A Medium Voltage Cascaded Multi-level Converter with Isolated High Frequency Link Using SiC Switching Devices

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dc.contributor.advisorAbolhassani, Mehdi T.
dc.contributor.committeeMemberShireen, Wajiha
dc.contributor.committeeMemberHan, Zhu
dc.creatorEsho, Alaba Olumide
dc.creator.orcid0000-0002-9726-0030
dc.date.accessioned2018-11-30T20:32:56Z
dc.date.available2018-11-30T20:32:56Z
dc.date.createdAugust 2016
dc.date.issued2016-08
dc.date.submittedAugust 2016
dc.date.updated2018-11-30T20:32:56Z
dc.description.abstractIn this thesis, a new medium voltage multi-level power converter using low voltage SiC devices that would result in an overall efficiency improvement in harnessing renewable energies was analyzed. The topology is based on cascading low voltage power stages that utilize isolated DC-DC converter. The units to be improved are the DC-DC converter, which was used in conjunction with a rectifier (depending on the nature of the renewable energy source- AC or DC power source) and an inverter at the output stage. The DC-DC converter is a Dual Active Bridge with a high frequency link; the high frequency link is possible based on the high-frequency transformer (HFT) and wide band gap switch (silicon carbide (SiC) MOSFET) that was adopted in this topology. Due to the inverse relationship between frequency and the size of magnetic components, the power density of the converter is high, which in-turn gives a higher efficiency. Apart from these benefits, there are a number of advantages in this topology such as the isolated link, the multilevel output, the variable frequency output, the compatibility with High Voltage Direct Current (HVDC) etc. In this case, the generation units could be offshore or in a remote on-shore area due to environmental or aesthetic reasons. One of the major factors that discourage harnessing of renewable energy is the initial cost involved; the topology chosen naturally minimizes the number of components involved and this, in turn, reduces the cost and the failure rate. The final output is a high power quality multilevel AC voltage with low concerns for electromagnetic compatibility. The Simulations were carried out using a library in MATLAB (Simelectronics/Simscape).
dc.description.departmentElectrical and Computer Engineering, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/10657/3530
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectMulti-level
dc.subjectSilicon Carbide
dc.titleA Medium Voltage Cascaded Multi-level Converter with Isolated High Frequency Link Using SiC Switching Devices
dc.type.dcmiText
dc.type.genreThesis
thesis.degree.collegeCullen College of Engineering
thesis.degree.departmentElectrical and Computer Engineering, Department of
thesis.degree.disciplineElectrical Engineering
thesis.degree.grantorUniversity of Houston
thesis.degree.levelMasters
thesis.degree.nameMaster of Science in Electrical Engineering

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