Vernier enhanced control for shunt connected thyristor-controlle

Details Vernier enhanced control for shunt connected thyristor-controlle Vernier enhanced control for shunt connected thyristor-controlle

1993-06-02

1995-07-18

DeBoer, Todd

Electricity: power supply or regulation systems

For reactive power control

Using impedance

323212, 323220, 323233, G05F 1652

Patent

active

054344972

ABSTRACT:
A firing controlled scheme including a method and apparatus for vernier operation of a shunt-connected thyristor-controlled capacitor (STCC) uses phase controlled firing of the thyristors based on monitored line voltage, monitored thyristor current, and a thyristor current command to vary the effective reactance of the capacitor. The STCC includes a capacitor and surge inductor connected in shunt across a power transmission line via a thyristor switch. A vernier controller predicts an upcoming firing angle based on the above parameters and switches the thyristor circuit to partially conduct pulses of thyristor current at different amplitude levels depending upon the commanded firing angle. By varying the firing angle, variable inductive and capacitive reactive power can be selectively delivered to the transmission line.

REFERENCES:
patent: 4348631 (1982-09-01), Gyngyi et al.
patent: 4638238 (1987-01-01), Gyngyi et al.
patent: 4719402 (1988-01-01), Boennen et al.
patent: 5032738 (1991-07-01), Vithayathil
patent: 5202583 (1993-04-01), Larsen et al.
"Case Studies Of Conventional And Novel Methods Of Reactive Power Control On An AC Transmission System", Vithayathil et al, Aug. 28, 1968.

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