Adaptive optimal control of AC/DC systems

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dc.contributor.authorRostamkolai, Niushaen
dc.contributor.committeechairPhadke, Arun G.en
dc.contributor.committeememberVanLandingham, Hugh F.en
dc.contributor.committeememberBrockhurst, F.C.en
dc.contributor.committeememberMitchiner, R.G.en
dc.contributor.committeememberRahman, Saifuren
dc.contributor.committeememberLong, W.F.en
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2016-05-23T15:20:33Zen
dc.date.available2016-05-23T15:20:33Zen
dc.date.issued1986en
dc.description.abstractThe dissertation presents a new control strategy for two terminal HVDC systems embedded in an AC network. The control is based upon real-time measurements performed on the AC/DC system. Use is made of a technique for high speed accurate measurement of positive sequence voltages and currents, first developed in the field of computer relaying. The real-time measurements provides a term in the control law to compensate for inaccuracies following departure from the operating point. The control criterion is to damp out the electromechanical oscillations following a disturbance. The main contribution of the dissertation is to describe a new optimal controller formulation which contains a measurement based component. Optimal controllers are commonly constructed using linearized equations of the system around the operating point. In DC systems this approach is of a very limited value because of a highly nonlinear nature of the system. With the controller developed in this dissertation, it becomes possible to describe the system as a nonlinear dynamic system. The approximation resulting from the usual linearization of the system equations is thus avoided, and leads to a better controller design. The control technique is illustrated with a small AC/DC system. However, the equations formulated are sufficiently general, so that the technique can be applied to a larger system. Simulation results are included to represent the effectiveness of the developed controller.en
dc.description.degreePh. D.en
dc.format.extentxi, 306 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/71179en
dc.language.isoen_USen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 15555269en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1986.R679en
dc.subject.lcshElectric circuits -- Alternating currenten
dc.titleAdaptive optimal control of AC/DC systemsen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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