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Electric power system interconnection device

  • US 6,657,319 B2
  • Filed: 05/23/2002
  • Issued: 12/02/2003
  • Est. Priority Date: 11/09/2001
  • Status: Expired due to Term
First Claim
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1. An electric power system interconnection device for providing uninterrupted electric power to a load by establishing coordinated interconnection of a primary power supply and a secondary power supply, in which the primary power supply is connected to the load via a switch and the secondary power supply is connected to a load side of the switch via a power converter, said electric power system interconnection device comprising:

  • an interrupt control circuit which outputs an interrupt control signal for opening the switch upon detecting an abnormal voltage fed from the primary power supply;

    a switch current interrupter for accelerating interruption of a current flowing through the switch by controlling an output current of the power converter with an output current command using the interrupt control signal as an input; and

    a constant voltage controller for maintaining a constant voltage applied to the load by controlling the power converter to output the constant voltage upon detecting the interruption of the current flowing through the switch.

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