Tesis sobre el tema "Power-flow solution"
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Laury, John. "Optimal Power Flow for an HVDC Feeder Solution for AC Railways". Thesis, KTH, Elektrisk energiomvandling, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104655.
Texto completoKleinberg, Michael R. Miu Karen Nan. "Distributed multi-phase distribution power flow : modeling, solution algorithm, and simulation results /". Philadelphia, Pa. : Drexel University, 2007. http://hdl.handle.net/1860/1307.
Texto completoHuneault, Maurice. "An investigation of the solution to the optimal power flow problem incorporating continuation methods /". Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75853.
Texto completoThis thesis first presents an analysis of the various structures used in optimal power flow algorithms. Then, having chosen and presented the structure of our algorithm, we analyze the quadratic subproblems generated by this algorithm for some of its more important tasks: minimum cost, minimum losses and load shedding. New rules are proposed to link the solutions of successive subproblems to ensure the convergence of the nonlinear problem. Then, as a final contribution to the theory, some extensions are suggested for the subproblems: among them are ramp constraints, bus incremental costs, and provisions for redispatching.
Numerical simulations of the proposed optimal power flow algorithm using the minimum fuel cost task were performed on four test systems, with sizes ranging from 6 to 118 buses. The results are documented in detail, and results for the 30 bus test are compared to those reported by other authors. All in all, our results demonstrate quite well the potential of this technique. (Abstract shortened with permission of author.)
Isazadeh, Mohammad Ali. "Numerical solution of reacting laminar flow heat and mass transfer in ducts of arbitrary cross-sections for power-law fluids". Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41628.
Texto completoIn the mathematical modelling of the system under consideration, variable physical and transport properties of fluid, viscous heat-dissipation and buoyancy effects are also considered. The non-Newtonian power-law constitutive equation is employed to express the rheology of the purely viscous fluid considered.
Applying a novel feature of the solution procedure, the contravariant velocity components are introduced into the transformed equations while the physical Cartesian velocity components are retained as dependent variables of the velocity field in the equations. This approach greatly simplifies the subsequent finite-difference formulation of the transformed equations. The latter equations are discretized by the control-volume finite-difference method in which a suitably-adopted staggered grid is employed using Patankar's B-type arrangement in the transformed plane. For discretization, the transformed equations are integrated over 3D control-volumes, followed by differencing the convective and diffusive terms employing upwind and central-difference schemes respectively. A modified version of the SIMPLER algorithm is introduced in the solution procedure and a line-by-line TDMA algorithm is employed for the solution of the discretization equations.
A computer-programme is developed for the generation of non-orthogonal grids corresponding to the B-type arrangement in the transformed plane. A general computer programme in Fortran is developed in this study for the solution of flow, heat and mass transfer problems for laminar reacting fluids in straight ducts of arbitrary cross-sections for Newtonian and purely viscous non-Newtonian fluids. The model and computer codes are validated by theoretical, experimental and numerical results from various sources.
The computer programmes are employed for studies in the analysis of hydrodynamics and heat transfer in the thermal entrance regions of ducts of arbitrary cross-sections for Newtonian and non-Newtonian fluids. Relevant results are documented for triangular, trapezoidal and pentagonal ducts. The computer programmes are ultimately employed for simulation of the production of polystyrene in arbitrary cross-sectional duct reactors.
HIPOLITO, FABIO C. "Avaliação das metodologias de análise de sistemas de tubulações de vapor sujeitas a carregamentos do tipo Steam Hammer". reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26938.
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Carregamentos transientes termo hidráulicos do tipo Steam Hammer são eventos comuns em sistemas de tubulações de vapor com grandes potenciais de catástrofes em plantas de geração de energia. Uma vez iniciado o evento, ondas de pressões são geradas com amplitudes, geralmente, de grande magnitude ocasionando altas pressões no sistema, ruídos, deformações, fadiga, com possibilidade de danos materiais e econômicos e em casos extremos fatalidades. Os procedimentos da indústria para análise deste tipo de sistema consistem realização de análises estáticas equivalentes ou análise de espectro de resposta com carregamentos caracterizados por meio de métodos analíticos baseados em hipóteses simplificadoras do fluido e fluxo. Neste trabalho é proposta a analise de sistema de tubulações por meio do método de integração numérica com superposição modal e carregamento caracterizado por método numérico com base no método das características. Comparações foram efetuadas entre os resultados obtidos pela metodologia proposta e os procedimentos da indústria, demonstrando que, dado ao alto grau de conservadorismo, os procedimentos da indústria acarretam em superdimensionamento de estruturas e tubulações ocasionando custos adicionais de projeto, sendo a otimização do projeto obtida aplicando-se a metodologia proposta no trabalho.
Dissertação (Mestrado em Tecnologia Nuclear)
IPEN/D
Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
Xu, Wenyuan. "A multiphase harmonic load flow solution technique". Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/31035.
Texto completoApplied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
Salgado, Roberto de Souza. "Optimal power flow solutions using the gradient projection method". reponame:Repositório Institucional da UFSC, 1989. http://repositorio.ufsc.br/xmlui/handle/123456789/75577.
Texto completoAbur, Ali. "Knowledge-based power flow models and array processor-based power flow solutions for fast prediction of system states /". The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487261553057511.
Texto completoGarcía-Blanco, Raquel. "Efficient solvers for power flow equations : parametric solutions with accuracy control assessment". Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/458887.
Texto completoEl modelo de flujo de potencias se usa para predecir el comportamiento de redes eléctricas y desemboca en la resolución de un sistema de ecuaciones algebraicas no lineales. Modelar una red es esencial para optimizar su diseño y control. Ambas aplicaciones requieren una respuesta rápida a las múltiples peticiones de una familia paramétrica de problemas de flujo de potencias. Diversos métodos de resolución se diseñaron especialmente para resolver la versión algebraica de las ecuaciones de flujo de potencias. Sin embargo, no existe ninguna metodología que proporcione una solución explícita al problema paramétrico de flujo de potencias (esto quiere decir, un vademecum computacional explícito en términos de los parámetros). Esta tesis tiene como objetivo diseñar algoritmos que produzcan vademecums para el problema paramétrico de flujo de potencias. Una vez que las soluciones están disponibles, resolver problemas para diferentes valores de los parámetros es un posproceso extremadamente rápido (en tiempo real) y por lo tanto los problemas de diseño óptimo y control se pueden resolver inmediatamente. En la primera fase, una nueva familia de métodos de resolución iterativos para la versión algebraica del problema se construye. El método se basa en una formulación híbrida del problema combinado con un esquema de direcciones alternadas. Estos métodos se han diseñado para generalizarlos de forma que puedan resolver la versión paramétrica del problema siguiendo una estrategia llamada Descomposición Propia Generalizada (PGD). El método de resolución para el problema paramétrico calcula las incógnitas paramétricas usando la técnica PGD. El algoritmo sigue los mismo pasos que el algoritmo algebraico, pero algunas operaciones se llevan a cabo en el ambiente PGD, esto requiere algoritmos iterativos anidados. El método de resolución PGD se acompaña con una evaluación del error cometido permitiendo monitorizar la convergencia de los procesos iterativos y decidir el número de términos que requiere la solución para alcanzar la precisión preescrita. Diferentes ejemplos de redes reales y tests estándar se usan para demostrar el funcionamiento de las metodologías propuestas.
Wu, Wei. "Research on loop flow problem and its solutions in Macau power system". Thesis, University of Macau, 2003. http://umaclib3.umac.mo/record=b1807202.
Texto completoMcCraney, Joshua Thomas. "Analysis of Capillary Flow in Interior Corners : Perturbed Power Law Similarity Solutions". PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2725.
Texto completoBukhsh, Waqquas Ahmed. "Islanding model for preventing wide-area blackouts and the issue of local solutions of the optimal power flow problem". Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9671.
Texto completoEbrahimpour, Mohammad Reza. "An analytical study of the power flow equations with applications to systems with multiple close solutions". Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/15746.
Texto completoCheng, Yu Syuan y 鄭宇軒. "Pareto optimal solution and optimal multiobjective solution for risk-limiting optimal power flow". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/9jeguw.
Texto completoLiu, Min-Fun y 劉明芳. "A NETWORK-CLUSTER METHOD FOR POWER FLOW SOLUTION BASED ON MULTI-PROCESSORS". Thesis, 1994. http://ndltd.ncl.edu.tw/handle/65223311269577033103.
Texto completo國立成功大學
電機工程研究所
82
In this paper, we utilize the multi-processors for investigating the solution of power flow in two ways. First, by properly clustering and sorting the Jacobi matrix, we transform the matrix into a block diagonal form. Most of the non-zero entries are now gathered near the main diagonal. We then investigate the effect that the number of non-zero entries of non-diagonal blocks will have on the convergence of the solution. The multi-processors are adopted to get all the solutions.Secondly, we perform clustering directly from the network. Then we can obtain a border block diagonal form of the Jacobi matrix. Since the parallel processing of multi- processors can be applied to it, the execution time is largely reduced. We have implemented our method to cluster the IEEE-30, 57, and 118 bus network testing systems. From the experimental results, we see that our method requires less execution time when comparing with the traditional method using sequential computing.
CHEN, XIN-DE y 陳新得. "A study on the uniqueness of load flow solution for radial distribution power networks". Thesis, 1991. http://ndltd.ncl.edu.tw/handle/63499700427094213083.
Texto completoChen, Shibing. "Convex Solutions to the Power-of-mean Curvature Flow, Conformally Invariant Inequalities and Regularity Results in Some". Thesis, 2013. http://hdl.handle.net/1807/43516.
Texto completoLiu, Jen-Sen y 劉振森. "Modeling and Numerical Solution of Power Flow Computation for Ungrounded DC Rail Traction System Using Ladder Circuits". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/cmz25b.
Texto completo國立臺北科技大學
電機工程系博士班
102
Accurate solution of ungrounded DC rail system load flow requires the inclusion of detailed negative path components in the traction power network circuit model, resulting in large numbers of circuit nodes and branches. Such modeling complexity brings about heavy computational burden, ill numerical conditions, and nonlinear circuit components not readily solved for by nodal equations. In this dissertation we present a novel methodology utilizing the ladder-circuit topology of ungrounded DC rail traction networks to perform accurate and efficient load flow computation. We first study the circuit configuration of traditional grounded traction networks, and introduce a ladder-circuit load flow solution formulation based on the similarity to AC radial power distribution systems. Compare with the common-used nodal equation formulation, this solution scheme can do without large scale simultaneous circuit equations or the need to perform large-dimensional matrix manipulations, hence can achieve computational efficiency as well as numerical stability. Modern ungrounded DC traction power systems have cross bondings in the negative return circuits to reduce resistance, adding more complexity and asymmetry to the traction circuit. Thus we propose an approximate model of the so-called double ladder circuit to preserve the simplicity of grounded DC track networks without sacrificing analytical accuracy. The ladder circuit model is implemented by diakoptics to decompose an ungrounded DC traction networks into individual track circuits and substations. By iterative solution of load flows in two loops of calculations for track circuit layers and substation layers, respectively, the proposed algorithm requires computational burden proportional to the number of substations and track circuits. The computation results from two transit lines in Taiwan show that the proposed algorithm achieves the objectives of computational proficiency, numerical robustness, and versatility to various network configurations such as branch lines.
"Solving for the Low-Voltage/Large-Angle Power-Flow Solutions by using the Holomorphic Embedding Method". Doctoral diss., 2015. http://hdl.handle.net/2286/R.I.34817.
Texto completoDissertation/Thesis
Doctoral Dissertation Electrical Engineering 2015
Armistead, Robert Bernard. "MPI-based Parallel Solution of Sparse Linear Systems Using Chio's Condensation Algorithm and Test Data from Power Flow Analysis". 2010. http://trace.tennessee.edu/utk_gradthes/601.
Texto completoLiu, Jen-Sen y 劉振森. "Solution of DC Power Flow for Non-grounded Traction Systems Using Chain-rule Reduction of Ladder Circuit Jacobian Matrices". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/36315839882462607911.
Texto completo國立臺北科技大學
電機工程系碩士班
90
Traditionally DC power flow of traction systems are based on grounded load model. That is, like AC power system, each train is modeled as a load with power feeding from the third rail to ground. This model was appropriate for grounded DC traction systems in early days. As the trend migrating to non-grounded systems, the negative return path is batter described as a sequence of nodes and impedance among them, similar to the positive path. Together the circuit is of ladder-like configuration and can be solved using nodel circuit analysis and other computational algorithms. Numerical methods such as Newton-Raphson method are usually applied to implement DC power flow solution techniques. The dimension of the Jacobian matrices for Newton-Raphson methods grows with the complexity of the network, namely, the total number of nodes in the network. Our approach first solves each ladder circuit between two adjacent traction substations (TSS) in the inner loop using chain rule to convert the Jacobian matrix into the product of a sequence of small Jacobian matrices. This can reduce the computational complexity dramatically as matrix inversion is involved. Then power flow into all ladder circuits and output of each TSS are calculated in the outer loop. Finally, iterative procedures are repeated to obtain the complete DC power solution. We apply our method to a section of the planned extension of the Orange line of Taipei rapid transit system. The results show that both the inner and outer loops converge in a few iterations. Moreover, by decoupling power flow computation of each ladder circuit with the whole network we can make it easier to combine it with train performance simulation to obtain more accurate transit system simulation.
Blaette, Lutz. "Vortex Driven Acoustic Flow Instability". 2011. http://trace.tennessee.edu/utk_graddiss/951.
Texto completoAvalos, Munoz Jose Rafael. "Analysis and Application of Optimization Techniques to Power System Security and Electricity Markets". Thesis, 2008. http://hdl.handle.net/10012/3692.
Texto completoNiu, Yun. "Transmission congestion solutions by optimal power flow and load management". Thesis, 2002. http://hdl.handle.net/2429/12149.
Texto completoYeh, Guey-Haw y 葉桂華. "A Novel Algorithm to Compute All the Type-1 Power Flow Solutions". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/22623102724411724528.
Texto completo國立臺灣大學
電機工程學系
86
This thesis presents a novel, numerically efficient algorithm, which is base don Continuation Power Flow to compute all the type-1 power flow solutions. Ty pe-1solutions are used in conjunction with techniques such as energy methods a nd thevoltage instability proximity index for assessing system voltage instabi lity.
Magan, Avnish Bhowan. "Group invariant solutions and conservation laws for jet flow models of non-Newtownian power-law fluids". Thesis, 2014. http://hdl.handle.net/10539/14926.
Texto completoSaad, Tony. "Theoretical Models for Wall Injected Duct Flows". 2010. http://trace.tennessee.edu/utk_graddiss/748.
Texto completo