprehensive explanation of how to build a flow path analysis system in an equation-solving package (e.g. spreadsheet program), by using relationships presented here. This may give a system that is well within the capabilities of most commercially available systems, used and developed by consultant companies (third party companies).

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Wankhede, Moresh J., Neil W. Bressloff, Andy J. Keane, Luca Caracciolo y Marco Zedda. "An Analysis of Unstable Flow Dynamics and Flashback Mechanism Inside a Swirl-Stabilised Lean Burn Combustor". En ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22253.

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A modern lean burn combustor for propulsion application using a multi-swirler fuel injector system is studied under partially premixed combustion conditions. Combustion induced vortex breakdown (CIVB) plays an important role in establishing the near-field aerodynamic characteristics of lean burn fuel injectors, influencing fuel/air mixing and flame stability. The precise nature of the vortex breakdown can take on several forms mainly consisting of a precessing vortex core (PVC) and the appearance of multiple helical vortices formed in the swirl stream shear layer. In the present study a numerical investigation is carried out with an unsteady Reynolds-averaged Navier Stokes (URANS) solver to capture the evolution of the PVC in the vicinity of the air blast atomizer of the injector and the helical vortex patterns inside the combustor. PVC suppression is captured causing upstream flame propagation and a sudden rise in the temperature near the injector end. The existence of hot-spots is reported near the injector end which can increase NOx production and also cause possible damage to the injector assembly itself. The unsteady dynamics of the PVC, which significantly influences fuel efficiency and emissions, are analyzed for a relatively long period of real time. The variation of velocity along the axis of the combustor confirming upstream flame propagation in to the injector is plotted. Mass weighted average temperatures across different planes in the combustor are monitored as target functions. The influence of different time-step sizes on the prediction of the temperature across these different planes is also presented. For this lean burn combustor using a complex multi-swirler fuel injector system, the results demonstrate the formation of a startup PVC in the vicinity of the air blast atomizer of the injector, its unstable mode of excitation, sustainment and suppression due to CIVB over a period of time and its strong influence on injector near-field aero-thermodynamics.

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Sahoo, Vineet, Debanshu Roy y Rathindranath Maiti. "Analysis of Leakage Flow Through the Flank Contacts in Transition Zone in Involute External Toothed Gear Pump". En ASME/BATH 2017 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fpmc2017-4287.

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The leakage past the tooth flanks of the gears in transition contacts in involute external toothed gear pump is analyzed in details using CFD in Fluent®. Analytical results support the experimentally visualized flow patterns [1]. Extending the approach of an earlier investigation [2] more rigorous analyses are carried out considering actual gear data of a pump and a full cycle of contact. However, the relieve groove and cavitation are not considered. The basic purpose is to establish the flow pattern analyses using CFD in Fluent-Ansys® environment. The beginning and the end of entrapment, squeezing of fluid, pressure build up, separation and generation of gap at the active contact and instantaneous flow through the gap are estimated meticulously.

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Pfau, A., A. I. Kalfas y R. S. Abhari. "Making Use of Labyrinth Interaction Flow". En ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53797.

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It is the aim of this publication to attract the designers attention to the end wall flow interactions of shrouded high pressure turbines. One of the key issue for designing better turbines is the understanding of the flow interactions set up by the presence of labyrinth seals. Those interaction flows are carefully examined in this publication using the control volume analysis and the radial equilibrium of forces acting on streamlines. The consequences on secondary flow development and mixing losses are discussed and quantified. Out of this insight, design recommendations are derived, which attempt to make use of the nature of the labyrinth interaction flow. The open labyrinth cavities are classified in a systematic way. The aim of this approach is to work out the characteristic differences between hub and tip cavities and those having a leakage jet or sucking main flow fluid into the labyrinth. The influence on the main flow is discussed in terms of the incidence flow angle of downstream blade rows and the associated loss production mechanisms. The design strategies presented in this paper follow two paths: (a) Optimization of the mixing losses of the leakage jets at hub and tip is estimated to result in an efficiency increase of up to 0.2%. (b) The non-axisymmetric shaping of the labyrinth interaction flow path aims at the secondary flow control in downstream blade rows. This approach might contribute in the same magnitude of order as reduction in the mixing losses.

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Informes sobre el tema "Power flow analysis. eng"

Sorooshian, Kianfar. Load flow and contingency analysis in power systems. Portland State University Library, enero de 2000. http://dx.doi.org/10.15760/etd.3310.

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Cuschieri, J. M. Mobility Power Flow Analysis of a Thick Plate Structure. Fort Belvoir, VA: Defense Technical Information Center, enero de 1990. http://dx.doi.org/10.21236/ada279431.

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Broderick, Robert Joseph, Jimmy Edward Quiroz, Abraham Ellis, Matthew J. Reno, Jeff Smith y Roger Dugan. Time series power flow analysis for distribution connected PV generation. Office of Scientific and Technical Information (OSTI), enero de 2013. http://dx.doi.org/10.2172/1088099.

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McCraney, Joshua. Analysis of Capillary Flow in Interior Corners : Perturbed Power Law Similarity Solutions. Portland State University Library, enero de 2000. http://dx.doi.org/10.15760/etd.2721.

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