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    Power-cell switching-cycle capacitor voltage control for modular multi-level converters

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    Downloads: 135
    Date
    2018-05-08
    Inventor
    Wang, Jun
    Boroyevich, Dushan
    Burgos, Rolando P.
    Wen, Bo
    Metadata
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    Abstract
    In a modular multi-level power converter, additional switching states are interleaved between main switching states that control output voltage or waveform. The additional switching states provide current from a DC-link to charge capacitors in respective modules or cells to an offset voltage from which the capacitor voltages are controlled toward a reference voltage during each switching cycle rather than being allowed to build up over a period of an output waveform of variable line frequency, possibly including zero frequency. Since the switching cycle is much shorter than the duration of a line frequency cycle and the capacitor voltages are balanced during each switching cycle, output voltage ripple can be limited as desired with a capacitor of much smaller value and size than would otherwise be required.
    URI
    http://hdl.handle.net/10919/87840
    Collections
    • Scholarly Works, Center for Power Electronics Systems (CPES) [33]
    • Scholarly Works, Electrical and Computer Engineering [538]
    • Virginia Tech Patents [619]

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