Protection of inverter-based microgrids from ground faults by an innovative directional element

Mahamedi, B; Zhu, JG; Eskandari, M; Fletcher, JE; Li, L

Protection of inverter-based microgrids from ground faults by an innovative directional element

Mahamedi, B Zhu, JG

Eskandari, M

Fletcher, JE Li, L

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Publication Type:: Journal Article
Citation:: IET Generation, Transmission and Distribution, 2018, 12 (22), pp. 5918 - 5927
Issue Date:: 2018-12-11

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Field	Value	Language
dc.contributor.author	Mahamedi, B	en_US
dc.contributor.author	Zhu, JG https://orcid.org/0000-0002-9763-4047	en_US
dc.contributor.author	Eskandari, M https://orcid.org/0000-0003-1185-9585	en_US
dc.contributor.author	Fletcher, JE	en_US
dc.contributor.author	Li, L https://orcid.org/0000-0001-8485-2216	en_US
dc.date.issued	2018-12-11	en_US
dc.identifier.citation	IET Generation, Transmission and Distribution, 2018, 12 (22), pp. 5918 - 5927	en_US
dc.identifier.issn	1751-8687	en_US
dc.identifier.uri	http://hdl.handle.net/10453/129645
dc.description.abstract	© The Institution of Engineering and Technology 2018. The complicated response of inverter-interfaced distributed generators (IIDG) to faults has been reported, which severely affects all parts of relaying, i.e. fault sensing and polarisation, and faulted phase selection. Given this, the root causes of difficulties in dealing with the protection of inverter-based microgrids are explained. Then, the study describes a directional element using unique features of zero-sequence components that retains satisfactory performance even in IIDG-based microgrids. The zero-sequence component is the only sequence component that can be calculated in the time domain without time delay and thus can cause less delay in the outcome of protective schemes compared with the other two sequences. With this, instantaneous zero-sequence power is defined and one term derived from it, zero-sequence reactive power, is utilised to polarise ground faults. It is proven that the zero-sequence reactive power is negative for forwarding ground faults and positive for reverse ground faults. An interesting feature is that the zero-sequence reactive power is calculated by averaging a new quantity in the time domain over half a power cycle. Hence, the time delay is half that of the conventional phasor-based methods. A sample microgrid is simulated in MATLAB/SIMULINK to evaluate the directional element and the results demonstrate the improvements.	en_US
dc.relation.ispartof	IET Generation, Transmission and Distribution	en_US
dc.relation.isbasedon	10.1049/iet-gtd.2018.5469	en_US
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Energy	en_US
dc.title	Protection of inverter-based microgrids from ground faults by an innovative directional element	en_US
dc.type	Journal Article
utslib.citation.volume	22	en_US
utslib.citation.volume	12	en_US
utslib.for	0906 Electrical and Electronic Engineering	en_US
pubs.embargo.period	Not known	en_US
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
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
pubs.organisational-group	/University of Technology Sydney/Students
utslib.copyright.status	closed_access	*
pubs.issue	22	en_US
pubs.publication-status	Published	en_US
pubs.volume	12	en_US

Abstract:

© The Institution of Engineering and Technology 2018. The complicated response of inverter-interfaced distributed generators (IIDG) to faults has been reported, which severely affects all parts of relaying, i.e. fault sensing and polarisation, and faulted phase selection. Given this, the root causes of difficulties in dealing with the protection of inverter-based microgrids are explained. Then, the study describes a directional element using unique features of zero-sequence components that retains satisfactory performance even in IIDG-based microgrids. The zero-sequence component is the only sequence component that can be calculated in the time domain without time delay and thus can cause less delay in the outcome of protective schemes compared with the other two sequences. With this, instantaneous zero-sequence power is defined and one term derived from it, zero-sequence reactive power, is utilised to polarise ground faults. It is proven that the zero-sequence reactive power is negative for forwarding ground faults and positive for reverse ground faults. An interesting feature is that the zero-sequence reactive power is calculated by averaging a new quantity in the time domain over half a power cycle. Hence, the time delay is half that of the conventional phasor-based methods. A sample microgrid is simulated in MATLAB/SIMULINK to evaluate the directional element and the results demonstrate the improvements.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/129645