DC-link voltage regulation of inverters to enhance microgrid stability during network contingencies

Hossain, MA; Pota, HR; Haruni, AMO; Hossain, MJ

DC-link voltage regulation of inverters to enhance microgrid stability during network contingencies

Hossain, MA Pota, HR Haruni, AMO Hossain, MJ

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Electric Power Systems Research, 2017, 147, pp. 233-244
Issue Date:: 2017-06-01

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Field	Value	Language
dc.contributor.author	Hossain, MA
dc.contributor.author	Pota, HR
dc.contributor.author	Haruni, AMO
dc.contributor.author	Hossain, MJ
dc.date.accessioned	2022-08-02T06:06:54Z
dc.date.available	2022-08-02T06:06:54Z
dc.date.issued	2017-06-01
dc.identifier.citation	Electric Power Systems Research, 2017, 147, pp. 233-244
dc.identifier.issn	0378-7796
dc.identifier.issn	1873-2046
dc.identifier.uri	http://hdl.handle.net/10453/159491
dc.description.abstract	Equal power-rating inverters operating with different power set-points in either an islanded or grid-connected mode may lead to inter-unit circulating power caused by a large mismatch between power generation and demand during network contingencies (faults on the heavy load side or unintentional islanding). This circulating power may violate the dc-link voltage limit and, as a result, the protection scheme may shut down the inverter and reduce the microgrids reliability. This paper proposes a regulator for controlling the dc-link voltage of the microgrid's inverter during a period of circulating power. It includes a discharging resistor with a series-connected switch across the dc-link capacitor which is turned on through a control algorithm if the dc-link voltage exceeds its pre-defined limit. Case studies of parallel-connected inverters are conducted and their stability assessed through a small-signal analysis. In addition, a realistic microgrid is designed as a low-voltage (LV) network and tested to verify the concept and regulator actions presented. The simulation results validate the effectiveness of the proposed regulator during network contingencies.
dc.language	English
dc.publisher	Elsevier
dc.relation.ispartof	Electric Power Systems Research
dc.relation.isbasedon	10.1016/j.epsr.2017.02.026
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0906 Electrical and Electronic Engineering
dc.subject.classification	Energy
dc.title	DC-link voltage regulation of inverters to enhance microgrid stability during network contingencies
dc.type	Journal Article
utslib.citation.volume	147
utslib.for	0906 Electrical and Electronic 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	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2022-08-02T06:06:52Z
pubs.publication-status	Published
pubs.volume	147

Abstract:

Equal power-rating inverters operating with different power set-points in either an islanded or grid-connected mode may lead to inter-unit circulating power caused by a large mismatch between power generation and demand during network contingencies (faults on the heavy load side or unintentional islanding). This circulating power may violate the dc-link voltage limit and, as a result, the protection scheme may shut down the inverter and reduce the microgrids reliability. This paper proposes a regulator for controlling the dc-link voltage of the microgrid's inverter during a period of circulating power. It includes a discharging resistor with a series-connected switch across the dc-link capacitor which is turned on through a control algorithm if the dc-link voltage exceeds its pre-defined limit. Case studies of parallel-connected inverters are conducted and their stability assessed through a small-signal analysis. In addition, a realistic microgrid is designed as a low-voltage (LV) network and tested to verify the concept and regulator actions presented. The simulation results validate the effectiveness of the proposed regulator during network contingencies.

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http://hdl.handle.net/10453/159491