Distributed DC-Bus Signaling Control of Photovoltaic Systems in Islanded DC Microgrid

Poursafar, N; Hossain, MJ; Taghizadeh, S

Distributed DC-Bus Signaling Control of Photovoltaic Systems in Islanded DC Microgrid

Poursafar, N Hossain, MJ Taghizadeh, S

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Publication Type:: Journal Article
Citation:: CSEE Journal of Power and Energy Systems, 2022, 8, (6), pp. 1741-1750
Issue Date:: 2022-11-01

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Field	Value	Language
dc.contributor.author	Poursafar, N
dc.contributor.author	Hossain, MJ
dc.contributor.author	Taghizadeh, S
dc.date.accessioned	2023-03-23T02:12:04Z
dc.date.available	2023-03-23T02:12:04Z
dc.date.issued	2022-11-01
dc.identifier.citation	CSEE Journal of Power and Energy Systems, 2022, 8, (6), pp. 1741-1750
dc.identifier.issn	2096-0042
dc.identifier.uri	http://hdl.handle.net/10453/168154
dc.description.abstract	The stability of an islanded DC microgrid (DCMG) is highly dependent on the presence and performance of the backup energy storage system (BESS), due to the lack of main grid support. This condition makes the DCMG vulnerable to the critical situation of absence of the BESS, which could be caused by a fault or being fully charged or flat. This paper presents an enhanced distributed DC-bus signaling control strategy for converters of photovoltaic systems (PVs) to make the islanded DCMG less dependent on the BESS. Unlike a conventional control approach that utilizes PVs to operate in maximum power point tracking (MPPT) mode and the BESS solely regulating DC-bus voltage, the proposed control method maintains DC-bus voltage via intelligently managing output powers of the PVs. The proposed control method continuously monitors DC-bus voltage and regulates the output powers of all the PVs via switching between MPPT mode and voltage regulating mode. Accordingly, if the DC-bus voltage level is less than a predefined maximum level, the PVs work in MPPT mode; otherwise, the PVs work in voltage regulating mode to maintain DC-bus voltage at an acceptable range. Such switching between MPPT and voltage regulating control operations results in protecting the DCMG from unavoidable shutdowns conventionally necessary during the absence of the BESS unit. Moreover, the proposed control method reduces oscillations on the DC-bus voltage during existence of the BESS. The performance and effectiveness of the proposed control strategy are validated through different case studies in MATLAB/Simulink.
dc.language	en
dc.relation.ispartof	CSEE Journal of Power and Energy Systems
dc.relation.isbasedon	10.17775/CSEEJPES.2021.03490
dc.rights	info:eu-repo/semantics/closedAccess
dc.title	Distributed DC-Bus Signaling Control of Photovoltaic Systems in Islanded DC Microgrid
dc.type	Journal Article
utslib.citation.volume	8
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	closed_access	*
dc.date.updated	2023-03-23T02:12:03Z
pubs.issue	6
pubs.publication-status	Published
pubs.volume	8
utslib.citation.issue	6

Abstract:

The stability of an islanded DC microgrid (DCMG) is highly dependent on the presence and performance of the backup energy storage system (BESS), due to the lack of main grid support. This condition makes the DCMG vulnerable to the critical situation of absence of the BESS, which could be caused by a fault or being fully charged or flat. This paper presents an enhanced distributed DC-bus signaling control strategy for converters of photovoltaic systems (PVs) to make the islanded DCMG less dependent on the BESS. Unlike a conventional control approach that utilizes PVs to operate in maximum power point tracking (MPPT) mode and the BESS solely regulating DC-bus voltage, the proposed control method maintains DC-bus voltage via intelligently managing output powers of the PVs. The proposed control method continuously monitors DC-bus voltage and regulates the output powers of all the PVs via switching between MPPT mode and voltage regulating mode. Accordingly, if the DC-bus voltage level is less than a predefined maximum level, the PVs work in MPPT mode; otherwise, the PVs work in voltage regulating mode to maintain DC-bus voltage at an acceptable range. Such switching between MPPT and voltage regulating control operations results in protecting the DCMG from unavoidable shutdowns conventionally necessary during the absence of the BESS unit. Moreover, the proposed control method reduces oscillations on the DC-bus voltage during existence of the BESS. The performance and effectiveness of the proposed control strategy are validated through different case studies in MATLAB/Simulink.

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http://hdl.handle.net/10453/168154