CN111865176B - Method for coping with power supply flash - Google Patents
Method for coping with power supply flash Download PDFInfo
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- CN111865176B CN111865176B CN202010670443.7A CN202010670443A CN111865176B CN 111865176 B CN111865176 B CN 111865176B CN 202010670443 A CN202010670443 A CN 202010670443A CN 111865176 B CN111865176 B CN 111865176B
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- power supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- Inverter Devices (AREA)
Abstract
The invention discloses a method for dealing with power supply flash, which comprises the following steps: canceling a voltage loss tripping function of a load switch in a power distribution room; the main loop and the control loop adopt a locking loop; the PLC starts a power-down maintaining function and memorizes the running state of a circuit before power-down; setting the frequency converter to a fault automatic reset and tracking operation frequency starting mode; after the mains supply is cut off, the automatic reclosing switch restores the power supply to the main loop and the control loop through the power distribution room; the PLC controller recovers related functional data, and the circuit continues to work according to the running state before power failure; the frequency converter tracks the running frequency of the motor after power failure, then starts with the tracked running frequency, and accelerates to recover to the running frequency before power failure, thereby avoiding the condition that power supply is recovered manually and the frequency converter is started from 0HZ, ensuring the normal running of the frequency converter, and further avoiding great economic loss.
Description
Technical Field
The invention relates to the technical field of automatic control in the building ceramic industry, in particular to a method for dealing with power supply flash.
Background
The power supply is flashed: in the time not exceeding 2 seconds, the power supply of the commercial power is interrupted or the voltage is low; in a power supply accident, the power-off time is measured in milliseconds and is far shorter than 2 seconds when the commercial power can be automatically and successfully reclosed. The power supply accident that the automatic reclosing of commercial power is unsuccessful never occurs, so, under normal condition, the commercial power can be reclosed fast when the power supply is broken, and the factory is automatically supplied with power.
According to the progress of the control technology and the core equipment of a kiln, a gas producer and a spray drying tower in the ceramic building industry, the fans have the characteristic of large inertia operation, and the motors of the kiln, the gas producer and the spray drying tower have the characteristic of large inertia operation, namely, a free stop mode is adopted during stable operation, and the motors can be stopped for a long time (generally more than 2 minutes). After the power supply is flashed off, the operating frequency of the motor can be reduced, and through repeated tests, for example: when the motor runs at 35HZ, the running frequency is reduced by about 3HZ after the power is cut off for two seconds. If the power is supplied again, if the frequency converter is started from 0HZ and the motor still runs at about 32HZ, a regenerative voltage fault can be generated, which affects production and even causes great economic loss and potential safety risk. In addition, a load switch of a power distribution room of a ceramic building factory has a voltage-loss tripping function, after a mains supply is flashed off, the load switch of the power distribution room, a contactor and an intermediate relay in a circuit can be tripped, and after a call comes, the circuit needs to be manually switched on to recover power supply, so that time delay is caused, and production is influenced; therefore, it is desirable to provide a method for dealing with power source flash, which automatically restores power supply and operation to the frequency converter, and sets the frequency converter to start up with the tracking operation frequency, so as to avoid the situation that power supply is restored manually and the frequency converter is started up from 0HZ, so that the frequency converter normally operates, and stable production is ensured.
Disclosure of Invention
The invention aims to provide a method for coping with power supply flash, which can automatically recover power supply and operation of a frequency converter when the power supply flash within two seconds is not more than two seconds, the frequency converter is set to start with tracking operation frequency, and a knob switch is adopted to replace a button switch in a circuit, so that the circuit forms a locking loop, the conditions of manual power recovery and the start of the frequency converter from 0HZ are avoided, the frequency converter normally operates, stable production is ensured, and thus, great economic loss and potential safety risk are avoided.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a method for dealing with power supply flash-off comprises a main loop, a control loop, a power distribution room and a mains supply; the main loop and the control loop are respectively connected with a power distribution room; the power distribution room is connected with a mains supply and is used for supplying power to the main loop and the control loop; the main loop comprises a frequency converter and a motor; the control loop comprises a PLC controller; the method comprises the following steps:
step S1, canceling the voltage loss tripping function of a load switch in the power distribution room;
step S2, the main loop and the control loop adopt a locking loop;
step S3, the PLC starts a power-down maintaining function and memorizes the running state of the circuit before power-down;
step S4, setting the frequency converter to a fault automatic reset and tracking operation frequency starting mode;
step S5, after the mains supply is cut off, the automatic reclosing switch restores the power supply to the main loop and the control loop through the power distribution room;
step S6, the PLC controller restores the relevant function data, and the circuit continues to run according to the running state before power failure;
and step S7, the frequency converter tracks the running frequency of the motor after power failure, then starts from the tracked running frequency, and accelerates the recovery to the running of the working frequency before power failure.
Preferably, the main circuit further comprises a plurality of circuit breakers and a plurality of contactors; the input ends of the circuit breakers are connected with the power distribution room, and the output ends of the circuit breakers are connected with the frequency converter; the input ends of the contactors are connected with the frequency converter; the output ends of the contactors are connected with the motor; the circuit breakers comprise a first circuit breaker, a second circuit breaker and a third circuit breaker; the contactor includes a first contactor, a second contactor, and a third contactor.
Preferably, when power supply is recovered in the circuit, the PLC controller controls the first circuit breaker, the second circuit breaker, the third circuit breaker, the first contactor, the second contactor and the third contactor to be attracted.
Preferably, the common end of the PLC controller is connected with the negative end of the control power supply; the control circuit further comprises a first knob switch, a fourth contactor, a second knob switch and a first intermediate relay, wherein the first knob switch is connected with the fourth contactor in series; the first knob switch is connected with the output end of the PLC; the fourth contactor is connected with the positive end of the control power supply; the second knob switch is connected with the output end of the PLC; the second knob switch is connected with the first intermediate relay; the first intermediate relay is connected with the positive end of the control power supply; when power supply is recovered in the circuit, the PLC controller controls the fourth contactor and the first intermediate relay to be attracted.
Preferably, a fuse is connected in series between the common terminal of the PLC controller and the negative terminal of the control power supply.
Preferably, the controller, the first knob switch, the fourth contactor, the control power supply and the fuse constitute a first locking loop.
Preferably, the controller, the second knob switch, the first intermediate relay, the control power supply and the fuse form a second latching loop.
Preferably, a second intermediate relay is connected in series between the analog common terminal and the operation terminal of the frequency converter; and after power supply is recovered in the circuit, the PLC controls the second intermediate relay to be sucked, and the analog common terminal of the frequency converter is connected with the operation terminal.
Advantageous effects
Compared with the prior art, the invention has the beneficial technical effects that: the invention provides a method for coping with power supply flash-off, which is characterized in that a voltage-loss tripping function of a load switch of a power distribution room is cancelled, a knob switch is used for replacing a button switch in the existing circuit, the load switch cannot be tripped after mains supply is flashed, so that mains supply automatically recloses and then automatically restores power supply to a main circuit and a control circuit without manual switching-on, time delay is avoided, a PLC (programmable logic controller) memorizes the operating state of the circuit before power failure due to the fact that a power failure maintaining function is started, the knob switch works according to the set state before power failure after power failure is restored, manual switching-on is not needed, the PLC restores related functional data, the circuit can continuously work according to the operating state before power failure, a frequency converter tracks the operating frequency of a motor after power failure through a tracking operating frequency starting function, then starts from the tracked operating frequency and accelerates to restore to the normal operating frequency, thereby drag the motor normal operating, avoid by artifical combined floodgate resume power supply and the condition that the converter starts from 0HZ, guaranteed the normal operating of converter, stable production to major economic loss and potential safety risk have been avoided.
Drawings
FIG. 1 is a flow chart of the operation of the present invention;
fig. 2 is a circuit diagram of the main loop of the present invention.
FIG. 3 is a circuit diagram of a control loop of the present invention;
fig. 4 is a schematic diagram of the short circuit of the operation end and the analog common end of the frequency converter of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, a method for dealing with power source flash-off includes a main circuit, a control circuit, a power distribution room and a utility power, wherein the main circuit and the control circuit are respectively connected with the power distribution room, and the power distribution room is connected with the utility power;
the main circuit comprises a plurality of circuit breakers, a frequency converter, a plurality of contactors and a motor; the input ends of the circuit breakers are connected with the power distribution room, and the output ends of the circuit breakers are connected with the frequency converter; the input ends of the contactors are connected with the frequency converter; the output ends of the contactors are connected with the motor; the circuit breakers comprise a first circuit breaker, a second circuit breaker and a third circuit breaker; the contactor includes a first contactor, a second contactor, and a third contactor.
The control loop comprises a PLC controller and a control power supply; the common end of the PLC is connected with the negative end of the control power supply; and a fuse is connected in series between the common end of the PLC and the negative end of the control power supply. The fuse is connected in series between the COM common end of the PLC controller and the negative end of the control power supply, so that the PLC controller can be immediately fused to play a role in protection when abnormal phenomena such as overcurrent, overvoltage or overheating occur in a circuit, and further expansion of faults can be prevented.
The control circuit further comprises a first knob switch SA1, a fourth contactor, a second knob switch SA2 and a first intermediate relay, wherein the first knob switch is connected with the fourth contactor in series; the first knob switch SA1 is connected with the output end of the PLC; the fourth contactor is connected with the positive end of the control power supply; the second knob switch SA2 is connected with the output end of the PLC; the second knob switch is connected with the first intermediate relay; the first intermediate relay is connected with the positive end of the control power supply.
The conventional push button switch is replaced by the first knob switch SA1 and the second knob switch SA2, so that the first knob switch SA1, the controller, the fourth contactor, the control power supply and the fuse constitute a first latching loop, and the second knob switch SA2, the controller, the first intermediate relay, the control power supply and the fuse constitute a second latching loop. First shutting return circuit and second shutting return circuit's setting for during the operation, no matter when the outage, as long as resume the power supply in the circuit, first knob switch and second knob switch can both be according to the state continuation work of setting for before the outage, avoid going to press the start button by the manual work, have caused the delay in time, bring great loss for production.
The utility model discloses a power supply circuit, including converter, PLC control, second intermediate relay, power flash back, second intermediate relay disconnection, converter shut down, resume the power supply back in the circuit, PLC control second intermediate relay actuation, converter resume the operation between the public terminal of simulation of converter and the operation terminal, second intermediate relay has played the function that control converter operation stopped, and the power supply flash back, second intermediate relay disconnection, converter shut down.
The method comprises the following steps:
step S1, canceling the voltage loss tripping function of a load switch of the power distribution room;
specifically, the no-voltage tripping function of a load switch of the power distribution room is cancelled, after the mains supply is flashed off, the load switch of the power distribution room does not trip, and after the mains supply is recovered, the power supply is automatically recovered for the circuit, so that the time delay caused by manual switching-on is avoided.
Step S2, setting the main loop and the control loop as a locking loop;
specifically, the main circuit and the control circuit are set to be a locking circuit, that is, the button switches in the main circuit and the control circuit are set to be knob switches, so that the main circuit and the control circuit form the locking circuit, in this embodiment, the button switches in the control circuit are set to be a first knob switch SA1 and a second knob switch SA2, after the mains supply is flashed off, the first knob switch SA1 and the second knob switch SA2 do not change the originally set state, and after the circuit recovers the power supply, the first knob switch SA1 and the second knob switch SA2 can continue to work according to the set state before the power off, thereby avoiding that the start button is manually pressed down, causing time delay, and bringing influence to production.
Step S3, the PLC starts a power-down maintaining function and memorizes the running state of the circuit before power-down;
step S4, setting the frequency converter into a fault automatic reset and tracking operation frequency starting mode, and then short-circuiting an analog common terminal COM and an operation terminal run of the frequency converter through a second intermediate relay;
step S5, after the mains supply is cut off, the automatic reclosing switch restores the power supply to the main loop and the control loop through the power distribution room;
step S6, the PLC controller restores relevant function data, controls each contactor, each breaker and each intermediate relay to be sucked, switches on the main loop and the control loop, and the circuit continues to work according to the running state before power failure;
and step S7, the frequency converter tracks the running frequency of the motor after power failure, then starts from the tracked running frequency, and accelerates to recover to the running of the working frequency before power failure, so that the motor is dragged to run normally, automatic and stable reset in a short time is realized, and stable production is ensured.
The invention cancels the no-voltage tripping function of the load switch of the power distribution room and replaces the button switch in the prior circuit with the knob switch, after the mains supply is in the flash off, the load switch can not be tripped, so that the mains supply can automatically recover the power supply to the main loop and the control loop after automatic reclosing without manual closing, thereby avoiding time delay, the PLC controller memorizes the running state of the circuit before power failure due to the starting of the power failure maintaining function, after the power supply is recovered, the knob switch works according to the set state before power failure without manual closing, the PLC controller recovers the related functional data, the circuit can continue to work according to the running state before power failure, the frequency converter tracks the running frequency of the motor after power failure by tracking the running frequency starting function, then starts from the tracked running frequency and accelerates to recover to the normal running frequency, thereby drag the motor normal operating, avoid by artifical combined floodgate resume power supply and the converter from the condition of 0HZ start-up, guaranteed the normal operating of converter to major economic loss and potential safety risk have been avoided.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (3)
1. A method for dealing with power supply flash-off comprises a main loop, a control loop, a power distribution room and a mains supply; the method is characterized in that: the main loop and the control loop are respectively connected with a power distribution room; the power distribution room is connected with a mains supply and is used for supplying power to the main loop and the control loop; the main loop comprises a frequency converter, a motor, a plurality of circuit breakers and a plurality of contactors; the input ends of the circuit breakers are connected with the power distribution room, and the output ends of the circuit breakers are connected with the frequency converter; the input ends of the contactors are connected with the frequency converter; the output ends of the contactors are connected with the motor; the circuit breakers comprise a first circuit breaker, a second circuit breaker and a third circuit breaker; the contactor comprises a first contactor, a second contactor and a third contactor; the control loop comprises a PLC controller; the common end of the PLC is connected with the negative end of the control power supply; the control circuit further comprises a first knob switch, a fourth contactor, a second knob switch and a first intermediate relay, wherein the first knob switch is connected with the fourth contactor in series; the first knob switch is connected with the output end of the PLC; the fourth contactor is connected with the positive end of the control power supply; the second knob switch is connected with the output end of the PLC; the second knob switch is connected with the first intermediate relay; the first intermediate relay is connected with the positive end of the control power supply; the controller, the second knob switch, the first intermediate relay, the control power supply and the fuse form a second locking loop; when power supply is recovered in the circuit, the PLC controller controls the fourth contactor and the first intermediate relay to be attracted; a fuse is connected in series between the common end of the PLC and the negative end of the control power supply; the PLC controller, the first knob switch, the fourth contactor, the control power supply and the fuse form a first locking loop; the method comprises the following steps:
step S1, canceling the voltage loss tripping function of the load switch of the power distribution room;
step S2, the main loop and the control loop adopt a locking loop;
step S3, the PLC starts a power-down maintaining function and memorizes the running state of the circuit before power-down;
step S4, setting the frequency converter to a fault automatic reset and tracking operation frequency starting mode;
step S5, after the mains supply is cut off, the automatic reclosing switch restores the power supply to the main loop and the control loop through the power distribution room;
step S6, the PLC controller restores the relevant function data, and the circuit continues to work according to the running state before power failure;
and step S7, the frequency converter tracks the running frequency of the motor after power failure, then starts from the tracked running frequency, and accelerates to recover to the normal working frequency to run.
2. The method for dealing with the power source flash-off as claimed in claim 1, wherein the PLC controller controls the first circuit breaker, the second circuit breaker, the third circuit breaker, the first contactor, the second contactor and the third contactor to be closed when the power supply is restored in the circuit.
3. A method of handling power supply glitches of claim 1 in which a second intermediate relay is connected in series between the analog common and operational terminals of the frequency converter; and after power supply is recovered in the circuit, the PLC controls the second intermediate relay to be sucked, and the analog common terminal of the frequency converter is connected with the operation terminal.
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| CN202010670443.7A CN111865176B (en) | 2020-07-13 | 2020-07-13 | Method for coping with power supply flash |
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| CN202010670443.7A CN111865176B (en) | 2020-07-13 | 2020-07-13 | Method for coping with power supply flash |
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| CN111865176B true CN111865176B (en) | 2022-03-22 |
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Address after: 526124 Bai Tu Yi and ER Cun, Lubu Town, Gaoyao District, Zhaoqing City, Guangdong Province Patentee after: New Pearl (Guangdong) New Materials Co.,Ltd. Patentee after: New Pearl Group Co.,Ltd. Patentee after: Foshan Sanshuiguanzhu Ceramics Co.,Ltd. Address before: 526124 Bai Tu Yi and ER Cun, Lubu Town, Gaoyao District, Zhaoqing City, Guangdong Province Patentee before: GUANGDONG SUMMIT CERAMICS Co.,Ltd. Patentee before: New Pearl Group Co.,Ltd. Patentee before: Foshan Sanshuiguanzhu Ceramics Co.,Ltd. |
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