Apparatus for controlling the reactive impedance of a transmissi

Details Apparatus for controlling the reactive impedance of a transmissi Apparatus for controlling the reactive impedance of a transmissi

1990-01-02

1991-03-12

Stephan, Steven L.

Electricity: power supply or regulation systems

For reactive power control

Using impedance

323209, G05F 112

Patent

active

049995650

ABSTRACT:
Apparatus for controlling the reactive impedance of a transmission line where capacitive reactance is inserted in series in the line to compensate inductive reactance includes a plurality of three or more capacitor modules connected to each other in series to form a series combination of capacitor modules. Each module is individually bypassed by fast acting thyristor bypass switches so that a central automatic control system can selectively place all of the modules in series where a maximum compensation level is achieved (meaning that the total reactive impedance is at a minimum level), or to provide a minimum change with just one capacitor module.

REFERENCES:
patent: 3703680 (1972-11-01), Frank et al.
patent: 3731183 (1973-05-01), Johnson
patent: 4234843 (1980-11-01), Gyugyi et al.
patent: 4292545 (1981-09-01), Hingorani
patent: 4470005 (1984-09-01), Gyugyi
patent: 4829229 (1989-05-01), Johansson et al.
International Conference on Large High Voltage Electric Systems, 1988 Session (28 Aug.-3 Sep.) "Case Studies of Conventional and Novel Methods of Reactive Power Control, etc.", Taylor et al.
E. W. Kimbark--"Improvement of System Stability by Switched Series Capacitors" (IEEE Transactions on Power Apparatus and Systems, vol. PAS-85, Feb. 1966, pp. 180-188).
Narain G. Hingorani, Jul. 14, 1987, "Future Opportunities for Electric Power Systems".

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