Method and apparatus for symmetrically modulating a controlled s

Details Method and apparatus for symmetrically modulating a controlled s Method and apparatus for symmetrically modulating a controlled s

1993-05-18

1994-03-01

Skudy, R.

Electricity: power supply or regulation systems

For reactive power control

Using impedance

G05F 170, G05F 300, G05F 500

Patent

active

052911209

ABSTRACT:
A method and an apparatus for symmetrically modulating a controlled series compensation system (2) in electrical networks (6). Impedance manipulated variables determined from a current control for the series compensators (14) of the system (2) are limited by determining an upper or lower limiting value (Z.sub.OO,Z.sub.OU). The upper and lower limiting values are respectively determined by adding a positive or negative deviation (.DELTA.Z.sub.+,.DELTA.Z.sub.-) to and subtracting it from a reference manipulated variable (Z.sub.O) for impedance. The reference manipulated variable (Z.sub.O) for impedance is selected from the impedance manipulated variables (Z.sub.y1,Z.sub.y2,Z.sub.y3). Thus, small asymmetries can be corrected and, given network faults of generally only a brief duration, unnecessary control deviations can be avoided.

REFERENCES:
patent: 4755738 (1988-07-01), Shimamura et al.
patent: 4771225 (1988-09-01), Nishikawa
patent: 5099190 (1992-03-01), Sato
Technischer Verlag Resch, KG, Grafelfing, Germany, 1967, Dr. Ing. Leonhard Muller: Reihenkondensatoren in Elektrischen Netzen.
IEE Meeting, 1991, London, UK, N. Christl et al.: Power System Studies and Modelling for the Kayenta 230 Kv Substation Advanced Series Compensation, pp. 33-37.
Cigre Tagung, Summer 1992, N. Christl et al.: Advanced Series Compensation (ASC) with Thyristor Controlled Impedance, pp. 1-10.
EPRI Workshop, Nov. 14-16, 1990, Cincinnati, Ohio, Siemens, Munich, Germany: Advanced Series Compensation with Variable Impedance, 13 pages.

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