SU1381663A1 - Device for controlling reversible rectifier converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in valve actuators. The purpose of the invention is to increase reliability. The device comprises a separate operation unit 1, units 2, 3 of phase shifting, switches 7 and 8 of the power supply of the channels for generating control pulses of the valve groups, blocks 16, 17 of protection against overcurrent. Blocks 16, 17 accomplish the disconnection of a randomly energized circuit from power supply 15. In this way, the device eliminates the simultaneous supply of pulses to both groups of thyristors of the reverse gate converter. 1 il.

Description

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The invention relates to electrical engineering and can be used in converter equipment and valve actuators.

The aim of the invention is to increase reliability.

The drawing shows a schematic diagram of the device.

The device for controlling the reversing converter comprises a unit of separate operation of valve groups, the outputs of which are connected to the information inputs of the phase shifting unit 2 of the first valve group and the phase shifting unit 3 of the second ventilation group. In the drawing, blocks 2 and 3 show only output switches 4 and 5, respectively, of the considered phase-shifting channels, the number of which determines the number of specified keys. In addition, the outputs of the separate operation unit 1 of the valve groups are connected to the control inputs of the first-side power supply control channel 6. valve group and 7 power supply channels for the formation of control pulses of the second valve group. Optronic thyristors can be used as keys 6 and 7 for supplying control pulse channels to increase noise immunity. Anodes of the first diodes of 8 all channels are connected to the output of the key 7 of the power supply of the channels of the formation of pulses of control of the keys 6 and 7 of the second valve group. Anodes of second diodes 9 are connected to the output of switch 6 of the first valve group, the cathodes of which are connected to the anodes of the third and fourth diodes 10 and 11, respectively. The cathodes of the diodes 11 are connected to the cathodes of the fifth diodes 12 and the output keys 5 of the block 3. The cathodes of the diodes 10 are connected to the beginnings of the primary windings 13 of the corresponding potential transformer separators of the first valve group, the ends of which are connected to the output keys 4 of the block 2, the cathodes of the diodes 8 and the beginnings of the primary windings 14 of the transformer potential separators of the second valve group, the ends of which are connected to the anodes of the diodes 12. The power supply unit 15, containing a series-connected voltage source and a resistor, is connected input keys 6 and 7 through the first block 16 and second block 17 Overcurrent protection respectively.

The operation of the control device of the reversible valve converter is carried out as follows.

The operation of blocks 2 and 3, depending on the required law of adjustment of the output parameter, is determined by the control signal at their inputs, and also depending on the desired polarity of the output voltage of the converter, the control signal of unit 1, the last block can issue a permission signal to only one - either of blocks 2 or 3. At the same time, the information inputs of the phase shifting channels of another, inoperative, group are blocked. Similarly, management of keys 6 and 7 takes place, i.e., they are open during the period of operation of the valve group and closed in the inoperative valve group. The reverse program provides for the off state of all keys for the time of the pause-free converter when switching the first and second groups.

Thus, after the end of the dead time interval, the enable signal of unit 1 arrives at the control input of the power supply 6 of the first valve group. With the arrival of the transmitting signal at the input of any key 4 of block 2 of the first valve group, it opens and the current of block 15 starts flowing through it through block 16, key 6, diodes 9 and 10, primary winding 13, with a corresponding secondary winding control signal comes directly to the power thyristor. A friend of the valve group works in the same way.

During the operation of the control device of the reversible valve converter, under the conditions of interference, the following emergencies are possible: during operation of the first valve group, as a result of the interference, the key 7 of the second valve group will open; when the first valve group is operating, the output switches 5 of the unit 3 of the second valve group that is not currently in operation will open; during the dead time, both keys 6 and 7 will open; At the same time, keys 4-7 will be opened.

In each of the indicated alarms, under no circumstances will the control signals be transmitted by the transformer potential separators of both groups simultaneously. In addition, the device allows in a number of emergency cases to ensure the operability of the converter. So, for example, when the key 7 of the second valve gruppa is accidentally opened, during the operation of the first valve group, the specified key will receive current from the unit 15 through the second overcurrent protection unit 17, one of the diodes 8 and the operating output key 4 of the unit 2 of the first valve group, limited by the resistance value of the resistor included in the block 15.

When this current reaches a predetermined, predetermined value, the second block 17 is triggered and disconnects the randomly switched on circuit from block 15, and during the response time the potentials at the initial and final terminals of the separators are the same. Consequently, the voltage and current through all primary windings 13 and 14 are zero. Taking into account that this process is of short duration, avarney will not occur during the forced pause. Similarly, the block 16 when the first valve group and the opening of the keys 5 of the block 3.

When used as blocks 16 and 17 nodes with automatic restarting, the efficiency of the converter is fully restored. With a separate group of separate workgroups of valve groups, two outputs are connected to the blocking inputs of two phase shifters and to the control inputs of the first and second switches, the input of the first of which is protected from overcurrent through the first block to the positive pole of the power supply, and the channel outputs each from the phase mixing units of the first valve group are connected to the ends of the primary-time opening of keys 6 and 7 of the military windings of the transformer potential-time of the current-free pause in the device of the nick-type separators with Related Channels

these dangerous processes will not occur, a power group of the same group, characterized in that, with

It will not be violated before the arrival of a signal to improve reliability;

Controls on any of the keys 4 or 5. The second unit is protected against current disturbances.

If by this time conditions, by causing 5 simultaneous switching on of keys 6 and 7 of diodes in each channel of phase mixing, the second unit is protected from extinction disappear, the processes in the circuit will be indicated by the current connected between the positive pole. power supply unit and the input of the wIf the simultaneous opening of all the key, the output of which through the first

Keys 4-7 (which is not likely) will trigger the diodes in each channel connected to both blocks 16 and 17. After they have been re-connected to the connected ends, if the conditions disappear, causing the primary windings of the transformer potential separators of the first valve group and starts primary windings of transformer potential splitters of the second valve group, the output of the first switch through the second diodes in each channel is connected to the connected anodes of the third and fourth diodes, in each channel the cathodes of the third diodes rows are connected to the primary windings transzovatel beginnings and preservation efficiency AOR formatornyh potential dividers emergency, thereby increasing reliability-first gate group cathodes quaternary work ustroystva.tyh diodes with cathodes connected Fifth

f, diodes and with the outputs of the phases of the mixed mixture from the second valve group, the anodes of the fifth

A device for controlling a reversible diode is connected to the ends of the primary bypass converter, which consists of a 35 ms current of the transformer potential of two opposing valve groups, containing separators of the second valve group.

The simultaneous activation of the keys 4 - 7, the operability of the device is fully restored. The diode 11 is designed to eliminate the possibility of energy exchange between the primary windings 13 and 14. Thus, the use of the device leads to the exclusion of the simultaneous output of control pulses to the two thyristors of the reverse gate converter 25

A separate unit of separate operation of valve groups, two outputs connected to the blocking inputs of two phase shifting units and to the control inputs of the first and second switches, the input of the first of which is protected from overcurrent through the first unit to the positive pole of the power supply unit; the phase mixing units of the first valve group are connected to the ends of the primary windings of the transformer potential separators of the corresponding channels

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Claims (1)

Claim A device for controlling a reversible valve converter, consisting of two counter valve groups, containing a separate unit for operating the valve groups, with two outputs connected to the blocking inputs of two phase-shifting units and to the control inputs of the first and second $ keys, the input of the first of which is through the first protection unit from excess current is connected to the positive pole of the power supply, while the outputs of the channels of each of the phase offset blocks of the first valve group are connected to the ends of the primary windings of the transform potential separators of the corresponding channels of the same group, characterized in that, in order to increase reliability, it is equipped with a second overcurrent protection unit, 15 diodes are introduced in each phase-shifting channel, and a second overcurrent protection unit is connected between the positive pole of the power supply and the input of the second switch, the output of which through the first diodes in each channel is connected to the corresponding ends of the primary windings of the transformer potential dividers of the first valve groups and the beginnings of the primary windings of transformer potential dividers of the second valve group, the output of the first key through the second diodes in each channel is connected to the anodes of the third and fourth diodes connected together, in each channel the cathodes of the third diodes are connected to the primary windings of the trans30 potential separators of the first valve group the cathodes of the fourth diodes are connected to the cathodes of the fifth diodes and to the outputs of the phase offset blocks of the second valve group, the anodes of the fifth diodes are connected to the ends of the first egg-shaped coil of transformer potential separators of the second valve group.