An Exact Method for Computing Delay Margin for Stability of Load Frequency Control Systems With Constant Communication Delays

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dc.authorid0000-0002-0057-2522
dc.contributor.authorSonmez, Sahin
dc.contributor.authorAyasun, Saffet
dc.contributor.authorNwankpa, Chika O.
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2016
dc.departmentNiğde ÖHÜ
dc.description.abstractThe extensive usage of open communication networks in power system control causes inevitable time delays. This paper studies impacts of such delays on the stability of one-area and two-area load frequency control (LFC) systems and proposes an analytical method to determine delay margins, the upper bound on the delay for stability. The proposed method first eliminates transcendental terms in characteristic equation of LFC systems without making any approximation and transforms the transcendental characteristic equation into a regular polynomial. The key result of the elimination process is that real roots of the new polynomial correspond to imaginary roots of the transcendental characteristic equation. With the help of new polynomial, it is also possible to determine the delay-dependency of system stability and root tendency with respect to the time delay. An analytical formula is then developed to compute delay margins in terms of system parameters. For a large set of controller gains, delay margins of LFC systems are computed to investigate the qualitative effect of controller gains on the delay margin. Finally, simulations studies are carried out to verify the effectiveness of the proposed method.
dc.identifier.doi10.1109/TPWRS.2015.2403865
dc.identifier.endpage377
dc.identifier.issn0885-8950
dc.identifier.issn1558-0679
dc.identifier.issue1
dc.identifier.scopus2-s2.0-84924089994
dc.identifier.scopusqualityQ1
dc.identifier.startpage370
dc.identifier.urihttps://dx.doi.org/10.1109/TPWRS.2015.2403865
dc.identifier.urihttps://hdl.handle.net/11480/3822
dc.identifier.volume31
dc.identifier.wosWOS:000367298100037
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.publisherIEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
dc.relation.ispartofIEEE TRANSACTIONS ON POWER SYSTEMS
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectCommunication time delays
dc.subjectdelay margin
dc.subjectdelay-dependent stability
dc.subjectload frequency control system
dc.titleAn Exact Method for Computing Delay Margin for Stability of Load Frequency Control Systems With Constant Communication Delays
dc.typeArticle

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