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MODULAR MULTILEVEL CONVERTER VALVE PROTECTION METHOD

  • US 20140002933A1
  • Filed: 11/29/2011
  • Published: 01/02/2014
  • Est. Priority Date: 03/16/2011
  • Status: Active Grant
First Claim
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1. A modular multilevel converter valve protection method, said modular multilevel converter valve consists of 6 arms, said arms consists of sub modules, is characterized that, said method includes following steps:

  • 1) Connecting said arms with one end of arm control host, another end of said arm control host is connected with the summary control host;

    2) When IGBT or drive temporary faults of sub modules occur, said arm control host will turn off the IGBT of sub modules;

    when information receiving fault of sub module, the overvoltage fault of sub module, undervoltage fault of sub module, frequent check fault of sub module receiving the information, IGBT frequent fault or drive frequent fault occur, said arm control host will close the bypass switch of sub modules;

    when sub module bypass switch refuses to trip, or the bypass number of sub module is too much, said arm control host will send trip request to the summary control host;

    when the time of the arm control host receiving the upper information is out, said arm control host will send system switch request to the summary control host;

    when the arm current is over large, said arm control host will send trip request with the thyristor trigger to the summary control host;

    3) After step

         2), if the fault still exists, said arm control host will close the bypass switch of sub modules, summary and send fault signals to the summary control host;

    4) The summary control host judges the arms trip request, the trip request with the thyristor trigger and system switch request according to arm control host feedback and arm current, and then carries out arms trip, the trip with the thyristor trigger and system switch.

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