Estimation of Traction Drive Test Bench with Energy Storage System Operation in Regenerative Braking Mode

Zaļeskis, Genadijs; Bražis, Viesturs; Latkovskis, Leonards

doi:10.2478/v10314-012-0007-y

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…Portable wheelchairs tend to be light and efficient -quite often with a small driving range. From the electrical perspective, some of the studied models had recuperative braking, which can increase energy efficacy -a feature that should be used in modern traction drives [28]. The models studied were sorted to form a group with performance parameters (range, weight) like the ones of the prototype and an average efficacy (E 1km ) value of 24 Wh/km was obtained, which is to be used for further battery pack calculations.…”

Section: Battery Packmentioning

confidence: 99%

Considerations regarding the concept of cost-effective power-assist wheelchair subsystems

Galkin

Podgornovs

Blinov

et al. 2018

Electrical, Control and Communication Engineering

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The present paper deals with the concept of a cost-effective power-assistant wheelchair. An analysis of the market situation and recent technical achievements is done at the beginning. On its basis, a set of solutions suitable for the development of such wheelchairs has been composed. It is shown that the key features of the considered concept are: segmented electrical motor and drive, sectioned battery pack, modular charger and an ANN matrix that provides easy and intuitive interfacing of sensor networks, pseudo-bionic feedbacks and the decision-making unit. Within the scope of the paper, a 3D model has been developed and 3D modelling has been conducted. As a result, certain drawbacks in the design and placement of elements have been found and a modification of the concept has been proposed

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Section: Battery Packmentioning

confidence: 99%

Considerations regarding the concept of cost-effective power-assist wheelchair subsystems

Galkin

Podgornovs

Blinov

et al. 2018

Electrical, Control and Communication Engineering

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“…An exemplary structure of the HESS system is shown in Fig. 1 [3]. Other HESS structures are described, for example, in [4].…”

Section: Energy Storage Systemsmentioning

confidence: 99%

Application of supercapacitors in electric traction storage systems

Lewandowski

Orzyłowski

Wieczorek

2018

MATEC Web of Conferences

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Abstract. Energy storage systems (ESS) are based on electrochemical batteries and supercapacitors (SC).SCs have a lower energy density compared to batteries, but have an advantage over them in power density. The combined use of the two in a hybrid ESS (HESS) gives both high energy density and high power density of ESSs. Fractional-order impedance describes the SC dynamics better than commonly used integer order impedance. Such a description can be based on the dielectric relaxation equations e.g. Cole-Cole equation used in this work. The paper compares results of the impedance approximation of a number of SC's with various fractional and integer models, on the basis of which the time responses are analysed. The methods of capacitance and ESR measurement recommended by the IEC standard are examined. They are compared with the methods used in practice by SC producers. The problem of energy losses in ESS with respect to charging/discharging current pulses is presented. A proper ESS designing requires an accurate approximation of the SC impedance over the frequency band in which the dominant part of the power spectrum of current pulses is located.

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“…In terms of the use of SCs in vehicular applications, there are a wealth of papers that consider the implementation of SCs as part of a hybrid system and have been used in conjunction with internal combustion engines (ICEs) [1], batteries [2][3][4][5][6][7][8] and fuel cells [9][10][11][12]. In most of these applications the SC has been utilised, at least in part, for regenerative braking purposes due to their excellent power density characteristics matching well with the regenerative braking characteristics.…”

Section: Introductionmentioning

confidence: 99%

The Role of Supercapacitors in Regenerative Braking Systems

Partridge

Abouelamaimen

2019

Energies

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A supercapacitor module was used as the energy storage system in a regenerative braking test rig to explore the opportunities and challenges of implementing supercapacitors for regenerative braking in an electric drivetrain. Supercapacitors are considered due to their excellent power density and cycling characteristics; however, the performance under regenerative braking conditions has not been well explored. Initially the characteristics of the supercapacitor module were tested, it is well known that the capacitance of a supercapacitor is highly dependent on the charge/discharge rate with a drop of up to 9% found here between the rated capacitance and the calculated value at a 100 A charge rate. It was found that the drop in capacitance was significantly reduced when a variable charge rate, representative of a regenerative braking test, was applied. It was also found that although supercapacitors have high power absorbing characteristics, the state-of-charge significantly impacts on the charging current and the power absorbing capacity of a supercapacitor-based regenerative braking system. This owed primarily to the current carrying capacity of the power electronic converters required to control the charge and discharge of the supercapacitor module and was found to be a fundamental limitation to the utilisation of supercapacitors in a regenerative braking system. In the worst cases this was found to impact upon the ability of the motor to apply the desired braking torque. Over the course of the tests carried out the overall efficiency was found to be up to 68%; however, the main source of loss was the motor. It was found that measurement of the state-of-charge using the rated capacitance significantly over-estimates the efficiency of the system.

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Estimation of Traction Drive Test Bench with Energy Storage System Operation in Regenerative Braking Mode

Cited by 9 publications

References 5 publications

Considerations regarding the concept of cost-effective power-assist wheelchair subsystems

Considerations regarding the concept of cost-effective power-assist wheelchair subsystems

Application of supercapacitors in electric traction storage systems

The Role of Supercapacitors in Regenerative Braking Systems

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