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Control apparatus for a converter for transmitting electric power between an alternating voltage network and a direct voltage network

  • US 5,986,903 A
  • Filed: 10/15/1997
  • Issued: 11/16/1999
  • Est. Priority Date: 03/24/1997
  • Status: Expired due to Term
First Claim
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1. Control apparatus for a plant converter which connects a direct voltage network to an alternating voltage network comprising:

  • first and second current valves connecting said alternating voltage network to a direct voltage network, each of said valves including an electrically controllable breaker connected in parallel with a diode;

    means for detecting the level of current flowing through said valves;

    means for comparing the level of current flowing through said valves with a first predetermined value, and for detecting which of said valves is conducting said current; and

    means for controlling said valves to divert current flowing through said valve conducting current to the other of said valves when the current through a breaker of said valve conducting current exceeds said predetermined value.

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