A hydropower station network reconstruction method based on redundancy technology

Abstract

The application discloses a hydropower station network reconstruction method based on a redundancy technology, which comprises the following steps: upgrading an internal control network of a hydropower station into a hundred-megabit redundant fiber ring network and configuring an MRP sub-ring redundancy protocol; establishing a Hiper-Ring gigabit redundant fiber ring network between watersheds of cascade hydropower stations and starting three-layer routing function and VRRP function; using Hesmann three-layer switches for data transmission between a remote control center and the hydropower station; adopting a link aggregation technology to add a two-layer aggregation device between a dam LCU switch and a watershed switch RSPE30; and performing function test. The hydropower station network reconstruction method based on the redundancy technology provided by the application adheres to the principles of openness, expansibility, reliability and investment saving, eliminates existing problems based on the existing network, does not affect the operation of the network that has been put into use during later network access reconstruction, combines industrial control technology with IT technology, and provides a redundant, reliable and efficient automatic control communication network for a computer monitoring system of the hydropower station.

Description

Technical Field

[0001] This invention relates to the field of monitoring system technology, specifically to a method for upgrading a hydropower station network based on redundancy technology. Background Technology

[0002] With the continuous development of industrial control technology and IT technology, the automation system of hydropower stations has evolved from "centralized control and decentralized functions" in the early 1980s to "hierarchical distributed control" in the 1980s, and now to the popular "automation, unmanned operation and intelligence". All of these systems have adopted computer system control to replace the conventional control methods of the past, realizing centralized monitoring methods of "unmanned operation, closed operation and network control", which has greatly improved the automation level and operational efficiency of hydropower stations.

[0003] However, the current hydropower station automation monitoring system network still has the following problems: (1) In the current design, the communication addresses of the LCU and the central control center inside the power station are set in the same network segment. This structure leads to a large network communication broadcast domain and unclear network planning. (2) Since the central control center, all equipment and servers of the power station are in the same broadcast domain, the larger the network broadcast domain, the larger the network traffic generated by the network broadcast communication, which will occupy the network transmission bandwidth. At the same time, the equipment needs to process more broadcast data packets, which will affect the overall performance of the network. There is no good solution for the limitations of broadcast domain, broadcast storm and other issues. The network security is not reliable enough and it is very easy for a problem in one power station to cause a failure in the entire basin. (3) When the network was initially built, most of the equipment used was RS2, RS20 or MS20 series, which are all Layer 2 100M switches. They do not support Layer 3 routing function and do not support gigabit speed. Moreover, facing the increasing data traffic, the 100M transmission bandwidth is also outdated and cannot meet the requirements. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the above-mentioned problems, the present invention is proposed.

[0006] Therefore, the technical problem solved by this invention is: the existing monitoring system network has problems such as unreasonable communication layout, unclear network planning, and inability to guarantee network performance and security, as well as how to optimize the redundancy transformation based on the existing network.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for upgrading a hydropower station network based on redundancy technology, comprising:

[0008] The internal control network of the hydropower station was upgraded to a 100 Mbps redundant fiber optic ring network, and an MRP sub-ring redundancy protocol was configured.

[0009] Establish a Hiper-Ring gigabit redundant fiber optic ring network between the cascade hydropower station basins, and enable Layer 3 routing and VRRP functions;

[0010] A Hirschmann Layer 3 switch is used for data transmission between the remote control center and the hydropower station.

[0011] By employing link aggregation technology, a Layer 2 aggregation device is added between the dam LCU switch and the RSPE30 watershed switch;

[0012] Conduct functional testing.

[0013] As a preferred embodiment of the hydropower station network transformation method based on redundancy technology described in this invention, the 100 Mbps redundant fiber optic ring network comprises various LCUs and the dam LCU, RS series switches within the local cascade hydropower station, and RSPE30 river basin switches; wherein the RSPE30 river basin switches act as sub-ring managers and support the Sub-Ring proprietary redundancy protocol; VLAN configuration information is added to the local LCU network to support each station using independent service VLANs; multimode fiber is used for interconnection of LCUs within the plant area, while single-mode fiber is used for the dam LCUs.

[0014] As a preferred embodiment of the hydropower station network transformation method based on redundancy technology described in this invention, the Hiper-Ring gigabit redundant fiber optic ring network includes:

[0015] A Hiper-Ring gigabit redundant fiber optic ring network was constructed using RSPE30 series Layer 3 devices; RSPE switches were deployed inside each hydropower station, and data transmission between the hydropower stations and between the central control center and the remote control center was achieved through the OSPF dynamic routing protocol;

[0016] Add VLAN configuration information to the local LCU network to support each station to use independent service VLANs; deploy two RSPE switches inside the central control center and enable VRRP function to form a virtual router.

[0017] As a preferred embodiment of the hydropower station network transformation method based on redundancy technology described in this invention, the Hirschmann Layer 3 switch includes: configuring the gateway function of the central control center within the Hirschmann Layer 3 switch, and communicating with the H3C router via the OSPF routing protocol.

[0018] As a preferred embodiment of the hydropower station network transformation method based on redundancy technology described in this invention, the redundancy technology specifically includes:

[0019] Hiper-Ring, MRP sub-ring, network coupled link redundancy technology, OSPF redundancy, VRRP redundancy.

[0020] As a preferred embodiment of the hydropower station network transformation method based on redundancy technology described in this invention, the Hiper-Ring ring comprises:

[0021] Periodically send detection signals to the network switch to determine whether the link is normal;

[0022] When the link is not interrupted, the Hiper-Ring protocol maintains logical breaks on the physical ring to prevent broadcast storms. Data packets will be transmitted in a clockwise or counterclockwise loop on the physical ring, updating their timestamps after passing through each switch and forwarding them to the next switch.

[0023] When a network link malfunctions, the Hiper-Ring protocol will detect it through the ring manager and promptly activate the link in standby mode to achieve rapid self-healing.

[0024] As a preferred embodiment of the hydropower station network transformation method based on redundancy technology described in this invention, the MRP sub-ring includes:

[0025] When a single point of failure occurs in the network within the station, the sub-ring manager will immediately detect the failure and change the blocked port to the forwarding state, so that the data packets can bypass the failure point and be successfully delivered to the target device.

[0026] When no single point of failure occurs in the network within the site, the sub-ring manager will maintain the forwarding status of all ports so that data packets can be transmitted normally between all devices. At this time, the sub-ring manager will periodically send heartbeat packets to monitor the network connection status to ensure the reliability and stability of the entire network.

[0027] If the sub-ring manager detects a port failure, it will automatically adjust the port's status according to the rules of the MRP protocol to ensure the normal operation of the network.

[0028] As a preferred embodiment of the hydropower station network transformation method based on redundancy technology described in this invention, the network coupling link redundancy technology includes:

[0029] When a transmission path fails, the backup path is automatically replaced, allowing data packets to re-enter the network from the backup path and continue to be transmitted in the network. After transmission is restored, the system will detect that the original transmission path has failed and repair or replace the faulty components through appropriate mechanisms to ensure the stability and reliability of the network.

[0030] When the transmission path is not faulty, the most suitable path is selected for data transmission according to the set priority and load balancing strategy. At the same time, the backup path will be in standby mode, ready to take over the transmission task at any time, so as to improve the fault tolerance and reliability of the network.

[0031] As a preferred embodiment of the hydropower station network transformation method based on redundancy technology described in this invention, the OSPF redundancy function includes:

[0032] When a router fails or the link changes, the OSPF protocol recalculates to find a new shortest path. The process involves the following steps:

[0033] Neighbor relationship maintenance: Routers establish neighbor relationships by exchanging Hello messages and periodically exchange LinkState Update messages to maintain neighbor relationships;

[0034] LSA broadcast: When a router detects a link change or a break in its relationship with a neighbor, it generates an LSA and sends the LSA to all routers directly connected to it.

[0035] SPF calculation: Once a Link State Advertisement is received, each router will recalculate the shortest path tree according to Dijkstra's algorithm. After the calculation is completed, the router will update its own routing table.

[0036] Routing table update: The router updates its routing table according to the shortest path tree, marks the corrupted path as invalid, and selects a new shortest path;

[0037] When the router does not fail or the link does not change, the OSPF protocol does not need to recalculate the shortest path tree. The router only needs to periodically exchange Hello messages with neighboring routers and update its routing table according to the Link State Database.

[0038] The VRRP redundancy features include:

[0039] When the host's next-hop router fails, routers on other available paths will take over forwarding the packets and attempt to pass them to the target network.

[0040] When the host's next-hop router is not broken, the data packet will be forwarded to that router, which will then be responsible for forwarding it to the target network. If multiple paths are available, the router will select the optimal path to forward the data packet based on the best path in its routing table.

[0041] As a preferred embodiment of the hydropower station network transformation method based on redundancy technology described in this invention, the link aggregation technology includes adding a Layer 2 aggregation device between the dam LCU switch and the river basin switch RSPE30 to aggregate multiple physical links into a single logical link.

[0042] The functional tests include:

[0043] Network connectivity testing, network self-healing capability testing, network performance testing, and service testing.

[0044] The beneficial effects of this invention are as follows: The hydropower station network transformation method based on redundancy technology provided by this invention adheres to the principles of openness, scalability, reliability, and cost-effectiveness. Based on the existing network, it eliminates existing problems, and the operation of the network already in use will not be affected during the subsequent network access transformation. It combines industrial control technology with IT technology, providing a redundant, reliable, and efficient automated control communication network for the hydropower station computer monitoring system. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0046] Figure 1 A flowchart illustrating the overall process of a hydropower station network transformation method based on redundancy technology, provided in the first embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of the overall network structure of a hydropower station network transformation method based on redundancy technology, provided in the first embodiment of the present invention. Detailed Implementation

[0048] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0049] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0050] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0051] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0052] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0054] Example 1

[0055] Reference Figures 1-2 As an embodiment of the present invention, a method for upgrading a hydropower station network based on redundancy technology is provided, comprising:

[0056] S1: Upgrade the internal control network of the hydropower station to a 100 Mbps redundant fiber optic ring network and configure the MRP sub-ring redundancy protocol.

[0057] The internal control network of the hydropower station mainly consists of a 100 Mbps redundant fiber optic ring network composed of various LCUs, the dam LCU, RS series switches within the local cascade hydropower stations, and RSPE30 river basin switches. This network is used for production network control within the station. The existing LCU switches are primarily reused; the hardware remains unchanged, and firmware upgrades are performed to save on investment. The network structure differs from the existing structure in that the RSPE30 river basin switches (supporting the Sub-Ring proprietary redundancy protocol) are incorporated into the local LCU network to jointly form an MRP protocol 100 Mbps redundant ring network (sub-ring), with two RSPE30 switches acting as sub-ring managers.

[0058] Furthermore, in accordance with the plan, new VLAN configuration information will be added, and each station will use an independent service VLAN.

[0059] It should be noted that multimode fiber is used for the interconnection of LCUs in the plant area, while single-mode fiber is recommended for the LCUs at the dam due to the long distance. When building a ring network, it is best to ensure that the transmission medium is consistent.

[0060] S2: Establish a Hiper-Ring gigabit redundant fiber optic ring network between the cascade hydropower station basins, and enable Layer 3 routing and VRRP functions;

[0061] The cascade hydropower station basin comprises four hydropower stations and one centralized control center: Shuiniujia, Ziyili, Muzuo, Yinping, and Baima. The basin switches utilize RSPE30 series Layer 3 equipment, and single-mode fiber connects the four hydropower stations and the Baima centralized control center into a Hiper-Ring gigabit redundant fiber optic ring network. Layer 3 routing is enabled, and internal VLAN interface addresses are configured for each hydropower station as gateway addresses for their internal terminal devices. VRRP functionality is configured between the basin switches within this power station, allowing a virtual gateway address to run simultaneously on two switches, ensuring continued operation even if one switch fails. OSPF dynamic routing protocol is used between all basin switches to achieve data communication between the hydropower stations, the Baima centralized control center, and the Chengdu remote control center.

[0062] Furthermore, the Hiper-Ring includes:

[0063] Periodically send detection signals to the network switch to determine whether the link is normal;

[0064] When the link is not interrupted, the Hiper-Ring protocol maintains logical breaks on the physical ring to prevent broadcast storms. Data packets will be transmitted in a clockwise or counterclockwise loop on the physical ring, updating their timestamps after passing through each switch and forwarding them to the next switch.

[0065] When a network link malfunctions, the Hiper-Ring protocol will detect it through the ring manager and promptly activate the link in standby mode to achieve rapid self-healing.

[0066] It should be noted that with the support of the Hiper-Ring protocol, the network self-healing recovery time is less than 200ms, and the current second-generation Hiper-Ring protocol has a network self-healing time of less than 10ms. This efficient network self-healing time makes it applicable to the substation industry, which has high real-time requirements.

[0067] MRP sub-rings include:

[0068] When a single point of failure occurs in the network within the station, the sub-ring manager will immediately detect the failure and change the blocked port to the forwarding state, so that the data packets can bypass the failure point and be successfully delivered to the target device.

[0069] When no single point of failure occurs in the network within the site, the sub-ring manager will maintain the forwarding status of all ports so that data packets can be transmitted normally between all devices. At this time, the sub-ring manager will periodically send heartbeat packets to monitor the network connection status to ensure the reliability and stability of the entire network.

[0070] If the sub-ring manager detects a port failure, it will automatically adjust the port's status according to the rules of the MRP protocol to ensure the normal operation of the network.

[0071] It should be noted that in an MRP ring, the ring manager is named the Media Redundancy Manager (MRM), and the ring clients are named Media Redundancy Clients (MRCs). MRM and MRC ring ports support three states: disabled, blocked, and forwarding. A disabled ring port discards all received frames. A blocked ring port discards all received frames except MRP control frames. A forwarding ring port forwards all received frames.

[0072] In this invention, we connect the station's switches (excluding the dam) to two RSPE switches within the station in a sub-ring configuration. These two RSPE switches act as sub-ring managers, managing the redundancy of the sub-rings. If a single point of failure occurs in the station's network, the sub-ring managers quickly allow blocked ports to resume operation, achieving rapid self-healing and ensuring continuous data communication.

[0073] Network coupling link redundancy techniques include:

[0074] When a transmission path fails, the backup path is automatically replaced, allowing data packets to re-enter the network from the backup path and continue to be transmitted in the network. After transmission is restored, the system will detect that the original transmission path has failed and repair or replace the faulty components through appropriate mechanisms to ensure the stability and reliability of the network.

[0075] When the transmission path is not faulty, the most suitable path is selected for data transmission according to the set priority and load balancing strategy. At the same time, the backup path will be in standby mode, ready to take over the transmission task at any time to improve the fault tolerance and reliability of the network.

[0076] OSPF redundancy features include:

[0077] When a router fails or the link changes, the OSPF protocol recalculates to find a new shortest path. The process involves the following steps:

[0078] Neighbor relationship maintenance: Routers establish neighbor relationships by exchanging Hello messages and periodically exchange LinkState Update messages to maintain neighbor relationships;

[0079] LSA broadcast: When a router detects a link change or a break in its relationship with a neighbor, it generates an LSA and sends the LSA to all routers directly connected to it.

[0080] SPF calculation: Once a Link State Advertisement is received, each router will recalculate the shortest path tree according to Dijkstra's algorithm. After the calculation is completed, the router will update its own routing table.

[0081] Routing table update: The router updates its routing table according to the shortest path tree, marks the corrupted path as invalid, and selects a new shortest path;

[0082] When the router does not fail or the link does not change, the OSPF protocol does not need to recalculate the shortest path tree. The router only needs to periodically exchange Hello messages with neighboring routers and update its routing table according to the Link State Database.

[0083] VRRP redundancy features include:

[0084] When the host's next-hop router fails, routers on other available paths will take over forwarding the packets and attempt to pass them to the target network.

[0085] When the host's next-hop router is not broken, the data packet will be forwarded to that router, which will then be responsible for forwarding it to the target network. If multiple paths are available, the router will select the optimal path to forward the data packet based on the best path in its routing table.

[0086] It should be noted that two RSPEs are deployed in each power station, with VRRP enabled. VRRP adds the two RSPEs to a backup group, forming a virtual router. The default gateway for hosts within the network is set to the IP address of this virtual router. The VRRP election mechanism determines which router undertakes the forwarding task. If the device undertaking the forwarding task fails, the other device will quickly take over its work. The virtual router will not fail, and the service failover is handled directly by VRRP without the terminal host's awareness. This effectively solves the gateway device failure problem, thus ensuring the continuity and reliability of communication. Two RSPE switches are deployed in the control center and each station, combining the advantages of VRRP and Hiper-Ring to achieve both device redundancy and link redundancy, ensuring uninterrupted data communication in the event of any device or link failure in the backbone ring network.

[0087] S3: Use a Hirschmann Layer 3 switch for data transmission between the remote control center and the hydropower station;

[0088] All production monitoring data from the cascade hydropower stations are forwarded in real time from the Baima Central Control Center Layer 3 switch to the Chengdu Remote Control Center for the Chengdu branch to monitor the operation of each hydropower station. Currently, the Baima gateway is installed in an H3C switch and communicates with the Baima H3C router via the OSPF protocol. This upgrade replaces the H3C switch with the Baima Central Control Center RSPE30 switch, and configures the gateway function of the Baima Central Control Center within a Hirschmann Layer 3 switch. Data communication between the Hirschmann and H3C routers is achieved through the OSPF routing protocol. The existing link between Baima and the H3C router in Chengdu is retained and will be responsible for communication between Baima and Chengdu.

[0089] S4: Using link aggregation technology, a Layer 2 aggregation device is added between the dam LCU switch and the RSPE30 watershed switch;

[0090] S5: Perform functional testing.

[0091] Network connectivity testing: Using the ping command or other tools, conduct network connectivity tests between various nodes, including connectivity within the local area network and between cascade hydropower stations. The test should include data transmission under normal conditions and data transmission under fault conditions. Under normal conditions, data should be transmitted smoothly; under fault conditions, the system should be able to quickly switch to a backup path and resume data transmission.

[0092] Network self-healing function test: This test verifies the reliability of the network's self-healing function. During the test, simulated fault conditions can be implemented, such as disconnecting a link or shutting down a switch. Then observe whether the network can quickly detect the fault and take appropriate measures to restore network connectivity.

[0093] Performance testing: This involves testing network performance metrics such as bandwidth, latency, and throughput. Using professional network performance testing tools, the actual performance of the network can be evaluated, including key indicators like bandwidth, latency, and throughput. Test results can be used to improve network architecture, thereby enhancing network performance and reliability.

[0094] Business testing: This tests whether the network can support the business requirements of various application scenarios. By simulating real-world usage scenarios, such as video conferencing, file transfer, and online gaming, the quality and stability of the network are tested to ensure that it meets the actual needs of users.

[0095] Example 2

[0096] As an embodiment of the present invention, a method for upgrading a hydropower station network based on redundancy technology is provided. To verify the beneficial effects of the present invention, the backbone ring network of the Huoxi River Basin and the internal ring networks of five stations (Shuiniujia, Ziyili, Muzuo, and Yinping) are upgraded and functional tests are conducted for scientific demonstration.

[0097] In this embodiment, the main contents of the network transformation are as follows:

[0098] (1) Constructing a gigabit backbone transmission network

[0099] A gigabit redundant optical transmission network was built between the Baima control center and the four power stations. The transmission network is configured with a ring redundancy protocol and has link redundancy capabilities, enabling timely, accurate and reliable transmission of various types of information required by the power stations.

[0100] (2) On-site network upgrade

[0101] As required by the plan, the network within the station was upgraded, and MRP sub-ring redundancy protocol was configured to enable link redundancy. The dam's network was connected to the network within the station using a coupled approach. VRRP protocol was configured and OSPF was run on the RSPE to ensure network connectivity while providing the backbone network with equipment redundancy, thereby improving network reliability.

[0102] The list of equipment to be modified is as follows:

[0103]

[0104]

[0105] Device naming and management address:

[0106]

[0107]

[0108] Based on the network topology and IP address planning of the computer monitoring system after the upgrade, different IP network segments and VLANs will be assigned to the four cascade hydropower stations and the Baima centralized control center; details are as follows:

[0109] Baima Central Control Center XX.XX.125.0 / 24 XX.XX.125.1 1 Buffalo Home Power Station XX.XX.131.0 / 24 XX.XX.131.200 5 From Yili Power Station XX.XX.132.0 / 24 XX.XX.132.200 6 Muza Power Station XX.XX.133.0 / 24 XX.XX.133.200 3 Yinping Power Station XX.XX.134.0 / 24 XX.XX.134.200 4

[0110] VRRP address planning is as follows:

[0111]

[0112] In the backbone ring network of the Huoxi River Basin, VLAN 100 was added to all devices, and the devices were configured with VLAN virtual interface addresses for use in Layer 3 routing communication interconnection; VLAN 20 was added to the devices in the Baima Central Control Center, and VLAN virtual interface addresses were configured for interconnection with H3C devices.

[0113] The table below lists the address information for interconnection between power plant switches and H3C routers in the river basin.

[0114]

[0115]

[0116] Key equipment interconnection port information:

[0117]

[0118]

[0119] The table above contains port information for ring network redundancy. It mainly includes three types of ports: backbone ring network ports, sub-ring network ports, and network coupling ports.

[0120] To verify the correctness of Hiper-Ring ring network, sub-ring, network coupling, and route switching configurations, the following tests were conducted:

[0121] Test environment: The backbone ring network of the Huoxi River Basin and the internal ring network of five stations: Shuiniujia, Ziyili, Muzuo and Yinping.

[0122] Test equipment: All network devices on site, laptops and some workstations for debugging, and fiber optic patch cords, twisted-pair cables, etc. for actual network connection.

[0123] Test inventions and methods:

[0124] (1) Backbone ring network redundancy function test

[0125] Each switch in the backbone ring network runs the Hiper-Ring redundancy protocol. When the ring network link status is normal, disconnect any point and verify the link switching status in the network management software. Observe whether the network connection devices are working properly, the number of packet losses (to devices within the site, to the Baima Center, to the Chengdu Remote Control Center, etc.), and whether the Baima Central Control Center monitoring platform and the Chengdu Remote Control Center monitoring platform generate alarm prompts.

[0126] (2) Testing of redundancy / coupling function of sub-rings within the station

[0127] With all switches in normal condition, test the ring network within the Muzuo and Yinping stations. Disconnect the ring line (fiber optic cable) or network cable at a certain point in the station's ring and coupling point. Observe whether the network connection equipment can work normally at the Baima Central Control Center, check the number of packet losses (to other devices in the station, to the Baima Center, to the Chengdu Remote Control Center, etc.), and whether the monitoring platforms of the Baima Central Control Center and the Chengdu Remote Control Center generate alarm prompts. Verify the network link switching status through network monitoring software.

[0128] Close the disconnected loop and observe whether the network connection devices are working properly, the number of packet losses (to other devices within the station, to the Baima Center, to the Chengdu Remote Control Center, etc.), and whether the Baima Central Control Center monitoring platform and the Chengdu Remote Control Center monitoring platform generate alarm prompts; and verify the network link switching status through network monitoring software.

[0129] This disconnection operation can be performed repeatedly by selecting multiple nodes within the station and enabling / disabling port functions via software or by physically disconnecting them.

[0130] (3) VRRP master / slave switchover function test

[0131] When the RSPE switch within the site is in normal condition, the VRRP interface shows that the two devices are in Master and Backup states respectively. Disconnect the internal network connection cable and the interconnect cable from the Master device. The device in Backup state should take over the role and become the Master. This can be observed through the device interface.

[0132] Observe whether the network connection equipment is working properly, the number of packet loss (to other devices in the station, to the Baima Center, to the Chengdu Remote Control Center, etc.), and whether the Baima Central Control Center monitoring platform and the Chengdu Remote Control Center monitoring platform generate alarm prompts;

[0133] Reconnect and observe the invention again.

[0134] Disconnecting the cable can also be done by disabling the routing or VRRP functions.

[0135] (4) VLAN connectivity test

[0136] After dividing the network within the Muzuo station into VLAN 3 as required, and using the XX.XX.133.X network segment as planned, and filling in the XX.XX.133.200 gateway address, communication with other stations and Baima and Chengdu will be possible; if defined as other network segments or the gateway address is not filled in, data communication will not be possible.

[0137] (5) Connectivity test with H3C network

[0138] Two RSPE30 switches in the Baima control center are connected to two H3C routers to communicate with the Chengdu remote control center. Routing information is learned and forwarded through the OSPF protocol. To test the network redundancy with the Chengdu remote control center, the internet cable between the switches and the H3C routers is repeatedly disconnected to observe network packet loss and check the operating status of the Chengdu remote control center monitoring platform.

[0139] Test results:

[0140] During disconnection tests on the backbone ring network, the HIPER-Ring redundancy protection mechanism ensured normal communication of the production monitoring network. Tests showed that line switching did not affect the overall operation of the production monitoring network, and there was virtually no data packet loss or system alarms.

[0141] Disconnection tests were conducted on the ring networks within each station. The use of MRP sub-rings and Coupling redundancy protection mechanisms ensured normal communication of the production monitoring network. Tests showed that line switching did not affect the overall operation of the production monitoring network and generally did not cause data packet loss or system alarms.

[0142] In the event of equipment failure within each station, the VRRP virtual redundancy management system can quickly perform primary / backup switching to ensure uninterrupted data flow within the station.

[0143] After configuring the service VLANs at each station, communication was normal.

[0144] The disconnection test between the Layer 3 switch and the H3C router in the Baima Central Control Center can achieve the initial effect or better, ensuring that the switch to the backup link is completed within 2-5 seconds (2-5 PING packets) and communication is restored.

[0145] In summary, all functions meet the design requirements. Based on the existing network, existing problems have been eliminated. The operation of the network already in use will not be affected during subsequent network access upgrades. By combining industrial control technology with IT technology, a redundant, reliable, and efficient automated control and communication network has been provided for the hydropower station computer monitoring system.

[0146] It should be noted that 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 preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for upgrading a hydropower station network based on redundancy technology, characterized in that, include: The internal control network of the hydropower station was upgraded to a 100 Mbps redundant fiber optic ring network, and an MRP sub-ring redundancy protocol was configured. Establish a Hiper-Ring gigabit redundant fiber optic ring network between the cascade hydropower station basins, and enable Layer 3 routing and VRRP functions; A Hirschmann Layer 3 switch is used for data transmission between the remote control center and the hydropower station. By employing link aggregation technology, a Layer 2 aggregation device is added between the dam LCU switch and the RSPE30 watershed switch; Perform functional testing; The 100 Mbps redundant fiber optic ring network comprises various LCUs and the dam LCU, RS series switches within the local cascade hydropower station, and RSPE30 river basin switches. The RSPE30 river basin switches act as sub-ring managers and support the Sub-Ring proprietary redundancy protocol. VLAN configuration information is added to the local LCU network to support each station using independent service VLANs. Multimode fiber is used for interconnection between LCUs within the plant area, while single-mode fiber is used for the dam LCUs. The Hiper-Ring gigabit redundant fiber optic ring network includes: A Hiper-Ring gigabit redundant fiber optic ring network was constructed using RSPE30 series Layer 3 devices; RSPE switches were deployed inside each hydropower station, and data transmission between the hydropower stations and between the central control center and the remote control center was achieved through the OSPF dynamic routing protocol; Add VLAN configuration information to the local LCU network to support each station to use independent service VLANs; deploy two RSPE switches inside the central control center and enable VRRP function to form a virtual router.

2. The hydropower station network transformation method based on redundancy technology as described in claim 1, characterized in that: The Hirschmann Layer 3 switch includes: configuring the gateway function of the central control center within the Hirschmann Layer 3 switch, and enabling data communication with the H3C router via the OSPF routing protocol.

3. The hydropower station network transformation method based on redundancy technology as described in claim 2, characterized in that: The redundancy technology specifically includes: Hiper-Ring, MRP sub-ring, network coupled link redundancy technology, OSPF redundancy function, VRRP redundancy function.

4. The hydropower station network transformation method based on redundancy technology as described in claim 3, characterized in that: The Hiper-Ring includes: Periodically send detection signals to the network switch to determine whether the link is normal; When the link is not interrupted, the Hiper-Ring protocol maintains logical breaks on the physical ring to prevent broadcast storms. Data packets will be transmitted in a clockwise or counterclockwise loop on the physical ring, updating their timestamps after passing through each switch and forwarding them to the next switch. When a network link malfunctions, the Hiper-Ring protocol will detect it through the ring manager and promptly activate the link in standby mode to achieve rapid self-healing.

5. The hydropower station network transformation method based on redundancy technology as described in claim 4, characterized in that: The MRP sub-ring includes: When a single point of failure occurs in the network within the station, the sub-ring manager will immediately detect the failure and change the blocked port to the forwarding state, so that the data packets can bypass the failure point and be successfully delivered to the target device. When no single point of failure occurs in the network within the site, the sub-ring manager will maintain the forwarding status of all ports so that data packets can be transmitted normally between all devices. At this time, the sub-ring manager will periodically send heartbeat packets to monitor the network connection status to ensure the reliability and stability of the entire network. If the sub-ring manager detects a port failure, it will automatically adjust the port's status according to the rules of the MRP protocol to ensure the normal operation of the network.

6. The hydropower station network transformation method based on redundancy technology as described in claim 5, characterized in that: The network coupling link redundancy technology includes: When a transmission path fails, the backup path is automatically replaced, allowing data packets to re-enter the network from the backup path and continue to be transmitted in the network. After transmission is restored, the system will detect that the original transmission path has failed and repair or replace the faulty components through appropriate mechanisms to ensure the stability and reliability of the network. When the transmission path is not faulty, the most suitable path is selected for data transmission according to the set priority and load balancing strategy. At the same time, the backup path will be in standby mode, ready to take over the transmission task at any time to improve the fault tolerance and reliability of the network.

7. The hydropower station network transformation method based on redundancy technology as described in claim 6, characterized in that: The OSPF redundancy function includes: When a router fails or the link changes, the OSPF protocol recalculates to find a new shortest path. The process involves the following steps: Neighbor relationship maintenance: Routers establish neighbor relationships by exchanging Hello messages and periodically exchange Link StateUpdate messages to maintain neighbor relationships; LSA broadcast: When a router detects a link change or a break in its relationship with a neighbor, it generates an LSA and sends the LSA to all routers directly connected to it. SPF calculation: Once a Link State Advertisement is received, each router will recalculate the shortest path tree according to Dijkstra's algorithm. After the calculation is completed, the router will update its own routing table. Routing table update: The router updates its routing table according to the shortest path tree, marks the corrupted path as invalid, and selects a new shortest path; When the router does not fail or the link does not change, the OSPF protocol does not need to recalculate the shortest path tree. The router only needs to periodically exchange Hello messages with neighboring routers and update its routing table according to the Link State Database. The VRRP redundancy function includes: When the host's next-hop router fails, routers on other available paths will take over forwarding the packets and attempt to pass them to the target network. When the host's next-hop router is not broken, the data packet will be forwarded to that router, which will then be responsible for forwarding it to the target network. If multiple paths are available, the router will select the optimal path to forward the data packet based on the best path in its routing table.

8. The hydropower station network transformation method based on redundancy technology as described in claim 7, characterized in that: The link aggregation technology includes adding a Layer 2 aggregation device between the dam LCU switch and the RSPE30 watershed switch to aggregate multiple physical links into a single logical link. The functional tests include: Network connectivity testing, network self-healing capability testing, network performance testing, and service testing.

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