SU1086543A1 - Device for single-channel synchronous phase control of three-phase rectifier - Google Patents

Abstract

DEVICE FOR PHASE SYNCHRONOUS ODOOKANALNOGO UNRAVLE-; Nia gate TREHFAZNM CONVERTER with nulevEL4 terminal, comprising: a synchronization unit, the first and second phase-shifting cells, each of which consists of a shaper reference voltage, a reset key reference voltage and comparing the reference voltage with the voltage block voltage controls, two control triggers, two differentiation blocks,. a pulse distributor with three BXcneiMH, the first input of the first trigger through the first differentiating unit is connected to the output of the synchronization unit and the input of the first phase of the shifting cell, the second input of the first trigger is connected to the first1SH input of the second trigger and through the second differentiating unit connected to the output of the first phase-shifting cell , the first output of the second trigger is connected to the input of the second phase of the shifting cell, the output of the second phase-shifting cell is connected to the first input of the pulse distributor, and so on. In order to increase the reliability of the converter by limiting the opening angles of the blender valves, it is equipped with two comparison units, the source for setting the minimum and maximum control angles, the two-input OR element, the TR input element, two Three-input AND elements, and the pulse distributor is equipped with six add 1 and inputs, and a synchronization block with six additional outputs, each of which is connected to the corresponding additional inputs pulses, the first inputs of the comparison units are connected to the output 4 of the first voltage reference voltage generator (L C phase shifting cell, and the second inputs of the first and second comparison blocks are connected respectively to the sources of setting maximum and mini-control angles, the first input of the two-input element OR connected to the output of the second phase shift of the cell , the second input is connected to the output of the first block of comparison, the first input of the three-input, SL element I is connected to the second output of the first trigger, the second input is connected to The second output of the second trigger, the third input is connected to the output of the two-input element OR,: from the output of the first element I is connected to the BTOpto-i input of the pulse distributor, the first input of the second three-input element And is connected to the output of the second phase-shifting cell, the second input is connected to the first output of the first trigger , the third input is connected to the output of the second comparison unit, the output of the second element AND is connected to the third input of the pulse distributor, the inputs of the second three-input element OR are connected to the outputs of the impedance distributor sov,

Description

exit - with the second input of the second trigger.

2. Device pop. 1, characterized in that the synchronization unit contains three drivers, the inputs of which are intended to be connected to the terminals of the mains voltage, three AND two-input elements, three OR-NOT two-input elements and the OR three-input element, the inputs of the first AND element are connected to the outputs of the first and third drivers , the second element And - with the outputs of the first and second formers, the third element And - with the outputs of the second and third formers, output

elements And are connected to the appropriate but first, third and fifth additional outputs of the synchronization unit, the inputs of the first element OR are NOT connected to the outputs of the second and third drivers, the second element OR NOT with the outputs of the first and third drivers, the third element with the outputs of the first and the second drivers, the outputs of the elements OR are NOT connected respectively to the second, fourth and six additional outputs of the synchronization unit, the inputs of the element OR are connected to the outputs of the elements, and the output is connected to the output of the ka sync.

The invention relates to electrical engineering and can be used for control. AC-to-DC valve converters.

Devices are known for controlling the transducers and limiting control units l.

Control angles are limited by limiting the size of the control signal supplied to the input of the pulse-phase control system by imposing on the reference voltage in the right places pulses exceeding the amplitude of the reference voltage by the required number of times, as well as using logic circuits. The most technically advanced limitation devices using logic; schemes.

However, the known devices are not intended to limit the opening angles in single-channel control systems with a series connection of phase-shifting cells.

Closest to the invention is a device for single-channel synchronous phase control of a three-phase zero-output valve converter containing a synchronization unit, first and second phase-shifting cells, each of which consists of a reference voltage driver, a reference voltage reset switch and a reference voltage comparison device with control voltage, two control triggers, two differentiating blocks and a pulse distributor with three inputs, the first input of the first trigger through a first differentiator coupled to the output of the synchronization input of the first phase-shifting cell., a second input of the first flip-flop connected to the first

The second trigger input and through the second differentiation unit is connected to the output of the first phase shifter of the cell, the first output of the second trigger is connected to the input of the second phase shifting cell, the output of the second phase shifter of the cell is connected to the first input of the pulse distributor 2j.

A disadvantage of this device is the lack of limitation of angles.

C control.

The purpose of the invention is to increase the reliability of operation of the converter when controlled by a single-channel synchronous method with a series connection of phase-shifting cells.

0 by limiting the maximum and minimum opening angles.

The goal is achieved by the fact that the device for single-channel synchronous phase control

5 valve three-phase converter with zero output, containing a synchronization unit, the first and second phase-shifting: cells, each of which consists of a driver

0 of the reference voltage, the reset key of the reference voltage, and the block of comparison of the reference voltage with the control voltage, two control triggers, two differentiating blocks

5 and a pulse distributor with three inputs, the first input of the first trigger through the first differentiating unit is connected to the synchronization output and the input of the first phase-shifting cell, the second input of the first trigger is connected to the first input of the second trigger and through the second differentiating unit connected to the output of the first phase shifting unit , the first output of the second trigger is connected to the input of the second phase-shifting cell, the output of the second phase-shifting cell is connected to the first input of the pulse distributor by a gauge, equipped with two blocks comparison, the source of setting the minimum and maximum control angles, two-input element OR, three-input element OR, two three-input elements AND, the pulse distributor provided with six additional inputs and the synchronization unit six additional outputs, each of which is connected to the corresponding additional inputs of the distributor pulses, the first inputs of the comparison units are connected to the output of the forming of the reference voltage bodies. The first phase shift of the cell, and the two inputs of the first and the second comparison blocks are connected respectively to the sources of maximum and minimum control angles, the first input of the two-input element OR is connected to the output of the second phase-shifting cell, the second input is connected to the output of the first comparison unit, the first input of the three-input element And is connected to the second output of the first trigger, the second input is connected with the second output of the second trigger, the third input is connected to the output of the two-input element OR, the output of the first element AND is connected to the second input of the pulse distributor, the first input the second three-input element I is connected to the output of the second phase-shifting cell, the second input is connected to the first output of the first trigger, the third input is connected to the output of the second comparator unit, the output of the second element I is connected to the third input of the pulse distributor, the inputs of the second edge of the input element OR are connected with the outputs of the pulse distributor, and the output - with the second input of the second trigger. In addition, the synchronization unit contains three formers, the inputs of which are intended to be connected to the mains voltage terminals, three AND two-input elements, three, OR-NOT two-input elements and three OR input elements, the inputs of the first AND element are connected to the outputs of the first and third drivers, The second element And with the outputs of the first and second drivers, tert its element And with the outputs of the second and third drivers, the outputs of the elements And are connected respectively with the first, third and fifth additional outputs of the block synchronization, the inputs of the first element OR are NOT connected to the output of the second and third drivers, the second element OR NOT — to the outputs of the first and third drivers, the third element OR — NOT to the outputs of the first and second drivers, the outputs of the elements OR are NOT connected respectively with the second, fourth and sixth additional outputs of the synchronization unit, the inputs of the OR element are connected to the outputs of the OR-NOT elements, and the output is connected to the output of the synchronization unit. FIG. 1 shows a functional diagram of a device for single-channel synchronous phase control of a valve converter; in fig. 2 - diagrams, according to his work. The device contains (Fig. 1) synchronization unit I connected to the first phase-shifting cell 2, second phase-shifting cell 3, key 4 for resetting the reference voltage of the first phase shifting cell, driver of the first voltage voltage of the cell 5, comparison unit 6 of the reference voltage of the first phase shifters with control voltage, first trigger 7, second trigger 8, differentiating unit of the first trigger 9, differentiating unit 10 of the second trigger, distributor of control pulses 11, first comparison unit 12 constraints the maximum control angle, the second block of comparison 13 limiting the minimum control angle, the two-input element OR 14, the first three-input element AND 15, the second three-input element AND 16, the three-input element OR 17, respectively the first, second and third elements AND 18.19 and 20, the element OR 21, respectively, the first, second and third elements AND 22, 23 and 24, the element OR 25, respectively the first, second and third elements AND 26, 27 and 28, the element OR 29, the driver of logical signals of the anodic voltage 30, respectively, the first, second and third elements And 31 , 32 and 33 of the synchronization unit, the driver of the anode voltage logic signals 30, respectively; the second and third elements OR-NOT 34, 35 and 36 of the synchronization unit, a three-input element OR 37 of the synchronization unit. FIG. 2 denotes: Id, Ug, U phase mains voltage; ac, av, vs - signals of the time intervals of the anodic voltages corresponding to the first and third intervals of the anodic voltages of the discharge valves of the body; Bc, ac, aa — signals of the time intervals of the anode voltages corresponding to the BTojajM (middle) sections of the anode voltages of the converter valves; 0, the reference voltages of the first and second phase-shifting cells;), U ,, control voltages, setting the limit of the control angle to the maximum, setting the limit of the opening angle to a minimum; T signal at the second output of the first control trigger; Q, 5, the signals at the output of the first (maximum max) and second (minimum limit) comparison blocks; T is the signal at the second output of the second control trigger; U is the signal at the first input of the pulse distributor (at the output of the phase shift of the cell); U2 is the signal at the second input of the pulse distributor; U3 is the signal at the third input of the pulse distributor; Od, Ug, U ,. - control pulses at the outputs of the pulse distributor, respectively, for the valves of phases A, B, C. The device operates as follows. When the pulse disappears at the output of the synchronization unit 1 at the time of intersection of the sinusoids of the phase voltages, the signal at the input of the phase-shifting cell 2, switch 4 is opened, and the output voltage of the reference voltage 5 begins to form at the same time as the comparison voltage control voltage, on the first comparison block 12 of the reference voltage with setting the maximum angle limit and on the second comparison block 13 of the reference voltage with setting the minimum limit on the angle. Simultaneously, through the differentiating unit 9, the trigger edge 7 is switched over the falling front of the synchronization pulse, at the second output of which a logical signal appears indicating that the pulse shift angle of the first phase shift shift cell 2 is occurring. At the moment of equalization of the control voltage to the control voltage at the output of the comparison block 6, a signal appears, which through the differentiating block 10 enters the first input of the trigger 8 and switches it. On the second exit trigger. In Figure 8, a logical signal по appears, indicating that the second phase-shifting cell counts the shift angle of the control pulse. At the same time, at the first output of trigger 8, a logical signal O appears, which starts the second phase-shifting cell into operation. The same impulse from differentiating unit 10 is fed to the second input of the first control trigger 7 and switches it. At the first output of the trigger 7, a signal is received, and at the second, O, which provide information that the first phase shifter cell 2 does not read the shift angle of the control pulse. In this case, the reference voltage of the first phase-shifting cell 2 continues to be formed and supplied to comparison blocks 12 and 13. At the same time the reference voltage of the second phase-shifting cell 3 is equal, the control voltage at the output of the phase-shifting cell 3 appears, which is fed to the first input of the pulse distributor 11, to the first input of the two-input element OR 14 and to the first input of the second three-input element And 16. At the same time, the following operation options are possible. If at the time when the second phase-shifting cell 3 of the signal H appears, the signal at the output of the synchronization unit appears, then the reference voltage of the first phase-shifting cell is reset by key 4, the outputs of the comparison blocks 12 and 13 have the signals O, the element And is closed. The pulse from the cell 3 through the element OR 14 is fed to the third input of the first three-input element AND 15, the second input of which also contains the signal i from the second control trigger 8, the first input can be the signal O or. Thus, at the output of the element 15, in principle, there can be a signal, However, since at this time there is a mains voltage interval, corresponding to the middle of the range of variation of the control angle, i.e. there is an h signal at the second or fourth or sixth additional input, the control pulse is distributed: to the phase A valve with 1 at the second additional input of the distributor 11, to the phase B valve at the presence of h at the fourth additional input, to the phase C valve at availability on this additional input. In all cases, the signal from the output of the distributor through the OR element 17 is fed to the second input of the second trigger 8 and switches it. The signal from the first output of the trigger 8 resets the reference voltage of the second phase-shifting cell 3. If by the time the second phase-shifting signal appears at the input of the signal, the signal of the output of the synchronization unit is missing, the reference voltage continues to form and the comparison of the reference voltage with the voltage of the limiting voltage continues . At the moment when the reference voltage of the first phase-shifting cell is equal to the voltage of setting the minimum control angle at the output of the block of the stage 13, a pulse is generated, which is supplied to the third input of the AND 16 element. This pulse appears at the output of the element 16, i.e. at the third input of the pulse distributor 11, only if from the output of the second phase of the shifting cell 3 to the first input of the element and. 16 a pulse will arrive and from the first output of the trigger 7 to the second input I 16 also a pulse will arrive, i.e. information will be received that the first phase-shifting cell does not read the shift angle of the control pulse. If there are three input pulses at the output of the AND 16 element, a pulse is generated, which arrives at the third input of the pulse distributor 11. If, at this, the first or third or fifth additional input of the distributor appears, then the pulse from the third input passes through the output of the distributor to control the valve A or B, or C. A pulse output from the distributor 11 through the OR element 17 is fed to the input of the trigger 8, switches it. The signal at the output of the trigger 8 is fed to the input of the second phase-shifting cell and resets its reference voltage. If there is no signal at the output of the synchronization unit and there comes a moment of equality of the reference voltage of the first phase-shifting cell and the voltage of setting the maximum control angle, then at the output of the comparison unit 12 forms a signal that passes through the IL 14 element to the first input of the I 15 element. the output of the element 15 of the signal is only in the event that it is reported that the shift angle of the control pulse is greater than 120. Such information is the state of the phase shift cells. If both phase shifters. the cells are counted, then signals are output to the outputs of the flip-flops 7 and 8. These signals are sent to the first and. The second inputs of the element 15 and the output of the element 15 appear a signal that is fed to the second input of the pulse distributor 11. Depending on the presence of a signal at the first or second, or the third additional input of the pulse distributor 11, an output pulse is generated at the output of the distributor for valves of phase C or A, or B. The control output impulse passes through the OR element 17 and resets the trigger 8, which by its first output resets the reference voltage of the second phase-shifting cell 3. Xsignal output The second phase-shifting cell is formed better than the signal at the output of the comparison unit 12, then the control pulses are generated from the signal from the output of the phase-shifting cell 3 in the same way as described. The formation process also ends by resetting the trigger 8 and the reference voltage of the phase-shifting cell 3, and therefore at the second input of the element 15, the trigger signal 8 is prohibited from the second output. As a result, the signal at the output of the element 15 does not reappear. The connection of three inputs to the distributors to the cells of the distributor is carried out according to the principle of coincidence of the time interval and the signal at the input. So, for phase A, the first interval corresponds to the opening angle d. In this interval, the control pulse is generated only if the minimum opening angle is observed. Therefore, at the output of the element 18, the signal turns on only when there is a signal i at the first additional input and at the third input of the pulse distributor. The second interval corresponds to the opening angle from 60 ° to 120 °; There are no restrictions on this interval, therefore, at the output of element 19, if there is a signal at the first input of element 19 from the second auxiliary input and signal i at the second input of element 19 from the first input of the pulse distributor. In the third interval, corresponding to the opening angle from 120 to, the signal at the output of the element I 20 is wired. If there is a signal at the first input from the third additional input at the second input and a signal de element 4 from the second input of the pulse distributor 11. The rest of the pulse distributor cells work similarly . The first time interval for the first cell is the third time interval for the third cell, the first time interval for the second cell is the third time interval for the gate cell of the previous phase, i.e. the first cell, and the first interval of the third cell is the third time interval for the second cell. The forming signal at the output of any element AND the distributor cell passes to the output of the distributor through the element OR of the given cell.

Thus, the proposed device provides a penetrating

reliability of the converter; by limiting the opening angles using the reference voltage of the phase-shifting device and the general combination pulse distributor.

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Claims (2)

DEVICE FOR SINGLE-CHANNEL SYNCHRONOUS PHASE CONTROL OF A VENTILED THREE-PHASE CONVERTER with a zero output, containing a synchronization unit, the first and second phase-shifting cells, each of which consists of a voltage shaper, a voltage reference reset key and two reference voltage comparisons and two control comparisons differentiating blocks, a pulse distributor with three inputs, and the first input of the first Trigger is connected to the output through the first differentiating block m of the synchronization unit and the input of the first phase-shifting cell, the second input of the first trigger is connected to the first input of the second trigger and through the second differentiating unit is connected to the output of the first phase-shifting cell, the first output of the second trigger is connected to the input of the second phase-shifting cell, the output of the second phase-shifting cell is connected to the first input pulse distributor, which is due to the fact that, in order to increase the reliability of the converter by limiting the opening angles of the converter valves, it is equipped with two I have comparison units, a source for setting the minimum and maximum control angles, a two-input OR element, a three-input OR element, two three-input AND elements, and the pulse distributor is equipped with six additional inputs, and the synchronization block has six additional outputs, each of which is connected to the corresponding additional inputs of the pulse distributor , the first inputs of the comparison units are connected to the output of the former of the reference voltage of the first phase-shifting cell, and the second inputs of the first of the second and second comparison units are connected respectively to the sources for setting the maximum and minimum control angles, the first input of the two-input element OR is connected to the output of the second phase-shifting cell, the second input is connected to the output of the first comparison unit, the first input of the three-input _ element And is connected to the second output of the first trigger, the second input is connected to the second output of the second trigger, the third input is connected to the output of the two-input element OR, the output of the first element AND is connected to the second input of the pulse distributor s, the first input of the second three-input element And is connected to the output of the second phase-shifting cell, the second input is connected to the first output of the first trigger, the third input is connected to the output of the second comparison unit, the output of the second element And is connected to the third input of the pulse distributor, the inputs of the second three-input element OR are connected . with outputs of the pulse distributor, SUn 1086543 to the exit - with the second input of the second trigger. 2. The device pop. 1, characterized in that the synchronization unit contains three drivers, the inputs of which are designed to connect to the mains voltage terminals, three two-input AND elements, three two-input OR-NOT elements and a three-input OR element, the inputs of the first AND element are connected to the outputs of the first and third formers, the second element And - with the outputs of the first and second formers, the third element And - with the outputs of the second and third formers, the outputs of the elements And are connected respectively with the first, third and fifth additional outputs odes of the synchronization unit, the inputs of the first element ORINE are connected to the outputs of the second and third formers, the second element OR — NOT - with the outputs of the first and third formers, the third element OR-HE - with the outputs of the first and second formers, the outputs of the OR-HE elements are connected • respectively with the second, fourth and sixth additional outputs of the synchronization block, the inputs of the OR element are connected to the outputs of the elements OR — NOT, and the output is connected to the output of the synchronization block.