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Novel system for dynamic flowsheet simulation of solids processes

POWDER TECHNOLOGY 2017年 314卷 665-679页

作者： Skorych, Vasyl Dosta, Maksym Hartge, Ernst-Ulrich Heinrich, Stefan Hamburg Univ Technol Inst Solids Proc Engn & Particle Technol Denickestr 15 D-21073 Hamburg Germany

The dynamic flowsheet simulation of solids processes is an area of increasing interest in recent years. Compared to the well-established flowsheet modelling of liquid-gas systems, the modelling of granular materials requires different approaches, strategies and algorithms. Therefore the new dynamic flowsheet simulation framework Dyssol has been developed within the Priority Program SPP 1679 "Dynamic simulation of interconnected solids processes (DYNSIM-FP)" of the German Research Foundation (DFG). In this contribution the architecture of the novel simulation framework and computational methods employed in it are presented. The system is based on the sequential-modular approach supplemented with partitioning and tearing methods. Waveform relaxation method, as well as several convergence methods and data extrapolation algorithms have been implemented to improve system performance and to increase convergence rate. To perform a correct calculation of multidimensional distributed parameters an approach with transformation matrices is used in the Dyssol system. Simulation case studies calculated with new system have showngood stability, convergence rate and agreement of simulation results with test systems and experimental results. (C) 2017 Elsevier B.V. All rights reserved.

关键词： Flowsheet simulation framework Dynamic modelling Solids processes distributed parameters Transformation matrix

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Applying Transmission Line Theory to Study the Transmitting Turn-OFF Current in a Long Grounded Wire

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 2017年第10期65卷 5112-5122页

作者： Shi, Zongyang Liu, Lihua Xiao, Pan Geng, Zhi Fang, Guangyou Inst Elect Key Lab Electromagnet Radiat & Sensing Technol Beijing 100190 Peoples R China Univ Acad Sci Beijing Peoples R China

A long grounded wire in the transient electromagnetic (TEM) surveys is usually considered by using the lumped parameter circuit model, which fails to explicate the early turn-OFF current with crucial importance for TEM surveys. In this paper, the transmission line model is introduced for the first time to explicate the early turn-OFF current in the long grounded wire considering the high frequency at early turn-OFF stage. The transmission line model suitable for the long grounded wire is constructed, then the calculation formulas of the distributed parameters and load impedance are analyzed, and the transfer function utilized to simulate the current at any position of the transmission line is also derived. The simulation is performed in the frequency domain with subsequent transformation into the time domain, and the simulation results are in good agreement with the experimental data. The early turn-OFF currents depending on the earth resistivity vary with the position in the long grounded wire. Therefore, the early time TEM response differs from that predicted by the classical theory of the TEM surveys. This proposed model can guide the realization of the minimum current turn-OFF duration, which will help to reduce the detection blind spot and this paper provides new ideas and prospects for early response data and current waveform data for interpretation in the geophysics detection.

关键词： distributed parameters long grounded wire transient electromagnetic (TEM) surveys transmission line model turn-OFF

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High-frequency current distribution in thin-film comb thermal converter

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SENSORS AND ACTUATORS A-PHYSICAL 2005年第2期121卷 352-363页

作者： Kozlov, AG Russian Acad Sci Inst Sensor Microelect Siberian Branch Omsk 644077 Russia

An analytical model that allows one to determine the high-frequency current distribution in a thin-film comb thermal converter is presented. This model takes into account the influence of the shunting effect of a thermopile on the high-frequency current distribution in the thermal converter. The structure of the thermal converter is treated as a distributed-parameter structure. The distributed parameters of the structure are analyzed as applied to a thermal converter in which hot thermojunctions of a thermopile are situated above a heater. A system of equations that relates the high-frequency currents and the voltage in the thermal converter and takes into account the capacitive and inductive couplings between the heater and the thermopile and the periodicity of these couplings and the resistance per unit length of the thermopile is obtained. This system of equations is solved analytically by its transformation to one parameter task. Expressions for the high-frequency currents in the heater and the thermopile are obtained. The present model is used to determine the high-frequency current distribution in the realistic structure of the thin-film comb thermal converter. (c) 2005 Elsevier B.V. All rights reserved.

关键词： distributed parameters high-frequency current shunting effect thermal converter

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Study of a water desalination station using the SMCEC technique: dynamic modelling and simulation

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DESALINATION 2001年第1-3期137卷 53-61页

作者： Ben Bacha, H Damak, T Bouzguenda, M Maalej, AY Ben Dhia, H Ecole Natl Ingn Sfax Lab Syst Electromecan Sfax Tunisia Ecole Natl Ingn Sfax Lab Eau Energie & Environm Dept Engn Mech Sfax Tunisia

The dynamic modelling and simulation of the three sections of a water desalination facility using the Solar Multiple Condensation Evaporation Cycle (SMCEC) technique are presented. The models are obtained using thermal energy and mass balances of the different sections of the unit. The resulting distributed parametric systems of equations are transformed into a system of ordinary differential equations using the orthogonal collocation method. The parametric study in the dynamic mode and the numerical simulation allow to predict the behaviour of output of each of the three unit sections following variations in the internal signals and external perturbations.

关键词： water desalination SMCEC dynamic modelling distributed parameters orthogonal collocation numerical simulation

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Modeling simulation and control of the wood drying process - Part 1. A set of PDE's as an internal model

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DRYING TECHNOLOGY 1998年第6期16卷 1075-1084页

作者： Tarasiewicz, S Leger, F Univ Laval Dept Mech Engn St Foy PQ G1K 7P4 Canada Forintek Canada Corp East Div St Foy PQ G1P 4R4 Canada

The internal model proposed is a nonlinear system of a few partial differential equations. The boundary conditions for the differential equations are specified at the lumber board entrance and between the wood and air. The initial conditions are calibrated by solving the static model and by the technical experiment. In conclusion, it can be said that the consistency of the model with experimental results seems to be reasonably good and can be used for process simulation and control.

关键词： wood drying process distributed parameters operating functions internal model

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Electromagnetic-thermal characterization of on on-chip coupled (a)symmetrical interconnects

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IEEE TRANSACTIONS ON ADVANCED PACKAGING 2007年第4期30卷 851-863页

作者： Yin, Wen-Yan Kang, Kai Mao, Jun-Fa Shanghai Jiao Tong Univ Sch Elect Informat & Elect Engn Ctr Microwave & RF Technologies Shanghai 200240 Peoples R China Natl Univ Singapore Dept Elect & Comp Engn Singapore 119260 Singapore

Based on several extended formulas to determine all frequency- and temperature-dependent distributed parameters of on-chip coupled asymmetrical and symmetrical interconnects on silicon substrates, the electromagnetic-thermal characteristics of interconnects were investigated in detail, including 1) wideband series impedances and shunt conductances, 2) conductive and dielectric attenuation constants of even(c) and odd (pi)-mode, 3) pulse waveform distortion and crosstalk, and 4) average power handling capability (APHC). In these investigations, a set of modified formulas were proposed to determine the mutual conductance and capacitance of asymmetrical configuration. Appropriate thermal models were employed to evaluate the rise in temperature of metal interconnects, where the lateral heat dissipation was taken into account for different spacings between two interconnects. Parametric calculations were performed to capture the hybrid effects of all geometric and physical parameters of metal interconnects, such as line thickness, line conductivity, and silicon conductivity. All numerical examples are believed to be useful in the design of (a)symmetrical interconnects for digital and radio frequency circuits.

关键词： average power handling capability (APHC) conductive and dielectric attenuation constants coupled metal-insulator-silicon interconnects distributed parameters frequency- and temperature-dependent pulse waveform distortion thermal model

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Fault prelocalization of underground single-phase cables: Modeling and simulation

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2013年第1期44卷 514-519页

作者： Aloui, Thameur Ben Amar, Fathi Abdallah, Hsan Hadj Tunisian Co Elect & Gas Sfax 3012 Tunisia Sfax Preparatory Inst Engn Studies Sfax 3018 Tunisia Natl Engn Sch Sfax Sfax 3038 Tunisia

This paper proposes a tool of assistance to prelocate insulation faults affecting electrical single-phase cables by using measurements of voltage and current available in source substation. An equivalent network modeling faults to the ground is analyzed by employing the distributed parameters approach. The per-unit length values of these parameters are calculated according to the geometrical data of the cable. The specificity of this tool is the introduction of a resistance to model sheath-ground insulation what allows studying various types of short-circuits to the ground (frank and resistive). Scenarios of fault are applied to the underground cable 150 kV, connecting high voltage (HTB) sub-stations of Tyna-Taparoura-Sidimansour in Sfax city of Tunisia. A study of validation is approved by the software Simulink-SimPowerSystems of Matlab. (C) 2012 Elsevier Ltd. All rights reserved.

关键词： Underground cable Modeling distributed parameters Insulation fault Prelocalization Fault distance

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One-end fault location method for untransposed four-circuit transmission lines

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2012年第1期43卷 660-669页

作者： Ngu, E. E. Ramar, K. Eisa, Amir Multimedia Univ Malaysia Fac Engn Cyberjaya 63100 Malaysia Sudan Univ Sci & Technol Khartoum Sudan

This paper presents a fault location method suitable for untransposed four-circuit parallel transmission lines using the data available at one end of the line. The proposed method employs an accurate distributed parameter line model that fully accounts for mutual coupling between all the lines and shunt capacitance effects. The fault location algorithms are developed in phase-components, one for the case where the fault is in any one of the circuits, the second for the case where the fault involves any two circuits and the third for the case where the fault involves more than two circuits. The proposed method is tested using the transient data obtained by simulating a 500-kV four-circuit overhead transmission line under different fault conditions. The simulations are done using the software "DIgSILENT PoweFactory". Results obtained indicate that the method is capable of estimating the fault distance with high accuracy for various fault conditions. Also the robustness of the fault location method is investigated. (C) 2012 Elsevier Ltd. All rights reserved.

关键词： distributed parameters Fault location One-end method Four-circuits Transmission line

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An effective fault location technique for transmission grids using phasor measurement units

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2012年第1期42卷 653-660页

作者： Jiang, Zhen Miao, Shihong Xu, Hao Liu, Pei Zhang, Buhan Huazhong Univ Sci & Technol State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China

This paper presents an effective fault location technique for transmission grids based on phasor measurement units (PMUs). High accuracy in fault location is achieved by using both the fault observability with PMUs placement and an accurate distributed parameter line model for the transmission lines. The work performed in this paper is provided with high performance which is simplicity, sensitivity, stability and featuring robustness to the uncertainties in fault inception angle, load current and fault path resistance, and the accuracy and reliability of the calculation for the technique is very high. This paper illustrates the characteristics of the proposed algorithm and evaluates its performance by using transient fault data obtained from PSCAD/EMTDC simulations. (C) 2012 Published by Elsevier Ltd.

关键词： Fault location Phasor measurement units (PMUs) distributed parameters PSCAD/EMTDC simulation tests

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Adaptive control scheme for uncertain time-delay systems

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AUTOMATICA 2012年第8期48卷 1536-1552页

作者： Bresch-Pietri, Delphine Chauvin, Jonathan Petit, Nicolas MINES ParisTech Ctr Automat & Syst Unite Math & Syst F-75272 Paris France IFP Energies Nouvelles Dept Controle Signal & Syst F-92852 Rueil Malmaison France

The paper exposes some of the potential of a recently introduced backstepping transformation for linear uncertain time-delay systems to address the classic problems of equilibrium regulation under partial measurements, disturbance rejection, parameter or delay adaptation. For each of these problems, an implementable control strategy is proposed. It is analyzed through a convergence analysis of infinite dimensional dynamics, based on a transport partial differential equation representation of the estimated input delay and the mentioned backstepping transformation. The considered controllers contain this representation of the system, under the form of a distributed parameter system, and use it to determine relevant adaptation strategies. An illustration example is proposed. (C) 2012 Elsevier Ltd. All rights reserved.

关键词： Time-delay systems Indirect adaptive control distributed parameters

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