CN213213179U - Anti-interference electric control system of frequency converter - Google Patents
Anti-interference electric control system of frequency converter Download PDFInfo
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- CN213213179U CN213213179U CN202022060429.3U CN202022060429U CN213213179U CN 213213179 U CN213213179 U CN 213213179U CN 202022060429 U CN202022060429 U CN 202022060429U CN 213213179 U CN213213179 U CN 213213179U
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Abstract
The utility model relates to an anti-shaking electric control system of a frequency converter, belonging to the technical field of anti-shaking electric control systems of frequency converters; the technical problem to be solved is as follows: the improvement of the structure of the anti-interference electric control system of the frequency converter is provided; the technical scheme for solving the technical problems is as follows: the anti-interference control device comprises an anti-interference control unit, a charging module, a standby power supply unit and a voltage stabilizing and filtering module, wherein the output end of the anti-interference control unit is connected in parallel with a direct current bus of the frequency converter and is used for detecting the voltage on the direct current bus of the frequency converter and switching the power supply mode of the frequency converter; the input end of the anti-interference electric control unit is connected with the power supply output end of the standby power supply unit through a wire, and the power supply input end of the standby power supply unit is connected with the charging module and the voltage-stabilizing filtering module through wires; the utility model discloses be applied to the converter electric wire netting and shake the electricity.
Description
Technical Field
The utility model relates to an anti-electric-dazzling control system of converter belongs to the anti-electric-dazzling control system technical field of converter.
Background
The frequency converter is an electric energy control device which converts a power frequency power supply into another frequency by utilizing the on-off action of a power semiconductor device. In industrial control, a low-voltage inverter is often used to control the rotation speed of a motor to meet the requirements of energy saving and control.
The coal chemical industry enterprises have a lot of important equipment and all need variable frequency speed governing, because its production technology continuity is strong, causes variable frequency equipment short-term shutdown when the electric wire netting "shakes the electricity", and whole process flow will break off, brings huge economic loss for the enterprise. Meanwhile, in the middle working process of the low-voltage frequency converter, the power grid can be subjected to power-shaking or power-down, and the short-time undervoltage formed by power grid power-shaking causes the frequency converter to trip and stop, so that production is influenced.
When the power grid is in interference with electricity, the frequency converter tripping caused by interference with electricity is solved by generally canceling the low-voltage protection setting of the frequency converter and setting the frequency converter to be in an undervoltage recovery restart mode, but the undervoltage recovery restart easily causes the frequency converter to have overcurrent protection action, and the restart function has low reliability, so that the action rejection condition is easily caused. Therefore, it is required to provide a control system with high reliability, which can effectively solve the problem of anti-interference electricity of the frequency converter.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome not enough that exists among the prior art, the technical problem that will solve is: the improvement of the hardware structure of the interference control system of the frequency converter is provided.
In order to solve the technical problem, the utility model discloses a technical scheme be: an anti-interference electric control system of a frequency converter comprises the frequency converter and an anti-interference electric control device, wherein the anti-interference electric control device comprises an anti-interference electric control unit, a charging module, a standby power supply unit and a voltage stabilizing and filtering module, and the output end of the anti-interference electric control unit is connected to a direct current bus of the frequency converter in parallel and is used for detecting the voltage on the direct current bus of the frequency converter and switching the power supply mode of the frequency converter;
the input end of the anti-interference electric control unit is connected with the power output end of the standby power supply unit through a wire, the power input end of the standby power supply unit is connected with the charging module and the voltage-stabilizing filtering module through wires, the charging module is used for charging the standby power supply unit when no interference occurs, the voltage-stabilizing filtering module is used for realizing harmonic filtering and voltage-stabilizing treatment on the accessed alternating current, and the treated direct current is input to the anti-interference electric control unit.
The anti-interference electric control device also comprises a battery polling instrument and a monitoring alarm module, wherein the battery polling instrument is arranged on the standby power supply unit and is used for detecting the battery operation parameters in the standby power supply unit;
the monitoring alarm module is respectively connected with the anti-interference electric control unit, the charging module and the battery patrol instrument through leads and is used for monitoring the running condition of each unit module in the anti-interference electric control device and giving an alarm for abnormal conditions.
The anti-interference electric control unit comprises a current-voltage difference control unit and a diode module, the current-voltage difference control unit comprises a thyristor V1, a voltage difference controller and a voltage relay YJ1, an anode A of the thyristor V1 is connected with the anode of the standby power supply unit through a lead, a cathode K of the thyristor V1 is connected with the cathode of a direct-current bus of the transformer through a lead, a gate G of the thyristor V1 is connected with the output control end of the voltage difference controller through a lead, and the voltage difference controller controls the on and off of the gate G of the thyristor V1 through the judgment of the voltage on the direct-current bus of the frequency converter;
the diode module is used for realizing the protection against the electric-dazzling control unit.
The coil of the voltage relay YJ1 is connected IN parallel with the power input end of the frequency converter 1, and the contact of the voltage relay YJ1 is connected with the IN + and IN-terminals of the current-voltage difference control unit through a lead.
The two ends of the thyristor V1 are connected with a contact KM7.1 of a bypass contactor KM7 in parallel, one end of a coil KM7.2 of the bypass contactor KM7 is connected with an NC terminal of a current-voltage difference control unit, the other end of the coil KM7.2 of the bypass contactor is connected with a power supply, and the bypass contactor KM7 is used for enabling the frequency converter to be disconnected from a standby power supply unit to supply power when the voltage of a power grid is recovered to be normal and switching to be mains supply.
And the display screen is connected with the anti-interference electric control unit through a wire and is used for displaying the power failure time of the frequency converter, the power supply recovery time and the supporting time of the standby power supply unit.
The standby power supply unit is specifically a storage battery pack, and the storage battery pack comprises a plurality of storage batteries connected in series.
The model of the charging module is TH600X10ZZ, and the model of the voltage-stabilizing filtering module is TH600X05 ZZ.
The utility model discloses beneficial effect for prior art possesses does: the utility model provides an anti-electric-dazzling control system of converter, through anti-electric-dazzling control unit that connects in parallel on the direct current bus at the converter, voltage detects on the converter direct current bus, realize the judgement to the electricity dazzling condition through the judgement to detection voltage, when taking place the electricity dazzling, the control thyristor switches on, the power supply mode who makes the converter switches into stand-by power supply unit from the commercial power, thereby this kind of phenomenon of short-term parking of converter when having reduced the electricity dazzling and taking place, once the electricity dazzling accident has been avoided, the time of driving again of whole process flow has been saved, economic loss has greatly been reduced, the work efficiency of coal chemical industry enterprise has been improved.
Drawings
The present invention will be further explained with reference to the accompanying drawings:
fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic circuit structure diagram of the electric dazzling control device of the present invention;
fig. 3 is a schematic diagram of the terminal wiring of the current differential pressure control unit of the current interference control device of the present invention;
fig. 4 is a flow chart of the method for detecting a power failure according to the present invention;
fig. 5 is a flowchart of a method for detecting a power failure in an embodiment of the present invention;
fig. 6 and 7 are usage effect diagrams when a power-off condition occurs in the embodiment of the present invention;
fig. 8 is a display diagram of the power-shaking action information recorded on the display screen of the anti-power-shaking control device in the embodiment of the present invention.
In the figure: the device comprises a frequency converter 1, an anti-interference electric control device 2, an anti-interference electric control unit 3, a charging module 4, a standby power supply unit 5, a voltage stabilizing and filtering module 6, a frequency converter direct current bus 11, a current and pressure difference control unit 31 and a diode module 32.
Detailed Description
As shown in fig. 1 to 8, the utility model relates to an anti-interference electric control system of frequency converter, including frequency converter 1, still include anti-interference electric control device 2, anti-interference electric control device 2 includes anti-interference electric control unit 3, charging module 4, stand-by power supply unit 5, steady voltage filter module 6, the output of anti-interference electric control unit 3 connects in parallel on frequency converter direct current bus 11 for realize detecting the voltage on frequency converter direct current bus 11 and switch the power supply mode of frequency converter 1;
the input end of the anti-interference electric control unit 3 is connected with the power output end of the standby power supply unit 5 through a wire, the power input end of the standby power supply unit 5 is connected with the charging module 4 and the voltage-stabilizing filtering module 6 through wires, the charging module 4 is used for charging the standby power supply unit 5 when no interference occurs, the voltage-stabilizing filtering module 6 is used for realizing harmonic filtering and voltage-stabilizing processing on the accessed alternating current, and inputting the processed direct current to the anti-interference electric control unit 3.
The anti-interference electric control device 2 further comprises a battery patrol instrument and a monitoring alarm module, wherein the battery patrol instrument is arranged on the standby power supply unit 5 and is used for detecting battery operation parameters in the standby power supply unit 5;
the monitoring alarm module is respectively connected with the anti-interference electric control unit 3, the charging module 4 and the battery patrol instrument through leads and is used for monitoring the running condition of each unit module in the anti-interference electric control device 2 and giving an alarm for abnormal conditions.
The anti-interference electric control unit 3 comprises a current-voltage difference control unit 31 and a diode module 32, the current-voltage difference control unit 31 comprises a thyristor V1, a voltage difference controller and a voltage relay YJ1, an anode A of the thyristor V1 is connected with the anode of the standby power supply unit 5 through a lead, a cathode K of the thyristor V1 is connected with the cathode of the transformer direct-current bus 11 through a lead, a gate G of the thyristor V1 is connected with the output control end of the voltage difference controller through a lead, and the voltage difference controller controls the on and off of the gate G of the thyristor V1 through the judgment of the voltage on the direct-current bus of the frequency converter 1;
the diode module 32 is used to achieve protection against the brown-out control unit 3.
The coil of the voltage relay YJ1 is connected IN parallel with the power input end of the frequency converter 1, and the contact of the voltage relay YJ1 is connected with the IN + and IN-terminals of the current-voltage difference control unit 31 through a lead.
Two ends of the thyristor V1 are connected with a contact KM7.1 of a bypass contactor KM7 in parallel, one end of a coil KM7.2 of the bypass contactor KM7 is connected with an NC terminal of the current-voltage difference control unit 31, the other end of the coil KM7.2 of the bypass contactor is connected with a power supply, and the bypass contactor KM7 is used for disconnecting the frequency converter 1 from the standby power supply unit 5 to supply power and switching the power supply to commercial power when the voltage of a power grid is recovered to be normal.
And a display screen is arranged on the front face of the shell of the anti-interference electric control device 2 and is connected with the anti-interference electric control unit 3 through a wire for displaying the power failure time and the power restoration time of the frequency converter 1 and the supporting time of the standby power supply unit 5.
The standby power supply unit 5 is specifically a storage battery pack, and the storage battery pack includes a plurality of storage batteries connected in series.
The model of the charging module 4 is TH600X10ZZ, and the model of the voltage-stabilizing filtering module 6 is TH600X05 ZZ.
A method for detecting the interference of the frequency converter comprises the following steps:
the method comprises the following steps: the power supply of the frequency converter 1 and the anti-interference electric control device 2 is started to ensure that the frequency converter 1 normally operates, and the charging module 4 charges the standby power supply unit 5;
step two: when the anti-interference electric control unit 3 detects that the voltage of the direct current bus 11 of the frequency converter is lower than a set range, judging that interference electricity occurs, and turning to the third step; when the anti-interference electric control unit 3 detects that the voltage of the direct-current bus 11 of the frequency converter is in a normal range, judging that the commercial power is normal, and turning to the first step;
step three: the anti-interference electric control unit 3 controls the gate level G of the thyristor V1 to be conducted, and at the moment, the frequency converter 1 is in a direct current supporting state, namely, the frequency converter 1 supplies power through the standby power supply unit 5;
step four: when the anti-interference electric control unit 3 detects that the voltage of the direct-current bus 11 of the frequency converter is higher than the set range, the commercial power is judged to be recovered, and the step five is carried out; when the anti-interference electric control unit 3 detects that the voltage of the direct current bus 11 of the frequency converter is lower than a set value, judging that the commercial power is not recovered, and turning to the step six;
step five: the anti-interference electric control device 2 quits the operation to complete the primary interference protection;
step six: and controlling the frequency converter 1 to stop within a set time.
In the second step, the voltage of the direct current bus 11 of the frequency converter is set to be less than or equal to 500V;
the voltage setting range of the direct current bus 11 of the frequency converter in the fourth step is more than 500V;
in the sixth step, the set time of the frequency converter 1 is 5-15 minutes.
The utility model provides an anti-electricity-dazzling control system of converter can be applied to the converter of liquid oxygen pump on, right according to following embodiment the utility model discloses an anti-electricity-dazzling control system and electric dazzling judgement method carry out further explanation.
In the embodiment, according to 4 sets of liquid oxygen pumps of the air separation device, the rated voltage of a motor is 380V, the rated power is 85KW, the rated current is 170A, and the frequency is 82 Hz; the total power of a liquid oxygen pump of the air separation device is 340KW, the anti-interference control device 2 with the power of 400KW can meet the requirement according to the field situation, the backup time of the frequency converter 1 during interference is set for 5min, the judgment voltage of the direct current bus 11 of the frequency converter is set to be 500V, interference of electricity is judged to occur when the judgment voltage is lower than 500V, and the judgment voltage is higher than 500V to judge that the commercial power is normal.
The anti-interference electric control device 2 mainly comprises a charging module 4, a standby power supply unit 5, namely a storage battery pack, an intelligent control system, an anti-interference electric control unit 3 (comprising a thyristor, a differential pressure controller, a diode module and the like), a battery polling instrument and a monitoring alarm module. As shown in FIG. 3, in normal operation, QF11 is closed, the frequency converter 1 is powered by the service low-voltage AC bus, and the frequency converter 1 controls the rotating speed of the motor according to a 4-20mA signal given by the instrument DCS. At this time, the breakers QF1, QF2, QF3, QF4, QF5, QF6 and the battery fuse IN the anti-interference electric control device 2 are all closed, the battery pack is float charged by the charging module 4, the anti-interference electric control unit 3 judges that the frequency converter 1 normally operates, the terminals IN + and IN-on the current and voltage difference control unit 31 sample the alternating voltage of the frequency converter 1 to judge that the voltage is normal and no fault signal exists, the thyristor V1 IN the current and voltage difference control unit 31 is IN a cut-off state and has no direct current output, and the anti-interference electric control device 2 is IN a hot standby state.
When the power grid of the chemical plant is IN a 'power interference' state, the terminals IN + and IN-of the current-voltage difference control unit 31 detect that the voltage of the power grid is reduced (the voltage of the commercial power is lower than 353V), the terminals DC + and DC-of the current-voltage difference control unit 31 detect that the voltage of a direct-current bus is less than or equal to 500V, at the moment, the current-voltage difference control unit 31 controls the conduction of the thyristor V1 through the terminal A, G, K, the conduction time is less than or equal to 100 microseconds, the frequency converter 1 is powered by converting the service power into a direct-current support.
When the chemical service power is recovered, the terminals IN + and IN-of the current-voltage difference control unit 31 detect that the voltage of the power grid is recovered to be normal, the current-voltage difference control unit 31 controls the attraction of the contact KM7.1 of the bypass contactor KM7 connected with the thyristor V1 IN parallel through the terminals NO and NC, at the moment, the current-voltage difference control unit 31 controls the thyristor V1 to be closed, then the terminals NO and NC of the current-voltage difference control unit 31 are disconnected, the power supply of the battery is disconnected, the frequency converter 1 is converted into the service power, and the liquid oxygen pump still keeps continuous operation IN the process. The anti-interference control device 2 is again switched to the hot standby state. After each action, the anti-shaking control device 2 displays and records the power failure, the power supply recovery time and the support time through the display screen, so that the action records are conveniently inquired.
Fig. 6 is a recording diagram of power-shaking operation data of the liquid oxygen pump frequency converter of the present embodiment in which ABC three-phase short circuit occurs at 10KV I stage, three-phase voltage drops to 800V, and failure time reaches 82ms, fig. 7 is a recording diagram of power-shaking operation data of the liquid oxygen pump frequency converter of the present embodiment in which ABC three-phase short circuit occurs after B phase short circuit occurs at 110KV II stage, and failure time reaches 61ms, and the power-shaking operation data is obtained according to the operation process data shown in fig. 6 and 7, and after the anti-power-shaking control device 2 is added, power-shaking is performed for the last 2 times (fig. 6 and 7) because the anti-power-shaking control device 2 operates correctly (fig. 8), thereby ensuring continuous and stable operation of the liquid oxygen pump, no.
The utility model discloses there is great application in coal chemical industry enterprise, has a lot of important equipment at coal chemical industry enterprise and all needs variable frequency speed governing, because its production technology continuity is strong, causes the short-term parking of variable frequency equipment during electric wire netting "electric dazzling", and whole process flow will break off, brings huge economic loss for the enterprise. The provision of the anti-sloshing control means 2 solves this problem exactly. The coal chemical industry is a continuous process, one-time electricity interference accidents are avoided, the re-starting time of at least 5 hours can be saved, the oil product yield per hour of a plant area is 16 tons, the yield per ton is 2000 yuan, the yield per hour of urea is 50 tons, and the direct economic loss per ton is 56 ten thousand yuan.
About the utility model discloses what the concrete structure need explain, the utility model discloses a each part module connection relation each other is definite, realizable, except that the special explanation in the embodiment, its specific connection relation can bring corresponding technological effect to based on do not rely on under the prerequisite of corresponding software program execution, solve the utility model provides a technical problem, the utility model provides a model, the connection mode of parts, module, specific components and parts that appear all belong to the prior art such as the published patent that technical staff can acquire before the application day, published journal paper, or common general knowledge, need not to describe in detail for the technical scheme that the present case provided is clear, complete, realizable, and can be according to this technical means or obtain corresponding entity product.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (8)
1. An anti-interference electric control system of a frequency converter comprises the frequency converter (1), and is characterized in that: the anti-interference control device (2) comprises an anti-interference control unit (3), a charging module (4), a standby power supply unit (5) and a voltage stabilizing and filtering module (6), wherein the output end of the anti-interference control unit (3) is connected to a direct current bus (11) of the frequency converter in parallel and is used for detecting the voltage on the direct current bus (11) of the frequency converter and switching the power supply mode of the frequency converter (1);
the input of anti-interference electric control unit (3) links to each other through the power output of wire with stand-by power supply unit (5), the power input of stand-by power supply unit (5) links to each other through wire and charging module (4), steady voltage filter module (6), charging module (4) are used for charging stand-by power supply unit (5) when not shaking electricity, steady voltage filter module (6) are used for realizing carrying out harmonic filtering and voltage stabilization to the alternating current of inserting, and direct current after will handling inputs to anti-interference electric control unit (3).
2. The frequency converter anti-interference control system according to claim 1, wherein: the anti-interference electric control device (2) further comprises a battery patrol instrument and a monitoring alarm module, wherein the battery patrol instrument is arranged on the standby power supply unit (5) and is used for detecting battery operation parameters in the standby power supply unit (5);
the monitoring alarm module is respectively connected with the anti-interference electric control unit (3), the charging module (4) and the battery patrol instrument through leads and is used for monitoring the running condition of each unit module in the anti-interference electric control device (2) and giving an alarm for abnormal conditions.
3. The frequency converter anti-interference control system according to claim 2, wherein: the anti-interference electric control unit (3) comprises a current-voltage difference control unit (31) and a diode module (32), the current-voltage difference control unit (31) comprises a thyristor V1, a voltage difference controller and a voltage relay YJ1, an anode A of the thyristor V1 is connected with the positive electrode of the standby power supply unit (5) through a lead, a cathode K of the thyristor V1 is connected with the negative electrode of a direct-current bus (11) of the frequency converter through a lead, a gate G of the thyristor V1 is connected with the output control end of the voltage difference controller through a lead, and the voltage difference controller controls the on and off of the gate G of the thyristor V1 through the judgment of the voltage on the direct-current bus of the frequency converter (1);
the diode module (32) is used for protecting against the electric-dazzling control unit (3).
4. The frequency converter anti-interference control system according to claim 3, wherein: the coil of the voltage relay YJ1 is connected IN parallel with the power input end of the frequency converter (1), and the contact of the voltage relay YJ1 is connected with the IN + and IN-terminals of the current-voltage difference control unit (31) through a lead.
5. The frequency converter anti-interference control system according to claim 4, wherein: the two ends of the thyristor V1 are connected with a contact KM7.1 of a bypass contactor KM7 in parallel, one end of a coil KM7.2 of the bypass contactor KM7 is connected with an NC terminal of a current-voltage difference control unit (31), the other end of the coil KM7.2 of the bypass contactor is connected with a power supply, and the bypass contactor KM7 is used for enabling the frequency converter (1) to disconnect a standby power supply unit (5) for supplying power and switch to mains supply when the voltage of a power grid is recovered to be normal.
6. The frequency converter anti-interference control system according to claim 5, wherein: and a display screen is arranged on the front face of the shell of the anti-interference electric control device (2), and the display screen is connected with the anti-interference electric control unit (3) through a wire and used for displaying the power failure and power restoration time of the frequency converter (1) and the support time of the standby power supply unit (5).
7. The frequency converter anti-interference control system according to claim 6, wherein: the standby power supply unit (5) is specifically a storage battery pack, and the storage battery pack comprises a plurality of storage batteries connected in series.
8. The frequency converter anti-interference control system according to claim 7, wherein: the model of the charging module (4) is TH600X10ZZ, and the model of the voltage-stabilizing filtering module (6) is TH600X05 ZZ.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022060429.3U CN213213179U (en) | 2020-09-18 | 2020-09-18 | Anti-interference electric control system of frequency converter |
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| CN202022060429.3U CN213213179U (en) | 2020-09-18 | 2020-09-18 | Anti-interference electric control system of frequency converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112202236A (en) * | 2020-09-18 | 2021-01-08 | 山西潞安煤基合成油有限公司 | Anti-interference electricity control system of frequency converter and interference electricity detection method thereof |
| CN115276199A (en) * | 2022-09-27 | 2022-11-01 | 江苏智泰新能源科技有限公司 | Electric-dazzling prevention energy storage device of frequency converter |
| CN117792216A (en) * | 2024-01-06 | 2024-03-29 | 东营市沃格艾迪石油技术有限公司 | Star-triangle energy-saving control method for oil pumping unit |
-
2020
- 2020-09-18 CN CN202022060429.3U patent/CN213213179U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112202236A (en) * | 2020-09-18 | 2021-01-08 | 山西潞安煤基合成油有限公司 | Anti-interference electricity control system of frequency converter and interference electricity detection method thereof |
| CN115276199A (en) * | 2022-09-27 | 2022-11-01 | 江苏智泰新能源科技有限公司 | Electric-dazzling prevention energy storage device of frequency converter |
| CN115276199B (en) * | 2022-09-27 | 2023-01-10 | 江苏智泰新能源科技有限公司 | Electric-dazzling prevention energy storage device of frequency converter |
| CN117792216A (en) * | 2024-01-06 | 2024-03-29 | 东营市沃格艾迪石油技术有限公司 | Star-triangle energy-saving control method for oil pumping unit |
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