Modeling and Simulation of Regenerative Braking Energy in DC Electric Rail Systems

Abstract Increasing the utilization rate of regenerative braking energy in rail systems is one of the ongoing applications increasing in significance in recent years. This study develops a novelty algorithm within the scope of this objective and provides the calculation of the regenerative braking energy recovery rate and then making a decision for storage or back to grid of this energy. Afterwards, the regenerative braking energy was calculated with the help of this algorithm for Eskisehir-Ankara and Ankara-Eskisehir trips in two different passengers (load) scenarios, using the YHT 65000 high-speed train, which was chosen as a case study. Then, with a decision maker added to this classical regenerative braking energy algorithm, it will be decided whether this energy will be stored or forward back into the grid for the purpose of providing non-harmonic energy to the grid.

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Investigation on Realizing Fuel Rate Shaping Using a Common Rail Injector

Design, Application, Performance and Emissions of Modern Internal Combustion Engine Systems and Components ◽

10.1115/ices2003-0599 ◽

2003 ◽

Cited By ~ 3

Author(s):

Paolo Carlucci ◽

Antonio Ficarella ◽

Antonio Giuffrida ◽

Rosario Lanzafame

Keyword(s):

Modeling And Simulation ◽

Computer Modeling ◽

Injection Rate ◽

Common Rail ◽

Simulation Experiments ◽

The Real ◽

Rail Systems ◽

Rate Shaping ◽

Common Rail Injector ◽

Fuel Rate

The present work deals with the first researches into the real capabilities of an electronically controlled injector for common rail systems in realizing a proper shaping of the fuel rate with particular reference to its rising profile. Injectors equipped with standard and geometrically modified control valves have been investigated in detail by means of computer modeling and simulation. Experiments have been carried out in order to validate the feasibility of such a shaping and the injection rate meter based on the method proposed by Bosch was used. The main result of this work is a noteworthy dependence of the fuel rate on geometrical modifications in the piloting stage of the injector, since a certain difference in the slope of the first part of the fuel rate has been attained. The injector model has been finally used to investigate further geometrical modifications to be realized in order to achieve the desired fuel rate shaping.

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Modeling and Simulation of Regenerative Braking Rectifier for Electric Vehicle

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.602-605.2832 ◽

2014 ◽

Vol 602-605 ◽

pp. 2832-2835

Author(s):

Mei Lan Zhou ◽

Ge Hang Su ◽

Jia Bin Wen

Keyword(s):

Modeling And Simulation ◽

Electric Vehicle ◽

Simulation Experiment ◽

Regenerative Braking ◽

Energy Transformation ◽

Voltage Fluctuation ◽

Voltage Fluctuations ◽

Dc Voltage ◽

Working Status ◽

Low Efficiency

Aiming at the problem of low efficiency of recycling energy in the process of regenerative braking for electric vehicle, SVPWM algorithm is applied to the process of energy transformation of regenerative braking in this paper. It is derived and verified that, through using SVPWM, DC voltage fluctuation can be reduced in the process of rectification. The simulation model is built basing on the Volkswagen LAVIDA EV. The simulation experiment was carried out combining with the actual working status of electric vehicle regenerative braking. The simulation experimental results prove that DC voltage fluctuations can be decreased and the efficiency of regenerative braking rectifier can be increased through SVPWM. The following feature of rectifier in the braking condition is good.

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Parameters Affecting Braking Energy Recuperation Rate in DC Rail Transit

ASME/IEEE 2007 Joint Rail Conference and Internal Combustion Engine Division Spring Technical Conference ◽

10.1115/jrc/ice2007-40023 ◽

2007 ◽

Cited By ~ 1

Author(s):

Su¨leyman Ac¸ikbas¸ ◽

M. Turan So¨ylemez

Keyword(s):

Energy Consumption ◽

Considerable Effect ◽

Regenerative Braking ◽

Rail Transit ◽

Transit Systems ◽

Energy Recuperation ◽

Acceleration Rate ◽

Rail Systems ◽

World Energy ◽

Train Operation

Rail systems are well-known for their energy efficiency. Energy resources used in mass rail transit systems is predominantly electricity around the world. Energy consumption of a wide mass rail transit network operator in a city can easily be the biggest electricity consumer of the city. Therefore, it is very important that the efficiency is increased. This is also an essential requirement for sustainable development. Some trains used in mass transit systems are equipped with regenerative braking. This allows trains to brake in regenerative mode and feed the other trains on the line, if there is a demand. Researches showed that up to 40% of the total traction energy consumption could be supplied by this regenerative braking energy, if it is 100% used. This usage rate depends on many different parameters such as train operation frequency (headway), train-set auxilary power consumption rate, nominal braking acceleration rate, braking effort vs. velocity curve of trains. Power system configuration such as substation locations and distances, catenary system resistance, and nominal power feeding voltage level has also considerable effect on recuperation rate. In the paper, some of these parameters’ impacts will be examined with the help of a multi-train, multi-line DC rail system simulator. The results will be given in comparison tables and discussed. Lastly, new emerging technologies such as flywheels and super capacitors to capture the un-used braking energy will be briefly given.

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