Device for generating thyristor control pulses to supply an inductance for controlling the reactive power of an electrical network

摘要

The device comprises a generator (11, 13, 17) of a Usy double-slope sawtooth signal a and 2a comprising an input (23) for resetting the signal to each generation of pulses ϑ, and means (15 ) for controlling the passage of the slope of the signal from the value a to the value 2a when the current in the inductor is canceled. A comparator (19) compares this signal Usy to a control voltage U α to which is added in an adder (21) a correcting signal ΔUα developed from the average value of the current i in the inductance, given by an integrator ( 36) receiving as input an image of this current, which is supplied at the output of an integrator (24) receiving as input the image U of the voltage across the inductor, and which comprises a circuit (26 to 34 ) resetting and holding its output to zero when the current is zero in the inductance. The output of the comparator (19) is connected to a pulse converter delivering the pulses ϑ as an output.