Online monitoring platform based on carrier communication

Abstract

The invention relates to the technical field of power systems, in particular to an online monitoring platform based on carrier communication. The online monitoring platform comprises an edge calculation module, a carrier communication module and an energy taking module, the carrier communication module comprises a cross interconnection unit and a communication unit, the cross interconnection unit comprises a three-phase cable of a sheath communication path formed by sheath cross interconnection, and the communication unit is connected with the sheath communication path of the one-phase cable; the edge calculation module communicates with a background master station through the communication unit, and the energy taking module is connected with a sheath outgoing line of the other phase cable. According to the invention, the edge calculation module carries out edge processing on monitoring data collected in a cable channel environment, and then the monitoring data is uploaded to the background master station through the carrier communication module, so that mutual communication between online monitoring equipment in an old 110kV cable channel and the background master station is realized, and the energy taking module provides power for the online monitoring platform. Efficient and stable data transmission is realized, and the method is suitable for transformation and upgrading of old 110kV cable channels.

Description

Technical Field

[0001] The invention relates to the technical field of power systems, and in particular to an online monitoring platform based on carrier communication. Background Art

[0002] At present, with the continuous development of the power system, it is difficult to install new communication lines in the old 110kV cable trenches due to reasons such as age and technical limitations. In addition, wireless communication signals cannot be obtained in the trenches, so wireless data communication cannot be directly used. Various online monitoring devices are installed in grounding boxes and cable trenches. There are many sensors of various types and they are widely distributed. There is a lack of unified specifications in terms of standards, interfaces, and data transmission. At the same time, different types of monitoring data are involved, such as status monitoring and video service data streams, resulting in many types of data, large data volumes, and complex interfaces. In order to solve these problems, a new technical solution is needed to achieve reliable communication and broadband transmission. However, various online monitoring devices in cable trenches still require 220V AC distribution boxes and DC power supply in the trenches, which requires additional transmission lines to be laid, increasing operation and maintenance costs.

[0003] In the carrier communication technology of the power system, since the outer sheath of the cable is well protected, the cable shielding layer is used as a carrier for communication signal transmission. With the help of the power cable shielding layer for data transmission, there is no need to lay communication cables or build a wireless data transmission system. In addition, the cable shielding layer will not be in direct contact with the energized conductor core, and there will be a shielding frame and a cross-linking layer in the middle for isolation. Using the cable shielding layer as a carrier for high-frequency signal transmission can basically eliminate the noise generated by electromagnetic induction of large currents in the power line. Although the technology is currently limited to 5km due to the very fast signal attenuation when the high-frequency signal is transmitted in the cable shielding layer, the communication distance is often limited to 5km, which leads to its main application in cable medium voltage (10kV and 35kV) distribution network automation communication, and has not been applied to high-voltage cross-connected cable communication. However, since the length of a cross-connected cable will not exceed 5km, it is feasible to use high-frequency signal carrier communication based on the cable shielding layer to realize the broadband communication transformation of the old 110kV cable channel. Summary of the invention

[0004] The purpose of the present invention is to provide an online monitoring platform based on carrier communication to solve the problem of communication difficulties faced by old 110kV cable trenches in the prior art due to age, technical limitations and other reasons.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] The present invention discloses an online monitoring platform based on carrier communication, comprising:

[0007] An edge computing module, the edge computing module is used to obtain monitoring data collected by online monitoring equipment in the cable trench environment, and perform edge processing on the acquired monitoring data;

[0008] A carrier communication module, the carrier communication module includes a cross-interconnection unit and a communication unit, the cross-interconnection unit includes a three-phase cable with sheaths cross-interconnected to form a sheath communication path, the communication unit is connected to the sheath communication path of one phase of the cable, and the edge computing module communicates with the background master station through the communication unit;

[0009] An energy acquisition module is connected to the sheath lead-out line of another phase of the cable, and is used to obtain the induced voltage and / or induced current of the cable sheath, and provide electrical energy for the edge computing module, the carrier communication module and the online monitoring equipment.

[0010] Optionally, the edge computing module includes a main control unit, and a communication docking unit, a sensing docking unit and a storage unit electrically connected to the main control unit respectively;

[0011] The communication docking unit includes a plurality of first communication interfaces docked with the communication unit and used for data communication between the main control unit and the communication unit;

[0012] The sensing docking unit includes a plurality of second communication interfaces docked with the online monitoring device, which are used for data communication between the main control unit and the online monitoring device, and the storage unit is used for storing the monitoring data acquired by the main control unit.

[0013] Optionally, the edge computing module includes a security encryption unit and an audio-visual alarm display unit. The security encryption unit is electrically connected to the main control unit for encrypting the monitoring data acquired by the main control unit. The audio-visual alarm display unit is electrically connected to the main control unit for issuing an alarm when abnormal communication occurs between the main control unit and the online monitoring device.

[0014] Optionally, the energy acquisition module includes an energy acquisition unit and a circuit protection unit;

[0015] The power input port of the energy acquisition unit is connected to the sheath lead wire of one phase of the cable to obtain power from the sheath of the cable, and the power output port of the energy acquisition unit is electrically connected to the main control unit, the communication unit and the online monitoring device respectively;

[0016] The circuit protection unit is electrically connected to the power input port of the energy acquisition unit, and is used to control the energy acquisition unit to cut off and conduct power supply according to the voltage threshold of the energy acquisition unit at the power input port.

[0017] Optionally, the energy acquisition unit includes a voltage limiting circuit, a rectifier bridge, a filter circuit, a transient suppression diode and a DC-DC conversion circuit which are electrically connected in sequence, the power input port of the voltage limiting circuit is connected to the sheath lead wire of one phase of the cable, and the power output port of the DC-DC conversion circuit is electrically connected to the main control unit, the communication unit and the online monitoring device respectively.

[0018] Optionally, the energy acquisition module further includes an energy storage unit, the power input port of the energy storage unit is electrically connected to the power output port of the energy acquisition unit, and the energy acquisition unit stores part of the power in the energy storage unit, and the power output port of the energy storage unit is electrically connected to the main control unit, the communication unit and the online monitoring device respectively;

[0019] The signal output port of the circuit protection unit is electrically connected to the signal input port of the main control unit, so that the main control unit can obtain the power supply status of the energy acquisition unit. The signal output end of the main control unit is electrically connected to the signal input port of the energy storage unit, so as to control the energy storage unit to cut off and conduct the backup power.

[0020] Optionally, the communication unit includes a metal box and a power line data transmission device arranged in the metal box, the power line data transmission device includes a carrier device and a coupler, the carrier device is electrically connected to the edge computing module and the coupler, respectively, the input port of the coupler is connected to the sheath communication path of the cable, and the output port of the coupler is grounded, so that the coupler, the sheath of the cable and the ground constitute a high-frequency return channel for the carrier signal.

[0021] Optionally, grounding nodes are arranged at both ends of the three-phase cable, the three-phase cable is connected to a communication unit at the grounding node, and the metal box at the grounding node constitutes a direct grounding box;

[0022] A plurality of cross-connection nodes are arranged between the two ends of the three-phase cable, the three-phase cable is connected to a communication unit at the cross-connection node, and the metal box at the cross-connection node constitutes a cross-connection box;

[0023] The communication unit communicates with the other communication units through a sheath communication path of one phase of the cable.

[0024] Optionally, the edge computing module and the energy acquisition module are both arranged in the metal box of the communication unit, and each of the communication units has a one-to-one correspondence with the edge computing module and the energy acquisition module;

[0025] Among them, the edge computing modules at the grounding node and the cross-connection node constitute a data sending end by communicating with the online monitoring equipment, and the edge computing module at the grounding node constitutes a data receiving end by communicating with the background main station.

[0026] Optionally, the online monitoring platform includes a plurality of the cross-interconnection units, and the adjacent grounding nodes of two adjacent cross-interconnection units share one direct grounding box, and the direct grounding box is configured with one carrier device and two couplers, and the two couplers and the grounding nodes of the two cross-interconnection units are connected one-to-one.

[0027] Compared with the prior art, the online monitoring platform based on carrier communication provided by the embodiment of the present invention has the following beneficial effects:

[0028] The communication unit connected to the sheath communication path of one-phase cable is used as the communication station, and the sheath of the sheath communication path formed by the cross-interconnection of three-phase cables is used as the signal transmission carrier, making full use of the power company's own cable resources for data transmission, avoiding the need for additional wiring, and using it as the carrier communication module of the online monitoring platform. The edge computing module performs edge processing on the monitoring data collected by the online monitoring equipment in the cable trench environment, and then uploads the edge-processed monitoring data to the background master station through the carrier communication module, thereby realizing mutual communication between the online monitoring equipment and the background master station in the old 110kV cable trench. At the same time, the cable sheath induction voltage / current energy extraction technology is adopted, and the energy extraction module provides power for the online monitoring platform to achieve efficient and stable data transmission in the online monitoring platform, which is suitable for the transformation and upgrading of old 110kV cable trenches and reduces system costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0030] Figure 1 A schematic diagram of the transmission architecture of the online monitoring platform provided by an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of the overall framework of an online monitoring platform provided by an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of the hardware architecture of an edge computing module provided in an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of the principle framework of the energy acquisition module provided in an embodiment of the present invention.

[0034] The reference numerals in the figures are:

[0035] 1. Edge computing module; 11. Main control unit; 12. Communication docking unit; 13. Perception docking unit; 14. Storage unit; 15. Security encryption unit; 16. Sound and light alarm display unit; 2. Carrier communication module; 21. Cross-connection unit; 21. Metal box; 22. Carrier device; 23. Coupler; 3. Energy acquisition module; 31. Energy acquisition unit; 32. Circuit protection unit; 33. Energy storage unit; 4. Online monitoring equipment; 5. Backend master station. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, the preferred embodiments of the present invention are described in detail.

[0037] The present invention discloses an online monitoring platform based on carrier communication, such as Figure 1 and Figure 2 As shown, it includes an edge computing module 1, a carrier communication module 2 and an energy acquisition module 3. The edge computing module 1 is used to obtain the monitoring data collected by the online monitoring device 4 in the cable trench environment, and perform edge processing on the acquired monitoring data. The carrier communication module 2 includes a cross-interconnection unit 21 and a communication unit. The cross-interconnection unit 21 includes a three-phase cable whose sheaths are cross-interconnected to form a sheath communication path. The communication unit is connected to the sheath communication path of one-phase cable. The edge computing module 1 communicates with the background master station 5 through the communication unit. The energy acquisition module 3 is connected to the sheath lead-out line of another phase cable, and is used to obtain the induced voltage and / or induced current of the cable sheath, and provide electrical energy to the edge computing module 1, the carrier communication module 2 and the online monitoring device 4.

[0038] Through the implementation method of the above-mentioned online monitoring platform, a communication unit connected to the sheath communication path of a single-phase cable is used as a communication station, and the sheath of the sheath communication path formed by the cross-interconnection of three-phase cables is used as a signal transmission carrier, so as to make full use of the power company's own cable resources for data transmission, avoiding the need for additional wiring, and using it as the carrier communication module 2 of the online monitoring platform in the embodiment of the present invention. The edge computing module 1 performs edge processing on the monitoring data collected by the online monitoring device 4 in the cable trench environment, and then uploads the edge-processed monitoring data to the background master station 5 through the carrier communication module 2, thereby realizing the mutual communication between the online monitoring device 4 and the background master station 5 in the old 110kV cable trench, and the monitoring data can also be matched and uploaded to the intelligent business terminal according to the application scenario. At the same time, the cable sheath induction voltage / current energy extraction technology is adopted, and the energy extraction module 3 provides power for the online monitoring platform, without the need to lay additional transmission lines, reducing the operation and maintenance costs, and is suitable for the transformation and upgrading of old 110kV cable trenches.

[0039] Furthermore, combined with Figure 3 As shown, the edge computing module 1 includes a main control unit 11, and a communication docking unit 12, a sensing docking unit 13 and a storage unit 14 which are electrically connected to the main control unit 11 respectively;

[0040] The communication docking unit 12 includes a plurality of first communication interfaces docked with the communication unit, and is used for data communication between the main control unit 11 and the communication unit;

[0041] The sensing docking unit 13 includes a plurality of second communication interfaces docked with the online monitoring device 4 and is used for data communication between the main control unit 11 and the online monitoring device 4 , and the storage unit 14 is used for storing monitoring data acquired by the main control unit 11 .

[0042] Through the implementation of the above-mentioned online monitoring platform, several first communication interfaces are preferably one or more of optical fiber interface, PLC interface, Ethernet interface and 4G / 5G wireless interface. Several second communication interfaces are preferably one or more of local communication network protocol adapter interfaces such as LoRa wireless interface, RS485 / 232 interface, Ethernet interface, DVP interface and expansion interface. The use of multiple first communication interfaces can adapt to different communication needs and environments to ensure the stable transmission of data communication between the main control unit 11 and the communication unit. At the same time, multiple second communication interfaces are used, especially LoRa wireless communication or two serial ports of RS232 and RS485 are used to receive the monitoring data of the online monitoring device 4, which can meet the access of different types of online monitoring devices 4, increase the compatibility and scalability of the system, realize the flexible docking of the online monitoring device 4, and avoid the situation of many types of data, large data volume and complex interface. In addition, the monitoring data can be stored in real time by the storage unit 14, which is convenient for subsequent analysis and processing, and also improves the security of the data.

[0043] Preferably, the main control unit 11 selects a suitable main control chip according to specific application requirements and performance requirements, and can consider chips with powerful computing power, rich interfaces and low power consumption characteristics, such as STM32F407 series MCU, RaspberryPi4, etc. The main control unit 11 is connected to the storage unit 14 through a corresponding communication interface (such as SPI, I2C, etc.) to realize data storage and reading. The storage unit 14 can select a suitable storage medium according to the amount of data to be stored and the read and write speed requirements, such as DDR4 memory, which can provide high-speed data reading and writing, suitable as the running memory of the main control module; or eMMC / UFS storage, which is used to store applications, operating systems and user data, and provide stable storage performance. The online monitoring platform of the embodiment of the present invention processes and manages data through the main control unit 11, which can realize centralized monitoring and analysis of monitoring data, improve work efficiency and management level, and enable the edge computing module 1 to process and analyze data close to the data source, reduce the delay of data transmission, and improve the real-time performance of the system.

[0044] Furthermore, the edge computing module 1 includes a security encryption unit 15 and an audio-visual alarm display unit 16. The security encryption unit 15 is electrically connected to the main control unit 11, and is used to encrypt the monitoring data obtained by the main control unit 11. The audio-visual alarm display unit 16 is electrically connected to the main control unit 11, and is used to issue an alarm when abnormal communication occurs between the main control unit 11 and the online monitoring device 4.

[0045] Through the implementation method of the above-mentioned online monitoring platform, the main control unit 11 and the storage unit 14, the security encryption unit 15 and the sound and light alarm display unit 16 are connected through a bus to realize data interaction and control. The security encryption unit 15 is used to protect the security and integrity of the monitoring data to prevent the data from being stolen or tampered with. In the online monitoring platform of the embodiment of the present invention, the security encryption unit 15 can be implemented by a hardware encryption chip or a software encryption algorithm. The sound and light alarm display unit 16 is used to emit a sound and light alarm signal when abnormal data transmission or abnormal power supply of the energy acquisition unit 31 is detected, so as to remind the background monitoring personnel to take corresponding measures. In the online monitoring platform of the embodiment of the present invention, the sound and light alarm display unit 16 may include a buzzer, a signal light, a display screen, etc.

[0046] Furthermore, combined with Figure 3 and Figure 4 As shown, the energy acquisition module 3 includes an energy acquisition unit 31 and a circuit protection unit 32;

[0047] The power input port of the energy acquisition unit 31 is connected to the sheath lead wire of a phase cable to obtain power from the sheath of the cable. The power output port of the energy acquisition unit 31 is electrically connected to the main control unit 11, the communication unit and the online monitoring device 4 respectively;

[0048] The circuit protection unit 32 is electrically connected to the power input port of the energy taking unit 31 , and is used to control the energy taking unit 31 to cut off and conduct the power supply according to the voltage threshold at the power input port of the energy taking unit 31 .

[0049] Through the implementation of the above-mentioned online monitoring platform, the energy acquisition unit 31 is used to obtain electric energy from the sheath of the cable to provide power for the online monitoring platform of the embodiment of the present invention, which reduces the introduction of external power supply, does not require additional transmission lines, reduces operation and maintenance costs, and improves the safety and reliability of the system. At the same time, the circuit protection unit 32 can control the power supply of the energy acquisition unit 31 according to the voltage threshold, avoids the damage of the energy acquisition unit 31 due to overvoltage or undervoltage, and further improves the stability and reliability of the system. That is, when the circuit protection unit 32 detects that the voltage at the power input port of the energy acquisition unit 31 is greater than the set threshold, the power input port of the energy acquisition unit 31 is short-circuited, so that the subsequent circuit of the energy acquisition unit 31 is disconnected, and preferably it can be switched to the backup power supply mode to ensure that the sheath of the cable line is effectively grounded when it is subjected to an impact current, and to avoid instantaneous large currents from burning subsequent circuits. Preferably, the circuit protection unit 32 can use a circuit breaker as the main protection element and be installed at the power input port of the energy acquisition unit 31. When the current exceeds the set value, the circuit breaker will trip quickly and cut off the circuit to protect the energy acquisition unit 31 and other related equipment from overload and short circuit. In addition, the power output port of the energy acquisition unit 31 is electrically connected to the main control unit 11, the communication unit and the online monitoring device 4, respectively, to achieve power supply and data transmission between the units, and ensure the normal operation of the monitoring platform.

[0050] Furthermore, the energy acquisition unit 31 includes a voltage limiting circuit, a rectifier bridge, a filter circuit, a transient suppression diode, and a DC-DC conversion circuit that are electrically connected in sequence. The power input port of the voltage limiting circuit is connected to the sheath lead wire of a phase cable, and the power output port of the DC-DC conversion circuit is electrically connected to the main control unit 11, the communication unit, and the online monitoring device 4, respectively.

[0051] Through the implementation method of the above-mentioned online monitoring platform, the cascade of the voltage limiting circuit, the rectifier bridge, the filter circuit, the transient suppression diode and the DC-DC conversion circuit is used to obtain electric energy from the sheath of the cable and convert it into a stable DC electric energy output. Among them, the voltage limiting circuit is used to limit the input voltage to prevent the energy acquisition unit 31 from being damaged by overvoltage; the rectifier bridge converts AC power into DC power; the filter circuit filters the DC power to improve the quality of electric energy; the transient suppression diode is used to protect the energy acquisition unit 31 from transient overvoltage; the DC-DC conversion circuit performs step-up or step-down conversion on the electric energy to meet the working voltage requirements of the main control unit 11, the communication unit and the online monitoring device 4. Thereby, the energy acquisition unit 31 can adapt to cables of different voltage levels and provide a reliable power supply for the online monitoring platform of the embodiment of the present invention.

[0052] Furthermore, the energy acquisition module 3 also includes an energy storage unit 33. The power input port of the energy storage unit 33 is electrically connected to the power output port of the energy acquisition unit 31, so that the energy acquisition unit 31 stores part of the power in the energy storage unit 33. The power output port of the energy storage unit 33 is electrically connected to the main control unit 11, the communication unit and the online monitoring device 4 respectively;

[0053] The signal output port of the circuit protection unit 32 is electrically connected to the signal input port of the main control unit 11, so that the main control unit 11 can obtain the power supply status of the energy acquisition unit 31. The signal output end of the main control unit 11 is electrically connected to the signal input port of the energy storage unit 33, so as to control the energy storage unit 33 to cut off and conduct the backup power.

[0054] Through the implementation of the above-mentioned online monitoring platform, the main control unit 11 is the core of the energy acquisition unit 31 for energy acquisition, and the functions of voltage monitoring, current monitoring, power switching and channel control are completed through special algorithms and control logic. When the protection circuit detects that the voltage of energy acquisition is greater than the set threshold, the circuit of the energy acquisition unit 31 is disconnected and switched to the mode of power supply by the energy storage unit 33. Since the energy acquisition unit 31 is used to store part of the electric energy in the energy storage unit 33, the energy storage unit 33 is used to store and back up the electric energy, so as to provide a reliable power supply, reduce the risk of system power failure or short circuit caused by the failure of the energy acquisition unit 31 or external interference, and improve the stability and reliability of the system. At the same time, the circuit protection unit 32 monitors the power supply status of the energy acquisition unit 31 in real time, and transmits the signal to the main control unit 11. The main control unit 11 controls the electric energy output of the energy storage unit 33 according to the power supply status, avoids the damage of the energy acquisition unit 31 due to overvoltage, overcurrent and other faults, realizes the protection and control of the energy acquisition unit 31, and prolongs the service life of the energy acquisition unit 31. Preferably, the energy storage unit 33 is composed of a lithium battery to provide backup output power to ensure the power supply requirements of the online monitoring platform, various sensors or online monitoring equipment 4.

[0055] Further, look back Figure 2 The communication unit includes a metal box 21 and a power line data transmission device arranged in the metal box 21. The power line data transmission device includes a carrier device 22 and a coupler 23, and the carrier device 22 is electrically connected to the edge computing module 1 and the coupler 23 respectively. The input port of the coupler 23 is connected to the sheath communication path of the one-phase cable, and the output port of the coupler 23 is grounded, so that the coupler 23, the sheath of the cable and the ground constitute a high-frequency return channel for the carrier signal.

[0056] Through the implementation of the above-mentioned online monitoring platform, the communication unit is composed of a metal box 21 and an internal power line data transmission device. The metal box 21 improves the anti-interference ability and protection level of the power line data transmission device, reduces the impact of the external environment on the internal system of the metal box 21, and ensures the stability and safety of the entire communication unit. At the same time, the carrier device 22 is connected to the sheath communication path of the one-phase cable through the coupler 23, and the injection coupler 23 is used. The earth is used as the signal return path to form a high-frequency return channel. The signal is transmitted through the sheath communication path of the one-phase cable and transmitted back through the earth, realizing power line carrier communication, ensuring the effective transmission and return of the carrier signal, reducing the impact of external interference on communication, so as to improve the transmission quality and anti-interference ability of the signal, thereby improving the reliability and stability of communication. It also simplifies the structure of the communication system, does not need to lay additional communication lines, and reduces the engineering cost and construction difficulty. In addition, in order to improve the anti-interference ability and transmission quality of the signal, the online monitoring platform of the embodiment of the present invention adopts a variety of spread spectrum communication technologies with orthogonal frequency division multiplexing (OFDM) as the core. OFDM technology divides the signal into multiple subcarriers, and realizes modulation and demodulation through Fast Fourier Transform (Fast Fourier Transform, FFT) and Inverse Fast Fourier Transform (Inverse Fast Fourier Transform, IFFT). This method can effectively reduce inter-code interference and inter-channel interference, and improve the transmission efficiency and reliability of the signal. Among them, the coupler 23 is preferably an inductive coupler or a composite coupler based on transformer and capacitor coupling.

[0057] Preferably, the sheath induced voltage of the 110kV cross-connected cable is 50-100V, and the sheath current flowing through its joints can reach 1-20A, which can provide a stable power of more than 50W for the load, meet the energy supply requirements of the cable comprehensive online monitoring platform system and the online monitoring equipment 4, and there is no problem of electromagnetic induction energy extraction efficiency being affected by the load.

[0058] Further, grounding nodes are arranged at both ends of the three-phase cable, the three-phase cable is connected to a communication unit at the grounding node, and the metal box 21 at the grounding node constitutes a direct grounding box;

[0059] A plurality of cross-connection nodes are arranged between the two ends of the three-phase cable, the three-phase cable is connected to a communication unit at the cross-connection node, and the metal box 21 at the cross-connection node constitutes a cross-connection box;

[0060] The communication unit communicates with other communication units through the sheath communication path of one-phase cable.

[0061] Through the implementation of the above online monitoring platform, Figure 2 As shown, in a cross-interconnection unit 21, the sheath of a single-phase cable is divided into three sections, and a cross-interconnection interval is formed between two adjacent sections of the sheath. For example: the A-phase cable includes a metal sheath of section A1, a metal sheath of section A2, and a metal sheath of section A3. The two ends of the three-phase cable are directly grounded, and the joint at the middle cross-interconnection node is grounded through a sheath protector to form a low-impedance closed path. On this basis, a direct grounding box is formed by the metal box 21 at the grounding node, and the metal box 21 can be connected to the grounding terminal through a grounding wire, and then connected to the ground, so that when the equipment leaks or other faults occur, the current can quickly flow into the ground through the grounding wire, thereby avoiding the risk of electric shock to personnel, ensuring the stability and safety of the entire communication unit, and protecting the cable and equipment from lightning strikes and overcurrent. In addition, the cross-interconnection box is formed by the metal box 21 at the cross-interconnection node, which is used to reduce the inductance and capacitance in the cable line and improve the transmission characteristics of the cable. On the other hand, by using the communication unit to communicate with the other communication units through the sheath communication path of one-phase cable, a group of communication units can be used for every three sections (one cross-interconnection unit 21), and each node only needs one coupler 23. The current injected by inductive coupling circulates through the sheath communication path and uses it to establish communication between nodes to achieve data exchange and sharing between communication units. This communication method uses the sheath of the cable as a communication medium, does not require additional communication lines to be laid, and reduces engineering costs and construction difficulties.

[0062] Furthermore, the edge computing module 1 and the energy acquisition module 3 are both arranged in the metal box 21 of the communication unit, and each communication unit has a one-to-one correspondence with the edge computing module 1 and the energy acquisition module 3;

[0063] Among them, the edge computing module 1 at the grounding node and the cross-connection node constitutes a data sending end by communicating with the online monitoring device 4, and the edge computing module 1 at the grounding node constitutes a data receiving end by communicating with the background main station 5.

[0064] Through the implementation of the above-mentioned online monitoring platform, each communication unit is one-to-one corresponding to an edge computing module 1 and an energy acquisition module 3, so that at each node, an edge computing module 1 can be used to perform real-time processing and analysis on the monitoring data received by the communication unit at the node, reducing the delay of data transmission, improving the response speed of the system, ensuring that each node can obtain timely data processing and power supply, and improving the reliability of the system. In the signal transmission process, at a single node, the edge computing module 1 transmits the monitoring data acquired and processed at the edge to the coupler 23 through the RS232 or RS485 interface, and the coupler 23 injects the data signal into the sheath of the cable. Once the signal reaches the destination node, the coupler 23 at the data receiving end extracts the data signal and sends it to the background master station 5 through the carrier device 22 and the edge computing module 1, so as to realize the mutual communication between the online monitoring device 4 and the background master station 5 at each node, so that the monitoring personnel can centrally manage and monitor multiple communication units through the background master station 5, thereby improving the management efficiency of the system. In addition, since each communication unit corresponds to an edge computing module 1 and an energy acquisition module 3, the monitoring points and functions of the system can be easily expanded. You only need to add new communication units at the required locations and make corresponding configurations and connections to expand the system and meet the needs of different application scenarios.

[0065] Furthermore, the online monitoring platform includes multiple cross-interconnection units 21, and the adjacent grounding nodes of two adjacent cross-interconnection units 21 share a direct grounding box, and the direct grounding box is configured with a carrier device 22 and two couplers 23, and the two couplers 23 are connected to the grounding nodes of the two cross-interconnection units 21 in a one-to-one correspondence.

[0066] Through the implementation of the online monitoring platform, the grounding nodes adjacent to two adjacent cross-interconnection units 21 share a common direct grounding box, and the power line data transmission device in the direct grounding box plays a relay role between the two cross-interconnection units 21.

[0067] The online monitoring platform based on carrier communication in the embodiment of the present invention adopts a communication unit connected to the sheath communication path of a single-phase cable as a communication station, and uses the sheath of the sheath communication path formed by the cross-interconnection of three-phase cables as a signal transmission carrier, making full use of the power company's own cable resources for data transmission, avoiding the need for additional wiring, and using it as the carrier communication module 2 of the online monitoring platform. The edge computing module 1 at multiple nodes on the three-phase cable performs edge processing on the monitoring data collected by the online monitoring device 4 at the corresponding position in the cable trench environment, and then uploads the edge-processed monitoring data through the carrier communication module 2. Once the signal reaches the destination node, the coupler 23 at the data receiving end extracts the data signal and sends it to the background master station 5 through the carrier device 22 and the edge computing module 1, so as to realize the mutual communication between the online monitoring device 4 and the background master station 5 at each node, so that the monitoring personnel can centrally manage and monitor multiple communication units through the background master station 5, thereby realizing the mutual communication between the online monitoring device 4 and the background master station 5 in the old 110kV cable trench. At the same time, the cable sheath induction voltage / current energy harvesting technology is adopted, and the energy harvesting module 3 provides power for the online monitoring platform. Through reasonable power management and optimization algorithms, the energy harvesting module 3 can provide a stable power supply for the edge computing module 1 and other electronic devices without the need for an external power supply, thereby reducing dependence on external power supplies and reducing the operating costs of the system, so as to achieve efficient and stable data transmission in the online monitoring platform. It is suitable for the transformation and upgrading of old 110kV cable trenches and reduces system costs.

[0068] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the protection scope of the claims attached to the present invention.

Claims

1. An online monitoring platform based on carrier communication, characterized in that: The online monitoring platform comprises: An edge computing module, the edge computing module is used to obtain monitoring data collected by online monitoring equipment in the cable trench environment, and perform edge processing on the acquired monitoring data; A carrier communication module, the carrier communication module includes a cross-interconnection unit and a communication unit, the cross-interconnection unit includes a three-phase cable with sheaths cross-interconnected to form a sheath communication path, the communication unit is connected to the sheath communication path of one phase of the cable, and the edge computing module communicates with the background master station through the communication unit; An energy acquisition module is connected to the sheath lead-out line of another phase of the cable, and is used to obtain the induced voltage and / or induced current of the cable sheath, and provide electrical energy for the edge computing module, the carrier communication module and the online monitoring equipment.

2. The online monitoring platform based on carrier communication according to claim 1, characterized in that: The edge computing module includes a main control unit, and a communication docking unit, a sensing docking unit and a storage unit electrically connected to the main control unit respectively; The communication docking unit includes a plurality of first communication interfaces docked with the communication unit and used for data communication between the main control unit and the communication unit; The sensing docking unit includes a plurality of second communication interfaces docked with the online monitoring device, which are used for data communication between the main control unit and the online monitoring device, and the storage unit is used for storing the monitoring data acquired by the main control unit.

3. The online monitoring platform based on carrier communication according to claim 2 is characterized in that: The edge computing module includes a security encryption unit and an audio-visual alarm display unit. The security encryption unit is electrically connected to the main control unit and is used to encrypt the monitoring data acquired by the main control unit. The audio-visual alarm display unit is electrically connected to the main control unit and is used to issue an alarm when there is abnormal communication between the main control unit and the online monitoring device.

4. The online monitoring platform based on carrier communication according to claim 2 is characterized in that: The energy acquisition module includes an energy acquisition unit and a circuit protection unit; The power input port of the energy acquisition unit is connected to the sheath lead wire of one phase of the cable to obtain power from the sheath of the cable, and the power output port of the energy acquisition unit is electrically connected to the main control unit, the communication unit and the online monitoring device respectively; The circuit protection unit is electrically connected to the power input port of the energy acquisition unit, and is used to control the energy acquisition unit to cut off and conduct power supply according to the voltage threshold of the energy acquisition unit at the power input port.

5. The online monitoring platform based on carrier communication according to claim 4 is characterized in that: The energy acquisition unit includes a voltage limiting circuit, a rectifier bridge, a filter circuit, a transient suppression diode and a DC-DC conversion circuit which are electrically connected in sequence. The power input port of the voltage limiting circuit is connected to the sheath lead wire of one phase of the cable, and the power output port of the DC-DC conversion circuit is electrically connected to the main control unit, the communication unit and the online monitoring device respectively.

6. The online monitoring platform based on carrier communication according to claim 4 is characterized in that: The energy acquisition module also includes an energy storage unit, the power input port of the energy storage unit is electrically connected to the power output port of the energy acquisition unit, and the energy acquisition unit stores part of the power in the energy storage unit, and the power output port of the energy storage unit is electrically connected to the main control unit, the communication unit and the online monitoring device respectively; The signal output port of the circuit protection unit is electrically connected to the signal input port of the main control unit, so that the main control unit can obtain the power supply status of the energy acquisition unit. The signal output end of the main control unit is electrically connected to the signal input port of the energy storage unit, so as to control the energy storage unit to cut off and conduct the backup power.

7. The online monitoring platform based on carrier communication according to any one of claims 1 to 6, characterized in that: The communication unit includes a metal box and a power line data transmission device arranged in the metal box, the power line data transmission device includes a carrier device and a coupler, the carrier device is electrically connected to the edge computing module and the coupler respectively, the input port of the coupler is connected to the sheath communication path of the cable, and the output port of the coupler is grounded, so that the coupler, the sheath of the cable and the ground constitute a high-frequency return channel for the carrier signal.

8. The online monitoring platform based on carrier communication according to claim 7, characterized in that: Grounding nodes are arranged at both ends of the three-phase cable, the three-phase cable is connected to a communication unit at the grounding node, and the metal box at the grounding node constitutes a direct grounding box; A plurality of cross-connection nodes are arranged between the two ends of the three-phase cable, the three-phase cable is connected to a communication unit at the cross-connection node, and the metal box at the cross-connection node constitutes a cross-connection box; The communication unit communicates with the other communication units through a sheath communication path of one phase of the cable.

9. The online monitoring platform based on carrier communication according to claim 8, characterized in that: The edge computing module and the energy acquisition module are both arranged in the metal box of the communication unit, and each of the communication units has a one-to-one correspondence with the edge computing module and the energy acquisition module; Among them, the edge computing modules at the grounding node and the cross-connection node constitute a data sending end by communicating with the online monitoring equipment, and the edge computing module at the grounding node constitutes a data receiving end by communicating with the background main station.

10. The online monitoring platform based on carrier communication according to claim 8, characterized in that: The online monitoring platform includes a plurality of the cross-interconnection units, and the grounding nodes adjacent to two adjacent cross-interconnection units share one direct grounding box, and the direct grounding box is configured with one carrier device and two couplers, and the two couplers and the grounding nodes of the two cross-interconnection units are connected one-to-one.

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