Impact of the harmonic pollution of railway locomotive on the sound system: Experimental measurement, modelling and simulating

Abstract

Air pollution caused by the transport sector has become a very worrying subject. To minimize toxic gas emissions, people start to prefer rail transportation. This high demand has caused high energy consumption in the electric railway. Thus, Moroccan Railway Company was obliged to use different traction locomotives of different technologies which can generate electromagnetic interferences between systems. Reason why the study of electromagnetic pollution has become a necessity to avoid these inter-system electromagnetic disturbances by analysing the experimental measurements on the railway site and by proposing a solution which is the implementation of an active filter capable of eliminating the parasites caused during the connection of the locomotive. However, the authorization to put into operation remains a real subject of study since different parameters must be taken into account, namely the weight, the location, the size and the electromagnetic interferences (EMI) of the filter. This paper discusses the electromagnetic noise by analyzing the impact of the auxiliary power supply quality generated by electric locomotive E1250 on the sound systems when it is coupled to multi-unit Corail cars and by detailing an overview of the conversion chain located in the electric locomotive under test and the sound system installed in Corail car which keeps passengers constantly informed when approaching and arriving at a station, and gives them other indications about the train. Next, static test bench and dynamic experimental tests will be measured in order to determine the Electromagnetic Compatibility (EMC) disturbances in the Common Mode (CM) by studying the harmonics generated by the static converter that feeds the Corail cars, and analyzing their impact on all operating systems especially sound system since it is considered as a very sensitive organ to the least source of noise. In the end, the conversion system will be modeled and a proposed solution will be implemented to mitigate the electromagnetics noises.