Static var generator using self-commutated inverter

Details Static var generator using self-commutated inverter Static var generator using self-commutated inverter

1993-12-06

1995-08-01

Dougherty, Thomas M.

Electricity: power supply or regulation systems

For reactive power control

Using converter

363 39, G05F 170

Patent

active

054382530

ABSTRACT:
A static var generator using self-commutated inverter being able to resume its operation securely and smoothly immediately after a system grounding accident disappears and whose system can be stabilized securely after the accident is provided. The static var generator using self-commutated inverter of the present invention is provided with an accident-detecting circuit 21 comprising band pass filters 22a and 22b extracting the second harmonic components contained in active voltage feedback signals Vp- and reactive voltage feedback signals V.sub.Q -, comparators 23a and 23b comparing these output signals and a prescribed set value and judging of the occurrence of an accident, and an OR circuit 24 operating logical sums of these both output signals. Further, the static type power generator of the present invention comprises a reactive current reference zero controlling circuit 20 controlling a reactive current reference signal I.sub.Q * to be zero according to the detected outputs of the accident-detecting circuit 21, and a soft starting circuit restricting return speeds of the reactive current reference signal at the time of the release of the reactive current reference zero control.

REFERENCES:
patent: 4602206 (1986-07-01), Walker
patent: 4651265 (1987-03-01), Stacey et al.
patent: 4994981 (1991-02-01), Walker et al.
patent: 5047909 (1991-09-01), Hosoda
patent: 5051683 (1991-09-01), Hirose et al.
patent: 5162983 (1992-11-01), Kumagai
patent: 5329221 (1994-07-01), Schauder
"Development and Real System Driving Test of SVG (Static Var Generator)"; Harumoto et al.; Mitsubishi Denki Technical Report; vol. 56, No. 6, 1982, pp. 47-52.

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