CN219875532U - Redundant structure of chemical production frequency converter - Google Patents
Redundant structure of chemical production frequency converter Download PDFInfo
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- CN219875532U CN219875532U CN202320157700.6U CN202320157700U CN219875532U CN 219875532 U CN219875532 U CN 219875532U CN 202320157700 U CN202320157700 U CN 202320157700U CN 219875532 U CN219875532 U CN 219875532U
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- 238000012824 chemical production Methods 0.000 title claims abstract description 13
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Abstract
The utility model provides a chemical production converter redundant structure, includes the inlet wire power, and the inlet wire power is connected with inlet wire circuit breaker QF1, and inlet wire circuit breaker QF1 lower extreme is connected and is gushed out magnetic switch cabinet L1, and the primary side of transformer T1 is connected to magnetic switch cabinet L1 that gushes out, and converter A and converter B are connected respectively to transformer T1's secondary side, and converter A and converter B's output connects in parallel and connects load D. The reliability of variable frequency dragging in chemical production is improved through the multistage redundancy of the transformer and the frequency converter.
Description
Technical Field
The utility model relates to the technical field of chemical industry high-voltage control, in particular to a redundant structure of a chemical industry production frequency converter.
Background
Most chemical devices have toxicity, inflammability, explosiveness, strong corrosion and extremely high correlation, reliable and stable operation of key type electrical equipment is more important, stable and reliable control is realized, some important high-voltage variable frequency dragging is realized, frequent tripping events in operation inevitably occur due to severe environment, and if two high-voltage variable frequency dragging loads are adopted to simultaneously drag one load, one is operated and the other is hot standby, so that the influence on production is greatly reduced.
In the prior art, a double-frequency-conversion dragging scheme is also available, for example, a main-standby double-frequency-conversion dragging system in petrochemical production is described in Chinese patent document CN 214591238U, two frequency converters are connected in parallel behind a wire inlet end and a power frequency breaker QF6 is connected in parallel, the scheme can only perform one-out-of-two work in the frequency converters, the utility of a rectifier bridge in the frequency converters cannot be exerted to the greatest extent, and when the front end fails, the redundancy effect of the frequency converters is lost.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a chemical production frequency converter redundancy structure and improving the dragging stability of a chemical frequency converter.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the utility model provides a chemical production converter redundant structure, includes the inlet wire power, and the inlet wire power is connected with inlet wire circuit breaker QF1, and inlet wire circuit breaker QF1 lower extreme is connected and is gushed out magnetic switch cabinet L1, and the primary side of transformer T1 is connected to magnetic switch cabinet L1 that gushes out, and converter A and converter B are connected respectively to transformer T1's secondary side, and converter A and converter B's output connects in parallel and connects load D.
The transformer T1 is provided with two groups of secondary sides, namely a primary side and a secondary side, two groups of contactors are arranged below the primary side and the secondary side, the primary side and the secondary side are connected with the two groups of contactors, the two groups of contactors are respectively connected with a rectifier bridge in the frequency converter A and the frequency converter B, and the frequency converter A and the frequency converter B are in communication connection with the DCS.
The two groups of contactor groups are respectively a control contactor group KM11-18 and a control contactor group KM21-28, the two groups of contactor groups are connected with eight groups of rectifier bridges in the frequency converter A and the frequency converter B, and the two groups of contactor groups are respectively controlled to be communicated by a PLC controller in the frequency converter A and the frequency converter B.
The appearance ends of the frequency converter A and the frequency converter B are respectively provided with an outgoing line breaker QF2 and an outgoing line breaker QF3.
According to the chemical production frequency converter redundancy structure, the reliability of variable frequency dragging in chemical production is improved through the multi-stage redundancy of the transformer and the frequency converter.
Drawings
The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of primary control of redundant dragging of a frequency converter according to the present utility model;
FIG. 2 shows primary wiring of a main loop and a A, B frequency converter in the transformer;
fig. 3 is a logic protection and control diagram for the interior of the frequency converter.
In the figure: the device comprises an incoming line breaker QF1, an inrush current switch cabinet L1, a transformer T1, a control contactor set KM11-18, a control contactor set KM21-28, a frequency converter A, a frequency converter B, a load D, an outgoing line breaker QF2 and an outgoing line breaker QF3.
Detailed Description
As shown in fig. 1-3, a redundant structure of a frequency converter in chemical production comprises an incoming line power supply, wherein the incoming line power supply is connected with an incoming line breaker QF1, the lower end of the incoming line breaker QF1 is connected with a surge magnetic switch cabinet L1, the surge magnetic switch cabinet L1 is connected with the primary side of a transformer T1, the secondary side of the transformer T1 is respectively connected with a frequency converter A and a frequency converter B, and the output ends of the frequency converter A and the frequency converter B are connected in parallel and are connected with a load D.
The transformer T1 is provided with two groups of secondary sides, namely a primary side and a secondary side, two groups of contactors are arranged below the primary side and the secondary side, the primary side and the secondary side are connected with the two groups of contactors, the two groups of contactors are respectively connected with a rectifier bridge in the frequency converter A and the frequency converter B, and the frequency converter A and the frequency converter B are in communication connection with the DCS.
The two groups of contactor groups are respectively a control contactor group KM11-18 and a control contactor group KM21-28, the two groups of contactor groups are connected with eight groups of rectifier bridges in the frequency converter A and the frequency converter B, and the two groups of contactor groups are respectively controlled to be communicated by a PLC controller in the frequency converter A and the frequency converter B.
The output of the transformer T1 is provided with two groups through the first secondary side and the second secondary side, even if one group of secondary sides fails, the other group of secondary side output can be connected with two groups of frequency converters through any group of contactor groups in the two groups, so that the multistage redundancy of the dragging source is realized, and the safety is improved.
As shown in the logic control diagram of the internal protection of the frequency converter in fig. 3, the design mainly aims at that two frequency converters are required to have a galloping function, parameters such as pulse amplitude and the like of a main control bridge controlled and managed by each CPU are mainly utilized, a communication management system is designed on the basis of the control of the original frequency converter to directly communicate with the standby frequency converter, and all data of the running frequency converter are copied to the standby frequency converter.
A/B converter PLC logic control diagram, original converter control function is unchanged, the utility model is mainly used for managing single converter operation I/O interface, the key is that when the converter is faulty, the reliable management of KM11-KM18 control is strictly implemented.
The control diagram of the total coordination cabinet of the A/B frequency converter has the functions of carrying out main control main regulation on two main and standby frequency converters, recording waves, monitoring, analyzing, judging and the like on all control information, and can be controlled by adopting PLC control and communication or CPU microprocessor, I/O interface and bus network interface.
Interlocking and control requirements:
QF1\QF2\QF3 is a high-voltage breaker switch and is controlled by the total coordination cabinet.
KM11-KM18, KM 21-KM 28 are low-voltage extractable contactors controlled by each single frequency converter, and safety maintenance outage measures are added. The premise of control is that each single frequency converter is self-checked after being added with a control power supply, the batch of contactors are closed, and then a high-voltage allowable closing signal is reported.
Program control description: (taking A# frequency converter as the main machine for example, B# as the hot standby)
A/B# frequency converter preparation
a.A/B frequency conversion:
and (5) integrating the control power supply of the frequency converter to finish the self-inspection of the internal control power supply.
After detecting the split state of the QF1 switch and the cut-off and put-in position of A (or B) on the main coordination cabinet, the two frequency converters PLC work and send out the combined KM1-KM8. And after the QF1 combining signal is detected, processing according to e bars after maintenance.
The frequency converter outputs without faults, and sends out a high-voltage allowable closing signal.
Two protection functions are added:after the frequency converter is disconnected from the power supply (when three power supplies are taken and all three signals are met), a jump control emergency stop signal is sent out, and the jump machine is not switched. />When 'electricity interference' occurs, a 'heavy fault' signal is sent, and the cutting machine operates.
b. Total coordination cabinet:
after the control power supply is combined, the master controller in the cabinet works, and the master coordination cabinet is provided with two left and right knobs of A (or B) 'cut-off and put-in', so as to control cut-off maintenance and put-in operation.
When QF1 is disconnected, a switch-off command is sent to the excitation surge tank, and when the main coordination tank receives a signal that the switch is in the off position, the tank sends a switch-on permission signal.
At this time, the "start" button QF1 is manually pressed to switch on, and the switch of the excitation surge tank is switched on for 1s in a delay time. Both frequency converters are powered on with high voltage. If normal, the two frequency converters send out standby output signals after delaying for 1 s.
And then QF2 is controlled to be switched on after the time delay is 1s, and QF3 is controlled to be switched on after the time delay is 1.5 s.
When the standby signal is present, the total coordination cabinet system automatically starts the A frequency conversion starting operation after the default setting delay time is 2s (or the external given frequency converter is given after the "starting" command signal is 2 s), locks the B frequency conversion starting signal, converts the B frequency conversion starting signal into a standby machine, and displays the B frequency conversion starting signal correspondingly.
If the A frequency converter does not have the standby condition, the total coordination cabinet system automatically starts the B frequency conversion starting operation after the time delay is set for 3s by default (or the outside gives a command signal for starting the frequency converter for 3 s), and the starting signal of the A frequency conversion is locked, converted into a standby machine and displayed correspondingly.
c. The A/B frequency converter operates normally and manually in operation: (taking the operation A as an example)
After the main coordination cabinet receives an external (such as DCS) switching command, the controller firstly analyzes and judges the state of the main and the standby. The method meets the requirements that a switching signal, a frequency converter running state inverting signal, a standby frequency converter standby signal and an outlet position combining signal can output the operation of a main frequency converter which is suddenly stopped, and after the standby signal of the main operation frequency converter is output, a start-up switching command is output to the standby frequency converter to start, and data such as a main machine pulse is copied to the standby frequency converter through a whole disk of a communication management system to start operation in an instant redundancy mode. The corresponding signal, current, frequency, etc. display also changes.
And (3) stopping the maintenance after the manual switching, namely after the switching is finished, putting a knob of a frequency converter to be maintained on the total coordination cabinet in a maintenance position after cutting/putting the frequency converter to be maintained on the total coordination cabinet. The frequency converter automatically cuts off the inlet KM1-8 and the outlet breaker.
d. In operation, the frequency converter fails to switch to operate: (taking the operation A as an example)
After the master coordination cabinet controller records the running signal, the master coordination cabinet controller receives a 'heavy fault' command of the running main frequency converter, and immediately sends out 8 alternating current contactor commands for tripping the outlet switch of the frequency converter and the rectifier bridge power supply of the frequency converter.
The method meets the requirements of a 'heavy fault' signal, a stop state of an outlet switch of the frequency converter, a 'standby' signal of the standby frequency converter and an outlet position-combining signal, and can output a 'starting' command to the standby frequency converter, and the data such as a pulse of a host computer is copied and operated to the standby frequency converter through a whole disk of a communication management system to immediately and redundantly start operation. The corresponding signal, current, frequency, etc. displays change accordingly, and the fault frequency converter is placed in the cut-off/put-in button on the total coordination cabinet.
And the fault frequency converter controls power supply maintenance, test and debugging.
e. Putting into standby after maintenance is completed:
and after the control power supply self-check is completed and the QF1 closing signal is detected, a PLC in the frequency converter sends a closing command for gradually closing KM1-KM8, and in the successive closing process, the frequency converter protection system is started to analyze and judge that the frequency converter protection system cannot generate secondary accidents again, so that the normal operation of the other frequency converter is influenced. In the gradual closing process of the frequency converter, a command of cutting KM1-KM8 is rapidly sent when a problem is detected, and overhaul is carried out until KM can be closed.
The frequency converter has no fault, and meets the requirements that QF1 and KM1-8 are switched on, and a high-voltage switched-on signal is sent. And putting the cut/put button at the put position on the main coordination cabinet, putting the cut/put button into an outlet switch of the overhaul frequency converter for processing according to b delays, and putting the cut/put button into a standby output as a standby state.
f. Shutdown
The main coordination cabinet only receives signals such as stop, emergency stop, skip control, comprehensive protection tripping of a motor, instrument interlocking, high-voltage loss and the like, uniformly carries out all tripping processing, sends tripping signals to all frequency converters, and all high-voltage switches QF1 and KM1-8 are disconnected.
4.4 The technical key points and control advantages of the double-machine redundancy control are that:
a. the optical fiber communication of the dual-redundancy frequency converter controls the operation and internal frequency conversion control program information.
b. The double-frequency conversion redundancy controls the starting and stopping of all switches through the coordination cabinet, and controls the switching and the input of the fault cabinet.
c. When the frequency converter has the problems of unit under-voltage, unit phase loss, communication faults, unit over-voltage, over-voltage stall, module faults, unit module overtemperature and the like, the switching can be realized. The motor current and the process are not disturbed, the switching time is less than or equal to 5ms, and the motor current and the process are truly undisturbed bidirectional switching. The power failure of a system such as overtemperature of a certain phase-shifting transformer is mainly considered in the construction of the transformer.
d. Through the optimal coordination control of a coordination control cabinet, two frequency converters share one set of phase-shifting transformer to be simultaneously high-voltage, one frequency converter runs, one frequency converter serves as a hot standby machine, two-way free switching is fast, and switching time is in ms level. One can be selected as a host machine and the other can be selected as a standby machine. After the fault frequency converter is repaired, the fault frequency converter can be used as a standby machine without stopping the motor.
Claims (4)
1. The utility model provides a chemical production converter redundant structure, its characterized in that, including the inlet wire power, the inlet wire power is connected with inlet wire circuit breaker QF1, and inlet wire circuit breaker QF1 lower extreme is connected and is gushed out magnetic switch cabinet L1, and the primary side of transformer T1 is connected to magnetic switch cabinet L1 that gushes out, and converter A and converter B are connected respectively to transformer T1's secondary side, and converter A and converter B's output connects in parallel and connects load D.
2. The redundant structure of a frequency converter for chemical production according to claim 1, wherein the transformer T1 is provided with two groups of secondary sides, namely a primary secondary side and a secondary side, two groups of contactors are arranged below the primary secondary side and the secondary side, the primary secondary side and the secondary side are connected with the two groups of contactors, the two groups of contactors are respectively connected with a rectifier bridge in the frequency converter a and the frequency converter B, and the frequency converter a and the frequency converter B are in communication connection with the DCS.
3. The redundant structure of a frequency converter for chemical production according to claim 2, wherein the two groups of contactor groups are respectively a control contactor group KM11-18 and a control contactor group KM21-28, the two groups of contactor groups are connected with eight groups of rectifier bridges in the frequency converter A and the frequency converter B, and the two groups of contactor groups are respectively controlled to be connected by a PLC controller in the frequency converter A and the frequency converter B.
4. The redundant structure of the frequency converter for chemical production according to claim 2, wherein the appearance ends of the frequency converter A and the frequency converter B are respectively provided with an outgoing line breaker QF2 and an outgoing line breaker QF3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320157700.6U CN219875532U (en) | 2023-02-08 | 2023-02-08 | Redundant structure of chemical production frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320157700.6U CN219875532U (en) | 2023-02-08 | 2023-02-08 | Redundant structure of chemical production frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219875532U true CN219875532U (en) | 2023-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320157700.6U Active CN219875532U (en) | 2023-02-08 | 2023-02-08 | Redundant structure of chemical production frequency converter |
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| Country | Link |
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| CN (1) | CN219875532U (en) |
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2023
- 2023-02-08 CN CN202320157700.6U patent/CN219875532U/en active Active
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