A Method for Interfacing Lumped-Circuit Models and Transmission-Line System Models With Application to Railways
2009 (English)In: IEEE transactions on electromagnetic compatibility (Print), ISSN 0018-9375, Vol. 51, no 3, 833-841 p.Article in journal (Refereed) Published
Transient analysis of lossy multiconductor transmission lines (MTL) have been studied using the finite difference time domain (FDTD) method with lumped loads/devices connected at line terminations. In electrified railway networks series and shunt devices (whose circuit models derived either from experiments/borrowed off the shelf), e.g., transformers, converters, switchgear, signal equipments, etc., are found distributed along the MTL system. To simulate such railway systems involving both transmission lines (TL) and lumped circuits, an interface technique between TL system solved using FDTD and all the lumped circuits solved using ATP/EMTP software (circuit solver) is proposed. This sufficiently accurate method is simple to apply as only instantaneous voltages and currents are transmitted between standalone FDTD routine and circuit solver. Moreover, the user avoids coding complex circuit models within the FDTD, while at the same time efficiently uses the potential of accurate frequency dependant loss models (nonexistent in circuit software) coded in FDTD. The technique is applied on typical electrified railway systems to demonstrate how traction transformers, track circuits, and line interconnections affect the propagating voltages and currents. The method could be beneficial for transient protection and insulation coordination studies in electrified railway systems.
Place, publisher, year, edition, pages
2009. Vol. 51, no 3, 833-841 p.
circuit simulation, crosstalk, power system simulation, transmission line modeling
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-11937DOI: 10.1109/TEMC.2009.2023112ISI: 000269154400031ScopusID: 2-s2.0-69549129397OAI: oai:DiVA.org:kth-11937DiVA: diva2:290565
QC 201110042010-02-012010-01-272011-10-04Bibliographically approved