CN110259660A - A kind of Expert Rules PID constant pressure water supply system and method based on PLC - Google Patents
A kind of Expert Rules PID constant pressure water supply system and method based on PLC Download PDFInfo
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- CN110259660A CN110259660A CN201910529112.9A CN201910529112A CN110259660A CN 110259660 A CN110259660 A CN 110259660A CN 201910529112 A CN201910529112 A CN 201910529112A CN 110259660 A CN110259660 A CN 110259660A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005070 sampling Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000003044 adaptive effect Effects 0.000 abstract description 10
- 239000008400 supply water Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
- E03B11/10—Arrangements or adaptations of tanks for water supply for public or like main water supply
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B23/00—Pumping installations or systems
- F04B23/04—Combinations of two or more pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Computer Hardware Design (AREA)
- Feedback Control In General (AREA)
Abstract
A kind of Expert Rules PID constant pressure water supply system and method based on PLC, system are made of water pump, frequency converter and PLC etc., and pressure sensor predominantly detects pump outlet pressure, are then passed data to PLC and are carried out feedback with the hydraulic pressure value of setting and compare.After carrying out calculation processing in PLC, CPU issues control signal, is adjusted to pump motor revolving speed and controls water pump number of units, stablizes pump outlet pressure near given pressure.By improving to traditional PI D, addition Expert Rules library allows to carry out adaptive control and autotuning online into traditional PI D control system and method for the invention.So that it is quickly tracked hydraulic parameters setting value by changing water pump asynchronous machine frequency to control water, reach the control to pressure of supply water, realizes the automation control to water system.The system can be realized that pid parameter is adaptive, improve the stability of water system, and can carry out parameters on line modifying, be conducive to the rapidity for improving water system.
Description
Technical field
The present invention relates to automation controls, and in particular to a kind of Expert Rules PID constant pressure water supply system and side based on PLC
Method.
Background technique
In China, because of the management in the construction in city and city, needed for the water source of resident living or workshop production
It is all to be provided by the water supply network of Running-water Company with water.But due to the limitation of technology, the hydraulic pressure of water supply be can only achieve
0.35-0.4Mpa is only the offer that user lives at eight layers or less and supplies water.Forward, city is on the middle and senior level for the big step of nation-building
Building construction is constantly added, and provides the water supply and fire-fighting confession that feed pressure has been unable to satisfy skyscraper with current water system
The requirement of water.And in the water system of China small and medium-sized cities comparatively the equipment of control section is relatively backward, for equipment
Control mainly rely on manual control.It is too low to control precision, therefore supply equipment is in high loaded process state, water pipe sometimes
Interior hydraulic pressure is in superpressure state, and not only inefficiency is also very big to the consumption of the energy for consequence, but also urban pipe network is chronically at
The operation of superpressure state, the service life that pipe network uses can also shorten.
Foreign countries to water system construction with state-of-the-art technology be exactly varying speed and constant pressure feed water technology.According to day
The continuous improvement of automatization level in preceding production, converter technique obtain rapid development, in production of living it may be said that most
There is the figure of frequency converter.More it is worth happiness, converter technique has been applied in water system, can be with according to frequency converter
The adjusting realized and carry out revolving speed to motor is adjusted to frequency, to realize the regulation of the water flow provided water pump, enables system
While automatization level of uniting improves, stability, the efficiency of system are also improved, also has indirect help to the saving of the energy, but
It there are the shortcomings that be that cannot achieve the adaptive behavior of pid parameter, and can not carry out PID relevant parameter online from whole
It is fixed.
The method used that mainly supplies water at present mainly has:
(1) manual control mode, it is low that this mode controls precision, and inefficiency is big to energy consumption and public supply mains
Load is very big.
(2) Frequency Converter Control mode, this mode frequency are adjusted using frequency converter the adjusting realized to pump rotary speed
Reach the control to water flow pressure, this mode is improved compared with first way the degree of automation, more stability and high efficiency, but this side
Formula disadvantage can not make pid parameter adaptive, no decree pid parameter online self-tuning etc..
(3) PLC+ Frequency Converter Control mode, this mode carry out processing to traditional pid parameter using PLC Programming and issue
It is controlled into frequency converter, two ways is more efficient earlier above for this mode, and the degree of automation is more increased, and disadvantage utilizes PLC pairs
Traditional PI D programming can not still carry out the adaptive processing operation of online self-tuning to pid parameter.
Summary of the invention
The purpose of the present invention is to provide a kind of new control strategies can not be carried out online with changing traditional pid parameter from whole
Fixed adaptive defect reduces the consumption to the energy while improving the stability and the degree of automation of control system.
For achieving the above object, technical solution of the present invention is specific as follows:
A kind of Expert Rules PID constant pressure water supply system based on PLC, including the first water pump, the second water pump, the first frequency conversion
Device, the second frequency converter, first pressure sensor, second pressure sensor and PLC, the first frequency converter are connected with the first water pump, the
Two frequency converters are connected with the second water pump, and first pressure sensor is located in the outlet pipe being connected with the first water pump, and second pressure passes
Sensor is located in the outlet pipe being connected with the second water pump, the data output end point of first pressure sensor and second pressure sensor
It is not connected with the data input pin of PLC, the data output end of PLC is inputted with the data of the first frequency converter and the second frequency converter respectively
End is connected, and PLC regulates and controls the first frequency converter and second according to the first pressure sensor, the data of second pressure sensor that receive
The state of frequency converter.
It further, further include touch screen, touch screen is connected with PLC.
A kind of Expert Rules PID constant pressure water supply method based on PLC, including, system start switch is opened, and the first water pump becomes
Frequency starts, the feedback hydraulic pressure in the first sensor acquisition outlet pipe being connected with the first water pump at this time and be transferred in PLC and
Setting value is compared；
If value of feedback is identical as given value, after PLC adjusts tri- parameters of PID according to the rule in Expert Rules library
Corresponding control command is issued to the first frequency converter；If value of feedback is different from given value, the first water pump continues converting operation, later
Value of feedback is monitored again；
After Expert Rules execute, whether the running frequency of PLC monitoring system pump motor reaches power frequency 50Hz, if first
Water pump then continue if not reaching power frequency at this time keep converting operation again again monitor pipe network in water column feedback value whether with set
Definite value is identical；If reaching power frequency, whether identical as setting value value of feedback is monitored, if value of feedback is identical as setting value, keep the
One water pump power frequency operation, if value of feedback is different from setting value, the first water pump power frequency remains operational the starting of the second pump variable frequency.
Further, the rule in the Expert Rules library are as follows:
Enabling e (k) is the sampling error value at k moment, then when e (k-1) and e (k-2) are respectively previous moment and the first two
The sampling error value at quarter；
Δ e (k)=e (k)-e (k-1)
Δ e (k-1)=e (k-1)-e (k-2)
(1) as | e (k) | > ε1, show that Error Absolute Value is very big, increase or reduce output at this time and carry out alignment error,
Using PD control；
(2) work as ε2< | e (k) |≤ε1And e (k) Δ e (k) > 0, show that error is increasing, selects PID control come change property
Energy index, k at this timepSelect the larger value；
(3) work as ε2< | e (k) |≤ε1And e (k) Δ e (k)≤0, show that error is reducing or having reached balance, selects at this time
It is controlled with PID, kpSelect smaller value；
(4) as | e (k) |≤ε2, show Error Absolute Value very little, select PI control to reduce steady-state error at this time；
Wherein, ε1、ε2For generated limit error absolute value under the good running environment of system that usually observes.
Further, the sampling period is 10s.
Compared with prior art, beneficial effects of the present invention:
For control method of the invention by improving to traditional PI D, addition Expert Rules library makes it can into traditional PI D
To carry out adaptive control and autotuning online.It is set quickly to track hydraulic parameters setting value by changing water pump asynchronous machine frequency to control
Water production reaches the control to pressure of supply water, realizes the automation control to water system.The system can be realized pid parameter
Adaptively, the stability of water system is improved, and parameters on line modifying can be carried out, is conducive to improve the fast of water system
Speed.Expert Rules library write and completes to win in the software of way using trapezoid figure language in Siemens to Expert Rules library later
Middle rule is programmed realization.
Detailed description of the invention
Fig. 1 is system principle diagram of the invention；
Fig. 2 is Expert Rules library functional block diagram of the invention；
Fig. 3 is Method And Principle block diagram of the invention.
Specific embodiment:
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
Embodiment
As shown in Figure 1, a kind of Expert Rules PID constant pressure water supply system based on PLC, system is by water pump, frequency converter and PLC
Etc. constituting, the rotational speed regulation and operating water pump number of units variation of water pump assembly are carried out.Pressure sensor predominantly detects water and pumps out
Mouth of a river pressure, then passes data to PLC and carries out feedback with the hydraulic pressure value of setting and compare.PLC calls Expert Rules PID
After program carries out corresponding adaptive setting to tri- parameters of PID, CPU issues control signal, to pump motor revolving speed be adjusted with
And water pump number of units is controlled, stablize pump outlet pressure near given pressure.
By improving to traditional PI D, addition Expert Rules library allows to carry out online into traditional PI D adaptive
Self-tuning System.So that it is quickly tracked hydraulic parameters setting value by changing water pump asynchronous machine frequency to control water, reaches to confession
The automation control to water system is realized in the control of water pressure.It is adaptive that the system can be realized pid parameter, improves and supplies water
The stability of system, and parameters on line modifying can be carried out, be conducive to the rapidity for improving water system.To Expert Rules
Library write completing to win in the software of way in Siemens later and is programmed using trapezoid figure language to rule in Expert Rules library
It realizes.
Fig. 2 show the rule in Expert Rules library:
Enabling e (k) is the sampling error value at k moment, then when e (k-1) and e (k-2) are respectively previous moment and the first two
The sampling error value at quarter, the sampling period, it is proper to be scheduled on 10s or so after online access herein.
Δ e (k)=e (k)-e (k-1)
Δ e (k-1)=e (k-1)-e (k-2)
(1) as | e (k) | > ε1, show that Error Absolute Value is very big, should consider to increase (reduction) output at this time to adjust
Whole error, Ying Caiyong PD control.
(2) work as ε2< | e (k) |≤ε1And e (k) Δ e (k) > 0 shows that error is increasing, Ying Xuanyong PID control is come change property
Energy index, k at this timepBiggish value should be selected.
(3) work as ε2< | e (k) |≤ε1And e (k) Δ e (k)≤0 shows that error is reducing or having reached balance, if at this time
PID is selected to control kpLesser value should be selected.
(4) as | e (k) |≤ε2, show Error Absolute Value very little, PI control should be selected to miss to reduce stable state at this time
Difference.
ε1、ε2For generated limit error absolute value under the good running environment of system that usually observes.
Fig. 3 show Method And Principle block diagram, and system start switch is opened, and No.1 pump variable frequency starting, sensor acquires this
Shi Shuiguan internal water pressure is transferred to PLC and is compared with setting value, if value of feedback and setting value monitor it is identical if executive expert
Rule P ID subprogram, on the contrary then No.1 pump continue converting operation and monitor value of feedback again.After Expert Rules PID subprogram executes,
The running frequency of monitoring system pump motor whether reach power frequency 50Hz (if No.1 water pump does not reach if power frequency at this time after
Continuation of insurance hold converting operation again again monitor pipe network in water column feedback value it is whether identical as setting value), value of feedback is monitored if reaching
It is whether identical as setting value, it is identical if keep No.1 water pump power frequency operation if being not up to if No.1 water pump power frequency keep fortune
No. two pump variable frequency startings of row.And so on until water column feedback value in pipe network is identical as setting value.
Claims (5)
1. a kind of Expert Rules PID constant pressure water supply system based on PLC, which is characterized in that including the first water pump, the second water pump,
First frequency converter, the second frequency converter, first pressure sensor, second pressure sensor and PLC, the first frequency converter and the first water pump
It is connected, the second frequency converter is connected with the second water pump, and first pressure sensor is located in the outlet pipe being connected with the first water pump, and second
Pressure sensor is located in the outlet pipe being connected with the second water pump, and the data of first pressure sensor and second pressure sensor are defeated
Outlet is connected with the data input pin of PLC respectively, the data output end of the PLC number with the first frequency converter and the second frequency converter respectively
It is connected according to input terminal, PLC regulates and controls the first frequency converter according to the first pressure sensor, the data of second pressure sensor that receive
With the state of the second frequency converter.
2. a kind of Expert Rules PID constant pressure water supply system based on PLC according to claim 1, which is characterized in that also wrap
Touch screen is included, touch screen is connected with PLC.
3. a kind of Expert Rules PID constant pressure water supply method based on PLC, which is characterized in that including, system start switch is opened,
The starting of first pump variable frequency, first sensor acquire the feedback hydraulic pressure in the outlet pipe being connected with the first water pump at this time and transmit
It is compared into PLC with setting value；
If value of feedback is identical as given value, PLC tri- parameters of PID are adjusted according to the rule in Expert Rules library after to the
One frequency converter issues corresponding control command；If value of feedback is different from given value, the first water pump continues converting operation, supervises again later
Survey value of feedback；
After Expert Rules execute, whether the running frequency of PLC monitoring system pump motor reaches power frequency 50Hz, if the first water pump
Then continue if not reaching power frequency at this time keep converting operation again again monitor pipe network in water column feedback value whether with setting value
It is identical；If reaching power frequency, whether identical as setting value value of feedback is monitored, if value of feedback is identical as setting value, keep the first water
Power frequency operation is pumped, if value of feedback is different from setting value, the first water pump power frequency remains operational the starting of the second pump variable frequency.
4. a kind of Expert Rules PID constant pressure water supply method based on PLC according to claim 3, which is characterized in that described
Rule in Expert Rules library are as follows:
Enabling e (k) is the sampling error value at k moment, then e (k-1) and e (k-2) are respectively previous moment and the first two moment
Sampling error value；
Δ e (k)=e (k)-e (k-1)
Δ e (k-1)=e (k-1)-e (k-2)
(1) as | e (k) | > ε1, show that Error Absolute Value is very big, increase or reduce output at this time and carry out alignment error, using PD
Control；
(2) work as ε2< | e (k) |≤ε1And e (k) Δ e (k) > 0, show that error is increasing, PID control is selected to refer to change performance
Mark, k at this timepSelect the larger value；
(3) work as ε2< | e (k) |≤ε1And e (k) Δ e (k)≤0, show that error is reducing or having reached balance, selects at this time
PID control, kpSelect smaller value；
(4) as | e (k) |≤ε2, show Error Absolute Value very little, select PI control to reduce steady-state error at this time；
Wherein, ε1、ε2For generated limit error absolute value under the good running environment of system that usually observes.
5. a kind of Expert Rules PID constant pressure water supply method based on PLC according to claim 4, which is characterized in that described
Sampling period is 10s.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111538230A (en) * | 2020-04-30 | 2020-08-14 | 邯郸钢铁集团有限责任公司 | Design of PID controller and application method in primary control system |
| CN114922254A (en) * | 2022-06-09 | 2022-08-19 | 山东华立供水设备有限公司 | Automatic switching non-negative pressure water supply system and implementation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111538230A (en) * | 2020-04-30 | 2020-08-14 | 邯郸钢铁集团有限责任公司 | Design of PID controller and application method in primary control system |
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| CN114922254B (en) * | 2022-06-09 | 2024-02-09 | 山东华立供水设备有限公司 | Automatic-switching negative-pressure-free water supply system and implementation method thereof |
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