A study on super capacitor wayside connection for energy recuperation in electric rail systems

Khodaparastan, Mahdiyeh; Mohamed, Azah

doi:10.1109/pesgm.2017.8273915

Cited by 13 publications

(10 citation statements)

References 16 publications

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“…Considering the results of energy consumption/saving potential calculations in Table 2, it seems that a significant percentage of the braking energy can be recovered, that is, up to 24% of daily energy consumption (particularly under heavy traffic conditions, where the number of decelerations increases significantly). These outcomes are in line with results regarding regenerative energy savings found in literature [27][28][29].…”

Section: Energy Consumption/saving Potential Estimations For a Typicasupporting

confidence: 91%

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

Apostolidou

Papanikolaou

2018

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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.

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Section: Energy Consumption/saving Potential Estimations For a Typicasupporting

confidence: 91%

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

Apostolidou

Papanikolaou

2018

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“…SCs, due to their high power density, are used in applications that require high peak power in a short period of time with frequent charge and discharge cycles [20][21][22][23]. Despite its high-performance parameters, application of SCs in a rail transportation system should be monitored carefully to prevent accelerated ageing.…”

Section: Supercapacitor Energy Storage System (Scess)mentioning

confidence: 99%

“…A basic cost-benefit analysis has been performed by using (22), (23), and (26), to estimate a payback period for the installed storage technologies. This evaluation considers the capital and operating costs of the ESSs to be the expenses incurred over the cost saving in terms of energy and peak power, to obtain an approximate time after which a return on investment can be expected.…”

Section: Payback Time Estimationmentioning

confidence: 99%

A Dual-Stage Modeling and Optimization Framework for Wayside Energy Storage in Electric Rail Transit Systems

et al. 2020

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In this paper, a dual-stage modeling and optimization framework has been developed to obtain an optimal combination and size of wayside energy storage systems (WESSs) for application in DC rail transportation. Energy storage technologies may consist of a standalone battery, a standalone supercapacitor, a standalone flywheel, or a combination of these. Results from the dual-stage modeling and optimization process have been utilized for deducing an application-specific composition of type and size of the WESSs. These applications consist of different percentages of energy saving due to regenerative braking, voltage regulation, peak demand reduction, estimated payback period, and system resiliency. In the first stage, sizes of the ESSs have been estimated using developed detailed mathematical models, and optimized using the Genetic Algorithm (GA). In the second stage, the respective sizes of ESSs are simulated by developing an all-inclusive model of the transit system, ESS and ESS management system (EMS) in MATLAB/Simulink. The mathematical modeling provides initial recommendations for the sizes from a large search space. However, the dynamic simulation contributes to the optimization by highlighting the transit system constraints and practical limitations of ESSs, which impose bounds on the maximum energy that can be captured from decelerating trains.

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“…To connect SESS to the third rail, a bidirectional DC/DC converter was used. The schematic and the control circuit of this converter are presented in Figure 9 [16]. The supercapacitor was modeled by a controlled voltage source, as presented in Figure 8.…”

Section: System Under Studymentioning

confidence: 99%

Flywheel vs. Supercapacitor as Wayside Energy Storage for Electric Rail Transit Systems

Khodaparastan

Mohamed

2019

Inventions

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Energy storage technologies are developing rapidly, and their application in different industrial sectors is increasing considerably. Electric rail transit systems use energy storage for different applications, including peak demand reduction, voltage regulation, and energy saving through recuperating regenerative braking energy. In this paper, a comprehensive review of supercapacitors and flywheels is presented. Both are compared based on their general characteristics and performances, with a focus on their roles in electric transit systems when used for energy saving, peak demand reduction, and voltage regulation. A cost analysis is also included to provide initial guidelines on the selection of the appropriate technology for a given transit system.

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A study on super capacitor wayside connection for energy recuperation in electric rail systems

Cited by 13 publications

References 16 publications

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

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

A Dual-Stage Modeling and Optimization Framework for Wayside Energy Storage in Electric Rail Transit Systems

Flywheel vs. Supercapacitor as Wayside Energy Storage for Electric Rail Transit Systems

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