SU1515292A1 - Device for controlling reversible rectifier converter - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to enhance the functionality, increase reliability, reduce power consumption. In the case when at the receipt of an authorization signal from the output of the element OR 13 or 14, any of the output keys 5 of both valve groups are opened at the same time, which causes the condition for the element OR 13 and the additional key 9 of the inoperative valve group to trip, the control signal directly to the power supply thyristor will not arrive. The said control signal will not be received because the additional switch 8 or 9 will open faster than the current will increase in the circuits containing elements with a large inductance of the primary winding in the transformer potential separators. In this case, the current begins to flow from the power supply unit 12 through the protection unit 10 or 11 from overcurrent, additional switch 8 or 9, corresponding diodes of the diode assembly 7, output switches 5 of this valve group. A falsely activated group will be disconnected by the block 10 or 11 protection against overcurrent located in its circuit. 1 il.

Description

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faster than an increase in current n of the chains containing elements with a large inductance of the primary winding in transformer potential dividers. In this case, the current begins to flow from the power supply unit 12 through the protection unit 10 or II from overcurrent, additional switch 8 or 9, corresponding diodes of the diode assembly 7, output switches 5 of this valve group. A falsely activated group will be disconnected by the block 10 or 11 in its circuit, which are protected by the current. 1 il.

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

The purpose of the invention is to expand the functionality, increase reliability, reduce power consumption.

The drawing shows the principle of a device for controlling a reversible valve converter.

The device for controlling the reversible converter contains a unit 1 for separate operation of valve groups and two identical structural units: system 2 for controlling the valve group Back and system 3 for controlling the valve group Forward. Each of these systems includes a phase shifting unit 4, the input of which is connected to the corresponding output of the unit 1 of separate operation of valve groups. The outputs of the phase offset unit 4, the number of which is equal to the number of phase offset channels H11 in each of the valve groups, are connected to the corresponding inputs of the output switches of the 5 phase offset channels. The outputs of the output switches of the 5 channels for phase shifting the connection with the ends of the primary windings 6 of the transformer potential dividers, and also through the corresponding diodes of the diode assemblies 7, with the outputs of the additional switches 8 or 9, moreover, the anodes of the diodes are connected to the additional switches 8 and 9 diode assemblies 7, the number of which in them is equal to the number of channels of the phase shift of both valve groups. The primary windings of the transformer potential dividers 6 start: each valve group is connected to the inputs of the corresponding first or second additional switches 8 and 9, not to the outputs of the overcurrent protection blocks 10

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and II, respectively, whose inputs are connected to the positive pole of the power supply unit 12, which contains in series the voltage source and resistor. The control inputs of the first and second additional keys 8 and 9 are connected to the outputs of the first and second elements OR 13 and 14, respectively. The first input of the first element OR 13 is connected to the output of the first element AND 15, the second input is connected to the output of the separate operation unit I connected to the phase shifter unit 4 of the VENTURE group Forward, the first input of the first logic element AND 15 is connected to the output of the second additional key 9, the second input is connected to the clamp of the thyristor state sensor of the Forward valve group.

The nepBbUi input of the second element OR 14 is connected to the output of the second element AND 16, the second input is connected to the output of the separate operation unit 1 connected to the phase offset unit 4 of the valve group Back, the first input of the second element And 16 is connected to the output of the first additional key 8, the second input is connected with clamps of the thyristor state sensor of the Naz / 1d valve group (similar to that used for the Forward group).

The device for controlling the reversing valve converter works as follows.

The operation of the 4 Forward and Back Phase Displacement Unit 4, respectively, depending on the desired control law of the output parameter, is determined by the control signal U at their inputs, and also depending on the desired polarity of the output voltage of the converter, by the control signal I 3 of the control unit 1 of separate operation of the valve groups. At the same time, the information inputs of the phase offset channels of the other (idle group are fed with a sanpeuiaHiiiyn i signal. The reverse program provides for the off state of all keys 5, 8 and 9 for the time of the pause of the converter when switching groups Forward and Back.

During normal operation, additional switches 8 and 9 are closed and do not affect the operation of the control device of the reversing valve converter, since the outputs of the OR 13 and 14 elements contain a inhibitory signal, the presence of which is due to the OR 13 and 14 elements that are present at the inputs 15 and 16 prohibitory signals. The first input of each of the elements 15 and 16 is signaled by the presence of voltage of the output switches of the 3 channels of the phase displacement of the opposite valve group, the second input is a signal from the thyristor state sensor of the opposite valve group, the second input of each of the elements OR 13 and 14 the enable signal of the opposite valve group from the unit 1 of the separate operation of the valve groups. The appearance of one of these three signals at the input of the OR 13 and 14 elements and the AND 15 or 16 elements triggers the activation of the additional key 8 or 9, respectively, but the tripping of the blocks 10 or 11 of the over current protection does not occur until The output keys 5 of the inoperative valve group will not open.

The occurrence of an enable signal at the output of the element OR 13 or 4 will occur when the opposite-valve group is operating (signal from the thyristor state sensor of the opposite valve group), when the signal is interrupted from the unit 1 of separate valve group operation to an idle valve group during operation if at the same time any of the output switches of the 5 channels of the phase shifting of both valve groups are open and current can flow through the primary windings of 6 potential transformer separators,

In the case when upon the receipt of an authorization signal from the output of the element OR 13 or 14, any of the output switches 5 of both valve groups will be open at the same time, which causes

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element 1 LI 13 and additional key 9 of an inoperative valve group, the control signal will not go directly to the power thyristor, as additional key 8 or 9 from; digs faster than the current increases in circuits containing elements with high inductance primary winding 6 transformer potential separators. At the same time, the current {starts flowing from power supply I2 through power supply unit 10 or II from overcurrent, an additional switch B or 9, corresponding diodes of the diode assembly 7, output switches 5 of this valve group and a falsely activated group will be disconnected unit 10 or 1 1 of protection against overcurrent due to a sharp increase in the current in this circuit, which is due to the decrease in its resistance (due to the shunting of the corresponding primary windings 6 of the Trapsformer.1x potential separators). This will allow the valve assembly to continue trouble-free operation even when conditions arise for the single turn-on of both valve groups. With the disappearance of after-fault 1x and the case of isolator), as the units 10 or 11 of protection against overcurrent of automatic devices, it is possible 11l.ll1, n. work of both .1п..иых groups.

During the operation of the device for control 31 Lepi revers "; l, n1 pei.tkpnym converter P keblgatyh conditions (with high interference level) the following emergency situations are possible- 1; and:

- when the ventilation group is working back, the output keys (5) of the cHCTeribi control of the ventilation group forward will open;

- at the same time, additional keys (in and 9) are opened with closed input keys (.);

- Additional keys (8 and 9) and output keys (5) of both valve groups will open at the same time.

In each of the above emergency situations, the control signals will not be transmitted by the transformer potential splitters of both groups at the same time, as the disconnection of the phpan from the channels of the phase shifted ni-p iCorai uuej i group will occur

py. In addition, the device ensures the operability of the converter in these conditions.

For example, if the output keys 5 of the system 3 of the control of the valve group Forward are opened during the operation of the valve group Back, the protection (10) protection unit 10 will be inhibited. When used as a unit 10 (, protection against overcurrent of devices with automatic restarting, the operability of the converter is fully restored.

When simultaneously unlocking additional keys 8 and 9, but with the output keys 5 closed during the pause, no emergency processes will occur in the device until you unlock any of the output keys 5. At the same time, the processes in the device will be rtocHTb described above.

When simultaneously unlocking additional keys 8 and 9 and output keys 5 of systems 2 and 3 of control of both valve groups, both protection units 10 and 11 against overcurrent will operate simultaneously. After they are turned on again, if the conditions causing simultaneous switching on of additional switches 8 and 9 and output switches 5 of systems 2 and 3 of control of both valve groups disappear, the device is fully restored.

Thus, the device for controlling the reversing valve converter independently determines the need to disconnect the power from any of the 2 or 3 systems of the Back or Forward valve group control, selects and automatically disconnects the power from the control system

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Claims (1)

Invention Formula A device for controlling a reversible valve converter containing a separate work unit of valve groups, the outputs of which are connected to the information inputs of the corresponding phase units of the valve groups Forward and Back, the outputs of which are connected to the inputs of the output switches of the corresponding 0 five five phase shifting channels, outputs connected to the ends of the respective primary windings of transformer potential dividers of the respective valve groups, the first and second additional keys, the power supply unit, the terminals for connecting the thyristor state sensors of the nonentical Forward and Back groups, characterized in that, in order to expand the functional capabilities, increasing reliability, reducing power consumption, two diode assemblies, two AND elements, two PUUi elements, two overcurrent protection units, and gidrel units from gidrelzieni are connected to the positive pole of the power supply unit 0, and the outputs to the beginnings of the respective primary windings of the transformer termination separators of the ventilation groups Forward and Back and the inputs of the corresponding additional switches, and the outputs of the latter through the diodes of the diode assemblies are connected to the outputs the corresponding output keys of the corresponding power groups, the control INPUT of the first additional key is connected to the output of the first OR element, the first input of which is connected to the output of the first element is And, and the second input is connected to the output of the block separate work valve-gx groups. The valve group Forward connected to the input of the phase displacement unit, the first input of the first element I is connected to the output of the second additional key, and the second input of the first element I is connected to the clamp of the thyristor sensor state of the Forward valve group, the control input of the second additional key is connected to the output of the second element 1 SHI, the first input of which is connected to the output of the second element I, and the second input is connected to the output of the separate work unit of the valve groups connected to the input of the phase shifting unit of the valve groups S Back, the first input of the second element I is connected to the output of the first auxiliary key, in the second mode, to the clamp of the thyristor state sensor of the Back group. 0 five 0 five 0 five