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SiC power electronic devices evaluation and magnetic components design in wind power system
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Guo, Xuan (2021) SiC power electronic devices evaluation and magnetic components design in wind power system. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3851564
Abstract
Due to the rapid development of wind power generation systems, Si-based devices have gradually been unable to fulfil the high frequency, high temperature and high power density requirements of future wind power generation systems. Silicon Carbide (SiC) power electronics devices are considered the best alternative to the Si counterparts in low-voltage (690V) wind power generation systems.
This thesis investigates the impact of SiC devices in a low-voltage (690V) and MW level wind power generation system compared to the traditional Si device on power loss, efficiency and passive components. The comparison between Si and SiC devices is based on a two-level back-to-back converter, which indicates that the SiC-based converter can always achieve higher efficiency at a wide operation range. Moreover, the SiC-based converter can operate at a higher switching frequency without compromising the efficiency, which leads to a 90% reduction in the size of the filter inductor. As unipolar devices, SiC MOSFETs can offer lower conduction loss at low wind speed and the channel reverse conduction capability of SiC MOSFETs can reduce the conduction loss of the generator side converter by 38% and 54% at the 12 and 10 m/s wind speeds, respectively. Finally, an alloy gap replacement method is presented to reduce the concentrated loss of the nanocrystalline core. The experimentally validated FE model indicates that the total eddy current loss can be limited to 71% and 73% at gap-winding and side-winding positions, respectively at 20kHz and 32A peak-to-peak ripple current. Moreover, the highest temperature of the hotspot can be reduced and a more uniform temperature distribution is observed.
Item Type: | Thesis (PhD) | ||||
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Subjects: | T Technology > TJ Mechanical engineering and machinery T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Library of Congress Subject Headings (LCSH): | Wind power, Wind power -- Research, Silicon carbide -- Electric properties, Metal oxide semiconductor field-effect transistors | ||||
Official Date: | May 2021 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | School of Engineering | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Ran, Li ; Alatise, Layi | ||||
Format of File: | |||||
Extent: | xxiv, 213 leaves : illustrations (some colour), charts | ||||
Language: | eng |
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