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IEEE Transactions on Power Delivery 01/2012; 27(3):1501-1508. · 1.35 Impact Factor
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ABSTRACT: This paper discusses numerical stability problems of a frequency-dependent transmission-line and cable modeling approach used for electromagnetic transient analysis. Time-domain numerical errors due to the discrete computation of convolution integrals can be estimated in terms of transfer function parameters for a given line or cable model. Based on this estimation, a methodology for the improvement of numerical stability is presented. The numerical advantages of the new method are supported by demonstrations and comparisons with existing models. The method presented in this paper is applicable to power cables and transmission lines.
IEEE Transactions on Power Delivery 05/2010; · 1.35 Impact Factor
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ABSTRACT: This paper presents the modeling and simulation studies for the startup of a 250 MVA pumped storage unit in pumping mode and the startup of a 65 MVA hydraulic unit as a corrective action following an uncontrolled islanding of an area due to an extreme contingency. The new synchronous machine (SM) module of EMTP-RV enables the simulation of the machine from standstill and makes it possible to use it for studies including: analysis of the disturbances generated by the operation of the static frequency convertor (SFC) during electrical startup of a pumped storage unit and simulation of system restoration following a complete collapse of a major part of an interconnection. The proposed model is validated by using field measurements from a 250 MVA pumped storage unit for the period from standstill to line operation including the synchronization of the machine to the grid.
Power & Energy Society General Meeting, 2009. PES '09. IEEE; 08/2009
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ABSTRACT: This panel paper presents research activities related to modeling portability between electromagnetic transients simulation programs. Although modern computer programs are provided with sophisticated graphical user interfaces, each program has its own modeling interface and model development methods. There are no portability or interoperability standards between applications of the same type. This issue creates significant and time consuming problems for the users since it is often required in the same organization to perform studies using different applications or to receive models available from different manufacturers using different tools. This paper focuses on methods that can be used for developing and establishing modeling portability. Both model data portability and actual model portability are discussed. The topic is also related to user-defined modeling.
Power & Energy Society General Meeting, 2009. PES '09. IEEE; 08/2009
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ABSTRACT: This paper presents an overview on available tools and methods for the simulation of electromagnetic transients in power systems. Both off-line and real-time simulation tools are presented and discussed. The first objective is to give the reader an overview on the modeling and simulation capabilities in currently available state-of-the-art tools. The second objective is to provide perspectives on research topics and needed enhancements.
IEEE Transactions on Power Delivery 08/2009; · 1.35 Impact Factor
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ABSTRACT: Accurate computation of electromagnetic transients for underground cables and overhead transmission lines requires the frequency domain characterization of two matrix functions: propagation and characteristic admittance. The propagation function constitutes a high order wideband system with inherent time delays. In this paper a weighted fitting technique is presented and advocated for the identification of the propagation function as a rational transfer function. The paper also contributes to theoretical clarifications on vector fitting and orthonormal vector fitting. The application of orthonormal vector fitting is demonstrated together with weighted vector fitting. Although the presentation is also applicable to transmission lines, the numerical examples are focused on underground cables where the frequency dependency problems are more complex.
IEEE Transactions on Power Delivery 08/2008; · 1.35 Impact Factor
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ABSTRACT: This paper presents a new method for computing internal voltages and currents along transmission lines. The approach is an extension to the existing method of characteristics (MoC)-based line models and computes the voltage at internal points as a superposition of forward and backward waves. These waves are obtained by convolution between the reflected wave and the propagation function from the line end to the considered position. This voltage profile component (VPC) permits computing the voltage at arbitrary points along the line while avoiding the error accumulation that can result when cascading line models. The VPC can be utilized with any MoC-based approach and has been used in this paper together with the universal line model in order to obtain a model of very high accuracy. The VPC approach is demonstrated to give more accurate results than a cascade of regular line models in the case of fast front transients.
IEEE Transactions on Power Delivery 08/2007; · 1.35 Impact Factor
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ABSTRACT: This paper presents an overview on available tools for the simulation of electromagnetic transients in power systems. Simulation tools range from specialized computer programs operating in real-time or non-real-time modes, to customized general purpose modeling environments. The various categories of tools are presented with highlights on applicability ranges and available modeling capabilities.
Power Engineering Society General Meeting, 2007. IEEE; 07/2007
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J. Mahseredjian
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ABSTRACT: This paper presents an overview on the currently applied computational methods for the simulation and analysis of electromagnetic transients in power systems. The paper starts by reviewing the fundamental modeling concepts and applicability ranges and follows by focusing on some particular numerical issues and problems. Ongoing research topics are also discussed.
Power Engineering Society General Meeting, 2007. IEEE; 07/2007
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ABSTRACT: This paper is presented as part of an effort by the distribution system analysis subcommittee to establish reference cases for induction machine modeling in distribution system analysis and unbalanced three-phase systems. This panel paper presents analysis results obtained when applying a full time-domain method with load-flow and steady-state initialization. The selected software is EMTP-RV. Problem solution complexities are discussed
Transmission and Distribution Conference and Exhibition, 2005/2006 IEEE PES; 06/2006
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ABSTRACT: The existing approach for solving control systems in the Electromagnetics Transients Program is to insert one-time-step delays for breaking feedback loops when one or more nonlinear functions is encountered. Although this approach may remain acceptable for several well-behaved cases, it provides a nonsimultaneous solution for a nonlinear system. Fast varying components may create instabilities in such a solution and/or simply end up in a wrong operating region. In some cases, it imposes severe limitations on the integration time step for minimizing delays. This paper presents a new Jacobian matrix-based formulation for eliminating numerical delays in the solution of control system equations.
IEEE Transactions on Power Systems 03/2006; · 2.68 Impact Factor
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ABSTRACT: A detailed dynamic arc model may be used to roughly evaluate the interrupting capacity of a breaker and its influence on the deformation of the interrupted current. In some cases the correct computation of the actual arcing time is of crucial importance for assessing the first current-zero crossing of the breaker. Arc models in conjunction with surrounding network details are also used to understand complex arc instability problems. This paper recalls gas circuit breaker models and presents data requirement for such models. The document includes some illustrative examples and typical data.
IEEE Transactions on Power Delivery 08/2005; · 1.35 Impact Factor
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ABSTRACT: This paper presents currently available solution methods for the simulation of power electronics circuits used in most FACTS devices. The notion of varying topology is related to the simulation of such devices at power system level and employing ideal or quasi-ideal switch models. Currently available main stream methods are discussed and some ongoing research topics are identified.
Power Engineering Society Winter Meeting, 2002. IEEE; 02/2002
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ABSTRACT: In this paper, differential incremental or superimposed voltage
and current quantities are used in order to determine directionality of
a fault in a network. It is shown that this can be accomplished by
performing three scalar products between three voltage and current
phasor pairs. The relative levels of these same three scalar products
can be furthermore used to identify the faulted phases. While, in
ultra-high-speed directional comparison relays, superimposed voltage and
current had to be treated in the time domain in order to get speed. In
this paper, all computations are done in the frequency domain
IEEE Transactions on Power Delivery 11/2001; · 1.35 Impact Factor
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ABSTRACT: In this paper differential incremental or superimposed voltage and current quantities are used in order to determine directionality of a fault in a network. It is shown that this can be accomplished by performing three scalar products between three voltage and current phasor pairs. The relative levels of these same three scalar products can be furthermore used to identify the faulted phases. While, in ultra-high-speed directional comparison relays, superimposed voltage and current had to be treated in the time domain in order to get speed, in this paper all computations are done in the frequency domain.
IEEE Power Engineering Review 09/2001; 21(8):61-61.
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J. Mahseredjian
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ABSTRACT: This paper targets software engineering education in both graduate and undergraduate courses for power system engineers. Its objective is to provide ideas for improving the level of training of power system engineers in the power system software engineering area. It is stressed that engineers should be trained to have a systematic approach to problem solving. Students should be exposed to software engineering as soon as possible. By developing software and creating problem solution algorithms, students can understand the most complex concepts in the underlying system engineering. It is important to learn about available possibilities and to learn how actual professional tools are created and what are the limitations. It is recommended to significantly increase the usage of software engineering topics in power systems for attracting students
Power Engineering Society Summer Meeting, 2001. IEEE; 02/2001
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ABSTRACT: Summary form only given. The objective of this paper is to summarize on the currently available solution methods and tools for the simulation of FACTS devices. Since most FACTS devices are based on power electronics components, simulation methods for power electronics circuits are emphasized
Power Engineering Society Winter Meeting, 2001. IEEE; 02/2001
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ABSTRACT: This paper presents a new initialization technique for the
simulation of control diagrams in transient analysis of power systems.
The new technique has been implemented and tested in the EMTP
(Electromagnetic Transients Program). It is based on a generic idea
reusable in other transient analysis applications. The first objective
is to significantly reduce computation time by avoiding unwanted
simulation startup transients. The second objective is to increase the
level of automation for the initialization of control block variables
based on desired steady-state conditions. The new method has been used
for a study in the Hydro-Quebec network with more than 40 controlled
machines aggregating the generation of 30 GW. Comparing the fast
steady-state solution obtained through time-domain simulation, with the
desired steady-state operating conditions, provides validation
Power Engineering Society Winter Meeting, 2001. IEEE; 02/2001
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ABSTRACT: Summary form only given. The objective of this paper is to present and discuss data requirements for detailed circuit breaker models. Such models include circuit breaker arc representation. The presentation targets high-voltage power network transmission line circuit breaker modeling. Implementation and simulation method details are based on EMTP (Electromagnetic Transients Program)
Power Engineering Society Winter Meeting, 2001. IEEE; 02/2001
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ABSTRACT: This paper presents experience in software engineering for recoding a large scale power system analysis application. The application is a transient analysis package named EMTP (Electromagnetic Transients Program). Although the presented material is related only to this software, ideas, tools and methods are applicable to other power system analysis applications. There are several software engineering considerations in recoding a large scale power system application. The most important considerations are the programming languages, software development tools, code documentation methods, validation tools and interfaces. This paper presents and discusses programming language and programming tool choices for the recoded software. Some basic code documentation methods are also discussed
Power Engineering Society Winter Meeting, 2001. IEEE; 02/2001
