Thyristor-controlled series capacitor triggering system

Details Thyristor-controlled series capacitor triggering system Thyristor-controlled series capacitor triggering system

1995-03-23

1998-09-08

Nguyen, Matthew V.

Electricity: power supply or regulation systems

For reactive power control

Using impedance

323205, G05F 170

Patent

active

058049495

ABSTRACT:
A trigger control system for a thyristor-controlled series capacitor (TCSC) is disclosed. In one application, a power system 10 is coupled to a load 12 by a series capacitor 14 connected in parallel to a thyristor unit 16 and inductor 17. The thyristors are triggered by the control system 18, which includes a first circuit 20 that generates signals proportional to the peak of the line currents, a stabilizer circuit 22, an adder 24, a look-up table 26, a conversion circuit 28, a pulse generator 30, a phase-locked loop (PLL) 32, a ramp generator 34, a trigger window circuit 36, and a three input AND gate 38 the output of which is a grid pulse signal 40 that triggers the thyristor unit 16. The control system diminishes power swing oscillations and subsynchronous resonance oscillations.

REFERENCES:
patent: 4292545 (1981-09-01), Hingorani
patent: 4355241 (1982-10-01), Hingorani
patent: 4434376 (1984-02-01), Hingorani
patent: 5202583 (1993-04-01), Larsen et al.
patent: 5227713 (1993-07-01), Bowler et al.
patent: 5374853 (1994-12-01), Larsen et al.
patent: 5420495 (1995-05-01), Hingorani
patent: 5424627 (1995-06-01), Clark et al.
patent: 5434497 (1995-07-01), Larsen
Vithayathil et al., "Case Studies of Conventional and Novel Methods and Reactive Power Control of an AC Transmission System," International Conference on Large High Voltage Electric Systems, 1988 Session, Aug. 28-Sep. 3, 1988.

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