A water pressure intelligent control system based on pressure zone control

Abstract

The present invention discloses a water pressure intelligent control system based on pressure zone control, which relates to the technical field of water pressure control. The pressure zone acquisition module is used to divide the entire water supply area into several different pressure zones, and the water supply pipelines in the pressure zones are equipped with water pumps, pressure sensors, flow sensors and valves, and the actual value of the current water pressure in the water supply pipeline is collected by the pressure sensor and sent to the strategy control module; the strategy control module, according to the actual value fed back by the pressure zone acquisition module, the PID controller performs intelligent control on the water pressure of each pressure zone. The present invention can automatically adjust the parameters of the PID controller according to the real-time operating status of the pressure zone water supply pipeline, realize the linkage between the output power of the water pump and the valve opening, effectively maintain the water pressure stability, and achieve high control accuracy by estimating the parameters of the system online, and realize optimal control. At the same time, the damage of the pressure zone water supply pipeline can be monitored and located in real time, and has broad application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of water pressure regulation, and in particular to an intelligent water pressure regulation system based on pressure zoning control. Background Art

[0002] With the continuous development of science and technology, precise control of water pressure has become crucial in many fields. In industrial production, different process flows have specific requirements for water pressure. Stable and precise water pressure can ensure the efficiency of the production process and the stability of product quality. For example, in the field of precision manufacturing, some processing processes require constant water pressure to ensure processing accuracy. In urban water supply systems, reasonable water pressure control can meet the water needs of users at different heights, while avoiding pipe rupture and energy waste caused by excessive water pressure. In the field of construction, fire protection systems, water supply and drainage systems, etc. also have strict requirements for water pressure. The fire protection system needs to quickly provide sufficient water pressure when a fire occurs to ensure the fire extinguishing effect, while the water supply and drainage system needs to adjust the water pressure according to different usage scenarios to achieve water saving and improve water comfort. In addition, with the continuous advancement of intelligent technology, people have higher and higher requirements for the automation and intelligence of water pressure control. Through the collaborative work of sensors, controllers and actuators, real-time monitoring and precise regulation of water pressure can be achieved to improve the reliability and stability of the system.

[0003] However, the existing intelligent control algorithms may not be able to adapt to complex actual situations. In water pressure control systems, it is usually necessary to keep the water pressure within a specific range to meet different application requirements. The existing intelligent control algorithms can achieve water pressure control to a certain extent, but due to the dynamic characteristics and uncertainty of the system, for example, during peak and trough periods of water use, the control effect of the system may be greatly reduced. At the same time, the algorithm is not adaptable enough and cannot be adjusted in time according to the actual operation of the system. It is difficult to meet high-performance control requirements, and in abnormal situations such as pipeline damage, feedback cannot be given in time, resulting in the system's performance not being fully utilized.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0005] In view of the problems in the related art, the present invention proposes a water pressure intelligent control system based on pressure zone control to overcome the above-mentioned technical problems existing in the existing related art.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A water pressure intelligent control system based on pressure zone control, comprising: a pressure zone acquisition module and a strategy control module, wherein;

[0008] The pressure zone acquisition module is used to divide the entire water supply area into several different pressure zones, and configure water pumps, pressure sensors, flow sensors and valves in the water supply pipelines within the pressure zones, and collect the actual value of the current water pressure in the water supply pipeline through the pressure sensor and send it to the strategy control module, wherein the water pump is used to control the output power of the current water supply pipeline, the flow sensor is used to collect the current flow value of the water supply pipeline, and the valve is used to control the valve opening of the current water supply pipeline;

[0009] The strategy control module, according to the actual value fed back by the pressure zone acquisition module, uses a PID controller to intelligently control the water pressure of each pressure zone, including: the PID controller compares the deviation between the actual value and the set value of the water pressure with the risk value, and if the deviation does not meet the risk value, calculates the adjustment amount of the water pump output power and the valve opening, and controls the water pump output power and the valve opening in a linked manner according to the adjustment amount, so that the deviation between the actual value and the set value of the water pressure meets the risk value, and within the adjustment period, if the deviation between the actual value and the set value of the water pressure does not meet the risk value, it indicates that there is a pipe damage in the water supply pipe in the current pressure zone, and determines the damage location according to the change in the flow value, wherein;

[0010] The calculation of the adjustment amount of the water pump output power and the valve opening includes: estimating the model parameters of the system in real time according to the parameter estimation method, and adjusting the proportional coefficient, integral coefficient and differential coefficient of the PID controller according to the estimated parameters to adjust the parameters of the PID controller as the adjustment amount of the water pump output power and the valve opening to achieve adaptive optimal control.

[0011] Furthermore, it also includes: a safety monitoring module, which is used to set the pressure limit value of the water supply pipeline within the pressure zone, and when the actual value of the water pressure in the current water supply pipeline exceeds the pressure limit value, execute a preset emergency strategy.

[0012] Furthermore, the preset emergency strategy includes: stopping the operation of the water pump or controlling the maximum value of the valve opening.

[0013] Furthermore, the calculation of the adjustment amount of the water pump output power and the valve opening comprises the following steps:

[0014] The mathematical model of the calibration water pressure intelligent control system is expressed as: ;

[0015] in, The system is at time k The output water pressure, The system is at time k The input control signal, is the noise of the system, and is the transfer function of the system,

[0016] The output of the calibrated PID controller is expressed as: ;

[0017] in, is the control signal, is the error signal, expressed as the deviation between the actual value and the set value, , and They are the proportional coefficient, integral coefficient and differential coefficient respectively.

[0018] Furthermore, the method of controlling the pump output power and the valve opening in linkage according to the adjustment amount so that the deviation between the actual value of the water pressure and the set value meets the risk value includes the following steps:

[0019] When the actual water pressure is lower than the set value, gradually increase the output power of the water pump to increase the water supply pressure, and adaptively reduce the valve opening to reduce the water flow;

[0020] When the actual water pressure is higher than the set value, the output power of the water pump is reduced, the water supply pressure is reduced, and the valve opening is adaptively increased to increase the water flow.

[0021] Furthermore, if there is a pipe damage in the water supply pipe in the current pressure zone, the following steps are included:

[0022] During the adjustment period, the deviation between the actual value of the water pressure and the set value gradually decreases with the adjustment amount until it meets the risk value, where;

[0023] If the deviation between the actual value of the water pressure and the set value during the adjustment period changes abnormally with the adjustment amount and does not meet the risk value, it indicates that there is a pipe damage in the current water supply pipeline;

[0024] The damage range is obtained according to the change in the flow value of the current water supply pipeline.

[0025] Beneficial effects of the present invention:

[0026] The present invention can automatically adjust the parameters of the PID controller according to the real-time operating status of the pressure-zoned water supply pipeline, realize the linkage between the output power of the water pump and the valve opening, effectively maintain the water pressure stability, and have high control accuracy. By estimating the parameters of the system online, optimal control is achieved, and the accuracy of water pressure control is improved. At the same time, the damage of the pressure-zoned water supply pipeline can be monitored and located in real time to ensure the safe and reliable operation of the water supply system to adapt to different working conditions. In addition, it has good robustness and has good robustness to the uncertainty and interference of the intelligent control system, which can ensure the stability and reliability of the system and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the principle of a water pressure intelligent regulation system based on pressure zone control according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0030] According to an embodiment of the present invention, a water pressure intelligent regulation system based on pressure zone control is provided.

[0031] like Figure 1 As shown, the water pressure intelligent control system based on pressure zone control according to an embodiment of the present invention includes a pressure zone acquisition module 1 and a strategy control module 2, wherein;

[0032] The pressure zone acquisition module 1 is used to divide the entire water supply area into several different pressure zones, and configure water pumps, pressure sensors, flow sensors and valves in the water supply pipelines within the pressure zones, and collect the actual value of the current water pressure in the water supply pipeline through the pressure sensor and send it to the strategy control module 2, wherein the water pump is used to control the output power of the current water supply pipeline, the flow sensor is used to collect the current flow value of the water supply pipeline, and the valve is used to control the valve opening of the current water supply pipeline;

[0033] When the technical solution is applied, each partition sets a specific pressure range as the pressure limit value according to its actual needs and characteristics, and the middle value of its pressure limit value is used as the set value. At the same time, the range of values ​​within any interval between its set value and the maximum or minimum value of the pressure limit value is used as the risk value. For example, a high-rise area may require a higher pressure, while a low-rise area may require a lower pressure.

[0034] The strategy control module 2, according to the actual value fed back by the pressure zone acquisition module 1, the PID controller performs intelligent control on the water pressure of each pressure zone, including: the PID controller compares the deviation between the actual value and the set value of the water pressure with the risk value, if the deviation does not meet the risk value, then calculates the adjustment amount of the water pump output power and the valve opening, and controls the water pump output power and the valve opening in a linked manner according to the adjustment amount, so that the deviation between the actual value and the set value of the water pressure meets the risk value, and within the adjustment period, if the deviation between the actual value and the set value of the water pressure does not meet the risk value, it indicates that there is a pipe damage in the water supply pipe in the current pressure zone, and determines the damage location according to the change in the flow value, wherein;

[0035] The adjustment amount of the water pump output power and the valve opening is calculated, including: according to the parameter estimation method, the model parameters of the system are estimated in real time, and the proportional coefficient, integral coefficient and differential coefficient of the PID controller are adjusted according to the estimated parameters to adjust the parameters of the PID controller as the adjustment amount of the water pump output power and the valve opening to achieve adaptive optimal control.

[0036] Among them, for the above PID controller, its proportional term is quickly adjusted according to the size of the deviation, the integral term is used to eliminate static errors, and the differential term predicts the change trend of water pressure and makes advance adjustments;

[0037] In the application of this technical solution, when the deviation between the actual value of water pressure and the set value suddenly increases, the PID controller will quickly increase the adjustment amount to restore the water pressure as soon as possible. As the deviation gradually approaches the risk value, the PID controller will gradually reduce the adjustment amount to avoid over-adjustment.

[0038] Specifically, when the actual water pressure is lower than the set value:

[0039] Gradually increase the output power of the water pump to increase the water supply pressure. The output power of the water pump can be increased by adjusting the motor speed, increasing the impeller speed, etc. For example, the frequency conversion speed regulation technology is used to automatically adjust the motor frequency according to the change of water pressure, thereby changing the speed of the water pump. At the same time, the valve opening is adaptively reduced to reduce the water flow to avoid further drop in water pressure due to excessive flow.

[0040] Among them, when the actual value of water pressure is higher than the set value:

[0041] Reduce the output power of the water pump and reduce the water supply pressure. You can reduce the motor speed or the impeller speed to reduce the output power of the water pump. At the same time, appropriately increase the valve opening and increase the water flow to reduce the water pressure in the system. This will allow excess water to flow out smoothly and avoid excessive water pressure.

[0042] In this technical solution, for the above-mentioned calculated adjustment amount of the water pump output power and the valve opening, in the actual operation process, the water pressure of the system may be affected by many factors, such as changes in water consumption, changes in pipeline resistance, etc. Therefore, it is necessary to continuously and dynamically adjust the water pump output power and the valve opening to adapt to these changes.

[0043] Specifically, the following steps are included:

[0044] According to the parameter estimation method, the model parameters of the system are estimated in real time, and the proportional, integral and differential coefficients of the PID controller are adjusted according to the estimated parameters to adjust the parameters of the PID controller as the adjustment amount of the water pump output power and valve opening to achieve adaptive optimal control;

[0045] The mathematical model of the calibration water pressure intelligent control system is expressed as: ;

[0046] in, The system is at time k The output water pressure, The system is at time k The input control signal, is the noise of the system, and is the transfer function of the system,

[0047] By estimating the system parameters online, we can obtain the estimated model of the system: ;

[0048] in, The system is at time k The output water pressure, The system is at time k The input control signal, is the noise of the system, and is the transfer function of the system,

[0049] By estimating the system parameters online, we can obtain the estimated model of the system: ;

[0050] in, is the estimated output of the system, and is the estimated transfer function of the system;

[0051] The output of the calibrated PID controller is expressed as: ;

[0052] in, is the control signal, is the error signal, expressed as the deviation between the actual value and the set value, , and They are the proportional coefficient, integral coefficient and differential coefficient respectively.

[0053] With the aid of the above scheme, the parameters of the PID controller are adjusted according to the real-time operating data of the system, which estimates the model parameters of the system online and then adjusts the parameters of the PID controller according to the estimated parameters to achieve optimal control.

[0054] Specifically, when applying, monitor the changes in water consumption in real time: when water consumption increases, water pressure will drop, and it is necessary to increase the output power of the water pump and appropriately reduce the valve opening; when water consumption decreases, water pressure will rise, and it is necessary to reduce the output power of the water pump and appropriately increase the valve opening. In addition, consider the changes in pipeline resistance: as the use time of the pipeline increases, scaling and corrosion may occur on the inner wall of the pipeline, resulting in increased pipeline resistance. At this time, it is necessary to appropriately increase the output power of the water pump to maintain stable water pressure.

[0055] In addition, the technical solution, if there is a pipe damage in the water supply pipe in the current pressure zone, includes the following steps:

[0056] During the adjustment period, the deviation between the actual value of the water pressure and the set value gradually decreases with the adjustment amount until it meets the risk value, where;

[0057] If the deviation between the actual value of the water pressure and the set value during the adjustment period changes abnormally with the adjustment amount and does not meet the risk value, it indicates that there is a pipe damage in the current water supply pipeline;

[0058] The damage range is obtained according to the change in the flow value of the current water supply pipeline.

[0059] In this technical solution, the normal water pressure drop is usually slow and regular. For example, with the arrival of the peak water consumption, the water consumption gradually increases and the water pressure will slowly drop. The PID controller can determine the water pressure change data through the historical water consumption mode as the pressure limit value for setting a specific pressure range. If the rate of water pressure drop is within the pressure limit value, then it may be a normal water pressure drop. Moreover, the water pressure drop caused by pipe damage is often sudden and drastic. The PID controller will detect that the water pressure has dropped significantly in a short period of time. This change trend is significantly different from the slow change under normal water use conditions.

[0060] In addition, under normal operation, the PID controller will continuously adjust the output so that the deviation between the actual value of the water pressure and the set value meets the risk value. When a normal water pressure drop occurs, the PID controller will try to increase the output such as increasing the pump speed or adjusting the valve opening to maintain the water pressure. At this time, the deviation is within a certain range and meets the risk value, and gradually decreases with the adjustment of the PID controller.

[0061] When the pipe is damaged, although the PID controller tries to adjust the output, the deviation between the actual value of the water pressure and the set value cannot be restored to the risk-compliant value. Moreover, the deviation between the actual value of the water pressure and the set value will continue to be large and may even continue to increase.

[0062] In addition, for the above-mentioned acquisition of the damage range based on the flow value change of the current water supply pipeline, pipeline damage usually leads to an increase in flow because water will leak out from the damaged part. The PID controller monitors the flow change in the water supply pipeline based on the flow value. If the flow rate increases significantly while the water pressure decreases, the area where the flow rate increases significantly is the damage range of the pipeline.

[0063] In addition, it also includes: a safety monitoring module 3, which is used to set the pressure limit value of the water supply pipeline in the pressure zone, and when the actual value of the water pressure in the current water supply pipeline exceeds the pressure limit value, execute a preset emergency strategy.

[0064] Specifically, the preset emergency strategies include: stopping the water pump operation or controlling the maximum value of the valve opening.

[0065] In this technical solution, for the above-mentioned pressure limit value, it is expressed as the maximum water pressure limit and the minimum water pressure limit, and if the actual value of the current water pressure in the water supply pipeline exceeds the pressure limit value, the preset emergency strategy is executed, specifically: stop the water pump operation or fully open the valve to prevent system failure.

[0066] In addition, the safety monitoring module 3 also includes: mobile terminal monitoring, which is used for operators to remotely monitor the status of the water supply pipeline in the pressure zone in real time and to send and receive instructions remotely.

[0067] In addition, for the above-mentioned safety monitoring module 3, when it is used, maintenance services can be performed regularly, for example: overload protection and overheating protection maintenance of the water pump to prevent the motor from being damaged due to excessive load or overheating. And the operating status of the valve is regularly checked to ensure that the valve can be opened and closed normally. If a valve failure is found, it is repaired or replaced in time.

[0068] At the same time, corresponding report logs are generated for the above maintenance services for operators or managers to review and analyze.

[0069] In summary, with the help of the above technical solution of the present invention, the following effects can be achieved:

[0070] The present invention can automatically adjust the parameters of the PID controller according to the real-time operating status of the pressure-zoned water supply pipeline, realize the linkage between the output power of the water pump and the valve opening, effectively maintain the water pressure stability, and have high control accuracy. By estimating the parameters of the system online, optimal control is achieved, and the accuracy of water pressure control is improved. At the same time, the damage of the pressure-zoned water supply pipeline can be monitored and located in real time to ensure the safe and reliable operation of the water supply system to adapt to different working conditions. In addition, it has good robustness and has good robustness to the uncertainty and interference of the intelligent control system, which can ensure the stability and reliability of the system and has broad application prospects.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. After considering the disclosure of the specification and the examples, those skilled in the art will easily think of other embodiments of the present disclosure. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and the examples are only regarded as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

[0072] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A water pressure intelligent control system based on pressure zone control, characterized in that: include: A pressure zone acquisition module (1) and a strategy control module (2), wherein; The pressure zone acquisition module (1) is used to divide the entire water supply area into a plurality of different pressure zones, and configure a water pump, a pressure sensor, a flow sensor and a valve in the water supply pipeline within the pressure zone, and collect the actual value of the current water pressure in the water supply pipeline through the pressure sensor and send it to the strategy control module (2), wherein the water pump is used to control the output power of the current water supply pipeline, the flow sensor is used to collect the flow value of the current water supply pipeline, and the valve is used to control the valve opening of the current water supply pipeline; The strategy control module (2) uses a PID controller to intelligently control the water pressure of each pressure zone according to the actual value fed back by the pressure zone acquisition module (1), including: the PID controller compares the deviation between the actual value of the water pressure and the set value with the risk value, and if the deviation does not meet the risk value, calculates the adjustment amount of the water pump output power and the valve opening, and controls the water pump output power and the valve opening in a linked manner according to the adjustment amount, so that the deviation between the actual value of the water pressure and the set value meets the risk value, and within the adjustment period, if the deviation between the actual value of the water pressure and the set value does not meet the risk value, it indicates that there is a pipe damage in the water supply pipe in the current pressure zone, and determines the damage location according to the change in the flow value, wherein; The calculation of the adjustment amount of the water pump output power and the valve opening comprises: estimating the model parameters of the system in real time according to the parameter estimation method, and adjusting the proportional coefficient, integral coefficient and differential coefficient of the PID controller according to the estimated parameters to adjust the parameters of the PID controller as the adjustment amount of the water pump output power and the valve opening to achieve adaptive optimal control; The step of calculating the adjustment amount of the water pump output power and the valve opening comprises the following steps: The mathematical model of the calibration water pressure intelligent control system is expressed as: ; in, The system is at time k The output water pressure, The system is at time k The input control signal, is the noise of the system, and is the transfer function of the system, By estimating the system parameters online, we can obtain the estimated model of the system: ;in, is the estimated output of the system, and is the estimated transfer function of the system; The output of the calibrated PID controller is expressed as: ;in, is the control signal, is the error signal, expressed as the deviation between the actual value and the set value, They are proportional coefficient, integral coefficient and differential coefficient respectively; The method of controlling the pump output power and the valve opening in linkage according to the adjustment amount so that the deviation between the actual value of the water pressure and the set value meets the risk value includes the following steps: When the actual water pressure is lower than the set value, gradually increase the output power of the water pump to increase the water supply pressure, and adaptively reduce the valve opening to reduce the water flow; When the actual water pressure is higher than the set value, the output power of the water pump is reduced, the water supply pressure is reduced, and the valve opening is adaptively increased to increase the water flow.

2. The water pressure intelligent control system based on pressure zone control according to claim 1 is characterized in that: Also includes: The safety monitoring module (3) is used to set a pressure limit value for the water supply pipeline within the pressure zone, and to execute a preset emergency strategy when the actual value of the water pressure in the current water supply pipeline exceeds the pressure limit value.

3. The water pressure intelligent control system based on pressure zone control according to claim 2 is characterized in that: The preset emergency strategy includes: stopping the operation of the water pump or controlling the maximum value of the valve opening.

4. The water pressure intelligent control system based on pressure zone control according to claim 3 is characterized in that: The water supply pipeline in the current pressure zone is damaged, comprising the following steps: During the adjustment period, the deviation between the actual value of the water pressure and the set value gradually decreases with the adjustment amount until it meets the risk value, where; If the deviation between the actual value of the water pressure and the set value during the adjustment period changes abnormally with the adjustment amount and does not meet the risk value, it indicates that there is a pipe damage in the current water supply pipeline; The damage range is obtained according to the change in the flow value of the current water supply pipeline.

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