Relevant bibliographies by topics / Backward/Forward Sweep

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Backward/Forward Sweep'

Author: Grafiati
Published: 3 June 2025
Last updated: 23 June 2025

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Journal articles on the topic "Backward/Forward Sweep"

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Adamu, Samuel, Adamu M. Alkali, and Mathew Remileku Odekunle. "RUNGE–KUTTA LIKE METHOD FOR THE SOLUTION OF OPTIMAL CONTROL MODEL OF REAL INVESTMENT AND FISH MANAGEMENT." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 15, no. 2 (2024): 155–69. http://dx.doi.org/10.61841/turcomat.v15i2.14646.

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This study develops the Runge-Kutta Like Method (RKLM), which uses Pontryagin's principle to solve optimal control problems numerically using forward-backward sweep methods. It is based on the Patade and Bhalekar methodology. The RKLM's stability properties and its convergence are examined. The Forward-backward sweep algorithm and the RKLM algorithm are implemented using MATLAB code. Physical optimum control problems are solved with the RKLM. The first problem's conclusion demonstrates that, when investment declines, the capital first grow to boost production before it depreciates. The outcome of the second problem demonstrates that a larger weight parameter causes the harvesting rate to reach zero more quickly and the total fish mass to reach its maximum level more quickly. The findings obtained demonstrate the effectiveness of using RKLM in conjunction with forward-backward sweep methods to solve optimal control problems.
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Adamu, Samuel, O. O. Aduroja, and K. Bitrus. "NUMERICAL SOLUTION TO OPTIMAL CONTROL PROBLEMS USING COLLOCATION METHOD VIA PONTRYAGIN’S PRINCIPLE." FUDMA JOURNAL OF SCIENCES 7, no. 5 (2023): 228–33. http://dx.doi.org/10.33003/fjs-2023-0705-2016.

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In this study, Lucas polynomial approximate solution is considered to develop a collocation technique for solving optimal control problems with implementation in block using forward backward sweep method. The collocation block method developed is stable and convergent. The method is implemented using MATLAB code, and the examples show that forward-backward sweep methods with the collocation method is an efficient technique for solving optimal control problems as compared with some existing methods.
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Ouali, Saad, and Abdeljabbar Cherkaoui. "An Improved Backward/Forward Sweep Power Flow Method Based on a New Network Information Organization for Radial Distribution Systems." Journal of Electrical and Computer Engineering 2020 (January 17, 2020): 1–11. http://dx.doi.org/10.1155/2020/5643410.

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This paper presents a load flow algorithm based on the backward/forward sweep principle, flexible with network topology changes, with an improvement in ensuring a minimum number of searching for connections between nodes in the calculation sequence in the forward and the backward sweep, by organizing the radial distribution system information into a main line and its derivations. The proposed load flow analysis is easy to implement and does not require the use of any complex renumbering of branches and nodes, or any matrix calculation, with the only use of linear equations based on Kirchhoff’s formulation.
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Kim, Ho-Young, Ji-Soo Kim, Jin-Sol Song, Gwang-Su Shin, and Chul-Hwan Kim. "A Study on Development of Hosting Capacity Assessment Tool using Forward-Backward Sweep Method." Transactions of The Korean Institute of Electrical Engineers 70, no. 8 (2021): 1220–24. http://dx.doi.org/10.5370/kiee.2021.70.8.1220.

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Kodama, H., and M. Namba. "Unsteady Lifting Surface Theory for a Rotating Cascade of Swept Blades." Journal of Turbomachinery 112, no. 3 (1990): 411–17. http://dx.doi.org/10.1115/1.2927675.

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A lifting surface theory is developed to predict the unsteady three-dimensional aerodynamic characteristics for a rotating subsonic annular cascade of swept blades. A discrete element method is used to solve the integral equation for the unsteady blade loading. Numerical examples are presented to demonstrate effects of the sweep on the blade flutter and on the acoustic field generated by interaction of rotating blades with a convected sinusoidal gust. It is found that increasing the sweep results in decrease of the aerodynamic work on vibrating blades and also remarkable reduction of the modal acoustic power of lower radial orders for both forward and backward sweeps.
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Teng, Jen-Hao, and Chuo-Yean Chang. "Backward/Forward Sweep-Based Harmonic Analysis Method for Distribution Systems." IEEE Transactions on Power Delivery 22, no. 3 (2007): 1665–72. http://dx.doi.org/10.1109/tpwrd.2007.899523.

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McAsey, Michael, Libin Mou, and Weimin Han. "Convergence of the forward-backward sweep method in optimal control." Computational Optimization and Applications 53, no. 1 (2012): 207–26. http://dx.doi.org/10.1007/s10589-011-9454-7.

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Sunday, Adeleke Salimon, Adedapo Aderinko Hassan, Ibukun Damilola Fajuke, and Akinkunmi Suuti Kamilu. "Load Flow Analysis of Nigerian Radial Distribution Network Using Backward/Forward Sweep Technique." Journal of VLSI Design and its Advancement 2, no. 3 (2019): 1–11. https://doi.org/10.5281/zenodo.3582970.

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<em>Load flow analysis is an essential and vital part in power system studies. Conventional flow methods such as Newton Raphson and Gauss Seidel are not accurate for radial distribution networks due to its radial topology and high resistance to reactance ratio. In this paper, the backward-forward load flow technique which utilizes the equivalent current injection (ECI), the node injection to branch current (BIBC) and branch current to node-voltage matrix (BCBV). This algorithm was tested on Yale 17-bus and Imalefalafia 32-bus Nigerian radial distribution networks. The analyses of the networks were obtained in a very short computation time. The results revealed the viability of the method is useful for planning, operation of the Nigerian radial distribution networks.</em> &nbsp;
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Shan, Peng. "Kinematic Analysis of 3-D Swept Shock Surfaces in Axial Flow Compressors." Journal of Turbomachinery 123, no. 3 (2000): 490–500. http://dx.doi.org/10.1115/1.1370159.

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This paper is part II of a comprehensive study on the blade leading edge sweep/bend of supersonic and transonic axial compressors. The paper explores and analyzes the kinematic characteristic variables of three-dimensional (3-D) swept shock surfaces. In the research field studying the sweep aerodynamics of axial flow compressors and fans, many types of high loading swept blades are under intensive study. So, in both direct and inverse design methods and experimental validations, an accurate grasp of the sweep characteristic of the blade’s 3-D swept shock surface becomes of more concern than before. Associated with relevant blading variables, this paper studies the forward and zero and backward sweeps of shock surfaces, defines and resolves every kind of useful sweep angle, obtains dimensionless sweep similarity factors, suggests a kind of method for the quantitative classification of 3-D shock structures, and proposes the principle of 3-D shock structure measurements. Two rotor blade leading edge shock surfaces from two high loading single stage fans are analyzed and contrasted. This study is the foundation of the kinematic design of swept shock surfaces.
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Kumar, Abhimanyu, Abhishek Kumar, Rammohan Mallipeddi, and Dong-Gyu Lee. "Adaptive Backward/Forward Sweep for Solving Power Flow of Islanded Microgrids." Energies 15, no. 24 (2022): 9348. http://dx.doi.org/10.3390/en15249348.

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This paper presents an algorithm for solving the power flow (PF) problem of droop-regulated AC microgrids (DRACMs) operating in isolated mode. These systems are based on radial distribution networks without having a slack bus to facilitate conventional computations. Moreover, distributed generation units have to distribute the power and voltage regulation among themselves as a function of operating frequency and voltage droop rather than having a slack bus that regulates voltage and power demands. Based on the conventional backward/forward sweep algorithm (BFS), the proposed method is a derivative-free PF algorithm. To manage the absence of a slack bus in the system, the BFS algorithm introduces new loops, equations, and self-adaptation procedures to its computation procedures. A comparison is presented between the proposed BFS algorithm and other state-of-the-art PF algorithms, as well as PSCAD/EMTDC. In comparison to existing algorithms, the proposed approach is fast, simple, accurate, and easy to implement, and it can be considered an effective tool for planning and analyzing islanded DRACMs.
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Dissertations / Theses on the topic "Backward/Forward Sweep"

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Pantuzi, André Valdir [UNESP]. "Desempenho de um algoritmo backward-forward sweep de cálculo de fluxo de potência." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/87260.

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Made available in DSpace on 2014-06-11T19:22:35Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-04-26Bitstream added on 2014-06-13T19:48:59Z : No. of bitstreams: 1 pantuzi_av_me_ilha.pdf: 1781418 bytes, checksum: 8c96b8f3bf6cc971c43ea4aa045c10fb (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Neste trabalho investigou-se o desempenho de um algoritmo de cálculo de fluxo de potência trifásico baseado em um método de varredura chamado backward forward sweep. O estudo desenvolveu-se para sistemas de distribuição de energia elétrica radiais e/ou radiais fracamente malhados, sendo que o foco principal foi a avaliação do processo de convergência e exatidão do método de fluxo de potência. Para tal finalidade investigou-se variadas situações de redes, tais como: barras conectadas com linhas longas e linhas curtas, presença de reguladores de tensão, presença de geração distribuída, presença de linhas com representação shunt, sistemas com carregamento leve, carregamento médio e carregamento pesado, desequilíbrio de cargas entre as fases (a, b e c), influência de modelos de cargas (potência constante, admitância constante e corrente constante) etc. O método backward-forward sweep é bem conhecido e discutido na literatura, porém uma análise de desempenho com todos os detalhes de modelos existentes nas redes de distribuição não é encontrada. Encontram-se análises com modelos isolados, ou seja, considerando somente redes fracamente malhadas, ou com barras com tensão controlada, ou com modelos de transformadores etc. Muitos destes estudos apresentaram resultados apenas para redes de pequeno porte, pois na maioria dos casos o objetivo principal era validar os modelos. Neste trabalho buscou-se desenvolver um estudo completo de desempenho e confiabilidade de uma implementação do método backward-forward sweep. Assim foram utilizadas redes de distribuição reais e fictícias encontradas na literatura, com as mais variadas topologias, incluindo ramais monofásicos (MRT), diferentes níveis de carregamento, cargas desequilibradas e diversos modelos de componentes de rede.<br>At this work an algorithm of calculation on three-phase power flow was investigated based on a sweeping method called backward forward sweep. The study was developed for radial electric power distribution networks and/or weakly interconnected radial ones, and the main focus was the evaluation of the convergence process and accuracy of the method of power flow. For such a purpose it was investigated varied situations of networks, such as: connected bars with long lines and short lines, voltage regulators presence, distributed generation presence, lines with representation shunt, systems with light, medium and heavy loading, unbalanced of loads among the phases (a, b and c) and influence of loads models (constant power, constant current and constant admittance). The method backward-forward sweep is very known and discussed in the literature, however an analysis with all the details of existent models in the distribution networks is not found. They are analyses with isolated models, in other words, considering only networks weakly interconnected, or with bars with controlled voltage, or with models of transformers. Many of these studies presented resulted just for networks of small load, because in most of the cases the main objective was to validate the models. In this work it was looked for to develop a complete study and reliability of an implementation of the method backward-forward sweep. Like this real and fictitious distribution networks were used found in the literature, with the most varied topologies, including monophase extensions (MRT), different loading levels, unbalanced loads and several models of networks components.
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Pantuzi, André Valdir. "Desempenho de um algoritmo backward-forward sweep de cálculo de fluxo de potência /." Ilha Solteira : [s.n], 2006. http://hdl.handle.net/11449/87260.

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Orientador: Antonio Padilha Feltrin<br>Banca: Sergio Azevedo de Oliveira<br>Banca: José Aquiles Baesso Grimoni<br>Resumo: Neste trabalho investigou-se o desempenho de um algoritmo de cálculo de fluxo de potência trifásico baseado em um método de varredura chamado backward forward sweep. O estudo desenvolveu-se para sistemas de distribuição de energia elétrica radiais e/ou radiais fracamente malhados, sendo que o foco principal foi a avaliação do processo de convergência e exatidão do método de fluxo de potência. Para tal finalidade investigou-se variadas situações de redes, tais como: barras conectadas com linhas longas e linhas curtas, presença de reguladores de tensão, presença de geração distribuída, presença de linhas com representação shunt, sistemas com carregamento leve, carregamento médio e carregamento pesado, desequilíbrio de cargas entre as fases (a, b e c), influência de modelos de cargas (potência constante, admitância constante e corrente constante) etc. O método backward-forward sweep é bem conhecido e discutido na literatura, porém uma análise de desempenho com todos os detalhes de modelos existentes nas redes de distribuição não é encontrada. Encontram-se análises com modelos isolados, ou seja, considerando somente redes fracamente malhadas, ou com barras com tensão controlada, ou com modelos de transformadores etc. Muitos destes estudos apresentaram resultados apenas para redes de pequeno porte, pois na maioria dos casos o objetivo principal era validar os modelos. Neste trabalho buscou-se desenvolver um estudo completo de desempenho e confiabilidade de uma implementação do método backward-forward sweep. Assim foram utilizadas redes de distribuição reais e fictícias encontradas na literatura, com as mais variadas topologias, incluindo ramais monofásicos (MRT), diferentes níveis de carregamento, cargas desequilibradas e diversos modelos de componentes de rede.<br>Abstract: At this work an algorithm of calculation on three-phase power flow was investigated based on a sweeping method called backward forward sweep. The study was developed for radial electric power distribution networks and/or weakly interconnected radial ones, and the main focus was the evaluation of the convergence process and accuracy of the method of power flow. For such a purpose it was investigated varied situations of networks, such as: connected bars with long lines and short lines, voltage regulators presence, distributed generation presence, lines with representation shunt, systems with light, medium and heavy loading, unbalanced of loads among the phases (a, b and c) and influence of loads models (constant power, constant current and constant admittance). The method backward-forward sweep is very known and discussed in the literature, however an analysis with all the details of existent models in the distribution networks is not found. They are analyses with isolated models, in other words, considering only networks weakly interconnected, or with bars with controlled voltage, or with models of transformers. Many of these studies presented resulted just for networks of small load, because in most of the cases the main objective was to validate the models. In this work it was looked for to develop a complete study and reliability of an implementation of the method backward-forward sweep. Like this real and fictitious distribution networks were used found in the literature, with the most varied topologies, including monophase extensions (MRT), different loading levels, unbalanced loads and several models of networks components.<br>Mestre
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Beharrysingh, Shiva. "Phase unbalance on low-voltage electricity networks and its mitigation using static balancers." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/16252.

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Existing low-voltage networks may not accommodate high penetrations of low-carbon technologies. The topic of this thesis is unbalance, which if minimised can delay or avoid the constraining of these technologies or the replacing of still-useful network assets. Most of the discussion on unbalance, as seen in the standards and the literature, centres on the effects of voltage unbalance on consumer equipment. Its effects on the network are not equally reported. This thesis recognises fundamental differences between the consumer and network perspectives. It can inform distribution network operators on the interpretation of measurements taken on low-voltage networks and guide research on unbalance due to high penetrations of low-carbon technologies. Much of the work involved simulations of LV networks. Initially, existing 3 x 3 or 5 x 5 approaches to the forward-backward sweep method were thought suitable. After a review of these approaches however, there were doubts as to how accurately they accounted for the shared neutral-earth return path on which the out-of-balance current flows. This led to the derivation of a new 5 x 5 approach using only Kirchhoff s voltage (KVL) and current laws (KCL). Its results are validated thoroughly in the thesis. In addition to satisfying KVL and KCL, they match Matlab SimPowerSystems exactly and are in close agreement with measurements taken on a very unbalanced rural feeder. This thesis also investigates the mitigation of unbalance using the static balancer. This is a transformer with a single interconnected-star winding. It was used in 1930-1950s to correct unbalance. Contributions are made for its possible re-introduction as a retrofit option. They include a model for use in the forward-backward sweep method, validated by laboratory and field measurements, and the quantification of the static balancer s strengths and weaknesses as this can help identify when it should be used.
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Carvalho, Marcus Rodrigo. "Estudo de técnicas eficientes para a resolução do problema de fluxo de potência para sistemas de distribuição radial." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-27072006-164213/.

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Este trabalho descreve uma abordagem do método primal-dual barreira logarítmica (MPDBL) associado ao método de Newton modificado para a resolução do problema de fluxo de potência para sistemas de distribuição radial. Também foi realizado um estudo comparativo com duas técnicas clássicas de solução do problema de fluxo potência para redes de distribuição radial. São os métodos: Backward/Forward Sweep e o método proposto por M. Baran e F. Wu, que é baseado na técnica de Newton-Raphson. Este método utiliza uma matriz Jacobiana modificada que atende a característica radial dos sistemas de distribuição. Nos testes comparativos serão considerados todos os parâmetros do sistema. Os algoritmos de solução serão analisados em suas propriedades de convergência e será realizado um teste de robustez. Os resultados dos testes realizados em 4 sistemas (4, 10, 34 e 70 barras) e o teste comparativo entre os métodos evidenciam a melhor metodologia na solução do problema de fluxo de potência para sistemas radiais<br>This work describes an approach on primal-dual logarithmic barrier method (PDLBM) associate to the method of Newton modified for the resolution of the problem of power flow for radial distribution systems. Also a comparative study with two classic techniques of solution of the flow problem was carried through power for nets of radial distribution. They are the methods: Backward/Forward Sweep and the method considered for M. Baran and F. Wu, that is based on the technique of Newton-Raphson. This method uses modified Jacobiana matrix that takes care of the radial characteristic of the distribution systems. In the comparative tests all will be considered the parameters of the system. The solution algorithms will be analyzed in its properties of convergence and will be carried through a robustness test. The results of the tests carried through in 4 systems (4, 10, 34 and 70 bus) and the comparative test between the methods evidence the best methodology in the solution of the problem of power flow for radial systems
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Amaral, Filho Nélio Alves do. "Contribuições em modelos e na análise do método BFS." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/6130.

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Submitted by Geandra Rodrigues (geandrar@gmail.com) on 2017-12-22T14:07:13Z No. of bitstreams: 1 nelioalvesdoamaralfilho.pdf: 3229871 bytes, checksum: c82c698f342f6b908377149e4abe130a (MD5)<br>Rejected by Adriana Oliveira (adriana.oliveira@ufjf.edu.br), reason: Favor corrigir autor: Autor(es): Filho, Nélio Alves do Amaral Favor verificar no Lattes se Araúno tem ou não acento Primeiro Orientador: Araujo, Débora Rosana Ribeiro Penido Co-orientador: Araujo, Leandro Ramos de on 2018-01-22T18:24:16Z (GMT)<br>Submitted by Geandra Rodrigues (geandrar@gmail.com) on 2018-01-22T18:28:56Z No. of bitstreams: 1 nelioalvesdoamaralfilho.pdf: 3229871 bytes, checksum: c82c698f342f6b908377149e4abe130a (MD5)<br>Rejected by Adriana Oliveira (adriana.oliveira@ufjf.edu.br), reason: Favor corrigir: Autor(es): Filho, Nélio Alves do Amaral Verificar se os sobrenomes Araújo tem ou não acento on 2018-01-24T12:13:21Z (GMT)<br>Submitted by Geandra Rodrigues (geandrar@gmail.com) on 2018-01-24T12:29:33Z No. of bitstreams: 1 nelioalvesdoamaralfilho.pdf: 3229871 bytes, checksum: c82c698f342f6b908377149e4abe130a (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-01-24T13:46:23Z (GMT) No. of bitstreams: 1 nelioalvesdoamaralfilho.pdf: 3229871 bytes, checksum: c82c698f342f6b908377149e4abe130a (MD5)<br>Made available in DSpace on 2018-01-24T13:46:23Z (GMT). No. of bitstreams: 1 nelioalvesdoamaralfilho.pdf: 3229871 bytes, checksum: c82c698f342f6b908377149e4abe130a (MD5) Previous issue date: 2017-11-24<br>Este trabalho propõe a apresentação e o desenvolvimento computacional de um algoritmo para solução de fluxo de potência em sistemas de distribuição baseado no método Backward Forward Sweep (BFS). No algoritmo foram consideradas as principais etapas do método tradicional e algumas estratégias propostas isoladamente em trabalhos na literatura. Além disso, propõe-se a incorporação da representação do acoplamento eletromagnético entre alimentadores em paralelo nos modelos de linhas, e estudos do impacto dessa representação nos cálculos de fluxo de potência usando o BFS. Apresenta-se também, de maneira detalhada, uma maneira de implementar o controle de tape dos reguladores de tensão no método BFS. Tais questões são normalmente negligenciadas ou não são explicitadas nos trabalhos encontrados na literatura que envolvem o método analisado. Análises detalhadas do método BFS também são realizadas e apresentadas neste trabalho. Evidências analíticas são desenvolvidas para sustentar essas análises, bem como os resultados obtidos. Neste trabalho também é feita uma comparação entre o método BFS desenvolvido e um método baseado em Newton-Raphson para solução de sistemas de distribuição. As análises realizadas têm como foco principal a investigação do comportamento desses métodos quando são levados a operar em pontos considerados críticos para convergência. Para isso, são analisados fatores como a variação da relação X/R, o aumento do carregamento, o impacto da modelagem de carga (modelo ZIP) e o impacto da presença dos reguladores de tensão.<br>This work proposes the presentation and the computational development of an algorithm for power flow solution in distribution systems based on the Backward Forward Sweep (BFS) method. The algorithm contains the main steps of the traditional method and some strategies proposed separately in works in the literature. In addition, it is proposed the incorporation of the representation of the electromagnetic coupling between feeders in parallel in the line models, and studies of the impact of this representation in the power flow calculations using the BFS. A way to implement the tape control of the voltage regulators in the BFS method is also presented in detail. Such questions are usually neglected or not deeply explained in the works found in the literature that involve the analyzed method. A detailed analyzes of the BFS method are also performed and presented in this work. Some analytical evidence is developed to support these analyzes, as well as the results obtained. In this work a comparison is also made between the developed BFS method and a Newton-Raphson-based method for the distribution systems solution. The analyzes made have as main focus the investigation of the behavior of these methods when they are taken to operate in points considered critical for convergence. For this, factors such as the variation of the X/R ratio, the load’s increase up, the impact of the load modeling (ZIP model) and the impact of the presence of the voltage regulators are analyzed.
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Häggblom, Johan, and Jonathan Jerner. "Photovoltaic Power Production and Energy Storage Systems in Low-Voltage Power Grids." Thesis, Linköpings universitet, Fordonssystem, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-156875.

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In recent years, photovoltaic (PV) power production have seen an increase and the PV power systems are often located in the distribution grids close to the consumers. Since the distributions grids rarely are designed for power production, investigation of its effects is needed. It is seen in this thesis that PV power production will cause voltages to rise, potentially to levels exceeding the limits that grid owners have to abide by. A model of a distribution grid is developed in MathWorks MATLAB. The model contains a transformer, cables, households, energy storage systems (ESS:s) and photovoltaic power systems. The system is simulated by implementing a numerical Forward Backward Sweep Method, solving for powers, currents and voltages in the grid. PV power systems are added in different configurations along with different configurations of ESS:s. The results are analysed, primarily concerning voltages and voltage limits. It is concluded that addition of PV power production in the distribution grid affects voltages, more or less depending on where in the grid the systems are placed and what peak power they have. It is also concluded that having energy storage systems in the grid, changing the power factor of the inverter for the PV systems or lowering the transformer secondary-side voltage can bring the voltages down.<br>På senare tid har det skett en ökning i antalet solcellsanläggningar som installeras i elnätet och dessa är ofta placerade i distributionsnäten nära hushållen. Eftersom distributionsnäten sällan är dimensionerade för produktion så behöver man utreda effekten av det. I det här arbetet visas det att solcellsproduktion kommer att öka spänningen i elnätet, potentiellt så mycket att de gränser elnätsägarna måste hålla nätet inom överstigs. En modell över lågspänningsnätet skapas i MathWorks MATLAB. Modellen innehåller transformator, kablar, hushåll, energilager och solcellsanläggningar. Systemet simuleras med hjälp av en numerisk Forward Backward Sweep-lösare som beräknar effekter, strömmar och spänningar i elnätet. Solcellanläggningarna placeras ut i elnätet i olika konfigurationer tillsammans med olika konfigurationer av energilager. Resultaten från simuleringarna analyseras främst med avseende på spänningen i elnätet utifrån dess gränser. De slutsatser som dras i arbetet är att solcellsproduktion kommer att påverka spänningen, mycket beroende på var i elnätet anläggningarna placeras och storleken hos dem. Det visas också att energilager, justering av effektfaktor hos solcellsanläggningarna eller en spänningssänkning på transformatorns lågspänningssida kan få ner spänningen i elnätet.<br><p>LiTH-ISY-EX--19/5194--SE</p>
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Sharp, Jesse A. "Numerical methods for optimal control and parameter estimation in the life sciences." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/230762/1/Jesse_Sharp_Thesis.pdf.

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This thesis concerns numerical methods in mathematical optimisation and inference; with a focus on techniques for optimal control, and for parameter estimation and uncertainty quantification. Novel methodological and computational developments are presented, with a view to improving the efficiency, effectiveness and accessibility of these techniques for practitioners. The numerical methods considered in this work are widely applied throughout the life sciences; in areas including ecology, epidemiology and oncology, and beyond the life sciences; in engineering, economics, aeronautics and other disciplines.
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Vargas, Peralta Rommel Gregorio. "Reconfiguração de sistemas de distribuição através do algoritmo genético de chaves aleatórias viciadas." Ilha Solteira, 2018. http://hdl.handle.net/11449/154501.

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Orientador: John Fredy Franco Baquero<br>Resumo: Nesta dissertação é proposta a aplicação do algoritmo genético de chaves aleatórias viciadas para a solução do problema de reconfiguração de sistemas de distribuição. Esse problema de otimização consiste em encontrar a configuração radial que apresenta perdas mínimas, satisfazendo as restrições topológicas e as restrições operacionais, sendo modelado como um problema de Programação Não Linear Inteira Mista. O método proposto utiliza o algoritmo de Prim na geração de configurações radiais e emprega um algoritmo de fluxo de carga de varredura para avaliar cada proposta de solução. O algoritmo genético de chaves aleatórias viciadas foi desenvolvido na linguagem de programação FORTRAN e foi testado em quatro sistemas de distribuição da literatura especializada (14 barras, 33 barras, 84 barras e 136 barras). Os resultados obtidos da aplicação do algoritmo permitem avaliar o seu desempenho e eficiência em comparação com a melhor solução encontrada na literatura especializada.<br>Abstract: The application of the biased random-key genetic algorithm for the reconfiguration of distribution systems is proposed in this Dissertation. The problem of reconfiguration in distribution systems consists of finding the radial configuration that presents the minimum losses, satisfying topological and operating constraints and is commonly modeled as a mixed-integer nonlinear programming problem. The proposed method uses the Prim's algorithm to generate radial configurations that are evaluated through a backward/forward sweep power flow method. The biased random-key genetic algorithm used was developed in the programming language FORTRAN and was tested in four systems (14-bus, 33-bus, 84-bus and 136-bus). The obtained results show the performance and efficiency of the proposed method in comparison to the best solution found in the specialized literature.<br>Mestre
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Sarmiento, Jonattan Emanuel. "Modelagem de inversores em fluxo de potência considerando suporte de potência reativa como serviço ancilar na distribuição." Universidade Estadual do Oeste do Paraná, 2016. http://tede.unioeste.br:8080/tede/handle/tede/1034.

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Made available in DSpace on 2017-07-10T16:41:34Z (GMT). No. of bitstreams: 1 Dissert Jonattan Emanuel Sarmiento2.pdf: 1326992 bytes, checksum: eeb1918a0e5e9c45ad54043cd1ea9c5e (MD5) Previous issue date: 2016-06-23<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>In recent years there has been a great increase in the use of distributed generators. This occurred not only by advances in production technologies of small generators and frequency inverters, but also by the benefits that brings to the distribution systems and the incentive policies. In the analysis of these systems is essential to calculate the power flow and properly solve it and the modeling of the inverter should be reviewed together with its implementation in the method employed, attempting to the fact that the inverters are beginning to use advanced functions that can to provide ancillary services. In this work the modelling of inverter with advanced functions such as Basic Intelligent Volt-Var Control (BIVV) and Intelligent Volt-Var With Hysteresis (IVVH) are reviewed, therefore it is propose methods the implements this models in the method sweep. In proposal implementation it is use of elements of the sensitivity matrix of nodes PV defined in the compensation method. In the analyzed cases, the implementations were effectiveness achieving solutions in convergent values and in accordance to the control strategies. In the results of simulations there were differences in the operating points of the inverter acting on a node of the distribution system comparing the different modeling analyzed in different system load conditions and different levels of active power supply. When comparing the voltage profiles of the various modeling, in general notice that there is a greater variation when it has large reactive power capacity. If in the future of distributed generation evolve to provide reactive support as the ancillary service, it shall be careful properly modelling the inverter avoiding mistaken results that will affect the plans of the concessionaires.<br>Nos últimos anos verificou-se um grande aumento no uso de geradores distribuídos. Isso ocorreu não apenas pelos avanços nas tecnologias de produção de pequenos geradores e inversores de frequência, mas também pelos benefícios que estes trazem aos sistemas de distribuição e pelas políticas de incentivos. Nas análises desses sistemas é fundamental calcular o fluxo de potência e, para resolvê-lo adequadamente, deve-se revisar a modelagem do inversor e sua implementação no método empregado, atentando-se ao fato de que os inversores estão começando a utilizar funções avançadas passíveis de fornecer serviços ancilares. Neste trabalho são revisadas as modelagens dos inversores com funções avançadas, tais como o controle Basic Intelligent Volt-Var (BIVV) e Intelligent Volt-Var With Hysteresis (IVVH), além de propor métodos de implementação para o método da varredura. Nas implementações propostas se faz uso de elementos da matriz de sensibilidade dos nós PV definida no método da compensação. Nos casos analisados, as implementações tiveram eficácia, conseguindo atingir soluções em valores convergentes e em concordância às estratégias de controle. Já nos resultados das simulações, ilustram-se as diferenças dos pontos operativos do inversor atuando em um nó do sistema de distribuição comparando-se as diferentes modelagens analisadas em distintas condições de carga do sistema e diversos níveis de fornecimento de potência ativa. Ao comparar-se os perfis de tensão das diversas modelagens, em geral, nota-se que há uma variação maior quando se tem maior capacidade de potência reativa. Se no futuro a geração distribuída evoluir para prestar suporte de potência reativa como um serviço ancilar, é necessário tomar precauções para modelar adequadamente o inversor, de modo a evitar obter resultados equivocados que afetarão os planejamentos das concessionárias.
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Chu, Shou-Yung, and 朱守勇. "A Modified Forward and Backward Sweep Method for Radial Distribution Load Flow Analysis." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/44501508379022743394.

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博士<br>國立中正大學<br>電機工程所<br>96<br>Load flow analysis is the most fundamental work for power system operation and planning. In transmission systems, the network is always treated as balanced. Then, the load flow problem for transmission system can be dealt by single-phase method. However, the distribution power system is unbalanced inherently because of unsymmetrical network and unbalanced loads. In such situation, the conventional load flow methods for transmission systems are not suitable for distribution systems. In addition, high R/X ratio and radial structure are also to restrict the use of single-phase load flow approaches. Therefore, the three-phase approaches are required for distribution system load flow studies. The thesis proposes an improved forward/backward sweep algorithm for three-phase load flow analysis of radial distribution systems. In the backward sweep, the KCL and KVL are used to calculate each line current and the upstream bus voltage of each line or a transformer branch. Then, linear proportion principle for finding the real and imaginary ratios on each line section and bus index for fast mapping the terminal bus at each branch are exploited in the forward sweep to update the voltage at each junction or each terminal bus. The procedure stops after the mismatch of the calculated and the specified voltages at the substation is less than the predefined convergence tolerance. In the proposed method, the distribution component models including overhead lines, underground cables, different connecting type transformers, spot loads, distributed loads, capacitor banks and cogenerator are in consideration. The proposed solution algorithm has been described in details and tested by IEEE benchmark distribution systems with default system data, different system loadings, different power factors and different R/X ratios at different system loadings. Results show that the algorithm is accurate and computationally efficient in comparing with conventional forward/backward sweep method and ladder iteration method.
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Book chapters on the topic "Backward/Forward Sweep"

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Parmar, Priyanka, and Chintan Patel. "Optimal Placement of Capacitor Using Backward/Forward Sweep Method." In Proceedings of the International Conference on Intelligent Systems and Signal Processing. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6977-2_23.

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Jabari, Farkhondeh, Farnaz Sohrabi, Pouya Pourghasem, and Behnam Mohammadi-Ivatloo. "Backward-Forward Sweep Based Power Flow Algorithm in Distribution Systems." In Studies in Systems, Decision and Control. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34050-6_14.

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Sarada Devi, T. S. N. G., and T. V. L. N. Pavan Phani Kumar. "System Modification Process to Reduce Calculation Complexity in Backward Forward Sweep Algorithm." In Proceedings of Fifth International Conference on Computer and Communication Technologies. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-9704-6_10.

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Jabari, Farkhondeh, Somayeh Asadi, and Sahar Seyed-barhagh. "A Novel Forward-Backward Sweep Based Optimal DG Placement Approach in Radial Distribution Systems." In Studies in Systems, Decision and Control. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34050-6_2.

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Kumar, Indubhushan, and Sandeep Gupta. "Impacts of Distributed Generation on Distribution System Based on the Backward and Forward Sweep Method." In Lecture Notes in Electrical Engineering. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5313-4_7.

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Jabari, Farkhondeh, Khezr Sanjani, and Somayeh Asadi. "Optimal Capacitor Placement in Distribution Systems Using a Backward-Forward Sweep Based Load Flow Method." In Studies in Systems, Decision and Control. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34050-6_3.

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"Adapted Forward-Backward Sweep." In Optimal Control Applied to Biological Models. Chapman and Hall/CRC, 2007. http://dx.doi.org/10.1201/9781420011418-24.

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"Forward-Backward Sweep Method." In Optimal Control Applied to Biological Models. Chapman and Hall/CRC, 2007. http://dx.doi.org/10.1201/9781420011418-7.

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Reeve, W. Paul, Christopher B. Rich, and LaJean Purcell Carruth. "Slavery, Priesthood Denial, and Brigham Young versus Orson Pratt." In This Abominable Slavery. Oxford University Press, 2024. http://dx.doi.org/10.1093/oso/9780197765029.003.0010.

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Abstract In 1856, Latter-day Saint leaders made a second application for statehood and debated a proposal to apply as a slave state. Delegates soundly defeated that proposal, but it indicated the strength of the pro-slavery faction in the territory. Latter-day Saint leaders also began to publicly defend the faith’s newly articulated racial priesthood restriction and offered a variety of rationales to justify it. In the end, Latter-day Saint leaders Brigham Young and Orson Pratt represented two competing strands of thought in the antebellum period. Brigham Young looked backward to various unfree labor categories from the early decades of the nineteenth century, and Orson Pratt looked forward to advocate a free labor ideal. In the long sweep of history, Pratt’s vision won out.
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Hovannisian, Richard G. "Bitter-Sweet Memories: The Last Generation of Ottoman Armenians." In Looking Backward, Moving Forward. Routledge, 2017. http://dx.doi.org/10.4324/9780203786994-6.

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Conference papers on the topic "Backward/Forward Sweep"

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Subramanian, Lalitha, and H. B. Gooi. "Stochastic Backward/Forward Sweep Power Flow Analysis for Islanded Microgrids." In 2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia). IEEE, 2018. http://dx.doi.org/10.1109/isgt-asia.2018.8467763.

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Shah, Saumya, Mahyar Zarghami, and Pınar Muyan-Özçelik. "Accelerating Forward-Backward Sweep Power Flow Computation on the GPU." In ICPP Workshops '20: Workshops. ACM, 2020. http://dx.doi.org/10.1145/3409390.3409397.

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Cun, Hua, Tong Yongjie, and Han Fei. "A fuzzy power flow calculation based on forward-backward sweep method." In 2016 Chinese Control and Decision Conference (CCDC). IEEE, 2016. http://dx.doi.org/10.1109/ccdc.2016.7531519.

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FAKIR, Mohamed EL, Abdelaziz BELFQIH, Faissal EL MARIAMI, and Jamal BOUKHEROUAA. "Enhanced Backward/Forward Sweep Load Flow Algorithm for Radial Distribution Systems." In 2024 4th International Conference on Innovative Research in Applied Science, Engineering and Technology (IRASET). IEEE, 2024. http://dx.doi.org/10.1109/iraset60544.2024.10548842.

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Thimmaiah, Shobhavathy M., Ramesha Gurikelu, and Nisha Sherief. "Numerical Analysis to Investigate the Effect of Swept Rotor on the Overall Performance of a Transonic Compressor Stage." In ASME 2014 Gas Turbine India Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gtindia2014-8216.

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This paper presents the steady state numerical analyses carried out to investigate the effect of forward and backward swept rotor on the overall performance and stability margin of single stage transonic axial flow compressor. Initially, the analyses were carried out on a radially stacked rotor/baseline configuration and obtained the overall performance map of the compressor stage. These results were compared with the available experimental data for validation. Further, investigations were carried out on geometrically modified rotor with six configurations having 5, 10 and 15° forward and backward sweep. A commercial 3-Dimensional CFD package, ANSYS FLUENT was used to compute the complex flow field of transonic compressor rotors. The flow field structures were studied with the help of Mach number total pressure contours. The results of modified rotor geometry indicated that the peak adiabatic efficiency and the total pressure ratio for all the tested forward and backward swept rotor configurations are marginally higher than that of the baseline configuration at all speeds. The operating ranges of all the swept rotor configurations are found to be higher than that of the baseline configuration. The operating range is broader at lower operating speeds than at design speed condition. Rotor with 10° forward sweep and 5° backward sweep indicated the noteworthy improvement in the operating range against the baseline configuration. The stability margin of 11.3, 6.6, 5.2 and 3.5% at 60, 80, 90 and 100% of the design speed respectively compared to the baseline configuration obtained from 10° forward sweep. Rotor with 5° backward sweep showed the stability margin of 12, 4, 3.9 and 3% at 60, 80, 90 and 100% of the design speed respectively compared to the baseline configuration.
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Haider, Rabab, Rupamathi Jaddivada, Anuradha M. Annaswamy, and Marija D. Ilic. "Distributed Backward/Forward Sweep Algorithm for Economic Dispatch in Modern Distribution Grids." In 2020 52nd North American Power Symposium (NAPS). IEEE, 2021. http://dx.doi.org/10.1109/naps50074.2021.9449801.

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Fang, Bohang, Changhong Zhao, and Steven H. Low. "Convergence of Backward/Forward Sweep for Power Flow Solution in Radial Networks." In 2023 62nd IEEE Conference on Decision and Control (CDC). IEEE, 2023. http://dx.doi.org/10.1109/cdc49753.2023.10383981.

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Guan, Jian, Ji-ang Han, Jingjun Zhong, and Chenguang Yuan. "Numerical Research of Aerodynamic Sweep on Leading Edge in the Ram-Rotor." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64202.

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In order to diminish the flow loss in the ram-rotor and improve its aerodynamic performance, the effect of forward and backward swept leading edge on flow field and shock pattern in the ram-rotor was investigated using 3-dimensional steady CFD. Ram-rotors with sweeping angles of −60°, −30°, −15°, 0°, 15°, 30°, 60° were modeled, and ram-rotor performance, shock pattern and leakage flow in different swept schemes were the main focuses of attention. The effect of sweeping angle was also discussed in this paper. It has been found that forward sweep makes performance curves move to high mass flow rate zone in the performance map. Meanwhile, strake tip loading decreases, and maximum adiabatic efficiency increases by 0.31% compared to baseline ram-rotor. Contrary to the forward swept scheme, performance curves of backward sweep schemes shift to small mass flow rate zone, and the tip leakage near front part of strake is enhanced. Backward sweep plays a positive role in improving pressure ratio with a maximum increment of 0.46% at peak efficiency point, but causes a high flow loss. As sweeping angle changes, there is an optimum angle value to get a high performance.
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Wang, Weimin, Qihang Li, Jinji Gao, Timothy Dimond, and Paul Allaire. "Forward and Backward Mode Excitation of Flexible Rotor Supported by Tilting Pad Bearings: Numerical and Experimental Investigation." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26275.

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Understanding rotor modal excitations is crucial for high performance centrifugal compressors and other rotating machines. Assuring low vibration levels of such machines at operating conditions before delivery is important both for original equipment manufacturers (OEMs) and end users. In this paper, transient simulations of a full scale test rig rotor subject to sine sweep excitations are performed to investigate the forward and backward rotor whirling response. The applied sine sweep excitations are circular forward, circular backward, and elliptical forward, respectively. The effects of excitation force amplitude are also investigated to determine the minimum force required to accurately identify the rotor system modal parameters. The transient simulation results are then used to investigate a forward and backward mode system identification method for rotating machinery stability based on sine-sweep excitations. Both simulations and experimental testing on a full size rotor with an electromagnetic actuator were performed to verify and validate the method. The traditional Multiple Input Multiple Output (MIMO) Frequency Response Function (FRF) is transformed into a directional Frequency Response Function (dFRF) form. This transformation recasts the real number field into complex number field via a transformation matrix. This transformation separates the MIMO FRFs into forward and backward components, which improves the accuracy of the identified results. This method is used to identify the first forward bending modal parameters to estimate rotor stability. The rational polynomial method is used to fit and identify both the dFRFs. Excellent correlation was obtained between simulation results and the identification experiments. The results of this paper provide new insights for avoidance of rotor instability in centrifugal compressors.
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Roy, Deblina, Ujjal Sur, and Gautam Sarkar. "Hybrid AC-DC Microgrid Load Flow Based on Modified Backward Forward Sweep Method." In 2019 IEEE Region 10 Symposium (TENSYMP). IEEE, 2019. http://dx.doi.org/10.1109/tensymp46218.2019.8971024.

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