Abstract
The latest technical solutions provide new opportunities for reducing energy consumption in electrified transport systems. The basic solution is to eliminate vehicles based on resistor start-up system and replace them with vehicles equipped with semiconductor based converter propulsion system (choppers and voltage source inverters). This type of drive also allows to recover energy (recuperation) from train braking, which is repeated very often case of metro lines. The problem is to find the receiver for this energy while the vehicle is braking. Large opportunities are also available when using various types of energy storage devices: stationary installed on the side of traction line and mobile ones used on-board the traction vehicles. Choosing the type of energy storage device for operating conditions, their capacity and the location of installation are complex optimization processes. This type of solution involves significant financial input, which reimbursement is spread over a long period of time. Therefore, it seems rational to seek solutions with limited financial outlay. This paper presents a solution analysis of adjusting the timetable and timeshifts between vehicle streams on the metro line to increase the efficiency of energy recovery of regenerative braking vehicles. This operation will reduce the amount of energy consumption by vehicles from the traction substations. The results presented in the paper were obtained by computer simulation of operation on the first line of the Warsaw subway, assuming that there was no energy storage devices and traction substations were operating without recuperation of the energy to the power system.
Highlights
Electric means of urban transport are characterized by relatively low power of used vehicles and high volume of traffic
The software allows to simulate the operation of the metro line, the following simplifications have been adopted: traffic is carried out with the equal traction vehicles, there are no branches of the line, the traffic resistance assumed for the simulation calculations take into account travelling through tunnels
The article describes the case of the metro line, where modern trains, that allow energy recuperation during braking, are used
Summary
Electric means of urban transport are characterized by relatively low power of used vehicles and high volume of traffic. Under such conditions, the use of recuperative braking in used vehicles can achieve its highest efficiency, up to 40% [1, 2]. Implementation of mentioned algorithms, requires full cooperation with both, the signalling system and whole structure of additional devices that support the work of entire the system Another method of reducing energy consumption may be the optimization of the driving technique for a single train [5, 6]. The proposed method can be used on older lines that have been in operation for a long time, where no future investment in infrastructure is expected
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