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Modified Voltage Control Law for Low Frequency Railway Power Systems

[+] Author Affiliations
John Laury, Lars Abrahamsson, Math Bollen

Luleå University of Technology, Skellefteå, Sweden

Paper No. JRC2017-2224, pp. V001T09A003; 10 pages
  • 2017 Joint Rail Conference
  • 2017 Joint Rail Conference
  • Philadelphia, Pennsylvania, USA, April 4–7, 2017
  • Conference Sponsors: Rail Transportation Division
  • ISBN: 978-0-7918-5071-8
  • Copyright © 2017 by ASME


In today’s Swedish and Norwegian low frequency railway power system the voltage at a converter is controlled such that its voltage will drop with increased reactive power output. However, for low frequency railways the influence of active power on voltage is larger compared to public power systems and alternative methods are interesting to investigate.

This paper presents a modified voltage control law for increased load sharing between converter stations and reduce the risk for converter overload in low frequency railways power systems. The modified voltage control law is derived mathematically and tested with different droops for two case studies. The results confirms the increased load sharing between the converter stations.

The results are analysed and discussed; ideas are presented to counteract some of the negative impacts of the modified voltage control law.

Copyright © 2017 by ASME



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