A network communication system and communication method for an intelligent substation

Abstract

The present invention provides a network communication system and method for a smart substation. The network communication system can communicate in MMS, SV, GOOSE, and IEEE1588. The system comprises: a station control layer, bay layer, and process layer of the smart substation, as well as a central switch, multiple main switches, and redundant switches for each main switch. All main switches and redundant switches are connected to the central switch; each main switch is connected end-to-end to form a main switching layer; each redundant switch is connected end-to-end to form a redundant switching layer; and each device in the station control layer, bay layer, and process layer of the smart substation is connected to a main switch and the redundant switch corresponding to the main switch. Compared with commonly used star and ring topologies, this substation communication system increases the redundancy of the communication network and improves the reliability of the communication system.

Description

Technical Field

[0001] The present invention relates to the field of power system communications, and in particular to a network communication system and a communication method for an intelligent substation. Background Art

[0002] Smart substations are key nodes in the smart grid and are rapidly developing due to their low-carbon, environmentally friendly capabilities, excellent interactivity, and reliability. As the "nervous system" of the smart grid, their performance directly determines the reliability of their functionality. Smart substations typically operate using a three-layer, two-network architecture. Specifically, smart substations connect the station control layer to the bay layer, and the bay layer to the process layer, respectively, through independent station buses and process buses, ensuring data exchange and sharing between these layers. With the development of science and technology, smart substations currently adopt "three layers and one network" technology, or even "four networks in one" technology. The purpose is to use switch technology and virtual local area network (VLAN) technology to transmit the MMS network, GOOSE network, SV network based on the IEC61850 standard and the time synchronization network based on the IEEE1588 standard through the same Ethernet, so as to realize the transformation of smart substations from a "three layers and two networks" structure to a "one layer and one network" structure, effectively simplify equipment redundancy, reduce construction and land costs, realize high-level information sharing throughout the station, interoperability between multiple devices within the station, and direct access to information across intervals and levels; facilitate the monitoring of equipment status throughout the station, realize the coordination between integrated communication and dispatching of the entire station, and facilitate operation and maintenance.

[0003] However, on the same Ethernet network, the data traffic of "four networks in one" is higher than that of "three layers and two networks", and the real-time performance is reduced; most equipment uses a single set of configurations, and the reliability is weakened compared to the dual configuration. Therefore, this technology is mainly used in low-voltage and small-scale substations downstream of the dispatching system. Despite this, the problem of poor reliability of the "four networks in one" technology has not been effectively solved. Summary of the Invention

[0004] In order to solve the incompatibility problem existing in the prior art smart substation, the present invention provides a network communication system and a communication method for a smart substation.

[0005] The present invention provides a network communication system for a smart substation, which can perform MMS, SV, GOOSE and IEEE1588 communications;

[0006] The network communication system includes: a station control layer, a bay layer and a process layer of the smart substation, as well as a central switch, multiple main switches and redundant switches provided for each main switch;

[0007] All main switches and redundant switches are connected to the central switch;

[0008] Each main switch is connected end to end to form a main switching layer; each redundant switch is connected end to end to form a redundant switching layer;

[0009] Each device in the station control layer, bay layer and process layer of the smart substation is connected to a main switch and a redundant switch corresponding to the main switch.

[0010] Preferably, the master switch includes multiple process layer master switches and one station control layer master switch;

[0011] The redundant switches include: a process layer redundant switch provided for each process layer main switch and a station control layer redundant switch provided for the station control layer main switch.

[0012] Preferably, the devices of the bay layer and the process layer are provided with at least three communication interfaces, two of which are respectively connected to the process layer main switch and the process layer redundant switch corresponding to the process layer main switch, and the third communication interface is connected to the protection device corresponding to the devices of the bay layer and the process layer;

[0013] The equipment of the station control layer is provided with at least two communication interfaces, which are respectively connected to the station control layer main switch and the station control layer redundant switch corresponding to the station control layer main switch.

[0014] Preferably, the equipment of the process layer includes: a mutual inductor group, an intelligent switch and an integrated intelligent device;

[0015] The equipment of the spacer layer includes: protection device, measurement and control device, metering device, status monitoring device, dynamic recording device and integrated protection and measurement device;

[0016] The equipment in the station control layer includes: synchronous clock, monitoring host and telecontrol device.

[0017] Preferably, the protection device and the integrated protection and measurement device are respectively provided with four communication interfaces, and the four communication interfaces include: a signal input terminal a, a signal input terminal b, a signal input terminal c and a signal input terminal d;

[0018] The signal input terminal a is connected to a process layer main switch, and is used to obtain sampling values from the network communication system through the process layer main switch, send GOOSE messages to the intelligent switches and integrated intelligent devices in the process layer, and exchange information with the station control layer;

[0019] The signal input terminal b is connected to the process layer redundant switch corresponding to the process layer main switch, and is used to connect to the network communication system through the process layer redundant switch to receive and send information when the process layer main switch fails;

[0020] The signal input terminal c is connected to the mutual inductor group and the integrated intelligent device in the process layer, and is used to directly obtain the sampled value when the network communication system fails;

[0021] The signal input terminal d is connected to the intelligent switch and the integrated intelligent device in the process layer, and is used to directly execute the action signal when the network communication system fails.

[0022] Preferably, the monitoring host is connected to the network communication system through the station control layer main switch and the station control layer redundant switch.

[0023] Preferably, the number of the main switches and redundant switches is determined by the number of protection and measurement control devices;

[0024] Among them, the protection, measurement and control device includes: a protection device, a measurement and control device, and an integrated protection and measurement device.

[0025] Preferably, when communicating through the network communication system, the sending end sends high-priority information to the redundant switch, which is forwarded to the receiving end through the redundant switch; and sends low-priority information to the main switch, which is forwarded to the receiving end through the main switch.

[0026] Preferably, the main switch and the redundant switch serve as backup for each other.

[0027] Preferably, the devices in the network communication system are connected via optical fibers.

[0028] Based on the same inventive concept, the present invention also provides a network communication method for a smart substation, comprising:

[0029] When communicating based on the network communication system, a sending end and a receiving end are determined from the devices of the station control layer, the bay layer and the process layer of the smart substation;

[0030] Acquire the shortest path of information flow between the sending end and the receiving end based on the topology structure of the network communication system;

[0031] The information flow is transmitted along the acquired shortest path.

[0032] Preferably, the obtaining of the shortest path of the information flow between the sending end and the receiving end based on the topology structure of the network communication system includes:

[0033] Pre-generate a path table based on the topological structure of the network communication system;

[0034] Reading the shortest path of the information flow between the sending end and the receiving end in the path table;

[0035] When a communication link in the shortest path fails, the shortest path excluding the failed link is re-acquired based on the path table.

[0036] Preferably, the generation of the path table includes:

[0037] Based on the topology of the network communication system, the same weight is set for the central switch and the non-central switch, and the Dijkstra algorithm is used to traverse all paths of the information flow from the sender to the receiver.

[0038] Count the number of central switches and non-central switches passed through each path respectively;

[0039] Obtain corresponding path values based on the number of central switches and non-central switches passed through in each path, and the corresponding weights;

[0040] Arrange all path values in ascending order and store the corresponding paths to generate a path table;

[0041] The non-central switches include: a main switch and a redundant switch.

[0042] Preferably, determining whether a communication link in the shortest path has failed includes:

[0043] When transmitting information based on the shortest path, if the sending end cannot receive the response information sent by the receiving end within a set time, it is determined that a failure occurs in the communication link between the sending end and the receiving end.

[0044] Preferably, when a communication link in the shortest path fails, after re-obtaining the shortest path excluding the failed link based on the path table, the method further includes:

[0045] The sending end sends a confirmation message to the main switch, redundant switch or central switch connected to the faulty link through the faulty link within the set link access interval;

[0046] When the faulty link is repaired, the sending end will receive a response message from the main switch, redundant switch or central switch connected to the repaired link, and then determine that the faulty link has been repaired and update the shortest path through the path table.

[0047] Preferably, transmitting the information flow along the acquired shortest path includes:

[0048] When the receiving end receives two or more information flows simultaneously, it generates a processing order for the information flows based on the priority of each information flow;

[0049] When both the primary switch and the redundant switch connected to the receiving end are operating normally, the information flow with a high priority is sent to the redundant switch according to the processing order, and is transmitted to the receiving end through the redundant switch along the obtained shortest path; the information flow with a low priority is sent to the primary switch, and is transmitted to the receiving end through the primary switch along the obtained shortest path;

[0050] When the main switch or redundant switch connected to the receiving end fails, the information flow is sent to the redundant switch or main switch that serves as a backup for each other;

[0051] Among them, the priorities of the information flows from high to low are: protection tripping command, SV sampling value and status information, timing information, station control layer control command, and fault information.

[0052] Preferably, the main switch / redundant switch fails, including:

[0053] If the sending end does not receive a response from the primary switch / redundant switch within the set time, the primary switch / redundant switch fails.

[0054] Preferably, after the main switch / redundant switch fails, the method further includes:

[0055] The sending end sends a confirmation message to the failed main switch / redundant switch within the set access interval;

[0056] When the main switch / redundant switch is repaired, the sending end will receive the response information sent by the repaired main switch / redundant switch and determine that the main switch / redundant switch has been repaired.

[0057] Compared with the prior art, the present invention has the following beneficial effects:

[0058] 1. The technical solution provided by the present invention is a network communication system that can communicate in MMS, SV, GOOSE and IEEE1588. The network communication system includes: the station control layer, bay layer and process layer of the smart substation, as well as a central switch, multiple main switches and redundant switches set for each main switch; all main switches and redundant switches are connected to the central switch; each main switch is connected end to end to form a main switching layer; each redundant switch is connected end to end to form a redundant switching layer; each device in the station control layer, bay layer and process layer of the smart substation is connected to a main switch and the redundant switch corresponding to the main switch. Compared with the commonly used star and ring topologies, this network communication system increases the redundancy of the communication network and improves the reliability of the communication system.

[0059] 2. The technical solution provided by the present invention will not affect the normal communication of the smart substation system when the central switch fails.

[0060] 3. The technical solution provided by the present invention allows normal communication to be carried out through the redundant switch when the main switch fails.

[0061] 4. The technical solution provided by the present invention can ensure the normal transmission of information through another shortest path when a communication link fails, thereby improving the reliability of information transmission.

[0062] 5. The technical solution provided by the present invention sends high-priority messages and low-priority messages to the main switch and redundant switch for forwarding respectively, thereby improving the utilization rate of the redundant switch and reducing the queuing time of the messages.

[0063] 6. The technical solution provided by the present invention receives information streams of different priorities at the same time, and receives and processes the information in descending order of priority, thereby ensuring timely reception and processing of important information and improving the real-time reliability of transmission and processing of important information. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 This is a schematic diagram of the network communication system structure of a smart substation in the present invention;

[0065] Figure 2 Schematic diagram of the relationship between paths and weights in an embodiment of the present invention;

[0066] Figure 3 Schematic diagram of the calculation process of the path value in an embodiment of the present invention;

[0067] Figure 4 This is a schematic diagram of an embodiment of the present invention when any link fails;

[0068] Figure 5 This is a schematic diagram of a master switch failure according to an embodiment of the present invention;

[0069] Figure 6 Schematic diagram of information flow of a substation network system in an embodiment of the present invention;

[0070] Among them, 1-1, central switch, 1-2, switch A of process layer 1, 1-3, switch A of process layer 2, 1-4, switch A of process layer N-1, 1-5, switch A of station control layer, 1-6, switch B of process layer 1, 1-7, switch B of process layer 2, 1-8, switch B of process layer N-1, 1-9, switch B of station control layer, 1-10, bay layer 1, 1-11, process layer 1, 1-12, process layer 2, 1-13, bay layer 2, 1-14, bay layer N-1, 1-15, process layer N-1, 1-16, station control layer, 1-17, optical fiber;

[0071] 1. The voltage and current sampling values (SV) and merging unit alarm information (GOOSE) sent by the merging unit (line) to the measurement and control device (line).

[0072] 2. The voltage and current sampling values (SV) sent by the merging unit (line) to the protection device (line),

[0073] 3. The voltage and current sampling values (SV) sent by the merging unit (line) to the protection device (busbar),

[0074] 4. The voltage and current sampling values (SV) and merging unit status monitoring information (GOOSE) sent by the merging unit (line) to the dynamic recording device,

[0075] 5. The switch control command (GOOSE) sent by the measurement and control device (line) to the intelligent terminal (line)

[0076] 6. The switch control command (GOOSE) sent by the measurement and control device (line) to the intelligent terminal (bus tie)

[0077] 7. The switch opening and closing position and locking information (GOOSE) sent by the intelligent terminal (line) to the measurement and control device (line), and the alarm information (GOOSE) of the intelligent terminal and switchgear,

[0078] 8. The switch opening and closing position and locking information (GOOSE) sent by the intelligent terminal (line) to the protection device (line)

[0079] 9. The switch opening and closing position and locking information (GOOSE) sent by the intelligent terminal (line) to the protection device (line)

[0080] 10. The switch opening and closing position information (GOOSE) and the device status monitoring information (GOOSE) sent by the intelligent terminal (line) to the dynamic recording device,

[0081] 11. The protection tripping command (GOOSE) sent by the protection device (line) to the intelligent terminal (line)

[0082] 12. The voltage sampling value (SV) and the merging unit alarm information (GOOSE) sent by the merging unit (busbar) to the measurement and control device (line)

[0083] 13. The voltage sampling value (SV) and merging unit alarm information (GOOSE) sent by the merging unit (busbar) to the measurement and control device (bus coupler)

[0084] 14. The voltage sampling value (SV) and the merging unit alarm information (GOOSE) sent by the merging unit (bus) to the measurement and control device (bus),

[0085] 15. The voltage sampling value (SV) sent by the merging unit (bus) to the protection device (bus),

[0086] 16. The voltage sampling value (SV) and merging unit status monitoring information (GOOSE) sent by the merging unit (busbar) to the dynamic recording device,

[0087] 17. The switch control command (GOOSE) sent by the measurement and control device (bus coupler) to the intelligent terminal (bus coupler)

[0088] 18. The voltage sampling value (SV) sent by the merging unit (bus) to the merging unit (line),

[0089] 19. The voltage sampling value (SV) sent by the merging unit (busbar) to the merging unit (bus tie),

[0090] 20. The voltage and current sampling values (SV) sent by the merging unit (bus coupler) to the protection device (bus coupler) are:

[0091] 21. The voltage and current sampling values (SV) sent by the merging unit (bus tie) to the protection device (busbar)

[0092] 22. The voltage and current sampling values (SV) sent by the merging unit (bus tie) to the measurement and control device (line) are:

[0093] 23. The voltage and current sampling values (SV) sent by the merging unit (bus coupler) to the measurement and control device (bus coupler) are:

[0094] 24. The voltage and current sampling values (SV) sent by the merging unit (bus tie) to the measurement and control device (busbar)

[0095] 25. The voltage and current sampling values (SV) and merging unit status monitoring information (GOOSE) sent by the merging unit (bus tie) to the dynamic recording device,

[0096] 26. The protection tripping command (GOOSE) sent by the protection device (bus coupler) to the intelligent terminal (bus coupler)

[0097] 27. The switch control command (GOOSE) sent by the measurement and control device (busbar) to the intelligent terminal (bus coupler)

[0098] 28. The opening and closing position information and locking information (GOOSE) sent by the intelligent terminal (bus coupler) to the measurement and control device (line), the intelligent terminal and switch alarm information (GOOSE),

[0099] 29. The opening and closing position information and locking information (GOOSE) sent by the intelligent terminal (bus coupler) to the measurement and control device (bus coupler), and the intelligent terminal and switch alarm information (GOOSE),

[0100] 30. The closing position information (GOOSE) sent by the intelligent terminal (bus coupler) to the protection device (bus coupler)

[0101] 31. The opening and closing position information and locking information (GOOSE) sent by the intelligent terminal (busbar) to the measurement and control device (busbar), the intelligent terminal and switch alarm information (GOOSE),

[0102] 32. The opening and closing position information (GOOSE) and the device status monitoring information (GOOSE) sent by the intelligent terminal (bus coupler) to the dynamic recording device,

[0103] 33. The closing position information (GOOSE) sent by the intelligent terminal (bus tie) to the protection device (busbar)

[0104] 34. The protection tripping command (GOOSE) sent by the protection device (busbar) to the intelligent terminal (bus coupler)

[0105] 35. The protection tripping command (GOOSE) sent by the protection device (busbar) to the intelligent terminal (line)

[0106] 36. The protection trip command (GOOSE) sent by the protection device (busbar) to the intelligent terminal (high voltage side of the transformer)

[0107] 37. The voltage and current sampling values (SV) sent by the merging unit (high voltage side of the transformer) to the protection device (busbar)

[0108] 38. The voltage and current sampling values (SV) sent by the merging unit (high voltage side of the transformer) to the protection device (transformer)

[0109] 39. The voltage and current sampling values (SV) and merging unit alarm information (GOOSE) sent by the merging unit (transformer high-voltage side) to the measurement and control device (transformer)

[0110] 40. The voltage and current sampling values (SV) and merging unit status monitoring information (GOOSE) sent by the merging unit (transformer high-voltage side) to the dynamic recording device,

[0111] 41. The switch control command (GOOSE) sent by the measurement and control device (transformer) to the intelligent terminal (transformer high-voltage side)

[0112] 42. The switch opening and closing position information (GOOSE) sent by the intelligent terminal (high voltage side of the transformer) to the protection device (busbar)

[0113] 43. The switch opening and closing position information (GOOSE) sent by the intelligent terminal (high voltage side of the transformer) to the protection device (transformer)

[0114] 44. The switch opening and closing position and locking information (GOOSE) sent by the intelligent terminal (high voltage side of the transformer) to the measurement and control device (transformer), and the alarm information (GOOSE) of the intelligent terminal and switchgear,

[0115] 45. The switch opening and closing position information (GOOSE) and the device status monitoring information (GOOSE) sent by the intelligent terminal (high voltage side of the transformer) to the dynamic recording device,

[0116] 46. Protection trip information (GOOSE) sent by the protection device (transformer) to the intelligent terminal (transformer high voltage side),

[0117] 47. The voltage and current sampling values (SV), merging unit alarm information (GOOSE), switch opening and closing position and locking information (GOOSE), and device and switchgear alarm information (GOOSE) sent by the integrated intelligent device (medium and low voltage sides of the transformer) to the measurement and control device (transformer) are:

[0118] 48. The switch opening and closing position information (GOOSE) sent by the integrated intelligent device (transformer medium and low voltage side) to the dynamic recording device, and the device's own status monitoring information (GOOSE),

[0119] 49. Status monitoring information (MMS) of the measurement and control device sent by the measurement and control device (line) to the monitoring host, alarm information (MMS) of the intelligent terminal, merging unit, etc., voltage and current effective value (MMS),

[0120] 50. The protection action logic and intermediate node information (MMS) and the device's own alarm information (MMS) sent by the protection device (line) to the monitoring host,

[0121] 51. Protection tripping command (GOOSE), protection action logic and intermediate node information (MMS), protection device status monitoring information (MMS) sent by the protection device (line) to the dynamic recording device,

[0122] 52. The bus coupling measurement and control device (bus coupling) sends alarm information (MMS) to the monitoring host, voltage and current effective value (MMS), intelligent terminal, merging unit and other status monitoring information (MMS),

[0123] 53. The inter-bay interlocking information (GOOSE) sent by the measurement and control device (busbar) is

[0124] 54. Protection action logic and intermediate node information (MMS), protection device status monitoring information (MMS) sent by the protection device (bus coupler) to the dynamic recording device,

[0125] 55. The protection action logic and intermediate node information (MMS) sent by the protection device (bus coupler) to the monitoring host, the device status monitoring and alarm information (MMS),

[0126] 56. The busbar measurement and control device (busbar) sends alarm information (MMS), voltage and current effective value (MMS), intelligent terminal, merging unit and other status monitoring information (MMS) to the monitoring host.

[0127] 57. The cross-bay interlocking information (GOOSE) sent by the measurement and control device (busbar)

[0128] 58. Start failure protection information (GOOSE) sent by the protection device (busbar) to the protection device (bus coupler),

[0129] 59. The protection action logic and intermediate node information (MMS) sent by the protection device (busbar) to the monitoring host, the device status monitoring and alarm information (MMS),

[0130] 60. Protection tripping command (GOOSE), protection action logic and intermediate node information (MMS), protection device status monitoring information (MMS) sent by the protection device (busbar) to the dynamic recording device,

[0131] 61. The alarm information (MMS) of the measurement and control device itself, voltage and current effective value (MMS), the device status monitoring information (MMS), the merging unit, the intelligent terminal and other monitoring information (MMS) sent by the measurement and control device (transformer) to the monitoring host,

[0132] 62. Start failure protection information (GOOSE) sent by the protection device (transformer) to the protection device (busbar),

[0133] 63. The protection action logic and intermediate node information (MMS) sent by the protection device (transformer) to the monitoring host, the device status monitoring and alarm information (MMS),

[0134] 64. Protection tripping command (GOOSE), protection action logic and intermediate node information (MMS), and protection device status monitoring information (MMS) sent by the protection device (transformer) to the dynamic recording device,

[0135] 65. The monitoring host sends the function pressure plate throw-in and throw-out instructions and set value (MMS), switch control instructions (MMS) to the measurement and control device (line),

[0136] 66. The monitoring host sends the protection device (line) the protection device function pressure plate throw and release instructions and set values (MMS),

[0137] 67. The monitoring host sends the protection device (busbar) function pressure plate throw and release instructions and set values (MMS),

[0138] 68. The monitoring host sends the protection device (bus coupler) the protection device function pressure plate throw and release instructions and set values (MMS),

[0139] 69. The monitoring host sends the function pressure plate input and output instructions and set value (MMS), switch control instructions (MMS) to the measurement and control device (bus coupler),

[0140] 70. The monitoring host sends the function pressure plate throw-in / out instructions and set value (MMS), switch control instructions (MMS) to the measurement and control device (busbar),

[0141] 71. The monitoring host sends the protection device (transformer) the protection device function pressure plate throw and release instructions and set values (MMS),

[0142] 72. The monitoring host sends the function pressure plate input and output instructions and set value (MMS), switch control instructions (MMS) to the measurement and control device (transformer),

[0143] 73. Synchronous clock sends synchronous clock information (IEEE1588) to all devices on the network.

[0144] 74.SV+GOOSE+MMS+IEEE1588 transmission network. DETAILED DESCRIPTION

[0145] In order to better understand the present invention, the present invention is further described below with reference to the accompanying drawings and examples.

[0146] Example 1:

[0147] like Figure 1 As shown, the present invention provides a network communication system for a smart substation, which can perform MMS, SV, GOOSE and IEEE1588 communications;

[0148] The network communication system includes: a station control layer, a bay layer and a process layer of the smart substation, as well as a central switch, multiple main switches and redundant switches provided for each main switch;

[0149] All main switches and redundant switches are connected to the central switch;

[0150] Each main switch is connected end to end to form a main switching layer; each redundant switch is connected end to end to form a redundant switching layer;

[0151] Each device in the station control layer, bay layer and process layer of the smart substation is connected to a main switch and a redundant switch corresponding to the main switch.

[0152] The process layer includes a mutual inductor group, an intelligent switch, and an integrated intelligent device. The intelligent switch includes a circuit breaker and an intelligent operation unit integrated with the circuit breaker. The process layer equipment is provided with three communication interfaces. The first communication interface is connected to a process layer switch and connected through the process layer switch. The second communication interface is connected to a redundant process layer switch. The third communication interface is connected to the corresponding protection device.

[0153] The spacer layer is equipped with a protection device, a measurement and control device, a metering device, a state monitoring device, a dynamic recording device and a protection and measurement integrated device. The protection device, measurement and control device, metering device, state monitoring device, dynamic recording device and protection and measurement integrated device are connected to the process layer switch and the redundant process layer switch.

[0154] The mutual inductor group includes an electronic mutual inductor and a merging unit integrated with the electronic mutual inductor.

[0155] The station control layer is provided with a synchronous clock, a monitoring host and a telecontrol device in accordance with the IEEE1588 standard, and the synchronous clock, the monitoring host and the telecontrol device in accordance with the IEEE1588 standard are all connected to the station control layer switch and the redundant station control layer switch.

[0156] The process-layer switches and station-control-layer switches are decentralized switches, totaling 2N, with 2(N-1) process-layer switches and 2 station-control-layer switches. The decentralized switches are divided into two layers. One layer consists of N-1 process-layer switches and one station-control-layer switch, connected end-to-end via optical fiber, forming a ring topology with the optical fibers as branches and the switches as nodes. This ring topology is connected to the central switch via optical fiber. The other layer consists of the remaining N decentralized switches, connected end-to-end, and connected to the central switch, forming a "2N+1" dual-layer spider web topology consisting of an MMS+SV+GOOSE+IEEE1588 network.

[0157] The process of determining N in this embodiment includes:

[0158] The first type of protection, measurement and control device in the interval layer (such as line protection) and the corresponding merging unit, intelligent terminal, integrated intelligent device, etc. in the process layer are connected to a main switch, which can be regarded as a hybrid layer 1 composed of the first type of interval layer + process layer.

[0159] The second type of protection and measurement control device in the bay layer (such as busbar protection) and the corresponding merging unit in the process layer are connected to the second main switch, which can be regarded as a hybrid layer 2 composed of the second type of bay layer + process layer.

[0160] The third type of protection and measurement control device in the bay layer (such as transformer protection) and the merging unit corresponding to the process layer are connected to the third main switch, which can be regarded as a hybrid layer 3 composed of the third type of bay layer + process layer. ......

[0162] The N-1th type of protection, measurement and control device in the bay layer and the merging unit corresponding to the process layer are connected to the Nth main switch, which can be regarded as a hybrid layer N-1 composed of the N-1th type bay layer + process layer.

[0163] In addition, the station control layer devices are connected to 1 main switch. Because N-1 main switches + 1 station control layer main switch + N-1 redundant switches + 1 redundant switch + 1 central switch = 2N + 1 spider web, so N is determined by the number of connected protection and measurement and control devices;

[0164] The protection, measurement and control device includes: a protection device, a measurement and control device, and a protection and measurement integrated device.

[0165] The interval layer includes a protection device, and the protection device and the integrated protection and measurement device are provided with four communication interfaces, wherein the signal input terminal a is connected to the N-1 main switches of the process layer, and is connected to the MMS+SV+GOOSE+IEEE1588 network through the N-1 main switches of the process layer to obtain the required sampling values, and can send GOOSE messages to each intelligent switch and integrated intelligent device, as well as receive the control information of the station control layer, and send status information to the station control layer; the signal input terminal b is connected to the N-1 redundant switches of the process layer, and is connected to the MMS+SV+GOOSE+IEEE1588 network through the N-1 redundant switches of the process layer, which can ensure normal reception and transmission of information when the main switch fails; the signal input terminal c is connected to the mutual inductor group and the integrated intelligent device to directly obtain the sampling values when the network communication system fails; the signal input terminal d is connected to the intelligent switch and the integrated intelligent device to directly execute the action signal when the network communication system fails.

[0166] The monitoring host enters the MMS+SV+GOOSE+IEEE1588 network through the station control layer main switch and redundant switch, and communicates with the protection, measurement and control device, and the integrated protection and measurement device.

[0167] In this embodiment, the MMS+SV+GOOSE+IEEE1588 network is the substation network communication system.

[0168] The substation network communication system complies with the provisions of the substation communication protocol IEC61850.

[0169] like Figure 6 As shown in the figure, the information flows of the substation network system are:

[0170] 1. The merging unit and the integrated intelligent device of the process layer send voltage and current sampling value information (SV) and merging unit alarm information (GOOSE) to the protection device, measurement and control device, and integrated protection and measurement device of the interval layer.

[0171] 2. The intelligent terminal and the integrated intelligent device of the process layer send closing position information (GOOSE), opening and closing position information (GOOSE), locking information (GOOSE), intelligent terminal and switch alarm information (GOOSE) to the protection device, measurement and control device, and integrated protection and measurement device of the interval layer.

[0172] 3. The protection device and the integrated protection and measurement device at the interval layer send a protection tripping instruction (GOOSE) to the intelligent terminal and the integrated intelligent device at the process layer.

[0173] 4. The protection device and integrated protection and monitoring device of the bay layer send protection action logic and intermediate node information (MMS) and protection device status monitoring information (MMS) to the monitoring host of the station control layer.

[0174] 5. The measurement and control device and the integrated measurement and protection device of the interval layer send switch control instructions (GOOSE) to the intelligent terminal and the integrated intelligent device of the process layer.

[0175] 6. The measurement and control device and the integrated measurement and protection device of the bay layer send cross-bay interlocking information (GOOSE) to other measurement and control devices and integrated measurement and protection devices of the bay layer.

[0176] 7. The measurement and control device and the integrated protection and measurement device of the interval layer send the alarm information (MMS) of the measurement and control device itself, the effective value (MMS) of voltage and current, and the status monitoring information (MMS) of the merging unit, intelligent terminal, integrated intelligent device, protection, measurement and control device, and integrated protection and measurement device to the monitoring host of the station control layer.

[0177] 8. The monitoring host and remote control device of the station control layer send functional pressure plate activation and deactivation instructions and set values (MMS) and switch control instructions (MMS) to the measurement and control device and integrated protection and measurement device of the interval layer, and send protection device functional pressure plate activation and deactivation instructions (MMS) to the protection device and integrated protection and measurement device of the interval layer.

[0178] 9. The merging unit and the integrated intelligent device of the process layer send voltage sampling value information (SV) and merging unit status monitoring information (GOOSE) to the dynamic recording device of the process layer.

[0179] 10. The intelligent terminal and the integrated intelligent device of the process layer send the switch opening and closing position information (GOOSE), the status monitoring information (GOOSE) of the intelligent terminal and the status monitoring information (GOOSE) of the integrated intelligent device to the dynamic recording device of the process layer.

[0180] 11. The protection device and the integrated protection and measurement device of the interval layer send protection action logic and intermediate node information (MMS) and protection device status monitoring information (MMS) to the dynamic recording device of the process layer.

[0181] The intelligent terminal in this embodiment can use the existing CSD601, the merging unit can select the existing CSD602 or PRS-7390, the protection device can select the existing digital transformer protection device CSC-326G or CSC-150, and the protection measurement and control device can select PSL646U, etc.

[0182] Based on the same inventive concept, this embodiment further provides a network communication method for a smart substation, including:

[0183] When communicating based on the network communication system, a sending end and a receiving end are determined from the devices of the station control layer, the bay layer and the process layer of the smart substation;

[0184] Acquire the shortest path of information flow between the sending end and the receiving end based on the topology structure of the network communication system;

[0185] The information flow is transmitted along the acquired shortest path.

[0186] The information flows are set with different priorities according to their importance, and the priorities are from high to low as follows: protection tripping command, voltage and current sampling value information and status information, timing information, station control layer control command, fault information, and other information.

[0187] When a receiving device receives two or more information flows at the same time, it generates an information flow processing order based on the priority of the information flows, first processing the information flow with the highest priority. After processing is completed, the remaining information flows are received and processed in descending order of priority.

[0188] The information processing mechanism of the substation network system is:

[0189] Under normal circumstances, the information flow should be transmitted according to the "nearest principle".

[0190] The weight of each switch is set to the same value, the information flow transmission path is the path from the sending device to the receiving device, and the transmission path should be the shortest path. The switch includes a central switch and a non-central switch.

[0191] The calculation idea of the shortest path is:

[0192] Before calculation, the starting point and the end point are determined, and the path value is set to 0. Based on the network topology, the path is determined. The path value increases with the corresponding weight after each switch until the end point is reached and the path value result is determined.

[0193] The path value of the shortest path is the minimum value of all line path values, that is, the number of switches passed through is the least.

[0194] This idea is adopted to use Dijkstra's algorithm to traverse all paths from the starting point to the end point, calculate the path value of each path, and finally determine the shortest path.

[0195] like Figure 2 As shown, W represents the weight value of the switch, and W is a non-negative number. The calculation process is as follows Figure 3 shown.

[0196] Take a single-layer spider web structure as an example to illustrate the fault. When a link fails, Figure 4 As shown, A is the sending start point and B is the receiving end point:

[0197] 1. During normal operation, the sending device at A sends information to the receiving device at B. At this time, the information is transmitted using the shortest path, and the information flow is A→B.

[0198] 2. When the communication link between A and B fails, switch A cannot receive the response message sent by switch B in the original A→B communication link. If switch A determines that it has not received a response message from switch B within a set time T, it determines that the communication link A→B has failed.

[0199] 3. At this time, switch A determines the shortest path to switch B based on the shortest path algorithm and successfully receives the response information from switch B, generating an information flow path A→G→B.

[0200] 4. When determining the information flow path, switch A sends the information sent by the sending device to the receiving device connected to switch B along the path A→G→B.

[0201] After determining the shortest path between the sending and receiving ends, it is determined whether the main switch or the redundant switch will transmit the information flow. When the main switch or the redundant switch fails, the main switch and the redundant switch will serve as backup for each other.

[0202] Take the failure of the main switch in the decentralized switch as an example. The main switch and the redundant switch are backups for each other. When the main switch in the decentralized switch fails, the sender can send information to the redundant switch and forward the information to the destination address.

[0203] The conversion process is as follows Figure 5 As shown, the conversion steps are as follows:

[0204] 1. During normal operation, the sender sends information to the main switch. The main switch receives the information sent by the sender, checks the message frame header, and forwards it to the destination address.

[0205] 2. If the primary switch fails, the sender sends information to the primary switch but does not receive a response from the primary switch within a set time. The sender then determines that the primary switch has failed. The sender then sends the information to the redundant switch through another port. The redundant switch receives the information, checks the message frame header, and forwards it to the destination address.

[0206] Information processing recovery mechanism after repair is completed:

[0207] When a communication link fails, the switch selects the shortest path for data forwarding and periodically sends confirmation messages to the switch connected to the faulty link. When the faulty communication link is repaired, the switch receives a response message from the switch connected to the repaired link, confirming that the faulty link has been repaired. The switch then compares the paths in the path table and determines the latest shortest path for forwarding.

[0208] To improve the utilization of redundant switches during normal operation, the sending end sends high-priority messages to the redundant switch based on their importance, which then forwards them to their destination. Lower-priority messages are sent to the primary switch, which then forwards them to their destination. This effectively reduces the queuing time for low-priority messages and improves the utilization of the redundant switches.

[0209] Here are the steps:

[0210] 1. The sender generates messages of different priorities based on the message type and classifies them into high-priority and low-priority messages by comparing the priority flags.

[0211] 2. The sending end sends the high-priority message to port B connected to the redundant switch, and then sends it to the redundant switch through port B.

[0212] 3. At the same time, the sending end sends the low-priority message to port A connected to the main switch, and sends it to the main switch through port A.

[0213] The two types of messages can be sent simultaneously through different ports, effectively improving sending efficiency and reducing queuing time.

[0214] When the number of switches in a "2N+1" two-layer spider web topology is determined, all point-to-point path diagrams and corresponding path values can be calculated in advance and stored in a path table within the switch. In the event of a communication link failure, the path table can be queried to eliminate the faulty path without requiring calculation to quickly determine the shortest path, thereby rapidly restoring normal communication.

[0215] The main innovations provided in this embodiment include:

[0216] 1. Smart substation network communication system based on a "2N+1" two-layer spider web topology. The smart substation system consists of one central switch and 2N decentralized switches. The 2N decentralized switches are divided into N main switches and N redundant switches. Each of the N main switches and redundant switches includes one station control layer switch and N-1 process layer switches. The N main switches are connected end-to-end via optical fiber to form a ring structure at the upper layer, and the N redundant switches are connected end-to-end via optical fiber to form a ring structure at the lower layer. The central switch is connected to each decentralized switch at the upper and lower layers via optical fiber, forming a "2N+1" two-layer spider web topology.

[0217] 2. The information processing mechanism of the smart substation communication system based on the "2N+1" double-layer spider web. This information processing mechanism uses a switch-based shortest path search algorithm to search for the shortest path for information flows. Leveraging the high redundancy of the "2N+1" double-layer spider web topology, it can search for alternative shortest paths and restore normal communication when a communication link in the network communication system fails, ensuring the normal and reliable operation of the smart substation communication system.

[0218] 3. The information processing mechanism for the failure of a non-central switch in the "2N+1" double-layer spider web-based smart substation communication system. When a non-central switch fails, if the sending end fails to receive a response from the primary switch within the set response time, the primary switch is deemed to have failed. The sender then sends the information to the redundant switch via a redundant port, and upon receiving a response, the switchover is complete.

[0219] 4. A path table for the information processing mechanism of the "2N+1" dual-layer spider web-based smart substation communication system. When the "2N+1" dual-layer spider web topology and the number of switches are determined, all calculated point-to-point paths and their corresponding path values are pre-written into the path table and stored within the switches. This allows for the rapid identification of alternative shortest paths and timely restoration of normal communication in the event of a communication link failure.

[0220] 5. The automatic recovery mechanism for information processing after the communication link is repaired in the "2N+1" double-layer spider web-based smart substation communication system. When a communication link fails, the switch selects another shortest path for data forwarding and periodically sends confirmation messages via the faulty link to the switch connected to the faulty link. When the faulty communication link is repaired, the switch receives a response message from the switch connected to the repaired link, confirming that the faulty link has been repaired. The switch then compares paths using the path table to determine the latest shortest path for forwarding.

[0221] 6. The automatic recovery mechanism for information processing after the decentralized switch is repaired in the "2N+1" double-layer spider web-based smart substation communication system. When the decentralized switch's primary switch fails, the transmitter periodically sends confirmation messages to the failed primary switch. When the primary switch is repaired, the transmitter receives a response from the repaired primary switch, confirming that the primary switch has been repaired. It then redirects the information originally destined for the primary switch to the redundant switch instead.

[0222] 7. A solution for improving redundant switch utilization in a smart substation communication system based on a "2N+1" dual-layer spider web. This solution is characterized in that the sending end sends high-priority messages to the redundant switch based on their importance, which then forwards them to their destination. Low-priority messages are sent to the primary switch, which then forwards them to their destination.

[0223] 8. A bay layer structure for the network communication system of a smart substation system based on a "2N+1" double-layer spider web structure. The bay layer structure configures switches by bay type, using a hybrid bay layer + process layer information configuration scheme. The transformer groups, intelligent switches, and integrated intelligent devices of the process layer, and the protection, measurement and control devices, metering devices, condition monitoring devices, and integrated protection and measurement devices of the bay layer, are connected to the process layer switches via optical fibers.

[0224] 9. A hybrid information configuration scheme for a "2N+1" dual-layer spider web-based intelligent substation system network communication system. In this hybrid information configuration scheme, the hybrid information flow in the bay layer + process layer + configuration switch structure should include different information flows based on the MMS, SV, GOOSE, and IEEE1588 standards.

[0225] 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0226] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0227] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0228] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0229] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0230] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A network communication system for a smart substation, characterized in that: The network communication system can carry out MMS, SV, GOOSE and IEEE1588 communications; The network communication system includes: a station control layer, a bay layer and a process layer of the smart substation, as well as a central switch, multiple main switches and redundant switches provided for each main switch; All main switches and redundant switches are connected to the central switch; Each main switch is connected end to end to form a main switching layer; each redundant switch is connected end to end to form a redundant switching layer; Each device of the station control layer, bay layer and process layer of the smart substation is connected to a main switch and a redundant switch corresponding to the main switch; The equipment in the process layer includes: mutual inductor group, intelligent switch and integrated intelligent device; The equipment of the spacer layer includes: protection device, measurement and control device, metering device, status monitoring device, dynamic recording device and integrated protection and measurement device; The equipment of the station control layer includes: synchronous clock, monitoring host and telecontrol device; The protection device and the integrated protection and measurement device are respectively provided with four communication interfaces, the four communication interfaces including: a signal input terminal a, a signal input terminal b, a signal input terminal c and a signal input terminal d; The signal input terminal a is connected to a process layer main switch, and is used to obtain sampling values from the network communication system through the process layer main switch, send GOOSE messages to the intelligent switches and integrated intelligent devices in the process layer, and exchange information with the station control layer; The signal input terminal b is connected to the process layer redundant switch corresponding to the process layer main switch, and is used to connect to the network communication system through the process layer redundant switch to receive and send information when the process layer main switch fails; The signal input terminal c is connected to the mutual inductor group and the integrated intelligent device in the process layer, and is used to directly obtain the sampled value when the network communication system fails; The signal input terminal d is connected to the intelligent switch and the integrated intelligent device in the process layer, and is used to directly execute the action signal when the network communication system fails; The monitoring host is connected to the network communication system through the station control layer main switch and the station control layer redundant switch.

2. The system according to claim 1, wherein The main switch includes multiple process layer main switches and one station control layer main switch; The redundant switches include: a process layer redundant switch provided for each process layer main switch and a station control layer redundant switch provided for the station control layer main switch.

3. The system according to claim 2, wherein: The devices at the bay layer and the process layer are provided with at least three communication interfaces, two of which are connected to the process layer main switch and the process layer redundant switch corresponding to the process layer main switch, respectively, and the third communication interface is connected to the protection device corresponding to the devices at the bay layer and the process layer; The equipment of the station control layer is provided with at least two communication interfaces, which are respectively connected to the station control layer main switch and the station control layer redundant switch corresponding to the station control layer main switch.

4. The system according to claim 1, wherein: The number of the main switches and redundant switches is determined by the number of protection and measurement control devices; Among them, the protection, measurement and control device includes: a protection device, a measurement and control device, and an integrated protection and measurement device.

5. The system according to claim 1, wherein: When communicating through the network communication system, the sending end sends high-priority information to the redundant switch, which is forwarded to the receiving end through the redundant switch; and sends low-priority information to the main switch, which is forwarded to the receiving end through the main switch.

6. The system according to claim 1, wherein: The main switch and the redundant switch serve as backup for each other.

7. The system according to claim 1, wherein: The devices in the network communication system are connected via optical fibers.

8. A network communication method for a smart substation, characterized in that: include: When communicating based on the network communication system according to any one of claims 1 to 7, a sending end and a receiving end are determined from the devices of the station control layer, the bay layer and the process layer of the smart substation; Acquire the shortest path of information flow between the sending end and the receiving end based on the topology structure of the network communication system; Transmitting the information flow along the acquired shortest path; The obtaining of the shortest path of the information flow between the sending end and the receiving end based on the topology structure of the network communication system includes: Pre-generate a path table based on the topological structure of the network communication system; Reading the shortest path of the information flow between the sending end and the receiving end in the path table; When a communication link in the shortest path fails, re-obtaining a shortest path that does not include the failed link based on the path table; The generation of the path table includes: Based on the topology of the network communication system, the same weight is set for the central switch and the non-central switch, and the Dijkstra algorithm is used to traverse all paths of the information flow from the sender to the receiver. Count the number of central switches and non-central switches passed through each path respectively; Obtain corresponding path values based on the number of central switches and non-central switches passed through in each path, and the corresponding weights; Arrange all path values in ascending order and store the corresponding paths to generate a path table; Wherein, the non-central switch includes: a main switch and a redundant switch; Determining whether a communication link in the shortest path has failed includes: When transmitting information based on the shortest path, if the sending end cannot receive the response information sent by the receiving end within a set time, it is determined that a failure occurs in the communication link between the sending end and the receiving end.

9. The method according to claim 8, wherein When a communication link in the shortest path fails, after re-acquiring the shortest path excluding the failed link based on the path table, the method further includes: The sending end sends a confirmation message to the main switch, redundant switch or central switch connected to the faulty link through the faulty link within the set link access interval; When the faulty link is repaired, the sending end will receive a response message from the main switch, redundant switch or central switch connected to the repaired link, and then determine that the faulty link has been repaired and update the shortest path through the path table.

10. The method according to claim 8, wherein The transmitting the information flow along the acquired shortest path includes: When the receiving end receives two or more information flows simultaneously, it generates a processing order for the information flows based on the priority of each information flow; When both the primary switch and the redundant switch connected to the receiving end are operating normally, the information flow with a high priority is sent to the redundant switch according to the processing order, and is transmitted to the receiving end through the redundant switch along the obtained shortest path; the information flow with a low priority is sent to the primary switch, and is transmitted to the receiving end through the primary switch along the obtained shortest path; When the main switch or redundant switch connected to the receiving end fails, the information flow is sent to the redundant switch or main switch that serves as a backup for each other; Among them, the priorities of the information flows from high to low are: protection tripping command, SV sampling value and status information, timing information, station control layer control command, and fault information.

11. The method according to claim 10, wherein The main switch / redundant switch fails, including: If the sending end does not receive a response from the primary switch / redundant switch within the set time, the primary switch / redundant switch fails.

12. The method according to claim 11, wherein After the main switch / redundant switch fails, the method further includes: The sending end sends a confirmation message to the faulty primary switch / redundant switch within the set access interval; when the primary switch / redundant switch is repaired, the sending end will receive a response message sent by the repaired primary switch / redundant switch and determine that the primary switch / redundant switch has been repaired.

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