Method for simplifying pipe network tail end topological structure of pipe network simulation system

Abstract

The invention discloses a method for simplifying a pipe network tail end topological structure of a pipe network simulation system. The method comprises the following steps: calculating pressure of each pipeline point and pressure drop of each pipeline section according to public pipeline information and self-use pipeline information; judging whether the pressure drop of each used branch pipeline section in front of the pressure regulating box is smaller than a preset first value or not, and if yes, simplifying the used branch pipeline sections respectively; and whether the total pressure drop of the self-use main pipeline is larger than a preset first value or not is judged, if yes, the self-use main pipeline and the self-use branch pipeline are simplified in a preset first simplification mode, and if not, the self-use main pipeline section and the self-use branch pipeline are simplified in a preset second simplification mode. By adopting the method, the workload can be reduced when the pipe network topology model is constructed, and the complexity of the tail end of the pipe network is reduced while the calculation precision of the model is ensured.

Description

Technical Field

[0001] The invention relates to the field of pipe network simulation, and in particular to a method for simplifying the pipe network terminal topology structure of a pipe network simulation system. Background Art

[0002] The pipe network simulation system is a key tool in the management and operation of modern urban infrastructure, and plays an important role in optimizing resource allocation, improving operational efficiency, assisting emergency response, promoting urban planning and development, and enhancing system security. When constructing the pipe network topology, the pipe network end users are mainly divided into three categories: residential users, commercial users, and industrial users. As for residential and commercial users, since these users are located in the urban area, the distribution density of users is large and complex, resulting in chaotic distribution of the voltage regulating boxes / cabinets at the end, and the structure of the pipe network end is complex, which is inconvenient for relevant personnel to view and manage. To this end, the present invention proposes a method for simplifying the pipe network end topology of the pipe network simulation system to solve the problem of complex pipe end structure mentioned above. Summary of the invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a method for simplifying the topological structure of the pipe network terminal of the pipe network simulation system, which can help reduce the workload when constructing the pipe network topology model, and reduce the complexity of the pipe network terminal while ensuring the calculation accuracy of the model.

[0004] Based on this, the present invention provides a method for simplifying the topological structure of a pipe network terminal of a pipe network simulation system, the method comprising:

[0005] Obtaining public pipeline information and private pipeline information under a branched pipeline of a single branch, wherein the private pipeline information includes private main pipeline information and private branch pipeline information;

[0006] Calculating the pressure of each pipeline point and the pressure drop of each pipeline section according to the public pipeline information and the private pipeline information;

[0007] Determine whether the pressure drop of each branch pipeline section before the pressure regulating box is less than a preset first value, and if so, simplify the branch pipeline sections respectively;

[0008] Determine whether the total pressure drop of the self-use main pipeline is greater than the preset first value. If so, use a preset first simplification method to simplify the self-use main pipeline and the self-use branch pipeline. If not, use a preset second simplification method to simplify the self-use main pipeline section and the self-use branch pipeline.

[0009] Among them, the first simplification method includes: calculating the pressure drop ratio of each of the self-use main pipeline sections to the total pressure drop, simplifying the self-use main pipeline section and the self-use branch pipeline section in sequence according to the pressure drop ratio according to preset simplification rules to obtain a simplified pipeline, and judging whether the simplification is successful based on the pressure change before and after the simplification of the pressure regulating box. If not, the simplified pipeline is restored to its original state.

[0010] Wherein, simplifying the self-use main pipeline section and the self-use branch pipeline section in sequence according to the pressure drop proportion value according to the preset simplification rules to obtain a simplified pipeline includes:

[0011] The pressure drop percentage values ​​are sorted in order of magnitude, and the self-use main pipeline section and the self-use branch pipeline section corresponding to the smallest pressure drop percentage value are simplified;

[0012] If the pressure drop ratio is the same and the smallest, the self-use main pipeline section and the self-use branch pipeline section farthest from the public pipeline are simplified.

[0013] Wherein, simplifying the self-use main pipeline section and the self-use branch pipeline section to obtain a simplified pipeline includes:

[0014] The simplified pipeline is obtained by removing the self-use branch pipeline section connected to the pressure regulating box and the self-use main pipeline section connected to the self-use branch pipeline section, and directly connecting the pressure regulating box to the adjacent previous pipeline point on the self-use main pipeline.

[0015] Wherein, judging whether the simplification is established according to the pressure change of the pressure regulating box before and after the simplification includes:

[0016] It is determined whether the value obtained by dividing the pressure of the pressure regulating box before simplification by the pressure after simplification is greater than a preset second value. If so, the simplification is established; if not, the simplification is not established. The preset second value is 95%.

[0017] Wherein, the adopting of the preset second simplification method to simplify the self-use main pipeline section and the self-use branch pipeline includes:

[0018] The self-use main pipeline is removed, and the end of the public pipeline is directly connected to each of the pressure regulating boxes.

[0019] Wherein, the method further comprises:

[0020] When the branch pipeline includes at least two branches, and the pressure drops of the self-use branch pipeline section and each of the self-use main pipelines are less than the preset first value, the self-use main pipeline is removed, and each of the pressure regulating boxes is directly connected to the end of the common pipeline by a pipeline, and the preset first value is set to 0.02MPa.

[0021] Among them, if the pressure drops of the self-use branch pipeline segments and each of the self-use main pipelines are not all less than the preset first value, the branch pipelines with multiple branches are regarded as the branch pipelines with multiple single branches to simplify the pipelines.

[0022] The public pipeline information and the private pipeline information both include: pipe diameter, pipe network temperature, pipeline length, absolute roughness of the inner wall of the pipeline, and hourly flow rate.

[0023] Calculating the pressure of each pipeline point according to the public pipeline information and the private pipeline information includes:

[0024] The pressure of each pipeline point is obtained by a preset formula, and the preset formula includes:

[0025]

[0026] Wherein, p1 is the starting pressure of the pipeline, p2 is the end pressure of the pipeline, Z is the preset compression factor, which is 1 in the medium pressure pipeline, L is the length of the pipeline, λ is the preset pipeline friction coefficient, k is the absolute roughness of the inner wall of the pipeline, d is the inner diameter of the pipeline, Q is the hourly flow rate, ρ is the preset natural gas density, and R e is the preset Reynolds number, T is the pipe network temperature, and T0 is the Kelvin temperature, which is 273.15K.

[0027] According to the present invention, first, the public pipeline information and the self-use pipeline information under the branch pipeline of a single branch are obtained, and the self-use pipeline information includes the self-use main pipeline information and the self-use branch pipeline information. This is the data basis for subsequent analysis. The pressure of each pipeline point and the pressure drop of each pipeline section are calculated according to the public pipeline information and the self-use pipeline information. Obtaining the pressure drop is used to determine whether pipeline simplification is required. Determine whether the pressure drop of each branch pipeline section before the pressure regulating box is less than the preset first value. If so, simplify the self-use branch pipeline section and the self-use main pipeline section connected to the self-use branch pipeline section respectively; determine whether the total pressure drop of the self-use main pipeline is greater than the preset first value. If so, use the preset first simplification method to simplify the self-use main pipeline and the self-use branch pipeline. If not, use the preset second simplification method to simplify the self-use main pipeline section and the self-use branch pipeline. Here, corresponding simplifications are performed according to different situations. The present invention can help reduce the workload when constructing a pipe network topology model, and reduce the complexity of the pipe network terminal while ensuring the calculation accuracy of the model. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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 or the description of the prior art 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.

[0029] Figure 1 It is a flow chart of a method for simplifying the topological structure of a pipe network terminal of a pipe network simulation system provided by an embodiment of the present invention;

[0030] Figure 2 It is a schematic diagram of the topological structure of a pipe network terminal of a pipe network simulation system provided by an embodiment of the present invention;

[0031] Figure 3 is a simplified schematic diagram of the self-use branch pipeline section provided by an embodiment of the present invention;

[0032] Figure 4 is a schematic diagram of a simplified pipeline provided by an embodiment of the present invention;

[0033] Figure 5 It is a schematic diagram of a pressure regulating box provided in an embodiment of the present invention being directly connected to the end of the common pipeline through a pipeline. DETAILED DESCRIPTION

[0034] The following will be combined with the 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 without creative work are within the scope of protection of the present invention.

[0035] Figure 1 : is a flowchart of a method for simplifying the topological structure of a pipe network terminal of a pipe network simulation system provided by an embodiment of the present invention, the method comprising:

[0036] S101. Obtaining public pipeline information and private pipeline information under a branched pipeline of a single branch, wherein the private pipeline information includes private main pipeline information and private branch pipeline information.

[0037] The public pipeline information and the private pipeline information both include: pipe diameter, pipe network temperature, pipeline length, absolute roughness of the inner wall of the pipeline, and hourly flow rate.

[0038] The main purpose of obtaining the public pipeline information and the private pipeline information is to calculate the pressure drop of each pipeline section.

[0039] Figure 2It is a schematic diagram of the pipe network terminal topology structure of the pipe network simulation system provided in an embodiment of the present invention, wherein 201 represents the municipal gas main pipeline, 202 represents the public pipeline, 203 represents the self-use main pipeline, 204 represents the self-use branch pipeline, 205 represents the pressure regulating box, G1 to G7 represent pipeline points, G1-G2, G2-G3, G3-G4, G4-G5, G6-G7 are the pipeline sections.

[0040] Figure 2 The terminal topological structure information of the pipeline network can be obtained through the gas GIS system.

[0041] S102. Calculate the pressure of each pipeline point and the pressure drop of each pipeline section according to the public pipeline information and the private pipeline information.

[0042] Calculating the pressure of each pipeline point according to the public pipeline information and the private pipeline information includes:

[0043] The pressure of each pipeline point is obtained by a preset formula, and the preset formula includes:

[0044]

[0045] Wherein, p1 is the starting pressure of the pipeline, p2 is the end pressure of the pipeline, Z is the preset compression factor, which is 1 in the medium pressure pipeline, L is the preset pipeline length, λ is the preset pipeline friction coefficient, k is the preset absolute roughness of the inner wall of the pipeline, d is the preset inner diameter of the pipeline, Q is the hourly flow rate, ρ is the preset natural gas density, and R e is a preset Reynolds number, T is a preset or known pipe network temperature, and T0 is a Kelvin temperature, which is 273.15K.

[0046] The hourly flow rate can be obtained by remote transmission through a flow meter installed in the pipeline.

[0047] The calculation formula of the Reynolds number is: e =ρvd / u, where ρ is the preset gas density, v is the preset gas velocity, and d is the preset pipe inner diameter.

[0048] The starting point pressure P1 can be preset.

[0049] After the pressure at each pipeline point is obtained, the absolute value of the difference between the pressures at two adjacent pipeline points is the pressure drop of the pipeline section.

[0050] S103. Determine whether the pressure drop of each branch pipeline section before the pressure regulating box is less than a preset first value. If so, simplify the branch pipeline sections respectively.

[0051] Figure 3This is a simplified schematic diagram of the self-use branch pipeline section provided in an embodiment of the present invention. Please refer to Figure 3 That is to say, the self-use branch pipeline section in front of the pressure regulating box is removed and directly connected to the self-use main pipeline.

[0052] If the pressure drop of each branch pipeline section before the pressure regulating box is not less than a preset first value, the branch pipeline section will not be simplified.

[0053] S104. Determine whether the total pressure drop of the self-use main pipeline is greater than the preset first value. If so, use the preset first simplification method to simplify the self-use main pipeline and the self-use branch pipeline. If not, use the preset second simplification method to simplify the self-use main pipeline section and the self-use branch pipeline.

[0054] The first simplification method includes: calculating the pressure drop ratio of each of the self-use main pipeline sections to the total pressure drop, simplifying the self-use main pipeline sections and the self-use branch pipeline sections in sequence according to the pressure drop ratios according to preset simplification rules to obtain a simplified pipeline, and judging whether the simplification is successful based on the pressure change before and after the simplification of the pressure regulating box. If not, the simplified pipeline is restored to its original state.

[0055] Wherein, simplifying the self-use main pipeline section and the self-use branch pipeline section in sequence according to the pressure drop proportion value according to the preset simplification rules to obtain a simplified pipeline includes:

[0056] The pressure drop percentage values ​​are sorted in order of magnitude, and the self-use main pipeline section and the self-use branch pipeline section corresponding to the smallest pressure drop percentage value are simplified;

[0057] If the pressure drop ratio is the same and the smallest, the self-use main pipeline section and the self-use branch pipeline section farthest from the public pipeline are simplified.

[0058] That is to say, the main pipeline section for self-use and the branch pipeline section for self-use are simplified in sequence, and the main pipeline section for self-use and the branch pipeline section for self-use corresponding to the smallest pressure drop ratio are simplified first. If the pressure drop ratios are the same and the smallest, the main pipeline section for self-use and the branch pipeline section for self-use farthest from the public pipeline are simplified. Then the main pipeline section for self-use and the branch pipeline section for self-use corresponding to the second smallest pressure drop ratio are simplified, and then the main pipeline section for self-use and the branch pipeline section for self-use corresponding to the third smallest pressure drop ratio are simplified, and so on.

[0059] Wherein, simplifying the self-use main pipeline section and the self-use branch pipeline section to obtain a simplified pipeline includes:

[0060] The simplified pipeline is obtained by removing the self-use branch pipeline section connected to the pressure regulating box and the self-use main pipeline section connected to the self-use branch pipeline section, and directly connecting the pressure regulating box to the adjacent previous pipeline point on the self-use main pipeline. Figure 4 This is a schematic diagram of a simplified pipeline provided by an embodiment of the present invention. Please refer to Figure 4 .

[0061] Wherein, judging whether the simplification is established according to the pressure change of the pressure regulating box before and after the simplification includes:

[0062] It is determined whether the value obtained by dividing the pressure of the pressure regulating box before simplification by the pressure after simplification is greater than a preset second value. If so, the simplification is established; if not, the simplification is not established. The preset second value is 95%.

[0063] Wherein, the adopting of the preset second simplification method to simplify the self-use main pipeline section and the self-use branch pipeline includes:

[0064] The self-use main pipeline is removed, and the end of the public pipeline is directly connected to each of the pressure regulating boxes.

[0065] It should be noted that the calculation accuracy required for the end of the gas pipeline network should not be less than 95%. For the medium-pressure pipeline with a pressure of 0.2MPa, the error is 0.02MPa, and the error of the simplified pipeline network is controlled within the accuracy requirement.

[0066] Wherein, the method further comprises:

[0067] When the branch pipeline includes at least two branches, when the pressure drops of the self-use branch pipeline section and each of the self-use main pipelines are less than the preset first value, the self-use main pipeline is removed, and each of the pressure regulating boxes is directly connected to the end of the public pipeline. The preset first value is set to 0.02MPa. Figure 5 This is a schematic diagram of a pressure regulating box provided in an embodiment of the present invention directly connected to the end of the common pipeline by a pipeline, please refer to Figure 5 .

[0068] Among them, if the pressure drops of the self-use branch pipeline segments and each of the self-use main pipelines are not all less than the preset first value, the multi-branch branch pipelines are regarded as multiple single-branch branch pipelines to simplify the pipelines, and the above-mentioned single-branch branch pipeline simplification process is repeated.

[0069] According to the present invention, first, the public pipeline information and the self-use pipeline information under the branch pipeline of a single branch are obtained, and the self-use pipeline information includes the self-use main pipeline information and the self-use branch pipeline information. This is the data basis for subsequent analysis. The pressure of each pipeline point and the pressure drop of each pipeline section are calculated according to the public pipeline information and the self-use pipeline information. Obtaining the pressure drop is used to determine whether pipeline simplification is required. Determine whether the pressure drop of each branch pipeline section before the pressure regulating box is less than the preset first value. If so, simplify the self-use branch pipeline section and the self-use main pipeline section connected to the self-use branch pipeline section respectively; determine whether the total pressure drop of the self-use main pipeline is greater than the preset first value. If so, use the preset first simplification method to simplify the self-use main pipeline and the self-use branch pipeline. If not, use the preset second simplification method to simplify the self-use main pipeline section and the self-use branch pipeline. Here, corresponding simplifications are performed according to different situations. The present invention can help reduce the workload when constructing a pipe network topology model, and reduce the complexity of the pipe network terminal while ensuring the calculation accuracy of the model.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for simplifying the topological structure of a pipe network terminal of a pipe network simulation system, characterized in that: include: Obtaining public pipeline information and private pipeline information under a branched pipeline of a single branch, wherein the private pipeline information includes private main pipeline information and private branch pipeline information; Calculating the pressure of each pipeline point and the pressure drop of each pipeline section according to the public pipeline information and the private pipeline information; Determine whether the pressure drop of each branch pipeline section before the pressure regulating box is less than a preset first value, and if so, simplify the branch pipeline sections respectively; Determine whether the total pressure drop of the self-use main pipeline is greater than the preset first value. If so, use a preset first simplification method to simplify the self-use main pipeline and the self-use branch pipeline. If not, use a preset second simplification method to simplify the self-use main pipeline section and the self-use branch pipeline.

2. The method for simplifying the pipe network terminal topology structure of the pipe network simulation system according to claim 1, characterized in that: The first simplification method includes: calculating the pressure drop ratio of each of the self-use main pipeline sections to the total pressure drop, simplifying the self-use main pipeline sections and the self-use branch pipeline sections in sequence according to the pressure drop ratios according to preset simplification rules to obtain a simplified pipeline, and judging whether the simplification is successful based on the pressure change before and after the simplification of the pressure regulating box. If not, the simplified pipeline is restored to its original state.

3. The method for simplifying the pipe network terminal topology structure of the pipe network simulation system according to claim 2, characterized in that: According to the pressure drop ratio, the self-use main pipeline section and the self-use branch pipeline section are simplified in sequence according to the preset simplification rules to obtain a simplified pipeline including: The pressure drop percentage values ​​are sorted in order of magnitude, and the self-use main pipeline section and the self-use branch pipeline section corresponding to the smallest pressure drop percentage value are simplified; If the pressure drop ratio is the same and the smallest, the self-use main pipeline section and the self-use branch pipeline section farthest from the public pipeline are simplified.

4. The method for simplifying the pipe network terminal topology structure of the pipe network simulation system according to claim 2, characterized in that: The simplified pipeline obtained by simplifying the self-use main pipeline section and the self-use branch pipeline section includes: The simplified pipeline is obtained by removing the self-use branch pipeline section connected to the pressure regulating box and the self-use main pipeline section connected to the self-use branch pipeline section, and directly connecting the pressure regulating box to the adjacent previous pipeline point on the self-use main pipeline.

5. The method for simplifying the pipe network terminal topology structure of the pipe network simulation system according to claim 2, characterized in that: Judging whether the simplification is established according to the pressure change of the pressure regulating box before and after simplification includes: It is determined whether the value obtained by dividing the pressure of the pressure regulating box before simplification by the pressure after simplification is greater than a preset second value. If so, the simplification is established; if not, the simplification is not established. The preset second value is 95%.

6. The method for simplifying the topological structure of the pipe network terminal of the pipe network simulation system according to claim 1, characterized in that: The adopting of the preset second simplification method to simplify the self-use main pipeline section and the self-use branch pipeline includes: The self-use main pipeline is removed, and the end of the public pipeline is directly connected to each of the pressure regulating boxes.

7. The method for simplifying the topological structure of the pipe network terminal of the pipe network simulation system according to claim 1, characterized in that: The method further comprises: When the branch pipeline includes at least two branches, and the pressure drops of the self-use branch pipeline section and each of the self-use main pipelines are less than the preset first value, the self-use main pipeline is removed, and each of the pressure regulating boxes is directly connected to the end of the common pipeline by a pipeline, and the preset first value is set to 0.02MPa.

8. The method for simplifying the topological structure of the pipe network terminal of the pipe network simulation system according to claim 7, characterized in that: If the pressure drops of the self-use branch pipeline segments and the self-use main pipelines are not all less than the preset first value, the branch pipelines with multiple branches are regarded as multiple single-branch branch pipelines to simplify the pipelines.

9. The method for simplifying the pipe network terminal topology structure of the pipe network simulation system according to claim 1, characterized in that: The public pipeline information and the private pipeline information both include: pipe diameter, pipe network temperature, pipeline length, absolute roughness of the inner wall of the pipeline, and hourly flow rate.

10. The method for simplifying the pipe network terminal topology structure of the pipe network simulation system according to claim 1, characterized in that: Calculating the pressure of each pipeline point according to the public pipeline information and the private pipeline information includes: The pressure of each pipeline point is obtained by a preset formula, and the preset formula includes: Wherein, p1 is the starting pressure of the preset pipeline, p2 is the end pressure of the pipeline, Z is the preset compression factor, which is 1 in the medium pressure pipeline, L is the preset pipeline length, λ is the preset pipeline friction coefficient, k is the preset pipeline inner wall absolute roughness, d is the preset pipeline inner diameter, Q is the hourly flow rate, ρ is the preset natural gas density, and R e is the preset Reynolds number, T is the preset pipe network temperature, and T0 is the Kelvin temperature, which is 273.15K.

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