SU1166214A1 - Device for checking system for controlling thyristor converter - Google Patents

Description

It is connected to the exit of the first comparison unit, and the outputs of the first 1166214 second trackerb are connected to and to the third inputs of the display unit.

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The invention relates to power converter technology, in particular, to devices for monitoring and detecting faults in the system for controlling thyristor frequency converters, and can be used in the process of their adjustment and operation.

A device comprising a clock setting unit, a matching unit, a control unit, a comparison unit, an adder, signal conditioners, keys and a display unit 1 J is known.

A disadvantage of this device is the impossibility of determining the type and place of failure, which reduces the reliability of the control.

The closest to the invention according to the Technical Entity and the achieved result is a device for monitoring a control system of a thyristor converter, containing a control unit, information inputs for connecting to the outputs of the control object, the first output connected to the input of the threshold unit, and the second outputs to the first inputs of the unit display, the first one-shot, the input connected to the input of the second one-shot, the output of which is connected to the first input of the first comparison unit, the third one brator, the second comparison unit and the first flip-flop, a first input with the output of the third soedinenny monostable. The device allows you to control the pulse duration and phase shift between the pulses of the object channels {, 2j,

A disadvantage of the known device is the low reliability of the control, since the phase shift between the pulses of one channel and the appearance of the excess pulse is not monitored.

The purpose of the invention is to increase the reliability of the control.

The goal is achieved by the fact that the device for controlling a thyristor converter control system contains a control unit with information inputs intended to be connected to the outputs of the control object, the first output connected to the input of the threshold unit, and the second outputs from the first inputs of the display unit, the first one-shot, output connected to the input of the second one-shot, the output of which is connected to the first input of the first comparison unit, the third one-shot, the second comparison block and the first trigger, The first input connected to the output of the third one-shot, the first and second pulse drivers, the fourth one-shot and the second trigger, the control block. Contains a pulse generator, a counter, a decoder, the first, second and third switches, and the input of the pulse generator is designed to be connected to the output of the command setter. The control, the generator output is connected to the counter input of the counter and the first information input of the third switch, the counter outputs are connected to the inputs of the decoder and to the address inputs of the first and the second switch, the information inputs of which are intended to be connected to the outputs of the converter control system, the output of the switch is the first output of the control unit, the output of the second switch is connected to the second information input of the third switch, the address inputs of which are intended to be connected to the outputs of the command setter. Mode, outputs decoder are the second outputs of the control unit, and the output

The third switch is the third output of the control unit, the output of the threshold unit is connected to the inputs of the first and second pulse shapers and the second input of the AI dicate unit, the first pulse shaper input is connected to the second input of the first comparator unit and to the input of the third one-oscillator, the output of which is connected to the input the fourth one-shot, the output of which is connected to the first INPUT of the second comparison unit, the output connected to the second input of the first trigger, and the second input connected to the output of the second The pulse generator, the third output of the control unit is connected to the input of the first one-shot, the output of which is connected to the first input of the second trigger, the second input of which is connected to the output of the first comparison unit, and the outputs of the first and second triggers are connected to the third input of the display unit.

Figure 1 shows the functional diagram of the device for monitoring the control system of the thyristor converter in Figure 2 a functional diagram of the control unit; on fig.Z - timing diagrams of work, the proposed device in the first and second modes.

The device contains the control unit 1, the first output 2 of the control unit, the outputs 3 of the monitored object, the threshold unit 4, the second outputs 5 of the control unit 1, the display unit 6, the third output 7 of the control unit 1, the first single vibrator 9 (minimum phase shift), the second single vibrator 9 (tolerance for phase shift spread), second trigger 10, first comparison block 11, first driver 12 pulses (on the leading edge), third single vibrator 13 (minimum pulse duration), fourth single vibrator 14 (tolerance on spread of pulse c) first flip-flop 15, vtoroyformirovatel 16 (on the trailing edge of the pulses), a second comparing unit 17.

The control unit 1 contains the generator 18 pulses, the counter 19, the first 20 and second 21 switches, the decoder 22, the third switch 23.

The device works as follows.

On the Control command, the control unit 1 (Fig. 1), through the first output 2, alternately connects the outputs 3 of the monitored object to the input of the threshold unit 4, connects the corresponding cells of the display unit 6 via the second outputs 5, and through the third output 7 starts the one-shot 8, adjusted to the minimum value of the phase shift angle.

The device controls four parameters: being within the tolerances of the amplitude of the monitored pulses, monitoring the phase shift between the pulses of the object channels, controlling the phase shift between the pulses of one channel, and controlling the duration of the pulses. Therefore, the Q inputs of the flip-flops 10 and 15, and the threshold block 4, i.e., are connected to the corresponding inputs of the display unit. the display unit 6 highlights the number of the object channel being monitored and the signal is Good or Faulty for all monitored parameters.

In the first mode, the device controls the amplitude, the phase shift between the pulses of the object channels and the pulse duration, and in the second mode it controls the amplitude, the phase shift between the pulses of one channel and the pulse duration.

In the first mode, the device operates as follows.

When switching to the channel control, the monitored pulses through the control unit 1 are fed to the input of the threshold unit 4. If the monitored pulse arrives and its amplitude is within tolerances, the threshold unit is triggered and the signal is displayed in the display unit. If the amplitude of the monitored impulses is outside the tolerances or there was a pulse skip (in the diagram, as indicated by the dotted line), the threshold unit does not work, and the Faulty signal is transmitted in the display unit.

The phase shift control is carried out as follows. At time t (Fig. 3), the pulses

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The n-1 channel (present in relation to the h-th) starts the first one-shot 8, tuned to the minimum phase shift. At the end of its operation, at the time t, the second one-shot 9 is started, adjusted for the tolerance on the phase shift, the second trigger 10 is set to Good, and one of the inputs of the comparison block 11 is opened. On the leading edge of the monitored pulse of the nth channel at time t, a short pulse is formed, at the output of the first driver 12. If this pulse is formed during the operation of the second one-oscillator 9, then a signal is generated at the output of the first comparison unit 11, which does not change the state the second trigger 10, and in block 6 of the indications the signal is displayed properly. If a short pulse at the leading edge is formed before or after the end of the second one-shot 9, then no signal is generated at the output of the first comparison block 11, which causes the second trigger 1-0 to switch to the Faulty position (time tp). The signal is also displayed in the display unit Faulty, i.e. phase shift between channel pulses is out of range. The control of the pulse duration begins at time t. On the leading edge of the monitored pulse, the third one-shot 13 is started, built on the value of the minimum-permissible pulse duration. At the end of its operation, at the time tj, the fourth one-shot 14 is started, tuned to the tolerance on the spread of the pulse duration, the first trigger 15 is set to Good, and one of the inputs of the second comparison block 17 opens. If a short pulse on the falling edge is formed during the operation of the one-shot 14 (time t), the output of the comparison block 17 is generated by the lia signal, which does not change the state of the first trigger 15. If the pulse on the falling edge of the monitored pulse is generated before or after the end of the fourth one-shot 14 or controlled662146

The pulse did not pass at all, the first Trigger 15 is set to the Faulty position (time t), which is displayed in the display unit.

The operation of the device in the second mode is similar (fig.Z). The difference is that the measurement of the phase shift of the channel

0 occurs relative to the pulses of the generator 18 of the control unit 1 (Fig. 2) i.e. In this mode of operation, the first one-shot 8 is triggered by pulses from the generator 18, which

5 passes through the switch 23 and the output 7 of the control unit 1, and the monitored pulses through the switch 20 and the output 2 of the control unit 1 arrive at the input of the threshold

0 block 4.

The control unit 1 (Fig. 2) works as follows.

Control command starts the generator 18 pulses, the output

5, the signals of which are fed to the counting input of the counter 19. A certain combination of pulses from the outputs of the counter goes to the address inputs of the first 20 and second 21 switches, to the informational inputs of which the outputs 3 of the monitored object are connected. The decoder 22 decodes the control number of my channel. This information, via the second outputs 5 of the control unit 1, enters the indication unit, where a certain indication cell lights up. Depending on the combination on the address inputs, the first switch 20 connects one of the monitored by the first output 2 of the control unit to the input of the threshold unit.

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In the first mode, the first one-channel 8 is started by pulses of the n-1 channel that pass through the switches 21 and 23 of the control unit, and the monitored pulses of the n-th channel arrive at the input of the threshold 0 unit 4 through the switch 20 and. control unit output 2. Known elements of microelectronics 5 K155KP5, K155KP7 can be used as switches 20,21 and 23 of the control unit.

The display unit 6 has the elements of dy and board. After completing the check, the display shows up. The fault corresponds to the number of the faulty channel and the type of fault. Thus, the proposed device for monitoring the control system of the thyristor converter allows you to automatically control the amplitude, duration, phase shift between the pulses of the object channels, the phase shift between the pulses of one channel and detect the appearance of an excess pulse. The diagnostics time is reduced from 11.5–2 h to 1–2 min per controlled unit of the inverter control system, i.e. control of the entire conversion will be no more than 15 minutes. Save time with PemuHl PemunZ

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7 148 em on average 1.5 hours per converter. Therefore, by reducing the monitoring time, the proposed device, in the process of setting up and operating converters, eliminates the use of non-specialized expensive equipment (oscillographs, testers, frequency meters, pulse generators, etc.), which cost an average of not less than 2000 rubles. . The cost of the proposed control device CJSC rub. saving equipment cost - 1700 rubles.) The control device is easy to use, it does not require highly qualified specialists to maintain it.

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Claims (1)

(-57) DEVICE FOR MONITORING THE SYSTEM OF CONTROL OF A THYRISTOR CONVERTER, containing a control unit, information inputs · designed to connect to the outputs of the monitoring object, the first output connected to the input of the threshold of the new unit, and the second outputs to the first inputs of the display unit, the first one-shot, the output is connected to the input of the second one-shot, the output of which is connected to the first input of the first comparison unit, the third one-shot, the second comparison unit and the first trigger, the first input connected to the output one single vibrator, characterized in that, in order to increase the reliability of control, the first and second pulse shapers, the fourth one-shot and the second trigger are introduced into it, and the control unit contains a pulse generator, counter, decoder first, second and third switches, and the pulse generator input it is designed to connect to the control unit output of the control, the generator output is connected to the counter input of the counter and to the first information input of the third switch, the counter outputs are connected to the decryption inputs and with the address inputs of the first and second switches, the information inputs of which are designed to connect to the outputs of the converter control system, the output of the first switch is the first output of the ynpaBneHHHj block, the output of the second switch is connected to the second information input of the third switch, the address inputs of which are designed to connect to the outputs command setter Mode, the decoder outputs are the second outputs of the control unit, and the output of the third switch is the third output of the control unit The output of the threshold unit is connected to the inputs of the first and second pulse shapers and to the second input of the display unit, the first pulse shaper is connected to the second input of the first comparison unit and to the output of the third one-shot, the output of which is connected to the input of the fourth one-shot, the output of which is connected to the first the input of the second comparison unit, the output connected to the second input of the first trigger, and the second input connected to the output of the second pulse shaper, the third output of the control unit is connected input of the first monostable multivibrator, whose output is connected to the first input rtorb.go flop, a second input kotoSU. "1166214 cerned connected to the first output of the second flip-flops are connected to the comparator, and the outputs of the first and third inputs of the indication unit.