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It is energy-efficient and grid-friendly to utilize regenerative braking energy (RBE) in electrified railways. However, considering the segmented structure of the railway power
The cost of electricity consumed by EVs is less than the cost of petrol or diesel because of the high efficiency of electrical machines (EM); on average, EVs convert 70–80% of the
manage the braking and acceleration energy without using the extra energy storage device, and charging rate is considered to be at least 20 kW, which
The railway power conditioner-based energy storage system (RPC-based ESS) is a promising technology to improve the regenerative braking energy (RBE) utilization and power quality of AC direct-fed
In order to absorb the regenerative braking energy of trains, supercapacitor energy storage systems (ESS) are widely used in subways. Although wayside ESS are widely used, because of the influence of no-load voltage, and so on, a wayside ESS cannot absorb all the regenerative braking energy in some special cases,
In this paper, the supercapacitor energy storage system is used to recover regenerative braking energy of elevators when they operate down full-load and up no-load, reducing fluctuation of voltage
Abstract Read online Regenerative braking energy (RBE) will be generated when high-speed train is in braking state, but the utilization rate of RBE is generally low. To solve this problem, based on the hybrid energy storage system (HESS), a scheme for energy
Regenerative braking plays an important role in improving the driving range of electric vehicles. To achieve accurate and efficient braking deceleration control, this research focuses on energy recovery process with ultracapacitor (UC). According to the statistical analysis results of the characteristics for typical operation, a multi-step series
In case of electric trains, the excess energy of vehicle regenerative braking is mostly wasted as heat. Instead of an instantaneous waste, a later re-use of this energy requests the adoption of an
Electric trains generally have four modes of operation including acceleration, cruising, coasting, and braking. There are several types of train braking systems, including regenerative braking, resistive braking and air braking. Regenerative braking energy can be effectively recuperated using wayside energy storage, reversible substations, or
The practical applicability of a high-power graphene supercapacitor as an effective primary and auxiliary energy storage system for storing regenerative energy from the braking and deceleration process in electric vehicles (EVs) is studied. DOI: 10.1039/d1qm00465d
With the increasing scale of urban rail transit, the energy waste cause at a train''s electric braking has been also growing. Usage of an on-board energy storage device [60, 61] provides an
Innovations in electric vehicle technology have led to a need for maximum energy storage in the energy source to provide some extra kilometers. The size of electric vehicles limits the size of the batteries, thus limiting the amount of energy that can be stored. Range anxiety amongst the crowd prevents the entire population from shifting to a
With increasing global attention to climate change and environmental sustainability, the sustainable development of the automotive industry has become an important issue. This study focuses on the regenerative braking issues in pure electric vehicles. Specifically, it intends to elucidate the influence of the braking force distribution
Abstract: The main aim of this project is to develop a hybrid energy storage system employing regenerative braking and vibration-powered energy for a hybrid electric
Fig. 2 shows the model of battery and ultracapacitor. According to Fig. 2 (a) and (b), the ultracapacitor can be equivalent to three parts of ideal capacitor C, series resistance R s and large resistance leakage resistor R p.Among them, R p determines the long-term storage performance of the ultracapacitor, and R s is very small under normal
Braking energy recovery is a key technology for improving energy efficiency and extending the driving range of electric vehicles. However, there are challenges for
Nowadays, the development of urban rail transit is getting faster and faster, but its consequent electric consumption problem is getting more attention, and how to better solve the problem of regenerative braking energy absorption and
A novel energy model of the battery-flywheel system is established. • The current distribution and torque allocation are realized by energy optimization. • The proposed double NNs-based control method improves the motor speed regulation. •
The paper presents a regenerative braking energy recovery system based on super-capacitor energy storage system. When electric trains operate in accelerating or braking regimes, the voltage of DC bus will fluctuatesharply to compare
In this paper, Spearman''s correlation coefficient is used as an indicator of similarity. The more the Spearman value tends to 1, the more similar the pattern is. Fig. 6 shows the Spearman correlation coefficients of the correlation patterns between driving style characteristics and energy consumption for different sample sizes under three different
To ensure that regenerative braking energy is fully utilized by traction trains in a whole railway line, based on the power regulation scheme in [33] and [34], an effective utilization scheme
The problem of optimally sizing hybrid energy storage systems (HESS) installed in electric railway systems, considering the effect of regenerative braking is studied in this paper. HESSs combine traditional batteries and newly developed ultracapacitors, taking advantage of the high energy capacity of batteries and of the
Energy Technology is an applied energy journal covering technical aspects of energy process engineering, including generation, conversion, storage, & distribution. Braking energy recovery is a key technology for improving energy efficiency and extending the driving range of electric vehicles.
In addition, the RBS control mechanism could achieve uniform braking force distribution between the front and rear wheels of the vehicle. Furthermore, our findings revealed that the experimental HSC/battery RBS program enhanced the harvesting of the regenerative braking energy, as was evident from the longer driving distance vis-à-vis
The paper presents a regenerative braking energy recovery system based on super-capacitor energy storage system. When electric trains operate in accelerating or braking regimes, the voltage of DC
Taking the recovered braking energy of the system as an objective, an energy optimization method based on GA is proposed to obtain the optimal electric
Zhong, Z. [32] proposes SCs as an on-board storage system to absorb braking energy and completely replace the brake resitor (see Figure 7). Despite the weight that this implies
RBSs can be classified based on employed energy storage system and control system. •. RBSs improve fuel economy, performance, and reduce emissions and
considering a power or energy limit to the regenerative braking, that is, all the energy fr om the brakes can be recovered. Energies 2020, 12, x FOR PEER REVIEW 10 of 17
A regenerative brake. [1] Regenerative braking systems (RBSs) are a type of kinetic energy recovery system that transfers the kinetic energy of an object in motion into potential or stored energy to slow the vehicle down,
Optimization and control of battery-flywheel compound energy storage system during an electric vehicle braking Wei Wang, Yan Li, Man Shi and Yuling Song Energy, 2021, vol. 226, issue C Abstract: Combining the advantages of battery''s high specific energy and flywheel system''s high specific power, synthetically considering the effects of non-linear
With the development of electric vehicles, their economy has become one of the research hotspots. A braking energy recovery system for electric vehicles based on flywheel energy storage was designed, and a vehicle economy model for flywheel energy storage was established on the Cruise platform. A control strategy for the flywheel braking recovery
Regenerative/energy braking is dependent on the operation of ABS. For instance, if a braking situation requires ABS intervention, then RBS operation is halted and the controller resorts to friction brakes. An RBS using an intelligent controller, however, is not limited to ABS intervention.
On the other hand, the kinetic energy can be turned into heat energy being dissipated via mechanical friction during braking, which sometimes accounts for about 50% on average of the all effective
This paper proposes a methodology for optimal operation of railway electric energy systems considering renewable energy sources (PV panels and wind turbines), regenerative braking capabilities and hybrid electric energy storage systems (ultracapacitors and batteries). The uncertainties associated to renewable energies are
Energy storage units will be considered for all-electric ranges of 10, 20, 30, 40, 50, and 60 miles. The acceleration performance of all the vehicles will be the same (0–60 mph in 8–9 s). For the batteries, the useable depth of
When no braking power is available, energy is transferred from the supercaps (peak) storage to the batteries (base) storage. A MetroHESS efficiency of 90% in terms of discharged vs. charged energy is estimated, along
Index Terms— Onboard energy storage, regenerative braking, reversible substation, wayside energy storage. I. INTRODUCTION Increasing the overall efficiency of electric rail transit systems is critical to achieve energy saving, and greenhouse gas (GHG) emission reduction [1], [2]. In general, electric train operation can be divided into four
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