Patent ID: 6657319
Filing Date: 2003-12-02
Classification: H02J

Abstract:
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.