A new duty cycle based efficiency estimation method for a supercapacitor stack under constant power operation

Kulsangcharoen, Ponggorn; Klumpner, Christian; Rashed, Mohamed; Asher, G.M.

doi:10.1049/cp.2010.0117

Cited by 12 publications

(15 citation statements)

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“…This work has been previously reported in [5]. During that test, the efficiency of the device was calculated by (7)- (8): (7) and (8) where and…”

Section: Evaluation Under the Constant Power Testmentioning

confidence: 95%

“…Detailed results of the constant power tests performed in two situations, with forced (all cells ran cooler and at same temperature) and natural cooling (devices in the middle of the stack ran significantly hotter than the ones at the edge, as revealed by thermal imaging [5]), are provided in Table V. In addition to the results published in [5], where only an average ESR was considered, here, there analytical efficiencies were estimated based on the analytical model (8) that used the equivalent ESR of the cells as revealed by the real term of the complex impedance read at the actual charge discharge cycle frequency using the data from the equivalent models derived from the three investigated methods: the pulse response, the EIS with 10V bias and the EIS with no bias. …”

Section: Evaluation Under the Constant Power Testmentioning

confidence: 99%

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Characterization of energy storage devices for constant power applications

Kulsangcharoen

Klumpner

Rashed

et al. 2010

IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society

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Abstract-In this paper, a few known characterization techniques for supercapacitors have been evaluated with the purpose of being able to predict the roundtrip efficiency of an energy storage system under constant power application. It is found that the user cannot rely on a single characterization method since the methods based on small signal disturbance are not very precise when the model is subjected to large signal variations. Also, methods based on large signal disturbance will not be very precise when subjected to small signal tests. By comparing the analytically estimated constant power round trip efficiency with experimental data, it is concluded that both models can give acceptable accuracy if a relevant DC bias is used.

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“…This work has been previously reported in [5]. During that test, the efficiency of the device was calculated by (7)- (8): (7) and (8) where and…”

Section: Evaluation Under the Constant Power Testmentioning

confidence: 95%

Section: Evaluation Under the Constant Power Testmentioning

confidence: 99%

Characterization of energy storage devices for constant power applications

Kulsangcharoen

Klumpner

Rashed

et al. 2010

IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society

Self Cite

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show abstract

“…The constant power cycling (CPC) method is originally used in aging tests [4,5,8,9] to study SC degradation. The authors have adopted this method for evaluating the SC round-trip efficiency and loss [8] based on direct measurement of SC power in and power out, allowing the direct measurement of energies in and out and direct calculation of the energy loss over a cycle.…”

Section: Estimating the Power Losses Under Constant Power Cycling Metmentioning

confidence: 99%

“…For the small-signal approach, the SC impedance versus frequency is first determined using the electrochemical impedance spectroscopy technique. Then the SC impedance information can be used to determine the SC detailed equivalent models [1,6] and/or used directly to estimate SC power loss and efficiency [3,7,8]. For the large-signal approach, high current/power is applied to SCs directly in charge-discharge cycling pattern [6] and by calculating the SC in&out energy over a single charge-discharge cycle, SC efficiency and energy loss can be determined.…”

Section: Introductionmentioning

confidence: 99%

“…To validate a given SC model, two independent approaches are usually employed and their results are cross evaluated for consistency. In [7,8], the SC efficiency and energy loss is estimated from the SC voltage obtained during the charge-discharge cycling test and the SC impedance from the EIS test. However, this method cannot determine SC energy loss precisely (>10-20% overestimate) since its formula is limited to use of a single set of RC parameter that correspond to the frequency of the charge-discharge cycling period.…”

Section: Introductionmentioning

confidence: 99%

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Assessing the accuracy of loss estimation methods for supercapacitor energy storage devices operating under constant power cycling

Kulsangcharoen

Klumpner

Rashed

et al. 2014

2014 16th European Conference on Power Electronics and Applications

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk AbstractThis paper assesses different energy loss estimation methods using the supercapacitor model parameters extracted from the electrochemical impedance spectroscopy (EIS). Two energy loss estimation methods are applied to two similar supercapacitors from different manufacturers operating under constant power charge-discharge cycling. The simpler loss method uses only the impedance data that corresponds to the cycle frequency and the instantaneous current data whilst the more complex method uses the detailed impedance vs frequency dependency and the corresponding current harmonics available from the FFT. The experimental loss data (the benchmark) uses integration of instantaneous power processed by the supercapacitor. By comparing the difference between the estimated and the experimental losses, the performance of each method is assessed and the factors that influence the accuracy of the two loss estimation methods as well as their limitations are highlighted.

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A review on characterization of supercapacitors and its efficiency analysis for different charging methods and applications

et al. 2022

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The dependence on renewable energy to solve the major energy issues related to global warming and shortage of energy resources is increasing drastically. This has led to high level awareness of proper energy storage and management. In this regard, supercapacitors have evolved as an efficient energy storage solution and hence successfully employed in several applications. This is attributed to its high-power density, superior performance, and extended maintenance-free lifetime. Also, it is known for low equivalent series resistance, that means, only a small amount of energy is lost while its charging/ discharging even at high current. As a result, it has developed a lot of inquisitiveness among the research community of recent past for further exploration of different aspects of supercapacitors, ranging from material science, modeling and characterizations, engineering applications, and so forth. This review article aims at putting forth an exclusive study of their characterization of supercapacitor for different charging methods and applications. Further, the prime focus is given to the efficiency estimation of supercapacitors which is very essential as it denotes the amount of energy loss or the utilizable state of charge. The analysis has been carried out based on different charging methods and applications, which is essential for improving overall system reliability and performance. The purpose is to organize all important research carried out in this domain till date and to stimulate further insights for effective energy storage and management.

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A new duty cycle based efficiency estimation method for a supercapacitor stack under constant power operation

Cited by 12 publications

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Characterization of energy storage devices for constant power applications

Characterization of energy storage devices for constant power applications

Assessing the accuracy of loss estimation methods for supercapacitor energy storage devices operating under constant power cycling

A review on characterization of supercapacitors and its efficiency analysis for different charging methods and applications

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