A comparative study of different transformer connections for railway power supply- mitigation of voltage unbalance

Gurkan Firat, Guangya Yang, Haider Ali Hussain Al-Ali

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Abstract

The railway represents a large power consumer that can cause uneven loading of the phases in the high voltage grid. These unbalanced loads supplied by the utility may lead to voltage unbalance problems in the system and thereby affects the other consumers connected to the same network. It is fact that, voltage unbalance appears mainly as a result of unbalanced currents at the points of common coupling drawn by unevenly distributed loads. Because of a significant amount of negative sequence current injected to the system, the power system components will suffer from consequent negative effects such as overheating, additional losses of lines and transformers, interference with communication systems etc. This paper presents a comparative study of some transformer connections which commonly used in railway supplying AC traction loads, for voltage unbalance mitigations. Simulations for comparison of transformers are carried out and the results are also compared with the values obtained by the voltage unbalance estimation formulas.
Original languageEnglish
Title of host publicationProceedings of 10th International Conference on Advances in Power System Control, Operation & Management (APSCOM 2015)
Number of pages6
PublisherIEEE
Publication date2015
DOIs
Publication statusPublished - 2015
Event10th IET International Conference on Advances in Power System Control, Operation and Management - Hong Kong, Hong Kong
Duration: 8 Nov 201512 Nov 2015
Conference number: 10

Conference

Conference10th IET International Conference on Advances in Power System Control, Operation and Management
Number10
Country/TerritoryHong Kong
CityHong Kong
Period08/11/201512/11/2015

Keywords

  • Electrified railways
  • Traction loads
  • Voltage unbalance
  • Transformer connections

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