Optimized configuration and economic evaluation of on-board energy storage system for subway vehicles
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ORIGINAL PAPER
Optimized configuration and economic evaluation of on-board energy storage system for subway vehicles Jianpu Wang1
· Chenglong Ren1 · Sufang Zhao1 · Liqing Nie1 · Yu Zhuang2 · Lei Hong1
Received: 13 July 2020 / Accepted: 30 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The on-board supercapacitor energy storage system for subway vehicles is used to absorb vehicles braking energy. Because operating voltage, maximum braking current and discharge depth of supercapacitor have a great influence on its rational configuration, there are theoretical optimum values based on the analysis of vehicle regenerative braking theory, whose mathematical models for the supercapacitor bank power and capacity requirements are established. To meet braking energy recovery, constrained configuration method is based on the power, capacity and discharge depth of the supercapacitor bank. The supercapacitor bank optimization process is given, and then the effect of operating voltage and temperature on the life of supercapacitor is analyzed from the view of economy. Calculation models of initial investment, operation–maintenance cost and economic benefit of the system are given. The simulation results show that the supercapacitor bank based on power, capacity and discharge depth can meet the requirement of braking energy recovery for subway vehicles. Meanwhile, the economic evaluation of the project shows that the project will achieve good social and economic benefits. Keywords Subway vehicle · Supercapacitor · On-board energy storage · Life · Economic evaluation
1 Introduction The energy consumption of the vehicle operation is more than 50% of the whole system energy consumption in the subway transportation system [1–3]. Reducing the vehicle operation energy consumption directly affects the sustainable development of the subway transportation industry [4–7]. The
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Jianpu Wang [email protected] Chenglong Ren [email protected] Sufang Zhao [email protected] Liqing Nie [email protected] Yu Zhuang [email protected] Lei Hong [email protected]
1
School of Automotive & Rail Transit, Nanjing Institute of Technology, Nanjing 211167, China
2
The Second Operation Branch, Suzhou Rail Transit Group Limited Company, Suzhou 215004, China
running characteristic of subway vehicles is frequently starting and stopping. When the vehicle is in traction condition during operation, the electric energy of the traction network will be converted into kinetic energy of the vehicle through the traction motor. When the vehicle is in braking condition during operation, according to the energy conservation, the vehicle’s kinetic energy is converted into electricity by a traction motor and fed back into the DC1500V or DC750V traction network, and most of this energy will cause the DC network voltage to rise or dissipate in the resistor as heat. The regenerative braking has been widely used in subway vehicles, which has made a great contribution to saving energy and improving environment in recent years [
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