Distributed Secondary Control of Energy Storage Units for SoC balancing in AC Microgrid

Begum, M; Li, L; Zhu, J

Distributed Secondary Control of Energy Storage Units for SoC balancing in AC Microgrid

Begum, M Li, L

Zhu, J

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Publisher:: IEEE
Publication Type:: Conference Proceeding
Citation:: 2020 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT), 2020, 00, pp. 1-5
Issue Date:: 2020-05-07

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Field	Value	Language
dc.contributor.author	Begum, M
dc.contributor.author	Li, L https://orcid.org/0000-0001-8485-2216
dc.contributor.author	Zhu, J https://orcid.org/0000-0002-9763-4047
dc.date	2020-02-17
dc.date.accessioned	2021-02-26T16:55:46Z
dc.date.available	2021-02-26T16:55:46Z
dc.date.issued	2020-05-07
dc.identifier.citation	2020 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT), 2020, 00, pp. 1-5
dc.identifier.isbn	978-1-7281-3104-7
dc.identifier.issn	2167-9665
dc.identifier.uri	http://hdl.handle.net/10453/146492
dc.description.abstract	This paper introduces a new distributed secondary control (DSC) method for distributed energy storage units (DESUs) in an islanded alternative current (AC) microgrid (MG). Dynamics of distributed storages for the extended time duration are not taken into account in the traditional hierarchical control of MG. Thus, it is challenging to control the DESUs with various levels of stored energy represented by the state of charge (SoC). The storage units can utilise their full power capacity after converging to a common SoC to mitigate the generation and demand variations in the MG. SoC depletion of DESUs with lower initial SoC occurs faster than those with higher initial SoC by using the traditional P-f droop control and then their capacities are no longer accessible. Furthermore, applying the droop control to match the SoC of DESUs causes the deviation of frequency and voltage from their reference values. However, restoration of the MG frequency using the conventional DSCs disrupts the SoC-balancing. The designed DSC can achieve simultaneous frequency/voltage regulation, power sharing and SoC-balancing as well as removing the centralized communication. The proposed method is evaluated in the established Matlab/Simulink model and the results validate the effectiveness of the proposed method.
dc.language	en
dc.publisher	IEEE
dc.relation.ispartof	2020 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT)
dc.relation.ispartof	2020 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference
dc.relation.isbasedon	10.1109/isgt45199.2020.9087774
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.rights	© 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.	en_US
dc.title	Distributed Secondary Control of Energy Storage Units for SoC balancing in AC Microgrid
dc.type	Conference Proceeding
utslib.citation.volume	00
utslib.location.activity	Washington, DC, USA
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	open_access	*
utslib.copyright.embargo	2022-05-07T00:00:00+1000Z
dc.date.updated	2021-02-26T16:55:44Z
pubs.finish-date	2020-02-20
pubs.publication-status	Published
pubs.start-date	2020-02-17
pubs.volume	00

Abstract:

This paper introduces a new distributed secondary control (DSC) method for distributed energy storage units (DESUs) in an islanded alternative current (AC) microgrid (MG). Dynamics of distributed storages for the extended time duration are not taken into account in the traditional hierarchical control of MG. Thus, it is challenging to control the DESUs with various levels of stored energy represented by the state of charge (SoC). The storage units can utilise their full power capacity after converging to a common SoC to mitigate the generation and demand variations in the MG. SoC depletion of DESUs with lower initial SoC occurs faster than those with higher initial SoC by using the traditional P-f droop control and then their capacities are no longer accessible. Furthermore, applying the droop control to match the SoC of DESUs causes the deviation of frequency and voltage from their reference values. However, restoration of the MG frequency using the conventional DSCs disrupts the SoC-balancing. The designed DSC can achieve simultaneous frequency/voltage regulation, power sharing and SoC-balancing as well as removing the centralized communication. The proposed method is evaluated in the established Matlab/Simulink model and the results validate the effectiveness of the proposed method.

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http://hdl.handle.net/10453/146492