Harmonic analysis of traction power supply system: case study of Addis Ababa light rail transit

IF 1.9 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC IET Electrical Systems in Transportation Pub Date : 2021-05-21 DOI:10.1049/els2.12019

Shimelis Atli Assefa, Asegid Belay Kebede, Demissu Legese

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Abstract

Addis Ababa, the capital of Ethiopia, inaugurated the first electrified light rail transitsystem 4 years ago in September 2015, which makes it the first of its kind in sub-Saharan and eastern African countries. The railway line has a total length of 34.25 km with 39 passenger stations and 19 traction substations. Currently, the performance of the traction power supply system degraded severely due to the existence of harmonics in the traction network. Realizing the above problem, the harmonic analysis of Addis Ababa light rail transit electrified power supply system is presented. The analysis is performed on one of the substations called ‘Lideta’ rectifier substation. To this end, mathematical modelling and analysis of the traction main components such as the catenary, the traction transformer, the traction rectifier and the load have been done. Finally, MATLAB simulation has been performed, and the result comes with a significant reduction in harmonic distortion, which is far below the 5% limits of IEEE standard.

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牵引供电系统谐波分析——以亚的斯亚贝巴轻轨交通为例

四年前的2015年9月，埃塞俄比亚首都亚的斯亚贝巴开通了首个电气化轻轨系统，这是撒哈拉以南非洲和东非国家的首个电气化轻轨系统。该线全长34.25公里，设有39个客运站和19个牵引变电所。目前，由于牵引网络中谐波的存在，导致牵引供电系统的性能严重下降。针对上述问题，对亚的斯亚贝巴轻轨供电系统进行了谐波分析。分析是在一个名为“Lideta”整流变电站的变电站上进行的。为此，对牵引链线、牵引变压器、牵引整流器、牵引负载等牵引主要部件进行了数学建模和分析。最后，进行了MATLAB仿真，结果表明谐波失真明显降低，远低于IEEE标准的5%限值。

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