PID controller design for first order unstable time delay systems

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buir.advisorÖzbay, Hitay
dc.contributor.authorArslan, Gül Ezgi
dc.date.accessioned2016-01-08T18:14:23Z
dc.date.available2016-01-08T18:14:23Z
dc.date.issued2009
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.descriptionAnkara : The Department of Electrical and Electronics Engineering and the Institute of Engineering and Sciences of Bilkent University, 2009.en_US
dc.descriptionThesis (Master's) -- -Bilkent University, 2009.en_US
dc.descriptionIncludes bibliographical references leaves 103-106en_US
dc.description.abstractIn this thesis, problem of designing P, PI and PD-like controllers for switched first order unstable systems with time delay is studied. For each type of controller, the problem is solved in two steps. First, the set of stabilizing controllers for the class of plants considered is determined using different approaches. Then, an appropriate controller inside this set is chosen such that the feedback systems satisfies a desired property, which is for example gain and phase margin maximization or the dwell time minimization. In the first part, we focus on PI controllers and tune the PI controller parameters in order to maximize the gain and phase margins. The observations in this part show that a P controller is adequate to maximize gain and phase margins. Then, we move on to the problem of tuning P, PI and PD-like (first order stable) controller parameters such that the switched feedback system is stabilized and the dwell time (minimum required time between consequent switchings to ensure stability) is minimized. For this purpose, a dwell-time based stability condition of [39] is used for the class of switched time delay systems. We show that a proportional controller can be found with this method, but a PI controller is not feasible. Finally, we focus on the design of PD-like controllers for switched first order unstable systems with time delays. The proposed method finds the values of PD-like (first order stable) controller parameters which minimize an upper bound of the dwell time. The conservatism analysis of this method is done by time domain simulations. The results show that the calculated upper bound for the dwell time is close to the lower bound of the dwell time observed by simulations. In addition, we compare the obtained PD-like controller results with some alternative PD and first order controller design techniques proposed in the literature.en_US
dc.description.degreeM.S.en_US
dc.description.statementofresponsibilityArslan, Gül Ezgien_US
dc.format.extentxi, 106 leaves, illustrations, graphsen_US
dc.identifier.urihttp://hdl.handle.net/11693/15160
dc.language.isoEnglishen_US
dc.publisherBilkent Universityen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectStability Analysisen_US
dc.subjectSwitched Systemsen_US
dc.subjectTime Delayen_US
dc.subjectPID Controlen_US
dc.subjectDwell Timeen_US
dc.subjectGain Marginen_US
dc.subjectPhase Marginen_US
dc.subject.lccTJ223.P55 A674 2009en_US
dc.subject.lcshPID controllers.en_US
dc.subject.lcshControl theory.en_US
dc.subject.lcshTime delay systems.en_US
dc.titlePID controller design for first order unstable time delay systemsen_US
dc.typeThesisen_US
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