Smart Voltage-Source Inverters with a Novel Approach to Enhance Neutral-Current Compensation

Md Rafi, FH; Hossain, MJ; Town, G; Lu, J

Smart Voltage-Source Inverters with a Novel Approach to Enhance Neutral-Current Compensation

Md Rafi, FH Hossain, MJ

Town, G Lu, J

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Publication Type:: Journal Article
Citation:: IEEE Transactions on Industrial Electronics, 2019, 66 (5), pp. 3518 - 3529
Issue Date:: 2019-05-01

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Field	Value	Language
dc.contributor.author	Md Rafi, FH	en_US
dc.contributor.author	Hossain, MJ https://orcid.org/0000-0001-7602-3581	en_US
dc.contributor.author	Town, G	en_US
dc.contributor.author	Lu, J	en_US
dc.date.accessioned	2020-04-03T05:27:08Z
dc.date.available	2021-05-18T19:01:20Z
dc.date.issued	2019-05-01	en_US
dc.identifier.citation	IEEE Transactions on Industrial Electronics, 2019, 66 (5), pp. 3518 - 3529	en_US
dc.identifier.issn	0278-0046	en_US
dc.identifier.uri	http://hdl.handle.net/10453/139779
dc.description.abstract	© 1982-2012 IEEE. The presence of a neutral current is quite common in three-phase (3P) four-wire (4W) distribution systems due to an unequal distribution of linear and nonlinear single-phase (1P) loads and small distributed generators. However, a high neutral current can overload the neutral conductor and distribution transformer, which can cause electrical safety concerns and even fire. Among several existing neutral current compensators, the 3P four-leg (4L) voltage-source inverter (VSI) provides better control flexibility and more efficient performance than the passive compensators but requires a higher VSI capacity for the fourth-leg operation. To provide a solution to the aforementioned problem, this paper presents a novel control method to utilize the available capacity of a 3P-4L VSI after active and reactive power regulation to enhance the neutral-current compensation. A smart VSI (SVSI) is designed to operate with a solar photovoltaic unit, regulate the ac side voltage, and minimize the neutral current. Case studies are conducted with actual load data from a commercial building in the PSCAD/EMTDC software environment. The designed system with the proposed control method can provide a significant improvement in the neutral-current compensation, phase balancing, and unbalance factor compared to a fixed-capacity 3P-4L SVSI. Experimental results using a TMS320F28335 digital signal processor microcontroller and modified Semiteach 3P-4L inverter are presented to verify the robustness of the designed controller and the enhancement to the neutral-current compensation using the proposed dynamic capacity-control method.	en_US
dc.relation.ispartof	IEEE Transactions on Industrial Electronics	en_US
dc.relation.isbasedon	10.1109/TIE.2018.2856188	en_US
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject.classification	Electrical & Electronic Engineering	en_US
dc.title	Smart Voltage-Source Inverters with a Novel Approach to Enhance Neutral-Current Compensation	en_US
dc.type	Journal Article
utslib.citation.volume	5	en_US
utslib.citation.volume	66	en_US
utslib.for	08 Information and Computing Sciences	en_US
utslib.for	09 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
utslib.copyright.status	open_access	*
pubs.issue	5	en_US
pubs.publication-status	Published	en_US
pubs.volume	66	en_US

Abstract:

© 1982-2012 IEEE. The presence of a neutral current is quite common in three-phase (3P) four-wire (4W) distribution systems due to an unequal distribution of linear and nonlinear single-phase (1P) loads and small distributed generators. However, a high neutral current can overload the neutral conductor and distribution transformer, which can cause electrical safety concerns and even fire. Among several existing neutral current compensators, the 3P four-leg (4L) voltage-source inverter (VSI) provides better control flexibility and more efficient performance than the passive compensators but requires a higher VSI capacity for the fourth-leg operation. To provide a solution to the aforementioned problem, this paper presents a novel control method to utilize the available capacity of a 3P-4L VSI after active and reactive power regulation to enhance the neutral-current compensation. A smart VSI (SVSI) is designed to operate with a solar photovoltaic unit, regulate the ac side voltage, and minimize the neutral current. Case studies are conducted with actual load data from a commercial building in the PSCAD/EMTDC software environment. The designed system with the proposed control method can provide a significant improvement in the neutral-current compensation, phase balancing, and unbalance factor compared to a fixed-capacity 3P-4L SVSI. Experimental results using a TMS320F28335 digital signal processor microcontroller and modified Semiteach 3P-4L inverter are presented to verify the robustness of the designed controller and the enhancement to the neutral-current compensation using the proposed dynamic capacity-control method.

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http://hdl.handle.net/10453/139779