Control pulse generator for thyristors supplying a reactive powe

Details Control pulse generator for thyristors supplying a reactive powe Control pulse generator for thyristors supplying a reactive powe

1985-01-16

1986-11-25

Salce, Patrick R.

Electricity: power supply or regulation systems

For reactive power control

Using impedance

323211, G05F 170

Patent

active

046251618

ABSTRACT:
The thyristor control pulse generator consists of a dual slope sawtooth signal generator (11, 13, 17) providing a signal U.sub.sy with slopes a and 2a, said sawtooth generator comprising an input (23) for resetting the signal to zero in response to each generated pulse .theta. and means (15) for controlling the switching of the signal slope from value a to value 2a at the time the current in the reactive power regulating inductor becomes cancelled. A comparator (19) compares said signal U.sub.sy to a control voltage U.alpha. to which a correcting signal .DELTA.U.alpha. is added in a summing circuit (21), which correcting signal is developed from the means value of the current i in the inductor, given by an integrator (36) receiving at its input an image of said current, said image being taken from the output of another integrator (24) which receives the image U of the voltage across the terminals of the inductor at its input and includes a circuit (26 to 33) for resetting and holding its output to zero when no current is flowing in the inductor. The output of the comparator (19) is connected to a pulse converter (22) which outputs the thyristor firing pulses .theta..

REFERENCES:
patent: 3703680 (1972-11-01), Frank et al.
patent: 4143315 (1979-03-01), Kelley, Jr.
patent: 4289951 (1981-09-01), Jurek
patent: 4292545 (1981-09-01), Hingorani
patent: 4451777 (1984-05-01), Gyugyi

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