CN116794970A - Variable-frequency constant-pressure water supply control method and system - Google Patents
Variable-frequency constant-pressure water supply control method and system Download PDFInfo
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- CN116794970A CN116794970A CN202310767575.5A CN202310767575A CN116794970A CN 116794970 A CN116794970 A CN 116794970A CN 202310767575 A CN202310767575 A CN 202310767575A CN 116794970 A CN116794970 A CN 116794970A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000008859 change Effects 0.000 claims abstract description 18
- 238000004886 process control Methods 0.000 claims abstract description 10
- 238000004364 calculation method Methods 0.000 claims description 12
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- 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
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The application discloses a variable-frequency constant-pressure water supply control method and system, and belongs to the technical field of water supply. The variable-frequency constant-pressure water supply control method comprises the steps of obtaining a water pressure set value Ps in a pipeline; obtaining a control output value Psc according to a water pressure set value Ps in the pipeline; obtaining a water pressure deviation value Pe in the pipeline according to the control output value Psc; obtaining a water pump rotating speed command v according to the water pressure deviation value Pe in the pipeline; and obtaining the water pump rotating speed command v to complete variable-frequency constant-pressure water supply control. According to the application, the set value change process control module is introduced, and an expert proportional integral control algorithm is used, so that an adjustable space of a proportional integral coefficient is released, and under the working condition that the water pressure deviation is smaller, a larger proportional integral coefficient can be set to improve the water pressure adjusting speed without causing overshoot.
Description
Technical Field
The application belongs to the technical field of water supply, and particularly relates to a variable-frequency constant-pressure water supply control method and system.
Background
The frequency conversion constant pressure water supply system occupies less area, saves energy, has high intelligent degree, is widely applied in the fields of resident living water supply, chemical industry and electric power, and when an algorithm used by the existing frequency conversion constant pressure water supply control system is applied, the water pressure in a pipeline can be quickly rushed to a set value, then the water pressure exceeds the set value to continuously change, namely, an overshoot phenomenon appears, the overshoot phenomenon can be improved by modifying an integral coefficient in the control algorithm, and another problem can appear: the process of regulating the water pressure in the pipeline is too slow. Once a valve in the pipeline is opened or closed, the water pressure in the pipeline is caused to deviate from a set value, and then a lot of time is needed for recovery. Briefly: the existing water supply system has the contradiction that the water pressure overshoot phenomenon and the adjusting speed are not adjustable. It is necessary to improve the working performance of the variable-frequency constant-pressure water supply system and improve the defects existing in the prior system scheme.
Disclosure of Invention
The application aims to: a method and a system for controlling variable-frequency constant-pressure water supply are provided to solve the above problems in the prior art.
The technical scheme is as follows: a frequency conversion constant pressure water supply control method includes:
acquiring a water pressure set value Ps in a pipeline;
obtaining a control output value Psc according to a water pressure set value Ps in the pipeline;
obtaining a water pressure deviation value Pe in the pipeline according to the control output value Psc;
obtaining a water pump rotating speed command v according to the water pressure deviation value Pe in the pipeline;
and obtaining the water pump rotating speed command v to complete variable-frequency constant-pressure water supply control.
Further, the calculation formula for obtaining the control output value Psc according to the water pressure set value Ps in the pipeline is as follows:
wherein Psc is the output value of the control module, ps is the set value of the water pressure in the pipeline, pso is the initial water pressure value in the pipeline, T is the inverse proportion of the adjustable parameter and the change speed of the water pressure in the pipeline, T is the operation time after the water pressure instruction Ps is modified, and e is a natural constant.
Further, the calculation formula for obtaining the water pressure deviation value Pe in the pipeline according to the control output value Psc is as follows:
Pe＝Psc-Pc
wherein Pe is the water pressure deviation value in the pipeline, psc is the control module output value, and Pc is the pressure detection value Pc in the pipeline.
Further, the obtaining the water pump rotation speed command v according to the water pressure deviation value Pe in the pipeline includes:
obtaining an integral coefficient Ki according to the water pressure deviation value Pe in the pipeline;
and obtaining a water pump rotating speed command v according to the integral coefficient Ki and the joint proportional coefficient Kp.
Further, the obtaining the integral coefficient Ki according to the water pressure deviation value Pe in the pipeline includes:
obtaining a water pressure deviation coefficient i in the pipeline according to the water pressure deviation value Pe in the pipeline;
judging whether the water pressure deviation coefficient i in the pipeline is smaller than 0.25, if so, the integral coefficient Ki is Kib, otherwise, the integral coefficient Ki is Kis;
wherein ,pe is the water pressure deviation value in the pipeline, ps is the water pressure set value in the pipeline, kib and Kis are two parameter values of integral coefficient Ki and Kib>Kis。
Further, obtaining the water pump rotation speed command v according to the integral coefficient Ki and the proportional coefficient Kp includes:
obtaining a hydraulic pressure deviation integral term Ysm according to the integral coefficient Ki;
and obtaining a water pump rotating speed command v according to the water pressure deviation integral term Ysm and the joint proportionality coefficient Kp.
Further, the calculation formula for obtaining the hydraulic deviation integral term Ysm according to the integral coefficient Ki is as follows:
Ysm＝Pe*Ki+Ysm'
where Ysm is the hydraulic pressure deviation integral term, pe is the hydraulic pressure deviation value in the pipe, ki is the integral coefficient, and Ysm' is the hydraulic pressure deviation integral term at the previous time.
Further, a calculation formula for obtaining the water pump rotating speed command v according to the water pressure deviation integral term Ysm and the proportional coefficient Kp is as follows:
v＝Pe*Kp+Ysm
wherein v is a water pump rotating speed instruction, pe is a water pressure deviation value in a pipeline, kp is a controller proportion parameter, and Ysm is a water pressure deviation integral term.
A variable frequency constant pressure water supply control system comprising: the controller is electrically connected with the executing mechanism and comprises a set value change process control module, a pressure comparison unit and an automatic control unit;
the set value change process control module is used for obtaining a water pressure set value Ps in the pipeline and obtaining a control output value Psc according to the water pressure set value Ps in the pipeline and transmitting the control output value Psc to the pressure comparison unit;
the pressure comparison unit is used for acquiring a control output value Psc, obtaining a water pressure deviation value Pe in the pipeline according to a pipeline pressure detection value Pc, and transmitting the water pressure deviation value Pe to the automatic control unit;
the automatic control unit is used for acquiring a water pressure deviation value Pe in the pipeline, acquiring a water pump rotating speed command v according to the water pressure deviation value Pe in the pipeline, and transmitting the water pump rotating speed command v to the executing mechanism;
the actuating mechanism is used for acquiring a water pump rotating speed command v and controlling the rotating speed of the water pump according to the water pump rotating speed command v so as to realize constant pressure control of the water supply system.
The beneficial effects are that: according to the application, by adding the set value change process control module, the set value Psc of the water pressure in the pipeline does not have a great abrupt change after the set value is modified or during starting, and the stable change of the water pressure is effectively controlled. According to the application, the set value change process control module is introduced, and an expert proportional integral control algorithm is used, so that an adjustable space of a proportional integral coefficient is released, and under the working condition that the water pressure deviation is smaller, a larger proportional integral coefficient can be set to improve the water pressure adjusting speed without causing overshoot.
Drawings
FIG. 1 is a flow chart of a variable frequency constant pressure water supply control method provided by the application;
FIG. 2 is a control block diagram of a variable frequency constant pressure water supply control method provided by the application;
FIG. 3 is a flow chart of a specific implementation process of the variable frequency constant pressure water supply control method provided by the application;
fig. 4 is a block diagram of a variable frequency constant pressure water supply control system provided by the application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the application may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the application.
Example 1:
as shown in fig. 1 to 3, a variable frequency constant pressure water supply control method includes:
s1, acquiring a water pressure set value Ps in a pipeline;
s2, obtaining a control output value Psc according to a water pressure set value Ps in the pipeline;
s3, obtaining a water pressure deviation value Pe in the pipeline according to the control output value Psc;
s4, obtaining a water pump rotating speed command v according to the water pressure deviation value Pe in the pipeline;
s5, obtaining the water pump rotating speed command v to complete variable-frequency constant-pressure water supply control.
The calculation formula for obtaining the control output value Psc according to the water pressure set value Ps in the pipeline is as follows:
wherein Psc is the output value of the control module, ps is the set value of the water pressure in the pipeline, pso is the initial water pressure value in the pipeline, T is the inverse proportion of the adjustable parameter and the change speed of the water pressure in the pipeline, T is the operation time after the water pressure instruction Ps is modified, and e is a natural constant.
In this embodiment, pso represents Ps value before the pipeline pressure set value is modified, that is, old Ps value is the initial water pressure value in the pipeline, when the controller operates for the first time at time 0, ps should be initialized to Pc (0), T is an adjustable parameter, so as to control the speed of water pressure change in the pipeline, the greater T is, the more gradual the water pressure change is after the water pressure set value Ps in the pipeline changes, otherwise, the water pressure in the pipeline can reach the set water pressure rapidly. The introduction of the set value process control module can greatly improve the overshoot phenomenon, the full-speed starting (power frequency starting) process of the water pump is tested firstly during specific implementation, the water pressure in the pipeline can rise from 0 to Ps after n seconds is assumed, and when the specific implementation is carried out, as long as T >0, the operation effect of the control strategy is higher than that of the prior art, but when the T is excessively large, the water pressure rising process is stable but too slow, and the performance is ideal when T=n is comprehensively considered.
The calculation formula for obtaining the water pressure deviation value Pe in the pipeline according to the control output value Psc is as follows:
Pe＝Psc-Pc
wherein Pe is the water pressure deviation value in the pipeline, psc is the control module output value, and Pc is the pressure detection value Pc in the pipeline.
The step S4 specifically comprises the following steps:
s4-1, obtaining an integral coefficient Ki according to the water pressure deviation value Pe in the pipeline;
s4-2, obtaining a water pump rotating speed command v according to the integral coefficient Ki and the joint proportionality coefficient Kp.
The step S4-1 specifically comprises the following steps:
s4-1-1, obtaining a water pressure deviation coefficient i in the pipeline according to the water pressure deviation value Pe in the pipeline;
s4-1-2, judging whether the water pressure deviation coefficient i in the pipeline is smaller than 0.25, if so, the integral coefficient Ki is Kib, otherwise, the integral coefficient Ki is Kis;
wherein ,pe is the water pressure deviation value in the pipeline, ps is the water in the pipelinePressure set point, kib and Kis are two parameter values of integral coefficient Ki and Kib>Kis。
In this embodiment, the automatic control algorithm within the controller is improved. The common proportional-integral control algorithm is changed into an expert proportional-integral control algorithm. Because the control parameters of the common proportional-integral control algorithm are fixed, the requirements of the control parameters under different working conditions cannot be met, and the expert proportional-integral control algorithm can change the proportional-integral coefficient according to the working conditions, so that the contradiction between the water pressure regulating speed and the water pressure overshoot is solved. The flow chart of the automatic control algorithm of the patent is shown in fig. 3, a common proportional-integral control program uses an integral coefficient Ki, and an expert proportional-integral control program uses 2 integral coefficients ks and Kib, wherein ks is smaller and Kib is larger. When the water pressure deviation in the pipeline is smaller, kib is used, so that the water pressure in the pipeline can be quickly adjusted to a set value; under the working condition that the water pressure deviation in the pipeline is relatively large, kis is used, integral saturation phenomenon can be reduced, the water pressure deviation integral term Ysm is shared under two working conditions, and integral coefficients are automatically switched according to the working conditions. In practice, 0.1Kib =kes can be set, 0.1 being independent of the environment variable, but the choice of using Kib or whether ks is directly related to the environment variable Pe. Kib and ks are two values of Ki, where Ki uses Ki to become Kib as Pe becomes smaller when Pe is larger. In specific implementation, ki is a parameter variable of the controller, and is divided into 2 values: kib and ks. For example: kib =0.2, ks=0.02; if Pe/Ps <0.25, let ki=ks, otherwise ki= Kib, the prior art Ki has only one value, fixed. This patent is assigned 2 values and Ki can be switched to different values depending on the water pressure.
The step S3-2 specifically comprises the following steps:
s3-2-1, obtaining a water pressure deviation integral term Ysm according to the integral coefficient Ki;
s3-2-2, and obtaining a water pump rotating speed command v according to the water pressure deviation integral term Ysm and the proportionality coefficient Kp.
The calculation formula for obtaining the hydraulic pressure deviation integral term Ysm according to the integral coefficient Ki is as follows:
Ysm＝Pe*Ki+Ysm'
where Ysm is the hydraulic pressure deviation integral term, pe is the hydraulic pressure deviation value in the pipe, ki is the integral coefficient, and Ysm' is the hydraulic pressure deviation integral term at the previous time.
The calculation formula for obtaining the water pump rotating speed command v according to the water pressure deviation integral term Ysm and the proportional coefficient Kp is as follows:
v＝Pe*Kp+Ysm
wherein v is a water pump rotating speed instruction, pe is a water pressure deviation value in a pipeline, kp is a controller proportion parameter, and Ysm is a water pressure deviation integral term.
Example 2:
as shown in fig. 4, a variable frequency constant pressure water supply system includes: the controller is electrically connected with the executing mechanism and comprises a set value change process control module, a pressure comparison unit and an automatic control unit;
the set value change process control module is used for obtaining a water pressure set value Ps in the pipeline and obtaining a control output value Psc according to the water pressure set value Ps in the pipeline and transmitting the control output value Psc to the pressure comparison unit;
the pressure comparison unit is used for acquiring a control output value Psc, obtaining a water pressure deviation value Pe in the pipeline according to a pipeline pressure detection value Pc, and transmitting the water pressure deviation value Pe to the automatic control unit;
the automatic control unit is used for acquiring a water pressure deviation value Pe in the pipeline, acquiring a water pump rotating speed command v according to the water pressure deviation value Pe in the pipeline, and transmitting the water pump rotating speed command v to the executing mechanism;
the actuating mechanism is used for acquiring a water pump rotating speed command v and controlling the rotating speed of the water pump according to the water pump rotating speed command v so as to realize constant pressure control of the water supply system.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.
Claims (9)
1. A variable frequency constant pressure water supply control method, characterized by comprising:
acquiring a water pressure set value Ps in a pipeline;
obtaining a control output value Psc according to a water pressure set value Ps in the pipeline;
obtaining a water pressure deviation value Pe in the pipeline according to the control output value Psc;
obtaining a water pump rotating speed command v according to the water pressure deviation value Pe in the pipeline;
and obtaining the water pump rotating speed command v to complete variable-frequency constant-pressure water supply control.
2. A variable frequency constant pressure water supply control method as claimed in claim 1, wherein the calculation formula for obtaining the control output value Psc according to the water pressure set value Ps in the pipeline is as follows:
wherein Psc is the output value of the control module, ps is the set value of the water pressure in the pipeline, pso is the initial water pressure value in the pipeline, T is the inverse proportion of the adjustable parameter and the change speed of the water pressure in the pipeline, T is the operation time after the water pressure instruction Ps is modified, and e is a natural constant.
3. A variable frequency constant pressure water supply control method as claimed in claim 1, wherein the calculation formula for obtaining the water pressure deviation value Pe in the pipeline according to the control output value Psc is as follows:
Pe＝Psc-Pc
wherein Pe is the water pressure deviation value in the pipeline, psc is the control module output value, and Pc is the pressure detection value Pc in the pipeline.
4. A variable frequency constant pressure water supply control method as claimed in claim 3, wherein said obtaining a water pump rotation speed command v according to the water pressure deviation value Pe in the pipe comprises:
obtaining an integral coefficient Ki according to the water pressure deviation value Pe in the pipeline;
and obtaining a water pump rotating speed command v according to the integral coefficient Ki and the joint proportional coefficient Kp.
5. A variable frequency constant pressure water supply control method as claimed in claim 4, wherein said obtaining an integral coefficient Ki from the water pressure deviation value Pe in the pipe includes:
obtaining a water pressure deviation coefficient i in the pipeline according to the water pressure deviation value Pe in the pipeline;
judging whether the water pressure deviation coefficient i in the pipeline is smaller than 0.25, if so, the integral coefficient Ki is Kib, otherwise, the integral coefficient Ki is Kis;
wherein ,pe is the water pressure deviation value in the pipeline, ps is the water pressure set value in the pipeline, kib and Kis are two parameter values of integral coefficient Ki and Kib>Kis。
6. The method of claim 5, wherein obtaining the water pump rotation speed command v according to the integral coefficient Ki in combination with the scaling factor Kp comprises:
obtaining a hydraulic pressure deviation integral term Ysm according to the integral coefficient Ki;
and obtaining a water pump rotating speed command v according to the water pressure deviation integral term Ysm and the joint proportionality coefficient Kp.
7. The variable frequency constant pressure water supply control method as claimed in claim 6, wherein a calculation formula for obtaining the water pressure deviation integral term Ysm according to the integral coefficient Ki is as follows:
Ysm＝Pe*Ki+Ysm'
where Ysm is the hydraulic pressure deviation integral term, pe is the hydraulic pressure deviation value in the pipe, ki is the integral coefficient, and Ysm' is the hydraulic pressure deviation integral term at the previous time.
8. The method for controlling variable frequency and constant pressure water supply according to claim 6, wherein the calculation formula for obtaining the water pump rotation speed command v according to the water pressure deviation integral term Ysm and the proportionality coefficient Kp is as follows:
v＝Pe*Kp+Ysm
wherein v is a water pump rotating speed instruction, pe is a water pressure deviation value in a pipeline, kp is a controller proportion parameter, and Ysm is a water pressure deviation integral term.
9. A system based on the variable frequency constant pressure water supply control method as claimed in any one of claims 1 to 8, comprising: the controller is electrically connected with the executing mechanism and comprises a set value change process control module, a pressure comparison unit and an automatic control unit;
the set value change process control module is used for obtaining a water pressure set value Ps in the pipeline, obtaining a control output value Psc according to the water pressure set value Ps in the pipeline and transmitting the control output value Psc to the pressure comparison unit;
the pressure comparison unit is used for acquiring a control output value Psc, obtaining a water pressure deviation value Pe in the pipeline according to a pipeline pressure detection value Pc, and transmitting the water pressure deviation value Pe to the automatic control unit;
the automatic control unit is used for acquiring a water pressure deviation value Pe in the pipeline, acquiring a water pump rotating speed command v according to the water pressure deviation value Pe in the pipeline, and transmitting the water pump rotating speed command v to the executing mechanism;
the actuating mechanism is used for acquiring a water pump rotating speed command v and controlling the rotating speed of the water pump according to the water pump rotating speed command v so as to realize constant pressure control of the water supply system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117294214A (en) * | 2023-11-27 | 2023-12-26 | 河北众瑞电气科技有限公司 | Rotor variable-frequency speed regulation control method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117294214A (en) * | 2023-11-27 | 2023-12-26 | 河北众瑞电气科技有限公司 | Rotor variable-frequency speed regulation control method and device |
| CN117294214B (en) * | 2023-11-27 | 2024-02-02 | 河北众瑞电气科技有限公司 | Rotor variable-frequency speed regulation control method and device |
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