Calculation of Voltage Unbalance in Transmission Systems due to AC Railway Operation: A simplified Methodology Using Network Admittance Matrix

Athanasios Stamatopoulos, Henrik Vikelgaard, Hesam Khazraj, Filipe Miguel Faria da Silva, Claus Leth Bak

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

Modern AC railway is well known for introducing large asymmetrical loads which can lead to considerable levels of voltage unbalance in power transmission systems. Unbalance assessment is often limited to a single traction substation contribution and only at the connection point. However, as unbalance propagates from the railway feeding nodes through the electric network, interactions between different traction loads can be significant, and therefore should not be neglected. Three-phase power flow calculations implemented by power systems software can be used for this kind of studies. As an alternative, this paper proposes a simplified but efficient methodology for calculating voltage unbalance through the entire system due to one or multiple ac traction loads. The main idea behind this approach is the simplification of the power flow problem into a system of linear equations which can be solved using the admittance matrix of the network. The good accuracy and the straightforward application of the suggested method can make it particularly useful in planning activities of railway operators.
Original languageEnglish
Title of host publicationProceedings of the IEEE 18th International Conference on Environment and Electrical Engineering and 2nd Industrial and Commercial Power Systems Europe
Number of pages6
Place of PublicationPalermo, Italy
PublisherIEEE Press
Publication dateJun 2018
Pages1-6
Article number8493488
ISBN (Print)978-1-5386-5187-2
ISBN (Electronic)978-1-5386-5186-5
DOIs
Publication statusPublished - Jun 2018
EventIEEE 18th International Conference on Environment and Electrical Engineering and 2nd Industrial and Commercial Power Systems Europe - Palermo, Italy
Duration: 12 Jun 201815 Jun 2018
https://www.eeeic.net/eeeic/

Conference

ConferenceIEEE 18th International Conference on Environment and Electrical Engineering and 2nd Industrial and Commercial Power Systems Europe
CountryItaly
CityPalermo
Period12/06/201815/06/2018
Internet address

Keywords

  • AC Railway
  • traction load
  • voltage unbalance
  • unbalance calculation

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    Stamatopoulos, A., Vikelgaard, H., Khazraj, H., Silva, F. M. F. D., & Bak, C. L. (2018). Calculation of Voltage Unbalance in Transmission Systems due to AC Railway Operation: A simplified Methodology Using Network Admittance Matrix. In Proceedings of the IEEE 18th International Conference on Environment and Electrical Engineering and 2nd Industrial and Commercial Power Systems Europe (pp. 1-6). [8493488] IEEE Press. https://doi.org/10.1109/EEEIC.2018.8493488