Method and apparatus for controlling discharge of a thyristor-sw

Details Method and apparatus for controlling discharge of a thyristor-sw Method and apparatus for controlling discharge of a thyristor-sw

1992-12-09

1995-03-28

Stephan, Steven L.

Electricity: power supply or regulation systems

For reactive power control

Using impedance

323210, G05F 170, H02J 318

Patent

active

054020581

ABSTRACT:
A static VAR compensator (11) is connected across a power transmission line (10) and includes a capacitor (12) connected to transmission line (10). The static VAR compensator (11) includes a capacitor (12) connected to the AC transmission line (10) and thyristor switches (18, 22) for controllably switching the capacitor (12) across the transmission line (10). The thyristors (18, 22) are fired based on signals generated by control circuitry (26, 28, 30). A substantially constant or DC voltage exists across the capacitor (12) after the thyristor switches have been turned-off. Discharge control circuitry (30) generates firing pulses to activate the thyristor switches (18, 22) in order to discharge the capacitor (12) and reduce the voltage across the capacitor (12) to zero. In one embodiment, the capacitor (12) is discharged gradually using a series of discharge pulses. In another embodiment, the capacitor (12) is rapidly discharged by gating the thyristor (16) for a period sufficient to accomplish complete discharge. The capacitor (12) and thyristor switches (18, 22) may be shunted by nonlinear clamping devices (26, 28), and a potential transformer (52) and resistor (50) may be connected in shunt across capacitor (12).

REFERENCES:
patent: 4472674 (1984-09-01), Yano et al.
patent: 4475139 (1984-10-01), Chadwick
patent: 4567424 (1986-01-01), Dobsa et al.
patent: 4571535 (1986-02-01), Gyugyi
patent: 4636910 (1987-01-01), Chadwick
patent: 4719402 (1988-01-01), Brennen et al.
patent: 5093630 (1992-03-01), Sato

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