Wireless ACU system of power grid tunnel pipe gallery

Abstract

The embodiment of the utility model provides a wireless ACU system of a power grid tunnel pipe gallery, and belongs to the technical field of communication. The wireless ACU system of the power grid tunnel pipe gallery comprises a plurality of ACU devices which are arranged in the pipe gallery at intervals along the power grid tunnel pipe gallery; wherein each ACU device is in communication connection with the corresponding edge internet-of-things proxy device based on wired communication and / or wireless communication; and the at least one set of edge internet-of-things agent device is deployed at the end of the power grid tunnel pipe gallery. According to the scheme of the utility model, a wireless communication mode is added in the ACU device, capacity expansion setting of other access modules can also be realized, and the overall supervision performance of the power grid tunnel pipe gallery is improved. And through a wired and wireless redundant communication scheme, the stability of communication in the power grid tunnel pipe gallery is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of communication, in particular to a wireless ACU system for a power grid tunnel gallery. Background Art

[0002] Cables play a vital role in urban power transmission. With the continuous improvement of economic level, urban overhead lines are gradually replaced by underground cables and internal pipeline cables. The development is particularly obvious in first- and second-tier cities. Power cables run through cities. Their safe, stable and reliable operation is an important factor in the urban energy system. Once a cable failure occurs, it directly affects the work and life of urban residents. Therefore, the safe operation and maintenance of urban cables is crucial. Cables have good mechanical and electrical properties. Most of the failures are caused by the aging of the insulation layer. There are many factors that affect aging, such as the cable material itself, the external operating environment, and human or foreign body damage. Each factor or multiple factors will cause different degrees of cable aging. According to the stress that causes cable insulation aging, it can be roughly divided into thermal aging, electrical aging, water aging, chemical corrosion, mechanical aging, etc., but the root cause is high temperature heating. Continuous high temperature causes thermal aging and insulation aging. The main inducing factors. In this field, researchers from all walks of life have carried out in-depth research and monitoring methods, deployed a large number of monitoring terminals, such as temperature measurement, partial discharge measurement, circulating current measurement, and environmental measurement, and collected a large amount of data to transmit to the remote cable lean management and control platform. The data transmission from the cable side to the platform side has complex environment, ground and underground connection, large interference and other unfavorable characteristics. It is necessary to select a stable and reliable transmission network to support data transmission.

[0003] The existing communication solutions in power grid tunnels and corridors have the problem of poor stability. To address this problem, wired communication can partially solve the problem, such as optical fiber, Ethernet or carrier mode. However, wired data transmission in tunnels has many disadvantages, including high construction cost and easy damage. Therefore, the existing solutions cannot take into account both communication stability and construction cost. To address this problem, it is necessary to create a communication solution suitable for power grid tunnels and corridors. Utility Model Content

[0004] The purpose of the embodiment of the utility model is to provide a wireless ACU system for a power grid tunnel corridor to solve the problem that the communication stability and construction cost cannot be taken into account in the existing communication scheme in the power grid tunnel corridor.

[0005] In order to achieve the above-mentioned purpose, an embodiment of the utility model provides a wireless ACU system for a power grid tunnel corridor, wherein the wireless ACU system for the power grid tunnel corridor comprises: a plurality of ACU devices arranged at intervals inside the corridor along the power grid tunnel corridor; wherein each ACU device is communicatively connected with a corresponding edge IoT agent device based on wired communication and / or wireless communication; and at least one set of the edge IoT agent device is deployed at the end of the power grid tunnel corridor.

[0006] Optionally, the ACU device is an ACU device developed based on modularization.

[0007] Optionally, the wireless ACU system of the power grid tunnel corridor further includes: a plurality of sensors arranged along the power grid tunnel corridor, for collecting real-time environmental information within the power grid tunnel corridor.

[0008] Optionally, the ACU device includes multiple communication interfaces.

[0009] Optionally, the communication interfaces of the ACU device include: R485 interface, AI / DI interface, DO 2A / 24V interface, Gigabit network port, 100M network port and fiber optic network interface.

[0010] Optionally, each sensor is only connected to the ACU device of the corresponding pre-zoned section, and each sensor is connected to the corresponding ACU device based on wired communication and / or wireless communication.

[0011] Optionally, the ACU device, the edge IoT agent device and the sensor have the same communication protocol.

[0012] Optionally, the processor of the ACU device is a SCMZB801A core board.

[0013] Optionally, the ACU device includes: an LPWAN channel and a Bluetooth channel.

[0014] Optionally, the chip of the LPWAN channel is a SCM325 chip.

[0015] Through the above technical solution, in the traditional ACU communication network, multiple ACU devices are arranged at intervals along the power grid tunnel corridor, and wireless communication is integrated in the construction of the communication link of each ACU device to realize the ACU communication network of wired combined with wireless communication. While adding wireless communication methods to the ACU device, it is also possible to realize the expansion setting of other access modules, thereby improving the overall supervision performance of the power grid tunnel corridor. The stability of communication in the power grid tunnel corridor is guaranteed by the wired plus wireless redundant communication solution.

[0016] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. In the accompanying drawings:

[0018] Figure 1 This is a system structure diagram of a wireless ACU system for a power grid tunnel corridor provided by one implementation method of the utility model;

[0019] Figure 2 It is a structural diagram of a wireless communication module provided by one implementation method of the utility model. DETAILED DESCRIPTION

[0020] The specific implementation of the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the utility model, and is not used to limit the embodiment of the utility model.

[0021] In the embodiments of the present utility model, unless otherwise specified, directional words such as "up, down, left, right" generally refer to the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the utility model product is usually placed when in use.

[0022] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0023] The terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal, vertical or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In addition, the terms "roughly" and "basically" are intended to explain that the relevant content does not require absolute precision, but can have certain deviations. For example, "roughly equal" does not only mean absolute equality. Since it is difficult to achieve absolute "equality" in actual production and operation, there are generally certain deviations. Therefore, in addition to absolute equality, "roughly equal" also includes the above-mentioned situation with certain deviations. Taking this as an example, in other cases, unless otherwise specified, the terms "roughly" and "basically" have similar meanings to the above.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Cables play a vital role in urban power transmission. With the continuous improvement of economic level, urban overhead lines are gradually replaced by underground cables and internal pipeline cables. The development is particularly obvious in first- and second-tier cities. Power cables run through cities. Their safe, stable and reliable operation is an important factor in the urban energy system. Once a cable failure occurs, it directly affects the work and life of urban residents. Therefore, the safe operation and maintenance of urban cables is crucial. Cables have good mechanical and electrical properties. Most of the failures are caused by the aging of the insulation layer. There are many factors that affect aging, such as the cable material itself, the external operating environment, and human or foreign body damage. Each factor or multiple factors will cause different degrees of cable aging. According to the stress that causes cable insulation aging, it can be roughly divided into thermal aging, electrical aging, water aging, chemical corrosion, mechanical aging, etc., but the root cause is high temperature heating. Continuous high temperature causes thermal aging and insulation aging. The main inducing factors. In this field, researchers from all walks of life have carried out in-depth research and monitoring methods, deployed a large number of monitoring terminals, such as temperature measurement, partial discharge measurement, circulating current measurement, and environmental measurement, and collected a large amount of data to transmit to the remote cable lean management and control platform. The data transmission from the cable side to the platform side has complex environment, ground and underground connection, large interference and other unfavorable characteristics. It is necessary to select a stable and reliable transmission network to support data transmission.

[0027] The communication environment in the cable tunnel exhibits the following six characteristics:

[0028] (1) Superficial: 0.5-1.5 meters underground, with poor sealing, easy to leak, easy to accumulate water, and easy to mold;

[0029] (2) Discontinuous: There are multiple pipe connections in the channel. Generally, the channel is mainly 300-1000 meters long;

[0030] (3) Small volume: Due to the lag in urban construction underground projects, the volume of high-voltage cable channels is generally small, and the space for laying optical fibers is limited;

[0031] (4) Optical and electrical cables share trenches: Cables and optical cables are commonly found in the same trench in the channel, and the competition for channel space resources between cables and optical cables is quite serious;

[0032] (5) Broadband and narrowband compatibility: The transmission system must be able to handle both broadband and narrowband access at the same time;

[0033] (6) Wireless acquisition and control: Whenever possible, wireless networks should be used to collect monitoring data and issue control instructions.

[0034] Based on this, it can be seen that the existing communication solutions in power grid tunnels have the problem of poor stability. To address this problem, wired communication can partially solve the problem, such as optical fiber, Ethernet or carrier mode. However, wired methods for data transmission in tunnels have many disadvantages:

[0035] (1) The installation and construction cost is high. The monitoring device only has a monitoring terminal at the 200-500m node. If the entire line is laid with wires, the transmission cost will be greatly increased.

[0036] (2) The operation and maintenance cost is high. Transmission was originally used only as an auxiliary means. When the entire line was laid, the operation and maintenance team became the focus of monitoring, which led to the phenomenon of putting the cart before the horse.

[0037] (3) The underground environment is harsh. Wired lines are easily damaged by plague, human factors, etc., and wired terminals are easily corroded by humid environments, resulting in line breakage.

[0038] It can be seen that the existing solutions have the problem of not being able to balance communication stability and construction costs. To address this problem, the utility model proposes a wireless ACU system for power grid tunnel corridors. In the traditional ACU communication network, multiple ACU devices are arranged inside the corridor at intervals along the power grid tunnel corridor, and wireless communication is integrated into the construction of the communication link of each ACU device to realize ACU communication networking of wired combined with wireless communication. While adding wireless communication methods to the ACU device, it is also possible to expand the capacity of other access modules, thereby improving the overall supervision performance of the power grid tunnel corridor. The stability of communication within the power grid tunnel corridor is guaranteed by the wired and wireless redundant communication solution.

[0039] Please refer to Figure 1 This embodiment provides a wireless ACU system for a power grid tunnel corridor, and the wireless ACU system for the power grid tunnel corridor comprises: a plurality of ACU devices arranged at intervals inside the corridor along the power grid tunnel corridor; wherein each ACU device is communicatively connected with a corresponding edge IoT proxy device based on wired communication and / or wireless communication; and at least one set of the edge IoT proxy device is deployed at the end of the power grid tunnel corridor.

[0040] In the embodiment of the utility model, the environment in the power grid tunnel corridor is very complex. It passes through different sections, the ground facilities are different, and the corresponding underground environment is also very different. Based on this, even if it is the same cable line, the degree of cable aging is different in different power grid tunnel corridor sections. Based on this, the degree of cable aging in some sections is low, and the corresponding traditional wired ACU communication mode stability can be guaranteed, so the original communication mode can still be used. However, in some sections where the environment is harsh and the communication stability cannot be guaranteed, a wireless or wireless and wired redundant setting solution can be used to make the communication more stable.

[0041] Preferably, the ACU device is an ACU device developed based on modularization.

[0042] In the embodiment of the utility model, the ACU device adopts a modular development model to facilitate the on-demand transformation of the device and meet the customized requirements of field applications. The cable IoT acquisition and transmission device is based on a containerized technical architecture to achieve functions such as protocol analysis, data storage and processing, device information modeling, edge computing, device management and security protection.

[0043] Preferably, the wireless ACU system of the power grid tunnel gallery also includes a plurality of sensors arranged along the power grid tunnel gallery for collecting real-time environmental information within the power grid tunnel gallery.

[0044] Preferably, the ACU device includes multiple communication interfaces.

[0045] In the embodiment of the utility model, communication modes such as optical fiber, wireless and Ethernet are supported; MODBUS RTU, MODBUS ASCII, DL / T645, MODBUS TCP, MQTT and other protocols are supported, and custom protocol programming is supported. The device adopts multiple communication interfaces and security reinforcement to achieve safe and stable data transmission.

[0046] Preferably, the communication interfaces of the ACU device include: R485 interface, AI / DI interface, DO 2A / 24V interface, Gigabit network port, 100M network port, and fiber optic network interface.

[0047] In one possible implementation, it supports 2 industrial R485 interfaces, 8 AI / DI (analog / digital input interfaces), 4 DO 2A / 24V interfaces, 1 Gigabit network port (connected to camera), 4 100M network ports (connected to camera), 2-channel fiber optic network interface (connected to sensor), 1 LPWAN channel and 1 secure Bluetooth (on-site operation and maintenance); remote communication can support 2 fiber optic network interfaces (device cascading, connecting to server).

[0048] Preferably, each sensor is only connected to the ACU device of the corresponding pre-zoned section for communication, and each sensor is connected to the corresponding ACU device based on wired communication and / or wireless communication.

[0049] In the embodiment of the utility model, based on the unified communication protocol and standardized communication interface, reliable access of various sensors is supported through wired (Ethernet, RS485 / AI / DI / DO) or wireless (LPWAN wireless communication module) methods.

[0050] Preferably, the ACU device, the edge IoT agent device and the sensor have the same communication protocol.

[0051] Preferably, each device of the wireless ACU system of the power grid tunnel corridor should have a unified unique identity to enable the high-voltage cable lean management platform to effectively manage the end-side devices and realize online management of the connected status perception terminals, logs, software, etc.

[0052] Preferably, the processor of the ACU device is a SCMZB801A core board.

[0053] In the embodiment of the utility model, the processor of the ACU device is the SCMZB801A core board, which adopts the ARM hardware platform and runs the Linux operating system; the core board SCMZB801A adopts a high-density high-speed circuit board design, 4 cores 32Bit A7 architecture multi-core processor development, main frequency up to 1GHz. Support a variety of peripheral interfaces, including UART, SPI, I2C, ADC, CAN, LCD, 10 / 100 / 1000Mbps MAC, USB, etc. The board integrates processor, DDR, eMMC, power management and other circuits, using 1.3mm spacing stamp hole pad, stable and reliable, with high cost performance, can be widely used in industrial control field.

[0054] Preferably, the ACU device includes: an LPWAN channel and a Bluetooth channel.

[0055] Preferably, the chip of the LPWAN channel is a SCM325 chip.

[0056] In the embodiment of the utility model, the LPWAN wireless communication module adopts the SCM325 chip: the standby current of the wireless communication module is supported to be ≤1μA, the receiving current is 15mA, the maximum transmission power is 20dBm, the receiving sensitivity reaches -138dBm, and the working frequency band is supported to be 400MHz to 510MHz; the module supports ultra-low power consumption mode, supports timed wake-up function, supports air wake-up (CAD) function, supports channel monitoring mode (LBT), supports rate adaptive control mode, supports two-way network access authentication mode, and supports data source encryption function; the hardware architecture of the wireless communication module is shown in the figure Figure 2 As shown in the figure, the main function of the communication module on the sensing side is to build a data transmission link between the sensor and the sideband device through the SubG low-power communication chip. The wireless communication mode should comprehensively consider parameters such as transmission distance, transmission power, power consumption, and air interface transmission rate. The low-rate mode can bring a longer wireless transmission distance, but for wireless temperature sensor products with non-replaceable batteries, a suitable communication rate should be selected. Under the premise of meeting the communication distance requirements, a higher transmission rate can more effectively save communication time and is more conducive to optimizing product power consumption. The microprocessor completes the configuration, drive, and specific implementation of the protocol of each sensor chip. In this product, the device packaging, working current, and standby power consumption should be mainly considered. The communication module should provide a variety of external interfaces to adapt to different sensor modules. The ultra-low leakage current load switch is used to switch the switch of the RF power amplifier chip to reduce the system standby power consumption. The antenna adopts the PATCH end loading solution, so that the antenna forms multiple resonances at adjacent frequency points, thereby increasing the bandwidth and making the antenna have good robustness.

[0057] The optional implementation modes of the embodiments of the utility model are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the utility model are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the utility model, the technical scheme of the embodiments of the utility model can be subjected to various simple modifications, and these simple modifications all belong to the protection scope of the embodiments of the utility model.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the utility model will not further describe various possible combinations.

[0059] In a possible implementation, it is assumed that three types of sensors are connected: temperature and humidity, water immersion, and partial discharge. Three ACUs are deployed (one set is deployed every 200 meters to achieve three levels of remote sensing), one edge IoT agent is deployed (deployed closer to the cable wellhead), and the software part is deployed on the substation monitoring system of the municipal cable company, and data display is achieved through a portable terminal.

[0060] In the embodiment of the utility model, the power cable tunnel is a narrow and long closed space, which can be regarded as a waveguide. Since the operating frequency of the wireless communication equipment is higher than the cutoff frequency of the tunnel waveguide, radio frequency wireless communication can be realized in the tunnel. The rectangular pipe corridor can be regarded as a modified rectangular waveguide, and the propagation of radio waves in the tunnel can be analyzed and studied by superposition of different characteristic modes. Since the power pipe corridor system usually contains a large number of cable harnesses, including power lines, signal lines, and grounding lines, each wire can be regarded as a closed loop composed of input equivalent impedance, output equivalent impedance, and return wire. The interconnected cables outside the transmission equipment housing or chassis are directly exposed to the electromagnetic field, and are most likely to couple electromagnetic energy to generate induced voltage and current signals. The signal enters the equipment through the connecting line to form interference. Therefore, in the development process of this product, the structural characteristics of the tunnel cable environment should be fully considered to realize the reasonable planning of the wireless sensor network in the buried cable scene. The product should have performance requirements such as anti-electromagnetic interference, waterproof and explosion-proof, and stable communication. The cable operation monitoring business mainly includes real-time cable data monitoring and protection, cable fault location, optical fiber temperature measurement system for the cable body and power warehouse, cable stress and deformation monitoring system and cable partial discharge monitoring system, etc. It is mainly responsible for real-time monitoring of transmission cables to ensure the normal operation of cables and quickly locate the fault position after an accident occurs.

[0061] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including a number of instructions to enable a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0062] In addition, various implementations of the embodiments of the present utility model can also be arbitrarily combined, as long as they do not violate the concept of the embodiments of the present utility model, they should also be regarded as the contents disclosed in the embodiments of the present utility model.

Claims

1. A wireless ACU system for a power grid tunnel corridor, characterized in that: The wireless ACU system of the power grid tunnel gallery includes: Multiple ACU devices are arranged at intervals inside the power grid tunnel corridor; among them, Each ACU device and the corresponding edge IoT proxy device are connected to each other through wired communication and / or wireless communication. At least one set of the edge IoT proxy device is deployed at the end of the power grid tunnel corridor.

2. The wireless ACU system for power grid tunnel corridor according to claim 1 is characterized in that: The ACU device is an ACU device developed based on modularization.

3. The wireless ACU system for power grid tunnel corridor according to claim 1 is characterized in that: The wireless ACU system of the power grid tunnel corridor also includes: a plurality of sensors arranged along the power grid tunnel corridor, which are used to collect real-time environmental information in the power grid tunnel corridor.

4. The wireless ACU system for power grid tunnel corridor according to claim 3 is characterized in that: The ACU device includes multiple communication interfaces.

5. The wireless ACU system for power grid tunnel corridor according to claim 4 is characterized in that: The communication interface of the ACU device includes: R485 interface, AI / DI interface, DO 2A / 24V interface, Gigabit network port, 100M network port and fiber optic network interface.

6. The wireless ACU system for power grid tunnel corridor according to claim 3 is characterized in that: Each sensor is only connected to the ACU device of the corresponding pre-zoned section for communication, and each sensor is connected to the corresponding ACU device based on wired communication and / or wireless communication.

7. The wireless ACU system for power grid tunnel corridor according to claim 3 is characterized in that: The ACU device, the edge IoT agent device and the sensor have the same communication protocol.

8. The wireless ACU system for power grid tunnel corridor according to claim 1 is characterized in that: The processor of the ACU device is the SCMZB801A core board.

9. The wireless ACU system for power grid tunnel corridor according to claim 1, characterized in that: The ACU device comprises: LPWAN channel and Bluetooth channel.

10. The wireless ACU system for power grid tunnels and pipe galleries according to claim 9, characterized in that: The chip of the LPWAN channel is the SCM325 chip.

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