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Article: Comparative Analysis Of Stability Limitations In Weak Grid-connected Synchronous Generator, Vsc, And Dfig Systems Considering The Power Flow Control Dynamics

TitleComparative Analysis Of Stability Limitations In Weak Grid-connected Synchronous Generator, Vsc, And Dfig Systems Considering The Power Flow Control Dynamics
Authors
Issue Date2019
PublisherThe Institution of Engineering and Technology. The Journal's web site is located at http://digital-library.theiet.org/IET-RPG
Citation
IET Renewable Power Generation, 2019, v. 13 n. 1, p. 94-102 How to Cite?
AbstractIn the conventional power systems, the synchronous generators (SGs) are known to suffer stability issues under weak grid conditions. Recently, similar problems are observed in the inverter interfaced systems, including the full voltage source converter (VSC)-based high-voltage DC, and partial VSC interfaced doubly fed induction generator (DFIG) systems, but the root causes of these instabilities in reality are not completely understood yet. This study aims to provide a possible unified explanation for the origin of these instability issues. With the experiences of SG's instability mechanism, for the VSC and DFIG systems, the dynamics of outer power flow controls are mainly focused, and the reduced-order models are parallelly presented first. Then, centralised around the active power control loops of these systems for analysis, it is found that an open-loop zero will move to the right half plane with grid strength decrease. The borders for the occurrence of right-half-plane zeros (RHPZs) are analytically derived. Further, a general interpretation regarding these identified RHPZs' limitations, including the adverse phase lag effect on stability and the attraction effect on the stability boundary, is illustrated. In addition, a uniform explanation for the origin of the RHPZs in these systems is also provided. Time-domain simulations are conducted to validate the analysis.
Persistent Identifierhttp://hdl.handle.net/10722/274995
ISSN
2017 Impact Factor: 3.488
2015 SCImago Journal Rankings: 1.131
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, D-
dc.contributor.authorHou, Y-
dc.contributor.authorHu, J-
dc.date.accessioned2019-09-10T02:33:15Z-
dc.date.available2019-09-10T02:33:15Z-
dc.date.issued2019-
dc.identifier.citationIET Renewable Power Generation, 2019, v. 13 n. 1, p. 94-102-
dc.identifier.issn1752-1416-
dc.identifier.urihttp://hdl.handle.net/10722/274995-
dc.description.abstractIn the conventional power systems, the synchronous generators (SGs) are known to suffer stability issues under weak grid conditions. Recently, similar problems are observed in the inverter interfaced systems, including the full voltage source converter (VSC)-based high-voltage DC, and partial VSC interfaced doubly fed induction generator (DFIG) systems, but the root causes of these instabilities in reality are not completely understood yet. This study aims to provide a possible unified explanation for the origin of these instability issues. With the experiences of SG's instability mechanism, for the VSC and DFIG systems, the dynamics of outer power flow controls are mainly focused, and the reduced-order models are parallelly presented first. Then, centralised around the active power control loops of these systems for analysis, it is found that an open-loop zero will move to the right half plane with grid strength decrease. The borders for the occurrence of right-half-plane zeros (RHPZs) are analytically derived. Further, a general interpretation regarding these identified RHPZs' limitations, including the adverse phase lag effect on stability and the attraction effect on the stability boundary, is illustrated. In addition, a uniform explanation for the origin of the RHPZs in these systems is also provided. Time-domain simulations are conducted to validate the analysis.-
dc.languageeng-
dc.publisherThe Institution of Engineering and Technology. The Journal's web site is located at http://digital-library.theiet.org/IET-RPG-
dc.relation.ispartofIET Renewable Power Generation-
dc.rights[Pre-print to be removed on publication] “This paper is a postprint of a paper submitted to and accepted for publication in [journal] and is subject to IET copyright. The copy of record is available at IET Digital Library [link using doi]”-
dc.titleComparative Analysis Of Stability Limitations In Weak Grid-connected Synchronous Generator, Vsc, And Dfig Systems Considering The Power Flow Control Dynamics-
dc.typeArticle-
dc.identifier.emailHou, Y: yhhou@hku.hk-
dc.identifier.authorityHou, Y=rp00069-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1049/iet-rpg.2018.5001-
dc.identifier.scopuseid_2-s2.0-85059944654-
dc.identifier.hkuros302638-
dc.identifier.volume13-
dc.identifier.issue1-
dc.identifier.spage94-
dc.identifier.epage102-
dc.identifier.isiWOS:000455640700012-
dc.publisher.placeUnited Kingdom-

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