CN110593355A - Water supply energy consumption reduction method based on pressure control model and PLC - Google Patents
Water supply energy consumption reduction method based on pressure control model and PLC Download PDFInfo
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- CN110593355A CN110593355A CN201910953558.4A CN201910953558A CN110593355A CN 110593355 A CN110593355 A CN 110593355A CN 201910953558 A CN201910953558 A CN 201910953558A CN 110593355 A CN110593355 A CN 110593355A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 137
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005265 energy consumption Methods 0.000 title claims abstract description 10
- 230000009467 reduction Effects 0.000 title claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 230000007246 mechanism Effects 0.000 claims description 20
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- 238000004364 calculation method Methods 0.000 claims description 5
- 230000002068 genetic effect Effects 0.000 claims description 5
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Classifications
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B5/00—Use of pumping plants or installations; Layouts thereof
-
- 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
-
- 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
- E03B7/075—Arrangement of devices for control of pressure or flow rate
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention provides a water supply energy consumption reducing method based on a pressure control model and a PLC (programmable logic controller), belonging to the technical field of water supply. According to the pressure value of using water pipe network real-time feedback, the automatic pump that falls of power frequency conversion switching and the accumulative total timing of each water pump of automatic control simultaneously adjusts water supply system according to real-time water pressure deviation, assigns the control parameter for the converter, and by the converter regulation water pump operating frequency, the water supply flow of adjusting water pipe network finally reaches the purpose that makes water supply pressure stable and energy saving and consumption reduction.
Description
Technical Field
The invention relates to a water supply technology, in particular to a water supply energy consumption reducing method based on a pressure control model and a PLC.
Background
China is a country with water resource shortage, and the technology in the aspects of municipal water supply, high-rise building water supply, industrial production circulating water supply and the like is lagged behind for a long time, and the automation level is low. With the development of social economy in China, the living standard of people is continuously improved, various cells in cities are continuously increased, and the requirement on the construction of urban water supply infrastructure is higher and higher. The reliability, stability and economy of water supply directly affect the normal life and work of people.
The traditional water supply mode comprises the following steps: constant speed pump pressurized water supply, water tower high-level water tank water supply, air pressure tank water supply and the like. They generally waste hydraulic and electric power resources to different degrees; the efficiency is low; the reliability is poor; the automation degree is not high. At present, the water supply mode is developing towards high efficiency, energy saving, automation and reliability.
Disclosure of Invention
In order to solve the technical problems, the invention provides a water supply energy consumption reducing method based on a pressure control model and a PLC (programmable logic controller), and aims to reduce water supply energy consumption and effectively stabilize the pressure of a pipe network.
The technical scheme of the invention is as follows:
a method for reducing energy consumption of water supply based on a pressure control model and a PLC (programmable logic controller) is a closed-loop automatic control system formed by combining a calculation result of the pressure control model and a PLC control system with water supply. And calculating an optimal pressure control curve by adopting a hybrid genetic method, sending the optimal pressure control curve to a PLC (programmable logic controller), adjusting the flow by adopting a water pump rotating speed adjusting method, and uniformly scheduling the operation of the water pump unit. According to the pressure value of using water pipe network real-time feedback, the automatic pump that falls of power frequency conversion switching and the accumulative total timing of each water pump of automatic control simultaneously adjusts water supply system according to real-time water pressure deviation, assigns the control parameter for the converter, and by the converter regulation water pump operating frequency, the water supply flow of adjusting water pipe network finally reaches the purpose that makes water supply pressure stable and energy saving and consumption reduction.
Further, in the above-mentioned case,
establishment of pressure control model
An empirical mathematical expression established using a hybrid genetic algorithm, as follows:
wherein Q is the flow of each water plant, hk is the pressure of each measuring point, and Ci, Ajm and Bjp can be obtained by monthly flow calculation; the pipe network pressure curve model needs to meet the optimal relation between delivery flow and pressure and the pressure at the worst point; and according to the real-time pressure curve output by the pressure control model, the real-time pressure curve is used as a set pressure value of the PLC control system.
Further, in the above-mentioned case,
establishment of PLC control system
The PLC control system mainly comprises a variable frequency speed regulator, a PLC controller, a pressure sensor and a water pump unit; the system can be generally divided into three major parts: signal detection portion, control mechanism and actuating mechanism.
1) The signal detection section: and feeding back signals required to be detected by the water supply system to the control system.
2) The control mechanism: the PLC and the variable frequency speed regulator are the core;
the water pipe network water pressure value, the buffer tank liquid level value and the motor or frequency converter alarm signal fed back by the signal detection mechanism in real time need to be processed by a PLC, a control instruction is sent to the frequency conversion speed regulator, and the frequency converter performs PID regulation to control the operation of a water pump motor;
it is also responsible for the information exchange of the setting information of the man-machine interface and the transmission communication interface.
The variable frequency speed regulator is the core equipment for the system to realize speed regulation control of the water pump motor, and performs PID control and speed regulation on the water pump motor according to a control signal transmitted by a PLC and a real-time water pressure signal transmitted by a sensor.
3) The executing mechanism: the actuating mechanism is a water pump set, and the task of water delivery of the system is finally completed by the actuating mechanism and the water pump set; when the water demand is maximum, the water pump set is completely put into power frequency operation;
the frequency conversion/power frequency operation and switching control of the water pump are determined by the urgency degree of water demand, namely the pressure difference value between the water pressure value fed back by the water pipe network in real time and the set pressure value.
The invention has the advantages that
(1) Maintaining the water pressure of the water using pipe network to be stable;
(2) the system can be automatically/manually operated, and can be suddenly stopped in an emergency;
(3) the power frequency/frequency conversion work of the water pump is automatically switched, and the water pump is automatically reversed;
(4) the manual operation and the automatic operation can lead the water pump to operate in a frequency conversion way;
(5) the system can realize the sleep function when no water is needed, and the system automatically wakes up after the water is needed;
(6) and displaying and alarming the system running state.
Drawings
FIG. 1 is a schematic diagram of a PLC control program;
fig. 2 is an overall analysis diagram.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
When urban water supply, through the pressure value that pressure control model output PLC control system set for, PLC control system compares real-time pipe network water pressure value and the pressure value that the system set for, reachs difference between them by the PLC controller, assigns control information afterwards for the converter, finally by the rotational speed lift of converter control water pump motor, the realization is stabilized the effect at the set pressure value with water pressure, reaches the purpose that reduces the energy consumption.
Establishment of pressure control model
The pressure control model is based on a large amount of historical measured data of water supply pressure and water supply flow of a water plant, water tower water level and pipe network monitoring point pressure, and an empirical mathematical expression established by a hybrid genetic algorithm is applied, and the empirical mathematical expression is as follows:
wherein Q is the flow of each water plant, hk is the pressure of each measuring point, and Ci, Ajm and Bjp can be obtained by monthly flow calculation. The pipe network pressure curve model needs to meet the optimal relation between the factory flow and the pressure at the worst point. And according to the real-time pressure curve output by the pressure control model, the real-time pressure curve is used as a set pressure value of the PLC control system.
Establishment of PLC control system
The PLC has powerful control function, can monitor and adjust various parameters of the system, has strong anti-interference capability and certain capacity expansion capability, and has communication interface reservation, thereby realizing the functions of unified water supply scheduling and monitoring of modern cities.
The PLC control system mainly comprises a variable frequency speed regulator, a PLC controller, a pressure sensor and a water pump unit. The system can be generally divided into three major parts: the signal detection part, the control mechanism and the execution mechanism, the function and the working flow of each part are described in detail as follows:
(1) the signal detection section: and feeding back signals to be detected of the water supply system to the control system, such as: real-time water pressure signals are transmitted by using a water pipe network, liquid level signals of the water inlet buffer tank and all alarm signals of the system. The water pressure signal of the water pipe network is a water pressure value acquired by real-time feedback of a pressure sensor, and is the most important feedback measurement signal in a water supply system, and the feedback measurement signal is an analog quantity signal.
(2) A control mechanism: the PLC controller and the variable frequency speed regulator are the core of the device, and other electric control cabinet components are also arranged.
The PLC controller can be said to be a core in the core of the water supply control system. The water pipe network water pressure value, the buffer tank liquid level value and the motor or the frequency converter alarm signal fed back by the signal detection mechanism in real time need to be processed by a PLC, a control instruction is sent to the frequency conversion speed regulator, and the frequency converter performs PID regulation to control the operation of the water pump motor. It is also responsible for the information exchange of the setting information of the man-machine interface and the transmission communication interface.
The variable frequency speed regulator is the core equipment for the system to realize speed regulation control of the water pump motor, and performs PID control and speed regulation on the water pump motor according to a control signal transmitted by a PLC and a real-time water pressure signal transmitted by a sensor.
(3) An executing mechanism: the execution mechanism is 3 water pump sets, and the task of water delivery of the system is finally completed by the water pump sets. When the water demand is maximum, can all put into power frequency operation with these three water pumps. The frequency conversion/power frequency operation and switching control of the water pump are determined by the urgency degree of water demand, namely the pressure difference value between the water pressure value fed back by the water pipe network in real time and the set pressure value.
The invention is based on the accurate water supply of pressure control model and PLC control and integrates big data, machine learning, frequency conversion technology, electrical technology and modern control technology. The method can improve the stability and reliability of the water supply system, and the system has good energy-saving performance, which is particularly important at present when the energy is increasingly in short supply. Therefore, the method has important practical significance in the aspects of improving the efficiency of water supply enterprises, improving the living standard of people, reducing energy consumption and the like.
The above description is only a preferred embodiment of the present invention, and is only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A water supply energy consumption reduction method based on a pressure control model and a PLC is characterized in that,
through the pressure value that pressure control model output PLC control system set for, PLC control system compares real-time pipe network water pressure value and the pressure value that the system set for, reachs difference between them by the PLC controller, assigns control information afterwards and gives the converter, finally goes up and down by the rotational speed of converter control water pump motor, realizes stabilizing the effect at the set pressure value with water pressure.
2. The method of claim 1,
and the water supply is combined with the calculation result of the pressure control model and the PLC control system to form a closed-loop automatic control system.
3. The method of claim 2,
and calculating an optimal pressure control curve by adopting a hybrid genetic method, sending the optimal pressure control curve to a PLC (programmable logic controller), adjusting the flow by adopting a water pump rotating speed adjusting method, and uniformly scheduling the operation of the water pump unit.
4. The method of claim 3,
according to the pressure value of using the real-time feedback of water pipe network, the automatic pump that falls of power frequency conversion switching and the accumulative total timing of each water pump of automatic control adjusts water supply system according to real-time water pressure deviation simultaneously, assigns the control parameter for the converter, adjusts the water supply flow of water pipe network by the converter regulation water pump operating frequency, regulation.
5. The method of claim 4,
establishment of pressure control model
An empirical mathematical expression established using a hybrid genetic algorithm, as follows:
wherein Q is the flow of each water plant, hk is the pressure of each measuring point, and Ci, Ajm and Bjp can be obtained by monthly flow calculation; the pipe network pressure curve model needs to meet the optimal relation between delivery flow and pressure and the pressure at the worst point; and according to the real-time pressure curve output by the pressure control model, the real-time pressure curve is used as a set pressure value of the PLC control system.
6. The method according to claim 4 or 5,
establishment of PLC control system
The PLC control system mainly comprises a variable frequency speed regulator, a PLC controller, a pressure sensor and a water pump unit; the system can be generally divided into three major parts: signal detection portion, control mechanism and actuating mechanism.
7. The method of claim 6,
the signal detection section: and feeding back signals required to be detected by the water supply system to the control system.
8. The method of claim 6,
the control mechanism: the PLC and the variable frequency speed regulator are the core;
the water pipe network water pressure value, the buffer tank liquid level value and the motor or frequency converter alarm signal fed back by the signal detection mechanism in real time need to be processed by a PLC, a control instruction is sent to the frequency conversion speed regulator, and the frequency converter performs PID regulation to control the operation of a water pump motor;
and the system is also responsible for the information exchange of the setting information of the man-machine interface and the transmission communication interface.
9. The method of claim 8,
the variable frequency speed regulator is a core device for realizing speed regulation control of the water pump motor by the system, and performs PID control and speed regulation on the water pump motor according to a control signal transmitted by the PLC and a real-time water pressure signal transmitted by the sensor.
10. The method of claim 8,
the executing mechanism: the actuating mechanism is a water pump set, and the task of water delivery of the system is finally completed by the actuating mechanism and the water pump set; when the water demand is maximum, the water pump set is completely put into power frequency operation;
the frequency conversion/power frequency operation and switching control of the water pump are determined by the urgency degree of water demand, namely the pressure difference value between the water pressure value fed back by the water pipe network in real time and the set pressure value.
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| CN201910953558.4A CN110593355A (en) | 2019-10-09 | 2019-10-09 | Water supply energy consumption reduction method based on pressure control model and PLC |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112000143A (en) * | 2020-08-07 | 2020-11-27 | 河北利万信息科技有限公司 | Method for controlling water supply pressure by operation feedback signal in PID control |
| CN117891206A (en) * | 2024-03-15 | 2024-04-16 | 福州智水匠数字科技有限公司 | Energy-saving pump set operation control system integrating pipe network model intelligent algorithm |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112000143A (en) * | 2020-08-07 | 2020-11-27 | 河北利万信息科技有限公司 | Method for controlling water supply pressure by operation feedback signal in PID control |
| CN112000143B (en) * | 2020-08-07 | 2022-10-21 | 河北利万信息科技有限公司 | Method for controlling water supply pressure by operation feedback signal in PID control |
| CN117891206A (en) * | 2024-03-15 | 2024-04-16 | 福州智水匠数字科技有限公司 | Energy-saving pump set operation control system integrating pipe network model intelligent algorithm |
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