SU1413694A1 - Device for controlling thyristor converter - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to devices for phase control of thyristor converters, and can be applied to thyristor electric drives of autonomous rolling stock. The purpose of the invention is to expand the scope. The device contains a three-phase transformer with the first - and second - groups of secondary windings, a diode. and resistors, low frequency filters of synchronization channels, synchronization pulse drivers, first and second elements 3 OR, first and second generators sawtooth. voltage, the first and second keys, the mode switch, the first and second comparators, six logic elements ZI, six logic elements 2I, six logic elements 2IL, and thyristor control pulse drivers. The device ensures the operation of the thyristor converter both in the three-phase bridge circuit mode and in the three-phase circuit mode with zero output with separate control. 2 Il.

Description

The invention relates to electrical engineering, in particular to devices for phase control of thyristor converters, and can be applied in various areas of the national economy, including the thyristor electric drive of autonomous rolling stock.

The purpose of the invention is to expand the field of application.

Fig. 1 shows a block diagram of a thyristor converter control device; figure 2 - diagrams of his work. .

The device contains a three-phase transformer with the first and second 2 groups of secondary windings, diodes 3 and resistors 4-6, filters 7 of low frequency synchronization channels, formers 8 synchronization pulses, the first 9 and second 10 elements 3 OR, the first AND the second 12 generators sawtooth, first 13 and second 14 keys, mode switch 15, first 6 and second 17 comparators, six logic elements 3 and 18, six logic elements 2 and 19, six logic elements 2 OR 20 and shapers 21 thyristor control pulses .

The device for controlling the thyristor converter works as follows.

When a three-phase mains voltage is applied to the input on the secondary windings of the first 1 and second 2 groups, due to the opposite phasing, an out-of-phase voltage with respect to the arc is created. The first three resistors 4 connected to the first group of secondary Hiiix windings 1 form a synchronization voltage of one polarity of the network voltage, while the remaining three resistors 4 form a synchronization voltage of the opposite polarity of the network voltage. The synchronization voltage generated on the resistors 4 is applied to the low-frequency filters 7 of the synchronization channels in which square-wave pulses are generated from the input signal and impulse noise is protected, creating an eight in the network by the operation of thyristors From the output of the filters 7 the synchronization signals are sent to shapers 8 synchronization pulses in which short im-

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pulses corresponding to the beginning of each input pulse, From the output of the first j of the third and fifth drivers 8, the synchronization signals are sent to the first element 3 OR 9, from the output of the second, fourth, fifth and sixth drivers 8, the synchronization signals go to the second element 3 OR 10.

At the output of the first element 3 OR 9, a sum signal is generated from the first, third and fifth drivers 8, at the output of the second element 3 OR 10 a sum signal from. the other three drivers 8, the signals from the outputs of logic elements 9 and 10 are respectively supplied to the generators 11 and 12 of the sawtooth voltage, and from their outputs to the first inputs of the comparators 16 and 17. A control voltage is applied to the second inputs of the comparators 16 and 17. Comparators 16 and 17 compare the output voltages of the generators 11 and 12 of the sawtooth, with the corresponding control voltage coming from the operating mode switching unit,

At the moments of equality of these voltages, pulses are formed at the outputs of each of the comparators 16 and 17, which are 120 electr, degrees behind each other and are fed to the inputs of the pulse distributor. In addition, a synchronization voltage from the outputs of the filters 7 and a signal from the third output of the mode setting unit are supplied to the pulse distributor,

In the Three-phase bridge operation mode, the key 13 is closed and the key 14 is opened in the task setting unit. At the same time, the inputs of the comparators 16 and 17 receive the same control voltage U, and the first inputs of the elements 3 And receive a logical Up signal 1 from the switch output mode, as a result, the thyristors are controlled by dual controls with a control angle varying from 0 to 120 h.

In the converter operation mode according to a three-phase scheme with a zero output, in the mode setting unit 22, the key 13 opens and the key 14 locks, and the output of the mode switch 15 produces a logical O signal.

The inputs of the G6 and 17 comparators are supplied with control voltage from various sources of the control signal, and the elements 3 and 18 are prevented from passing pulses.

Thus, the device ensures the operation of the thyristor converter both in the three-phase bridge circuit mode and in the three-phase circuit mode with zero output with separate control of the cathode and anode groups of gates.

Claims (1)

Invention Formula A device for controlling a thyristor converter containing a two-channel synchronization unit made on a three-phase transformer with two secondary windings with opposite phasing, the first phase outputs of each of which are connected in a star, the second through diodes connected to them and the gearboxes are combined and through corresponding the resistors are connected to their zero points, the common points of connection of the diodes and the resistors are connected via low-pass filters to the inputs of the synchronizer pulse formers and, the outputs of the first, third and fifth synchronization pulse formers are connected to the inputs of the first element 3 OR, the outputs of the second, fourth and sixth synchronization pulse formers are connected to the input of the second element 3 OR, output: the first and second elements 3 OR form the outputs synchronization, respectively, of the first and second channels and connected respectively to the first inputs of the first and second sawtooth generator, the outputs of which are connected respectively to the first inputs of the first and second comparators, the second input of the first comparator is intended to be connected to the epBOi4y source of control voltage, a pulse distributor containing six elements 2 and O, the distributor pulses are intended to be connected via output drivers to the control electrodes of the thyristors, characterized in that, in order to expand the scope of application, it is equipped with a mode setting unit containing two key elements and a mode selector connector, and a pulse distributor additionally equipped with six elements 3 and six elements 2 OR, and. the input of the first key element is designed to be connected to the ROMy source of control voltage, the input of the second key element is to be connected to the second source of control voltage, the outputs of the first and second key elements are combined and connected to the second input of the second comparator, the output of the switch The mode is connected to the first outputs of elements 3 And, the output of the first comparator is connected to the mouth of the first, third and fifth elements of 3 And and the second inputs of the second, fourth and sixth elements. Commodity 2 And, the output of the second comparison element is connected to the second input of the first, third and fifth elements 2 And and the second input of the second, fourth and sixth elements 3 And, exit; the first to the sixth low-frequency filters are connected respectively to the third inputs of the same ZI elements and to the first inputs of the sixth, first, third, fourth and fifth elements of 2 AND, -the first to the sixth elements OR; respectively, are connected to the outputs of the first; the second, third, fourth, fifth and sixth elements 3 And and 2 And, and the outputs form the outputs of the pulse distributor.  6 С 8 С Rig. AT Editor E. Sligan Compiled by S.Stankevich Tehred A. Kravchuk Proofreader V. But ha