Gridding smooth evolution method for power terminal communication access network based on dual-channel switch

Abstract

The invention discloses a gridding smooth evolution method for a power terminal communication access network based on a dual-channel switch, and the method achieves the interconnection and intercommunication of a newly-built dual-channel switch and a stock single-channel industrial Ethernet network through the hybrid networking of a dual-channel industrial Ethernet switch and an existing single-channel switch. The method is favorable for supporting the power communication service that the power communication service should be over-connected, gradual cutover is carried out under the condition that the service operation is not influenced, the cutover time limit is prolonged, one piece of mature cutover is carried out, and the construction operation and maintenance difficulty is reduced. Meanwhile, a power terminal communication access network can be smoothly evolved from a single-channel switch to a dual-channel switch in a gridding mode, continuous extension of a large-span ultra-long-chain network is avoided, smooth evolution of a stock network is achieved, meanwhile, a network architecture is optimized, the anti-risk capacity of the network is improved, and the method is suitable for further application and popularization.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power communication engineering, and in particular to a grid-based smooth evolution method for an electric power terminal communication access network based on a dual-channel switch. Background Art

[0002] With the continuous construction of new business projects such as intelligent auxiliary monitoring stations in distribution stations, a large amount of non-control data with large traffic volume is connected to the distribution communication network, which squeezes the bandwidth of existing control data. In some areas, situations that affect the delay of control data may occur. Therefore, it is necessary to build a corresponding dual-channel distribution communication network to divert non-control data flows such as intelligent construction business monitoring of substations to ensure the reliability and timeliness of control data of the existing distribution communication network and improve power supply reliability.

[0003] The dual-channel switch adopts a chip hard isolation architecture to solve the physical isolation problem at the switch level. At the same time, it adopts CWDM (coarse wavelength division multiplexing) technology in link forwarding, and realizes physical isolation of the link by forwarding at different wavelengths on a pair of physical optical fibers. It is suitable for dual-channel service access in the power terminal communication network scenario.

[0004] Since the existing 10kV distribution network generally has many nodes and the line length can reach 2-5km, even if it is gradually cut over according to the single feeder, the terminals involved will reach 20-60. The existing network transformation mostly adopts one-time replacement and transformation of equipment, which often has a large business cutover area and great pressure on construction and operation and maintenance, causing a large area of ​​three-remote terminals to be disconnected from the network, reducing the fault recovery capability of the power grid, affecting the power supply reliability of the power grid and the production and living electricity consumption of end users. At the same time, due to the diverse sources of funds for distribution projects, there are many projects under construction at the same time, and single-channel and dual-channel equipment cannot achieve color light intercommunication. After a one-time color light transformation, some single-channel approved equipment will not be able to meet the access requirements. Summary of the invention

[0005] In response to the above-mentioned problems, the present invention provides a grid-based smooth evolution method for a power terminal communication access network based on a dual-channel switch. By utilizing a hybrid networking of a dual-channel industrial Ethernet switch and an existing single-channel switch, the newly built dual-channel switch and the existing single-channel industrial Ethernet network can be interconnected and gradually cut over without affecting business operations. At the same time, the power terminal communication access network can be smoothly evolved from a single-channel switch to a dual-channel switch in a grid-based manner, avoiding the continued extension of a large-span and ultra-long chain network, achieving the smooth evolution of the existing network while optimizing the network architecture and improving the network's risk resistance.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a grid-based smooth evolution method for a power terminal communication access network based on a dual-channel switch, comprising:

[0008] 1): Grid the 10kV feeder into several grid segments;

[0009] 2): Grid connection according to the grid feeder segments at each level;

[0010] 3): Replace the dual-channel switches one by one in the grid.

[0011] As a possible implementation, further, step 1) specifically includes:

[0012] The 10kV feeder is gridded into n (n≥3) grid segments, and the n grid segments are numbered sequentially; wherein, the grid division of the 10kV communication network is the same as the grid requirements of the regional power grid.

[0013] As a possible implementation, further, step 2) specifically includes the following steps:

[0014] 2.1): Disconnect the first grid section in the 10kV feeder from the rest of the grids, and build a 24-core optical cable to the nearest nodes of the substation A ring and the substation B chain in the first grid section. At the same time, open the substation A ring to the original second loop optical cable of the substation to achieve integrated networking with the substation A ring and substation B chain;

[0015] When renovating the first grid segment, the second grid segment network in the 10kV feeder is connected to the existing nearby substation B sub-ring or sub-chain through a newly built optical cable;

[0016] In the extended section of the optical cable, the synchronous access of the incremental power distribution facilities can be realized. The access equipment adopts a dual-channel switch, which is networked with the single-channel switch using gray light. The optical cable cores use 1 and 2 cores.

[0017] 2.2): Disconnect the second grid section in the 10kV feeder from the rest of the grids, and build a 24-core optical cable to the substation A ring in the second grid section. At the same time, open the substation A ring to the original second loop optical cable of the substation to achieve integrated networking with the substation A ring;

[0018] When renovating the second grid segment, the third grid segment network in the 10kV feeder is connected to the existing nearby substation B sub-ring or sub-chain through a newly built optical cable;

[0019] 2.3) According to the reconnection method in step 2.2), the n-1 grid segments are reconnected. In the last grid segment (i.e., the nth grid segment), a 24-core optical cable is constructed to the substation B chain in the nth grid segment.

[0020] As a possible implementation method, further, incremental distribution facilities can be covered during networking, and dual-channel switches are configured at all covered sites;

[0021] At the same time, according to the aging situation, the existing old equipment will be replaced with dual-channel switches. Some equipment has not reached the renovation period and still uses single-channel switches. The single-channel switches and incremental dual-channel switches in the newly established ring network still use gray light networking, and the optical cable cores use 1 and 2 cores. The service transmission method remains unchanged.

[0022] As a possible implementation mode, further, the incremental distribution facilities include a ring main unit, a switchgear, and a distribution station building.

[0023] As a possible implementation, further, step 3) includes the following steps:

[0024] 3.1): Construction of converged interconnection optical cables;

[0025] 3.2): Industrial switches are transforming from single-channel to dual-channel.

[0026] As a possible implementation method, further, in step 3.1), a 48-core interconnection optical cable is constructed between each substation for aggregation layer networking.

[0027] As a possible implementation, further, step 3.2) specifically includes:

[0028] The dual-channel industrial switch uses dual-channel dedicated chips and wavelength division architecture modules to achieve multi-service hard pipe isolation between production services and collection services. Half of the ports can be used for access to production services in zones I and II, and the other half can be used for access to management services in zones III and IV.

[0029] After the commissioning period is reached, the dual-channel switches will be replaced one by one in grid order.

[0030] As a possible implementation method, further, a ring network structure is adopted between the dual-channel three-layer industrial switches in the substation aggregation layer network, and the uplink direction is connected to the substation's distribution automation router and data communication network router through a gigabit optical port; wherein cores 1 and 2 are used for production control area networking, cores 3 and 4 are used for non-production control area networking, the color optical port is used for downward aggregation and access to the ring three-layer switch, and the gray optical port is used for parallel networking and upward aggregation; at the same time, the existing single-channel three-layer switch is retained, and the switch uses a gray optical path to serially access the aggregation layer production network ring network, which is used to aggregate the single-channel ring networks and links of the remaining substations in the grid, and the network reconnection does not affect the normal business transmission of the remaining operating networks in the grid.

[0031] In the access layer network of the distribution station, the dual-channel Layer 2 industrial switch is used for communication access network access layer networking and is deployed in each target area; each dual-channel Layer 2 industrial switch forms a ring network structure through Gigabit Industrial Ethernet, and the dual-channel Layer 2 industrial switches are interconnected through wavelength division optical ports. Each Layer 2 ring occupies 2 wavelength division optical ports; the end node loopback cable and the networking optical cable of the ring network use different routes to access the upper-level Layer 3 switch, reducing the risk of the entire main cable being dug up and improving the reliability of the Layer 2 ring; each distribution station is synchronously connected to the station auxiliary control service.

[0032] As a possible implementation mode, further, the target area includes a ring main unit, a distribution station, a distribution room, and a switch station.

[0033] The beneficial effects of the present invention are as follows:

[0034] 1) The present invention breaks down the feeder equipment into parts and divides them into different grids. It gradually cuts over without affecting business operations, prolongs the cutover time limit, and cuts over one piece at a time when it is mature, thereby reducing the difficulty of construction and operation and maintenance, avoiding large-scale disconnection of the three remote terminals, and improving the reliability of power supply of the power grid and the production and living electricity consumption of end users.

[0035] 2) The present invention ensures the reliability of each grid after reconnection, realizes network integration by building new optical cables, does not add new branches, reduces operation and maintenance complexity, and meets the network N-1 requirement.

[0036] 3) In the present invention, the gray optical networking is still used during the equipment transition period to meet the flexible access of various equipment under construction and renovation projects, and each terminal can be "connected as much as possible", plug and play, and no investment waste is caused.

[0037] 4) In the present invention, equipment cutover and network optimization are performed simultaneously to meet the development requirements of future networks. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 This is the topology rewiring diagram of the terminal access network switch in phase 1;

[0040] Figure 2 This is a schematic diagram of the optical cable rewiring plan for the existing terminal access network in Phase 1;

[0041] Figure 3 This is the topology rewiring diagram of the terminal access network switch in phase 2;

[0042] Figure 4 This is a schematic diagram of the optical cable rewiring plan for the existing terminal access network in Phase II;

[0043] Figure 5 This is the topology rewiring diagram of the terminal access network switch in phase three;

[0044] Figure 6 This is a schematic diagram of the optical cable rewiring plan for the existing terminal access network in Phase 3;

[0045] Figure 7 This is the topology rewiring diagram of the terminal access network switch in stage 4;

[0046] Figure 8 This is a schematic diagram of the construction of converged optical cable interconnection in Phase 4;

[0047] Fig. 9 This is the current topology diagram of the existing terminal access network switches;

[0048] Fig.10 This is a schematic diagram of the current status of the existing terminal access network optical cable network. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0050] The present invention provides a grid-based smooth evolution method for a power terminal communication access network based on a dual-channel switch, comprising the following steps:

[0051] 1) Grid division

[0052] In order to ensure that business cutover does not cause large-scale power outages and inability to quickly recover after power outages, it is necessary to divide the 10kV feeder into a grid to reduce the impact of network cutover. The grid division of the 10kV communication network is the same as the grid requirements of the regional power grid. The 10kV feeder is grid-divided into n (n≥3) grid segments, and the n grid segments are numbered sequentially.

[0053] 2) Grid feeder segment grid connection

[0054] 2.1) Grid connection of the first grid feeder segment

[0055] According to the grid division, the first grid section of the 10kV feeder is disconnected from the rest of the grids. At the same time, according to the geographical location and the road network, a 24-core optical cable is built to the nearest node of the substation A ring and the substation B chain in the A grid. At the same time, the substation A ring is opened to the original second loop optical cable of the substation to realize the integration of the substation A ring and the substation B chain. In the networking process, the incremental distribution facilities should be covered as much as possible according to the actual situation of the road network, including ring network cabinets, switchgears, distribution stations, etc. The covered sites are equipped with dual-channel switches. At the same time, the existing old equipment is replaced with dual-channel switches according to the old situation. Since the existing single-channel switches are configured year by year and the commissioning years are different, some equipment has not reached the transformation period and still uses single-channel switches. In this scenario, the single-channel switches and incremental dual-channel switches in the newly formed ring network still use gray light networking, and the optical cable cores use 1 and 2 cores, and the service transmission method remains unchanged.

[0056] At the same time, in order to avoid disconnection of one side of the original dual-home networking network, which does not meet the network N-1 requirements and improve network reliability, when renovating the first grid segment, the 10kV feeder second grid segment network can be connected to the existing nearby substation B sub-ring or sub-chain through a newly built optical cable to achieve the integrated networking of the distribution terminal and the local integration transformation of the ring network topology. In the optical cable extension section, the synchronous access of incremental distribution facilities can be achieved according to the road network conditions. The access equipment uses a dual-channel switch, which is networked with a single-channel switch using gray light, and the optical cable core uses 1 and 2 cores.

[0057] 2.2) Re-grid connection of other grid feeder segments

[0058] According to the grid division, the second grid section of the 10kV feeder is disconnected from the rest of the grids. At the same time, according to the geographical location and the road network conditions, a 24-core optical cable is built to the substation A ring in the second grid section. At the same time, the substation A ring is opened to the original second loop optical cable of the substation to realize the integration network with the substation A ring. In the networking process, incremental distribution facilities should be covered as much as possible according to the actual situation of the road network, including ring network cabinets, switchgear, distribution station rooms, etc. The covered sites are equipped with dual-channel switches. At the same time, the existing old equipment is replaced with dual-channel switches according to the aging situation. Since the existing single-channel switches are configured year by year and the years of operation are different, some equipment has not reached the transformation period and still uses single-channel switches. In this scenario, the single-channel switches and incremental dual-channel switches in the newly formed ring network still use gray light networking, and the optical cable cores use 1 and 2 cores, and the service transmission method remains unchanged.

[0059] When renovating the second grid segment, the third grid segment network in the 10kV feeder is connected to the existing nearby substation B sub-ring or sub-chain through a newly built optical cable;

[0060] The reconnection of the 2nd to n-1th grid segments is realized according to the above-mentioned reconnection method. In the last grid segment (i.e., the nth grid segment), a 24-core optical cable is constructed to the substation B chain in the nth grid segment according to the geographical location and road network conditions. The relevant optical cable requirements and networking are consistent with those in the n-1th grid.

[0061] 3) Dual-channel switches are replaced one by one in each grid

[0062] 3.1) Construction of converged interconnection optical cables

[0063] A 48-core interconnected optical cable is built between each substation for aggregation layer networking.

[0064] 3.2) Industrial switches transition from single-channel to dual-channel

[0065] The dual-channel industrial switch uses dual-channel dedicated chips and wavelength division architecture modules to achieve multi-service hard pipe isolation of production services and collection services. Half of the ports can be used for access to production services in areas I and II, and the other half of the ports are used for access to management services in areas III and IV, achieving complete isolation of services without affecting each other. After the commissioning period is up, the dual-channel switches will be replaced one by one according to 1 to n grids.

[0066] Substation aggregation layer network: dual-channel three-layer industrial switches are networked in a ring network structure. The uplink direction is connected to the substation's distribution automation router and data communication network router through a gigabit optical port. Cores 1 and 2 are used for production control area networking, and cores 3 and 4 are used for non-production control area networking. Color optical ports are used for downward aggregation and access to the ring three-layer switch, and gray optical ports are used for parallel networking and upward aggregation. At the same time, the existing single-channel three-layer switch is retained. The switch uses gray optical paths to serially access the aggregation layer production network ring network, which is used to aggregate the single-channel ring networks and links of other substations in the grid. Network reconnection does not affect the normal business transmission of other operating networks in the grid.

[0067] Substation access layer network: Dual-channel Layer 2 industrial switches are used for communication access network access layer networking and are deployed in various ring network cabinets, substations, distribution rooms, switchgear and other areas. Each dual-channel Layer 2 industrial switch forms a ring network structure through Gigabit Industrial Ethernet. Dual-channel Layer 2 industrial switches are interconnected through wavelength division optical ports, and each Layer 2 ring occupies 2 wavelength division optical ports. The loopback optical cable of the end node of the ring network needs to be connected to the upper Layer 3 switch using a different route from the networking optical cable to reduce the risk of the entire main cable being cut and improve the reliability of the Layer 2 ring. Each substation is synchronously connected to the station auxiliary control service.

[0068] Example 1

[0069] This embodiment provides a grid-based smooth evolution method for a power terminal communication access network based on a dual-channel switch, which mainly includes the following steps:

[0070] 1) Phase 1: Grid division (see attached) Figures 1-2 (shown)

[0071] In order to ensure that service cutover does not cause large-scale power outages and inability to quickly recover after power outages, it is necessary to divide the 10kV feeder into a grid to reduce the impact of network cutover. The grid division of the 10kV communication network is the same as the grid requirements of the regional power grid, and the 10kV feeder is divided into several grid segments; in this embodiment, the 10kV feeder is divided into three grid segments A, B, and C.

[0072] 2) Phase 2: Grid-based feeder segment A rewiring (see attached Figures 3-4 (shown)

[0073] According to the grid division, the 10kV feeder A grid section is disconnected from the rest of the grids. At the same time, according to the geographical location and the road network, a 24-core optical cable is built to the nearest node of the substation A ring and the substation B chain in the A grid. At the same time, the substation A ring is opened to the original second loop optical cable of the substation to realize the integration of the substation A ring and the substation B chain. In the networking process, the incremental distribution facilities should be covered as much as possible according to the actual situation of the road network, including ring network cabinets, switchgear, distribution station buildings, etc. The covered sites are equipped with dual-channel switches. At the same time, the existing old equipment is replaced with dual-channel switches according to the aging situation. Since the existing single-channel switches are configured year by year and the commissioning years are different, some equipment has not reached the transformation period and still uses single-channel switches. In this scenario, the single-channel switches and incremental dual-channel switches in the newly formed ring network still use gray light networking, and the optical cable cores use 1 and 2 cores, and the service transmission method remains unchanged.

[0074] At the same time, in order to avoid disconnection of one side of the original dual-home networking network, which does not meet the network N-1 requirements and improve network reliability, when renovating the A grid segment, the 10kV feeder B grid segment network can be connected to the existing nearby substation B sub-ring or sub-chain through a newly built optical cable to achieve gradual transformation of the distribution terminal without causing the need for large-scale simultaneous cutover. In the optical cable extension section, the synchronous access of incremental distribution facilities can be achieved according to the road network conditions. The access equipment uses a dual-channel switch, which is networked with a single-channel switch using gray light, and the optical cable core uses 1 and 2 cores.

[0075] 3) Phase 3: Remaining grid feeder segments are reconnected (such as the attached Figures 5-6 (shown)

[0076] According to the grid division, the 10kV feeder B grid section is disconnected from the rest of the grids. At the same time, according to the geographical location and the road network conditions, a 24-core optical cable is built to the substation A ring in the B grid. At the same time, the substation A ring is opened to the original second loop optical cable of the substation to realize the integration network with the substation A ring. In the networking process, incremental distribution facilities should be covered as much as possible according to the actual situation of the road network, including ring network cabinets, switchgear, distribution station rooms, etc. The covered sites are equipped with dual-channel switches. At the same time, the existing old equipment is replaced with dual-channel switches according to the aging situation. Since the existing single-channel switches are configured year by year and the commissioning years are different, some equipment has not reached the transformation period and still uses single-channel switches. In this scenario, the single-channel switches and incremental dual-channel switches in the newly formed ring network still use gray light networking, and the optical cable cores use 1 and 2 cores, and the service transmission method remains unchanged.

[0077] At the same time, in order to avoid the disconnection of one side of the original dual-home networking, a 24-core optical cable is built to the B chain of substation in the C grid segment according to the geographical location and road network conditions. The relevant optical cable requirements and networking are consistent with those in the B grid segment.

[0078] 4) Phase 4: Dual-channel switches are replaced one by one in each grid (see attached Figures 7-8 (shown)

[0079] 4.1) Construction of converged interconnection optical cables

[0080] A 48-core interconnected optical cable is built between each substation for aggregation layer networking.

[0081] 4.2) Industrial switches transition from single-channel to dual-channel

[0082] The dual-channel industrial switch uses dual-channel dedicated chips and wavelength division architecture modules to achieve multi-service hard pipe isolation of production services and collection services. Half of the ports can be used for access to production services in areas I and II, and the other half of the ports are used for access to management services in areas III and IV, achieving complete isolation of services without affecting each other. After the commissioning period is up, the dual-channel switches will be replaced one by one according to the A, B, C and other grids.

[0083] Substation aggregation layer network: dual-channel three-layer industrial switches are networked in a ring network structure. The uplink direction is connected to the substation's distribution automation router and data communication network router through a gigabit optical port. Cores 1 and 2 are used for production control area networking, and cores 3 and 4 are used for non-production control area networking. Color optical ports are used for downward aggregation and access to the ring three-layer switch, and gray optical ports are used for parallel networking and upward aggregation. At the same time, the existing single-channel three-layer switch is retained. The switch uses gray optical paths to serially access the aggregation layer production network ring network, which is used to aggregate the single-channel ring networks and links of other substations in the grid. Network reconnection does not affect the normal business transmission of other operating networks in the grid.

[0084] Substation access layer network: Dual-channel Layer 2 industrial switches are used for communication access network access layer networking and are deployed in various ring network cabinets, substations, distribution rooms, switchgear and other areas. Each dual-channel Layer 2 industrial switch forms a ring network structure through Gigabit Industrial Ethernet. Dual-channel Layer 2 industrial switches are interconnected through wavelength division optical ports, and each Layer 2 ring occupies 2 wavelength division optical ports. The loopback optical cable of the end node of the ring network needs to be connected to the upper Layer 3 switch using a different route from the networking optical cable to reduce the risk of the entire main cable being cut and improve the reliability of the Layer 2 ring. Each substation is synchronously connected to the station auxiliary control service.

[0085] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for smooth grid evolution of a power terminal communication access network based on a dual-channel switch, characterized in that: include: 1): Grid the 10kV feeder into several grid segments; 2): Grid connection according to the grid feeder segments at each level; 3): Replace the dual-channel switches one by one in the grid.

2. The method for gridding and smoothing evolution of a power terminal communication access network based on a dual-channel switch according to claim 1 is characterized in that: Step 1) specifically includes: The 10kV feeder is gridded into n grid segments, and the n grid segments are numbered sequentially; the grid division of the 10kV communication network is the same as the grid requirements of the regional power grid.

3. The method for gridding and smoothing evolution of a power terminal communication access network based on a dual-channel switch according to claim 2 is characterized in that: Step 2) specifically includes the following steps: 2.1): Disconnect the first grid section in the 10kV feeder from the rest of the grids, and build a 24-core optical cable to the nearest nodes of the substation A ring and the substation B chain in the first grid section. At the same time, open the substation A ring to the original second loop optical cable of the substation to achieve integrated networking with the substation A ring and substation B chain; When renovating the first grid segment, the second grid segment network in the 10kV feeder is connected to the existing nearby substation B sub-ring or sub-chain through a newly built optical cable; In the extended section of the optical cable, the synchronous access of the incremental power distribution facilities can be realized. The access equipment adopts a dual-channel switch, which is networked with the single-channel switch using gray light. The optical cable cores use 1 and 2 cores. 2.2): Disconnect the second grid section in the 10kV feeder from the rest of the grids, and build a 24-core optical cable to the substation A ring in the second grid section. At the same time, open the substation A ring to the original second loop optical cable of the substation to achieve integrated networking with the substation A ring; When renovating the second grid segment, the third grid segment network in the 10kV feeder is connected to the existing nearby substation B sub-ring or sub-chain through a newly built optical cable; 2.3) Reconnect n-1 grid segments according to the reconnection method in step 2.2). In the last grid segment, build a 24-core optical cable to the substation B chain in the nth grid segment.

4. The method for gridding and smoothing evolution of a power terminal communication access network based on a dual-channel switch according to claim 3 is characterized in that: Incremental power distribution facilities can be covered during networking, and dual-channel switches are configured at all covered sites; At the same time, according to the aging situation, the existing old equipment will be replaced with dual-channel switches. Some equipment has not reached the renovation period and still uses single-channel switches. The single-channel switches and incremental dual-channel switches in the newly established ring network still use gray light networking, and the optical cable cores use 1 and 2 cores. The service transmission method remains unchanged.

5. The method for gridding and smoothing evolution of a power terminal communication access network based on a dual-channel switch according to claim 4 is characterized in that: The incremental distribution facilities include ring main units, switchgear, and distribution station buildings.

6. The method for gridding and smoothing evolution of a power terminal communication access network based on a dual-channel switch according to claim 1 is characterized in that: Step 3) includes the following steps: 3.1): Construction of converged interconnection optical cables; 3.2): Industrial switches are transforming from single-channel to dual-channel.

7. The method for gridding and smoothing evolution of a power terminal communication access network based on a dual-channel switch according to claim 6 is characterized in that: In step 3.1), a 48-core interconnection optical cable is constructed between each substation for aggregation layer networking.

8. The method for gridding and smoothing evolution of a power terminal communication access network based on a dual-channel switch according to claim 6 is characterized in that: Step 3.2) specifically includes: The dual-channel industrial switch uses dual-channel dedicated chips and wavelength division architecture modules to achieve multi-service hard pipe isolation between production services and collection services. Half of the ports can be used for access to production services in zones I and II, and the other half can be used for access to management services in zones III and IV. After the commissioning period is reached, the dual-channel switches will be replaced one by one in grid order.

9. The method for gridding and smoothing evolution of a power terminal communication access network based on a dual-channel switch according to claim 8 is characterized in that: In the substation aggregation layer network, the dual-channel three-layer industrial switches are networked in a ring network structure, and the uplink direction is connected to the substation's distribution automation router and data communication network router through the gigabit optical port; cores 1 and 2 are used for production control area networking, cores 3 and 4 are used for non-production control area networking, the color optical port is used for downward aggregation and access to the ring three-layer switch, and the gray optical port is used for parallel networking and upward aggregation; at the same time, the existing single-channel three-layer switch is retained, and the switch uses gray optical path serial access to the aggregation layer production network ring network, which is used to aggregate the single-channel ring networks and links of other substations in the grid. In the access layer network of the distribution station, the dual-channel Layer 2 industrial switch is used for communication access network access layer networking and is deployed in each target area; each dual-channel Layer 2 industrial switch forms a ring network structure through Gigabit Industrial Ethernet, and the dual-channel Layer 2 industrial switches are interconnected through wavelength division optical ports. Each Layer 2 ring occupies 2 wavelength division optical ports; the end node loopback cable and the networking optical cable of the ring network use different routes to access the upper-level Layer 3 switch; each distribution station is synchronously connected to the station auxiliary control service.

10. The method for gridding and smooth evolution of a power terminal communication access network based on a dual-channel switch according to claim 9, characterized in that: The target area includes ring main units, distribution stations, distribution rooms, and switchgear stations.

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