Energy Saving Estimation of Athens Trolleybuses Considering Regenerative Braking and Improved Control Scheme

Nena Apostolidou and Nick Papanikolaou
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Nena Apostolidou: Department of Electrical & Computer Engineering, Democritus University of Thrace, 67132 Xanthi, Greece
Nick Papanikolaou: Department of Electrical & Computer Engineering, Democritus University of Thrace, 67132 Xanthi, Greece

Resources, 2018, vol. 7, issue 3, 1-18

Abstract: In this work, the electromechanical system of the 8000-series of Athens trolleybuses, based on data provided by OSY S.A., is analyzed. Those data were used to develop a valid model in order to estimate the total energy consumption of the vehicle under any possible operating conditions. In addition, an effort is made to estimate the energy saving potential if the wasted energy—in the form of heat—during braking or downhill courses is recovered (regenerative braking) and retrofitted during normal operation. This process requires the installation of appropriate electrical apparatus to recover and temporarily store this energy amount. Moreover, due to the fact that the main engine of the system is an asynchronous electric machine, its driving scheme is also of interest. This study assumes the current driving scheme, that is the direct vector control (DVC), and proposes an alternative control method, the direct torque control (DTC). Energy consumption/saving calculations highlight the effectiveness of incorporating regenerative braking infrastructure in trolleybuses transportation systems. Finally, a sustainable hybrid energy storage unit that supports regenerative braking is proposed.

Keywords: asynchronous machine; direct vector control; direct torque control; hybrid energy storage systems; regenerative braking; trolleybus energy consumption (search for similar items in EconPapers)
JEL-codes: Q1 Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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