A progressively reconfigurable water supply network zoning method

Abstract

The present invention discloses a progressively reconfigurable water supply network zoning method, comprising the following steps: 1. establishing a hydraulic model of the entire network and obtaining hydraulic parameters; 2. selecting a set of closable valves and, based on the hydraulic characteristic parameters, selecting valves with the least impact on the network; 3. partitioning the network, setting the number of zones, and installing metering equipment along the main water supply path to form independent zones; 4. reconstructing the zones, calculating the leakage index of the zones, and separating and merging the zones according to the target index values ​​through dynamic valve control; 5. progressively partitioning the zones step by step, selecting areas with high leakage indexes, setting the minimum size of the zones, and repeating steps 3 and 4 to complete the zoning. The present invention proposes a method for reconstructing zones through dynamic valve control between zones, identifying high leakage areas, and gradually refining the zones to reduce the leakage range. The present invention is a water supply network zoning method that reduces costs and ensures water quality. The present invention has application in the field of urban water supply.

Description

Technical Field

[0001] The present invention relates to a method for zoning a water supply network, in particular to a progressively reconfigurable method for zoning a water supply network. Background Art

[0002] Domestic and international practice has proven that zoning water supply networks is an effective measure for controlling network leakage. However, current zoning methods, both domestically and internationally, select metering equipment and shutoff valve locations based on specific objectives and network structure. These metering equipment and shutoff valves are typically installed once and remain fixed during operation. In China, especially in urban areas, where ring networks are predominant, ring networks have many more zoning boundaries than branch networks. Consequently, installing more metering equipment increases investment and operating costs, while over-closing valves can lead to "stagnant water" and water quality issues.

[0003] The purpose of zoning is to gradually reduce the scope of leaks in the pipe network, making it easier to detect and repair them. However, as water supply networks develop and the locations of leaks change dynamically, static zoning methods based on pre-planned and fixed metering equipment are bound to lead to blind investment.

[0004] Therefore, those skilled in the art are committed to developing a water supply network zoning method that can reduce zoning management costs and have a smaller zoning range. Summary of the Invention

[0005] The present invention aims to provide a progressively reconfigurable water supply network zoning method. This method uses dynamic control of valves between zones to achieve zoning reconfiguration, identify high-leakage areas, and gradually refine the zones to reduce the scope of leakage. This approach reduces costs, increases the number of zones, reduces the scope of leakage, and avoids water quality issues.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a progressively reconfigurable water supply network zoning method, characterized in that the method includes the following steps: Step 1, establishing a hydraulic model of the entire network and obtaining hydraulic parameters; Step 2, selecting a set of closable valves, and selecting valves with the least impact on the network based on hydraulic characteristic parameters; Step 3, partitioning the network, setting the number of partitions, and installing metering equipment in the direction of the main water supply path to form independent partitions; Step 4, partition reconstruction, counting the leakage index of the partitions, and realizing the separation and merging of partitions through dynamic valve control according to the target value of the index; Step 5, gradual partitioning, selecting areas with high leakage index, setting the minimum size of the partition, and repeating steps 3 and 4 to complete the partitioning.

[0007] Furthermore, the specific steps of the method are as follows:

[0008] Step 1: Establish a hydraulic model of the entire pipe network and obtain hydraulic parameters such as pipe network pressure, flow, flow velocity, and flow direction;

[0009] Step 2: Select a set of closable valves and choose the valve with the least impact on the pipe network based on hydraulic characteristic parameters;

[0010] Step 2 includes the following steps:

[0011] a. Initialization parameter, N open is the total number of valves currently in the open state, d limit Set value for pipeline parameter change, P limit is the pressure setting value;

[0012] b. Select a valve V in the open state i , V i The valve numbered i is the valve in the set of all valves currently open, i∈N open , set dv min =∞,i min =0, where dv is the maximum absolute value of the pipeline flow velocity comparison before and after a valve is closed, dv min is the minimum value of all valve dv, i min for dv min Corresponding valve number;

[0013] c. V i The valve is closed and hydraulic calculations are performed;

[0014] d. Get the minimum pressure of all nodes P n is the water pressure at node n, if P min <P limit Then go to step g, otherwise go to the next step;

[0015] e. Get V i The maximum absolute value of the flow velocity comparison value of all pipelines before and after the valve is closed, that is, is the flow rate of the pipe numbered l before the valve is closed, is the flow rate of the pipe numbered l after the valve is closed;

[0016] f. Record the valve number that has the least impact on the pipeline before and after the valve is closed. If dv i <dv min , update i min =i, otherwise go to the next step;

[0017] g. Open V i Valve, i=i+1, if i≤N open Then go to step b, otherwise go to the next step;

[0018] h. If dv min ≤d limit Close imin Corresponding valve, and add the valve to the closable valve set, update N open =N open -1, go to step b, otherwise go to the next step;

[0019] i. End the calculation and obtain the set of closable valves.

[0020] Step 3: Divide the pipe network. After all the closable valves selected in Step 2 are closed, divide the pipe network into zones, determine the number of zones, and install metering equipment in the direction of the main water supply path to form dynamic zones with independent metering. The principle is to install the least amount of metering equipment and form zones of similar size.

[0021] Step 4: Reconstruct the partitions, calculate the leakage index of the partitions, and realize the separation and merging of the partitions through dynamic valve control according to the target value of the index. When the leakage index in a partition exceeds the set value, some valves can be closed, and at the same time, more than one independent metering partition can be formed after the valves are closed;

[0022] Step 5: Gradually partition the area, select the area with high leakage index, set the minimum size of the partition, and repeat steps 3 and 4 to complete the partition.

[0023] Step 5 includes the following steps:

[0024] a. Count the leakage indicators of all current partitions;

[0025] b. Select the area where the leakage rate exceeds the target value;

[0026] c. Determine whether the selected area is the minimum reconfigurable partition. If so, proceed to step d. If not, close the valves in the selected area for reconfiguration and then proceed to step d.

[0027] d. Further partition the area through steps 3 and 4 until the minimum size partition is obtained.

[0028] This partitioning method has obvious technical characteristics:

[0029] (1) Install fewer flow meters to achieve more partitions, especially in ring pipe networks;

[0030] (2) Without adding additional equipment, partition reconstruction can be achieved through the control of existing valves;

[0031] (3) Reconstruct the zones according to the leakage index, subdivide the areas with high index and merge the areas with low index;

[0032] (4) Reconstruct the zones according to the pipe network load, select the low-peak period for regional subdivision, and merge the zones during the peak period for regional merging.

[0033] (5) Since the leakage range is smaller, high leakage areas can be found quickly;

[0034] (6) Refine the zoning based on high leakage indicators to make the next level of zoning more targeted;

[0035] (7) By making full use of the existing valve dynamic management, water quality risks can be effectively reduced and initial costs can be reduced.

[0036] The present invention is applicable to a water supply network that has not been partitioned, and is also applicable to the re-partitioning and dynamic management of a partitioned network. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention is a progressively reconfigurable water supply network zoning method, as shown in the following figures:

[0038] Attachment Figure 1 is a flow chart of the method of the present invention;

[0039] Attachment Figure 2 Schematic diagram of the partitioning and re-partitioning method of the present invention;

[0040] Attachment Figure 3 It is a schematic diagram of gradual partitioning;

[0041] Attachment Figure 4 4 is a pipe network zoning diagram of an embodiment. DETAILED DESCRIPTION

[0042] The following is a further detailed description of a progressively reconfigurable water supply network zoning method of the present invention.

[0043] The present invention will be described in more detail with reference to the accompanying drawings, in which preferred embodiments of the present invention are shown. It should be understood that those skilled in the art may modify the invention described herein while still achieving the advantageous effects of the invention. Therefore, the following description should be understood as a general guide for those skilled in the art and not as a limitation of the present invention.

[0044] In order to make the purpose and features of the present invention more obvious and easy to understand, the specific embodiments of the present invention are further described below with reference to the accompanying drawings.

[0045] like Figure 1 As shown, the method of the present invention includes the following specific steps

[0046] Step 1: Establish a hydraulic model of the entire pipe network and obtain hydraulic parameters such as pipe network pressure, flow, flow velocity, and flow direction;

[0047] Step 2: Select a set of closable valves and perform closing calculations on the valves in sequence. Each time, select a valve with the smallest maximum value of all pipeline parameter changes before and after valve closing. At the same time, the network node pressure after closing must be greater than the set value, and the maximum value of pipeline parameter changes must be less than the set value.

[0048] Step 3: Divide the pipe network into zones after the valves are closed, determine the number of zones, and install metering equipment in the direction of the main water supply path to form dynamic zones that can be independently measured. The principle is to install the least amount of metering equipment and form zones of similar size.

[0049] Step 4: Reconstruct the partitions, calculate the leakage index of the partitions, and realize the separation and merging of the partitions through dynamic valve control according to the target value of the index. When the leakage index in a partition exceeds the set value, some valves can be closed, and at the same time, more than one independent metering partition can be formed after the valves are closed;

[0050] Step 5: Gradually partition the area, select the area with high leakage index, set the minimum size of the partition, and repeat steps 3 and 4 to complete the partition.

[0051] In step 2, considering the water needs of users, after closing the valve, the pressure of the pipeline node must meet the service requirements, the parameter for evaluating the change of pipeline parameters is flow rate or flow velocity, and the maximum absolute value of the difference of all pipeline indicators after the valve is closed is less than the set value.

[0052] In step 3, the installation of metering equipment at the partition boundaries is determined by taking into account the characteristics of the partitions, uniform pressure distribution within the partitions, minimization of the number of partition boundaries, and comparable partition sizes.

[0053] In step 4, no additional equipment is added, and zoning reconstruction is achieved through the control of existing valves; zoning reconstruction is performed based on leakage indicators, and areas with high indicators are subdivided and areas with low indicators are merged; zoning reconstruction is performed based on pipe network load, and areas are subdivided during low water consumption periods, and areas are merged during peak water consumption periods.

[0054] The step 5 is applicable to the rezoning and dynamic management of the already zoned pipe network.

[0055] Figure 2 The specific steps are as follows: Step 3 Pipeline Network Partitioning and Step 4 Reconstruction Partitioning

[0056] a. Establish a hydraulic model, select closed valves, and install flow meters for zoning;

[0057] b. Reconstruct the partitions and, based on the leakage index, choose to open all closed valves or close some valves.

[0058] Figure 3 The specific steps of step 5 are step-by-step partitioning

[0059] a. Count the leakage indicators of all current partitions;

[0060] b. Select the area where the leakage rate exceeds the target value;

[0061] c. Determine whether the selected area is the minimum reconfigurable partition. If so, proceed to step d. If not, close the valves in the selected area for reconfiguration and then proceed to step d.

[0062] d. Further partition the area through steps 3 and 4 until the minimum size partition is obtained;

[0063] Figure 4 It is the partitioning scheme determined by this method.

[0064] The embodiments described above are merely descriptions of preferred implementations of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A progressively reconfigurable water supply network zoning method, characterized in that The method comprises the following steps: establishing a hydraulic model of the entire pipe network and obtaining hydraulic parameters; Select a set of closable valves and choose the valves with the least impact on the pipe network based on hydraulic characteristic parameters; Divide the pipe network, set the number of zones, and install metering equipment in the direction of the main water supply path to form independent zones; Reconstruct partitions, calculate partition leakage indicators, and dynamically control valves to separate and merge partitions according to target values. Gradually partition the area, select the area with high leakage index, set the minimum size of the partition, and repeat steps 3 and 4 to complete the partition; The specific steps are as follows: Step 1, establish a hydraulic model of the entire pipe network to obtain pipe network pressure, flow, flow velocity, and flow direction parameters; Step 2: Select a set of closable valves and perform closing calculations on the valves in sequence. Each time, select a valve with the smallest maximum value of all pipeline parameter changes before and after valve closing. At the same time, the network node pressure after closing must be greater than the set value, and the maximum value of pipeline parameter changes must be less than the set value. Step 3: Divide the pipe network into zones after the valves are closed, determine the number of zones, and install metering equipment in the direction of the main water supply path to form dynamic zones that can be independently measured. The principle is to install the least amount of metering equipment and form zones of similar size. Step 4: Reconstruct the zones. Count the zone leakage indicators and dynamically control the valves according to the target values. When the leakage indicator in a zone exceeds the set value, some valves can be closed to ensure that more than one independent metering zone is formed after the valves are closed. Reconstruct the zones according to the leakage indicators, subdivide the areas with high indicators, and merge the areas with low indicators. Reconstruct the zones according to the network load, subdivide the areas during low-peak water consumption, and merge the areas during peak water consumption. Step 5: Gradually partition the area, select the area with high leakage index, set the minimum size of the partition, and repeat steps 3 and 4 to complete the partition; Step 2 includes the following steps: a. Initialization parameter, N open is the total number of valves currently in the open state, d limit Set value for pipeline parameter change, P limit is the pressure setting value; b. Select a valve Vi in an open state. Vi is the valve numbered i among all the valves in the current open state. i∈N open , set dv min =∞,i min =0, where dv is the maximum absolute value of the pipeline flow velocity comparison before and after a valve is closed, dv min is the minimum value of all valve dv, i min for dv min Corresponding valve number; c. Close the Vi valve and perform hydraulic calculations; d. Get the minimum pressure value P of all nodes min =min 0≤n≤N (P n ), P n is the water pressure at node n, if P min <P limit , then go to step g, otherwise go to the next step; e. Get V i The maximum absolute value of the flow velocity comparison value of all pipelines before and after the valve is closed, that is, is the flow rate of the pipe numbered l before the valve is closed, is the flow rate of the pipe numbered l after the valve is closed; f. Record the valve number that has the least impact on the pipeline before and after the valve is closed. If dv i <dv min , update i min =i, otherwise go to the next step; g. Open V i Valve, i=i+1, if i≤N open Then go to step b, otherwise go to the next step; h. If dv min ≤d limit Close i min Corresponding valve, and add the valve to the closable valve set, update N open =N open -1, go to step b, otherwise go to the next step; i. End the calculation and obtain the set of closable valves.

2. A progressively reconfigurable water supply network zoning method according to claim 1, characterized in that Step 5 includes the following steps: a. Counting the leakage indicators of all current partitions; b. Select the area where the leakage rate exceeds the target value; c. Determine whether the selected area is the minimum reconfigurable partition. If so, proceed to step d. If not, close the valves in the selected area for reconfiguration and then proceed to step d. d. Further partition the area through steps 3 and 4 until the minimum size partition is obtained.

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