Accurate online battery impedance measurement method with low output voltage ripples on power converters

Yao, Q; Lu, DDC; Lei, G

Accurate online battery impedance measurement method with low output voltage ripples on power converters

Yao, Q Lu, DDC Lei, G

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Publisher:: MDPI
Publication Type:: Journal Article
Citation:: Energies, 2021, 14, (4)
Issue Date:: 2021-02-02

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Field	Value	Language
dc.contributor.author	Yao, Q
dc.contributor.author	Lu, DDC
dc.contributor.author	Lei, G https://orcid.org/0000-0002-8369-6802
dc.date.accessioned	2022-03-09T04:31:17Z
dc.date.available	2022-03-09T04:31:17Z
dc.date.issued	2021-02-02
dc.identifier.citation	Energies, 2021, 14, (4)
dc.identifier.issn	1996-1073
dc.identifier.issn	1996-1073
dc.identifier.uri	http://hdl.handle.net/10453/155094
dc.description.abstract	The conventional online battery impedance measurement method works by perturbing the duty cycle of the DC-DC power converter and measuring the response of the battery voltage and current. This periodical duty cycle perturbation will continuously generate large voltage ripples at the output of power converters. These large ripples will not easily be removed due to the high amplitude and wide frequency range and would be a challenge to meet tight output regulation. To solve this problem, this paper presents a new online battery impedance measurement technique by inserting a small switched resistor circuit (SRC) into the converter. The first contribution of this work is that the perturbation source is moved from the main switch to the input-side of the converter, so the ripples are reduced. The analysis and experimental results of the proposed method show a reduction of 16-times compared with the conventional method. The second contribution tackles the possible change of the battery state of charge (SOC) during the online battery measurement process, which will inevitably influence the impedance measurement accuracy. In this proposed method, battery impedance at multiple frequencies can be measured simultaneously using only one perturbation to accelerate measurement speed and minimize possible SOC change. The experimental impedance results coincide with a high-accuracy laboratory battery impedance analyzer.
dc.language	English
dc.publisher	MDPI
dc.relation	http://purl.org/au-research/grants/arc/DP180100129
dc.relation.ispartof	Energies
dc.relation.isbasedon	10.3390/en14041064
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	02 Physical Sciences, 09 Engineering
dc.title	Accurate online battery impedance measurement method with low output voltage ripples on power converters
dc.type	Journal Article
utslib.citation.volume	14
utslib.for	02 Physical Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
utslib.copyright.status	open_access	*
dc.date.updated	2022-03-09T04:31:16Z
pubs.issue	4
pubs.publication-status	Published
pubs.volume	14
utslib.citation.issue	4

Abstract:

The conventional online battery impedance measurement method works by perturbing the duty cycle of the DC-DC power converter and measuring the response of the battery voltage and current. This periodical duty cycle perturbation will continuously generate large voltage ripples at the output of power converters. These large ripples will not easily be removed due to the high amplitude and wide frequency range and would be a challenge to meet tight output regulation. To solve this problem, this paper presents a new online battery impedance measurement technique by inserting a small switched resistor circuit (SRC) into the converter. The first contribution of this work is that the perturbation source is moved from the main switch to the input-side of the converter, so the ripples are reduced. The analysis and experimental results of the proposed method show a reduction of 16-times compared with the conventional method. The second contribution tackles the possible change of the battery state of charge (SOC) during the online battery measurement process, which will inevitably influence the impedance measurement accuracy. In this proposed method, battery impedance at multiple frequencies can be measured simultaneously using only one perturbation to accelerate measurement speed and minimize possible SOC change. The experimental impedance results coincide with a high-accuracy laboratory battery impedance analyzer.

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http://hdl.handle.net/10453/155094