A new PI and PID control design method and its application to active queue management of TCP flows

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buir.advisorÖzbay, Hitay
dc.contributor.authorÜstebay, Deniz
dc.date.accessioned2016-07-01T11:09:56Z
dc.date.available2016-07-01T11:09:56Z
dc.date.issued2007
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.descriptionCataloged from PDF version of article.en_US
dc.description.abstractPID controllers are continuing to be used in many control applications due to their simple structures. Design of such controllers for unstable systems with time delays is an active research area. Recently, stabilizing PI and PD controllers for a class of unstable MIMO (multi-input multi-output) systems with input/output delays have been investigated and allowable controller gain intervals for such controllers have been maximized. Motivated by these studies, this thesis proposes a new method for tuning the parameters of PI, PD and PID controllers for integrating processes with time delays. The method is based on selecting the centers of the maximized gain intervals as the controller gains for the purpose of obtaining optimal controllers. As an application of this method, controllers for AQM (Active Queue Management) of TCP (Transmission Control Protocol) flows have been designed. AQM is a congestion control method used in computer networks to increase link utilization with less queueing delays. The fluid flow model of TCP’s congestion avoidance mode based on delay differential equations supplies the mathematical background for modelling the AQM as a feedback control system and designing different control schemes accordingly. Firstly, the proposed controller design method has been applied to AQM for the case of time invariant time delay and secondly the method has been supported with switching control technique to obtain optimum system performance in the case of time varying time delay. The performance of the designed controllers for both cases has been illustrated by packet level simulations in ns-2.en_US
dc.description.degreeM.S.en_US
dc.description.statementofresponsibilityÜstebay, Denizen_US
dc.format.extentxii, 47 leaves, tables, graphsen_US
dc.identifier.itemidBILKUTUPB103186
dc.identifier.urihttp://hdl.handle.net/11693/29980
dc.language.isoEnglishen_US
dc.publisherBilkent Universityen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectPID controlen_US
dc.subjectTime delayen_US
dc.subjectActive Queue Management (AQM)en_US
dc.subjectSwitching controlen_US
dc.subjectns-2en_US
dc.subject.lccTJ223.P55 U88 2007en_US
dc.subject.lcshPID controllers.en_US
dc.titleA new PI and PID control design method and its application to active queue management of TCP flowsen_US
dc.typeThesisen_US

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Dept. of Electrical and Electronics Engineering - Master's degree