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A rotary frequency converter model for electromechanical transient studies of 16 (2/3) Hz railway systems
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. (Electrical Power Engineering Group)
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. (Electrical Power Engineering Group)ORCID iD: 0000-0003-2109-060X
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. (Electrical Power Engineering Group)ORCID iD: 0000-0003-4074-9529
2019 (English)In: International Journal of Electrical Power & Energy Systems, ISSN 0142-0615, E-ISSN 1879-3517, Vol. 106, p. 467-476Article in journal (Refereed) Published
Abstract [en]

Railway power systems operating at a nominal frequency below the frequency of the public grid (50 or 60 Hz) are special in many senses. One is that they exist in a just few countries around the world. However, for these countries such low frequency railways are a critical part of their infrastructure.

The number of published dynamic models as well as stability studies regarding low frequency railways is small, compared to corresponding publications regarding 50 Hz/60 Hz public grids. Since there are two main type of low frequency railways; synchronous and asynchronous, it makes the number of available useful publications even smaller. One important reason for this is the small share of such grids on a global scale, resulting in less research and development man hours spent on low frequency grids.

This work presents an open model of a (synchronous-synchronous) rotary frequency converter for electromechanical stability studies in the phasor domain, based on established synchronous machine models. The proposed model is designed such that it can be used with the available data for a rotary frequency converter.

The behaviour of the model is shown through numerical electromechanical transient stability simulations of two example cases, where a fault is cleared, and the subsequent oscillations are shown. The first example is a single-fed catenary section and the second is doubly-fed catenary section.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 106, p. 467-476
Keywords [en]
Low frequency railways, 16 (2/3)  Hz, Modelling, Simulations, Transient stability, Rotary frequency converter, Motor generator set, Multi machine system
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-71471DOI: 10.1016/j.ijepes.2018.10.017ISI: 000454377000043Scopus ID: 2-s2.0-85055732778OAI: oai:DiVA.org:ltu-71471DiVA, id: diva2:1261264
Funder
Swedish Transport Administration
Note

Validerad;2018;Nivå 2;2018-11-07 (inah)

Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2019-09-13Bibliographically approved
In thesis
1. Stability of Low-Frequency AC Railways: Models and Transient Stability
Open this publication in new window or tab >>Stability of Low-Frequency AC Railways: Models and Transient Stability
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Low-frequency AC railway grids are unique in the sense that a only few countries around the world uses them, still however, they are an important parts of their countries infrastructures. Due to the usage of a dierent frequency than the public grid of the country, conversion of frequency is needed for the interconnection. The frequency conversion is done by machine based rotary frequency converters or power electronic based static frequency converters.

When reinforcing with new power conversion capacity, mostly static frequency converters are installed since rotary frequency converters for railways have not been manufactured for some time. As more static frequency converterare introduced, the share of rotary frequency converters is reduced. It is not well explored how the stability of low-frequency AC railways is affected with a large share of static frequency converters.

In this thesis, the main goal has been to obtain knowledge of the stability of low-frequency AC railway grids, with focus on synchronous ones. The electromechanical stability of a synchronous low-frequency AC railway is explored through numerical simulations, where the transient stability is the main focus.

The main contributions of this thesis is proposing a model of a rotary frequency converter, proposing a model of a static frequency converter, and transient stability simulations. The model of the rotary frequency converter uses established machine models, whereas the static frequency converter model has been developed with help of measurements. It can be concluded that the proposed static frequency converter model captures the main behaviour of the measurements of a static frequency converter.

The transient stability of synchronous AC railway grids is studied, through numerical simulations. The studied cases are for instance dierent railway grid congurations with dierent types rotary frequency converters and railway grids with mixes of static frequency converters and static frequency converter.

The main conclusion is that the rotary frequency converter fed synchronous railway grids studied are transiently stable, and the studied railway grids where rotary frequency converters are gradually replaced with static frequency converter are also transiently stable. However, it was found that the studied railway grids obtain a heavier oscillatory behaviour when there is a mix of rotary frequency converters and static frequency converters.

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2019
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-71795 (URN)978-91-7790-292-8 (ISBN)978-91-7790-293-5 (ISBN)
Public defence
2019-02-28, Skellefteå, 10:00 (English)
Opponent
Supervisors
Available from: 2018-12-27 Created: 2018-12-13 Last updated: 2019-02-14Bibliographically approved

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Publisher's full textScopushttps://www.sciencedirect.com/science/article/pii/S0142061518314534

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Laury, JohnAbrahamsson, LarsBollen, Math

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