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Analysis of the Two-way Power Transmission and Recuperation Efficiency of Solaris Trollino 18 Trolleybuses
Ilko Tarpov
University of Transport Todor Kableshkov
Martina Tomcheva
University of Transport Todor Kableshkov
Last modified:
2022-05-31
Abstract
Key words: trolleybuses, urban electric transport, recuperation, energy efficiency
The paper explores the overall performance test results evaluating the operation of Solaris Trollino 18 trolleybus equipped with regenerative braking system supplemented with a traction battery energy storage system. The trolleybus has been put in operation for provision of proper public transportation services in the city of Sofia (Bulgaria). The research study, therefore, was conducted under real operating conditions distinctive of this particular type of trolleybus and an accurate energy efficiency assessment of the vehicles under discussion was subsequently carried out. The research is based on computer simulation models in addition to the real observations of the main modes of operation. Meticulous attention was paid to the energy recovery mechanism of the braking modes in which, electricity is fed back to the grid. The graphical representation of the results allows for a set of conclusions to be drawn about the trolleybus modes of power consumption and regenerative braking.
Reviewed thoroughly is the respective stop spacing, the road elevations and distinct characteristics of the trolleybus routes, reflecting the very impact of the infrastructure itself.
The experimental research studies were carried out under varied operating conditions taking into account all main modes of trolleybus operation – those of traction and braking. Examined further are the parameters designating their energy efficiency – specific and relative power consumption in mode of traction, recuperation efficiency, as well as the energy consumption for their own needs, air conditioning and heating. Thereupon, advanced, on the analysis of the measurement results obtained, are recommendations for improved energy efficiency of the vehicle operation.
Addressed specifically in the paper is the impact of the two-way power transmission via high voltage overhead power cables. Special measures are accordingly proposed, following the conclusions reached, as to a more stable supply of electric power.
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