Amirkabir University of Technology AUT Journal of Electrical Engineering 2588-2910 45 1 2013 10 01 Power Quality Improvement in Traction Power Supply Networks Power Quality Improvement in Traction Power Supply Networks 9 15 427 10.22060/eej.2013.427 EN A. Ghassemi MSc School of Railway Engineering, Iran University of Science and Technology,Tehran, Iran E. Zarezadeh MSc School of Railway Engineering, Iran University of Science and Technology, Tehran, Iran S. Saeed Fazel BSc student of Railway Engineering, Iran University of Science and Technology, Tehran, Iran Journal Article 2015 10 06 AC railway traction loads are usually huge single phase loads. As a result, a significant amount of <br />Negative Sequence Current (NSC) is injected into utility grid. Moreover, harmonics and consumption of<br />reactive power are further power quality problems that the supply network is encountering. In this paper, a<br />compensation strategy with the aid of Railway Power Conditioner (RPC) is proposed to overcome the abovementioned<br /><br />problems. Firstly, different kinds of traction transformers are evaluated and Y/Δ traction<br />transformer is chosen. Then, a compensation strategy is initiated that is valid for all kinds of traction<br />transformers and a control system is proposed based on that. Finally, the correctness of the analysis and<br />proposed strategy is verified by the simulation results using  Matlab/Simulink software. https://eej.aut.ac.ir/article_427_18997733ec258a9fcaf239cc55d53363.pdf