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    Isolated high efficiency multiplier cell-based PV system DC-DC converter for residential applications, An

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    Author
    Alsaleem, Abdulhakeem
    Advisor
    Simões, M. Godoy
    Date issued
    2020
    Keywords
    isolated
    transformer
    ZVS
    PV
    DC_DC
    ZCS
    
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    URI
    https://hdl.handle.net/11124/174206
    Abstract
    The global increase in PV installations has driven researchers to find more efficient integration techniques for interfacing PVs with the grid. More innovative converter structures are required to overcome the challenges that face conventional converters. This research presents a high voltage gain isolated DC-DC converter that is suitable for PV applications. The novel converter utilizes a high frequency transformer with 1:1 turns’ ratio and multiplier cells that are also utilizing a 1:1 high frequency transformer. This new approach in topology fabrication allows for a reduced component rating and a very low normalized switch voltage ratio. That means very high voltage gain converters can be realized by using very low voltage switches and diodes. In addition, 1:1 turns’ ratio transformers are easier to design and simpler to manufacture and cut the required duty cycle to half if used in half or full bridge configuration. This research also presents the designed non isolated DC-DC converters that led to the realization of the isolated DC-DC converter. A 450 W prototype is presented and tested to validate the concept and an efficiency study for the converter is also presented.
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