System interconnection device and method of designing same

Details System interconnection device and method of designing same System interconnection device and method of designing same

1999-04-07

2000-11-14

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

361 62, 361 939, 307 86, H02H 900

Patent

active

061478458

ABSTRACT:
A system interconnection device connected between two systems, such as a commercial bus line carrying power from a commercial power line and a private bus line carrying power from a private power generator, is able to connect and disconnect the two systems, and, in the event of a fault, has a current-limiting effect, thus preventing instantaneous voltage drop of the respective bus lines. In the system interconnection device, unit parallel circuits made up of diodes and DC reactors are serially connected so that the diodes thereof have opposite directions. With this structure, in realizing operations equivalent to those of a conventional system interconnection device having a DC reactor between DC terminals of a single-phase rectifying bridge circuit, the number of diodes, which are rectifying elements, can be halved. This not only enables reduction of the total cost of elements, but also, particularly in high-voltage and extra-high-voltage systems, enables great reduction of the cost and space devoted to insulation.

REFERENCES:
patent: 4438474 (1984-03-01), Paice
patent: 4539617 (1985-09-01), Delaney et al.
patent: 4642747 (1987-02-01), Cho
patent: 4771229 (1988-09-01), Ziegler

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