CN114614664A - Anti-interference electricity system of frequency converter of air separation unit and anti-interference electricity method thereof - Google Patents

Anti-interference electricity system of frequency converter of air separation unit and anti-interference electricity method thereof Download PDF

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Publication number
CN114614664A
CN114614664A CN202210312426.5A CN202210312426A CN114614664A CN 114614664 A CN114614664 A CN 114614664A CN 202210312426 A CN202210312426 A CN 202210312426A CN 114614664 A CN114614664 A CN 114614664A
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Prior art keywords
voltage
interference
control circuit
frequency converter
port
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Inventor
王兴本
赵颜颜
王龙翔
马玉东
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Lihuayi Lijin Refining and Chemical Co Ltd
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Lihuayi Lijin Refining and Chemical Co Ltd
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Priority to CN202210312426.5A priority Critical patent/CN114614664A/en
Publication of CN114614664A publication Critical patent/CN114614664A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Inverter Devices (AREA)

Abstract

The invention provides an anti-interference electricity system of a frequency converter of an air separation unit and an anti-interference electricity method thereof, wherein the anti-interference electricity system comprises the frequency converter, an external control circuit and an anti-interference electricity device, the external control circuit comprises a control switch led to a DCS system from outside, a control switch connected with an operating column and an anti-interference electricity device access port, and the anti-interference electricity device comprises a power supply control circuit and an anti-interference electricity control circuit; the anti-interference electricity device is connected to the external control circuit through the anti-interference electricity device access port, the output end of the power supply control circuit is connected with the input end of the anti-interference electricity control circuit, and the output end of the anti-interference electricity control circuit is connected with the starting control pin of the frequency converter through the contactor coil KA of the external control circuit. According to the scheme provided by the invention, the relay is controlled according to the input voltage of the system and the preset fixed value, and the work of the contactor is indirectly controlled, so that the starting and stopping of the frequency converter are controlled, the fixed value can be freely set, and the high-frequency-conversion-ratio frequency converter is strong in universality and extremely low in cost.

Description

Anti-interference electricity system of frequency converter of air separation unit and anti-interference electricity method thereof
Technical Field
The invention relates to the technical field of anti-interference electricity of electric equipment, in particular to an anti-interference electricity system of a frequency converter of an air separation unit and an anti-interference electricity method thereof.
Background
The air separation device is a set of industrial equipment for separating each component gas in air and respectively producing oxygen, nitrogen, argon and other gases of air components, and the frequency converter is an important part in the air separation device, and the production efficiency of the air separation device needs to be high-reliability continuous operation of the frequency converter.
In reality, the frequency converter is affected by a power grid voltage transient drop (voltage sag), a power grid voltage sag or voltage interruption caused by lightning stroke, short circuit or other reasons, and the power grid voltage returns to normal within 1.5 seconds. For the phenomenon, an anti-interference electricity device is mostly adopted, the anti-interference electricity device generally adopts a current/voltage detection module to collect power grid signals, a processor processes the collected electric signals, and finally a relay controls a contactor to pull in to spend the low valley period so as to prevent the frequency converter from being shut down and being in error work.
However, the current/voltage detection module in the anti-interference device is expensive, large in size, not highly versatile, and difficult to adapt to different types of frequency converters.
Disclosure of Invention
The invention provides an anti-interference electricity system of a frequency converter of an air separation device and an anti-interference electricity method thereof.A microprocessor controls a voltage output relay according to the input voltage of the system and a preset fixed value, and indirectly controls a contactor to work, thereby controlling the starting and stopping of the frequency converter.
In a first aspect, an embodiment of the invention provides an anti-interference system of an air separation unit frequency converter, which comprises a frequency converter (1), an external control circuit (2) and an anti-interference device (3), wherein the external control circuit (2) comprises a control switch (21) led to a DCS system, a control switch (22) connected with an operation column and an anti-interference device access port (23), and the anti-interference device (3) comprises a power supply control circuit (4) and an anti-interference control circuit (5);
anti-interference electricity device (3) pass through anti-interference electricity device access port (23) access outside control circuit (2), the 5V voltage output of power supply control circuit (4) with the 5V voltage input of anti-interference electricity control circuit (5) is connected, the output of anti-interference electricity control circuit (5) passes through the contactor coil KA of outside control circuit (2) with the start control pin of converter (1) is connected, power supply control circuit (4) are used for doing anti-interference electricity control circuit (5) provide 5V voltage, anti-interference electricity control circuit (5) are used for opening through contactor coil KA control converter (1) and stop.
In an alternative embodiment, the control switch (22) connected with the operation column comprises a starting switch SB1 and a stopping switch SB2, the starting switch SB1 is used for controlling the starting of the frequency converter, and the stopping switch SB2 is used for controlling the stopping of the frequency converter.
Further, the anti-interference electricity device access port (23) comprises four wiring ports, namely a bus port 101, a zero line port 102, a voltage control port 109 and a voltage output port 109'.
Further, the power supply control circuit (4) comprises a relay assembly (41), a transformer (42), a lithium battery assembly (43), and a voltage output relay auxiliary contact KA 0';
the relay assembly (41) comprises two voltage detection relays KB1 and KB2, two ends of the voltage detection relay KB1 are respectively connected with the bus port 101 and the neutral port 102, and two ends of the voltage detection relay KB2 are respectively connected with the bus port 109 and the neutral port 102;
the input end of the transformer (42) is connected with 220 alternating-current voltage through the bus port 101 and used for converting the 220 alternating-current voltage into 5V direct-current voltage;
the lithium battery assembly (43) consists of a rechargeable lithium battery and an overcurrent and short circuit prevention protection board and is used for providing uninterrupted 5V voltage for the anti-interference control circuit (5) together with the transformer (42);
the voltage output relay auxiliary contact KA0 'is used for outputting 220 alternating-current voltage from the bus port 101 to the voltage output port 109'.
Furthermore, the anti-interference electric control circuit (5) comprises a microprocessor (51), a microprocessor power switch SB0, an alarm reset switch (53), a signal amplification output module (54), an LED display module (55) and a voltage detection relay auxiliary contact (56);
the microprocessor power switch SB0 is used for controlling the microprocessor (51) to be electrified;
the voltage detection relay auxiliary contact (56) comprises two voltage detection relay auxiliary contacts KB1 'and KB 2', the voltage detection relay auxiliary contact KB1 'is connected with the voltage detection relay KB1 and is used for receiving a voltage signal according to the state of the voltage detection relay KB1 and inputting the voltage signal into an input interface PINB _0 of the microprocessor (51) through a current-limiting resistor, and the voltage detection relay auxiliary contact KB 2' is connected with the voltage detection relay KB2 and is used for receiving a voltage signal according to the state of the voltage detection relay KB2 and inputting the voltage signal into an input interface PINB _1 of the microprocessor (51) through a current-limiting resistor;
the microprocessor (51) is used for outputting a low-voltage signal from the output port PORTA _0 according to the input voltage signal of the input interface PINB _0 and the input voltage signal of the input interface PINB _ 1;
the signal amplification output module (54) comprises a triode Q1 and a voltage output relay KA0, and is used for amplifying a low-voltage signal output by the output port PORTA _0 into a 5V voltage signal, and controlling the voltage output relay KA0 to be closed by using the 5V voltage signal so as to enable the auxiliary contact KA 0' of the voltage output relay to be conducted;
the LED display module (55) comprises a system lamp LED _ SYS, an output lamp LED _ OUT, a power-off identification lamp LED _ TIP and a power-off alarm lamp LED _ WOR;
and the alarm reset switch (53) is used for controlling the power-on-state alarm lamp LED _ WOR to reset.
Further, the microprocessor (51) is an AVR-atmega32u type microprocessor, and the rechargeable lithium battery is a 3.7V-1300Mah lithium battery.
Furthermore, the external control circuit (2) further comprises a fault indication module for sending out an indication signal when the frequency converter (1) has a fault.
In a second aspect, an embodiment of the present invention provides an anti-interference method for an inverter of an air separation plant, including the following steps:
the method comprises the following steps: the microprocessor (51) is started by pressing the microprocessor power switch SB0, the system lamp LED _ SYS flickers, and the anti-interference system enters a normal working state; the time fixed value comprises start anti-shake time, stop anti-shake time and electricity-shaking overtime stop time;
step two: the starting switch SB1 is pressed down and the duration time is longer than the starting anti-shake time, the external control circuit (2) inputs the power supply voltage into the power supply control circuit (4) through the voltage control port 109 and the bus port 101, the power supply control circuit (4) converts the 220V alternating current voltage input by the bus port 101 into 5V direct current voltage and transmits the voltage to the anti-shake control circuit (5), the anti-shake control circuit (5) controls the voltage output relay KA0 to be closed according to the power obtained by the voltage control port 109, the contactor coil KA is powered and closed, and the frequency converter (1) is started;
step three: when the anti-interference control circuit (5) detects that the voltage control port 109 and the bus port 101 are powered off, interference power is determined to occur, the anti-interference control circuit (5) controls the voltage output relay KA0 to be kept closed, the contactor coil KA is powered off and disconnected, the frequency converter (1) is stopped, the interference power identification lamp LED _ TIP is turned on for 1000ms, and the interference power alarm lamp LED _ WOR is kept on normally;
step four: when the anti-interference electric control circuit (5) judges that the interference electric duration is longer than the interference electric overtime shutdown time, the power supply interruption is determined, and the anti-interference electric control circuit (5) controls the voltage output relay KA0 to be disconnected;
step five: when the anti-interference electric control circuit (5) judges that the electric interference duration is less than the electric interference overtime shutdown time, the electric interference is determined to stop, the contactor coil KA is electrified and closed, the frequency converter (1) is restarted to complete one-time electric interference protection, and the step III is carried out;
step six: when the frequency converter is controlled to be normally stopped, the starting switch SB2 is pressed down and the duration is longer than the stop anti-shake time, the external control circuit (2) stops inputting the power supply voltage into the power supply control circuit (4) through the voltage control port 109, the anti-shake control circuit (5) controls the voltage output relay KA0 to be disconnected according to the power loss of the voltage control port 109, the contactor coil KA is disconnected in a power loss mode, and the frequency converter (1) is stopped.
In an alternative embodiment, when the voltage output relay KA0 is closed, the output lamp LED _ OUT is lit; when voltage output relay KA0 is off, output lamp LED _ OUT is off.
Further, when the power-off is determined to stop in the third step, a warning reset switch (53) is pressed to control the power-off warning lamp LED _ WOR to reset.
Compared with the prior art, the invention has the beneficial effects that: the anti-interference system is characterized in that two input voltages of the system are taken, auxiliary contact pairs 5V, GND of two relays are used for selectively outputting according to the two input voltages of the system, and then the two input voltages are input into the microprocessor through the current-limiting resistor, the voltage conditions of the two input voltages can be determined by the microprocessor, the microprocessor controls the voltage output relay to output the system voltage to the coil top of the contactor according to the voltage conditions of the two input voltages and a preset fixed value, and controls the starting and stopping of the frequency converter.
It should be understood that what is described in the summary above is not intended to limit key or critical features of embodiments of the invention, nor is it intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an external control circuit provided in an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a power supply control circuit according to an embodiment of the disclosure;
fig. 3 is a schematic structural diagram of an anti-interference control circuit provided in an embodiment of the present disclosure;
FIG. 4 is a schematic diagram illustrating a logic determination of a microprocessor according to an embodiment of the present disclosure.
Detailed Description
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and the embodiments of the present invention are illustrative only and are not intended to limit the scope of the present invention.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
As shown in fig. 1-4, the embodiment of the present disclosure provides an anti-interference electricity system for an air separation plant frequency converter, which includes a frequency converter 1, and further includes an external control circuit 2 and an anti-interference electricity device 3, where the external control circuit 2 includes a control switch 21 leading out to the DCS system, a control switch 22 connected to an operation column, and an anti-interference electricity device access port 23, and the anti-interference electricity device 3 includes a power supply control circuit 4 and an anti-interference electricity control circuit 5;
the anti-interference electricity device 3 passes through the access port 23 of anti-interference electricity device inserts external control circuit 2, the output of power supply control circuit 4 with anti-interference electricity control circuit 5's input is connected, anti-interference electricity control circuit 5's output passes through external control circuit 2's contactor coil KA with the start control pin of converter 1 is connected, power supply control circuit 4 is used for doing anti-interference electricity control circuit 5 provides 5V voltage, anti-interference electricity control circuit 5 is used for opening through contactor coil KA control converter 1 and stops.
In an alternative embodiment, the control switch 22 connected with the operation column comprises a starting switch SB1 and a stopping switch SB2, wherein the starting switch SB1 is used for controlling the starting of the frequency converter, and the stopping switch SB2 is used for controlling the stopping of the frequency converter.
The anti-interference electricity device access port 23 comprises four wiring ports, namely a bus port 101, a zero line port 102, a voltage control port 109 and a voltage output port 109'.
The power supply control circuit 4 comprises a relay assembly 41, a transformer 42, a lithium battery assembly 43 and a voltage output relay auxiliary contact KA 0';
the relay assembly 41 comprises two voltage detection relays KB1 and KB2, two ends of the voltage detection relay KB1 are respectively connected with the bus bar port 101 and the neutral line port 102, and two ends of the voltage detection relay KB2 are respectively connected with the bus bar port 109 and the neutral line port 102;
the input end of the transformer 42 is connected with 220 alternating-current voltage through the bus port 101, and is used for converting the 220 alternating-current voltage into 5V direct-current voltage;
the lithium battery assembly 43 is composed of a rechargeable lithium battery and an overcurrent and short circuit prevention protection board, and is used for providing uninterrupted 5V voltage for the anti-interference control circuit 5 together with the transformer 42;
the voltage output relay auxiliary contact KA0 'is used for outputting 220 alternating-current voltage from the bus port 101 to the voltage output port 109'.
The anti-interference electric control circuit 5 comprises a microprocessor 51, a microprocessor power switch SB0, an alarm reset switch 53, a signal amplification output module 54, an LED display module 55 and a voltage detection relay auxiliary contact 56;
the microprocessor power switch SB0 is used for controlling the microprocessor 51 to be powered on;
the voltage detection relay auxiliary contact 56 comprises two voltage detection relay auxiliary contacts KB1 'and KB 2', the voltage detection relay auxiliary contact KB1 'is connected with the voltage detection relay KB1, and is used for accessing a voltage signal according to the state of the voltage detection relay KB1 and inputting the voltage signal to the input interface PINB _0 of the microprocessor 51 through a current limiting resistor, and the voltage detection relay auxiliary contact KB 2' is connected with the voltage detection relay KB2, and is used for accessing a voltage signal according to the state of the voltage detection relay KB2 and inputting the voltage signal to the input interface PINB _1 of the microprocessor 51 through a current limiting resistor;
the microprocessor 51 is configured to output a low voltage signal from the output port PORTA _0 according to the input voltage signal of the input interface PINB _0 and the input voltage signal of the input interface PINB _ 1;
the signal amplification output module 54 includes a triode Q1 and a voltage output relay KA0, and is configured to amplify the low voltage signal output by the output port PORTA _0 to a 5V voltage signal, and control the voltage output relay KA0 to be closed by using the 5V voltage signal, so that the voltage output relay auxiliary contact KA 0' is turned on;
the LED display module 55 comprises a system lamp LED _ SYS, an output lamp LED _ OUT, a power-off identification lamp LED _ TIP and a power-off alarm lamp LED _ WOR;
and the alarm reset switch 53 is used for controlling the power-dazzling alarm lamp LED _ WOR to reset.
The microprocessor 51 is an AVR-atmega32u type microprocessor and the rechargeable lithium battery is a 3.7V-1300Mah lithium battery.
The external control circuit 2 further comprises a fault indication module for sending out an indication signal when the frequency converter 1 is in fault.
The embodiment of the disclosure provides an anti-interference electricity method for a frequency converter of an air separation device, which comprises the following steps:
the method comprises the following steps: the microprocessor 51 is started by pressing the microprocessor power switch SB0, the system lamp LED _ SYS flickers, and the anti-interference system enters a normal working state; the time fixed value comprises start anti-shake time, stop anti-shake time and electricity-shaking overtime stop time;
in addition, the time setting value also comprises start-stop anti-shaking intervals, prompting lamp time, electricity shaking recovery delay time and shutdown waiting time, and the effect of the total time setting value is shown in table 1.
Watch 1
Figure BDA0003567594350000071
Figure BDA0003567594350000081
Step two: the starting switch SB1 is pressed and the duration time is longer than the starting anti-shake time, the external control circuit 2 inputs the power supply voltage into the power supply control circuit 4 through the voltage control port 109 and the bus port 101, the power supply control circuit 4 converts the 220V alternating current voltage input by the bus port 101 into 5V direct current voltage and transmits the voltage to the anti-shake control circuit 5, the anti-shake control circuit 5 controls the voltage output relay KA0 to be closed according to the power obtained by the voltage control port 109, the contactor coil KA is powered to be closed, and the frequency converter 1 is started;
step three: when the anti-interference control circuit 5 detects that the voltage control port 109 and the bus port 101 lose power, the occurrence of interference power is determined, the anti-interference control circuit 5 controls the voltage output relay KA0 to be kept closed, the contactor coil KA loses power and is disconnected, the frequency converter 1 is stopped, the interference power identification lamp LED _ TIP is turned on for 1000ms, and the interference power alarm lamp LED _ WOR is kept normally on;
step four: when the anti-interference electric control circuit 5 judges that the interference electric duration is longer than the interference electric overtime shutdown time, the power supply interruption is determined, and the anti-interference electric control circuit 5 controls the voltage output relay KA0 to be disconnected;
step five: when the anti-interference electric control circuit 5 judges that the electric interference duration is less than the electric interference overtime shutdown time, the electric interference is determined to stop, the contactor coil KA is electrified and closed, the frequency converter 1 is restarted to finish the primary electric interference protection, and the step III is carried out;
step six: when the frequency converter is controlled to normally stop, the starting switch SB2 is pressed down and the duration time is longer than the stop anti-shake time, the external control circuit 2 stops inputting the power supply voltage into the power supply control circuit 4 through the voltage control port 109, the anti-shake control circuit 5 controls the voltage output relay KA0 to be disconnected according to the power loss of the voltage control port 109, the contactor coil KA is disconnected in a power loss mode, and the frequency converter 1 stops.
And in the third step, when the power-dazzling is determined to stop, the alarm reset switch 53 is pressed to control the power-dazzling alarm lamp LED _ WOR to reset.
When the voltage output relay KA0 is closed, the output lamp LED _ OUT is lightened; when voltage output relay KA0 is off, output lamp LED _ OUT is off.
The anti-interference electricity system and the anti-interference electricity method for the frequency converter of the air separation plant according to the present invention are further illustrated by the following examples.
The power supply control circuit 4 comprises a relay assembly 41, a transformer 42, a lithium battery assembly 43, a voltage output relay auxiliary contact KA 0', and the anti-interference control circuit 5 comprises a microprocessor 51, a microprocessor power switch SB0, an alarm reset switch 53, a signal amplification output module 54, an LED display module 55 and a voltage detection relay auxiliary contact 56
The using method comprises the following steps:
firstly, an ISP programmer is used for writing a time constant value into the microprocessor 51, and the time constant value cannot be modified after the operation;
pressing a power switch SB0 of the microprocessor in the figure 3 to electrify and start the microprocessor 51, and when a system lamp LED _ SYS flickers, the anti-interference system enters a normal working state;
pressing a starting switch SB1 in the figure 1, enabling a voltage control port 109 to be electrified, enabling a voltage detection relay KB2 to be closed, meeting the logic condition of a logic 2 starting command, enabling an output voltage signal of a microprocessor 51 to control a voltage output relay KA0 to be electrified and closed, enabling an auxiliary contact KA0 'of the voltage output relay to be conducted, enabling the voltage of a bus port 101 to be transmitted to the voltage output port 109', enabling a contactor coil KA to be electrified, starting a frequency converter 1, and enabling an output lamp LED _ OUT to be lightened;
when the frequency converter 1 is in a starting state, namely all the L1, the voltage control port 109 and the bus port 101 are powered off, the voltage detection relays KB1 and KB2 are disconnected, the logic 3 identification power-off logic condition is met, the voltage detection relays are judged to be powered off, the microprocessor 51 controls the voltage output relay KA0 to be kept closed, the voltage output relay auxiliary contact KA0 'is kept conducted, but the voltage output port 109' is powered off due to the power-off of the bus port 101, the contactor coil KA is powered off, the frequency converter 1 is stopped, the power-off identification lamp LED _ TIP is lighted for 1000ms, and the power-off alarm lamp LED _ WOR is kept normally lighted;
when the microprocessor 51 judges that the electricity dazzling duration is longer than the electricity dazzling overtime shutdown time and meets logic conditions of electricity dazzling overtime shutdown of logic 4, the microprocessor 51 controls the voltage output relay KA0 to be disconnected, so that the auxiliary contact KA 0' of the voltage output relay is turned off, and the output lamp LED _ OUT is turned off;
when the microprocessor 51 judges that the power-dazzling duration is less than the power-dazzling overtime shutdown time, the power-dazzling is finished, the bus port 101 is powered up again, because the power-dazzling duration of the voltage output relay KA0 is kept closed all the time, the auxiliary contact KA0 'of the voltage output relay is kept conducted all the time, the voltage of the bus port 101 is immediately transmitted to the voltage output port 109', the contactor coil KA is powered up and closed all the time, the frequency converter 1 is restarted to complete one power-dazzling protection, the voltage control port 109 is powered up all the time, the alarm reset switch 53 is pressed to control the power-dazzling alarm lamp LED _ WOR to reset, and the frequency converter is restarted once in the whole process;
pressing the starting switch SB2, enabling the duration time to be longer than the shutdown anti-shake time, enabling the voltage control port 109 to lose power, enabling the bus port 101 to be kept powered on, meeting the logic condition of a logic 1 shutdown command, enabling the microprocessor 51 to control the voltage output relay KA0 to be disconnected, enabling the voltage output relay auxiliary contact KA 0' to be turned off, enabling the contactor coil KA to lose power and be disconnected, and enabling the frequency converter 1 to be shut down to complete a normal shutdown action.
It should be noted that, regarding the specific structure of the present invention, the connection relationship between the modules adopted in the present invention is determined and can be realized, except for the specific description in the embodiment, the specific connection relationship can bring the corresponding technical effect, and the technical problem proposed by the present invention is solved on the premise of not depending on the execution of the corresponding software program.
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; while the invention has been described in detail and with reference to the foregoing embodiments, it will 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; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides an anti-interference electricity system of air separation plant converter, includes converter (1), its characterized in that: the anti-interference device is characterized by further comprising an external control circuit (2) and an anti-interference device (3), wherein the external control circuit (2) comprises a control switch (21) led to a DCS system from outside, a control switch (22) connected with an operation column and an anti-interference device access port (23), and the anti-interference device (3) comprises a power supply control circuit (4) and an anti-interference control circuit (5);
anti-interference electricity device (3) pass through anti-interference electricity device access port (23) access outside control circuit (2), the 5V voltage output of power supply control circuit (4) with the 5V voltage input of anti-interference electricity control circuit (5) is connected, the output of anti-interference electricity control circuit (5) passes through the contactor coil KA of outside control circuit (2) with the start control pin of converter (1) is connected, power supply control circuit (4) are used for doing anti-interference electricity control circuit (5) provide 5V voltage, anti-interference electricity control circuit (5) are used for opening through contactor coil KA control converter (1) and stop.
2. The anti-interference electric system of the air separation plant frequency converter of claim 1, characterized in that: the control switch (22) connected with the operation column comprises a starting switch SB1 and a stop switch SB2, wherein the starting switch SB1 is used for controlling the starting of the frequency converter, and the stop switch SB2 is used for controlling the stopping of the frequency converter.
3. The anti-interference electric system of the air separation plant frequency converter of claim 2, characterized in that: the anti-interference electricity device access port (23) comprises four wiring ports, namely a bus port 101, a zero line port 102, a voltage control port 109 and a voltage output port 109'.
4. The anti-interference electric system of the air separation plant frequency converter of claim 3, characterized in that: the power supply control circuit (4) comprises a relay assembly (41), a transformer (42), a lithium battery assembly (43) and a voltage output relay auxiliary contact KA 0';
the relay assembly (41) comprises two voltage detection relays KB1 and KB2, two ends of the voltage detection relay KB1 are respectively connected with the bus port 101 and the neutral port 102, and two ends of the voltage detection relay KB2 are respectively connected with the bus port 109 and the neutral port 102;
the input end of the transformer (42) is connected with 220 alternating-current voltage through the bus port 101 and used for converting the 220 alternating-current voltage into 5V direct-current voltage;
the lithium battery assembly (43) consists of a rechargeable lithium battery and an overcurrent and short circuit prevention protection board and is used for providing uninterrupted 5V voltage for the anti-interference control circuit (5) together with the transformer (42);
the voltage output relay auxiliary contact KA0 'is used for outputting 220 alternating-current voltage from the bus port 101 to the voltage output port 109'.
5. The anti-interference electric system of the air separation plant frequency converter of claim 4, characterized in that: the anti-interference electric control circuit (5) comprises a microprocessor (51), a microprocessor power switch SB0, an alarm reset switch (53), a signal amplification output module (54), an LED display module (55) and a voltage detection relay auxiliary contact (56);
the microprocessor power switch SB0 is used for controlling the microprocessor (51) to be electrified;
the voltage detection relay auxiliary contact (56) comprises two voltage detection relay auxiliary contacts KB1 'and KB 2', the voltage detection relay auxiliary contact KB1 'is connected with the voltage detection relay KB1 and is used for accessing a voltage signal according to the state of the voltage detection relay KB1 and inputting the voltage signal into an input interface PINB _0 of the microprocessor (51) through a current limiting resistor, and the voltage detection relay auxiliary contact KB 2' is connected with the voltage detection relay KB2 and is used for accessing the voltage signal according to the state of the voltage detection relay KB2 and inputting the voltage signal into an input interface PINB _1 of the microprocessor (51) through the current limiting resistor;
the microprocessor (51) is used for outputting a low-voltage signal from the output port PORTA _0 according to the input voltage signal of the input interface PINB _0 and the input voltage signal of the input interface PINB _ 1;
the signal amplification output module (54) comprises a triode Q1 and a voltage output relay KA0, and is used for amplifying a low-voltage signal output by the output port PORTA _0 into a 5V voltage signal, and controlling the voltage output relay KA0 to be closed by using the 5V voltage signal so as to enable the auxiliary contact KA 0' of the voltage output relay to be conducted;
the LED display module (55) comprises a system lamp LED _ SYS, an output lamp LED _ OUT, a power-off identification lamp LED _ TIP and a power-off alarm lamp LED _ WOR;
and the alarm reset switch (53) is used for controlling the power-on-state alarm lamp LED _ WOR to reset.
6. The anti-interference electric system of the air separation plant frequency converter of claim 5, characterized in that: the microprocessor (51) is an AVR-atmega32u type microprocessor, and the rechargeable lithium battery is a 3.7V-1300Mah lithium battery.
7. The anti-interference electric system of the air separation plant frequency converter according to any one of claims 1 to 6, characterized in that: the external control circuit (2) further comprises a fault indication module for sending out an indication signal when the frequency converter (1) has a fault.
8. An anti-interference electricity method for a frequency converter of an air separation device is characterized in that: the method comprises the following steps:
the method comprises the following steps: the microprocessor (51) is started by pressing the microprocessor power switch SB0, the system lamp LED _ SYS flickers, and the anti-interference system enters a normal working state; the time fixed value comprises start anti-shake time, stop anti-shake time and electricity-shaking overtime stop time;
step two: the starting switch SB1 is pressed down and the duration time is longer than the starting anti-shake time, the external control circuit (2) inputs the power supply voltage into the power supply control circuit (4) through the voltage control port 109 and the bus port 101, the power supply control circuit (4) converts the 220V alternating current voltage input by the bus port 101 into 5V direct current voltage and transmits the voltage to the anti-shake control circuit (5), the anti-shake control circuit (5) controls the voltage output relay KA0 to be closed according to the power obtained by the voltage control port 109, the contactor coil KA is powered and closed, and the frequency converter (1) is started;
step three: when the anti-interference electric control circuit (5) detects that the voltage control port 109 and the bus port 101 lose electricity, the occurrence of interference electricity is determined, the anti-interference electric control circuit (5) controls the voltage output relay KA0 to be kept closed, the contactor coil KA loses electricity and is disconnected, the frequency converter (1) is stopped, the interference electricity identification lamp LED _ TIP is lighted for 1000ms, and the interference electricity alarm lamp LED _ WOR is kept normally lighted;
step four: when the anti-interference electric control circuit (5) judges that the interference electric duration is longer than the interference electric overtime shutdown time, the power supply interruption is determined, and the anti-interference electric control circuit (5) controls the voltage output relay KA0 to be disconnected;
step five: when the anti-interference electric control circuit (5) judges that the electric interference duration is less than the electric interference overtime shutdown time, the electric interference is determined to stop, the contactor coil KA is electrified and closed, the frequency converter (1) is restarted to complete one-time electric interference protection, and the step III is carried out;
step six: when the frequency converter is controlled to normally stop, the starting switch SB2 is pressed down and the duration time is longer than the stop anti-shake time, the external control circuit (2) stops inputting the power supply voltage into the power supply control circuit (4) through the voltage control port 109, the anti-shake control circuit (5) controls the voltage output relay KA0 to be disconnected according to the power loss of the voltage control port 109, the contactor coil KA is disconnected in a power loss mode, and the frequency converter (1) stops.
9. The anti-interference electricity method for the frequency converter of the air separation plant according to claim 8, characterized in that: when the voltage output relay KA0 is closed, the output lamp LED _ OUT is lightened; when voltage output relay KA0 is off, output lamp LED _ OUT is off.
10. The anti-interference electricity method for the frequency converter of the air separation plant according to claim 9, characterized in that: and in the third step, when the power-shaking is determined to stop, pressing an alarm reset switch (53) to control the power-shaking alarm lamp LED _ WOR to reset.
CN202210312426.5A 2022-03-28 2022-03-28 Anti-interference electricity system of frequency converter of air separation unit and anti-interference electricity method thereof Pending CN114614664A (en)

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CN202210312426.5A CN114614664A (en) 2022-03-28 2022-03-28 Anti-interference electricity system of frequency converter of air separation unit and anti-interference electricity method thereof

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Application Number Priority Date Filing Date Title
CN202210312426.5A CN114614664A (en) 2022-03-28 2022-03-28 Anti-interference electricity system of frequency converter of air separation unit and anti-interference electricity method thereof

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CN114614664A true CN114614664A (en) 2022-06-10

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