Abstract
Two variants of electricity transmission from the Transfer-Switching Station (TSS) to the battery charging station were analysed in the paper. The first variant under analysis referred to the transmission of electricity via a three phase a.c. line with rated voltage of 15 kV. In the second variant of electricity transmission, the d.c. line with the working voltage of 1500 V was used. For both variants, lines and other equipment such as transformers, rectifier system and voltage stabilisation system in the battery charging station were modelled. For both solutions, analysis of energy per annum was conducted depending on the distance of the charging station from the TSS. On top of this, the simultaneous operation of several chargers was taken into account, which would correspond to the case of charging many buses at the same time from a single power line. The paper demonstrates that in the case of the analysed electricity transmission systems in the electric bus battery charging systems it is possible to use a more advantageous solution, which is characterised by reduced power and energy losses.
Highlights
Operated buses are becoming a more and more popular means of transport
Calculations of the power and energy losses were performed for cases of powering of one, two or three stations using a single power line
In the case of reduced transmitted power, (1 or 2 charging stations powered from the line) it is possible to indicate the distance ranges for which reduced energy losses will be obtained using the d.c. systems
Summary
Operated buses are becoming a more and more popular means of transport. The main reason for the use of the electric power in the municipal transport is the carbon efficiency which is of particular significance in densely populated areas (cities). Efficient and correct performance of the battery charging process requires the appropriate powering of the charging station [6,7,8,9,10]. The paper provides the comparison of the methods of powering of the battery charging stations in electric buses depending on the type of the supply voltage (a.c. or d.c.). The structure of both systems was presented, commencing from the TSS and ending with the charging station. The efficiencies of its respective sections were taken into consideration and on this basis, analysis of power and energy losses was carried out during the charging process with the electricity transmission by means of a.c. or d.c. lines
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