Water supply network pressure reducing valve optimization setting method based on global pressure regulation and control

Abstract

The invention discloses a global pressure regulation-based water supply network pressure reducing valve optimization setting method, which comprises the following steps of: obtaining basic information of a water supply network in a region so as to construct a corresponding water supply network topological structure; constructing a pipe network offline hydraulic model; calculating a corresponding downstream maximum pressure drop space; calculating a corresponding downstream water ratio based on the downstream maximum pressure drop space; designing corresponding evaluation indexes according to a preset arrangement number in the pressure reducing valve arrangement scheme, traversing all pipelines in the water supply pipe network based on the evaluation indexes, selecting the maximum pipeline in the evaluation indexes to install the pressure reducing valve, removing the installed pipelines, and repeatedly traversing the remaining pipelines in the water supply pipe network until the preset arrangement number is met; and performing real-time global pressure regulation and control on the water supply pipe network based on the completely mounted pressure reducing valve. The invention provides the method. According to the method, it can be ensured that the pressure in the pipe network fluctuates within a reasonable range, and the background leakage rate and the pipe explosion probability are reduced to the maximum extent.

Description

Technical Field

[0001] The present invention belongs to the technical field of municipal engineering water supply, and in particular relates to a method for optimizing the setting of a pressure reducing valve of a water supply network based on global pressure regulation. Background Art

[0002] The leakage problem of water supply pipe network has always been an important problem in urban water supply management. With the acceleration of urbanization, the scale of water supply pipe network is expanding, and the complexity of water supply pipelines is also increasing year by year. However, the aging and leakage of water supply pipe network have intensified, which not only leads to a large loss of water resources, but also increases the operation and maintenance burden of the pipe network. In addition, the leakage problem of pipe network has an adverse effect on the energy efficiency of water supply system, further increasing energy consumption. Existing leakage control methods usually rely on manual inspection, regular maintenance and pipeline repair. Such methods are not only time-consuming and labor-intensive, but also difficult to fully cover the entire pipe network system. In particular, for hidden leakage points buried deep underground, leakage problems are often difficult to detect in time, resulting in long-term waste of water resources.

[0003] In recent years, the application of pressure management technology in water supply networks has provided a new technical path for leakage control. Studies have shown that the degree of leakage in water supply networks is closely related to the pressure level in the pipelines. By rationally regulating the water pressure in the network, the background leakage caused by high pressure can be effectively reduced, while reducing the incidence of pipe bursts. However, the current pressure management technology still mainly relies on manual experience for water pressure regulation and the arrangement of pressure regulating valves. Its operation process lacks systematic and scientific basis, and it is difficult to make precise adjustments according to actual water supply needs and network layout. This not only affects the control effect of the pressure reducing valve, but may also lead to insufficient water supply in local areas due to unreasonable pressure regulation, or excessive pressure in some areas, which in turn increases the risk of leakage. In addition, the existing pressure reducing valve arrangement method is often based on local pressure regulation, lacks a global optimization solution, and is difficult to improve the operating efficiency of the water supply system as a whole.

[0004] Patent document CN215929235U discloses a water supply network area pressure management system, including a control valve, a control module and a data center; the control module is connected to the control valve and the data center respectively; the control valve is used to adjust and control the pressure of the pipeline; the control module is used to collect the inlet and outlet pressure and flow data of the control valve, and is used to receive the control signal transmitted by the data center to regulate the opening and upper chamber pressure of the control valve; the data center is used to receive the inlet and outlet pressure signals and flow signals transmitted by the control module, and analyze and process the inlet and outlet pressure signals and flow signals; and convert the analyzed and processed signals into control signals and output them to the control module.

[0005] Patent document CN117688709A discloses a method for optimizing and scheduling a water supply network based on model predictive control, the method comprising: step S1, establishing a simulation model of a water supply network; step S2, establishing a water demand prediction model for water supply network users based on historical data of user flow in the water supply network to predict user flow at the next moment; step S3, performing primary optimization scheduling of the water supply network based on a particle swarm algorithm; step S4, performing secondary optimization scheduling of the water supply network based on a particle swarm algorithm based on the results of the primary optimization scheduling. Summary of the invention

[0006] The purpose of the present invention is to provide a method for optimizing the setting of pressure reducing valves in a water supply network based on global pressure regulation, which can solve the shortcomings of the traditional method that the arrangement of pressure reducing valves mainly relies on manual experience and simple hydraulic models.

[0007] In order to achieve the purpose of the present invention, the following technical method is provided: a method for optimizing the setting of a pressure reducing valve in a water supply network based on global pressure regulation, comprising the following steps: Obtain the basic information of the water supply network in the area to construct the corresponding water supply network topology; According to the relationship between the friction coefficient of each pipe in the topological structure of the water supply network and the water demand of the node under multiple working conditions, a relationship function is constructed and the relationship function is fitted based on the pressure and flow monitoring results in the water supply network in the region to obtain an offline hydraulic model of the network under multiple working conditions; Based on the offline hydraulic model simulation of the pipe network, the water supply path of each pipeline at each moment is obtained, and the total downstream water supply length of the pipeline at the corresponding moment is calculated based on the water supply path, and the maximum downstream pressure drop space of the corresponding pipeline at each moment is calculated according to the corresponding nodes on the water supply path and the total downstream water supply length; Based on the offline hydraulic model simulation of the pipe network, the flow rate and flow direction of each pipe at each moment are obtained; according to the water supply flow direction and the node position in the topological structure of the water supply pipe network, the downstream node set of each pipe at each moment is counted; according to the downstream node set and the total downstream water supply length of the corresponding pipe, the downstream water ratio of the corresponding pipe is calculated; Design corresponding evaluation indicators according to the preset arrangement quantity in the pressure reducing valve setting scheme, and traverse all pipes in the water supply network based on the evaluation indicators, select the pipe with the largest evaluation indicator to install the pressure reducing valve, and remove the installed pipes and repeatedly traverse the remaining pipes in the water supply network until the preset arrangement quantity is met; After the pressure reducing valve is installed, run the online hydraulic model of the water supply network at the current moment, calculate the minimum pressure downstream of each pressure reducing valve in the normally open state and the pressure in front of the pressure reducing valve, and thereby determine the pressure behind the valve of each pressure reducing valve at the current moment. Use this method to traverse all subsequent water supply moments to achieve real-time global pressure control of the water supply network.

[0008] Among them, the online hydraulic model of the water supply network is similar to the offline hydraulic model of the network in form and structure, and is distinguished only by the different data types. The input of the offline hydraulic model of the network is historical hydraulic data, and the input of the online hydraulic model of the water supply network is current hydraulic data.

[0009] The present invention takes into account factors such as pipe network layout, pressure distribution, water supply demand, etc. from a global perspective, and optimizes the design of the position, quantity and parameters of the pressure reducing valve to ensure that the pressure in the pipe network fluctuates within a reasonable range, thereby minimizing the background leakage rate and the probability of pipe burst.

[0010] Specifically, the basic information includes GIS information of the water supply network, the plane structure of the water supply plant, and the layout location and working parameters of the equipment.

[0011] Specifically, the multiple operating conditions include the highest daily operating condition, the lowest daily operating condition, the average daily operating condition, the working day condition, the holiday condition and the rest day condition.

[0012] Specifically, the expression of the total downstream water supply length is as follows: in, for Moment Pipeline Total length of downstream water supply pipeline; For pipeline Downstream pipe length ( ), for Moment Pipeline The downstream water supply pipe set, G represents the total number of pipes, and T represents the total simulation time.

[0013] Specifically, the expression of the downstream maximum pressure drop space is as follows: in, for Moment Pipeline Maximum permissible pressure drop; for Moment Pipeline Minimum downstream pressure; To meet the minimum service pressure required for normal water use by users, G represents the total number of pipelines, and T represents the total simulation time.

[0014] Specifically, the expression of the downstream water ratio is as follows: in, for Moment Pipeline Proportion of downstream water supply; for Moment Pipeline Downstream water supply path pipeline , where i is the starting node of the pipeline and j is the ending node of the pipeline. for Time flow into the node Total pipeline flow rate; For Node The proportion of water supply from upstream pipelines, G represents the total number of pipelines, and T represents the total simulation time.

[0015] Specifically, the expression of the evaluation index is as follows: in, represents the proportion of downstream water, Indicates the maximum downstream pressure drop space, Represents the total length of downstream water supply.

[0016] Specifically, when the pressure reducing valve is installed on a pipeline, a preset value of the post-valve pressure of the pressure reducing valve is set based on the difference between the maximum pressure reduction space downstream of the pipeline and the pre-valve pressure when the pressure reducing valve is installed on the pipeline.

[0017] Specifically, the process of real-time global pressure regulation is as follows: At the current moment, each pressure reducing valve is set to a normally open state, and the downstream minimum pressure of each pressure reducing valve in the normally open state and the pressure in front of the pressure reducing valve are obtained through the offline hydraulic model of the pipeline network; Based on the minimum service pressure required for normal water use by the user, the downstream pressure of each pressure reducing valve is adjusted. The expression is as follows: in, represents the minimum downstream pressure of the kth pressure reducing valve in the normally open state, It represents the pressure in front of the kth pressure reducing valve in the normally open state. Indicates the minimum service pressure required for normal water use by users.

[0018] Compared with the prior art, the present invention has the following beneficial effects: Through comprehensive analysis of the pressure distribution of the entire water supply network, the layout of the pressure reducing valve is optimized to ensure uniform pressure distribution in each area and avoid local high or low pressure problems; Combining real-time monitoring and feedback control technology, it can dynamically adjust the parameters of the pressure reducing valve according to the real-time water supply demand and pipeline network status, effectively respond to fluctuations in water demand in the pipeline network, ensure that the pressure in each time period is always within a reasonable range, and avoid the problem of insufficient or excessive pressure reduction caused by traditional static layout methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A flow chart of a method for optimizing the setting of a water supply network pressure reducing valve based on global pressure regulation provided in this embodiment; Figure 2 A schematic diagram of the water supply network topology provided in this embodiment; Figure 3 A diagram showing the arrangement of the water supply network pressure reducing valve provided in this embodiment; Figure 4 The global pressure distribution diagram of the water supply network before and after the pressure reducing valve position optimization provided in this embodiment. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] like Figure 1 As shown, a method for optimizing the setting of a water supply network pressure reducing valve based on global pressure regulation is provided in this embodiment, and the steps are as follows: Obtain relevant data such as water supply network GIS information, water plant plane structure, pump station and valve information of the water supply network in the region to build the corresponding water supply network topology, such as Figure 2 shown.

[0022] According to the relationship between the friction coefficient of each pipe in the topological structure of the water supply network and the water demand of the node under multiple working conditions, a relationship function is constructed and the relationship function is fitted based on the pressure and flow monitoring results in the water supply network in the region to obtain an offline hydraulic model of the network under multiple working conditions; The process in this embodiment is as follows: Select 6 typical daily operation conditions of the water supply network (highest day, lowest day, average day, working day, holiday and rest day), collect the water consumption information of each hour and initialize the node water demand of each hour (a total of Hour).

[0023] Collect pipeline material, pipe age and other attribute data to initialize the pipeline friction coefficient. At the same time, based on the historical observation data of each hour of the pressure and flow monitoring points (a total of hours), corrected the pipe friction coefficient in the water supply network model and the water demand of each node per hour, and finally established the offline hydraulic model of the network (total simulation time Hour).

[0024] Based on the offline hydraulic model simulation of the pipe network, the water supply path of each pipeline at each moment is obtained, and the total downstream water supply length of the pipeline at the corresponding moment is calculated based on the water supply path, and the maximum downstream pressure drop space of the corresponding pipeline at each moment is calculated according to the corresponding nodes on the water supply path and the total downstream water supply length; The process in this embodiment is as follows: run ( ) The offline hydraulic model of the water supply network at any time to determine the pipeline ( , The downstream water supply path is the collection of all pipes in the water supply network. .

[0025] Based on the water supply path, calculate ( ) Moment Pipeline ( ) The total length of the downstream water supply pipeline, the specific formula is as follows: Formula 1-1 In the formula, for Moment Pipeline Total length of downstream water supply pipeline; For pipeline Downstream pipe length ( ), for Moment Pipeline Downstream water supply pipeline collection.

[0026] calculate ( ) Moment Pipeline ( )The maximum pressure reduction space downstream, the specific formula is as follows: Formula 1-2 In the formula, for Moment Pipeline Maximum permissible pressure drop; for Moment Pipeline Minimum downstream pressure; The minimum service pressure required to meet normal water needs of users.

[0027] Based on the offline hydraulic model simulation of the pipe network, the flow rate and flow direction of each pipe at each moment are obtained; according to the water supply flow direction and the node position in the topological structure of the water supply pipe network, the downstream node set of each pipe at each moment is counted; according to the downstream node set and the total downstream water supply length of the corresponding pipe, the downstream water ratio of the corresponding pipe is calculated; The process in this embodiment is as follows: run ( ) The offline hydraulic model of the water supply network is used to determine the flow rate and flow direction of each pipe in the network, and the pipeline is determined according to the flow direction. ( )’s downstream water supply node set .

[0028] calculate ( ) Moment Pipeline ( ) The proportion of water supply at each moment in the downstream is as follows: Formula 1-3 In the formula, for Moment Pipeline Proportion of downstream water supply; for Moment Pipeline Downstream water supply path pipeline ( , Pipeline The flow of the starting node and the ending node of for Time flow into the node Total pipeline flow rate; For Node The proportion of upstream pipeline water supply.

[0029] According to the preset arrangement quantity in the pressure reducing valve setting scheme, the corresponding evaluation index is designed, and all pipes in the water supply network are traversed based on the evaluation index, and the pipe with the largest evaluation index is selected to install the pressure reducing valve, and the remaining pipes in the water supply network are repeatedly traversed after removing the installed pipes until the preset arrangement quantity is met, such as Figure 3 As shown, Figure 3 The triangle icon in the middle is a pressure reducing valve; The process in this embodiment is as follows: Develop a pipeline ( )Evaluation index when installing pressure reducing valve , the specific formula is as follows: Formula 1-4 Traverse all pipes in the water supply network and calculate each pipe according to formula 1-4 ( )Evaluation index when installing pressure reducing valve .

[0030] Select the largest The corresponding pipeline Install a pressure reducing valve, ( ) At this moment, the downstream pressure setting value of the pressure reducing valve is Formula 1-5 In the formula, For pipeline Installed pressure reducing valve The valve outlet pressure setting value at the moment; For pipeline Installed pressure reducing valve The pressure before the valve at the moment; for Moment Pipeline The maximum allowable pressure drop value (Formula 1-2).

[0031] Repeat the above steps until the number of pressure reducing valves installed meets the set number. .

[0032] After the pressure reducing valve is installed, run the online hydraulic model of the water supply network at the current moment, calculate the minimum pressure downstream of each pressure reducing valve in the normally open state and the pressure in front of the pressure reducing valve, and thereby determine the pressure behind the valve of each pressure reducing valve at the current moment. Use this method to traverse all subsequent water supply moments to achieve real-time global pressure control of the water supply network.

[0033] The specific process in this embodiment is as follows: For the current moment , set each pressure reducing valve to the normally open state.

[0034] Run the current water supply network online hydraulic model to calculate the current pressure reducing valve (k=1,2,…,N, N is the number of pressure reducing valves) Minimum downstream pressure in normally open state and pressure before the pressure reducing valve .

[0035] For the current moment , set the downstream pressure of each pressure reducing valve , the formula is as follows: Formula 1-6 In the formula, The minimum service pressure required to meet normal water needs of users.

[0036] For the next moment , execute the above steps to realize real-time global pressure control of the water supply network.

[0037] like Figure 4 As shown in the figure, this is the global pressure distribution diagram of the water supply network before and after the optimization of the pressure reducing valve position. It can be seen from the figure that the red high-pressure part is obviously eliminated, while the proportion of the green safety range increases.

[0038] In summary, the present invention comprehensively analyzes and dynamically regulates the pressure of the entire water supply network, thereby overcoming the limitations of traditional methods. Compared with traditional methods, it has the following advantages: ① Global optimization and regulation: The present invention comprehensively analyzes the pressure distribution of the entire water supply network, optimizes the layout position of the pressure reducing valve, ensures that the pressure in each area is evenly distributed, and avoids local high or low pressure problems; ② Dynamic adjustment capability: The present invention combines real-time monitoring and feedback control technology, and can dynamically adjust the parameters of the pressure reducing valve according to the real-time water supply demand and the state of the network, and can effectively respond to the fluctuation of water demand in the network, ensuring that the pressure in each time period is always within a reasonable range, avoiding the problem of insufficient or excessive pressure reduction caused by the traditional static layout method; ③ Reduce maintenance costs: The present invention can reduce the average pressure of the network through global optimization, reduce the background leakage and burst rate in the network, and thus can significantly reduce the maintenance cost and maintenance workload of the water supply system, extend the service life of the pipeline, and further reduce the operating cost of the system.

[0039] In addition, the terms "upper", "lower", "inner", "outer", "front", "rear" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Unless otherwise specifically stated, the relative steps, numerical expressions and values ​​of the components and steps described in these embodiments do not limit the scope of the present invention.

[0040] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

[0041] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for optimizing the setting of a water supply network pressure reducing valve based on global pressure regulation, characterized in that: The following steps are involved: Obtain basic information about the water supply network in the region to build the corresponding water supply network topology; According to the relationship between the friction coefficient of each pipe in the topological structure of the water supply network and the water demand of the node under multiple working conditions, a relationship function is constructed and the relationship function is fitted based on the pressure and flow monitoring results in the water supply network in the region to obtain an offline hydraulic model of the network under multiple working conditions; Based on the offline hydraulic model simulation of the pipe network, the water supply path of each pipeline at each moment is obtained, and the total downstream water supply length of the pipeline at the corresponding moment is calculated based on the water supply path, and the maximum downstream pressure drop space of the corresponding pipeline at each moment is calculated according to the corresponding nodes on the water supply path and the total downstream water supply length; Based on the offline hydraulic model simulation of the pipe network, the flow rate and flow direction of each pipe at each moment are obtained; according to the water supply flow direction and the node position in the topological structure of the water supply pipe network, the downstream node set of each pipe at each moment is counted; according to the downstream node set and the total downstream water supply length of the corresponding pipe, the downstream water ratio of the corresponding pipe is calculated; Design corresponding evaluation indicators according to the preset arrangement quantity in the pressure reducing valve setting scheme, and traverse all pipes in the water supply network based on the evaluation indicators, select the pipe with the largest evaluation indicator to install the pressure reducing valve, and remove the installed pipes and repeatedly traverse the remaining pipes in the water supply network until the preset arrangement quantity is met; Real-time global pressure control of the water supply network based on the fully installed pressure reducing valve.

2. The method for optimizing the setting of the water supply network pressure reducing valve based on global pressure regulation according to claim 1 is characterized in that: The basic information includes GIS information of the water supply network, the planar structure of the water supply plant, and the layout location and working parameters of the equipment.

3. The method for optimizing the setting of the water supply network pressure reducing valve based on global pressure regulation according to claim 1 is characterized in that: The multiple operating conditions include the highest daily operating condition, the lowest daily operating condition, the average daily operating condition, the working day condition, the holiday condition and the rest day condition.

4. The method for optimizing the setting of the water supply network pressure reducing valve based on global pressure regulation according to claim 1, characterized in that: The expression of the total downstream water supply length is as follows: in, for Moment Pipeline Total length of downstream water supply pipeline; For pipeline Downstream pipe length ( ), for Moment Pipeline The downstream water supply pipe set, G represents the total number of pipes, and T represents the total simulation time.

5. The method for optimizing the setting of pressure reducing valves in a water supply network based on global pressure regulation according to claim 1, characterized in that: The expression of the maximum downstream pressure drop space is as follows: in, for Moment Pipeline Maximum permissible pressure drop; for Moment Pipeline Minimum downstream pressure; To meet the minimum service pressure required for normal water use by users, G represents the total number of pipelines, and T represents the total simulation time.

6. The method for optimizing the setting of the water supply network pressure reducing valve based on global pressure regulation according to claim 1, characterized in that: The expression of the downstream water ratio is as follows: in, for Moment Pipeline Proportion of downstream water supply; for Moment Pipeline Downstream water supply path pipeline , where i is the starting node of the pipeline and j is the ending node of the pipeline. for Time flow into the node Total pipeline flow rate; For Node The proportion of water supply from upstream pipelines, G represents the total number of pipelines, and T represents the total simulation time.

7. The method for optimizing the setting of pressure reducing valves in a water supply network based on global pressure regulation according to claim 1, characterized in that: The expression of the evaluation index is as follows: in, represents the proportion of downstream water, Indicates the maximum downstream pressure drop space, Represents the total length of downstream water supply.

8. The method for optimizing the setting of pressure reducing valves in a water supply network based on global pressure regulation according to claim 1, characterized in that: When the pressure reducing valve is installed on a pipeline, a preset value of the valve back pressure of the pressure reducing valve is set based on the difference between the maximum pressure reduction space downstream of the pipeline and the valve front pressure when the pressure reducing valve is installed on the pipeline.

9. The method for optimizing the setting of pressure reducing valves in a water supply network based on global pressure regulation according to claim 1, characterized in that: The process of real-time global pressure regulation is as follows: At the current moment, each pressure reducing valve is set to a normally open state, and the downstream minimum pressure of each pressure reducing valve in the normally open state and the pressure in front of the pressure reducing valve are obtained through the offline hydraulic model of the pipeline network; Based on the minimum service pressure required for normal water use by the user, the downstream pressure of each pressure reducing valve is adjusted. The expression is as follows: in, represents the minimum downstream pressure of the kth pressure reducing valve in the normally open state, It represents the pressure in front of the kth pressure reducing valve in the normally open state. Indicates the minimum service pressure required for normal water use by users.

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