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dc.contributor.authorFrancis, Geralden
dc.date.accessioned2014-03-14T20:08:19Zen
dc.date.available2014-03-14T20:08:19Zen
dc.date.issued2010-01-25en
dc.identifier.otheretd-03192010-150706en
dc.identifier.urihttp://hdl.handle.net/10919/26462en
dc.description.abstractThis dissertation presents work conducted at the Center for Power Electronics Systems (CPES) at Virginia Polytechnic Institute and State University. Chapter 1 introduces the concept of impedance measurement, and discusses previous work on this topic. This chapter also addresses issues associated with impedance measurement. Chapter 2 introduces the analyzer architecture and the proposed algorithm. The algorithm involves locking on to the voltage vector at the point of common coupling between the analyzer and the system via a PLL to establish a D-Q frame. A series of sweeps are performed, injecting at least two independent angles in the D-Q plane, acquiring D- and Q-axis voltages and currents for each axis of injection at the point of interest. Chapter 3 discusses the analyzer hardware and the criteria for selection. The hardware built ranges from large-scale power level hardware to communication hardware implementing a universal serial bus. An eight-layer PCB was constructed implementing analog signal conditioning and conversion to and from digital signals with high resolution. The PCB interfaces with the existing Universal Controller hardware. Chapter 4 discusses the analyzer software. Software was written in C++, VHDL, and Matlab to implement the measurement process. This chapter also provides a description of the software architecture and individual components. Chapter 5 discusses the application of the analyzer to various examples. A dynamic model of the analyzer is constructed, considering all components of the measurement system. Congruence with predicted results is demonstrated for three-phase balanced linear impedance networks, which can be directly derived based on stationary impedance measurements. Other impedances measured include a voltage source inverter, Vienna rectifier, six-pulse rectifier and an autotransformer-rectifier unit.en
dc.publisherVirginia Techen
dc.relation.haspartFRANCIS_G_D_2010.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectThree Phase AC Systemsen
dc.subjectImpedance Measurementen
dc.subjectD-Q Coordinatesen
dc.subjectRotating Coordinate Systemsen
dc.subjectPower Electronicsen
dc.subjectTransfer Functionsen
dc.titleAn Algorithm and System for Measuring Impedance in D-Q Coordinatesen
dc.typeDissertationen
dc.contributor.departmentElectrical and Computer Engineeringen
dc.description.degreePh. D.en
thesis.degree.namePh. D.en
thesis.degree.leveldoctoralen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.disciplineElectrical and Computer Engineeringen
dc.contributor.committeechairBoroyevich, Dushanen
dc.contributor.committeememberLesko, John Jacken
dc.contributor.committeememberBurgos, Rolandoen
dc.contributor.committeememberBaumann, William T.en
dc.contributor.committeememberTranter, William H.en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03192010-150706/en
dc.date.sdate2010-03-19en
dc.date.rdate2013-05-10en
dc.date.adate2010-05-10en


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