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dc.contributor.authorZhou, Boen
dc.date.accessioned2014-11-23T07:00:30Zen
dc.date.available2014-11-23T07:00:30Zen
dc.date.issued2013-05-31en
dc.identifier.othervt_gsexam:347en
dc.identifier.urihttp://hdl.handle.net/10919/50924en
dc.description.abstractIn electric power systems, the existence of constant power loads such as output-regulated power converters may bring instability problem to AC or DC distributed systems. Impedance based stability criteria has been proven a good tool for small-signal stability analysis. This works focuses on the developing of a comprehensive software tool which can extract DC or three phase AC impedances, and apply stability analysis. An algorithm is designed to select FFT window and adjust perturbation frequencies. This feature enables the software to accurately measure impedances even in existence of system line harmonics. Furthermore, multi-tone approach is developed to improve simulation time. The complete software tool is tested with simulation models and experiment results, to show the effectiveness. When multi-tone approach is applied on nonlinear loads, it gives incorrect results. The reason is that perturbation frequency will have overlapping with side-band harmonics. An algorithm is designed to avoid this problem. The algorithm is tested with 12-pulse diode rectifier simulation model, and 6-pulse diode rectifier simulation model and experimental test bed. Both simulation and experiment results verifies the concept.en
dc.format.mediumETDen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectd-q impedanceen
dc.subjectmulti-toneen
dc.subjectdiode bridge rectifieren
dc.titleD-q impedance identification in three phase systems using multi-tone perturbationen
dc.typeThesisen
dc.contributor.departmentElectrical and Computer Engineeringen
dc.description.degreeMaster of Scienceen
thesis.degree.nameMaster of Scienceen
thesis.degree.levelmastersen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.disciplineElectrical Engineeringen
dc.contributor.committeechairMattavelli, Paoloen
dc.contributor.committeechairBoroyevich, Dushanen
dc.contributor.committeememberBurgos, Rolandoen


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