Abstract
Trolleybus type power supply using a two-pole overhead catenary system has been used for over one hundred years. However, energy demand in this type of road transport is the lowest. The main disadvantage of this type of transport is the lack of flexibility. Road electric vehicles equipped with batteries, which are now more and more often being put into service, allow for autonomous run on the roads without overhead contact wires. Therefore, it is possible to use them in a more flexible manner. The main problem is a limited range of autonomous run and long charge time of batteries. The paper presents a concept consisting in the application of an overhead catenary for supplying electric and hybrid vehicles (including automobiles) when a vehicle is in motion (mobile charging). Electric trucks are equipped with controlled current collectors allowing for connection with an overhead catenary during driving. Application of this solution to automobiles is rather impossible, which prevents them from being supplied directly from a catenary. The basis of the original concept presented in the paper is the creation of automobile convoys supplied via a truck equipped with current collectors. A description of the proposed system and an algorithm of its operation are presented in the paper. The discussed transport system has significant advantages in comparison to completely autonomous electric vehicles: increased range of driving with lower capacity of batteries on board and flexibility of use, longer life-time of batteries, lower energy consumption. The paper compares the proposed system with the currently used ones, which employ charging of automobiles during stops, but also underlines the advantages of the first solution.
Highlights
In Sweden, currently tests are being conducted for binary catenary supply of electric trucks equipped with current collectors
Other studies are carried with the focus being put on solutions for road transport oriented towards reduction of energy consumption and increase of traffic safety
- higher reliability, - lower transmission losses, - lower EMF emission, - higher power of transfer
Summary
In Sweden, currently tests are being conducted for binary catenary supply of electric trucks equipped with current collectors. In case of electric or hybrid automobiles with batteries, modern technical solutions for a catenary and smart current collectors would allow smooth drive at the demanded speed along sections with or without a catenary. Equipment required for car control automation process allowing cars to drive at minimum spacing is currently being installed in serially manufactured cars It is possible, using different available solutions and by modernizing them, to create a. New road transport system, which could reduce fuel consumption and the number of drivers, which constitutes 70% of exploitation costs of cars [7].
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