Apparatus for controlling the parallel operation of an A-C outpu

Details Apparatus for controlling the parallel operation of an A-C outpu Apparatus for controlling the parallel operation of an A-C outpu

1986-08-28

1987-10-27

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 46, 307 87, H02J 900

Patent

active

047031930

ABSTRACT:
An apparatus for controlling the parallel operation of a commercial power source and an A-C output converter in which the A-C output converter of a variable voltage and a variable frequency is connected and operated in parallel with the commercial power source; an impedance element is provided between said commercial power source and an output terminal of at least one phase which represents an internally generated voltage of the A-C output converter, the impedance element being connected in parallel with an output impedance of a main circuit of the A-C output converter, and the voltage and frequency of the A-C output converter being controlled so that a current that flows through said impedance element assumes a predetermined value.

REFERENCES:
patent: 4251735 (1981-02-01), Coleman
patent: 4409533 (1983-10-01), Kawabata
patent: 4510401 (1985-04-01), Legoult
patent: 4516035 (1985-05-01), Rhoads et al.
patent: 4528457 (1985-07-01), Keefe et al.
patent: 4588900 (1986-05-01), Honjo
patent: 4604530 (1986-08-01), Shibuya
"DC-TO-AC Power Converter for Fuel Cell System", Asaeda et al IECE Japan, Oct. 1983.
"The Interaction of Batteries and Fuel Cells with Electrical Distribution Systems: Force Commutated Converter Interface", Garais et al, IEEE, 1977.

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