Power distribution network line temperature monitoring system

Abstract

The invention belongs to the technical field of power distribution line management systems, and particularly relates to a power distribution network line temperature monitoring system. Comprising a sensing layer, a network layer, a platform layer and an application layer. The sensing layer is composed of terminal nodes, the network layer is composed of information nodes, and the information nodes and the terminal nodes form a star topology network; the platform layer is composed of a cloud center and a cloud database, the cloud center completes data analysis work and then transfers temperature data to the cloud database according to a rule engine, remote storage of the temperature data is completed, meanwhile, a public network interface of the cloud database is released, and access of the application layer is facilitated; a distribution line state monitoring system visualization platform of a B / S architecture is designed in the application layer. The power distribution network line temperature monitoring system provided by the invention is simple in structure, high in data transmission efficiency and capable of better realizing power distribution network monitoring.

Description

Technical Field

[0001] The invention belongs to the technical field of distribution line management systems, and in particular relates to a distribution network line temperature monitoring system. Background Art

[0002] Smart grid is a new type of power network formed by highly integrating modern sensor measurement technology, communication technology, information technology and computer control technology into all aspects of the power system. With the rapid popularization and promotion of sensor technology and wireless communication technology in my country, the existing methods usually use the bridge method to measure the voltage in the platinum resistance sensing circuit to indirectly measure the line temperature based on the characteristic that the current carrying capacity corresponding to the temperature rise of the same overhead transmission line in different environments is roughly the same, and the current carrying capacity corresponding to the temperature rise increment of the same overhead transmission line decreases with the increase of the temperature rise of the overhead transmission line. However, this temperature measurement method will increase the difficulty of developing monitoring devices. Summary of the invention

[0003] The object of the present invention is to provide a distribution network line temperature monitoring system which has a simple structure, high data transmission efficiency and can better realize distribution network monitoring.

[0004] To achieve the above purpose, the present invention adopts the following technical solution.

[0005] A distribution network line temperature monitoring system, comprising a perception layer, a network layer, a platform layer, and an application layer;

[0006] The perception layer is composed of multiple terminal nodes, which are deployed at the line connection points to be monitored to obtain temperature data in real time and send the temperature data to the information nodes in the network layer through the wireless network;

[0007] The network layer is composed of multiple information nodes. A single information node and multiple terminal nodes form a star topology network. The information node can control the networking of all subordinate terminal nodes. In order to avoid data crosstalk in the internal network, adjacent internal networks use communication channels of different frequencies. A certain number of information nodes and terminal nodes are configured according to the actual needs of the site to cover all temperature measurement points in a certain area of ​​the distribution line.

[0008] The platform layer is composed of the cloud center and the cloud database. After the information node receives the temperature data uploaded by the perception layer, it reports it to the cloud center in real time through the LTE network. After the cloud center completes the data analysis, it transfers the temperature data to the cloud database according to the rule engine, completing the remote storage of the temperature data and releasing the public network interface of the cloud database to facilitate the access of the application layer.

[0009] A visualization platform for the distribution line status monitoring system with a B / S architecture is designed in the application layer to realize functions such as visualization display of monitoring data, over-limit alarm, and historical data backtracking. At the same time, the node temperature prediction model is studied, the changing rules of historical data are mined, and the future trend of node temperature is deduced to realize short-term prediction of node temperature.

[0010] A further improvement or preferred implementation of the aforementioned distribution network line temperature monitoring system, the terminal node includes a power module, a main control chip, an infrared temperature sensor, a data communication module, and the power supply scheme of the power module is a lithium battery + solar panel combined power supply. The main control chip of the terminal node is combined with the minimum system peripheral circuit to form the control center of the terminal node. The main tasks of the main control chip are: ① transmission and analysis of networking data frames; ② control of infrared temperature sensors for data collection; ③ packaging and transmission of temperature data; ④ control of the working indication circuit to display the current working status of the terminal node.

[0011] The initialization module completes the pin initialization operation, enables each clock bus, and configures the pin working mode;

[0012] The data communication module participates in establishing a star topology wireless network between the terminal node and the information node; after the terminal node is powered on, the parameter register of the communication module is configured, wherein the frequency band is kept consistent with the information node in the current star network for data exchange, and the address is configured in sequence according to the terminal node serial number in the current star network;

[0013] Whether it is a terminal node or an information node, when receiving data, it will first determine whether it is a complete data frame based on the frame header and frame tail. The types of uplink data include network access request and network access response, which are distinguished by identifiers. After the terminal node receives the network access broadcast instruction, the wireless communication module enters the fixed-point transmission mode, and all terminal nodes reply to the information node with the network access request instruction in turn. The information node polls each terminal node in order of address. The terminal node that receives the polling instruction immediately replies with the response instruction. At this time, the terminal node successfully accesses the network and enters the low-power mode. During this period, the wireless communication module will enter the sleep-listening cycle working state;

[0014] The temperature acquisition module continuously reads the temperature data and calculates the average value, and transmits the temperature data frame to the information node through the data communication module. At the same time, the terminal node enters the low power consumption mode and waits for the next round of acquisition cycle.

[0015] A further improvement or preferred implementation of the above-mentioned distribution network line temperature monitoring system, wherein the information node includes a power supply module, a main control chip, a storage module, a wireless communication module, and an LTE data transmission radio;

[0016] The power supply modules respectively provide power for the LTE data transmission radio, wireless communication module and main control chip;

[0017] The main functions of the main control chip of the information node are: ① transmission and analysis of networking data frames; ② command control of LTE data transmission radio; ③ control of data storage of storage module; ④ reception and analysis of temperature data frames; ⑤ control of working indication circuit to display the current working status of the information node.

[0018] When networking with terminal nodes, the information node will register the terminal node's address, channel and node number. The information node will poll the terminal node in the subsequent networking process based on this information. The storage module plays a role in data storage during the networking process.

[0019] The wireless communication module executes networking data communication, issues network access broadcast, network access polling and wake-up instructions. When the information node executes the networking process, it first broadcasts network access to the current frequency band and opens a time window to wait for the terminal node to send a network access request data frame. During this time window, each time a network access request data frame is received, the address and channel of the terminal node in the frame will be extracted and written into the storage module. In order to ensure that all terminal nodes can successfully join the network, when the time window ends, the information node will compare the number of received network access request data frames with the pre-set number of terminal nodes. If the former is less than the latter, it means that a terminal node has not received the network access broadcast instruction. At this time, the information node will resend the broadcast instruction. When the upper limit of the number of retransmissions is reached and the number is still less, it means that a terminal node has died. After the flag bit is updated, the polling process of checking the serial number of the dead node is entered. If the two are equal, the information node will send network access polling data frames in sequence according to the serial number of the terminal node. After the polling is completed, the timer is started, and the wake-up instruction is periodically broadcast to wake up the terminal node to collect temperature.

[0020] After receiving the temperature data frame, the information node first performs a sum check on it and compares it with the check code in the data frame. When the results are consistent, the internal temperature data is extracted and encapsulated in the corresponding position in the information node cloud center data frame. After completing the encapsulation of all temperature data, it is reported to the platform layer through the LTE data transmission radio; the LTE data transmission radio is responsible for establishing a data link with the platform layer, using two serial interfaces, RS485 and RS232, for communication.

[0021] For further improvement or preferred implementation of the above-mentioned distribution network line temperature monitoring system, the cloud center creates a custom interface named remote monitoring of contact temperature in the interface list. The interface is directly connected to the Internet of Things platform through the network in a custom data format. After the interface is created, a virtual device corresponding to the information node is created inside the interface; after the virtual device representing the information node is created, a physical model of the terminal node is added to the virtual device. The physical model is a data model that integrates attributes, events, and services. It is an attribute mapping of each terminal node in the cloud center, and the attribute is the temperature number collected by the terminal node; the cloud database realizes remote storage of temperature data and access and reading by multiple clients.

[0022] A further improvement or preferred implementation of the above-mentioned distribution network line temperature monitoring system, the data transmitted by the wireless network includes networking data and temperature data;

[0023] The terminal nodes and information nodes establish the internal network autonomously through two-way interaction of data frames. The networking data is classified into uplink data and downlink data according to the direction of data flow. Uplink data is sent from the terminal node to the information node, and downlink data is sent from the information node to the terminal node. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of a temperature monitoring system for distribution network lines;

[0025] Figure 2 is a schematic diagram of a terminal node. DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with specific embodiments.

[0027] The present invention provides a distribution network line temperature monitoring system which has a simple structure, high data transmission efficiency and can better realize distribution network monitoring.

[0028] like Figure 1 , Figure 2 As shown, it mainly includes perception layer, network layer, platform layer and application layer

[0029] The perception layer is composed of multiple terminal nodes, which are deployed at the line connection points to be monitored to obtain temperature data in real time and send the temperature data to the information nodes in the network layer through the wireless network;

[0030] The network layer is composed of multiple information nodes. A single information node and multiple terminal nodes form a star topology network. The information node can control the networking of all subordinate terminal nodes. In order to avoid data crosstalk in the internal network, adjacent internal networks use communication channels of different frequencies. A certain number of information nodes and terminal nodes are configured according to the actual needs of the site to cover all temperature measurement points in a certain area of ​​the distribution line.

[0031] The platform layer is composed of the cloud center and the cloud database. After the information node receives the temperature data uploaded by the perception layer, it reports it to the cloud center in real time through the LTE network. After the cloud center completes the data analysis, it transfers the temperature data to the cloud database according to the rule engine, completing the remote storage of the temperature data and releasing the public network interface of the cloud database to facilitate the access of the application layer.

[0032] A visualization platform for the distribution line status monitoring system with a B / S architecture is designed in the application layer to realize functions such as visualization display of monitoring data, over-limit alarm, and historical data backtracking. At the same time, the node temperature prediction model is studied, the changing rules of historical data are mined, and the future trend of node temperature is deduced to realize short-term prediction of node temperature.

[0033] The data transmitted by the wireless network includes networking data and temperature data;

[0034] The terminal node and the information node realize the autonomous establishment of the internal network through the two-way interaction of data frames. The networking data is classified into uplink data and downlink data according to the data flow direction; the uplink data is sent from the terminal node to the information node, and the downlink data is sent from the information node to the terminal node;

[0035] The terminal node includes a power module, a main control chip, an infrared temperature sensor, a data communication module,

[0036] The power supply scheme of the power module is a combination of lithium battery + solar panel. The main control chip of the terminal node and the minimum system peripheral circuit together constitute the control center of the terminal node. The main tasks of the main control chip are: ① Transmission and analysis of networking data frames; ② Control infrared temperature sensors for data collection; ③ Packaging and transmission of temperature data; ④ Control the working indication circuit to display the current working status of the terminal node.

[0037] The initialization module completes the pin initialization operation, enables each clock bus, and configures the pin working mode;

[0038] The data communication module participates in establishing a star topology wireless network between the terminal node and the information node; after the terminal node is powered on, the parameter register of the communication module is configured, wherein the frequency band is kept consistent with the information node in the current star network for data exchange, and the address is configured in sequence according to the terminal node serial number in the current star network;

[0039] Whether it is a terminal node or an information node, when receiving data, it will first determine whether it is a complete data frame based on the frame header and frame tail. The types of uplink data include network access request and network access response, which are distinguished by identifiers. After the terminal node receives the network access broadcast instruction, the wireless communication module enters the fixed-point transmission mode, and all terminal nodes reply to the information node with the network access request instruction in turn. The information node polls each terminal node in order of address. The terminal node that receives the polling instruction immediately replies with the response instruction. At this time, the terminal node successfully accesses the network and enters the low-power mode. During this period, the wireless communication module will enter the sleep-listening cycle working state;

[0040] The temperature acquisition module continuously reads the temperature data and calculates the average value, and transmits the temperature data frame to the information node through the data communication module. At the same time, the terminal node enters the low power consumption mode and waits for the next round of acquisition cycle;

[0041] The information node includes a power supply module, a main control chip, a storage module, a wireless communication module, and an LTE data transmission radio;

[0042] The power supply modules respectively provide power for the LTE data transmission radio, wireless communication module and main control chip;

[0043] The main functions of the main control chip of the information node are: ① transmission and analysis of networking data frames; ② command control of LTE data transmission radio; ③ control of data storage of storage module; ④ reception and analysis of temperature data frames; ⑤ control of working indication circuit to display the current working status of the information node.

[0044] When networking with terminal nodes, the information node will register the terminal node's address, channel and node number. The information node will poll the terminal node in the subsequent networking process based on this information. The storage module plays a role in data storage during the networking process.

[0045] The wireless communication module executes networking data communication, issues network access broadcast, network access polling and wake-up instructions. When the information node executes the networking process, it first broadcasts network access to the current frequency band and opens a time window to wait for the terminal node to send a network access request data frame. During this time window, each time a network access request data frame is received, the address and channel of the terminal node in the frame will be extracted and written into the storage module. In order to ensure that all terminal nodes can successfully join the network, when the time window ends, the information node will compare the number of received network access request data frames with the pre-set number of terminal nodes. If the former is less than the latter, it means that a terminal node has not received the network access broadcast instruction. At this time, the information node will resend the broadcast instruction. When the upper limit of the number of retransmissions is reached and the number is still less, it means that a terminal node has died. After the flag bit is updated, the polling process of checking the serial number of the dead node is entered. If the two are equal, the information node will send network access polling data frames in sequence according to the serial number of the terminal node. After the polling is completed, the timer is started, and the wake-up instruction is periodically broadcast to wake up the terminal node to collect temperature.

[0046] After receiving the temperature data frame, the information node first performs a sum check and compares it with the check code in the data frame. When the results are consistent, the internal temperature data is extracted and encapsulated in the corresponding position in the information node cloud center data frame. After completing the encapsulation of all temperature data, it is reported to the platform layer through the LTE data transmission radio; the LTE data transmission radio is responsible for establishing a data link with the platform layer, using two serial interfaces, RS485 and RS232, for communication;

[0047] The cloud center creates a custom interface named remote monitoring of contact temperature in the interface list. The interface is directly connected to the Internet of Things platform through the network in a custom data format. After the interface is created, a virtual device corresponding to the information node is created inside the interface. After the virtual device representing the information node is created, the object model of the terminal node is added to the virtual device. The object model is a data model that integrates attributes, events, and services. It is the attribute mapping of each terminal node in the cloud center. The attribute is the temperature number collected by the terminal node; the cloud database realizes remote storage of temperature data and access and reading by multiple clients.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A distribution network line temperature monitoring system, characterized in that: Including perception layer, network layer, platform layer, and application layer; The perception layer is composed of multiple terminal nodes, which are deployed at the line connection points to be monitored to obtain temperature data in real time and send the temperature data to the information nodes in the network layer through the wireless network; The network layer is composed of multiple information nodes. A single information node and multiple terminal nodes form a star topology network. The information node can control the networking of all subordinate terminal nodes. In order to avoid data crosstalk in the internal network, adjacent internal networks use communication channels of different frequencies. A certain number of information nodes and terminal nodes are configured according to the actual needs of the site to cover all temperature measurement points in a certain area of ​​the distribution line. The platform layer is composed of the cloud center and the cloud database. After the information node receives the temperature data uploaded by the perception layer, it reports it to the cloud center in real time through the LTE network. After the cloud center completes the data analysis, it transfers the temperature data to the cloud database according to the rule engine, completing the remote storage of the temperature data and releasing the public network interface of the cloud database to facilitate the access of the application layer. A visualization platform for the distribution line status monitoring system with a B / S architecture is designed in the application layer to realize functions such as visualization display of monitoring data, over-limit alarm, and historical data backtracking. At the same time, the node temperature prediction model is studied, the changing rules of historical data are mined, and the future trend of node temperature is deduced to realize short-term prediction of node temperature.

2. The distribution network line temperature monitoring system according to claim 1, characterized in that: The terminal node includes a power module, a main control chip, an infrared temperature sensor, a data communication module, The power supply scheme of the power module is a combination of lithium battery + solar panel. The main control chip of the terminal node and the minimum system peripheral circuit together constitute the control center of the terminal node. The main tasks of the main control chip are: ① Transmission and analysis of networking data frames; ② Control infrared temperature sensors for data collection; ③ Packaging and transmission of temperature data; ④ Control the working indication circuit to display the current working status of the terminal node. The initialization module completes the pin initialization operation, enables each clock bus, and configures the pin working mode; The data communication module participates in establishing a star topology wireless network between the terminal node and the information node; after the terminal node is powered on, the parameter register of the communication module is configured, wherein the frequency band is kept consistent with the information node in the current star network for data exchange, and the address is configured in sequence according to the terminal node serial number in the current star network; Whether it is a terminal node or an information node, when receiving data, it will first determine whether it is a complete data frame based on the frame header and frame tail. The types of uplink data include network access request and network access response, which are distinguished by identifiers. After the terminal node receives the network access broadcast instruction, the wireless communication module enters the fixed-point transmission mode, and all terminal nodes reply to the information node with the network access request instruction in turn. The information node polls each terminal node in order of address. The terminal node that receives the polling instruction immediately replies with the response instruction. At this time, the terminal node successfully accesses the network and enters the low-power mode. During this period, the wireless communication module will enter the sleep-listening cycle working state; The temperature acquisition module continuously reads the temperature data and calculates the average value, and transmits the temperature data frame to the information node through the data communication module. At the same time, the terminal node enters the low power consumption mode and waits for the next round of acquisition cycle.

3. The distribution network line temperature monitoring system according to claim 1, characterized in that: The information node includes a power supply module, a main control chip, a storage module, a wireless communication module, and an LTE data transmission radio; The power supply modules respectively provide power for the LTE data transmission radio, wireless communication module and main control chip; The main functions of the main control chip of the information node are: ① transmission and analysis of networking data frames; ② command control of LTE data transmission radio; ③ control of data storage of storage module; ④ reception and analysis of temperature data frames; ⑤ control of working indication circuit to display the current working status of the information node. When networking with terminal nodes, the information node will register the terminal node's address, channel and node number. The information node will poll the terminal node in the subsequent networking process based on this information. The storage module plays a role in data storage during the networking process. The wireless communication module executes networking data communication, issues network access broadcast, network access polling and wake-up instructions. When the information node executes the networking process, it first broadcasts network access to the current frequency band and opens a time window to wait for the terminal node to send a network access request data frame. During this time window, each time a network access request data frame is received, the address and channel of the terminal node in the frame will be extracted and written into the storage module. In order to ensure that all terminal nodes can successfully join the network, when the time window ends, the information node will compare the number of received network access request data frames with the pre-set number of terminal nodes. If the former is less than the latter, it means that a terminal node has not received the network access broadcast instruction. At this time, the information node will resend the broadcast instruction. When the upper limit of the number of retransmissions is reached and the number is still less, it means that a terminal node has died. After the flag bit is updated, the polling process of checking the serial number of the dead node is entered. If the two are equal, the information node will send network access polling data frames in sequence according to the serial number of the terminal node. After the polling is completed, the timer is started, and the wake-up instruction is periodically broadcast to wake up the terminal node to collect temperature. After receiving the temperature data frame, the information node first performs a sum check on it and compares it with the check code in the data frame. When the results are consistent, the internal temperature data is extracted and encapsulated in the corresponding position in the information node cloud center data frame. After completing the encapsulation of all temperature data, it is reported to the platform layer through the LTE data transmission radio; the LTE data transmission radio is responsible for establishing a data link with the platform layer, using two serial interfaces, RS485 and RS232, for communication.

4. The distribution network line temperature monitoring system according to claim 1, characterized in that: The cloud center creates a custom interface named remote monitoring of contact temperature in the interface list. The interface is directly connected to the Internet of Things platform through the network in a custom data format. After the interface is created, a virtual device corresponding to the information node is created inside the interface. After the virtual device representing the information node is created, the object model of the terminal node is added to the virtual device. The object model is a data model that integrates attributes, events, and services. It is the attribute mapping of each terminal node in the cloud center. The attribute is the temperature number collected by the terminal node; the cloud database realizes remote storage of temperature data and access and reading by multiple clients.

5. The distribution network line temperature monitoring system according to claim 1, characterized in that: The data transmitted by the wireless network includes networking data and temperature data; The terminal nodes and information nodes establish the internal network autonomously through the bidirectional interaction of data frames. The networking data is classified into uplink data and downlink data according to the direction of data flow. Uplink data is sent from the terminal node to the information node, and downlink data is sent from the information node to the terminal node.

Images