SU518858A1 - Device for alternately controlling a reversible valve converter with a series connection of two bridges - Google Patents

Description

FIG. 1 shows a block diagram of the device; in fig. 2 - diagrams explaining his work.

The device contains FSHD-1, FSU-2 fascidal blocks; logical keys, OR-2, NO-1, NO-2; pulse formers PI-1, FI-2; differentiating chains DC-1, DC-2; FUI-1, FUI-2 control pulse drivers.

Trigger pulses (ZI- "1) pass through the key through the key OR-.1 and start the pulse shaper (), at the output

which produces rectangular pulses with a duration of 5-10 e. hail. In MO-. The end of these pulses at the output of the differentiating chain (DC-1) produces a short pulse. With the NBT-1 open key, this pulse suppresses all control pulses (I-1) at the output of the control pulse former i (FUI-2). Similarly (see Fig. 2a), control pulses are quenched (CID-2). As a result, at the moment of arrival of any control impulse to One Bridge on the second after the connected bridge, there are always 5-10 e-grades, there are control pulses. So that the duration of the common portion of the control pulses is reduced when the phase shift between the damped pulses (and ZI-2) is one hundred times the Tf pulse duration at the outputs of the pulse formers (FI-1 and FI-2), when a signal appears with the driver pulses (FI-1), the control pulses are prohibited: general pulses (UI-2), and when the pulse-former (PI-2) signal appears, the masking is prohibited (see Fig. 26);

pulses (UI-1).

Thus, in all modes, the control washers, common in ozta, are provided, the magnitude of which is not changed by the pulse duration, which ensures a stable

operation of the converter with alternate control in the mode of intermittent currents. When using the proposed device, there will always be moments when all the control pulses are absent on one of the bridges, as a result of which the thyristors of this bridge are closed without increasing the angles

adjustment to the maximum, which leads to a decrease in the current-free pause when current is reversed. In addition, the failure of the proposed device does not lead to an accident in the main circuits, since the formers of the control pulses FUI-1 and FUI-2 are designed so that in the absence of damping pulses from the outputs of the keys NO-1 and NET 2, the duration of the control pulses is equal to two periods of ripple current rectified, Tie. for a three-phase bridge circuit - 12O el. hail, (in steady state).

Claims (1)

Invention Formula A device for sequential control of a reversible valve converter with a series connection of two washes®, containing for each bridge a phase-shifting unit, a driver of control pulses with damping circuits, so that the reverse of the current tsauza, the output circuits of the phase-shifting unit of each bridge are connected via the OR key to the input of the pulse generator of a given duration, the output of which through the differentiating chain is connected to the input of the prohibition key; - stroke which is associated with a chain of another blanking pulses psyuledovatelno connected bridge, and prohibiting entrance prohibition switch is connected to the output generates a pulse of predetermined duration yuatel another serially connected bridge. I ZN-1 FSU-1  rf I-1 Shi-2 ph-g ZI2 fy-2 and-( - A // - 2 - - Signal . quenching di-1 HE7-Z ds-g CiitHaji zaufe / fu9 F fe UN-i - tmH L BUT .Z