CN111917505A - Power transmission line communication system and networking method thereof - Google Patents
Power transmission line communication system and networking method thereof Download PDFInfo
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Abstract
The invention relates to the field of smart power grids and discloses a power transmission line communication system and a networking method thereof. The invention provides a combined communication system based on mixed technologies of SDH/MSTP optical transmission, optical fiber Ethernet, 5.8G wireless private network and the like for an ultra-long-distance power transmission line, and realizes segmented layered convergence, centralized uploading and provincial management of monitoring data. The single chain network structure is changed and optimized into a tree network structure, the robustness of network transmission is enhanced, and the available transmission bandwidth of the monitoring nodes is improved. The number of relay communication equipment on the tower, access communication equipment in the station and safety certification equipment is reduced, and the engineering investment is reduced.
Description
Technical Field
The invention relates to the field of smart power grids, in particular to a communication technology of an ultra-long distance high-voltage transmission line.
Background
The power transmission line state monitoring system is an important component of intelligent power grid construction and is an important means for realizing operation state, information standardization and application networking. A reliable and efficient communication network is an important basis for the operation of such systems.
Through the construction of a power transmission line state monitoring system in China for several years, several mature data communication schemes are formed, and the data communication schemes mainly comprise: a wireless public network, a fiber Ethernet +5.8G wireless private network, an EPON +5.8G wireless private network and the like.
The wireless public network mode is that a GPRS/3G/4G module is installed, communication is carried out by means of public wireless networks of three communication operators, and data are directly transmitted to a system main station. Because the transmission line corridor is often located in the sparsely populated area in the engineering, even part is unmanned area, mountains and hills are more in the topographic condition, and the signal quality of part node public network is poor, so that the full coverage can not be achieved. Even in a public network coverage area, the network bandwidth is shared in a cell, the available bandwidth is unstable, and the overall operation effect and user experience of the system are seriously influenced.
Fiber ethernet +5.8G wireless private network: the optical fiber Ethernet can solve the data transmission problem of the node with the optical fiber access condition, and the single-hop transmission distance can reach 80 km. Meanwhile, the data access problem of the node without the optical fiber access condition in the last kilometer is solved by combining a 5.8G wireless private network. In a conventional ac transmission line, this method is commonly used. However, as the communication devices on the towers are connected in series to form a chain network, the reliability and the availability (average bandwidth) are greatly reduced as the number of nodes is increased. Therefore, the mode of 'optical fiber Ethernet +5.8G wireless private network' is limited by the number of communication devices on the tower, and is indirectly limited by the length of the power transmission line.
EPON +5.8G wireless private network: the backbone communication link adopts EPON (Ethernet passive optical network) and is matched with a 5.8G wireless private network to solve the problem of 'last kilometer' full coverage. The coverage radius of the EPON system is 20km, the maximum optical splitting ratio can be supported by 1:64, the EPON system is suitable for short-distance lines, and the monitoring device is distributed in a dense scene.
According to the characteristics that the length of a high-voltage transmission line of more than 500kV and the transmission line are in a chain shape, the problems of incomplete coverage of public network signals and limited transmission bandwidth are considered, and the current common mode is as follows: fiber Ethernet +5.8G wireless private network. Fig. 1 is a schematic diagram of a communication device of a "fiber ethernet +5.8G wireless private network" in the prior art. As shown in fig. 1, the communication device in the "fiber ethernet +5.8G wireless private network" mode mainly includes an OPGW optical cable installed on a tower, a fiber ethernet switch installed on the tower, a 5.8G wireless private network device, a fiber ethernet switch installed in a substation, and a security authentication device.
However, the dedicated network communication scheme commonly applied to the existing power transmission line state monitoring system, that is, the disadvantages of the "optical fiber ethernet +5.8G wireless dedicated network" are mainly expressed as follows:
(1) all monitoring nodes in the section are connected in series to form a chain-shaped network structure, the safety and reliability can be reduced along with the increase of the number of the nodes, and when a single node fails, the data transmission of other parts of nodes in a link is interrupted;
(2) the chain network structure enables data to be gathered towards one end, the average available bandwidth of each node is greatly reduced along with the increase of the number of the nodes, and the more the number of the nodes is, the smaller the available bandwidth is;
(3) due to the fact that the distribution irregularity of the monitoring nodes is achieved, and the transmission limited distance of an optical interface of the optical fiber Ethernet switch is 80km, extra optical relay equipment on a tower needs to be added, and therefore engineering investment is increased;
(4) due to the special geographical boundaries of the partial areas, the lines of the same province are not physically continuous, leading to two consequences: 1) monitoring node communication equipment of different provinces has relevance, and mutual influence exists, so that later operation and maintenance of lines of each province are not facilitated; 2) monitoring data can be landed at multiple points in the same province, and the complexity of the network back end and the investment of equipment in the station are increased.
For a direct current transmission line with thousands of kilometers and over long distance, monitoring data collected by state monitoring devices arranged on towers along the line need to be transmitted to a main station of a power transmission and transformation state monitoring system of each province, and the requirements and the limits of all aspects of network full coverage, reliability, transmission capacity, engineering investment and the like cannot be met by depending on a single communication mode or a combination of multiple communication modes in the prior art.
Therefore, a novel combined communication method is needed to solve the problem of full coverage of the network and greatly improve the communication reliability and transmission capacity.
Disclosure of Invention
The invention aims to provide a transmission line communication system and a networking method thereof, which fully utilize an SDH/MSTP optical transmission circuit and an optical communication relay station synchronously constructed in an ultra-long distance transmission project, and transmit monitoring data to a detection system main station in a segmented layered convergence and centralized uploading mode, thereby solving the problem of network full coverage, greatly improving the communication reliability and transmission capacity, and reducing the project investment compared with the traditional mode.
In order to solve the technical problem, the embodiment of the invention discloses a transmission line communication system, wherein a transmission line in each administrative area is divided into N sections, and N is an integer greater than 1; the power transmission line communication system in each administrative area includes: an access layer, a convergence layer and a core layer;
the access layer comprises communication nodes of monitoring points arranged in N sections of the power transmission line, adjacent communication nodes in each section are connected in series, and the communication nodes are used for converging monitoring data collected by the state monitoring device to the convergence layer;
the aggregation layer comprises N aggregation sites, adjacent aggregation sites are connected in series through an optical fiber communication circuit, the N aggregation sites correspond to the N sections one by one, and the aggregation sites are used for receiving monitoring data uploaded by communication nodes in the corresponding sections and aggregating the received monitoring data to the core layer;
the core layer comprises a core site, and the core site is used for receiving the data uploaded by the N aggregation sites and uploading the received data to a monitoring system master station of the administrative region.
The embodiment of the invention also discloses a networking method of the power transmission line communication system, which is used for the power transmission line communication system, and the method comprises the following steps:
determining the position and the monitoring type of a monitoring point;
dividing monitoring sections;
selecting a monitoring data aggregation site of each section;
determining a core site for uploading monitoring data;
analyzing the bandwidth requirement from each aggregation site to a core site, and organizing an Ethernet transmission channel carried by an SDH/MSTP optical transmission circuit;
designing a communication transmission scheme and a safety access scheme from a core site to a monitoring system master station;
determining the in-station equipment configuration of each aggregation site and each core site;
determining the configuration and arrangement position of communication equipment on a tower;
the power and battery capacities required by the on-tower communication equipment are calculated and determined.
Compared with the prior art, the implementation mode of the invention has the main differences and the effects that:
the SDH/MSTP optical transmission circuit and the optical communication relay station which are synchronously built in the ultra-long distance power transmission project are fully utilized, and the monitoring data are transmitted to the monitoring system main station in the modes of sectional layered convergence, centralized uploading and provincial management, so that the problem of network full coverage is solved, the communication reliability and the transmission capacity can be greatly improved, and the project investment is reduced compared with the traditional mode.
Furthermore, a single chain network structure is changed and optimized into a tree network structure, so that the robustness of network transmission is enhanced, and the available transmission bandwidth of the monitoring nodes is improved.
Furthermore, the number of relay communication equipment on the tower, access communication equipment in the station and safety certification equipment is reduced, and the engineering investment is reduced.
Furthermore, the discontinuity of the line physical layer of the same province is optimized to be the continuity of the data link layer, so that the monitoring node communication equipment of different provinces does not have relevance, and the problem of multipoint landing of monitoring data in one province is solved.
Drawings
FIG. 1 is a schematic diagram of a communication device of "fiber Ethernet +5.8G wireless private network" in the prior art;
fig. 2 is a schematic structural diagram of a power transmission line communication system according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a power transmission line communication system according to a preferred embodiment of the first embodiment of the present invention;
FIG. 4 is a schematic diagram of Ethernet channel organization of a preferred embodiment of the first embodiment of the invention;
fig. 5 is a schematic flow chart of a networking method of a power transmission line communication system according to a second embodiment of the present invention;
fig. 6 is a schematic flow chart of a networking method of a power transmission line communication system according to a preferred embodiment of the second embodiment of the present invention.
Detailed Description
In the following description, numerous technical details are set forth in order to provide a better understanding of the present application. However, it will be understood by those skilled in the art that the technical solutions claimed in the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
A first embodiment of the present invention relates to a power transmission line communication system. Fig. 2 is a schematic structural diagram of the power transmission line communication system.
In particular, as shown in figure 2,
the power transmission line in each administrative area is divided into N sections, wherein N is an integer greater than 1; the power transmission line communication system in each administrative area includes: an access layer, a convergence layer, and a core layer.
The access layer comprises communication nodes of monitoring points arranged in N sections of the power transmission line, adjacent communication nodes in each section are connected in series, and the communication nodes are used for converging monitoring data collected by the state monitoring device to the convergence layer.
The communication nodes are connected through OPGW optical cables or 5.8G wireless private networks.
OPGW: the Optical Fiber Composite Overhead Ground Wire is characterized in that an Optical Fiber is placed in a Ground Wire of an Overhead high-voltage power transmission line to form an Optical Fiber communication network on the power transmission line, and the structural form has the dual functions of the Ground Wire and communication.
5.8G wireless private network: the wireless transmission technology of a point-to-multipoint and point-to-point networking mode is realized by using an open 5.8GHz public frequency band and adopting technologies such as Orthogonal Frequency Division Multiplexing (OFDM), spread spectrum and the like and an IP-based wireless transmission technology. The 5.8G wireless private network has the advantages of simple signaling protocol, easy realization, low overhead, high frequency spectrum utilization rate, multiple service types, simple and uniform interfaces and easy upgrading, and is suitable for non-connected monitoring data transmission services.
The communication node comprises: the system comprises a fiber Ethernet switch and 5.8G wireless private network equipment which are arranged on a tower.
In this embodiment, preferably, the communication node further includes: and the optical communication relay equipment is arranged on the tower.
And the communication node gathers and uploads the monitoring data to a gathering site of the gathering layer through an optical fiber Ethernet switch or 5.8G wireless special network equipment.
In an access layer, monitoring data is firstly accessed into an optical fiber link of the power transmission line communication system through an optical fiber link and a wireless private network link.
The OPGW optical cable is erected in a split-disc mode, and each optical cable is about 4-5 km, so that the OPGW of each power transmission line is formed by connecting a plurality of optical cables. According to whether the tower where the monitoring point is located is an OPGW optical cable distribution point, the following conditions are divided:
(1) if the tower where the monitoring point is located is an optical cable branch point, 1 optical fiber Ethernet switch is arranged at the tower, and monitoring data of the tower is directly accessed into an optical fiber link;
(2) if the tower where the monitoring point is located is not the optical cable distribution point, 1 5.8G wireless private network device (antenna and control device) is respectively arranged at the tower and the adjacent tower of the optical cable distribution point, monitoring data is transmitted to the tower of the optical cable distribution point in a wireless mode, and 1 optical fiber Ethernet switch is arranged at the tower of the optical cable distribution point to access the data into an optical fiber link;
(3) the monitoring points are adjacent continuous towers, and data can be transmitted in a wireless relay mode, so that the transmission distance of a single-hop wireless link is reduced, and the reliability is improved;
due to the transmission performance limitation of the optical interface of the optical fiber Ethernet switch, the distance of a single-hop optical fiber link does not exceed 80km, and if the distance exceeds the distance, a relay switch needs to be arranged at a proper middle position.
In the embodiments of the present invention, the term "adjacent" means adjacent in geographical position and closest in distance.
The aggregation layer comprises N aggregation sites, adjacent aggregation sites are connected in series through an optical fiber communication circuit, the N aggregation sites correspond to the N sections one by one, and the aggregation sites are used for receiving monitoring data uploaded by communication nodes in the corresponding sections and aggregating the received monitoring data to the core layer.
The gathering station is a transformer substation provided with an optical fiber Ethernet switch and optical transmission equipment.
The aggregation site corresponding to each zone is selected according to the machine room condition and the data network access condition of the optical communication relay station in the zone.
The core layer comprises a core site, and the core site is used for receiving the data uploaded by the N aggregation sites and uploading the received data to a monitoring system master station of the administrative region.
The core site is one of the N aggregation sites. To simplify the communication configuration of the network segment (i.e., the network from the core site to the monitoring system master), each administrative area (e.g., province, city, district, etc.) is basically provided with a core site, and all monitoring data of each segment in the administrative area is centrally uploaded at the core site.
The core site is selected according to the uplink bandwidth of the comprehensive data network, the machine room environment and the equipment power supply condition, and the core site further comprises a safety certification device.
The convergence site is connected with the core site through an Ethernet transmission channel carried by an SDH/MSTP optical transmission circuit, and the core site uploads the received data to a monitoring system main station of the administrative region through the Ethernet transmission channel carried by the power integrated data network.
For the ultra-long distance transmission line engineering, an optical transmission circuit from a sending end station to a receiving end station is usually built, the standard is SDH/MSTP, the speed is 2.5Gb/s, and the optical transmission circuit is used for bearing control protection signals between two end stations. Because the distance between stations is long, a plurality of optical communication relay stations need to be arranged in the middle, the relay station equipment is usually arranged in a transformer substation near the line, and the relay station equipment is connected in series into an optical transmission circuit by transforming the ground wire from the line intersection point to the nearby transformer substation into an OPGW optical cable.
The optical communication relay station amplifies SDH/MSTP optical transmission circuit signals between two end stations in a relay mode, and the SDH/MSTP optical transmission circuit and the relay station are fully utilized to organize Ethernet special line channels between the relay stations and the end stations to serve as transmission channels for monitoring data subsection layering convergence.
The SDH/MSTP optical transmission circuit has multiple protection, the optical interface, the internal cross matrix and the equipment power supply are all configured in a dual mode, the professional machine room environment is better than the outdoor environment, and the equipment reliability is greatly improved compared with the outdoor environment.
In summary, the present application provides a transmission line communication system based on SDH/MSTP optical transmission circuit segmentation, layering, convergence, and centralized uploading for an ultra-long distance transmission line state monitoring system, which not only solves the problem of network full coverage, but also greatly improves the communication reliability and transmission capacity, and reduces the engineering investment compared with the conventional method.
In order to better understand the technical solutions of the present description, the following description is given with reference to a preferred embodiment, in which the details are listed mainly for the sake of understanding and are not intended to limit the scope of the present application.
The preferred embodiment provides a combined communication system combining multiple communication modes for ultra-long-distance power transmission lines, and performs segmented layered convergence, centralized uploading and provincial management on monitoring data.
The ultra-long distance power transmission line mainly refers to a direct current power transmission line, the length of the line can reach more than thousands of kilometers, the longest +/-1100 kV Changji-ancient spring direct current power transmission line in China at present reaches 3300 kilometers, and the power transmission line is routed to six provinces of Xinjiang, Gansu, Ningxia, Shaanxi, Henan and Anhui.
Fig. 3 is a schematic structural diagram of the power transmission line communication system of the partial section of the preferred embodiment.
Specifically, as shown in fig. 3, the transmission line in province a is divided into n sections: section 1-section n, where section n is discontinuous from other sections and a transmission line in another province (province B) is in the middle.
In the access layer, the monitoring node of each section determines an access mode according to whether the tower in which the monitoring node is located is an optical cable distribution point, namely, optical fiber access or wireless access is adopted. Selecting the aggregation site of the monitoring data of the section according to the machine room condition and the data network access condition of the optical communication relay station (S)1、S2…Sn) And monitoring data is converged to a convergence site by a mode of 'optical fiber Ethernet +5.8G wireless private network' (same as figure 1).
On the convergence layer, each convergence site is configured with an SDH/MSTP optical transmission device, and an Ethernet transmission channel carried by an SDH/MSTP optical transmission circuit is organized by utilizing an Ethernet board (a transparent transmission board or a two-layer switching board) configured on the device, so that monitoring data are secondarily concentrated to a data core site. A provinces each convergence station (S)1-Sk+1Substation) monitoring data are uploaded to a core site (S) of province A in a centralized mannerkSubstation), each aggregation station (S) in province Bp-Sp+1Substation) monitoring data are uploaded to a core site (S) of province B in a centralized mannerpA substation). S in province AnThe data gathered by the transformer substation are directly transmitted to the core site of province A through the Ethernet channel without passing through the communication equipment on the line tower of the adjacent province.
On the physical circuit connection layer, the whole line convergence layer S of the transmission line1Transformer substation-SnThe substations are interconnected; on the logic level of data transmission, through SDH network management configuration, a convergence layer SDH transmission circuit can realize A provincial siteAnd the data aggregation of the sites of the province B is independent of the data aggregation of the sites of the province B. The SDH network management is independent operation management and is relatively solidified, so that the provinces can avoid mutual influence and misoperation when operating and managing the provinces monitoring device and the communication device.
The bandwidth of the ethernet transmission channel is estimated according to the monitoring type and the number of monitoring points and is set and adjusted by the SDH/MSTP network management system, and a schematic diagram of the ethernet channel organization (convergence of the convergence layer data at the logical layer) is shown in fig. 4. Wherein, N1-N5 represents the bandwidth capacity between the aggregation site and the core site, and can be configured by the SDH network management system according to the actual demand of the monitoring data. SkThe transformer substation is a province A data core site, SpThe transformer substation is a B province data core site, SnThe substation data can skip the communication device on the B province tower and is transmitted to the S by the SDH circuitk+1And in the transformer substation, the monitoring data is finally gathered to the core site of the province and uploaded in a centralized manner.
And in the core layer, after the monitoring data fall to the ground at the core site, the monitoring data are accessed to the power comprehensive data network through the data security authentication device and then uploaded to the power-saving company power transmission and transformation state monitoring system master station.
As can be seen from the above description, the power transmission line communication system of the present application has the following advantages:
(1) aiming at an ultra-long distance power transmission line (mainly a direct current power transmission line), a combined communication system based on mixed technologies of SDH/MSTP optical transmission, optical fiber Ethernet, 5.8G wireless private network and the like is provided, and monitoring data is segmented and layered to be converged, uploaded in a centralized mode and managed in a provincial mode.
(2) The sectional aggregation of the monitoring data greatly reduces the number of nodes aggregated in a single section, effectively improves the reliability of the optical fiber Ethernet link and also ensures the transmission bandwidth of the monitoring nodes.
(3) The network structure is optimized from a single chain to a tree structure, the convergence layer utilizes an SDH/MSTP optical transmission circuit to realize secondary centralized convergence of monitoring data, the reliability of equipment is greatly improved, and the robustness of a transmission network is enhanced.
(4) The number of relay communication equipment on the tower, access communication equipment in the station and safety certification equipment is reduced, and the engineering investment is reduced.
(5) For the special geographic boundary of a part of regions, the physically discontinuous lines in the same province are realized to be continuous on a data link layer, so that monitoring node communication equipment of different provinces does not have relevance, and the problem of multipoint landing of monitoring data in one province is solved.
It should be noted that, in each system embodiment of the present invention, each module is a logic module, and physically, one logic module may be one physical module, or may be a part of one physical module, or may be implemented by a combination of multiple physical modules, and the physical implementation manner of the logic modules itself is not the most important, and the combination of the functions implemented by the logic modules is the key to solve the technical problem provided by the present invention. Furthermore, in order to highlight the innovative part of the present invention, the above-mentioned system embodiments of the present invention do not introduce modules that are not so closely related to solving the technical problems proposed by the present invention, which does not indicate that no other modules exist in the above-mentioned device embodiments.
The second embodiment of the invention relates to a networking method of a power transmission line communication system, which is used for the power transmission line communication system. Fig. 5 is a flow chart diagram of the networking method of the power transmission line communication system.
Specifically, as shown in fig. 5, the networking method of the power transmission line communication system includes the following steps:
in step 501, the location and type of monitoring of the monitoring point is determined.
And determining the content to be monitored and the arrangement position of the monitoring equipment according to the conditions of landforms, climates, crossed lines, crossed rivers, railways, highways and the like along the power transmission line. The monitoring types include: images/video, tower tilt, conductor aeolian vibration, conductor galloping, microclimate, ice coating, etc.
Thereafter, step 502 is entered to divide the monitoring segment.
And determining section division according to the arrangement of monitoring points, the optical fiber communication circuit and the relay station scheme, and taking the principle of reducing communication equipment on the tower as much as possible. The method comprises the steps of dividing each province/district, and dividing a plurality of sections in each province/district according to the line length, the number of monitoring devices and the distribution points.
Thereafter, step 503 is entered, and a monitoring data aggregation site for each segment is selected.
Step 504 is then entered to determine the core site to monitor for data upload.
To simplify the communication configuration of the network segment (network from core site to monitoring system master), each province/district is basically provided with a data core site, and all monitoring data of the province/district are uploaded in the core site in a centralized manner. The core site is selected from the previous data aggregation sites, the site with large uplink bandwidth of the comprehensive data network is considered preferentially, and conditions such as a machine room environment and equipment power supply are considered simultaneously.
Then, step 505 is entered, and bandwidth requirements from each aggregation site to the core site are analyzed, so as to organize ethernet transmission channels carried by the SDH/MSTP optical transmission circuit.
Thereafter, step 506 is entered, and a core site to monitoring system master station communication transmission scheme and a security access scheme are designed.
Thereafter, step 507 is entered to determine the in-site device configurations of the respective aggregation sites and core sites.
Thereafter, in step 508, the configuration and placement location of the communication equipment on the tower is determined.
The configuration and arrangement positions of communication equipment (optical fiber Ethernet switches and 5.8G wireless private network equipment) on the tower are determined, and the principle of reducing the wireless transmission distance (improving the reliability) as much as possible is taken.
Thereafter, step 509 is entered to computationally determine the power and battery capacities required by the tower-mounted communications equipment to meet the requirements of the regulatory code.
This flow ends thereafter.
It should be noted that the execution order among the steps 501-509 may be changed, and is not necessarily strictly executed according to the flow order shown in fig. 5.
Fig. 6 is a schematic flow chart of a networking method of the power transmission line communication system according to a preferred embodiment of the present invention.
This embodiment is a method embodiment corresponding to the first embodiment, and may be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first embodiment.
The method embodiments of the present invention may be implemented in software, hardware, firmware, etc. Whether the present invention is implemented as software, hardware, or firmware, the instruction code may be stored in any type of computer-accessible memory (e.g., permanent or modifiable, volatile or non-volatile, solid or non-solid, fixed or removable media, etc.). Also, the Memory may be, for example, Programmable Array Logic (PAL), Random Access Memory (RAM), Programmable Read Only Memory (PROM), Read-Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), a magnetic disk, an optical disk, a Digital Versatile Disk (DVD), or the like.
It is to be noted that in the claims and the description of the present patent, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A transmission line communication system is characterized in that a transmission line in each administrative area is divided into N sections, wherein N is an integer greater than 1; the power transmission line communication system in each administrative area includes: an access layer, a convergence layer and a core layer;
the access layer comprises communication nodes of monitoring points arranged in N sections of the power transmission line, adjacent communication nodes in each section are connected in series, and the communication nodes are used for converging monitoring data collected by the state monitoring device to the convergence layer;
the aggregation layer comprises N aggregation sites, adjacent aggregation sites are connected in series through an optical fiber communication circuit, the N aggregation sites correspond to the N sections one by one, and the aggregation sites are used for receiving monitoring data uploaded by communication nodes in the corresponding sections and aggregating the received monitoring data to the core layer;
the core layer comprises a core site, and the core site is used for receiving the data uploaded by the N aggregation sites and uploading the received data to a monitoring system master station of the administrative region.
2. The power transmission line communication system according to claim 1,
the communication nodes are connected through an OPGW optical cable or a 5.8G wireless private network;
the communication node comprises: the system comprises a fiber Ethernet switch and 5.8G wireless private network equipment which are arranged on a tower.
3. The power transmission line communication system according to claim 2, wherein the communication node further comprises: and the optical communication relay equipment is arranged on the tower.
4. The power transmission line communication system according to claim 1, wherein the communication node aggregates the monitoring data to the aggregation site through a fiber ethernet switch or a 5.8G wireless private network device.
5. The power transmission line communication system according to claim 1, wherein the aggregation site is a substation provided with a fiber optic ethernet switch and an optical transmission device.
6. The power transmission line communication system of claim 1, wherein the aggregation site corresponding to each zone is selected according to a machine room condition and a data network access condition of the optical communication relay station in the zone.
7. The power transmission line communication system of claim 1, wherein the core site is one of the N aggregation sites.
8. The power transmission line communication system of claim 1, wherein the core site is selected according to an upstream bandwidth of the integrated data network, a machine room environment, and a device power supply condition, and the core site further comprises a security authentication device.
9. The power transmission line communication system according to claim 1, wherein the aggregation site is connected to the core site through an ethernet transmission channel carried by an SDH/MSTP optical transmission circuit, and the core site uploads the received data to the monitoring system master station of the administrative area through the ethernet transmission channel carried by the power integrated data network.
10. A networking method of a power transmission line communication system, which is used for the power transmission line communication system of any one of claims 1 to 9, and is characterized in that the method comprises the following steps:
determining the position and the monitoring type of a monitoring point;
dividing monitoring sections;
selecting a monitoring data aggregation site of each section;
determining a core site for uploading monitoring data;
analyzing the bandwidth requirement from each aggregation site to a core site, and organizing an Ethernet transmission channel carried by an SDH/MSTP optical transmission circuit;
designing a communication transmission scheme and a safety access scheme from a core site to a monitoring system master station;
determining the in-station equipment configuration of each aggregation site and each core site;
determining the configuration and arrangement position of communication equipment on a tower;
the power and battery capacities required by the on-tower communication equipment are calculated and determined.
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