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Relevant bibliographies by topics / Frequency dependent transmission line emulation

Academic literature on the topic 'Frequency dependent transmission line emulation'

Author: Grafiati

Published: 6 September 2023

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Dissertations / Theses
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Conference papers

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Journal articles on the topic "Frequency dependent transmission line emulation"

1

Gustavsen, B. "Validation of Frequency-Dependent Transmission Line Models." IEEE Transactions on Power Delivery 20, no. 2 (April 2005): 925–33. http://dx.doi.org/10.1109/tpwrd.2004.837676.

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Gustavsen, B. "Frequency-dependent transmission line modeling utilizing transposed conditions." IEEE Transactions on Power Delivery 17, no. 3 (July 2002): 834–39. http://dx.doi.org/10.1109/tpwrd.2002.1022812.

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Gustavsen, B. "Frequency Dependent Transmission Line Modeling Utilizing Transposed Conditions." IEEE Power Engineering Review 22, no. 5 (May 2002): 70. http://dx.doi.org/10.1109/mper.2002.4312226.

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Castellanos, F., and J. R. Marti. "Full frequency-dependent phase-domain transmission line model." IEEE Transactions on Power Systems 12, no. 3 (1997): 1331–39. http://dx.doi.org/10.1109/59.630478.

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Yang, Jian Wei, Ping Chen, Yu Zhang, Zhu Ma Yu, and Xin Long Liu. "Study of Breeze Vibration of Overhead Transmission Lines with Dampers Using FEM Analysis." Advanced Materials Research 940 (June 2014): 65–68. http://dx.doi.org/10.4028/www.scientific.net/amr.940.65.

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The vertical, steady-state breeze vibration of transmission line with dampers attached are studied using FEM analysis. The lines are simulated by cable element, the dampers by mass element and beam element. The parameters of FEM emulation mode such as breeze vibration force, the conductor self-damping and dampers damping are emphasized by the energy equivalent theory. The breeze vibration force induced by vortex is educed by wind power curve, the hysteresis damping and friction damping of conductor and damper are translated into viscous damping. Results of the FEM emulation show the calculation accuracy of natural frequency of dampers, and prove that it can effectively restrain breeze vibration of transmission lines by installing dampers. The method lays foundation for further research on protecting breeze vibration of transmission lines.

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Huang, F. "Frequency dependent transmission line loss in quasitransversal microwave filters." IEE Proceedings - Microwaves, Antennas and Propagation 141, no. 5 (1994): 402. http://dx.doi.org/10.1049/ip-map:19941259.

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Mishra, Arbind Kumar, Naoto Nagaoka, and Akhihiro Ametani. "A frequency dependent transmission line model for a counterpoise." IEEJ Transactions on Electrical and Electronic Engineering 1, no. 1 (2006): 14–23. http://dx.doi.org/10.1002/tee.20005.

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Mishra, Arbind Kumar, Naoto Nagaoka, and Akhihiro Ametani. "A frequency dependent transmission line model for a counterpoise." IEEJ Transactions on Electrical and Electronic Engineering 1, no. 1 (2006): v—vi. http://dx.doi.org/10.1002/tee.20014.

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Mazumdar, Sushmit, and Kaushik Basu. "Hardware Emulation of Energization of a Long Transmission Line by High-Frequency Power Electronic Converter." IEEE Transactions on Power Electronics 35, no. 9 (September 2020): 9267–80. http://dx.doi.org/10.1109/tpel.2020.2973543.

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Guo, Jing, Gui Shu Liang, and Xin Liu. "Frequency-Dependent Transmission Line Fractional Model and its Solution Based on Skin Effect." Applied Mechanics and Materials 457-458 (October 2013): 1208–11. http://dx.doi.org/10.4028/www.scientific.net/amm.457-458.1208.

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Due to the continuous increasing of operating frequency in the power system and the transmission speed, under the high frequencies of the transmission line calculation and simulation process, it is necessary to consider the frequency-dependent properties. At present, the frequency-dependent transmission line modeling has a variety of methods, but in the modeling and calculation of frequency variable term, processing is relatively complicated. This article will introduce transmission line equation of fractional calculus, intuitive representation of frequency varying parameters, and by a time-domain fractional solution, simplify the operation, improve the computational efficiency. Application of this algorithm for fractional differential equations can be obtained the voltage and current responses at any point in the transmission line. Thesis also by comparison with actual example, confirmed the validity and feasibility of the algorithm. At the same time, proposed algorithm can be extended to the multiple conductor transmission lines of fractional order model, also has certain applicability.

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Dissertations / Theses on the topic "Frequency dependent transmission line emulation"

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Cokkinides, George J. "Frequency dependent transmission line modeling with grounding representation." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/15494.

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Tavighi, Arash. "A frequency-dependent multiconductor transmission line model with collocated voltage and current propagation." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/60791.

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This research contributes to developing a time domain and a frequency domain formulations to solve electromagnetic transients in power system with multiconductor overhead transmission lines. The time domain solution introduces a frequency dependent transmission line model “FDLM”. For the development of the FDLM a fundamental constraint is added to the classical line equations to maintain the symmetry between electric and magnetic fields. As a result, voltage waves and current waves travel together and the characteristic impedance remains uniform along the line. With this premise, a constant real transformation matrix can be obtained to diagonalize the line functions with high accuracy. This feature can greatly facilitate the line modelling as opposed to the existing line models which require complex frequency dependent transformation matrices for their diagonalization. The use of a single constant real transformation matrix for the voltage and current waves which is exact over the frequency range enables FDLM to provide higher accuracy and numerical efficiency than the existing line models while it complies with the physical system. The accuracy of the FDLM is assessed through comparisons with a newly developed Discrete Time Fourier Series frequency domain solution. This methodology is based on the correct specification of the time window and frequency window widths. Guidelines are provided for this set up which avoids the typical Gibbs and aliasing errors related to the classical frequency domain solutions. The proposed frequency domain solution is simpler to implement than the most commonly used numerical Laplace transform solution while it does not require further considerations to use damping factors or windowing functions.
Applied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate

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Zhong, Bing. "Lossy Transmission Line Modeling and Simulation Using Special Functions." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/195307.

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A new algorithm for modeling and simulation of lossy interconnect structures modeled by transmission lines with Frequency Independent Line Parameters (FILP) or Frequency Dependent Line Parameters (FDLP) is developed in this research. Since frequency-dependent RLGC parameters must be employed to correctly model skin effects and dielectric losses for high-performance interconnects, we first study the behaviors of various lossy interconnects that are characterized by FILP and FDLP. Current general macromodeling methods and Model Order Reduction (MOR) algorithms are discussed. Next, some canonical integrals that are associated with transient responses of lossy transmission lines with FILP are presented. By using contour integration techniques, these integrals can be represented as closed-form expressions involving special functions, i.e., Incomplete Lipshitz-Hankel Integrals (ILHIs) and Complementary Incomplete Lipshitz-Hankel Integrals (CILHIs). Various input signals, such as ramp signals and the exponentially decaying sine signals, are used to test the expressions involving ILHIs and CILHIs. Excellent agreements are observed between the closed-form expressions involving ILHIs and CILHIs and simulation results from commercial simulation tools. We then developed a frequency-domain Dispersive Hybrid Phase-Pole Macromodel (DHPPM) for lossy transmission lines with FDLP, which consists of a constant RLGC propagation function multiplied by a residue series. The basic idea is to first extract the dominant physical phenomenology by using a propagation function in the frequency domain that is modeled by FILP. A rational function approximation is then used to account for the remaining effects of FDLP lines. By using a partial fraction expansion and analytically evaluating the required inverse Fourier transform integrals, the time-domain DHPPM can be decomposed as a sum of canonical transient responses for lines with FILP for various excitations (e.g., trapezoidal and unit-step). These canonical transient responses are then expressed analytically as closed-form expressions involving ILHIs, CILHIs, and Bessel functions. The DHPPM simulator can simulate transient results for various input waveforms on both single and coupled interconnect structures. Comparisons between the DHPPM results and the results produced by commercial simulation tools like HSPICE and a numerical Inverse Fast Fourier Transform (IFFT) show that the DHPPM results are very accurate.

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Vakanas, Loizos Petrou 1964. "An integral equation method for the evaluation of the frequency-dependent per unit length inductance and resistance matrices for a uniform multiconductor lossy transmission line system." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277100.

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The problem of electromagnetic field penetration in the finite-resistivity conductors of a uniform, multiple, coupled transmission line system (MTL) is considered. Under the assumption of quasi-transverse electric and magnetic (quasi-TEM) mode of propagation, the problem of determining the per-unit-length resistance and inductance matrices for such MTL systems reduces to solving a quasi-magnetostatic problem. An integral equation for the current density distribution inside the conductors is formulated and solved numerically using the method of moments. From straightforward energy considerations and the current density distribution, the per-unit-length resistance and inductance matrices are calculated. Several microstrip configurations are then analysed and the effects of the geometrical characteristics of the structures on the per-unit-length inductance and resistance matrices, as well as their frequency dependence are investigated.

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Challa, Kiran Kumar. "Algorithms and Testbed for Synchronous Generator Parameter Estimation." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5884.

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The development of dynamic power system component models became increasingly important in the modern grids dominated by high penetration of renewables because of the increased dependency of planning and operational decisions on dynamic simulation studies. The parameters of synchronous machines and associated control models play significant role in the overall model of the grid, which need to be updated regularly by the utilities. So, the parameters of the power plants are calibrated/estimated either using off-line testing or online measurements from phasor measurement units (PMU) or digital fault recorders (DFR). Development of individual generator models is feasible only if the PMU/DFR data is available for each generator in a power plant. Otherwise, they can provide only aggregate model of a generating plant as PMU/DFRs are usually placed in substations. Digital protective relay (DPR) records are available for individual generators in any generating plant. This thesis explores the possibilities of utilizing DPR records of individual generators for parameter estimation. About 36 relay records have been collected from a 247 MVA, 15.75 kV generator of a thermal plant in Karnataka. It is found that most of the records contain at the most 3 seconds data. The relay records should contain prefault data, during fault data and some post-fault data for accurate estimation. However, from the collected records only a small percentage of the records are found to be useful. Existing methods of parameter estimation using PMU/DFR data failed to work with the short duration records. There is no prior work reported in the literature which uses short relay records for parameter estimation of the synchronous generators. Constrained iterated unscented Kalman filter (CIUKF) and enhanced scattered search (eSS) algorithms are proposed for the parameter estimation using DPR records in this thesis. Parameters of the turbo alternator and its excitation system are estimated from the relay records collected using the proposed algorithms and the results are found be accurate. For the holistic validation of the developed algorithms and faster adaptation by GENCOs, realistic testbeds are needed. A scaled-down generalized substation model for translational research in smart grids is developed, which can be configured to operate in 7 widely used substation bus bar schemes with prevalent current transformer (CT) configurations. All the potential transformers (PT) and CT measurements, circuit breaker (CB), isolator and earth switch status signals are made available to configure any protection strategy like bus-bar protection, unit protection schemes, etc. precisely the same way they get implemented in the field. For studying the control interactions between renewable and conventional sources, frequency dependent (FD) transmission line models need to be physically realized. A new algorithm is proposed to fit a reduced-order R-L equivalent circuit to the frequency response of the modal impedances of a transmission lines. A close enough fitting is achieved with lesser number of passive elements using the proposed method compared to the widely used vector fitting algorithm. A scaled-down model of WECC 3-machine 9-bus system is developed with frequency dependent lines by selecting suitable tower and conductor configurations. Reduced order lumped parameter FD (LPFD) line models are derived for the 230 kV transmission lines in WECC system using the proposed fitting algorithm. A systematic procedure to scale down the 230 kV LPFD line models to 220 V laboratory model is presented. An experimental prototype of the scaled-down LPFD line is developed. Clarke and inverse Clarke transformations are implemented using specially designed 1-φ transformers. The inductances of the scaled-down model are realized using amorphous cores. Based on the prototype testing results, the six lines of WECC system are fabricated considering manufacturing tolerances. Parameter estimation using practical DPR records, development of substation model including detailed station configurations and CT arrangements, and physical realization of a frequency dependent power transmission line model in the laboratory are first of its kind efforts in the literature to the best of our knowledge.
MHRD, Govt. of India for the financial support through scholarship and DST, Govt. of India for supporting through the Fund for Improvement of Science and Technology (FIST) program and Robert Bosch Center for Cyber-Physical Systems (RBCCPS), IISc for the financial research grant

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Mazumdar, Sushmit. "Hardware Emulation of a Long Transmission Line by High Frequency Power Electronic Converter for the study of Switching Transients." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/5099.

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To ensure smooth functioning of the grid, the reliability and robustness of the power system equipment needs to be precisely evaluated during their development process. But direct on- eld tests of most of the equipment are not possible. This urges for having an emulated environment which will operate in real-time thereby capturing all the physical phenomenon of the Hardware Under Test (HUT). The control and pro- tection equipments are generally tested by Hardware-In-The-Loop (HIL) technology, where a Real-Time Simulator (RTS) implemented on a digital platform, interacts with the HUT in real-time. Also high power rating devices can be tested by adopting a di erent technology known as Power-Hardware-In-The-Loop (PHIL), where a Power Amplifier (PA) acts as the interface between the RTS and HUT. The most expensive component of the PHIL is the general purpose RTS like Opal-RT or RTDS. To reduce the cost, RTS can be made application speci c. This Application Specific-Real-Time Simulator (AS-RTS) and the PA collectively simulating the test environment for the HUT is termed as the Hardware Emulator (HE) of that particular application. Being the fundamental component of the power system, HE of transmission line is required to bridge the gap between the source and load emulators. Hence a programmable type of Transmission Line hardware Emulator (TLE) needs to be developed which will have the exibility of emulating transmission line with varying line parameters. The general architecture of a TLE comprises of two major components, namely, Ob- server and Power Ampli er, where the AS-RTS for the TLE is termed as the Observer. With the line end voltages as the input, the Observer solves the emulated line model in real-time and estimates the line end currents which are then tracked by the PA by controlling its output currents. Utilizing the exibility of controlling power electronic converters, the PA is comprised of two back-to-back 3 Voltage Source Converters (VSCs) operating under closed loop current control mode. Based on similar archi- tecture, emulation for short lines during steady state and 3 short-circuit faults are reported in literature, where the transmission line is modeled as a lumped resistor in series with a lumped inductor. For analyzing the performance of the grid at the transmission level, it becomes necessary to consider long lines. Emulation of a dis- tributed parameter lossy transmission line during steady state and 3 faults using Method of Characteristics (MOC) has also been performed. However with MOC, the computational burden of the Observer signi cantly increases. i Hardware emulation of energization of a long transmission line is not addressed in either of the previous work. Simultaneous switching of all the phases of one end of the transmission line with a shunt reactor connected at the other end has been studied in this work and the transients in the source end line currents during the instant of switching has been emulated by the developed TLE. When an unenergized transmission line is suddenly connected to a voltage source, high frequency transients appear in the line currents due to the travelling wave phenomenon before the at- tainment of steady state. After studying di erent line models for lossy long lines, a travelling wave based numerical solution is identi ed which can be solved by the Ob- server in real-time. The Observer is implemented on a Zynq System-On-Chip (SoC) platform from Xilinx. As the transient current contains high frequency components, the switching frequency of the VSC should be su ciently high in order to minimize the phase loss of the current control loop of the PA. So a Silicon Carbide (SiC) based power electronic converter has been designed and fabricated to implement the PA of the TLE. A comprehensive analysis has been made to choose the switching fre- quency of the power electronic converter and the sampling frequency of the Observer, while adhering to the power and digital hardware constraints (maximum switching frequency limit, clock speed, etc.). Further, the hardware topology for the imple- mentation of the TLE as well as scaling of the actual transmission line to laboratory level emulator without compromising on the system dynamics has been presented. Finally the relevant simulation waveforms are matched with the experimental results performed on the developed hardware prototype of the TLE, thus validating the TLE test bench setup.

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Smith, Rodriguez Edison Manuel. "Full-space conformal mapping for the calculation of the parameters of overhead transmission lines and underground cables." 2016. http://hdl.handle.net/1993/31733.

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This thesis presents a method to obtain the per-unit-length electrical parameters of a given overhead transmission line or underground cable in an unbounded space considering the effect of the ground. This is achieved using a two-dimensional conformal mapping technique, which consists of a modified bilinear transformation to map a semi-open half-space problem into a unit circle. The Helmholtz equations describing the quasi-stationary approximation for the electromagnetic field behaviour are solved using finite element method, with the aid of commonly used commercial software program, COMSOL Multiphysics. The per-unit-length resistance, inductance and capacitance are calculated using the proposed mapping method, the truncation of the original space method and then compared with the analytical solution obtained from Carson's approximation for the overhead lines and Wedepohl's formulation for the underground cables.
October 2016

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Chang, Jiun-Tsyr Jack. "Implementation of a full frequency-dependent transmission line model within the framework of the (OVNI) real-time power system simulator." Thesis, 2004. http://hdl.handle.net/2429/16252.

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This thesis presents the methodology to implement a full frequency-dependent transmission line model in UBC's OVNI (Object Virtual Network Integrator) real-time power system simulator. OVNI utilizes an object-oriented approach to represent and implement its element models. Object-oriented programming permits a flexible, reliable, and expandable solution to the simulation program. In particular, OVNI represents each element model as a class inheriting common characteristics and properties from a parent class of basic elements. Each element object interacts with the network solver, the core, only by exchanging such parameters as external node voltages, external node names, the equivalent conductance matrix and the equivalent history source vector through some well-defined member functions. Model developers only needs to correctly and efficiently implement these member functions to successfully incorporate the model with the core. This clean-cut abstraction between element models and the core provides model developers with complete freedom and independence while designing, implementing, and upgrading models of different electric properties and complexities. The transmission line model implemented in this thesis is a phase-domain full frequency-dependent model (zLine). This model was developed in Ph.D projects by Castellanos [15] and Yu [16]. The model is suitable for time-domain EMTP (Electromagnetic Transient Program) simulations within OVNFs real-time framework. Z-line is accurate, efficient, numerically stable and strongly suited for multi-circuit asymmetrical line configurations. The model divides the line length into a number of small segments and separates the wave propagating in each segment into a constant idealline section and a frequency-dependent loss section. A numerically stable curve fitting routine was modified to synthesize elements of the loss matrix so that the equivalent time-domain model for the loss section can be formulated with an integration rule. The implementation of zLine in this thesis work is divided into three major tasks: preprocessing and initialization of model parameters, computation of equivalent conductance matrix, and update of equivalent history sources. The pre-processing task involves three subtasks. First of all, it requires the execution of mtLine, a program that generates line parameter matrices from geometrical conductor configurations. Moreover, it requires the execution of a modified fitting routine that synthesizes the frequency-dependent loss matrix with a series of rational functions. Finally a series of I/O routines are required to organize and generate the input files necessary to run the programs mentioned above. An ANSI C compatible function is chosen to integrate the execution of all those routines under the control of the simulator. The update of history sources and computation of conductance matrices take advantage of the abstraction offered by object-oriented programming between the line and the modelling segments. Each history source update and matrix computation is performed first at the segment level for each zLine segment and then accumulated at the line level to form the overall history vector and conductance matrix of the line. Internal nodes are hidden away by applying the node-hiding technique to reduce network complexity and further streamline solution efficiency. A comprehensive set of test cases are run and compared with proven results and exact models in Microtran to ensure the correctness and accuracy of the implementation methodology. zLine's accuracy and absolute numerical stability for any asymmetrical line configurations render it an ideal candidate as the first frequency-dependent line model to be included with OVNI.
Applied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate

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Book chapters on the topic "Frequency dependent transmission line emulation"

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Dhua, Rajashree, and Chiranjib Koley. "Simulation of Frequency Dependent Transmission Line for Identification of Faults and Switching over Voltages." In Advances in Intelligent Systems and Computing, 311–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-35314-7_36.

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Conference papers on the topic "Frequency dependent transmission line emulation"

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Wardzinska, Agnieszka, and Wojciech Bandurski. "Frequency dependent and nonuniform parameters transmission line model." In 2016 IEEE 20th Workshop on Signal and Power Integrity (SPI). IEEE, 2016. http://dx.doi.org/10.1109/sapiw.2016.7496266.

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Freitas, M. A., S. Kurokawa, and J. Pissolato. "Corona effect in frequency dependent transmission line models." In Exposition: Latin America. IEEE, 2008. http://dx.doi.org/10.1109/tdc-la.2008.4641753.

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Wardzinska, Agnieszka, and Wojciech Bandurski. "Calculations of frequency dependent transmission line model for coupled exponential line." In 2017 IEEE 21st Workshop on Signal and Power Integrity (SPI). IEEE, 2017. http://dx.doi.org/10.1109/sapiw.2017.7944022.

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Johannesson, Niclas, Tetiana Bogodorova, and Luigi Vanfretti. "Identifying low-order frequency-dependent transmission line model parameters." In 2017 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe). IEEE, 2017. http://dx.doi.org/10.1109/isgteurope.2017.8260138.

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Gustavsen, Bjorn. "Robust passivity enforcement of frequency dependent transmission line models." In 2007 IEEE Workshop on Signal Propagation on Interconnects. IEEE, 2007. http://dx.doi.org/10.1109/spi.2007.4512241.

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Campos, J. C. C., J. Pissolato Filho, A. J. Prado, and S. Kurokawa. "Frequency-dependent transmission line analyses using Clarke extended methodology." In 2005 IEEE Russia Power Tech. IEEE, 2005. http://dx.doi.org/10.1109/ptc.2005.4524697.

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Takeshige, Atsushi, Yuji Ito, Kyoya Takano, Kosuke Katayama, Takeshi Yoshida, Minoru Fujishima, and Shuhei Amakawa. "Causal transmission line model incorporating frequency-dependent linear resistors." In 2017 IEEE 21st Workshop on Signal and Power Integrity (SPI). IEEE, 2017. http://dx.doi.org/10.1109/sapiw.2017.7944045.

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Yu, Yang, Ning Zhang, Quan Hao, Ning Geng, Kai Wang, and Yinghan Zhao. "Frequency Characteristics Analysis on Frequency-dependent Parameters Based Bipolar HVDC Transmission Line." In 2021 IEEE 2nd China International Youth Conference on Electrical Engineering (CIYCEE). IEEE, 2021. http://dx.doi.org/10.1109/ciycee53554.2021.9676961.

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Li, Zhen, Jinliang He, and Bo Zhang. "The influence of frequency dependent soil parameters on transmission line." In 2014 International Conference on Lightning Protection (ICLP). IEEE, 2014. http://dx.doi.org/10.1109/iclp.2014.6973271.

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Fernandes, A. B., and W. L. A. Neves. "Frequency-dependent transformation matrices for phase-domain transmission line models." In Proceedings of Power Engineering Society Summer Meeting. IEEE, 2001. http://dx.doi.org/10.1109/pess.2001.970346.

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