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Relevant bibliographies by topics / Load and flow time

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Academic literature on the topic 'Load and flow time'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "Load and flow time"

1

Samet, Haidar, and Morteza Khorshidsavar. "Analytic time series load flow." Renewable and Sustainable Energy Reviews 82 (February 2018): 3886–99. http://dx.doi.org/10.1016/j.rser.2017.10.084.

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Mesa, Fernando, Pedro Pablo Cardenas Alzate, and Carlos Alberto Rodriguez Varela. "Probabilistic load flow with load estimation using time series techniques and neural networks." Contemporary Engineering Sciences 10 (2017): 1153–61. http://dx.doi.org/10.12988/ces.2017.710132.

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Ghatak, Ujjwal, V. Mukherjee, Almoataz Y. Abdelaziz, Shady H. E. Abdel Aleem, and Hala M. Abdel Mageed. "Time-Efficient Load Flow Technique for Radial Distribution Systems with Voltage-Dependent Loads." International Journal on Energy Conversion (IRECON) 6, no. 6 (November 30, 2018): 196. http://dx.doi.org/10.15866/irecon.v6i6.15765.

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Choudhury, Anamitra Roy, Syamantak Das, Naveen Garg, and Amit Kumar. "Rejecting jobs to minimize load and maximum flow-time." Journal of Computer and System Sciences 91 (February 2018): 42–68. http://dx.doi.org/10.1016/j.jcss.2017.07.006.

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et al., Deepu. "Convergence time aware switch migration algorithm for SDN (CTSMA) cloud datacenter." International Journal of ADVANCED AND APPLIED SCIENCES 9, no. 8 (August 2022): 100–108. http://dx.doi.org/10.21833/ijaas.2022.08.013.

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Multi-controller deployment in a software-defined network improves the system's stability and scalability. However, since network traffic fluctuates, it presents a new problem for balancing loads on remote controllers. Controller Adaption and Migration Decision (CAMD) and Dynamic and Adaptive Load Balancing (DALB) frameworks are developed for efficient balancing of load on the controller to solve the problem of controller overload due to dynamic network traffic. CAMD was considered to be more efficient than DALB, but when the network is more dynamic, and the incoming traffic flow is elephant flow this leads to the overall reduction in system performance. This study proposed a Convergence Time aware Switch Migration Algorithm (CTSMA) that solved the network challenge when the network is more dynamic and incoming traffic flow is more. This research developed an enhanced switch migration algorithm to address the network difficulty of dynamically changing incoming load. Because of the imbalanced distribution of load on the controllers, processing flows will have longer response times and the controllers' throughput will be reduced. Switch migration is the best method of resolving the issue. Present techniques, on the other hand, focus solely on load balancing performance while ignoring migration efficiency, thereby leading to large migration costs and excessive control overheads. To increase the load and migration efficiency of controllers, this research work developed a convergence time aware switch migration method. To find the group of underloaded controllers in the network, the improved framework looked at controller volatility and average load status. Performance comparison indicators included controller throughput, reaction time, and convergence time. According to simulation studies, CTSMA outperforms CAMD by cutting controller reaction time by roughly 6.1%, increasing controller throughput by 8.0% on average, keeping a decent load balancing rate, lowering migration costs, and maintaining the best load balancing rate.

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Moreno Lopez de Saa, M. A., and J. Usaola Garcia. "Three-phase harmonic load flow in frequency and time domains." IEE Proceedings - Electric Power Applications 150, no. 3 (2003): 295. http://dx.doi.org/10.1049/ip-epa:20030250.

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Liu, Chun Rong, and Dao Lin Xu. "Bed Load Transport under Complex Flow." Advanced Materials Research 255-260 (May 2011): 3589–93. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.3589.

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In this paper, the backward-facing step flow and the sediment transport downstream step were studied experimentally. The critical incipient bed shear velocity is obtained by the results of bed shear velocity and sediment incipient probability. It was found that the critical incipient bed shear velocity depends on the flow structures under the complex flow. By using the new critical incipient bed shear obtained in this paper and calculating the Shields parameter based on instantaneous bed shear velocity, the bed load sediment transport rate downstream step was given. The time history of the bed profile downstream step was calculated by bed load sediment transport rate and compared that obtained by the digital images. Good agreement was observed.

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Venkatasivanagaraju, S., and M. Venkateswara Rao. "Polar Coordinates based N-R Method for Load Modelling in Electrical Power Distribution Systems." WSEAS TRANSACTIONS ON POWER SYSTEMS 16 (December 31, 2021): 354–60. http://dx.doi.org/10.37394/232016.2021.16.35.

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In this paper, load modelling has been done in electrical distribution system using local real time test data. This distribution system supplies base loads, residential, industrial, commercial and composite loads. Using power and current-mismatch functions in polar form, a comprehensive framework for applying the Newton–Raphson method to solve power flow problems is presented. The Newton–Raphson approach for solving power flow problems can be applied in six different ways using these two mismatch functions. For load (PQ)buses and generator (PV) buses, we propose a theoretical framework for analyzing these versions. In addition, we compare newly created versions of the Newton power flow method to current variants in this study. Numerical studies on distribution networks are used to study the convergence behavior of all approaches. The measurements are formed for short term load forecasting with different types of realistic loads such as base loads, residential, industrial, commercial and composite loads. The long-term load forecasting and their losses also has been performed along with short term load forecasting. The results are obtained and validated through MATLAB.

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Kubba, Hassan Abdullah, and Yasser Falah Hassan. "A Real-Time Fuzzy Load Flow and Contingency Analysis Based on Gaussian Distribution System." Journal of Engineering 21, no. 8 (August 1, 2015): 55–70. http://dx.doi.org/10.31026/j.eng.2015.08.04.

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Fuzzy logic is used to solve the load flow and contingency analysis problems, so decreasing computing time and its the best selection instead of the traditional methods. The proposed method is very accurate with outstanding computation time, which made the fuzzy load flow (FLF) suitable for real time application for small- as well as large-scale power systems. In addition that, the FLF efficiently able to solve load flow problem of ill-conditioned power systems and contingency analysis. The FLF method using Gaussian membership function requires less number of iterations and less computing time than that required in the FLF method using triangular membership function. Using sparsity technique for the input Ybus sparse matrix data gives reduction in overall computation time and storage requirements. The performance of the used methods had been tested on two typical test systems being the IEEE 14-bus and 30-bus systems in addition to the 362-bus Iraqi National Grid. All the obtained results under normal operating conditions show that the computation time of the fuzzy Load Flow (FLF) is less than the fast decoupled load flow (FDLF).

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Godbole, Prachi, and Sincy George. "A Novel Algorithm for Optimal Harmonic Load Flow including Harmonic Compensation." Engineering, Technology & Applied Science Research 13, no. 1 (February 5, 2023): 10093–99. http://dx.doi.org/10.48084/etasr.5475.

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Load flow analysis is widely used for finding voltage at various parts of a large, interconnected power system. The exponential increase in the use of power electronic devices and the noticeable percentage of integration of renewable energy sources in modern power systems result in the occurrence of non-sinusoidal voltages at various parts of the power system. By reformation of the Newton-Raphson load flow method, a few harmonic load flow algorithms have been developed for modern transmission systems. However, for larger transmission systems, complexity and heavy computational burden are often encountered in the load flow solution process due to the increased size of the Jacobean matrix that further increases with multiple non-linear load buses and compensation requirements. This leads to convergence problems and increased execution time. In this paper, an optimal harmonic load flow algorithm is proposed, that employs a modified PSO technique to select control variables and the harmonic load flow method to find solutions for load flow analysis with a reduced size of the Jacobean matrix. The formulated method uses a simple technique to take into account nonlinear loads and results in faster convergence. The novelty of the algorithm is that an optimal load flow solution with the desired amount of reactive and harmonic compensation currents is obtained. The algorithm can help in getting load flow solutions in future power systems with distorted voltage and currents with compensation. The performance of the proposed algorithm is tested on a modified IEEE 30-bus system with multiple non-linear load buses and is validated with the Simulink model of the system.

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Dissertations / Theses on the topic "Load and flow time"

1

Gillam, David A. "Airloads on a finite wing in a time dependent incompressible freestream." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/12371.

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Joubert, Adriaan Wolfgang. "Parallel methods for systems of nonlinear equations applied to load flow analysis." Thesis, Queen Mary, University of London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362721.

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Macqueen, Christopher Neil. "Time based load-flow analysis and loss costing in electrical distribution systems." Thesis, Durham University, 1994. http://etheses.dur.ac.uk/1700/.

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Ansari, Meisam. "REAL-TIME CONGESTION MANAGEMENT IN MODERN DISTRIBUTION SYSTEMS." OpenSIUC, 2021. https://opensiuc.lib.siu.edu/dissertations/1904.

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In this research, the problem of real-time congestion management in a modern distribution system with massive active elements such as electric vehicles (EVs), distributed energy resources (DERs), and demand response (DR) is investigated. A novel hierarchical operation and management framework is proposed that can take advantage of the demand side contribution to manage the real-time congestion. There are five main steps in this framework as 1) the aggregators send their demand to the microgrid operators (MGOs), 2) the MGOs send their demand to the distribution system operator (DSO), 3) the DSO detects the congestions and calls the engaged MGOs to reduce their demand, 4) the MGOs update the electricity price to motivate the aggregators to reduce the overall demand, and 5) the DSO dispatches the system according to the finalized demand. The proposed framework is validated on two modified IEEE unbalanced test systems. The results illustrate two congestion cases at t=8:45 am and t=9:30 am in the modified IEEE 13-bus test system, which needs 363kW and 286 kW load reductions, respectively, to be fully addressed. MG#1 and MG#2 are engaged to maintain the 363 kW reduction at t=8:45, and MG#3 and MG#4 are called to reduce their demands by 386 kW at t=9:30 am. The overall interactions can relieve the congested branches. The DSO’s calculations show three congestions at t=1 pm, t=3 pm, and t=9 pm on the IEEE 123-bus test system. These congestion cases can be alleviated by reducing 809 kW, 1177 kW, and 497 kW from the corresponding MGs at t=1 pm, t=3 pm, and t=9 pm, respectively. The second part of the simulation results demonstrates that the proposed real-time data estimator (RDE) can reduce the DSO’s miss-detected congestion cases due to the uncertain data. There are two miss-detected congestions in the IEEE 13-bus test system at t=1:15 pm and t=1:30 pm that can be filtered for t=1:15 pm and minored for t=1:30 pm using the RDE. The proposed RDE can also reduce the miss-detected congestions from 18 cases to four cases in the IEEE 123-bus test system. As a result, the RDE can minimize the extra costs due to the uncertain data. The overall results validate that the proposed framework can adaptively manage real-time congestions in distribution systems.

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Urquhart, Andrew J. "Accuracy of low voltage electricity distribution network modelling." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/21799.

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The connection of high penetrations of new low carbon technologies such as PV and electric vehicles onto the distribution network is expected to cause power quality problems and the thermal capacity of feeder cables may be exceeded. Replacement of existing infrastructure is costly and so feeder cables are likely to be operated close to their hosting capacity. Network operators therefore require accurate simulation models so that new connection requests are not unnecessarily constrained. This work has reviewed recent studies and found a wide range of assumptions and approximations that are used in network models. A number of these have been investigated further, focussing on methods to specify the impedances of the cable, the impacts of harmonics, the time resolution used to model demand and generation, and assumptions regarding the connectivity of the neutral and ground conductors. The calculation of cable impedances is key to the accuracy of network models but only limited data is available from design standards or manufacturers. Several techniques have been compared in this work to provide guidance on the level of detail that should be included in the impedance model. Network modelling results with accurate impedances are shown to differ from those using published data. The demand data time resolution has been shown to affect estimates of copper losses in network cables. Using analytical methods and simulations, the relationship between errors in the loss estimates and the time resolution has been demonstrated and a method proposed such that the accuracy of loss estimates can be improved. For networks with grounded neutral conductors, accurate modelling requires the resistance of grounding electrodes to be taken into account. Existing methods either make approximations to the equivalent circuit or suffer from convergence problems. A new method has been proposed which resolves these difficulties and allows realistic scenarios with both grounded and ungrounded nodes to be modelled. In addition to the development of models, the voltages and currents in a section of LV feeder cable have been measured. The results provide a validation of the impedance calculations and also highlight practical difficulties associated with comparing simulation models with real measurement results.

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Widén, Joakim. "System Studies and Simulations of Distributed Photovoltaics in Sweden." Doctoral thesis, Uppsala universitet, Fasta tillståndets fysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-132907.

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Grid-connected photovoltaic (PV) capacity is increasing worldwide, mainly due to extensive subsidy schemes for renewable electricity generation. A majority of newly installed systems are distributed small-scale systems located in distribution grids, often at residential customers. Recent developments suggest that such distributed PV generation (PV-DG) could gain more interest in Sweden in the near future. With prospects of decreasing system prices, an extensive integration does not seem impossible. In this PhD thesis the opportunities for utilisation of on-site PV generation and the consequences of a widespread introduction are studied. The specific aims are to improve modelling of residential electricity demand to provide a basis for simulations, to study load matching and grid interaction of on-site PV and to add to the understanding of power system impacts. Time-use data (TUD) provided a realistic basis for residential load modelling. Both a deterministic and a stochastic approach for generating different types of end-use profiles were developed. The models are capable of realistically reproducing important electric load properties such as diurnal and seasonal variations, short time-scale fluctuations and random load coincidence. The load matching capability of residential on-site PV was found to be low by default but possible to improve to some extent by different measures. Net metering reduces the economic effects of the mismatch and has a decisive impact on the production value and on the system sizes that are reasonable to install for a small-scale producer. Impacts of large-scale PV-DG on low-voltage (LV) grids and on the national power system were studied. Power flow studies showed that voltage rise in LV grids is not a limiting factor for integration of PV-DG. Variability and correlations with large-scale wind power were determined using a scenario for large-scale building-mounted PV. Profound impacts on the power system were found only for the most extreme scenarios.
Felaktigt tryckt som Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 711

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7

Goyal, Sachin. "Power network in the loop : subsystem testing using a switching amplifier." Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/26521/1/Sachin_Goyal_Thesis.pdf.

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“Hardware in the Loop” (HIL) testing is widely used in the automotive industry. The sophisticated electronic control units used for vehicle control are usually tested and evaluated using HIL-simulations. The HIL increases the degree of realistic testing of any system. Moreover, it helps in designing the structure and control of the system under test so that it works effectively in the situations that will be encountered in the system. Due to the size and the complexity of interaction within a power network, most research is based on pure simulation. To validate the performance of physical generator or protection system, most testing is constrained to very simple power network. This research, however, examines a method to test power system hardware within a complex virtual environment using the concept of the HIL. The HIL testing for electronic control units and power systems protection device can be easily performed at signal level. But performance of power systems equipments, such as distributed generation systems can not be evaluated at signal level using HIL testing. The HIL testing for power systems equipments is termed here as ‘Power Network in the Loop’ (PNIL). PNIL testing can only be performed at power level and requires a power amplifier that can amplify the simulation signal to the power level. A power network is divided in two parts. One part represents the Power Network Under Test (PNUT) and the other part represents the rest of the complex network. The complex network is simulated in real time simulator (RTS) while the PNUT is connected to the Voltage Source Converter (VSC) based power amplifier. Two way interaction between the simulator and amplifier is performed using analog to digital (A/D) and digital to analog (D/A) converters. The power amplifier amplifies the current or voltage signal of simulator to the power level and establishes the power level interaction between RTS and PNUT. In the first part of this thesis, design and control of a VSC based power amplifier that can amplify a broadband voltage signal is presented. A new Hybrid Discontinuous Control method is proposed for the amplifier. This amplifier can be used for several power systems applications. In the first part of the thesis, use of this amplifier in DSTATCOM and UPS applications are presented. In the later part of this thesis the solution of network in the loop testing with the help of this amplifier is reported. The experimental setup for PNIL testing is built in the laboratory of Queensland University of Technology and the feasibility of PNIL testing has been evaluated using the experimental studies. In the last section of this thesis a universal load with power regenerative capability is designed. This universal load is used to test the DG system using PNIL concepts. This thesis is composed of published/submitted papers that form the chapters in this dissertation. Each paper has been published or submitted during the period of candidature. Chapter 1 integrates all the papers to provide a coherent view of wide bandwidth switching amplifier and its used in different power systems applications specially for the solution of power systems testing using PNIL.

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8

Goyal, Sachin. "Power network in the loop : subsystem testing using a switching amplifier." Queensland University of Technology, 2009. http://eprints.qut.edu.au/26521/.

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“Hardware in the Loop” (HIL) testing is widely used in the automotive industry. The sophisticated electronic control units used for vehicle control are usually tested and evaluated using HIL-simulations. The HIL increases the degree of realistic testing of any system. Moreover, it helps in designing the structure and control of the system under test so that it works effectively in the situations that will be encountered in the system. Due to the size and the complexity of interaction within a power network, most research is based on pure simulation. To validate the performance of physical generator or protection system, most testing is constrained to very simple power network. This research, however, examines a method to test power system hardware within a complex virtual environment using the concept of the HIL. The HIL testing for electronic control units and power systems protection device can be easily performed at signal level. But performance of power systems equipments, such as distributed generation systems can not be evaluated at signal level using HIL testing. The HIL testing for power systems equipments is termed here as ‘Power Network in the Loop’ (PNIL). PNIL testing can only be performed at power level and requires a power amplifier that can amplify the simulation signal to the power level. A power network is divided in two parts. One part represents the Power Network Under Test (PNUT) and the other part represents the rest of the complex network. The complex network is simulated in real time simulator (RTS) while the PNUT is connected to the Voltage Source Converter (VSC) based power amplifier. Two way interaction between the simulator and amplifier is performed using analog to digital (A/D) and digital to analog (D/A) converters. The power amplifier amplifies the current or voltage signal of simulator to the power level and establishes the power level interaction between RTS and PNUT. In the first part of this thesis, design and control of a VSC based power amplifier that can amplify a broadband voltage signal is presented. A new Hybrid Discontinuous Control method is proposed for the amplifier. This amplifier can be used for several power systems applications. In the first part of the thesis, use of this amplifier in DSTATCOM and UPS applications are presented. In the later part of this thesis the solution of network in the loop testing with the help of this amplifier is reported. The experimental setup for PNIL testing is built in the laboratory of Queensland University of Technology and the feasibility of PNIL testing has been evaluated using the experimental studies. In the last section of this thesis a universal load with power regenerative capability is designed. This universal load is used to test the DG system using PNIL concepts. This thesis is composed of published/submitted papers that form the chapters in this dissertation. Each paper has been published or submitted during the period of candidature. Chapter 1 integrates all the papers to provide a coherent view of wide bandwidth switching amplifier and its used in different power systems applications specially for the solution of power systems testing using PNIL.

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9

Saeidpour, Parizy Ehsan. "Electrical Energy Retail Price Optimization for an Interconnected/Islanded Power Grid." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1512463830323059.

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Ciereszko, Tomasz. "Advanced probabilistic load flow." Master's thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/10204.

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Mestrado em Engenharia Electrónica e Telecomunicações
This thesis sets forth a computational framework of probabilistic load flow analysis taking into consideration of high penetration of variable energy resources, such as the wind generation. The framework enables a faster and more precise estimation of the impact of variable energy resources in load flow analysis. This thesis consists of six chapters: introduction, probabilistic load flow algorithms, computer program for PLF calculations, conclusion and future work, appendices and reference. The second part contains the mathematical development of the framework based on Sequence Operation Theory newly established. The formulation is novel in that it provides an improved computational alternative to the existing simulation based frameworks. The third part contains information about program written in Fortran 90/95 environment like format of reading data etc. Include the studies based on the standard IEEE 9-bus system. Data obtained as a result of program’s work in debugging process are compared with manual calculations for the same network to check if the program is working in proper way. Moreover comprise the results obtained in the program for largest tested network 96-RTS (24 buses). Appendices include content of two input files (random generation, system configuration for 96-RTS) and intermediate result calculated for the 24-bus system.
Esta dissertação descreve parte do desenvolvimento de uma aplicação de software para calcular o fluxo de potência em sistemas de redes elétricas usando métodos probabilísticos, considerando o caso da existência de geradores com produção fortemente variável, como acontece nas quintas eólicas. A dissertação está dividida em seis capítulos: introdução, algoritmos de fluxo de potência probabilísticos, desenvolvimento do código, conclusão, apêndices e referências. A segunda parte é constituída pelo desenvolvimento matemático do método utilizado, que foi recentemente criado apresentando uma alternativa mais eficiente às tradicionais. A Terceira parte contem informação sobre a o programa criado para implementar o algoritmo e seu teste, nomeadamente o desempenho na análise do standard IEEE 96-RTS (24 - bus system). Os apêndices incluem o conteúdo dos ficheiros de entrada e resultados intermédios para debug da solução apresentada.
Praca przedstawia probabilistyczną metodę do obliczania przepływów mocy w sieci energetycznej z szczególnym uwzględnieniem zmiennych źródeł energii takich jak generacja wiatrowa. Prezentowane podejście umożliwia szybsze i bardziej precyzyjne oszacowanie zmiennych zasobów energetycznych w analizie rozpływów mocy. Dokument został podzielony na sześć następujących części: wstęp, algorytm probabilistic load flow, program komputerowy, podsumowanie i możliwośći rowoju projektu, dodatki, bibliografia. Druga część pracy zawiera założenia metody Sequence Operation Theory (SOT). Prezentowany algorytm jest nowy i stanowi alternatywę dla dotychczasowo stosowanych metod. Część trzecia opisuje program komputerowy z zaimplementowaną metodą SOT stworzony na potrzeby tej pracy. Kod programu został napisany w środowisku Fortran 90/95. Rozdział zawiera badania oparte na systemie sieci energetycznej 9 magistral w celu sprawdzenia poprawności działania kodu. Ponadto w tej części zostały zaprezentowane wyniki działania aplikacji dla systemu testowego 96-RTS (24 magistral). W dodatkach zaprezentowano zawartość dwóch plików wejściowych: konfigurację systemu testowego 96-RTS i wartości generacji dla zmiennego źródła oraz pośrednie wyniki obliczeniowe dla tego systemu.

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Books on the topic "Load and flow time"

1

Hariharan, M. V., S. D. Varwandkar, and Pragati P. Gupta. Modular Load Flow for Restructured Power Systems. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0497-1.

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United States. National Aeronautics and Space Administration., ed. Arcjet load characteristics. [Washington, D.C.]: NASA, 1990.

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Andrew, Kelley, Margasahayam Ravi N, and United States. National Aeronautics and Space Administration., eds. Space shuttle hypergold load determination using nonintrusive ultrasonic flowmeters. Kennedy Space Center, Fla: National Aeronautics and Space Administration, John F. Kennedy Space Center, 1996.

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Power system analysis: Short-circuit load flow and harmonics. 2nd 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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Gitau, Kimani, ed. The flow of time. [Gatundu, Kenya]: Creative Initiative, 2012.

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Antoni, Mazurkiewicz, MONDILEX, and Instytut Slawistyki (Polska Akademia Nauk), eds. Time flow and tenses. Warsaw: Slawistyczny Ośrodek Wydawniczy, 2010.

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Bjarke, Lisa J. A summary of the forebody high-angle-of-attack aerodynamics research on the F-18 and the X-29A aircraft. Edwards, Calif: National Aeronautics and Space Administration, Ames Research Center, Dryden Flight Research Facility, 1992.

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Bjarke, Lisa J. A summary of the forebody high-angle-of-attack aerodynamics research on the F-18 and the X-29A aircraft. Edwards, Calif: National Aeronautics and Space Administration, Ames Research Center, Dryden Flight Research Facility, 1992.

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Association of Edison Illuminating Companies. Load Research Committee. Load research manual. 2nd ed. Birmingham, Ala: Load Research Committee, Association of Edison Illuminating Companies, 2001.

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Book chapters on the topic "Load and flow time"

1

Henze, Janosch, Tanja Kneiske, Martin Braun, and Bernhard Sick. "Identifying Representative Load Time Series for Load Flow Calculations." In Data Analytics for Renewable Energy Integration: Informing the Generation and Distribution of Renewable Energy, 83–93. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-71643-5_8.

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Tanchoco, J. M. A., and C. G. Co. "Real-time control strategies for multiple-load AGVs." In Material Flow Systems in Manufacturing, 300–331. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2498-4_11.

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Henze, Janosch, Stephan Kutzner, and Bernhard Sick. "Sampling Strategies for Representative Time Series in Load Flow Calculations." In Data Analytics for Renewable Energy Integration. Technologies, Systems and Society, 27–48. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-04303-2_3.

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Li, Jianqing, Hongli Li, Jing Li, Jianmin Chen, Kai Liu, Zheng Chen, and Li Liu. "Distributed Heterogeneous Parallel Computing Framework Based on Component Flow." In Proceeding of 2021 International Conference on Wireless Communications, Networking and Applications, 437–45. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2456-9_45.

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AbstractSingle processor has limited computing performance, slow running speed and low efficiency, which is far from being able to complete complex computing tasks, while distributed computing can solve such huge computational problems well. Therefore, this paper carried out a series of research on the heterogeneous computing cluster based on CPU+GPU, including component flow model, multi-core multi processor efficient task scheduling strategy and real-time heterogeneous computing framework, and realized a distributed heterogeneous parallel computing framework based on component flow. The results show that the CPU+GPU heterogeneous parallel computing framework based on component flow can make full use of the computing resources, realize task parallel and load balance automatically through multiple instances of components, and has the characteristics of good portability and reusability.

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Ekhlakov, Roman. "Modern Methods of Traffic Flow Modeling: A Graph Load Calculation Model Based on Real-Time Data." In Intelligent Decision Technologies, 302–9. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2969-6_27.

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Daub, Dennis, Sebastian Willems, Burkard Esser, and Ali Gülhan. "Experiments on Aerothermal Supersonic Fluid-Structure Interaction." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 323–39. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_21.

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Abstract Mastering aerothermal fluid-structure interaction (FSI) is crucial for the efficient and reliable design of future (reusable) launch vehicles. However, capabilities in this area are still quite limited. To address this issue, a multidisciplinary experimental and numerical study of such problems was conducted within SFB TRR 40. Our work during the last funding period was focused on studying the effects of moderate and high thermal loads. This paper provides an overview of our experiments on FSI including structural dynamics and thermal effects for configurations in two different flow regimes. The first setup was designed to study the combined effects of thermal and pressure loads. We investigated a range of conditions including shock-wave/boundary-layer interaction (SWBLI) with various incident shock angles leading to, in some cases, large flow separation with high amplitude temperature dependent panel oscillations. The respective aerothermal loads were studied in detail using a rigid reference panel. The second setup allowed us to study the effects of severe heating leading to plastic deformation of the structure. We obtained severe localized heating resulting in partly plastic deformations of more than 12 times the panel thickness. Furthermore, the effects of repeated load cycles were studied.

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Arrillaga, J., and N. R. Watson. "Load Flow." In Computer Modelling of Electrical Power Systems, 81–128. West Sussex, England: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118878286.ch4.

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Arrillaga, J., and C. P. Arnold. "Load Flow." In 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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Stillig, Javier, Carolin Brenner, and André Colomb. "Adaptive Intralogistics with Low-Cost AGVs for a Modular Production System." In Advances in Automotive Production Technology – Towards Software-Defined Manufacturing and Resilient Supply Chains, 118–32. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27933-1_12.

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AbstractDue to ever faster changing market requirements, industrial production equipment needs to become much more flexible. For this reason, the Institute of Mechanical Handling and Logistics and the Institute of Electrical Energy Conversion are developing versatile, automated, and easily adaptable solutions to increase the flexibility of future intralogistics systems. As part of the ANTS 4.0 research project, a modular low-cost automated guided vehicle has been created, which breaks down the flow of goods into its smallest units: A small load carrier. The vehicle is prepared to be charged inductively and guided by color coded LED strips inside the floor, controlled from a superordinated artificial intelligence algorithm. In case of finding an obstacle by the object detection integrated in the floor, the route is recalculated and adapted in real-time.

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Loosen, Simon, Matthias Meinke, and Wolfgang Schröder. "Numerical Analysis of the Turbulent Wake for a Generic Space Launcher with a Dual-Bell Nozzle." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 163–77. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_10.

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Abstract The turbulent wake of an axisymmetric generic space launcher equipped with a dual-bell nozzle is simulated at transonic ($$Ma_\infty = 0.8$$ and $$Re_D = 4.3\cdot 10^5$$) and supersonic ($$Ma_\infty = 3$$ and $$Re_D = 1.2\cdot 10^6$$) freestream conditions, to investigate the influence of the dual-bell nozzle jet onto the wake flow and vice versa. In addition, flow control by means of four in circumferential direction equally distributed jets injecting air encountering the backflow in the recirculation region is utilized to determine if the coherence of the wake and consequently, the buffet loads can be reduced by flow control. The simulations are performed using a zonal RANS/LES approach. The time-resolved flow field data are analyzed by classical spectral analysis, two-point correlation analysis, and dynamic mode decomposition (DMD). At supersonic freestream conditions, the nozzle counter pressure is reduced by the expansion of the outer flow around the nozzle lip leading to a decreased transition nozzle pressure ratio. In the transonic configuration a spatio-temporal mode with an eigenvalue matching the characteristic buffet frequency of $$Sr_D=0.2$$ is extracted by the spectral and DMD analysis. The spatial shape of the detected mode describes an antisymmetric wave-like undulating motion of the shear layer inducing the low frequency dynamic buffet loads. By flow control this antisymmetric coherent motion is weakened leading to a reduction of the buffet loads on the nozzle fairing.

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Conference papers on the topic "Load and flow time"

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Varwandkar, S. D., Pragati P. Gupta, and M. V. Hariharan. "Load flow with time varying injections." In 2016 19th National Power Systems Conference (NPSC). IEEE, 2016. http://dx.doi.org/10.1109/npsc.2016.7858884.

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Choudhury, Anamitra Roy, Syamantak Das, Naveen Garg, and Amit Kumar. "Rejecting jobs to Minimize Load and Maximum Flow-time." In Proceedings of the Twenty-Sixth Annual ACM-SIAM Symposium on Discrete Algorithms. Philadelphia, PA: Society for Industrial and Applied Mathematics, 2014. http://dx.doi.org/10.1137/1.9781611973730.75.

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Fengxian Miao and Zhizhong Guo. "A method of real-time load flow without benchmark bus." In TENCON 2008 - 2008 IEEE Region 10 Conference (TENCON). IEEE, 2008. http://dx.doi.org/10.1109/tencon.2008.4766764.

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Martinez, Juan A., and Jacinto Martin-Arnedo. "Distribution load flow calculations using time driven and probabilistic approaches." In 2011 IEEE Power & Energy Society General Meeting. IEEE, 2011. http://dx.doi.org/10.1109/pes.2011.6039171.

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Deboever, Jeremiah, Miguel Hernandez, Jouni Peppanen, Piyapath Siratarnsophon, and Matthew J. Reno. "Impact of AMI Data Time Granularity on Quasi-Static Time-Series Load Flow Simulation." In 2020 IEEE/PES Transmission and Distribution Conference and Exposition (T&D). IEEE, 2020. http://dx.doi.org/10.1109/td39804.2020.9300001.

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Muruganantham, B., R. Gnanadass, and N. P. Padhy. "Location and time domain analysis of DER in distribution load flow." In 2017 IEEE Power & Energy Society General Meeting (PESGM). IEEE, 2017. http://dx.doi.org/10.1109/pesgm.2017.8273901.

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Sharma, Veena, R. Naresh, and Vineet Kumar. "Load Flow unit Commitment Real Time Problem using Modern Optimization Tool." In 2021 Emerging Trends in Industry 4.0 (ETI 4.0). IEEE, 2021. http://dx.doi.org/10.1109/eti4.051663.2021.9619210.

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Mulvaney-Kemp, Julie, Salar Fattahi, and Javad Lavaei. "Load Variation Enables Escaping Poor Solutions of Time-Varying Optimal Power Flow." In 2020 IEEE Power & Energy Society General Meeting (PESGM). IEEE, 2020. http://dx.doi.org/10.1109/pesgm41954.2020.9281807.

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Zhao, Jinquan, and Yi Wang. "A new continuation power flow model for simulating time-domain dynamic load restoration." In Energy Society General Meeting (PES). IEEE, 2009. http://dx.doi.org/10.1109/pes.2009.5275456.

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Wu, Jie, Decao Yin, Jingzhe Jin, Halvor Lie, Elizabeth Passano, Svein Sævik, Guttorm Grytøyr, et al. "Time Domain Prediction of VIV Responses in Oscillatory Flow Conditions." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-79191.

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Abstract Vortex induced vibrations (VIV) may be developed in the sag-bend area of steel catenary risers (SCRs) and lazy wave risers (SLWRs) induced by the top motions. There is lack of reliable tools to predict VIV responses in such oscillatory flow conditions in the riser design. A time-domain VIV load model has been implemented in software VIVANA-TD. This load model adds a vortex shedding force term with a synchronization model to the conventional Morison load formulation. The synchronization model introduces a phase-coupling between the force and response, which effectively captures how the local vortex shedding frequency may increase or decrease to obtain lock-in. This time domain VIV load model makes it possible to account for time-varying flow speed. In the present study, the vortex shedding process and response characteristics of VIV in oscillatory flow conditions have been reviewed. The capability and limitations of the existing time domain VIV load model have been investigated. The empirical parameters have been derived from model test data. The validation study using the Equinor SCR and Deepstar SLWR test data shows that the predicted maximum fatigue damage is within a factor of 5 compared to the measurement for 85% of the cases. This demonstrates that the present VIVANA-TD can describe the main characteristic of VIV responses in the oscillatory flow conditions.

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Reports on the topic "Load and flow time"

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Thomas, Douglas S. Flow time innovations:. Gaithersburg, MD: National Institute of Standards and Technology, August 2019. http://dx.doi.org/10.6028/nist.ams.100-25.

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Zimmerman, Nicole. Time-Variant Load Models of Electric Vehicle Chargers. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.2294.

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

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Gamba-Santamaria, Santiago, Luis Fernando Melo-Velandia, and Camilo Orozco-Vanegas. What can credit vintages tell us about non-performing loans? Banco de la República de Colombia, February 2021. http://dx.doi.org/10.32468/be.1154.

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Using Colombian credit vintage data, we decompose the non-performing loans into one component that captures the evolution of the payment capacity of borrowers, and other component that captures changes in the credit risk taken by the financial system at the time of loan disbursement. We use intrinsic estimators and penalized regression techniques to overcome the perfect multicollinearity problem that the model entails. We find that these two type of components have evolved differently over time, and that good economic conditions and loose financial conditions improve the payment capacity of borrowers to meet their obligations, and in turn, they tend to coincide with the financial system engaging in riskier loans. Finally, we advocate the use of this methodology as a policy tool that is easy to apply by financial and economic authorities that dispose of a constant flow of credit vintage information. Through it, they will be able to identify the origin of the credit risk materialization and curb the risk taken by the financial system.

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Portante, E. C., J. A. Kavicky, J. C. VanKuiken, and J. P. Peerenboom. Load flow analysis: Base cases, data, diagrams, and results. Office of Scientific and Technical Information (OSTI), October 1997. http://dx.doi.org/10.2172/543639.

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Huayamave, Victor, Eduardo Divo, Andres Ceballos, Carolina Barriento, Barkaszi Stephen, and Seigneur Hubert. Real-time POD-CFD Wind-Load Calculator for PV Systems. Office of Scientific and Technical Information (OSTI), March 2014. http://dx.doi.org/10.2172/1124137.

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Camus, Ted. Calculating time-to-contact using real-time quantized optical flow. Gaithersburg, MD: National Institute of Standards and Technology, 1995. http://dx.doi.org/10.6028/nist.ir.5609.

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Coughlin, Katie, and J. H. Eto. Analysis of Wind Power and Load Data at Multiple Time Scales. Office of Scientific and Technical Information (OSTI), December 2010. http://dx.doi.org/10.2172/1004166.

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Coombs, David, Martin Herman, Tsai Hong, and Marilyn Nashman. Real-time obstacle avoidance using central flow divergence and peripheral flow. Gaithersburg, MD: National Institute of Standards and Technology, 1995. http://dx.doi.org/10.6028/nist.ir.5605.

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Carpenter, B., S. Jiang, and W. Tarreau. Using the IPv6 Flow Label for Load Balancing in Server Farms. RFC Editor, January 2014. http://dx.doi.org/10.17487/rfc7098.

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