Power provincial and local clock transmission network timing organization method based on high-reliability multipoint access

Abstract

The invention discloses an electric power provincial and local clock transmission network timing organization method based on high-reliability multipoint access. Constructing a double-ring network multi-point interconnection structure of an inner ring and an outer ring, wherein the inner ring adopts S-shaped multi-region adjustment point interconnection and is borne by a 220kV provincial and regional OTN (Optical Transport Network); an outer ring adopts O-shaped local dispatching second convergent points to be interconnected point by point and is borne by 500kV provincial and local OTN channels, and the two OTN channels are mutually independent. A provincial dispatching is used as a first reference clock, a provincial dispatching standby dispatching is used as a second reference clock, and the first reference clock and the second reference clock serve as provincial primary and standby timing sources respectively; and through the 1 + 1 interconnection between the local adjustment point and the local adjustment second convergent point, the local adjustment point obtains an inner ring primary timing reference and an outer ring standby timing reference, and is switched to the standby when the primary is abnormal. The serial SEC between the adjacent synchronization nodes is controlled to be less than or equal to 8, a single network can perform time service on at most 20 city secondary clocks, and the time service reliability, stability and precision are improved.

Description

Technical Field

[0001] This invention relates to the field of communication engineering design technology, specifically to a timing organization method for a power-saving clock transmission network based on highly reliable multi-point access. Background Technology

[0002] In power communication networks, timing synchronization networks provide a unified time / frequency reference for services such as relay protection, dispatch automation, data acquisition, and control. According to power network design requirements and networking principles, the number of SECs inserted between every two synchronization network node clocks in an extremely long timing reference chain should typically not exceed eight. However, existing transmission systems often employ single-ring, single-chain, tangent-ring, or ring-chain timing organization methods. When a multi-point transmission network fails, the clock network is prone to disconnection, and the maximum number of SECs at the network backbone timing nodes is difficult to exceed 10, hindering further improvements. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides a timing organization method for a power-saving clock transmission network based on highly reliable multi-point access. By fully utilizing the provincial OTN network and its network structure design, the method maximizes the access of secondary clocks at city-level nodes, increasing the number of secondary clocks at these nodes to 20. This achieves a flattened clock network structure, effectively reducing the cumulative error of clock signals during multi-level transmission, improving the stability and accuracy of power-saving clock transmission, and realizing highly reliable timing clock transmission.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a timing organization method for a power grid-based, land-saving clock transmission network based on high-reliability multi-point access, comprising: A provincial-level clock transmission network is constructed, comprising a provincial-level synchronization network node, a provincial-level backup synchronization network node, and multiple municipal-level synchronization network nodes. A timing reference link is provided for the municipal-level synchronization network nodes based on an optical transmission network. The provincial-level clock is the first reference clock within the province, and the provincial-level backup clock is the second reference clock. The primary and backup timing sources of the provincial transmission network are derived from the first reference clock and the second reference clock, respectively. The provincial clock transmission network adopts a dual-ring network multi-point interconnection structure. The dual-ring network includes an inner ring and an outer ring. The inner ring and the outer ring achieve multi-point interconnection through the 1+1 interconnection between the city-side synchronization network node and the corresponding city-level second aggregation point. The primary timing reference for the city-level synchronization network nodes is configured to be the timing clock from the provincial dispatch center, and the primary timing reference is sent to the city-level synchronization network nodes through the inner loop; The backup timing reference for the city-side synchronization network node is configured to be the timing clock from the provincial dispatch backup, and the backup timing reference is sent to the city-side synchronization network node through the outer ring and the 1+1 interconnection link. The primary timing reference for the second aggregation point in the city is a timing clock from the provincial dispatch center, which is transmitted via the inner loop. The backup timing reference for the second aggregation point in the city is a timing clock from the backup dispatch center of the provincial dispatch center, which is transmitted via the outer loop.

[0005] As one possible implementation, the inner ring adopts an S-shaped structure for interconnecting multiple ground control points, while the outer ring adopts an O-shaped structure for interconnecting the second convergence point of the ground control system point by point.

[0006] As one possible implementation, the inner ring is carried on a 220kV provincial OTN optical transmission network, the outer ring is carried on a 500kV provincial OTN optical transmission network, and the network channels of the 220kV provincial OTN optical transmission network and the 500kV provincial OTN optical transmission network are independent of each other.

[0007] As one possible implementation, further, through the dual-ring network multi-point interconnection structure, a single network can simultaneously provide time synchronization for the secondary clocks of up to 20 city-level nodes using a primary and backup primary clock.

[0008] As one possible implementation, the primary timing reference is further distributed using a dual-link S-shaped path, including at least a first primary path extending from the self-inspection-side synchronization network node to multiple ground-level synchronization network nodes via the ground-level synchronization network node 1, and a second primary path extending from the self-inspection-side synchronization network node to the remaining ground-level synchronization network nodes via the ground-level synchronization network node 1.

[0009] As one possible implementation, the backup timing reference is further distributed using a dual-link O-type path, including at least a first backup path that extends point-by-point from the self-inspection backup synchronization network node to multiple ground dispatch second aggregation point synchronization network nodes via the ground dispatch second aggregation point 6 synchronization network node, and a second backup path that extends point-by-point from the self-inspection backup synchronization network node to the remaining ground dispatch second aggregation point synchronization network nodes via the ground dispatch second aggregation point 6 synchronization network node, and is connected to the corresponding ground dispatch synchronization network node through the ground dispatch-ground dispatch second aggregation point channel.

[0010] As one possible implementation, the primary timing reference of the second aggregation point in the prefecture-level city is distributed using a dual-link S-type path, while the backup timing reference of the second aggregation point in the prefecture-level city is distributed using a dual-link O-type path.

[0011] As one possible implementation, the inner ring further adopts an S-shaped structure with multiple ground control points interconnected to form a ring network interconnected as follows: Ground Control 1 SDH-Ground Control 2 SDH-Ground Control 3 SDH-Ground Control 4 SDH-Ground Control 5 SDH, Ground Control 1 SDH-Ground Control 6 SDH-Ground Control 7 SDH-Ground Control 8 SDH-Ground Control 9 SDH-Ground Control 10 SDH; the inner ring network is interconnected with the provincial control SDH network through Ground Control 1 SDH. The outer ring adopts an O-type structure and a point-by-point interconnection method of the second convergence points of the ground dispatching system, forming a ring network interconnected as follows: Second convergence point 6SDH - Second convergence point 5SDH - Second convergence point 4SDH - Second convergence point 3SDH - Second convergence point 2SDH, Second convergence point 6SDH - Second convergence point 7SDH - Second convergence point 8SDH - Second convergence point 9SDH - Second convergence point 10SDH - Second convergence point 1SDH; The outer ring network is interconnected with the provincial dispatching backup SDH network through the second convergence point 6SDH. The inner and outer rings are interconnected through a 1+1 connection between local survey and the second convergence point of the local survey.

[0012] As one possible implementation, the main clock routing for each regional dispatch center adopts an inner-loop channel path, using the provincial dispatch center's timing clock as the main timing reference. The following is a dual-link S-shaped path routing: a) Main clock path 1: Provincial clock → Provincial SDH → Ground 1 SDH → Ground 2 SDH → Ground 3 SDH → Ground 4 SDH → Ground 5 SDH; b) Main clock path 2: Provincial clock → Provincial SDH → Ground 1 SDH → Ground 6 SDH → Ground 7 SDH → Ground 8 SDH → Ground 9 SDH → Ground 10 SDH; The backup clocks for each dispatch center adopt an outer loop path, passing through the dispatch center-dispatch center second convergence point channel, with the provincial dispatch center's backup timing clock as the primary and backup timing reference. The following is a dual-link O-type path: c) Backup clock path 1: Provincial dispatch backup clock → Provincial dispatch backup SDH → Ground dispatch second convergence point 6 SDH (→ Ground dispatch 6 SDH) → Ground dispatch second convergence point 5 (→ Ground dispatch 5 SDH) → Ground dispatch second convergence point 4 (→ Ground dispatch 4 SDH) → Ground dispatch second convergence point 3 (→ Ground dispatch 3 SDH) → Ground dispatch second convergence point 2 (→ Ground dispatch 2 SDH); d) Backup clock path 2: Provincial dispatch backup clock → Provincial dispatch backup SDH → Ground dispatch second convergence point 6 SDH (→ Ground dispatch 6 SDH) → Ground dispatch second convergence point 7 (→ Ground dispatch 7 SDH) → Ground dispatch second convergence point 8 (→ Ground dispatch 8 SDH) → Ground dispatch second convergence point 9 (→ Ground dispatch 9 SDH) → Ground dispatch second convergence point 10 (→ Ground dispatch 10 SDH) → Ground dispatch second convergence point 1 (→ Ground dispatch 1 SDH); The primary clock routing at each local dispatching second convergence point adopts an inner-loop channel path, using the provincial dispatching timer clock as the primary timing reference. The following is a dual-link S-shaped path routing: A) Main clock path 1: Provincial clock → Provincial SDH → Ground clock 1 SDH (→ Ground clock second convergence point 1 SDH) → Ground clock 2 SDH (→ Ground clock second convergence point 2 SDH) → Ground clock 3 SDH (→ Ground clock second convergence point 3 SDH) → Ground clock 4 SDH (→ Ground clock second convergence point 4 SDH) → Ground clock 5 SDH (→ Ground clock second convergence point 5 SDH); B) Main clock path 2: Provincial clock → Provincial clock SDH → Ground clock 1 SDH (→ Ground clock second convergence point 1 SDH) → Ground clock 6 SDH (→ Ground clock second convergence point 6 SDH) → Ground clock 7 SDH (→ Ground clock second convergence point 7 SDH) → Ground clock 8 SDH (→ Ground clock second convergence point 8 SDH) → Ground clock 9 SDH (→ Ground clock second convergence point 9 SDH) → Ground clock 10 SDH (→ Ground clock second convergence point 10 SDH); The backup clock routing at the second convergence point of each dispatch center adopts an outer loop channel path, using the provincial dispatch backup timing clock as the primary and backup timing reference. The following is a dual-link O-type path routing: C) Backup clock path 1: Provincial dispatch backup clock → Provincial dispatch backup SDH → Ground dispatch second convergence point 6 SDH → Ground dispatch second convergence point 5 SDH → Ground dispatch second convergence point 4 SDH → Ground dispatch second convergence point 3 SDH → Ground dispatch second convergence point 2SDH; D) Backup clock path 2: Provincial dispatch backup clock → Provincial dispatch backup SDH → Ground dispatch second convergence point 6 SDH → Ground dispatch second convergence point 7 SDH → Ground dispatch second convergence point 8 SDH → Ground dispatch second convergence point 9 SDH → Ground dispatch second convergence point 10 SDH → Ground dispatch second convergence point 1 SDH.

[0013] As a possible implementation, further, based on the design constraints of the extremely long timing reference chain, the number of SECs inserted between every two synchronization network node clocks is controlled to be within 8.

[0014] The beneficial effects of this invention are as follows: 1. In the present invention, a single network can simultaneously provide timing to up to 20 secondary clocks of primary and backup primary clocks. At the same time, by reasonably controlling the number of SEC (synchronization device clock) inputs, the cumulative error of clock signals in multi-level transmission can be effectively reduced, thus meeting the higher precision requirements of power services.

[0015] 2. This invention makes full use of provincial and municipal OTN network topology, adopts a flat networking structure to reduce intermediate nodes and simplify network hierarchy, and allows municipal nodes to directly establish clock links with provincial core nodes, reducing intermediate forwarding links. This not only reduces the probability of failure, but also makes subsequent operation and maintenance and fault location more efficient.

[0016] 3. In the present invention, all local dispatching stations and the second convergence point of the local dispatching station adopt a 1+1 interconnection method, increase the inner and outer ring connection nodes, provide multiple timed connection channels between local dispatching stations and the second convergence point of the local dispatching station, improve the reliability, stability and accuracy of provincial and local power clock transmission, resist the clock network disconnection caused by multi-point transmission network failure, and improve the network's risk resistance capability.

[0017] 4. The timing network design of this invention adopts a dual-ring network multi-point interconnection structure. The inner and outer ring network structures and optical path directions are independent of each other, which is conducive to making full use of different optical cable routes in the province and ensuring that the timing clock direction is completely independent and carried on two completely independent transmission networks. Attached Figure Description

[0018] Figure 1 This is a timing diagram for a dual-ring, multi-point interconnected structure. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides a timing organization method for a power grid-based, land-saving clock transmission network with high-reliability multi-point access, comprising: A provincial-level clock transmission network is constructed, comprising a provincial-level synchronization network node, a provincial-level backup synchronization network node, and multiple municipal-level synchronization network nodes. A timing reference link is provided for the municipal-level synchronization network nodes based on an optical transmission network. The provincial-level clock is the first reference clock within the province, and the provincial-level backup clock is the second reference clock. The primary and backup timing sources of the provincial transmission network are derived from the first reference clock and the second reference clock, respectively. The provincial clock transmission network adopts a dual-ring network multi-point interconnection structure. The dual-ring network includes an inner ring and an outer ring. The inner and outer rings achieve multi-point interconnection through a 1+1 interconnection between the city-level synchronization network nodes and the corresponding city-level second aggregation points. The inner ring adopts an S-shaped structure for multi-location adjustment point interconnection, while the outer ring adopts an O-shaped structure for point-to-point interconnection of the city-level second aggregation points. The inner ring is carried by the 220kV provincial OTN optical transmission network, and the outer ring is carried by the 500kV provincial OTN optical transmission network. The network channels of the 220kV and 500kV provincial OTN optical transmission networks are independent of each other. Through the dual-ring network multi-point interconnection structure, a single network can simultaneously provide time synchronization for the secondary clocks of up to 20 city-level nodes using a primary and backup primary clock.

[0021] The primary timing reference for the city-side synchronization network node is configured to be the timing clock from the provincial dispatch center, and the primary timing reference is sent to the city-side synchronization network node through the inner loop; the backup timing reference for the city-side synchronization network node is configured to be the timing clock from the backup dispatch center of the provincial dispatch center, and the backup timing reference is sent to the city-side synchronization network node through the outer loop and the 1+1 interconnection link. The primary timing reference for the second aggregation point in the city is a timing clock from the provincial dispatch center, which is transmitted via the inner loop. The backup timing reference for the second aggregation point in the city is a timing clock from the backup dispatch center of the provincial dispatch center, which is transmitted via the outer loop.

[0022] The primary timing reference is distributed using a dual-link S-shaped path, comprising at least a first primary path extending from the provincial dispatch synchronization network node to multiple regional dispatch synchronization network nodes via the regional dispatch 1 synchronization network node, and a second primary path extending from the provincial dispatch synchronization network node to the remaining regional dispatch synchronization network nodes via the regional dispatch 1 synchronization network node. The backup timing reference is distributed using a dual-link O-shaped path, comprising at least a first backup path extending from the provincial dispatch backup synchronization network node to multiple regional dispatch second aggregation point synchronization network nodes point-by-point, and a second backup path extending from the provincial dispatch backup synchronization network node to the remaining regional dispatch second aggregation point synchronization network nodes point-by-point, and connected to the corresponding regional dispatch synchronization network node via the regional dispatch-regional dispatch second aggregation point channel. The primary timing reference at the municipal second aggregation point is distributed using a dual-link S-shaped path, while the backup timing reference at the municipal second aggregation point is distributed using a dual-link O-shaped path. Furthermore, based on the design constraints of the extremely long timing reference chain, the number of SECs inserted between every two synchronization network node clocks is controlled to be within 8.

[0023] Example 1 See attached document Figure 1 As shown, this embodiment provides a timing organization method for a power-saving clock transmission network based on highly reliable multi-point access. Unlike existing common networks, the timing network design in this embodiment adopts a dual-ring network multi-point interconnection structure.

[0024] The inner ring adopts an S-shaped structure with multiple local control points interconnected, forming a ring network of interconnected local control points: Local Control Point 1 SDH-Local Control Point 2 SDH-Local Control Point 3 SDH-Local Control Point 4 SDH-Local Control Point 5 SDH and Local Control Point 1 SDH-Local Control Point 6 SDH-Local Control Point 7 SDH-Local Control Point 8 SDH-Local Control Point 9 SDH-Local Control Point 10 SDH. The inner ring network is interconnected with the provincial control point SDH network through Local Control Point 1 SDH. To reduce the overall network latency, the number of SECs inserted between the clocks of the two synchronization network nodes is controlled to within 8 nodes, and the local control point interconnected SDH network is carried on the 220kV provincial OTN optical transmission network.

[0025] The outer ring adopts an O-type structure and a point-to-point interconnection method for the second aggregation point of the dispatch center, forming a daisy-chain interconnection of the second aggregation point 6 SDH-second aggregation point 5 SDH-second aggregation point 4 SDH-second aggregation point 3 SDH-second aggregation point 2SDH and the second aggregation point 6 SDH-second aggregation point 7 SDH-second aggregation point 8 SDH-second aggregation point 9 SDH-second aggregation point 10 SDH-second aggregation point 1 SDH ring network. The outer ring network is interconnected with the provincial dispatch backup SDH network through the second aggregation point 6 SDH. To reduce the overall network latency, the number of SECs inserted between the clocks of the two synchronization network nodes is controlled to within 8 nodes. The SDH network interconnected by the second aggregation points of the dispatch center is carried on the 500kV provincial OTN optical transmission network; the network channels of the 220kV provincial OTN optical transmission network and the 500kV provincial OTN optical transmission network are independent of each other.

[0026] The inner and outer rings are interconnected through a 1+1 connection between local survey centers and the second convergence point of the local survey center.

[0027] The timing clocks are arranged as follows: the provincial dispatch center serves as the primary reference clock for the province, and the provincial dispatch backup center serves as the secondary reference clock. The primary and backup timing sources for the provincial transmission network should originate from the primary and secondary reference clocks within the province. The regional dispatch center serves as the primary clock source for the municipal transmission network, and the municipal second aggregation point serves as the backup reference clock source for the municipal transmission network. The primary and backup timing sources for the regional dispatch center and the municipal second aggregation point should originate from the provincial dispatch center and the provincial dispatch backup center, respectively.

[0028] 1. Local dispatching timer clock routing: The main clock routing for each local dispatching system adopts an inner loop channel path, using the provincial dispatching timer clock as the main timing reference. The following is a dual-link S-shaped path routing: a) Main clock path 1: Provincial clock → Provincial SDH → Ground 1 SDH → Ground 2 SDH → Ground 3 SDH → Ground 4 SDH → Ground 5 SDH; b) Main clock path 2: Provincial clock → Provincial SDH → Ground 1 SDH → Ground 6 SDH → Ground 7 SDH → Ground 8 SDH → Ground 9 SDH → Ground 10 SDH; The backup clocks for each dispatch center adopt an outer loop path, passing through the dispatch center-dispatch center second convergence point channel, with the provincial dispatch center's backup timing clock as the primary and backup timing reference. The following is a dual-link O-type path: c) Backup clock path 1: Provincial dispatch backup clock → Provincial dispatch backup SDH → Ground dispatch second convergence point 6 SDH (→ Ground dispatch 6 SDH) → Ground dispatch second convergence point 5 (→ Ground dispatch 5 SDH) → Ground dispatch second convergence point 4 (→ Ground dispatch 4 SDH) → Ground dispatch second convergence point 3 (→ Ground dispatch 3 SDH) → Ground dispatch second convergence point 2 (→ Ground dispatch 2 SDH); d) Backup clock path 2: Provincial dispatch backup clock → Provincial dispatch backup SDH → Ground dispatch second convergence point 6 SDH (→ Ground dispatch 6 SDH) → Ground dispatch second convergence point 7 (→ Ground dispatch 7 SDH) → Ground dispatch second convergence point 8 (→ Ground dispatch 8 SDH) → Ground dispatch second convergence point 9 (→ Ground dispatch 9 SDH) → Ground dispatch second convergence point 10 (→ Ground dispatch 10 SDH) → Ground dispatch second convergence point 1 (→ Ground dispatch 1 SDH).

[0029] 2. Timing clock routing at the second convergence point of the regional dispatch: The main clock routing at each second convergence point of the regional dispatch adopts an inner loop channel path, using the provincial dispatch timing clock as the main timing reference. The following is a dual-link S-shaped path routing: A) Main clock path 1: Provincial clock → Provincial SDH → Ground clock 1 SDH (→ Ground clock second convergence point 1 SDH) → Ground clock 2 SDH (→ Ground clock second convergence point 2 SDH) → Ground clock 3 SDH (→ Ground clock second convergence point 3 SDH) → Ground clock 4 SDH (→ Ground clock second convergence point 4 SDH) → Ground clock 5 SDH (→ Ground clock second convergence point 5 SDH); B) Main clock path 2: Provincial clock → Provincial clock SDH → Ground clock 1 SDH (→ Ground clock second convergence point 1 SDH) → Ground clock 6 SDH (→ Ground clock second convergence point 6 SDH) → Ground clock 7 SDH (→ Ground clock second convergence point 7 SDH) → Ground clock 8 SDH (→ Ground clock second convergence point 8 SDH) → Ground clock 9 SDH (→ Ground clock second convergence point 9 SDH) → Ground clock 10 SDH (→ Ground clock second convergence point 10 SDH); The backup clock routing at the second convergence point of each dispatch center adopts an outer loop channel path, using the provincial dispatch backup timing clock as the primary and backup timing reference. The following is a dual-link O-type path routing: C) Backup clock path 1: Provincial dispatch backup clock → Provincial dispatch backup SDH → Ground dispatch second convergence point 6 SDH → Ground dispatch second convergence point 5 SDH → Ground dispatch second convergence point 4 SDH → Ground dispatch second convergence point 3 SDH → Ground dispatch second convergence point 2SDH; D) Backup clock path 2: Provincial dispatch backup clock → Provincial dispatch backup SDH → Ground dispatch second convergence point 6 SDH → Ground dispatch second convergence point 7 SDH → Ground dispatch second convergence point 8 SDH → Ground dispatch second convergence point 9 SDH → Ground dispatch second convergence point 10 SDH → Ground dispatch second convergence point 1 SDH.

[0030] In summary, the timing network design of this invention adopts a dual-ring network multi-point interconnection structure. A single network can simultaneously provide timing to up to 20 secondary clocks on the primary and backup levels. By reasonably controlling the number of SEC (synchronization device clock) inputs, the cumulative error of clock signals in multi-level transmission can be effectively reduced, meeting the higher precision requirements of power services.

[0031] The inner ring adopts an S-shaped structure with multiple local control points interconnected. The SDH network interconnected by these local control points carries the 220kV provincial OTN optical transmission network. The outer ring adopts an O-shaped structure with multiple local control point second aggregation points interconnected point-to-point. The SDH network interconnected by these local control point second aggregation points carries the 500kV provincial OTN optical transmission network. The network channels of the 220kV and 500kV provincial OTN optical transmission networks are independent, and the inner and outer ring network structures and optical path directions are also independent. This facilitates the full utilization of different optical cable routes within the province, ensures completely independent timing clock paths, and carries the signal on two completely independent transmission networks.

[0032] All local dispatch centers and their second aggregation points adopt a 1+1 interconnection method, increasing the number of inner and outer ring connection nodes and providing multiple timed connection channels between local dispatch centers and their second aggregation points. This improves the reliability, stability, and accuracy of provincial and local power clock transmission, and can resist clock network disconnection caused by multi-point transmission network failures, thereby enhancing the network's resilience.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A timing organization method for a power grid clock transmission network based on high-reliability multi-point access, characterized in that, include: A provincial-level clock transmission network is constructed, comprising a provincial-level synchronization network node, a provincial-level backup synchronization network node, and multiple municipal-level synchronization network nodes. A timing reference link is provided for the municipal-level synchronization network nodes based on an optical transmission network. The provincial-level clock is the first reference clock within the province, and the provincial-level backup clock is the second reference clock. The primary and backup timing sources of the provincial transmission network are derived from the first reference clock and the second reference clock, respectively. The provincial clock transmission network adopts a dual-ring network multi-point interconnection structure. The dual-ring network includes an inner ring and an outer ring. The inner ring and the outer ring achieve multi-point interconnection through the 1+1 interconnection between the city-side synchronization network node and the corresponding city-level second aggregation point. The primary timing reference for the city-level synchronization network nodes is configured to be the timing clock from the provincial dispatch center, and the primary timing reference is sent to the city-level synchronization network nodes through the inner loop; The backup timing reference for the city-side synchronization network node is configured to be the timing clock from the provincial dispatch backup, and the backup timing reference is sent to the city-side synchronization network node through the outer ring and the 1+1 interconnection link. The primary timing reference for the second aggregation point in the city is a timing clock from the provincial dispatch center, which is transmitted via the inner loop. The backup timing reference for the second aggregation point in the city is a timing clock from the backup dispatch center of the provincial dispatch center, which is transmitted via the outer loop.

2. The timing organization method for a power grid-based, land-saving clock transmission network based on highly reliable multi-point access as described in claim 1, characterized in that, The inner ring adopts an S-shaped structure for interconnecting multiple ground control points, while the outer ring adopts an O-shaped structure for interconnecting the second convergence point of the ground control system point by point.

3. The timing organization method for a power grid-based, land-saving clock transmission network based on high-reliability multi-point access as described in claim 1 or 2, characterized in that, The inner ring is carried by the 220kV provincial OTN optical transmission network, and the outer ring is carried by the 500kV provincial OTN optical transmission network. The network channels of the 220kV provincial OTN optical transmission network and the 500kV provincial OTN optical transmission network are independent of each other.

4. The timing organization method for a power grid-based, land-saving clock transmission network based on highly reliable multi-point access as described in claim 1, characterized in that, Through the dual-ring network multi-point interconnection structure, a single network enables the primary and backup clocks to simultaneously provide time synchronization to the secondary clocks of up to 20 city-level nodes.

5. The timing organization method for a power grid-based, land-saving clock transmission network based on highly reliable multi-point access according to claim 2, characterized in that, The primary timing reference is distributed using a dual-link S-shaped path, including at least a first primary path extending from the self-inspection and dispatching side synchronization network node to multiple ground dispatching and dispatching network nodes via the ground dispatching 1 synchronization network node, and a second primary path extending from the self-inspection and dispatching side synchronization network node to the remaining ground dispatching and dispatching network nodes via the ground dispatching 1 synchronization network node.

6. The timing organization method for a power grid-based, land-saving clock transmission network based on highly reliable multi-point access as described in claim 5, characterized in that, The backup timing reference is distributed using a dual-link O-type path, including at least a first backup path that extends point-by-point from the self-inspection backup synchronization network node to multiple ground dispatch second aggregation point synchronization network nodes via the ground dispatch second aggregation point 6 synchronization network node, and a second backup path that extends point-by-point from the self-inspection backup synchronization network node to the remaining ground dispatch second aggregation point synchronization network nodes via the ground dispatch second aggregation point 6 synchronization network node, and is connected to the corresponding ground dispatch synchronization network node through the ground dispatch-ground dispatch second aggregation point channel.

7. The timing organization method for a power grid-based, land-saving clock transmission network based on highly reliable multi-point access according to claim 1, characterized in that, The primary timing reference for the second aggregation point in the prefecture-level city is issued using a dual-link S-type path, while the backup timing reference for the second aggregation point in the prefecture-level city is issued using a dual-link O-type path.

8. The timing organization method for a power grid-based, land-saving clock transmission network based on highly reliable multi-point access as described in claim 6, characterized in that, The inner ring adopts an S-shaped structure with multiple local control points interconnected, forming a ring network interconnected as follows: Local Control 1 SDH-Local Control 2 SDH-Local Control 3 SDH-Local Control 4 SDH-Local Control 5 SDH, Local Control 1 SDH-Local Control 6 SDH-Local Control 7 SDH-Local Control 8 SDH-Local Control 9 SDH-Local Control 10 SDH; the inner ring network is interconnected with the provincial control SDH network through Local Control 1 SDH. The outer ring adopts an O-type structure and a point-by-point interconnection method of the second convergence points of the ground dispatching system, forming a ring network interconnected as follows: Ground dispatching second convergence point 6 SDH - Ground dispatching second convergence point 5 SDH - Ground dispatching second convergence point 4 SDH - Ground dispatching second convergence point 3 SDH - Ground dispatching second convergence point 2SDH, Ground dispatching second convergence point 6 SDH - Ground dispatching second convergence point 7 SDH - Ground dispatching second convergence point 8 SDH - Ground dispatching second convergence point 9 SDH - Ground dispatching second convergence point 10 SDH - Ground dispatching second convergence point 1 SDH; The outer ring network is interconnected with the provincial dispatching backup SDH network through the second convergence point of the ground dispatching system 6 SDH. The inner and outer rings are interconnected through a 1+1 connection between local survey and the second convergence point of the local survey.

9. The timing organization method for a power grid-based, land-saving clock transmission network based on highly reliable multi-point access as described in claim 8, characterized in that, The main clocks used by various regional dispatch centers adopt an inner-loop channel path, with the provincial dispatch center's timing clock serving as the main timing reference. The following is a dual-link S-shaped path: a) Main clock path 1: Provincial clock → Provincial SDH → Ground 1 SDH → Ground 2 SDH → Ground 3 SDH → Ground 4 SDH → Ground 5 SDH; b) Main clock path 2: Provincial clock → Provincial SDH → Ground 1 SDH → Ground 6 SDH → Ground 7 SDH → Ground 8 SDH → Ground 9 SDH → Ground 10 SDH; The backup clocks for each dispatch center adopt an outer loop path, passing through the dispatch center-dispatch center second convergence point channel, with the provincial dispatch center's backup timing clock as the primary and backup timing reference. The following is a dual-link O-type path: c) Backup clock path 1: Provincial dispatch backup clock → Provincial dispatch backup SDH → Ground dispatch second convergence point 6 SDH (→ Ground dispatch 6 SDH) → Ground dispatch second convergence point 5 (→ Ground dispatch 5 SDH) → Ground dispatch second convergence point 4 (→ Ground dispatch 4 SDH) → Ground dispatch second convergence point 3 (→ Ground dispatch 3 SDH) → Ground dispatch second convergence point 2 (→ Ground dispatch 2 SDH); d) Backup clock path 2: Provincial dispatch backup clock → Provincial dispatch backup SDH → Ground dispatch second convergence point 6 SDH (→ Ground dispatch 6 SDH) → Ground dispatch second convergence point 7 (→ Ground dispatch 7 SDH) → Ground dispatch second convergence point 8 (→ Ground dispatch 8 SDH) → Ground dispatch second convergence point 9 (→ Ground dispatch 9 SDH) → Ground dispatch second convergence point 10 (→ Ground dispatch 10 SDH) → Ground dispatch second convergence point 1 (→ Ground dispatch 1 SDH); The primary clock routing at each local dispatching second convergence point adopts an inner-loop channel path, using the provincial dispatching timer clock as the primary timing reference. The following is a dual-link S-shaped path routing: A) Main clock path 1: Provincial clock → Provincial SDH → Ground clock 1 SDH (→ Ground clock second convergence point 1 SDH) → Ground clock 2 SDH (→ Ground clock second convergence point 2 SDH) → Ground clock 3 SDH (→ Ground clock second convergence point 3 SDH) → Ground clock 4 SDH (→ Ground clock second convergence point 4 SDH) → Ground clock 5 SDH (→ Ground clock second convergence point 5 SDH); B) Main clock path 2: Provincial clock → Provincial SDH → Ground clock 1 SDH (→ Ground clock second convergence point 1 SDH) → Ground clock 6 SDH (→ Ground clock second convergence point 6 SDH) → Ground clock 7 SDH (→ Ground clock second convergence point 7 SDH) → Ground clock 8 SDH (→ Ground clock second convergence point 8 SDH) → Ground clock 9 SDH (→ Ground clock second convergence point 9 SDH) → Ground clock 10 SDH (→ Ground clock second convergence point 10 SDH); The backup clock routing at the second convergence point of each dispatch center adopts an outer loop channel path, using the provincial dispatch backup timing clock as the primary and backup timing reference. The following is a dual-link O-type path routing: C) Backup clock path 1: Provincial dispatch backup clock → Provincial dispatch backup SDH → Ground dispatch second convergence point 6 SDH → Ground dispatch second convergence point 5 SDH → Ground dispatch second convergence point 4 SDH → Ground dispatch second convergence point 3 SDH → Ground dispatch second convergence point 2 SDH; D) Backup clock path 2: Provincial dispatch backup clock → Provincial dispatch backup SDH → Ground dispatch second convergence point 6 SDH → Ground dispatch second convergence point 7 SDH → Ground dispatch second convergence point 8 SDH → Ground dispatch second convergence point 9 SDH → Ground dispatch second convergence point 10 SDH → Ground dispatch second convergence point 1 SDH.

10. The timing organization method for a power grid-based, land-saving clock transmission network based on highly reliable multi-point access as described in claim 9, characterized in that, Based on the design constraints of the extremely long timing reference chain, the number of SECs inserted between every two synchronization network node clocks is controlled to be no more than 8.

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