A water supply scheduling method based on the lowest operating energy consumption

Abstract

This invention provides a water network supply scheduling method based on the lowest operating energy consumption. It acquires information on water sources, receiving water plants, and reservoirs within the water network, along with their connectivity and supply relationships, to construct the urban water network topology. It organizes the water supply routes from each water source to reservoir to receiving water plant and calculates their energy consumption. The method then filters and summarizes these routes to obtain the optimal energy-consuming water supply network for the urban water supply system. Addressing the non-uniqueness of water transmission paths from receiving water plants to water sources in the complex urban water network system, the method globally searches for the lowest unit operating energy-consuming water transmission path from each receiving water plant to each water source. This is combined with analysis of the available water supply and the water demand of the receiving water plants to scientifically determine the water source and transmission path for each water plant, resulting in the optimal energy-consuming water supply network for the urban water supply system. Finally, it formulates a water network supply scheduling plan, effectively reducing the operating energy consumption of urban water supply scheduling and improving environmental and economic benefits.

Description

Technical Field

[0001] This invention belongs to the field of water resource scheduling technology and relates to a water network water supply scheduling method. Background Technology

[0002] With the advancement of urbanization and the continuous expansion of urban areas, populations and socio-economic activity have become more concentrated. To improve the security of urban water supply, most cities have constructed multi-source water supply networks, interconnecting these sources through urban water transmission projects. Numerous pumping stations are installed within these networks to enhance water supply security, but this also makes the urban water supply network structure more complex. During daily water supply scheduling, the water source and transmission route are often difficult to determine quickly, frequently resulting in suboptimal solutions for both. This undoubtedly leads to high energy consumption and low environmental and economic benefits in daily water supply scheduling. Summary of the Invention

[0003] To address the problems described in the background section, this invention provides a water supply scheduling method for water networks based on the lowest operating energy consumption.

[0004] The technical solution of the present invention includes the following steps:

[0005] Step 1: Obtain information on water sources, receiving water plants, and reservoirs in the water network, as well as the connectivity and supply relationships between them, and construct the urban water network topology.

[0006] Step 2: Organize the water supply lines of each water source, reservoir, and receiving water plant in the water network, and calculate their energy consumption values;

[0007] Step 3: Select the water supply routes with the lowest unit operating energy consumption among the water supply routes with the same water source-reservoir-water plant, and summarize them to obtain the set of water supply routes with the lowest unit operating energy consumption for each water source-reservoir-water plant, thus obtaining the optimal energy consumption water supply network for the urban water supply system.

[0008] Step 4: Prioritize water supply to the water supply line with the lowest unit operating energy consumption along the water transmission route. Combine the available water supply from the water source with the water demand of the receiving water plant to formulate a water network water supply scheduling plan and calculate the operating energy consumption of the urban water supply system.

[0009] Furthermore, in step one, the information on water sources, receiving water plants, and reservoirs in the water network is first obtained, and the number and location information of water supply nodes in the urban water network, including water diversion points from outside the city, water supply reservoirs, and receiving water plants, are clarified. Then, a schematic diagram is used to symbolically describe the location, position, and relative orientation and distance of the water supply nodes within the urban area. Next, the water supply nodes are connected through water transmission pipelines, and finally, a three-level tree-shaped network topology diagram of water source-reservoir-receiving water plant is obtained.

[0010] Furthermore, in step two, the water supply routes of each water source-reservoir-receiving water plant in the water network are organized according to the water supply paths of single water source-single water plant, single water source-multiple water plants, and multiple water sources-multiple water plants.

[0011] Furthermore, in step two, the calculation method for the unit energy consumption of the water supply path from water source to reservoir to receiving water plant is as follows: Clarify the operating parameters of the pumping station units and the number of pumps (m) on the water supply line, and calculate the operating energy consumption value A of the water supply line per unit time for transporting one cubic meter of water:

[0012]

[0013] In the formula, P m Q represents the power of the m-th water pump. m H is the design flow rate of the m-th water pump; m Let n be the head of the m-th water pump; 1m Let n be the efficiency of the m-th water pump; 2m Let ρ be the motor efficiency of the m-th water pump; ρ be the density of water; and g be the acceleration due to gravity.

[0014] Furthermore, in step three, the water supply line with the lowest unit operating energy consumption among a single water source-reservoir-single receiving water plant is selected, resulting in the water supply line with the lowest unit operating energy consumption among a single water source-reservoir-multiple receiving water plants. Finally, these are summarized into an optimal energy-consumption water supply network for a city water supply system with multiple water sources-reservoirs-multiple receiving water plants. Because this water supply network may have situations where some water sources cannot supply certain receiving water plants, the number of water supply lines with the lowest operating energy consumption is N. The optimal energy-consumption water supply network for the city water supply system is composed of N water supply lines.

[0015] N≤ab,

[0016] Where a and b represent the number of water sources and water receiving plants in the water network, respectively.

[0017] Furthermore, in step four, the energy consumption E of the urban water supply system is:

[0018]

[0019] Where N represents the number of water supply lines in the city's energy-optimal water supply network; A N The operating energy consumption value for supplying a unit flow rate per unit time to the Nth water supply line; q N t represents the water flow rate of the Nth water supply line. N This represents the average operating time of the pump unit for the Nth water supply line.

[0020] Compared with existing technologies, this invention addresses the issue of non-unique water transmission paths between receiving water plants and supply sources in complex urban water supply systems. By globally traversing and searching for the water transmission path with the lowest unit operating energy consumption from each receiving water plant to each supply source, and combining the available water supply and the water demand of the receiving water plants for analysis, the water supply source and transmission path of each supply plant are scientifically determined, resulting in the optimal energy consumption water supply network for the urban water supply system. This leads to the formulation of a water network water supply scheduling scheme, effectively reducing the operating energy consumption of urban water supply scheduling and improving environmental and economic benefits. Attached Figure Description

[0021] Figure 1 This is a flowchart of the method of the present invention.

[0022] Figure 2 This is a schematic diagram of the water network structure according to an embodiment of the present invention.

[0023] Figure 3 This is a water supply route diagram for a single water source and a single water plant according to an embodiment of the present invention.

[0024] Figure 4 This is a water supply route diagram for a single water source and multiple water plants according to an embodiment of the present invention.

[0025] Figure 5 This is a water network water supply scheduling scheme according to an embodiment of the present invention. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0027] A water supply scheduling method based on the lowest operating energy consumption is illustrated in the flowchart below. Figure 1 As shown, the details are as follows.

[0028] Step 1: Obtain information on water sources, receiving water plants, and reservoirs in the water network, as well as the connectivity and supply relationships between them, and construct the urban water network topology.

[0029] Specifically, the process begins by acquiring information on water sources, receiving water plants, and reservoirs within the water network, and then determining the number and location of water supply nodes in the urban water network, including external water intake points, water supply reservoirs, and receiving water plants. A schematic diagram is then used to symbolically describe the location, position, and relative orientation and distance of the water supply nodes within the urban area. Next, water supply nodes are connected via water pipelines, ultimately resulting in a three-level tree-structured network topology diagram of the water source-reservoir-receiving water plant.

[0030] Step 2: Organize the water supply lines of each water source, reservoir, and receiving water plant in the water network, and calculate their energy consumption values.

[0031] Specifically, the water supply routes of each water source-reservoir-receiving water plant in the water network are organized according to the water supply paths of single water source-single water plant, single water source-multiple water plants, and multiple water sources-multiple water plants.

[0032] The calculation method for unit energy consumption along the water supply path from water source to reservoir to receiving water plant is as follows: Clarify the operating parameters of the pumping stations and the number of pumps (m) along the water supply line, and calculate the operating energy consumption value A for transporting one cubic meter of water per unit time along the water supply line:

[0033]

[0034] In the formula, P m Q represents the power of the m-th water pump. m H is the design flow rate of the m-th water pump; m Let n be the head of the m-th water pump; 1m Let n be the efficiency of the m-th water pump; 2m Let ρ be the motor efficiency of the m-th water pump; ρ be the density of water; and g be the acceleration due to gravity.

[0035] Step 3: Select the water supply routes with the lowest unit operating energy consumption among those with the same water source-reservoir-receiving water plant, and summarize them to obtain the set of water supply routes with the lowest unit operating energy consumption for each water source-reservoir-receiving water plant, thus obtaining the optimal energy consumption water supply network for the urban water supply system.

[0036] Specifically, the water supply line with the lowest unit operating energy consumption among a single water source-reservoir-single water treatment plant is selected. This yields the water supply lines with the lowest unit operating energy consumption among a single water source-reservoir-multiple water treatment plants. Finally, these are aggregated into an optimal energy consumption water supply network for a city water supply system with multiple water sources-reservoirs-multiple water treatment plants. Because this water supply network may have situations where some water sources cannot supply some water treatment plants, the number of water supply lines with the lowest operating energy consumption is N. The optimal energy consumption water supply network for this city water supply system consists of N water supply lines.

[0037] N≤ab,

[0038] Where a and b represent the number of water sources and water receiving plants in the water network, respectively.

[0039] Step 4: Prioritize water supply to the water supply line with the lowest unit operating energy consumption along the water transmission route. Combine the available water supply from the water source with the water demand of the receiving water plant to formulate a water network water supply scheduling plan and calculate the operating energy consumption of the urban water supply system.

[0040] Specifically, the energy consumption E of the urban water supply system is:

[0041]

[0042] Where N represents the number of water supply lines in the city's energy-optimal water supply network; A N The operating energy consumption value for supplying a unit flow rate per unit time to the Nth water supply line; q N t represents the water flow rate of the Nth water supply line. N This represents the average operating time of the pump unit for the Nth water supply line.

[0043] Example

[0044] Figures 2-5 In the diagram, the numbers inside the circles represent the water source serial number, the numbers inside the squares represent the water receiving plant serial number, and the numbers inside the triangles represent the reservoir serial number. Figure 1 The diagram shows the topology of the urban water network. It includes four elements: water source, reservoir, water treatment plant, and water transmission line. The water transmission line is represented by a solid line with an arrow, and the arrow indicates the direction of water supply. Figures 3-5 This is a schematic diagram of the calculation steps of the method of the present invention. The dashed line represents the water supply line, and the solid line represents the actual water supply line.

[0045] Step 1: Obtain information on water sources, receiving water plants, and reservoirs within the water network, as well as the connectivity and supply relationships between them. The resulting urban water network topology is shown below. Figure 2 As shown, Figure 2 Information on the various water supply lines in China is shown in Table 1 below.

[0046] Table 1 Energy Consumption Information for Water Supply Line Operation

[0047]

[0048] according to Figure 2 As can be seen from Table 1, water source ① is a water supply plant. Water source ② can be supplied to water plants

[0049] Step 2: Organize the water supply lines of each water source, reservoir, and receiving water plant in the water network, and calculate their energy consumption values.

[0050] The complexity of water networks is often reflected in the diverse paths that water from a certain water source to a certain receiving water plant takes.

[0051] (1) Single water source - single water plant

[0052] Because the water supply routes from a single water source to a single water treatment plant in a water network are diverse, this invention addresses this issue by selecting the water transmission route with the lowest unit operating energy consumption from a single water source to a reservoir and then to the single water treatment plant, based on the principle of "prioritizing lower energy consumption." Figure 3 As shown.

[0053] (2) Single water source - multiple water plants

[0054] The water supply source can supply water to multiple receiving water plants. Based on the results of a single water supply source-reservoir-single receiving water plant obtained in (1), the water conveyance path with the lowest unit operating energy consumption in a complex water network is obtained by integrating the results of a single water supply source-reservoir-multiple receiving water plants, such as... Figure 4 As shown.

[0055] (3) Multiple water sources - multiple water plants

[0056] (1) and (2) analyses were performed on each water supply source to obtain the set of water transport paths with the lowest unit operating energy consumption in a complex water network, consisting of multiple water supply sources, reservoirs, and multiple receiving water plants, such as... Figure 3 As shown in Table 2 below.

[0057] Table 2. Information on Optimal Energy Consumption Water Supply Routes for Multiple Water Sources and Water Plants in the Water Network

[0058]

[0059] Step 3: Select the water supply routes with the lowest unit operating energy consumption among those with the same water source-reservoir-receiving water plant, and summarize them to obtain the set of water supply routes with the lowest unit operating energy consumption for each water source-reservoir-receiving water plant, thus obtaining the optimal energy consumption water supply network for the urban water supply system.

[0060] Information on water supply lines is shown in Table 3.

[0061] Table 3 Information on Water Supply Lines in the Water Network

[0062]

[0063]

[0064] Step 4: Prioritize water supply to the water supply line with the lowest unit operating energy consumption along the water transmission route. Combine the available water supply from the water source with the water demand of the receiving water plant to formulate a water network water supply scheduling plan and calculate the operating energy consumption of the urban water supply system.

[0065] Water supply scheduling plan such as Figure 5 As shown.

[0066] Water is supplied sequentially according to the principle of "prioritizing water supply based on the lowest unit operating energy consumption":

[0067] (1) Water source ② (water supply of 100m³) 3 / d) Water supply to water plant (Water demand 30m) 3 / d); Water source ② has 70m of remaining available water.3 / d, water plant Remaining water demand: 0m³ 3 If the energy consumption per day is 5.8 × 30 = 174, then the daily energy consumption of this line is 5.8 × 30 = 174.

[0068] (2) Water source ② (remaining available water volume 70m) 3 / d) Water supply plant (Water demand 50m) 3 / d); Water source ② has 20m of remaining available water. 3 / d, water plant Remaining water demand: 0m³ 3 If the energy consumption of this line is 6.0 × 50 = 300 per day, then the daily energy consumption of this line is 6.0 × 50 = 300.

[0069] (3) Water source ① (water supply of 30m³) 3 / d) Available for supply to water plants But the water plant The water demand has been met, therefore no water supply is needed.

[0070] (4) Water source ① (water supply of 30m³) 3 / d) Water supply to water plant (Water demand 50m) 3 / d); Water source ① Remaining available water 0m 3 / d, water plant (Remaining water demand 20m) 3 If the energy consumption of the line is 6.5 × 30 = 195 per day (d), then the daily energy consumption of the line is 6.5 × 30 = 195.

[0071] (5) Water source ② (remaining available water volume 20m) 3 / d) Available for supply to water plants (Remaining water demand 20m) 3 / d); Water source ② Remaining available water 0m 3 / d, water plant Remaining water demand: 0m³ 3 If the energy consumption per day is 12.4 × 20 = 248, then the daily energy consumption of this line is 12.4 × 20 = 248.

[0072] Ultimately, the water plant in this example's water supply network (Total water requirement: 130m) 3 / d) Water demand is met, water sources ① and ② (total water supply 130m³) 3 / d) No water is available, and the daily energy consumption of the water network is 174+300+195+248=917.

[0073] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application can be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0074] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0075] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0076] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0077] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0078] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A water supply scheduling method for a water network based on the lowest operating energy consumption, characterized in that, Includes the following steps: Step 1: Obtain information on water sources, receiving water plants, and reservoirs in the water network, as well as the connectivity and supply relationships between them, and construct the urban water network topology: First, obtain information on water sources, receiving water plants, and reservoirs in the water network, and clarify the number and location information of water supply nodes in the urban water network, including external water intake points, water supply reservoirs, and water receiving water plants. Then, use a schematic diagram to symbolically describe the location, position, and relative orientation and distance of water supply nodes within the urban area. Next, connect each water supply node through water transmission pipelines, and finally obtain a three-level tree-structured network topology diagram of water source-reservoir-receiving water plant. Step 2: Organize the water supply routes of each water source-reservoir-receiving water plant in the water network and calculate their energy consumption values: Organize the water supply routes of each water source-reservoir-receiving water plant in the water network according to single water source-single water plant, single water source-multiple water plants, and multiple water sources-multiple water plants. The calculation method for the unit energy consumption of the water supply route of water source-reservoir-receiving water plant is as follows: Clarify the operating parameters of the pumping station units and the number of pumps on the water supply route. Calculate the operating energy consumption of the water supply line per unit time for transporting one cubic meter of water. for: ， In the formula, Let m be the power of the m-th water pump; Let m be the design flow rate of the mth water pump. Let m be the head of the m-th water pump. Let m be the efficiency of the water pump. Let be the motor efficiency of the m-th water pump; The density of water; It is the acceleration due to gravity; Step 3: Select the water supply routes with the lowest unit operating energy consumption among those with the same water source-reservoir-receiving water plant. Summarize these routes to obtain the set of water supply routes with the lowest unit operating energy consumption for each water source-reservoir-receiving water plant, thus obtaining the optimal energy consumption water supply network for the urban water supply system. Alternatively, select the water supply routes with the lowest unit operating energy consumption for a single water source-reservoir-single water plant, and then obtain the water supply routes with the lowest unit operating energy consumption for a single water source-reservoir-multiple water plant systems. Finally, summarize these routes to form the optimal energy consumption water supply network for the urban water supply system with multiple water sources-reservoirs-multiple water plant systems. Because this water supply network may have situations where some water sources cannot supply certain water plant systems, the number of routes with the lowest operating energy consumption in the water supply network is... ,Depend on The water supply lines constitute the city's optimal energy consumption water supply network: ， in, , These refer to the number of water sources and water treatment plants within the water network; Step 4: Prioritize water supply to the water supply lines with the lowest unit operating energy consumption along the water transmission route. Based on the available water supply from the water source and the water demand of the receiving water plants, formulate a water network supply scheduling plan and calculate the operating energy consumption of the urban water supply system. for: ， in, The number of water supply lines for the city's energy-efficient water supply network; For the first The operating energy consumption of a water supply line per unit time for supplying a single cubic meter of flow; For the first Water supply line flow rate; For the first The average operating time of the water pump unit on each water supply line.

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