Next Article in Journal
Implications of Land-Grabbing on the Ecological Balance of Brazil
Previous Article in Journal
Agent-Based Model for End-of-Life Product Flow Analysis
Article Menu
Issue 3 (September) cover image

Export Article

Open AccessFeature PaperArticle
Resources 2018, 7(3), 43; https://doi.org/10.3390/resources7030043

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

Department of Electrical & Computer Engineering, Democritus University of Thrace, 67132 Xanthi, Greece
*
Author to whom correspondence should be addressed.
Received: 23 June 2018 / Revised: 13 July 2018 / Accepted: 19 July 2018 / Published: 22 July 2018
Full-Text   |   PDF [7609 KB, uploaded 22 July 2018]   |  

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. View Full-Text
Keywords: asynchronous machine; direct vector control; direct torque control; hybrid energy storage systems; regenerative braking; trolleybus energy consumption asynchronous machine; direct vector control; direct torque control; hybrid energy storage systems; regenerative braking; trolleybus energy consumption
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Apostolidou, N.; Papanikolaou, N. Energy Saving Estimation of Athens Trolleybuses Considering Regenerative Braking and Improved Control Scheme. Resources 2018, 7, 43.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Resources EISSN 2079-9276 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top