CN112018720A - Power failure protection method and protection system of power supply system based on PLC control - Google Patents
Power failure protection method and protection system of power supply system based on PLC control Download PDFInfo
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- CN112018720A CN112018720A CN201910472586.4A CN201910472586A CN112018720A CN 112018720 A CN112018720 A CN 112018720A CN 201910472586 A CN201910472586 A CN 201910472586A CN 112018720 A CN112018720 A CN 112018720A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/027—Details with automatic disconnection after a predetermined time
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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Abstract
The invention discloses a power failure protection method and a power failure protection system of a power supply system based on PLC control, wherein the power failure protection method of the power supply system based on PLC control comprises the following steps that 1) the power supply state of a power supply cable is collected, if the power supply cable has power failure, the power supply cable is immediately disconnected from a load, and a main timer is started; 2) if the power supply cable recovers power supply, stopping the main timer and starting the auxiliary timer, simultaneously judging whether the timing time of the main timer exceeds a first preset time, if so, keeping the power supply of the load disconnected, and if not, switching on the power supply of the load; 3) and if the power supply cable is powered off again, starting the main timer and stopping the auxiliary timer, if the timing time of the auxiliary timer exceeds a second preset time, returning to the step 2), and if the power supply cable is not powered off, keeping the load power supply disconnected.
Description
Technical Field
The invention belongs to the technical field of power supply control, and particularly relates to a power failure protection method and a power failure protection system of a power supply system based on PLC control.
Background
Some factories have special requirements on power supply systems, power failure can inevitably occur in the production process, once power failure occurs (external power grid), production equipment stops running immediately, power supply can be recovered in a short time to continue production under the requirement of a production process, but power supply is recovered after long-time power failure, continuous production is not allowed, otherwise, adverse effects such as damage to products can be caused, and the like are caused, so that the power supply systems are required to adopt different treatments according to the length of power failure time. During the power failure, the power supply system control device can continuously work under the guarantee of UPS (power supply control), the control program times the power failure time, and power supply recovery or operation stop processing is carried out according to the power failure time length.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a power failure protection method of a power supply system based on PLC control, which effectively improves the power supply safety.
The invention is realized by the following technical scheme:
a power failure protection method of a power supply system based on PLC control comprises the following steps,
1) acquiring the power supply state of a power supply cable, and immediately disconnecting the power supply cable from a load and starting a main timer if the power supply cable is out of power;
2) if the power supply cable recovers power supply, stopping the main timer and starting the auxiliary timer, simultaneously judging whether the timing time of the main timer exceeds a first preset time, if so, keeping the power supply of the load disconnected, and if not, switching on the power supply of the load;
3) and if the power supply cable is powered off again, starting the main timer and stopping the auxiliary timer, if the timing time of the auxiliary timer exceeds a second preset time, returning to the step 2), and if the power supply cable is not powered off, keeping the load power supply disconnected.
In the above technical solution, the first preset time is 60-900s, and the second preset time is 30-150 s.
In the above technical solution, the first preset time is 90s, and the second preset time is 60 s.
In the above technical solution, the first preset time is 150s, and the second preset time is 90 s.
In the above technical solution, the load is powered by a power supply connected to the power supply cable, and the power supply is immediately cut off and started when the power supply cable is powered off in step 1).
In the above technical solution, the power supply is a frequency converter, and the start command of the frequency converter is cancelled while the power supply of the load is kept disconnected in the step 2) and the step 3).
In the technical scheme, the keeping of the power supply disconnection of the load is realized by the controlled execution of the contactor.
The utility model provides a power supply system power failure protection system based on PLC control, includes the acquisition circuit who is used for gathering supply cable power supply state, by the power of supply cable energy supply, the power supply output of power communicate through contactor and load, acquisition circuit, power and contactor be connected with the controller is controllable respectively.
In the above technical solution, the controller is a PLC module, the PLC module includes a CPU module and a digital input/output module, the digital input module is used for acquiring a power failure signal of the power supply, the digital output module is responsible for sending a power supply start signal and a contactor control signal, and the CPU module executes a power failure protection program according to the power failure signal.
In the above technical solution, the controller is powered by a UPS.
The invention has the advantages and beneficial effects that:
the invention can meet different requirements of operation processes of factories or laboratories on the power supply system according to the length and frequency interval of the power failure time, the power failure time is short (within a certain time), and after the power supply is recovered from the outside, the power supply system can automatically recover to the operation state before the power failure without the operation of operators. If the power failure time exceeds a certain requirement, if the power failure frequency is large, the automatic power restoration is automatically forbidden, and the accident is avoided. The invention effectively ensures the safety of experimental equipment by taking the two-dimensional consideration of the power failure time.
Drawings
Fig. 1 is a flow chart of a power failure protection program of the power supply system power failure protection method based on PLC control according to the present invention.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
Example one
A power failure protection method of a power supply system based on PLC control,
1) acquiring the power supply state of a power supply cable, and immediately disconnecting the power supply cable from a load and starting a main timer if the power supply cable is out of power;
2) if the power supply cable recovers power supply, stopping the main timer and starting the auxiliary timer, simultaneously judging whether the timing time of the main timer exceeds a first preset time, if so, keeping the power supply of the load disconnected, and if not, switching on the power supply of the load;
3) and if the power supply cable is powered off again, starting the main timer and stopping the auxiliary timer, if the timing time of the auxiliary timer exceeds a second preset time, returning to the step 2), and if the power supply cable is not powered off, keeping the load power supply disconnected.
The load is powered by a power supply communicated with a power supply cable, the power supply is immediately cut off and started when the power supply cable is powered off in the step 1), the power supply is a frequency converter, and the starting command of the frequency converter is cancelled while the power supply of the load is kept disconnected in the steps 2) and 3). Keeping the load power supply disconnected is realized by the controlled execution of the contactor.
As a specific real-time manner, the first preset time is 60-900s, and the second preset time is 30-150s, for example, the first preset time is 90s, and the second preset time is 60 s. Namely, the power failure time is less than 90 seconds, the running state of the power supply is automatically recovered, and if the power failure time exceeds 90 seconds, the power supply is prohibited from automatically recovering running. And if the power supply is recovered within 90 seconds and the power supply is cut off again within 60 seconds, the automatic recovery operation of the power supply is forbidden. Or may be set separately according to actual requirements and the power grid, for example, the first preset time is 150s, and the second preset time is 90 s.
The invention can meet different requirements of operation processes of factories or laboratories on the power supply system according to the length and frequency interval of the power failure time, the power failure time is short (within a certain time), and after the power supply is recovered from the outside, the power supply system can automatically recover to the operation state before the power failure without the operation of operators. If the power failure time exceeds a certain requirement, if the power failure frequency is large, the automatic power restoration is automatically forbidden, and the accident is avoided. The invention effectively ensures the safety of experimental equipment by taking the two-dimensional consideration of the power failure time.
Example two
The power failure protection device of the power supply system based on PLC control comprises an acquisition circuit used for acquiring the power supply state of a power supply cable and a power supply powered by the power supply cable, wherein the power supply output of the power supply is communicated with a load through a contactor, and the acquisition circuit, the power supply and the contactor are respectively in controllable connection with a controller. The acquisition circuit is used for acquiring the state of a power supply cable, namely a power supply grid, detecting and generating a power failure signal and recovering the power supply signal, and rectifies one-phase alternating current of an external power grid into direct current 24V to realize signals.
Specifically, the controller is a PLC module, the PLC module includes a CPU module and a digital input/output module, the digital input module is used to collect a power failure signal of the power supply, the digital output module is responsible for sending a power supply start signal and a contactor control signal, and the CPU module executes a power failure protection program according to the power failure signal.
The controller is powered by the UPS, the connection between the controller and the load can be cut off by acquiring a power failure signal and programming software by utilizing the configured PLC module, the state feedback of the power supply and the contactor can be acquired by the digital quantity input module, if the power supply and the contactor are completely disconnected or completely closed, and the like.
Fig. 1 is a flow chart of a power failure protection program, which comprises the following steps:
(I) initialization
The main program entry, start initialization, S1.
(II) power failure
After the initialization, the program first detects whether there is a power failure signal to determine whether the power has failed, S2.
(III) disconnecting the output
When the power failure signal is received, the connection to the load is immediately disconnected S3.
(IV) timing of power failure
The power outage signal triggers the main timer T0, and the main timer T0 starts counting time, S4.
(V) restoring the power supply
If the power failure signal disappears, the power supply is resumed S5.
(VI) Main timer stop
The main timer T0 is stopped, and if the time length of the main timer T0 exceeds 90 seconds, it jumps to S2 or S12 to actually perform the cancellation of the start, and if the time length of the main timer T0 is less than 90 seconds, it performs the next step, S6.
(VII) starting Power supply
The main timer T0 has a duration less than 90 seconds, and transmits a power activation signal S7.
(VIII) switch on output
After the power supply activation signal is transmitted, the output is turned on, S8.
(IX) timing of Power failure
The disappearance of the power outage signal triggers the auxiliary timer T1, S9.
(X) power failure
A power outage signal is received S10.
(XI) Secondary timer stop
And (3) receiving a power supply power failure signal, stopping the auxiliary timer T1, jumping to S7 if the time length of the auxiliary timer T1 exceeds 60 seconds, and starting the power supply, and executing the next step S11 if the time length of the auxiliary timer T1 is less than 60 seconds.
(XII) automatic start with power failure cancellation
Cancellation of power outage auto-start S11.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (10)
1. A power failure protection method of a power supply system based on PLC control is characterized in that: comprises the following steps of (a) carrying out,
1) acquiring the power supply state of a power supply cable, and immediately disconnecting the power supply cable from a load and starting a main timer if the power supply cable is out of power;
2) if the power supply cable recovers power supply, stopping the main timer and starting the auxiliary timer, simultaneously judging whether the timing time of the main timer exceeds a first preset time, if so, keeping the power supply of the load disconnected, and if not, switching on the power supply of the load;
3) and if the power supply cable is powered off again, starting the main timer and stopping the auxiliary timer, if the timing time of the auxiliary timer exceeds a second preset time, returning to the step 2), and if the power supply cable is not powered off, keeping the load power supply disconnected.
2. The power failure protection method of the power supply system based on the PLC control as claimed in claim 1, wherein: the first preset time is 60-900s, and the second preset time is 30-150 s.
3. The power failure protection method of the power supply system based on the PLC control as claimed in claim 1, wherein: the first preset time is 90s, and the second preset time is 60 s.
4. The power failure protection method of the power supply system based on the PLC control as claimed in claim 1, wherein: the first preset time is 150s, and the second preset time is 90 s.
5. The power failure protection method of the power supply system based on the PLC control as claimed in claim 1, wherein: the load is powered by a power supply communicated with the power supply cable, and the power supply is immediately cut off and started when the power supply cable is powered off in the step 1).
6. The power failure protection method of the power supply system based on the PLC as claimed in claim 5, wherein: the power supply is a frequency converter, and the starting command of the frequency converter is cancelled while the power supply of the load is kept disconnected in the step 2) and the step 3).
7. The power failure protection method of the power supply system based on the PLC control as claimed in claim 1, wherein: keeping the load power supply disconnected is realized by the controlled execution of the contactor.
8. The utility model provides a power supply system power failure protection system based on PLC control, its characterized in that, including the acquisition circuit who is used for gathering supply cable power supply state, by the power of supply cable energy supply, the power output of power communicate through contactor and load, acquisition circuit, power and contactor be connected with the controller is controllable respectively.
9. The PLC-based power failure protection system of claim 8, wherein the controller is a PLC module, the PLC module includes a CPU module and a digital input/output module, the digital input module is configured to collect a power failure signal of the power supply, the digital output module is configured to send a power supply start signal and a contactor control signal, and the CPU module executes a power failure protection program according to the power failure signal.
10. The PLC based power supply system outage protection system of claim 8, wherein the controller is powered by a UPS.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910472586.4A CN112018720A (en) | 2019-05-31 | 2019-05-31 | Power failure protection method and protection system of power supply system based on PLC control |
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| CN201910472586.4A CN112018720A (en) | 2019-05-31 | 2019-05-31 | Power failure protection method and protection system of power supply system based on PLC control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113138653A (en) * | 2021-04-14 | 2021-07-20 | 福州富昌维控电子科技有限公司 | Power failure data protection method and terminal |
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