Power Quality Improvement in Traction Power Supply Networks

Document Type : Research Article


1 MSc School of Railway Engineering, Iran University of Science and Technology,Tehran, Iran

2 MSc School of Railway Engineering, Iran University of Science and Technology, Tehran, Iran

3 BSc student of Railway Engineering, Iran University of Science and Technology, Tehran, Iran


AC railway traction loads are usually huge single phase loads. As a result, a significant amount of
Negative Sequence Current (NSC) is injected into utility grid. Moreover, harmonics and consumption of
reactive power are further power quality problems that the supply network is encountering. In this paper, a
compensation strategy with the aid of Railway Power Conditioner (RPC) is proposed to overcome the abovementioned

problems. Firstly, different kinds of traction transformers are evaluated and Y/Δ traction
transformer is chosen. Then, a compensation strategy is initiated that is valid for all kinds of traction
transformers and a control system is proposed based on that. Finally, the correctness of the analysis and
proposed strategy is verified by the simulation results using  Matlab/Simulink software.


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