Parameters Affecting Braking Energy Recuperation Rate in DC Rail Transit

2007 ◽  
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.

scholarly journals Recuperation of Regenerative Braking Energy in Electric Rail Transit Systems

2019 ◽  
Vol 20 (8) ◽  
pp. 2831-2847 ◽  
Author(s):  
Mahdiyeh Khodaparastan ◽  
Ahmed A. Mohamed ◽  
Werner Brandauer
Keyword(s):  
Regenerative Braking ◽  
Rail Transit ◽  
Transit Systems

scholarly journals A regenerative braking energy recuperation from elevator operation in building by active rectifier

2021 ◽  
Vol 12 (2) ◽  
pp. 811
Author(s):  
An Thi Hoai Thu Anh ◽  
Luong Huynh Duc
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Urban Area ◽  
Regenerative Braking ◽  
High Rise ◽  
Active Rectifier ◽  
Energy Recuperation ◽  
Grid Simulation ◽  
Simulation Results ◽  
Active Rectifiers

Elevators- means of vertical transportation to carry people and goods are an indispensable part in offices, high-rise buildings, hospitals, commercial areas, hotels, car-parks when blooming urbanization develops worldwide. However, the level of energy consumption in elevator operation is significant, so energy saving solutions have been outlined and applied in practice. With frequent braking phases, regenerative braking energy is wasted on braking resistors. Therefore, this paper proposes regenerative braking energy recuperation method for elevator operation in building by active rectifiers enabling the braking energy to be fed back into utility grid. Simulation results conducted by MATLAB with data collected from OCT5B building-RESCO new urban area, Ha noi, Vietnam have verified saving energy of using active rectifiers replacing diode rectifiers up to 33%.

scholarly journals Application of Regenerative Braking with Optimized Speed Profiles for Sustainable Train Operation

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Leon Allen ◽  
Steven Chien
Keyword(s):  
Energy Saving ◽  
Travel Time ◽  
Transmission Lines ◽  
Urban Rail Transit ◽  
Regenerative Braking ◽  
Rail Transit ◽  
Time Step ◽  
Urban Rail ◽  
Train Operation ◽  
Storage Limit

This paper presents a method for synergizing the energy-saving strategies of integrated coasting and regenerative braking in urban rail transit operations. Coasting saves energy by maintaining motion with propulsion disabled, but it induces longer travel time. Regenerative braking captures and reuses the braking energy of the train and could shorten travel time but reduces the time available for coasting, indicating a tradeoff between the two strategies. A simulation model was developed based on fundamental kinematic equations for assessing sustainable train operation with Wayside Energy-Saving Systems (WESSs). The objective of this study is to optimize speed profiles that minimize energy consumption, considering the train schedule and specifications, track alignment, speed limit, and the WESS parameters such as storage limit and energy losses in the transmission lines. The decision variables are the acceleration at each time step of the respective motion regimes. Since the study optimization problem is combinatorial, a Genetic Algorithm was developed to search for the solution. A case study was conducted which examined various scenarios with and without WESS on a segment of an urban rail transit line to test the applicability of the proposed model and to provide a platform for the application of ideas developed in this study. It was determined that synergizing the energy-saving strategies of coasting and regenerative braking yielded the greatest efficiency of the scenarios examined.

scholarly journals Survey on Driverless Train Operation for Urban Rail Transit Systems

2016 ◽  
Vol 2 (3-4) ◽  
pp. 106-113 ◽  
Author(s):  
Yihui Wang ◽  
Miao Zhang ◽  
Jiaqi Ma ◽  
Xuesong Zhou
Keyword(s):  
Urban Rail Transit ◽  
Rail Transit ◽  
Transit Systems ◽  
Urban Rail ◽  
Train Operation

scholarly journals Speed profile optimization of an electrified train in Cat Linh-Ha Dong metro line based on pontryagin's maximum principle

2020 ◽  
Vol 10 (1) ◽  
pp. 233 ◽  
Author(s):  
An Thi Hoai Thu Anh ◽  
Nguyen Van Quyen ◽  
Nguyen Thanh Hai ◽  
Nguyen Van Lien ◽  
Vu Hoang Phuong
Keyword(s):  
Energy Consumption ◽  
Maximum Principle ◽  
Energy Efficient ◽  
Pontryagin’S Maximum Principle ◽  
Regenerative Braking ◽  
Speed Profile ◽  
Pontryagin's Maximum Principle ◽  
Efficient Operation ◽  
Train Operation ◽  
Profile Optimization

An urban railway is a complex technical system that consumes large amounts of energy, but this means of transportation still has been obtained more and more popularity in densely populated cities because of its features of high-capacity transportation capability, high speed, security, punctuality, lower emission, reduction of traffic congestion. The improved energy consumption and environment are two of the main objectives for future transportation. Electrified trains can meet these objectives by the recuperation and reuse of regenerative braking energy and by the energy - efficient operation. Two methods are to enhance energy efficiency: one is to improve technology (e.g., using energy storage system, reversible or active substations to recuperate regenerative braking energy, replacing traction electric motors  by energy-efficient traction system as permanent magnet electrical motors; train's mass reduction by lightweight material mass...); the other is to improve operational procedures (e.g. energy efficient driving including: eco-driving; speed profile optimization; Driving Advice System (DAS); Automatic Train Operation (ATO); traffic management optimization...). Among a lot of above solutions for saving energy, which one is suitable for current conditions of metro lines in Vietnam. The paper proposes the optimization method based on Pontryagin's Maximum Principle (PMP) to find the optimal speed profile for electrified train of Cat Linh-Ha Dong metro line, Vietnam in an effort to minimize the train operation energy consumption.

Rail Transit in the Next Millennium: Some Global Perspectives

2000 ◽  
Vol 1704 (1) ◽  
pp. 3-9 ◽  
Author(s):  
Herbert S. Levinson
Keyword(s):  
Soviet Union ◽  
Urban Areas ◽  
Former Soviet Union ◽  
The United States ◽  
Light Rail ◽  
Rail Transit ◽  
Transit Systems ◽  
Global Perspectives ◽  
Rail Systems ◽  
Per Capita

Worldwide rail transit is discussed, focusing on grade-separated metro and light rail systems. Systems are compared by continent and country, number of lines per urban area, line lengths, station spacing, rail kilometers per million persons, annual rides per capita, and riders per route kilometer. Nine countries—the United States, the former Soviet Union, Germany, Japan, France, China, Brazil, the United Kingdom, and Canada—account for 68 percent of all rail transit systems. Ridership per capita is generally lowest in North America and highest on systems in the former Soviet Union. Europe has the largest number of systems, the most rail kilometers per million persons, and the third highest level in annual rides per capita. Comparisons and trends suggest a need for additional rail transit in the next millennium, as urban areas throughout the world continue to grow.

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