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dc.contributor.advisorEnjeti, Prasad N.en_US
dc.creatorCha, Han Juen_US
dc.date.accessioned2004-11-15T19:45:05Z
dc.date.available2004-11-15T19:45:05Z
dc.date.created2004-08en_US
dc.date.issued2004-11-15
dc.identifier.urihttp://hdl.handle.net/1969.1/1048
dc.description.abstractRecently, matrix converter has received considerable interest as a viable alternative to the conventional back-to-back PWM (Pulse Width Modulation) converter in the ac/ac conversion. This direct ac/ac converter provides some attractive characteristics such as: inherent four-quadrant operation; absence of bulky dc-link electrolytic capacitors; clean input power characteristics and increased power density. However, industrial application of the converter is still limited because of some practical issues such as common mode voltage effects, high susceptibility to input power disturbances and low voltage transfer ratio. This dissertation proposes several new matrix converter topologies together with control strategies to provide a solution about the above issues. In this dissertation, a new modulation method which reduces the common mode voltage at the matrix converter is first proposed. The new method utilizes the proper zero vector selection and placement within a sampling period and results in the reduction of the common mode voltage, square rms of ripple components of input current and switching losses. Due to the absence of a dc-link, matrix converter powered ac drivers suffer from input voltage disturbances. This dissertation proposes a new ride-through approach to improve robustness for input voltage disturbances. The conventional matrix converter is modified with the addition of ride-through module and the add-on module provides ride-through capability for matrix converter fed adjustable speed drivers. In order to increase the inherent low voltage transfer ratio of the matrix converter, a new three-phase high-frequency link matrix converter is proposed, where a dual bridge matrix converter is modified by adding a high-frequency transformer into dc-link. The new converter provides flexible voltage transfer ratio and galvanic isolation between input and output ac sources. Finally, the matrix converter concept is extended to dc/ac conversion from ac/ac conversion. The new dc/ac direct converter consists of soft switching full bridge dc/dc converter and three phase voltage source inverter without dc link capacitors. Both converters are synchronized for zero current/voltage switching and result in higher efficiency and lower EMI (Electro Magnetic Interference) throughout the whole load range. Analysis, design example and experimental results are detailed for each proposed topology.en_US
dc.format.extent1670308 bytes
dc.format.extent172540 bytes
dc.format.mediumelectronicen_US
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.language.isoen_USen_US
dc.publisherTexas A&M Universityen_US
dc.subjectmatrix converteren_US
dc.subjectcommon mode voltageen_US
dc.subjectride throughen_US
dc.subjecthigh frequency linken_US
dc.subjectsoft switchingen_US
dc.titleAnalysis and design of matrix converters for adjustable speed drives and distributed power sourcesen_US
dc.typeThesisen
thesis.degree.departmentElectrical Engineeringen_US
thesis.degree.disciplineVocational Educationen_US
thesis.degree.grantorTexas A&M Universityen_US
thesis.degree.nameDoctor of Philosophyen_US
thesis.degree.levelDoctoralen_US
dc.contributor.committeeMemberStraube, Emil J.en_US
dc.contributor.committeeMemberToliyat, Hamid A.en_US
dc.contributor.committeeMemberBhattacharyya, Shankaren_US
dc.type.genreElectronic Dissertationen_US
dc.type.materialtexten_US
dc.format.digitalOriginborn digitalen_US


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