Urban natural gas pipeline network control system and methods

Abstract

This invention provides a control system and method for urban natural gas pipeline networks. Specifically, the control system comprises: multiple natural gas pipeline branches, each branch having multiple main nodes; a main flow sensor and a main pressure sensor installed at each main node; multiple branch nodes at each main node, with each branch node ending at a user terminal; and a building control unit at each branch node, with multiple smart gas meters installed below the building control unit. This invention reduces the cost of pipeline network upgrades while regulating the gas transmission volume and pressure. By monitoring and judging the gas transmission volume, the loss rate is obtained, and based on the loss rate, leaks in specific pipeline sections can be detected.

Description

Technical Field

[0001] This application belongs to the field of natural gas pipeline technology, specifically relating to a control system and method for urban natural gas pipeline networks. Background Technology

[0002] Generally, at the user end, this phenomenon commonly occurs when users use gas: due to insufficient pressure distribution in the branch pipelines, the gas pressure at the user end is very low, which affects the user's gas usage. The pressure distribution of the branch pipelines is closely related to the number of users under each branch pipeline and the initial pressure supplied to the branch pipeline. Currently, most gas supply companies only meet the pressure distribution of the main pipelines, while the pressure distribution of the branch pipelines cannot be regulated. Summary of the Invention

[0003] In view of this, the main objective of the present invention is to provide a control system and method for urban natural gas pipeline networks.

[0004] The technical solution adopted in this invention is as follows:

[0005] This invention discloses a control system for urban natural gas pipeline networks, comprising:

[0006] Multiple natural gas pipeline branches, each with multiple pipeline main nodes;

[0007] A main flow sensor and a main pressure sensor are installed at each main node of the pipeline network;

[0008] Multiple pipeline branch nodes are set up on each pipeline main node, and the end of each pipeline branch node is the user terminal.

[0009] A building control unit is set up at each pipeline branch node, and multiple smart gas meters are set up under the building control unit. The smart gas meters are set up at the user end and are used to obtain the natural gas consumption data of the user end according to a set period, and transmit the natural gas consumption data of each user end to the building control unit.

[0010] A branch flow sensor and a branch pressure sensor are installed at each branch node of the pipeline network. The branch flow sensor and the branch pressure sensor are connected to the building control unit and transmit the branch flow signal and the branch pressure signal to the building control unit according to the set period.

[0011] The relay device is installed on each main node of the pipeline network and connected to the main flow sensor, the main pressure sensor and the building host. It is used to receive the main flow signal and the main pressure signal on the corresponding main node of the pipeline network according to a set period, and to obtain the natural gas consumption data of the user terminal sent by each building host and the branch flow signal and the branch pressure signal on each branch node of the pipeline network.

[0012] A control device, connected to a relay device, comprising: a processing module, a scheduling module, a control module, and an evaluation module;

[0013] The processing module is used to receive natural gas consumption data from the user terminals of all building main units under each relay device, and summarize them to obtain a set of gas consumption data under each relay device.

[0014] The scheduling module is connected to the processing module and is used to regulate the gas transmission volume of each natural gas pipeline branch and the node gas transmission volume of each main node of the pipeline under each natural gas pipeline branch according to the gas consumption data set.

[0015] The control module is connected to the relay equipment and is used to compare the main pressure signal of each pipeline main node with a set main pressure threshold. When the main pressure signal exceeds the set main pressure threshold, the control module controls the gas transmission pressure of each natural gas pipeline branch. The control module also compares the branch pressure signal at each pipeline branch node with a set branch pressure threshold. When the branch pressure signal exceeds the set branch pressure threshold, the control module controls the pressure distribution of multiple pipeline main nodes under each natural gas pipeline branch, so that the pressure signal measured under each pipeline main node is within the set branch pressure threshold.

[0016] The evaluation module is connected to the relay equipment and is used to perform comprehensive calculations according to a set evaluation period, based on the real-time main flow signals of all pipeline main nodes under each natural gas pipeline branch, the real-time branch flow signals of each pipeline branch node, the branch gas transmission volume of each natural gas pipeline branch, and the node gas transmission volume of each pipeline main node under each natural gas pipeline branch, in order to calculate the loss rate of each natural gas pipeline branch and each pipeline main node under each natural gas pipeline branch.

[0017] Furthermore, the building control unit has:

[0018] The data acquisition and control unit is used to send data acquisition commands to the smart gas meter according to a set cycle.

[0019] The first acquisition unit, when the smart gas meter responds to the acquisition command, is used to acquire user-side gas consumption data sent by each smart gas meter in the current cycle.

[0020] The second acquisition unit is used to acquire the flow rate and pressure signals of the branch flow sensor and the branch pressure sensor at each branch node of the pipeline network in real time.

[0021] The storage unit is used to store the user-side gas consumption data sent by each smart gas meter in each cycle acquired by the first acquisition unit, and to store the branch flow signal and branch pressure signal acquired by the second acquisition unit in real time.

[0022] The processing unit is used to collect user-side gas consumption data sent by each smart gas meter in the current cycle and the previous cycle from the storage unit, respectively, to obtain the actual user-side gas consumption data of each smart gas meter in the current cycle, and to obtain a set of natural gas consumption data for the user end based on the actual user-side gas consumption data of each smart gas meter in the current cycle.

[0023] Furthermore, the building control unit and the smart gas meter are connected in the following manner;

[0024] 1) The user performs an initialization operation on the smart gas meter. After initialization, the controller built into the smart gas meter controls the wireless radio frequency module to send access signals at the set maximum power.

[0025] 2) The building control unit obtains the access signal and processes the access signal to obtain the parameter information of the smart gas meter in the access signal. The parameter information is written into the registration module of the building control unit to complete the connection between the building control unit and the smart gas meter.

[0026] 3) The building control unit's evaluation module evaluates the strength of the access signal. When the strength of the access signal is greater than the set access strength, it calculates the difference between the strength of the access signal and the set access strength, and generates an adjustment signal based on the difference to send to the smart gas meter to regulate the transmission power of the smart gas meter's wireless radio frequency module.

[0027] Furthermore, the relay device has a built-in multi-channel acquisition unit and calibration unit;

[0028] The multi-channel acquisition unit has multiple data acquisition channels, which are used to connect to the building control unit, the main flow sensor, and the main pressure sensor, respectively.

[0029] The calibration unit is connected to the multiple data acquisition channels and is used to write the corresponding identification tags to the data acquired by the data acquisition channels.

[0030] The tag is used to calibrate the location parameters of the building control unit, the main flow sensor, and the main pressure sensor.

[0031] Furthermore, the processing module is configured to:

[0032] Multiple processing matrices are set up according to the configuration of the relay equipment. A logic control unit is configured in each processing matrix. The logic control unit receives data information according to the timing sequence and controls the output form of the data information.

[0033] In addition, a logic control unit is used as a front-end module to construct multiple processing units in each processing matrix according to the task. The processing unit is used to receive, identify and judge the corresponding data information according to the output form of the data information, so as to ensure that the processing of different data information by the same processing matrix is ​​collected by the same relay device. The processing unit is represented by the specific value of the data information.

[0034] Furthermore, the logic control unit has:

[0035] The logic control unit is used to acquire multiple data messages sent by each relay device according to the timing sequence and identify the location parameters of each data message.

[0036] The output unit is used to output the corresponding data information, and during the output, the corresponding position parameters are written to the corresponding data information terminal.

[0037] Furthermore, the logic control unit configures the activation command according to the output format of the data information;

[0038] The activation command is used to control the processing units in the processing matrix to switch from a dormant state to an active state.

[0039] The present invention also provides a method for controlling urban natural gas pipeline networks, comprising the following steps:

[0040] The natural gas pipeline network is divided into multiple branch lines according to its layout. Each branch line is further divided into multiple main nodes, and each main node into multiple branch nodes. Each branch node terminates at a user end. Each main node is equipped with a main flow sensor and a main pressure sensor. Each branch node has a building control unit, and multiple smart gas meters are installed below it. These smart gas meters are located at the user end and are used to acquire natural gas consumption data from each user at a set period, transmitting this data to the building control unit. Each branch node also has a branch flow sensor and a branch pressure sensor, which are connected to the building control unit and transmit the branch flow and pressure signals to the unit at the set period.

[0041] A relay device is set up at each main node of the pipeline network. The relay device is connected to the main flow sensor, the main pressure sensor and the building host. It is used to receive the main flow signal and the main pressure signal on the corresponding main node of the pipeline network according to a set period, and to obtain the natural gas consumption data of the user terminal sent by each building host and the branch flow signal and the branch pressure signal on each branch node of the pipeline network.

[0042] It receives natural gas consumption data from the user terminals of all building main units under each relay device and summarizes them to obtain a set of gas consumption data under each relay device; it is used to adjust the gas transmission volume of each natural gas pipeline branch and the node gas transmission volume of each pipeline main node under each natural gas pipeline branch according to the set of gas consumption data.

[0043] And / or, based on the comparison between the main pressure signal of each pipeline main node and a set main pressure threshold, when the main pressure signal exceeds the set main pressure threshold, the control module is used to control the gas transmission pressure of each natural gas pipeline branch; and the control module compares the branch pressure signal on each pipeline branch node with a set branch pressure threshold, when the branch pressure signal exceeds the set branch pressure threshold, controls the pressure distribution of multiple pipeline main nodes under each natural gas pipeline branch, so that the pressure signal measured under each pipeline main node is within the set branch pressure threshold;

[0044] And / or, according to the set evaluation period, within the evaluation period, a comprehensive calculation is performed using the real-time main flow signal on all main nodes of each natural gas pipeline branch, the real-time branch flow signal on each branch node, the branch gas transmission volume of each natural gas pipeline branch, and the node gas transmission volume of each main node of each natural gas pipeline branch, in order to calculate the loss rate of each natural gas pipeline branch and each main node of each natural gas pipeline branch.

[0045] This application constructs a pipeline control system to reduce the cost of pipeline renovation while regulating the gas transmission volume and pressure of the gas pipeline. By monitoring and judging the gas transmission volume of the pipeline, the loss rate can be obtained, and based on the loss rate, it is possible to detect which part of the pipeline is leaking.

[0046] This application leverages the widespread use of smart gas meters to regulate gas delivery based on the acquired basic data while simultaneously tracking gas consumption at the user end. Compared to traditional methods that can only regulate the gas delivery volume of branch pipelines, this application offers more precise regulation. Attached Figure Description

[0047] The following figures are for illustrative purposes only and are not intended to limit the scope of the invention.

[0048] in:

[0049] Figure 1 This is a layout diagram of the gas pipeline network according to the present invention;

[0050] Figure 2 This is a schematic diagram of the control device in this invention. Detailed Implementation

[0051] To make the objectives, technical solutions, design methods, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0052] Example 1

[0053] Reference Figures 1 to 2 This invention provides a city natural gas pipeline network control system, comprising:

[0054] Multiple natural gas pipeline branches, each with multiple pipeline main nodes;

[0055] A main flow sensor and a main pressure sensor are installed at each main node of the pipeline network;

[0056] Multiple pipeline branch nodes are set up on each pipeline main node, and the end of each pipeline branch node is the user terminal.

[0057] A building control unit is set up at each pipeline branch node, and multiple smart gas meters are set up under the building control unit. The smart gas meters are set up at the user end and are used to obtain the natural gas consumption data of the user end according to a set period, and transmit the natural gas consumption data of each user end to the building control unit.

[0058] A branch flow sensor and a branch pressure sensor are installed at each branch node of the pipeline network. The branch flow sensor and the branch pressure sensor are connected to the building control unit and transmit the branch flow signal and the branch pressure signal to the building control unit according to the set period.

[0059] The relay device is installed on each main node of the pipeline network and connected to the main flow sensor, the main pressure sensor and the building host. It is used to receive the main flow signal and the main pressure signal on the corresponding main node of the pipeline network according to a set period, and to obtain the natural gas consumption data of the user terminal sent by each building host and the branch flow signal and the branch pressure signal on each branch node of the pipeline network.

[0060] A control device, connected to a relay device, comprising: a processing module, a scheduling module, a control module, and an evaluation module;

[0061] The processing module is used to receive natural gas consumption data from the user terminals of all building main units under each relay device, and summarize them to obtain a set of gas consumption data under each relay device.

[0062] The scheduling module is connected to the processing module and is used to regulate the gas transmission volume of each natural gas pipeline branch and the node gas transmission volume of each main node of the pipeline under each natural gas pipeline branch according to the gas consumption data set.

[0063] The control module is connected to the relay equipment and is used to compare the main pressure signal of each pipeline main node with a set main pressure threshold. When the main pressure signal exceeds the set main pressure threshold, the control module controls the gas transmission pressure of each natural gas pipeline branch. The control module also compares the branch pressure signal at each pipeline branch node with a set branch pressure threshold. When the branch pressure signal exceeds the set branch pressure threshold, the control module controls the pressure distribution of multiple pipeline main nodes under each natural gas pipeline branch, so that the pressure signal measured under each pipeline main node is within the set branch pressure threshold.

[0064] The evaluation module is connected to the relay equipment and is used to perform comprehensive calculations according to a set evaluation period, based on the real-time main flow signals of all pipeline main nodes under each natural gas pipeline branch, the real-time branch flow signals of each pipeline branch node, the branch gas transmission volume of each natural gas pipeline branch, and the node gas transmission volume of each pipeline main node under each natural gas pipeline branch, in order to calculate the loss rate of each natural gas pipeline branch and each pipeline main node under each natural gas pipeline branch.

[0065] In the above, the layout of the natural gas pipeline network is divided according to the natural gas pipeline distribution lines. For example, the gas company delivers gas to various gate stations through high-pressure gas transmission pipelines. The gate station, as the starting point of the branch line distribution, receives gas from the high-pressure gas transmission pipeline, and after dust removal, metering, pressure regulation, and quality monitoring, it is input into the residential pipeline network of different areas. In this application, the high-pressure gas transmission pipeline is the natural gas pipeline branch line. The residential pipeline network from the gate station to the user end is divided into pipeline main nodes. For example, if a gate station supplies gas to two districts, the pipeline network layout of these two districts is the pipeline main node. Each district has multiple communities or residential areas. The pipeline branch nodes are the points from the pipeline main nodes to the community or residential area pipeline networks.

[0066] This application utilizes the existing pipeline network layout, requiring no modification to the pipeline network. Only branch pressure sensors and branch flow sensors need to be installed at the branch nodes, resulting in low modification costs. Its main advantage lies at the user end. For example, in some emerging areas, smart gas meter reading has been largely implemented. By leveraging the widespread use of smart gas meters, this application can regulate gas delivery based on the acquired basic data while simultaneously tracking gas consumption at the user end. Compared to traditional methods that can only regulate the gas delivery volume of branch pipelines, this application offers more precise regulation.

[0067] In the above, the building control unit has:

[0068] The data acquisition and control unit is used to send data acquisition commands to the smart gas meter according to a set cycle.

[0069] The first acquisition unit, when the smart gas meter responds to the acquisition command, is used to acquire user-side gas consumption data sent by each smart gas meter in the current cycle.

[0070] The second acquisition unit is used to acquire the flow rate and pressure signals of the branch flow sensor and the branch pressure sensor at each branch node of the pipeline network in real time.

[0071] The storage unit is used to store the user-side gas consumption data sent by each smart gas meter in each cycle acquired by the first acquisition unit, and to store the branch flow signal and branch pressure signal acquired by the second acquisition unit in real time.

[0072] The processing unit is used to collect user-side gas consumption data sent by each smart gas meter in the current cycle and the previous cycle from the storage unit, respectively, to obtain the actual user-side gas consumption data of each smart gas meter in the current cycle, and to obtain a set of natural gas consumption data for the user end based on the actual user-side gas consumption data of each smart gas meter in the current cycle.

[0073] The building control unit and the smart gas meter are connected in the following manner;

[0074] 1) The user performs an initialization operation on the smart gas meter. After initialization, the controller built into the smart gas meter controls the wireless radio frequency module to send access signals at the set maximum power.

[0075] 2) The building control unit obtains the access signal and processes the access signal to obtain the parameter information of the smart gas meter in the access signal. The parameter information is written into the registration module of the building control unit to complete the connection between the building control unit and the smart gas meter.

[0076] 3) The building control unit's evaluation module evaluates the strength of the access signal. When the strength of the access signal is greater than the set access strength, it calculates the difference between the strength of the access signal and the set access strength, and generates an adjustment signal based on the difference to send to the smart gas meter to regulate the transmission power of the smart gas meter's wireless radio frequency module.

[0077] In the above, the building control unit can be regarded as a concentrator. Its main purpose is to collect the gas consumption of the smart gas meter at the user end, as well as the flow and pressure signals of the flow and pressure sensors on the pipeline branch nodes.

[0078] When configuring the connection between the building control unit and the smart gas meter, only initialization of the smart gas meter is required on the user's end. Initialization involves triggering the wireless radio frequency (RF) module (e.g., RF4463) on the gas meter via a button. After the gas meter connects to the building control unit, the unit sends data collection commands to all connected smart gas meters at a set period (e.g., weekly, monthly). Upon receiving the command, the RF module connects its sensor to the gas meter's sensor. Whenever the smart gas meter uses a certain amount of data, the sensor emits a pulse signal, waking the sleeping RF module. The RF module records the usage and forwards it to the building control unit before returning to sleep mode. The RF module can detect the presence of data collection commands. If a command is detected, the RF module immediately enters working mode, awaiting the next command from the meter reader before executing the relevant operations.

[0079] In the above-mentioned situation, the building control unit can also record the position parameters of the flow rate sensor and the pressure sensor, or automatically write the position data of the building control unit when forwarding the flow rate signal and the pressure signal. By recording different flow rate sensors and pressure sensors, the pressure entering the user's pipeline network can be monitored. The end of the user's pipeline network directly affects the user's gas quality. When the pressure is too low, the flame at the user's end will be small due to insufficient pressure distribution, which may even affect the user's normal use.

[0080] In the above, the relay device has a built-in multi-channel acquisition unit and a calibration unit;

[0081] The multi-channel acquisition unit has multiple data acquisition channels (such as configuring an existing multi-channel acquisition module), and the multiple data acquisition channels are used to connect to the building control unit, the main flow sensor and the main pressure sensor respectively.

[0082] The calibration unit is connected to the multiple data acquisition channels and is used to write the corresponding identification tags to the data acquired by the data acquisition channels.

[0083] The tag is used to calibrate the location parameters of the building control unit, the main flow sensor, and the main pressure sensor.

[0084] In the above, the processing module is configured to:

[0085] Multiple processing matrices are set up according to the configuration of the relay equipment. A logic control unit is configured in each processing matrix. The logic control unit receives data information according to the timing sequence and controls the output form of the data information.

[0086] In addition, a logic control unit is used as a front-end module to construct multiple processing units in each processing matrix according to the task. The processing unit is used to receive, identify and judge the corresponding data information according to the output form of the data information, so as to ensure that the processing of different data information by the same processing matrix is ​​collected by the same relay device. The processing unit is represented by the specific value of the data information.

[0087] In the above, the logic control unit has:

[0088] The logic control unit is used to acquire multiple data messages sent by each relay device according to the timing sequence and identify the location parameters of each data message.

[0089] The output unit is used to output the corresponding data information, and during the output, the corresponding position parameters are written to the corresponding data information terminal.

[0090] In the above, the logic control unit configures activation instructions according to the output format of the data information; based on the activation instructions, it controls the processing units in the processing matrix to switch from a dormant state to a working state.

[0091] In the above, each relay device actually collects data forwarded by multiple building control units. Since each building control unit collects natural gas consumption data from multiple users' terminals, as well as flow rate and pressure signals from the flow rate and pressure sensors, the number of processing matrices can be configured according to the number of building control units. Each processing matrix contains at least one processing unit that independently processes the natural gas consumption data, flow rate signals, and pressure signals from the user terminals.

[0092] Since different data signals have certain differences, they need to be converted into the same form and represented by specific numerical values ​​when outputting.

[0093] Example 2

[0094] This invention also provides a method for controlling urban natural gas pipeline networks. The layout of the natural gas pipeline network is divided according to the natural gas distribution lines. For example, a gas company delivers gas to various gate stations via high-pressure gas transmission pipelines. Each gate station, as the starting point for branch line distribution, receives gas from the high-pressure gas transmission pipeline, and after dust removal, metering, pressure regulation, and quality monitoring, it is input into the residential pipeline networks of different areas. In this application, the high-pressure gas transmission pipeline is the natural gas pipeline branch line. The residential pipeline network from the gate station to the user end is divided into pipeline main nodes. For example, if one gate station supplies gas to two districts, the pipeline network layout of these two districts is the pipeline main node. Each district has multiple communities or residential areas. The branch nodes are where gas is diverted from the pipeline main node to the community or residential area pipeline network.

[0095] This application utilizes the existing pipeline network layout, requiring no modification to the pipeline network. Only branch pressure sensors and branch flow sensors need to be installed at the branch nodes, resulting in low modification costs. Its main advantage lies at the user end. For example, in some emerging areas, smart gas meter reading has been largely implemented. By leveraging the widespread use of smart gas meters, this application can regulate gas delivery based on the acquired basic data while simultaneously tracking gas consumption at the user end. Compared to traditional methods that can only regulate the gas delivery volume of branch pipelines, this application offers more precise regulation.

[0096] The above method includes: dividing the natural gas pipeline network into multiple natural gas pipeline branches according to the layout of the natural gas pipeline network; dividing each natural gas pipeline branch into multiple pipeline main nodes; dividing each pipeline main node into multiple pipeline branch nodes; and the end of each pipeline branch node is a user terminal. A main flow sensor and a main pressure sensor are installed at each pipeline main node. A building control unit is installed at each pipeline branch node, and multiple smart gas meters are installed below the building control unit. The smart gas meters are installed at the user terminal and are used to acquire natural gas consumption data from the user terminal according to a set period, and transmit the natural gas consumption data from each user terminal to the building control unit. A branch flow sensor and a branch pressure sensor are installed at each pipeline branch node. The branch flow sensor and the branch pressure sensor are connected to the building control unit and transmit the branch flow signal and the branch pressure signal to the building control unit according to the set period.

[0097] A relay device is set up at each main node of the pipeline network. The relay device is connected to the main flow sensor, the main pressure sensor and the building host. It is used to receive the main flow signal and the main pressure signal on the corresponding main node of the pipeline network according to a set period, and to obtain the natural gas consumption data of the user terminal sent by each building host and the branch flow signal and the branch pressure signal on each branch node of the pipeline network.

[0098] It receives natural gas consumption data from the user terminals of all building main units under each relay device and summarizes them to obtain a set of gas consumption data under each relay device; it is used to adjust the gas transmission volume of each natural gas pipeline branch and the node gas transmission volume of each pipeline main node under each natural gas pipeline branch according to the set of gas consumption data.

[0099] And / or, based on the comparison between the main pressure signal of each pipeline main node and a set main pressure threshold, when the main pressure signal exceeds the set main pressure threshold, the control module is used to control the gas transmission pressure of each natural gas pipeline branch; and the control module compares the branch pressure signal on each pipeline branch node with a set branch pressure threshold, when the branch pressure signal exceeds the set branch pressure threshold, controls the pressure distribution of multiple pipeline main nodes under each natural gas pipeline branch, so that the pressure signal measured under each pipeline main node is within the set branch pressure threshold;

[0100] And / or, according to a set evaluation period, within the evaluation period, a comprehensive calculation is performed using the real-time main flow signals at all main nodes of each natural gas pipeline branch, the real-time branch flow signals at each branch node, the branch gas transmission volume of each natural gas pipeline branch, and the node gas transmission volume of each main node under each natural gas pipeline branch, to calculate the loss rate of each natural gas pipeline branch and each main node under each natural gas pipeline branch. This application, by constructing a pipeline control system, reduces the cost of pipeline renovation while regulating the gas transmission volume and pressure of the gas pipeline network. By monitoring and judging the gas transmission volume of the pipeline network, the loss rate is obtained, and based on the loss rate, it is possible to detect which part of the pipeline is leaking.

[0101] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A city natural gas pipeline network control system, characterized in that, include: Multiple natural gas pipeline branches, each with multiple pipeline main nodes; A main flow sensor and a main pressure sensor are installed at each main node of the pipeline network; Multiple pipeline branch nodes are set up on each pipeline main node, and the end of each pipeline branch node is the user terminal. A building control unit is set up at each pipeline branch node, and multiple smart gas meters are set up under the building control unit. The smart gas meters are set up at the user end and are used to obtain the natural gas consumption data of the user end according to a set period, and transmit the natural gas consumption data of each user end to the building control unit. A branch flow sensor and a branch pressure sensor are installed at each branch node of the pipeline network. The branch flow sensor and the branch pressure sensor are connected to the building control unit and transmit the branch flow signal and the branch pressure signal to the building control unit according to the set period. The relay device is installed on each main node of the pipeline network and connected to the main flow sensor, the main pressure sensor and the building host. It is used to receive the main flow signal and the main pressure signal on the corresponding main node of the pipeline network according to a set period, and to obtain the natural gas consumption data of the user terminal sent by each building host and the branch flow signal and the branch pressure signal on each branch node of the pipeline network. A control device, connected to a relay device, includes a processing module, a scheduling module, a control module, and an evaluation module. The processing module receives natural gas consumption data from user terminals of all building mainframes under each relay device and aggregates the data to obtain a set of gas consumption data under each relay device. The scheduling module is connected to the processing module and is used to regulate the gas transmission volume of each natural gas pipeline branch and the node gas transmission volume of each main node of the pipeline under each natural gas pipeline branch according to the gas consumption data set. The control module is connected to the relay equipment and is used to compare the main pressure signal of each pipeline main node with the set main pressure threshold. When the main pressure signal exceeds the set main pressure threshold, the control module is used to control the gas transmission pressure of each natural gas pipeline branch. The control module compares the branch pressure signal at each pipeline branch node with the set branch pressure threshold. When the branch pressure signal exceeds the set branch pressure threshold, it controls the pressure distribution of multiple pipeline main nodes under each natural gas pipeline branch, so that the pressure signal measured under each pipeline main node is within the set branch pressure threshold. The evaluation module is connected to the relay equipment and is used to perform comprehensive calculations according to a set evaluation period, based on the real-time main flow signals of all pipeline main nodes under each natural gas pipeline branch, the real-time branch flow signals of each pipeline branch node, the branch gas transmission volume of each natural gas pipeline branch, and the node gas transmission volume of each pipeline main node under each natural gas pipeline branch, in order to calculate the loss rate of each natural gas pipeline branch and each pipeline main node under each natural gas pipeline branch.

2. The urban natural gas pipeline network control system according to claim 1, characterized in that, The building control unit has the following features: The data acquisition and control unit is used to send data acquisition commands to the smart gas meter according to a set cycle. The first acquisition unit, when the smart gas meter responds to the acquisition command, is used to acquire user-side gas consumption data sent by each smart gas meter in the current cycle. The second acquisition unit is used to acquire the flow rate and pressure signals of the branch flow sensor and the branch pressure sensor at each branch node of the pipeline network in real time. The storage unit is used to store the user-side gas consumption data sent by each smart gas meter in each cycle acquired by the first acquisition unit, and to store the branch flow signal and branch pressure signal acquired by the second acquisition unit in real time. The processing unit is used to collect user-side gas consumption data sent by each smart gas meter in the current cycle and the previous cycle from the storage unit, respectively, to obtain the actual user-side gas consumption data of each smart gas meter in the current cycle, and to obtain a set of natural gas consumption data for the user end based on the actual user-side gas consumption data of each smart gas meter in the current cycle.

3. The urban natural gas pipeline network control system according to claim 1, characterized in that, The building control unit and the smart gas meter are connected in the following manner; 1) The user performs an initialization operation on the smart gas meter. After initialization, the controller built into the smart gas meter controls the wireless radio frequency module to send access signals at the set maximum power. 2) The building control unit obtains the access signal and processes the access signal to obtain the parameter information of the smart gas meter in the access signal. The parameter information is written into the registration module of the building control unit to complete the connection between the building control unit and the smart gas meter. 3) The building control unit's evaluation module evaluates the strength of the access signal. When the strength of the access signal is greater than the set access strength, it calculates the difference between the strength of the access signal and the set access strength, and generates an adjustment signal based on the difference to send to the smart gas meter to regulate the transmission power of the smart gas meter's wireless radio frequency module.

4. The urban natural gas pipeline network control system according to claim 1, characterized in that, The relay device has a built-in multi-channel acquisition unit and calibration unit; The multi-channel acquisition unit has multiple data acquisition channels, which are used to connect to the building control unit, the main flow sensor, and the main pressure sensor, respectively. The calibration unit is connected to the multiple data acquisition channels and is used to write the corresponding identification tags to the data acquired by the data acquisition channels. The tag is used to calibrate the location parameters of the building control unit, the main flow sensor, and the main pressure sensor.

5. The urban natural gas pipeline network control system according to claim 1, characterized in that, The processing module is configured to: Multiple processing matrices are set up according to the configuration of the relay equipment. A logic control unit is configured in each processing matrix. The logic control unit receives data information according to the timing sequence and controls the output form of the data information. In addition, a logic control unit is used as a front-end module to construct multiple processing units in each processing matrix according to the task. The processing unit is used to receive, identify and judge the corresponding data information according to the output form of the data information, so as to ensure that the processing of different data information by the same processing matrix is ​​collected by the same relay device. The processing unit is represented by the specific value of the data information.

6. The urban natural gas pipeline network control system according to claim 5, characterized in that, The logic control unit has: The logic control unit is used to acquire multiple data information sent by each relay device according to the timing sequence, identify the position parameters of each data information, and output the data information accordingly. During output, the corresponding position parameters are written to the corresponding data information terminal.

7. The urban natural gas pipeline network control system according to claim 5, characterized in that... The logic control unit configures activation instructions according to the output format of the data information. The activation command is used to control the processing units in the processing matrix to switch from a dormant state to an active state.

8. A method for controlling an urban natural gas pipeline network, used in the urban natural gas pipeline network control system described in claims 1-7, characterized in that... The process includes the following steps: dividing the natural gas pipeline network into multiple natural gas pipeline branches according to the network layout; dividing each natural gas pipeline branch into multiple pipeline main nodes; dividing each pipeline main node into multiple pipeline branch nodes; and the end of each pipeline branch node is the user terminal. A main flow sensor and a main pressure sensor are installed at each pipeline main node. A building control unit is installed at each pipeline branch node, and multiple smart gas meters are installed under the building control unit. The smart gas meters are installed at the user terminal and are used to acquire natural gas consumption data from the user terminal according to a set period, and transmit the natural gas consumption data from each user terminal to the building control unit. A branch flow sensor and a branch pressure sensor are installed at each branch node of the pipeline network. The branch flow sensor and the branch pressure sensor are connected to the building control unit and transmit the branch flow signal and the branch pressure signal to the building control unit according to the set period. A relay device is set up at each main node of the pipeline network. The relay device is connected to the main flow sensor, the main pressure sensor and the building host. It is used to receive the main flow signal and the main pressure signal on the corresponding main node of the pipeline network according to a set period, and to obtain the natural gas consumption data of the user terminal sent by each building host and the branch flow signal and the branch pressure signal on each branch node of the pipeline network. The processing module receives natural gas consumption data from the user terminals of all building hosts under each relay device and summarizes it to obtain a set of gas consumption data under each relay device; the scheduling module adjusts the gas transmission volume of each natural gas pipeline branch and the node gas transmission volume of each pipeline main node under each natural gas pipeline branch according to the set of gas consumption data. The control module compares the main pressure signal of each pipeline main node with a set main pressure threshold. When the main pressure signal exceeds the set main pressure threshold, the control module controls the gas transmission pressure of each natural gas pipeline branch. The control module also compares the branch pressure signal at each pipeline branch node with a set branch pressure threshold. When the branch pressure signal exceeds the set branch pressure threshold, the control module controls the pressure distribution of multiple pipeline main nodes under each natural gas pipeline branch, so that the pressure signal measured under each pipeline main node is within the set branch pressure threshold. The evaluation module performs comprehensive calculations according to the set evaluation period, using the real-time main flow signals of all pipeline main nodes under each natural gas pipeline branch, the real-time branch flow signals of each pipeline branch node, the branch gas transmission volume of each natural gas pipeline branch, and the node gas transmission volume of each pipeline main node under each natural gas pipeline branch, to calculate the loss rate of each natural gas pipeline branch and each pipeline main node under each natural gas pipeline branch.

Images