FILTERING OF HARMONICS IN DC TRACTION SUBSTATION SYSTEM

Abstract

Abstract: The railways are the most important and modern means of transportation are used to transport a large number of people, and also used in the industrial field to transport heavy weight and raw materials for very long distances. Direct current (DC) electrified railway systems show many power quality problems such as harmonic, reactive power, unbalanced and low power factor. Our study concentrated on the propagation of currents harmonics in the electric network and their filtering solutions. In this article we made a model in Matlab/Simulink of a real DC traction substation which is located in the mineral line Tebessa - Annaba (in east of Algeria), this line transport raw materials such as iron and phosphate. We present in this work to mitigate harmonic currents the passive filtering, using filters (tuned at frequencies 11 and 13) at two different locations before and after the transformer which freedies the DC traction substation. The results of simulations with the proposed solution give the best results with minimum values of total harmonic distortion (THD) in both cases.