CONTROL PULSE GENERATOR FOR GENERATING CONTROL PULSES FOR IGNITION OF THYRISTORS SUPPLYING AN INDUCTANCE REGULATING THE REACTIVE POWER OF AN ELECTRICAL POWER NETWORK

摘要

The thyristor control pulse generator consists of a dual slope sawtooth signal generator (11, 13, 17) providing a signal Usy 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 Usy 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 .