3.2 Cycle efficiency Cycle efficiency, also known as round-trip efficiency, is the ratio of the output electrical energy to the input electrical energy as a percentage during a full charge/discharge cycle. Therefore, it is a key indicator of energy efficiency. According to [], the cycle efficiency of ESSes can be classified into three levels: very high efficiency

DOI: 10.1109/TITS.2018.2789910 Corpus ID: 54210643 Energy-Efficient Train Timetable Optimization in the Subway System with Energy Storage Devices @article{Liu2018EnergyEfficientTT, title={Energy-Efficient Train Timetable Optimization in the Subway System with Energy Storage Devices}, author={Pei Liu and Lixing Yang

High power and energy density electrochemical energy storage devices are more important to reduce the dependency of fossil fuels and also required for the intermittent storage of renewable energy. Among various energy storage devices, carbon serves as a predominant choice of electrode material owing to abundance, electrical

In view of the current manual cleaning of the subway track, it requires more personnel, lower efficiency, and more capital needs. Therefore, a new method can be developed, which adopts a combination of a billboard and a cleaning device, so as to

Focusing on the energy-conservation train operation issues, this paper proposes an effective real-time train regulation scheme for metro systems with energy storage devices. Specifically, to minimize train timetable deviation, passenger waiting and energy consumption, we formulate a mixed-integer nonlinear programming model to

This new self-powered system collects wind energy in subway tunnels and converts it into electrical energy for storage and utilization. The system is

The energy storage device has been put into operation on many subway lines in Qingdao and Guangzhou. He told reporters that with the rapid growth of the total mileage of my country''s rail transit operations, the electricity consumption of the urban rail transit system has also increased year by year, and in 2019 it has accounted for 3‰ of the country''s

Model of subway railway generating equipment 4. Electric energy capture circuit design 4.1. Rectifier circuit design Because the voltage generated by vibration of piezoelectric materials on

Abstract: In this paper, a new energy storage system (ESS) is developed for an innovative subway without supply rail between two stations. The ESS is

This paper presents an analysis on using an on-board energy storage device (ESD) for enhancing braking energy re-use in electrified railway transportation. A simulation model was developed in the programming language C++ to help with the sizing of the ESD. The simulation model based on the mathematical description has been

Therefore, a new method can be developed, which adopts a combination of a billboard and a cleaning device, so as to satisfy the advertising efficiency, the garbage on the subway

In this paper, a new energy storage system (ESS) is developed for an innovative subway without supply rail between two stations. The ESS is composed of a supercapacitor bank and a braking resistor.

Subway Surfers is a classic endless runner game. You play as Jake, who surfs the subways and tries to escape from the grumpy Inspector and his dog. You''ll need to dodge trains, trams, obstacles, and more to go as far as you can in this endless running game. Collect coins to unlock power-ups and special gear to help you go further every time in

The progress of nanogenerator-based self-charging energy storage devices is summarized. The fabrication technologies of nanomaterials, device designs, working principles, self-charging performances, and the potential application fields of self-charging storage devices are presented and discussed. Some perspectives and

Hybrid energy storage systems composed of batteries and supercapacitors (SCs) can provide a stable and sustainable power source for wireless sensor network (WSN) nodes, where the energy management

This new self-powered system collects wind energy in subway tunnels and converts it into electrical energy for storage and utilization. The system is composed of

Self-discharge is an unwelcome phenomenon occurring in electrochemical energy storage devices, which leaks the stored energy while the device is in an idle state. Many factors including device configuration, different active components (electrode materials, electrolytes) and in-active components (binders, separators, current collectors,

Herein, the development of the self-charging energy storage devices is summarized. Focus will be on preparation of nanomaterials for Li-ion batteries and

In this paper, a new energy storage system (ESS) is developed for an innovative subway without supply rail between two stations. The ESS is composed of a supercapacitor bank and a braking resistor. An inversion-based control of the ESS is deduced from the Energetic Macroscopic Representation of the entire system. This

This paper reviews the application of energy storage devices used in railway systems for increasing the effectiveness of regenerative brakes. Three main storage devices are reviewed in this paper: batteries, supercapacitors and flywheels. Furthermore, two main challenges in application of energy storage systems are briefly discussed.

In this review, we focus on recent advances in energy-storage-device-integrated sensing systems for wearable electronics, including tactile sensors, temperature sensors, chemical and biological sensors, and multifunctional sensing systems, because of their universal utilization in the next generation of smart personal electronics.

One is operated with passive control modes, such as Regenerative Energy Devices (RED) and the other is operated with active control modes, such as Energy Storage Devices (ESD). Introducing them into one integrated power supply network in the metro system, a smart control module of the supply system should be well designed to

Development and Application of High-Efficiency Cleaning Device for Subway Based on Self-Generating Energy Storage System. March 2020. IOP

Flexible self-charging power sources harvest energy from the ambient environment and simultaneously charge energy-storage devices. This Review discusses different kinds of available energy devices

This facilitates polymeric gels to be used in energy storage devices due to their variable swelling behavior in response to environmental changes and self-healing capability. Since they are made of naturally occurring polymers like sugar and proteins, hydrogels resemble extracellular matrices and are recognised by cells where they seem

Smart and intelligent energy storage devices with self-protection and self-adaptation abilities aiming to address these challenges are being developed with great urgency. In this Progress Report, we highlight recent achievements in the field of smart energy storage systems that could early-detect incoming internal short circuits and self-protect against

This new stretchable device is portable, has a high operation potential (up to 1.8 V), a long life, high self-charging efficiency, and a high rate-capability. Its self-power conversion/storage efficiency is unprecedented at 13.3%. Additionally, an 89.34% retention capacity can be obtained after 100 cycles, and a surprisingly low-capacity decay

The paper deals with the actual theme of power management in traction systems presenting a study about the use of regenerative braking energy in electric subway transportation. Storage systems on board of the vehicles or on fixed plants can give advantages both to contain the costs of the electric power and to limit power losses along the traction line.

The evolution of energy storage devices for electric vehicles and hydrogen storage technologies in recent years is reported. a specific power of 75–300 W/kg, and a small self-discharge rate (0.1–0.3 %) about 2 % of

The paper suggests a control technique for improving energy saving in metropolitan trains equipped by energy storing devices. The most important feature of time scheduling of train''s movement in traction systems, is on time and satisfactory transportation of passengers, it can be shown that the consumed electrical energy could be optimized by

The booming wearable/portable electronic devices industry has stimulated the progress of supporting flexible energy storage devices. Excellent performance of flexible devices not only requires the component units of each device to maintain the original performance under external forces, but also demands the overall device to be

In this Review, we discuss various flexible self-charging technologies as power sources, including the combination of flexible solar cells, mechanical energy

This paper examines the reduction in the non-renewable power consumption of transport networks including core, metro and access layers when Video-on-Demand (VoD) content is cached in solar-powered fog data centres with Energy Storage Devices (ESDs). The effects of considering optical bypass routing and Mixed Line Rate

Biopolymers contain many hydrophilic functional groups such as -NH 2, -OH, -CONH-, -CONH 2 -, and -SO 3 H, which have high absorption affinity for polar solvent molecules and high salt solubility. Besides, biopolymers are nontoxic, renewable, and low-cost, exhibiting great potentials in wearable energy storage devices.

BEIJING, Sept. 30 (Xinhua) -- Chinese researchers have developed a ground hybrid energy storage device of supercapacitor and battery to save energy for subways,

Abstract The scheme of an operating subway combined traction substation is considered that indicates auxiliary consumers that require improved power supply. The features of the substation traction units operation and their possible effect on the power supply of essential auxiliary consumers are described. Voltage variations of

With this consideration, this paper particularly investigates a train timetable problem in a subway system, which is equipped with a series of energy storage devices at stations. A nonlinear integer programming model is formulated to maximize the utilization of regenerative braking energy.

This new self-powered system collects wind energy in subway tunnels and converts it into electrical energy for storage and utilization. The system is composed of three parts: electromagnetic wind energy acquisition module, piezoelectric wind energy acquisition module, and power generation energy storage module.

The objective of this research was to optimize the number of locations of the energy storage devices and speed profiles. First, kinematic equations were applied to simulate energy consumption. Then, a genetic algorithm (GA) was developed to optimize the speed profiles that minimize the energy consumption with and without a wayside