Generalized fast, power flow controller

Details Generalized fast, power flow controller Generalized fast, power flow controller

1992-01-31

1994-08-30

Stephan, Steven L.

Electricity: power supply or regulation systems

For reactive power control

Using converter

363 39, 307105, G05F 500

Patent

active

053431391

ABSTRACT:
First and second dc linked, preferably voltage sourced, inverters are connected to an electric power transmission line in shunt and in series, respectively, by coupling transformers. Firing of the GTO-thyristors of the first inverter is controlled to regulate reactive power on the transmission line and to supply real power requirements of the second inverter. The second inverter is controlled to inject into the transmission line in series a voltage which can be adjusted in magnitude and from zero through 360 degrees in phase with respect to the transmission line voltage to selectively adjust any one or more of transmission line voltage magnitude, transmission line impedance and transmission line voltage phase angle. In a high power configuration of the controller each of the inverters includes a plurality of six-pluse inverter modules connected by interstage transformers to form balanced higher order pulse groups controlled through pulse width modulation or through adjustment of the phase between opposite groups to generate the appropriate ac voltages.

REFERENCES:
patent: 4651265 (1987-03-01), Stacey et al.
patent: 4930064 (1990-05-01), Tanaka et al.
patent: 5041959 (1991-08-01), Walker
patent: 5051683 (1991-09-01), Hirose et al.
patent: 5136494 (1992-08-01), Akagi et al.
patent: 5198746 (1993-03-01), Gyugyi et al.
A Unified Power Flow Control Concept For Flexible AC Transmission Systems, Laszlo Gyugyi, Conference Publication 345, Fifth International Conference, IEE, London, Sep. 17-20, 1991 pp. 19-26.
10 MW GTO Converters For Battery Peaking Service, Loren H. Walker, IEEE IAS SPCC 88-78, pp. 1-9.

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