Water source regulation and control system and method based on improved PID control

Abstract

The invention relates to the technical field of water supply control, and provides a water source regulation and control system and method based on improved PID control, and the method comprises the following steps: obtaining monitoring data of a water plant, including water inlet flow and water outlet flow of a water source clean water tank; monitoring data are input into the improved PID controller, PID parameters are adjusted in a self-adaptive mode according to the obtained difference value of the water inlet flow and the water outlet flow, PID adjustment is executed according to the adjusted PID parameters, and the regulation and control amount of the water inlet amount of the emergency water source is output; and regulating and controlling the execution mechanism based on the regulation and control quantity to realize water inlet control of the water source. According to the invention, the PID parameters of the PID controller are automatically adjusted and the PID controller is improved based on the real-time difference between the inlet water and the outlet water of the clear water tank of the water plant, so that the liquid level of the clear water tank of the water plant of the emergency water source can be controlled in real time, the liquid level change can be responded more quickly and accurately, and the waste of water resources is avoided.

Description

Technical Field

[0001] The present disclosure relates to the technical field related to water supply control, and in particular, to a water source control system and method based on improved PID control. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] In modern water resource management, the stability and reliability of water sources are crucial. The water volume control of water sources is directly related to the efficient use and continuous supply capacity of water resources. In order to ensure that the dynamic changes in water demand can be responded to in a timely manner, the water inflow of water sources must be adjusted in real time and accurately. If the water inflow of water sources is not properly controlled, when the water inflow is insufficient, it cannot meet the basic water demand in emergency situations; when the water supply is excessive, it will cause water resource waste and even cause the emergency water source system or related equipment to be overloaded. Traditional control methods are difficult to respond quickly to sudden changes in water demand, delaying the efficiency of emergency response.

[0004] The inventors found that the existing water source monitoring mostly uses PID controllers, which achieve the stability of system output by adjusting the control variables and have good dynamic response performance. However, the traditional PID controller cannot provide the best control effect when facing nonlinear systems, external interference or system parameter changes. Especially in water source management, these problems may lead to inaccurate water level control, which in turn affects the stability of water supply. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes an emergency water source regulation system and method based on improved PID control, improves the PID control, realizes automatic regulation of emergency water sources through adaptive and dynamic weight control parameters, and improves the adaptability of the water source system to water supply changes and interference.

[0006] In order to achieve the above objectives, the present disclosure adopts the following technical solutions: One or more embodiments provide a water source control method based on improved PID control, comprising the following steps: Obtain monitoring data of the water plant, including the inflow and outflow of the water source clear water tank; The monitoring data is input into the improved PID controller, and the PID parameters are adaptively adjusted according to the difference between the acquired inlet flow rate and the outlet flow rate. The PID regulation is performed according to the adjusted PID parameters, and the control amount of the emergency water source inlet flow is output; The actuator is regulated based on the regulation amount to realize water inlet control of the water source.

[0007] One or more embodiments provide a water source regulation system based on improved PID control, including: Data acquisition module: used to collect monitoring data of the water plant, including the liquid level data of the water source clear water tank, water inlet flow and water outlet flow; The PID controller is used to adaptively adjust the PID parameters according to the difference between the collected inlet flow rate and the outlet flow rate, perform PID regulation according to the adjusted PID parameters, and output the control amount of the emergency water source inlet flow; The actuator includes a water inlet valve arranged at the water inlet end of the clear water tank of the water plant, and one or more water intake pumps; according to the control quantity output by the PID controller, the actuator operates to realize the water inlet control of the water source.

[0008] Compared with the prior art, the present invention has the following beneficial effects: In this embodiment, the PID parameters of the PID controller are automatically adjusted based on the real-time difference between the inlet and outlet water of the water plant's clear water tank, and the PID controller is improved. The liquid level of the water plant's clear water tank for emergency water sources can be controlled in real time, and the liquid level changes can be responded to more quickly and accurately to avoid waste of water resources. At the same time, precise liquid level control can also avoid overload operation of water plant equipment due to excessive water storage, thereby realizing the protection of water source water plants, reducing delays and errors caused by manual monitoring, and improving the automation and stability of water plant operations.

[0009] The advantages of the present disclosure and the advantages of additional aspects will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The exemplary embodiments of the present disclosure and the description thereof are used to explain the present disclosure but do not constitute a limitation of the present disclosure.

[0011] Figure 1 is a block diagram of a water source control system based on improved PID control in Example 1 of the present disclosure; Figure 2 is a schematic structural diagram of a water source control system of Embodiment 1 of the present disclosure; Figure 3 is a flow chart of the water source control method of Embodiment 2 of the present disclosure; DETAILED DESCRIPTION The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0012] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present disclosure belongs.

[0013] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof. It should be noted that, in the absence of conflict, the various embodiments in the present disclosure and the features in the embodiments can be combined with each other. The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0014] Example 1 To facilitate understanding of the solution of this embodiment, the water supply process of the water plant water source as the object of regulation is first described; like Figure 1 As shown in the figure, the water source of the water plant is mainly stored in the water plant clear water tank, which is connected to the source water clear water tank of the upper level through a water pipeline, and the quantity of the water plant clear water tank is controlled by controlling the water inlet at the water inlet end; the water plant clear water tank is used to store water and provide reserves for subsequent water supply treatment. The stability of the water level control of the clear water tank can effectively ensure the continuity and reliability of the water supply system.

[0015] The source water clear water tank is the main water supply unit of the water plant clear water tank. It can be used to store source water from natural water sources (such as groundwater or surface water) or other emergency water supply systems, or it can be a clear water tank of another water plant. After preliminary treatment, the source water of the source water clear water tank is transported to the water plant clear water tank through a water pipeline.

[0016] The following provides a liquid level control system for a water plant clear water tank to achieve effective monitoring of the water plant's water source, which can not only ensure sufficient water supply to subsequent water users, but also regulate the operating load of the water plant equipment.

[0017] In the technical solutions disclosed in one or more embodiments, Figure 2 As shown, a water source control system based on improved PID control can be used to realize remote monitoring and realize adaptive control of the liquid level of the water plant clear water tank of the water plant, including: Data acquisition module: used to collect monitoring data of the water plant, including at least the liquid level data of the water source clear water tank, water inlet flow and water outlet flow; The PID controller is used to adaptively adjust the PID parameters according to the difference between the collected inlet flow rate and the outlet flow rate, perform PID regulation according to the adjusted PID parameters, and output the control amount of the emergency water source inlet flow; The actuator includes a water inlet valve arranged at the water inlet end of the water plant's clear water tank, and one or more water intake pumps; according to the control quantity output by the PID controller, the actuator operates to realize the water inlet control of the water source; In this embodiment, the PID parameters of the PID controller are automatically adjusted based on the real-time difference between the inlet and outlet water of the water plant's clear water tank, and the PID controller is improved. The liquid level of the water plant's clear water tank for emergency water sources can be controlled in real time, and the liquid level changes can be responded to more quickly and accurately to avoid waste of water resources. At the same time, precise liquid level control can also avoid overload operation of water plant equipment due to excessive water storage, thereby realizing the protection of water source water plants, reducing delays and errors caused by manual monitoring, and improving the automation and stability of water plant operations.

[0018] In some embodiments, the data acquisition module is connected to a sensor module, which may include: a liquid level sensor, a flow meter, a temperature sensor, etc., for real-time monitoring of equipment or environmental parameters; The data acquisition module is used to receive, process and store the data collected by the sensor module and upload it to the PID controller; A further technical solution is to set up a water source pump station at the water inlet of the water plant. A thermostat, fan and dehumidifier can also be installed in the water source pump station to avoid equipment failure due to overheating or humidity. A thermostat is installed in the pump room to detect the temperature of the distribution cabinet, and the fan is started to cool it down when the temperature is too high.

[0019] Among them, the condensed water of the dehumidifier is connected to a long hose and discharged to the outside of the water source pump station, which improves the stability and reliability of the overall system.

[0020] The PID controller is configured to adaptively adjust the PID parameters according to the difference between the collected water inlet flow rate and the water outlet flow rate, perform PID regulation according to the adjusted PID parameters, and output the control amount of the emergency water source water inlet flow rate; This embodiment improves the PID controller and uses an adaptive method to adjust the PID parameters. Compared with the traditional fixed adjustment of PID parameters, it can improve the accuracy of the water level inlet regulation of the water plant clear water tank and can regulate the water inlet in real time according to the water output. A reference model is designed for the water plant clear water tank. The water inflow of the water plant clear water tank is taken as the controlled object. The initial parameters are preliminarily adjusted using the Ziegler-Nichols method. The PID parameters are adaptively controlled based on the real-time inflow and outflow of the water plant clear water tank using dynamic weight adjustment. The details are as follows:

[0021] in, Indicates the water inlet flow rate of the clear water tank of the water plant to be controlled, Indicates the outflow rate of the clear water tank of the water plant to be controlled, Indicates the difference; represents the output value of the PID controller at time k; Based on the difference between the inlet flow rate and the outlet flow rate, the dynamic weight is obtained. ,as follows:

[0022] in, yes k The weight of the moment, is the coefficient set for Indicates the difference; The weight coefficient of this embodiment It is determined based on the difference between the water supply inlet and outlet flow rates of the water plant. The smaller the difference between the water supply and outlet flow rates, the fewer intervals the system needs to adjust; and vice versa. Based on the dynamic weight obtained , adjust the parameters to adjust the PID parameters, the formula is:

[0023] in, , , are the initial PID parameters, , , It is the PID parameter adjusted according to the dynamic weight.

[0024] In this embodiment, by improving the PID controller and using dynamic weight adaptive adjustment of the PID control parameters of the controller, the system's adaptability to water supply changes and interference can be maximized. In addition, combined with the real-time data collected by the data acquisition device, more accurate water source control and emergency response can be achieved.

[0025] In the above technical solution, the liquid level of the water plant clear water tank of the controlled water source is accurately controlled based on the improved PID control logic according to the water inlet flow rate and the water outlet flow rate; further, when the water plant clear water tank is lower than the set warning liquid level, the emergency control mode is entered, and the priority of the emergency control mode is higher than the automatic adjustment mode of the above PID controller. Specifically: Set the warning liquid level of the water plant's clear water tank. When it is lower than the warning liquid level, control the water inlet valve at the water plant's clear water tank inlet end to fully open, and turn on the water inlet pump on the water inlet pipeline; Specifically, in the present embodiment, two warning liquid levels are set, which are 1.2m and 1.1m respectively; when it is detected that the clear water tank of the water plant is lower than the fire liquid level of 1.2m, the electromagnetic valve on the water inlet pipe of the clear water tank of the water plant is opened, and when the opening reaches 100%, the No. 1 water pump is turned on, and when the liquid level drops to 1.1m, the No. 2 water pump is turned on. At this time, the two water pumps work at the same time, and the water supply flow reaches its peak. If the liquid level continues to drop, the system starts a buzzer alarm and sends an alarm text message to the emergency response personnel remotely.

[0026] Furthermore, the water source control system based on the improved PID control also includes: an automatic alarm module, which is configured to automatically trigger an alarm and sound an alarm when the liquid level of the source water clear water tank and the water plant clear water tank is abnormal; wherein the liquid level abnormality includes the water level being too low or too high; The emergency response mode of this embodiment can automatically adjust the water source control strategy according to the alarm information to ensure the stability of the water source.

[0027] A further technical solution also includes a remote control terminal, which is respectively communicated with the data acquisition module, the PID controller and the actuator; the remote control terminal is provided with a human-computer interaction control interface, which can be used to display the relevant collected data of the water source, the relevant voltage, current and frequency signals of the equipment of each actuator and the operating status of the equipment in real time.

[0028] Furthermore, the remote control terminal can be set in two modes: automatic and manual. You can set it through the control interface of the remote control terminal: In automatic mode, PID control automatic control mode or emergency control mode when the liquid level is lower than the threshold is adopted; In manual mode, when a planned water outage or other water use problems occur, the water inlet control valve, water outlet control valve and other actuators can be manually controlled to control the corresponding pumps to store water in the water plant's clear water tank; in this embodiment, pump No. 1 and / or control valve pump No. 2 is started to store water in the water plant's clear water tank.

[0029] Compared with the existing emergency water source equipment, the system of this embodiment can control the liquid level of the water plant's clear water tank in real time, adjust the water volume of the emergency water source by using the difference between the water inlet and outlet of the water plant, respond to liquid level changes more quickly and accurately, avoid waste of water resources, and protect water sources and water plants, thereby reducing delays and errors caused by manual monitoring and improving the automation and stability of water plant operations.

[0030] Example 2 Based on Example 1, this embodiment provides a water source control method based on improved PID control, including using a PID controller to execute an automatic control mode and an emergency control mode, such as Figure 3 As shown, the automatic control mode includes the following steps: Step 1: Obtain monitoring data of the water plant, including the inflow and outflow of the water source clear water tank; Step 2: Input the monitoring data into the improved PID controller, adaptively adjust the PID parameters according to the difference between the acquired inlet flow rate and the outlet flow rate, perform PID regulation according to the adjusted PID parameters, and output the control amount of the emergency water source inlet flow; Step 3: regulating the actuator based on the regulation amount to achieve water inlet control of the water source; The PID parameters of the improved PID controller in this embodiment can change in real time. The PID parameters can be adjusted according to the difference between the inlet and outlet water, which can respond to liquid level changes more quickly and accurately, avoid waste of water resources, and ensure that the water plant equipment operates under appropriate load, thereby protecting the water source water plant.

[0031] Based on the real-time inlet and outlet flow of the water plant clear water tank, the dynamic weight adjustment is used to adaptively control the PID parameters, as follows:

[0032] in, Indicates the water inlet flow rate of the clear water tank of the water plant to be controlled, Indicates the outflow rate of the clear water tank of the water plant to be controlled, Indicates the difference; represents the output value of the PID controller at time k; Based on the difference between the inlet flow rate and the outlet flow rate, the dynamic weight is obtained. Specifically, the square of the difference between the current inlet flow rate and the outlet flow rate Multiply by the set coefficient , the product is added with 1 and the inverse is taken as the dynamic weight ,as follows:

[0033] yes k The weight of the moment, is the coefficient set for Indicates the difference between the inlet flow rate and the outlet flow rate; The weight coefficient of this embodiment It is determined based on the difference between the water supply inlet and outlet flow rates of the water plant. The smaller the difference between the water supply and outlet flow rates, the fewer intervals the system needs to adjust; and vice versa. Based on the dynamic weight obtained , adjust the parameters to adjust the PID parameters, the formula is:

[0034] in, , , are the initial PID parameters, , , It is the PID parameter adjusted according to the dynamic weight.

[0035] In this embodiment, by improving the PID controller and using dynamic weight adaptive adjustment of the PID control parameters of the controller, the system's adaptability to water supply changes and interference can be maximized. In addition, combined with the real-time data collected by the data acquisition device, more accurate water source control and emergency response can be achieved.

[0036] Furthermore, it also includes obtaining the liquid level data of the water source clear water tank, and when the liquid level is not lower than the set warning liquid level, automatically adjusting the liquid level of the water plant clear water tank of the controlled water source based on the improved PID controller; when the liquid level is lower than the set warning liquid level, executing the emergency control mode; Emergency control mode, specifically: set the warning liquid level of the water plant's clear water tank. When it is lower than the warning liquid level, control the water inlet valve at the water plant's clear water tank inlet end to fully open, and turn on the water inlet pump on the water inlet pipeline; Specifically, in the present embodiment, two warning liquid levels are set, which are 1.2m and 1.1m respectively; when it is detected that the clear water tank of the water plant is lower than the fire liquid level of 1.2m, the electromagnetic valve on the water inlet pipe of the clear water tank of the water plant is opened, and when the opening reaches 100%, the No. 1 water pump is turned on, and when the liquid level drops to 1.1m, the No. 2 water pump is turned on. At this time, the two water pumps work at the same time, and the water supply flow reaches its peak. If the liquid level continues to drop, the system starts a buzzer alarm and sends an alarm text message to the emergency response personnel remotely.

[0037] Furthermore, the method further includes the step of executing an automatic alarm. When the liquid level of the source water clear water tank or the water plant clear water tank is detected to be abnormal, an alarm is automatically triggered and an alarm message is issued; wherein the abnormal liquid level includes a water level that is too low or too high; Further technical solutions include automatic and manual modes, which can be set through the control interface of the remote control terminal: In automatic mode, PID control automatic control mode or emergency control mode when the liquid level is lower than the threshold is adopted; In manual mode, when a planned water outage or other water use problems occur, the manual control of actuators such as the water inlet control valve and the water outlet control valve can be started manually to control the operation of the corresponding pumps and store water in the water plant's clear water tank.

[0038] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

[0039] Although the above describes the specific implementation methods of the present disclosure in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present disclosure. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present disclosure, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present disclosure.

Claims

1. A water source control method based on improved PID control, characterized in that: The steps include: Obtain monitoring data of the water plant, including the inflow and outflow of the water source clear water tank; The monitoring data is input into the improved PID controller, and the PID parameters are adaptively adjusted according to the difference between the inlet flow rate and the outlet flow rate. The PID regulation is performed according to the adjusted PID parameters, and the control amount of the emergency water source inlet flow is output; The actuator is regulated based on the regulation amount to realize water inlet control of the water source.

2. The water source control method based on improved PID control according to claim 1, characterized in that: Based on the difference between the inlet flow and the outlet flow, the dynamic weight is obtained. Specifically, the square of the difference between the current inlet flow and the outlet flow of the water source clear water tank is multiplied by the set coefficient, and the product is added by 1 and the reciprocal is taken as the dynamic weight. .

3. The water source control method based on improved PID control according to claim 2, characterized in that: Multiply the initial PID parameters by the obtained dynamic weights , and obtain the PID parameters adjusted according to the dynamic weights.

4. The water source control method based on improved PID control according to claim 1, characterized in that: It also includes obtaining the liquid level data of the water source clear water tank. When the liquid level is not lower than the set warning level, the liquid level of the water plant clear water tank of the controlled water source is automatically adjusted based on the improved PID controller; when the liquid level is lower than the set warning level, the emergency control mode is executed.

5. The water source control method based on improved PID control according to claim 4, characterized in that: Emergency control mode, specifically: set the warning liquid level of the water plant's clear water tank. When it is lower than the warning liquid level, control the water inlet valve at the water plant's clear water tank inlet end to fully open, and turn on the water inlet pump on the inlet pipe.

6. The water source control method based on improved PID control according to claim 4, characterized in that: When the liquid level in the source water clear water tank or the water plant clear water tank is detected to be abnormal, an alarm is automatically triggered and an alarm message is issued.

7. The water source control system based on improved PID control is characterized by: include: Data acquisition module: used to collect monitoring data of the water plant, including the liquid level data of the water source clear water tank, water inlet flow and water outlet flow; The PID controller is used to adaptively adjust the PID parameters according to the difference between the collected inlet flow rate and the outlet flow rate, perform PID regulation according to the adjusted PID parameters, and output the control amount of the emergency water source inlet flow; The actuator includes a water inlet valve arranged at the water inlet end of the clear water tank of the water plant, and one or more water intake pumps; according to the control quantity output by the PID controller, the actuator operates to realize the water inlet control of the water source.

8. The water source control system based on improved PID control according to claim 7, characterized in that: Based on the difference between the inlet flow and the outlet flow, the dynamic weight is obtained. Specifically, the square of the difference between the current inlet flow and the outlet flow of the water source clear water tank is multiplied by the set coefficient, and the product is added by 1 and the reciprocal is taken as the dynamic weight. .

9. The water source control system based on improved PID control as claimed in claim 8, characterized in that: Multiply the initial PID parameters by the obtained dynamic weights , and obtain the PID parameters adjusted according to the dynamic weights.

10. The water source control system based on improved PID control according to claim 8, characterized in that: A remote control terminal is also provided, which is respectively connected to the data acquisition module, the PID controller and the actuator in communication; the remote control terminal is provided with a human-computer interaction control interface; Alternatively, the remote control terminal can be set to automatic or manual mode: In automatic mode, the automatic control mode of the improved PID controller or the emergency control mode when the liquid level is lower than the warning level is adopted; In manual mode, the water inlet valve and the water outlet valve are manually controlled to control the corresponding pumps to store water in the water plant's clear water tank.

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