Power Quality Analysis of Ethio-Djibouti Railway Power Supply System

Abstract

Enormous imbalance currents that the single-phase traction loads inject into the transmission systems lead to numerous control quality problems that develop the key challenges in the railway traction system. Power quality parameters have been measured, and a thorough study of influence feature analysis on behalf of the Ethio-Djibouti railway route has been conducted utilizing the 132kV traction substations using MATLAB/Simulink software as a case study. This paper intends to analyze power quality and identify the main harmonic current and voltage harmonics that exceed the recommended limitations in IEEE 519-1992. In the meantime, measurements of power feature at the 132 kV/25 kV level were compared with IEEE 519-1992 to determine the magnitude of energy & current harmonics as thriving as the overall harmonic distortion. The effect of harmonics produced by locomotives on the 132 kV upstream electric grid has been investigated through measurement and simulation. The limits indicated in the IEEE 519-1992 standard are exceeded by the values of individual and total voltage harmonic distortion determined by measurement and modelling at 132 kV and 25 kV, respectively. The voltage imbalance analysis on the 132 kV side is higher than 2%, which is not in compliance with IEEE standard 1159-2009.