Line protection method and system using 5G channel adaptive optimization protection function

Abstract

The present invention discloses a line protection method and system using a 5G channel adaptive optimization protection function. The technical solution adopted by the present invention is: the line protection device is configured with optical fiber and 5G channel at the same time, the protection devices on both sides of the line exchange data through the optical fiber channel, and the associated line protection devices in the substations at both ends are connected to the same 5G network; when the optical fiber channel is normal, the optical fiber channel is used to realize longitudinal differential protection, and at the same time, a heartbeat message is sent in the 5G network to test the communication status; when the optical fiber channel is abnormal, the 5G network is activated, and the 5G network is used to realize communication with the devices in the substation and the opposite station; according to the three states of the 5G network, the corresponding protection information is transmitted to realize the corresponding protection function. The present invention uses the 5G network between stations and within stations to transmit differentiated protection information, forming a series of protection schemes of "optical fiber differential-5G differential-5G longitudinal connection-5G dual-circuit backup acceleration within the station", which can adapt to different channel conditions and optimize the corresponding protection elements.

Description

Technical Field

[0001] The present invention belongs to the technical field of line protection in power grid relay protection, and in particular to a line protection method and system utilizing a 5G channel adaptive optimization protection function. Background Art

[0002] Longitudinal current differential protection is the most widely used type of main protection for power transmission lines. Its theoretical basis is the KCL theorem. It works reliably and has good selectivity. At present, optical fiber channels are generally used for line differential protection, but optical fiber channels have problems such as high construction cost, complex fault troubleshooting, and single channel type. When the optical fiber channel is abnormal, the longitudinal differential protection fails and cannot achieve full-line rapid action. In this case, 5G communication networks can be used to improve line protection functions.

[0003] 5G communication has excellent characteristics such as low latency and large bandwidth. Relying on the 5G network within the station and between the two end stations, the main protection can be strengthened and the protection reliability can be improved. However, 5G communication also has the characteristics of unstable available bandwidth and transmission delay, which requires the protection device to dynamically adjust the protection logic according to the actual communication situation. Summary of the invention

[0004] In order to solve the technical problems existing in the above-mentioned prior art, the present invention proposes a line protection method and system using the adaptive optimization protection function of the 5G channel, which uses differentiated protection information transmitted by the 5G network between stations and within the station to form a series of protection schemes of "fiber differential-5G differential-5G longitudinal connection-5G dual-circuit backup acceleration within the station" to adapt to different channel conditions and optimize the corresponding protection elements.

[0005] In order to achieve the above-mentioned object of the invention, a technical solution adopted by the present invention is:

[0006] The line protection method using the 5G channel adaptive optimization protection function comprises the following steps:

[0007] 1) The line protection device is equipped with both optical fiber and 5G channels. The protection devices on both sides of the line exchange data through the optical fiber channel, and the associated line protection devices in the substations at both ends are connected to the same 5G network;

[0008] 2) When the optical fiber channel is normal, the optical fiber channel is used to implement longitudinal differential protection, and a heartbeat message is sent in the 5G network to test the communication status, but protection information is not transmitted to save 5G bandwidth resources and traffic;

[0009] 3) When the fiber channel is abnormal, the 5G network is activated and the 5G network is used to communicate with the devices in the local station and the opposite station;

[0010] 4) According to the three states of the 5G network, the corresponding protection information is transmitted to realize the corresponding protection functions.

[0011] Further, in step 2), when the optical fiber channel is normal, the device only sends a heartbeat message in the 5G channel to test the communication status, where the communication status includes: packet loss rate and transmission delay.

[0012] Furthermore, in step 4), according to the three states of the 5G network, corresponding protection information is transmitted to implement corresponding protection functions, and the specific contents are:

[0013] When the packet loss rate and delay of the 5G communication channel between the substations at both ends meet the requirements, the protection devices on both sides of the line use the 5G channel to form longitudinal differential protection;

[0014] When the 5G communication channel between the substations at both ends only meets the delay requirement, the protection devices on both sides of the line use the 5G channel to transmit the switching value to form the longitudinal distance and longitudinal zero-sequence protection;

[0015] When the packet loss rate and delay of the 5G communication channel between the substations at both ends do not meet the requirements, the 5G network in the station is used to exchange current information with the protection device of another loop in the station to form a double-loop backup acceleration criterion. When the criterion is met, the line backup protection is accelerated.

[0016] Furthermore, the double-circuit line backup acceleration criterion is:

[0017]

[0018] In the above formula, is the line current, is the current of another loop, k is the braking coefficient;

[0019] When the double-circuit line backup acceleration criteria are met, it is determined that the fault occurs within the line area, shortening the backup protection action time and speeding up the fault removal.

[0020] Another technical solution adopted by the present invention is: a line protection system using a 5G channel adaptive optimization protection function, which includes:

[0021] Line protection device configuration unit: The line protection device is configured with optical fiber and 5G channels at the same time. The protection devices on both sides of the line exchange data through the optical fiber channel, and the associated line protection devices in the substations at both ends are connected to the same 5G network;

[0022] Fiber channel normal processing unit: When the fiber channel is normal, the fiber channel is used to implement longitudinal differential protection, and heartbeat messages are sent in the 5G network to test the communication status;

[0023] Fiber channel abnormality processing unit: When the fiber channel is abnormal, the 5G network is activated and the 5G network is used to communicate with the devices in the local station and the opposite station;

[0024] Protection unit: According to the three states of the 5G network, it transmits corresponding protection information and implements corresponding protection functions.

[0025] The present invention has the beneficial effects: based on the evaluation of 5G communication status, the present invention utilizes differentiated protection information of 5G network transmission between stations and within stations to form a series of protection schemes of "fiber differential-5G differential-5G longitudinal connection-5G dual-circuit backup acceleration within the station" to adapt to different channel conditions and optimize the corresponding protection elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a flow chart of the method of the present invention;

[0027] Figure 2 It is a structural block diagram of the system of the present invention. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] Example 1

[0030] This embodiment provides a line protection method using a 5G channel adaptive optimization protection function, such as Figure 1 As shown, the steps are as follows:

[0031] Step 1: The line protection device is configured with both optical fiber and 5G channels, and the associated line protection devices in the local station and the opposite station are connected to a 5G-based communication network;

[0032] Step 2: When the optical fiber channel is normal, the optical fiber channel is used to implement longitudinal differential protection, and a heartbeat message is sent in the 5G network to test the communication status, including the packet loss rate and transmission delay;

[0033] Step 3. When the device detects an abnormality in the optical fiber channel, it activates the 5G network and uses the 5G network to exchange protection information with other devices. The specific situation depends on the communication conditions: 1. When the 5G packet loss rate and delay meet the requirements, the devices on both sides of the line use the 5G channel to form longitudinal differential protection; 2. When only the delay of the 5G channel meets the requirements, the devices on both sides of the line use the 5G channel to transmit the switching quantity to form longitudinal distance and longitudinal zero-sequence protection; 3. When the packet loss rate and delay of the 5G channel between the two end stations do not meet the requirements, for double-circuit lines, the 5G network in the station can be used to form a double-circuit line backup acceleration criterion to accelerate the line backup protection;

[0034] The double-circuit line backup acceleration criteria described in step 4 and step 3 are:

[0035]

[0036] In the above formula, is the line current, is the current of another loop, k is the braking coefficient;

[0037] When the double-circuit line backup acceleration criterion is met, it is judged that the fault occurs in the line area. At this time, the protection device shortens the backup protection action time as much as possible to speed up the removal of the fault.

[0038] Example 2

[0039] This embodiment provides a line protection system using a 5G channel adaptive optimization protection function, which consists of a line protection device configuration unit, a fiber channel normal processing unit, a fiber channel abnormal processing unit, and a protection unit.

[0040] Line protection device configuration unit: The line protection device is configured with optical fiber and 5G channels at the same time. The protection devices on both sides of the line exchange data through the optical fiber channel, and the associated line protection devices in the substations at both ends are connected to the same 5G network;

[0041] Fiber channel normal processing unit: When the fiber channel is normal, the fiber channel is used to implement longitudinal differential protection, and heartbeat messages are sent in the 5G network to test the communication status;

[0042] Fiber channel abnormality processing unit: When the fiber channel is abnormal, the 5G network is activated and the 5G network is used to communicate with the devices in the local station and the opposite station;

[0043] Protection unit: According to the three states of the 5G network, it transmits corresponding protection information and implements corresponding protection functions.

[0044] In the normal processing unit of the optical fiber channel, when the optical fiber channel is normal, the device only sends heartbeat messages in the 5G channel to test the communication status, where the communication status includes: packet loss rate and transmission delay.

[0045] In the protection unit, according to the three states of the 5G network, the corresponding protection information is transmitted to realize the corresponding protection functions. The specific contents are:

[0046] When the packet loss rate and delay of the 5G communication channel between the substations at both ends meet the requirements, the protection devices on both sides of the line use the 5G channel to form longitudinal differential protection;

[0047] When the 5G communication channel between the substations at both ends only meets the delay requirement, the protection devices on both sides of the line use the 5G channel to transmit the switching value to form the longitudinal distance and longitudinal zero-sequence protection;

[0048] When the packet loss rate and delay of the 5G communication channel between the substations at both ends do not meet the requirements, the 5G network in the station is used to exchange current information with the protection device of another loop in the station to form a double-loop backup acceleration criterion. When the criterion is met, the line backup protection is accelerated.

[0049] The double-circuit line backup acceleration criterion is:

[0050]

[0051] In the above formula, is the line current, is the current of another loop, k is the braking coefficient;

[0052] When the double-circuit line backup acceleration criteria are met, it is determined that the fault occurs within the line area, shortening the backup protection action time and speeding up the fault removal.

[0053] Those skilled in the art to which the present invention relates may make various modifications or additions to the specific embodiments described or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

Claims

1. A line protection method using a 5G channel adaptive optimization protection function, characterized in that: The following steps are involved: 1) The line protection device is equipped with both optical fiber and 5G channels. The protection devices on both sides of the line exchange data through the optical fiber channel, and the associated line protection devices in the substations at both ends are connected to the same 5G network; 2) When the optical fiber channel is normal, the optical fiber channel is used to implement longitudinal differential protection, and a heartbeat message is sent in the 5G network to test the communication status; 3) When the optical fiber channel is abnormal, the 5G network is activated and the 5G network is used to communicate with the devices in the substation and the opposite substation; 4) According to the three states of the 5G network, the corresponding protection information is transmitted to realize the corresponding protection function; In step 4), according to the three states of the 5G network, the corresponding protection information is transmitted to implement the corresponding protection function. The specific contents are: When the packet loss rate and delay of the 5G communication channel between the substations at both ends meet the requirements, the protection devices on both sides of the line use the 5G channel to form longitudinal differential protection; When the 5G communication channel between the substations at both ends only meets the delay requirement, the protection devices on both sides of the line use the 5G channel to transmit the switching value to form the longitudinal distance and longitudinal zero-sequence protection; When the packet loss rate and delay of the 5G communication channel between the substations at both ends do not meet the requirements, the 5G network in the station is used to exchange current information with the protection device of another loop in the station to form a double-loop backup acceleration criterion. When the criterion is met, the line backup protection is accelerated.

2. The line protection method using the 5G channel adaptive optimization protection function according to claim 1 is characterized in that: In step 2), when the optical fiber channel is normal, the device only sends a heartbeat message in the 5G channel to test the communication status, where the communication status includes: packet loss rate and transmission delay.

3. The line protection method using the 5G channel adaptive optimization protection function according to claim 1 is characterized in that: The double-circuit line backup acceleration criterion is: In the above formula, is the line current, is the current of another loop, k is the braking coefficient; When the double-circuit line backup acceleration criteria are met, it is determined that the fault occurs within the line area, shortening the backup protection action time and speeding up the fault removal.

4. A line protection system using 5G channel adaptive optimization protection function, characterized in that: include: Line protection device configuration unit: The line protection device is configured with optical fiber and 5G channels at the same time. The protection devices on both sides of the line exchange data through the optical fiber channel, and the associated line protection devices in the substations at both ends are connected to the same 5G network; Fiber channel normal processing unit: When the fiber channel is normal, the fiber channel is used to implement longitudinal differential protection, and a heartbeat message is sent in the 5G network to test the communication status; Fiber channel abnormality processing unit: When the fiber channel is abnormal, the 5G network is activated and the 5G network is used to communicate with the devices in the local station and the opposite station; Protection unit: according to the three states of the 5G network, transmits corresponding protection information and implements corresponding protection functions; In the protection unit, according to the three states of the 5G network, the corresponding protection information is transmitted to realize the corresponding protection functions. The specific contents are: When the packet loss rate and delay of the 5G communication channel between the substations at both ends meet the requirements, the protection devices on both sides of the line use the 5G channel to form longitudinal differential protection; When the 5G communication channel between the substations at both ends only meets the delay requirement, the protection devices on both sides of the line use the 5G channel to transmit the switching value to form the longitudinal distance and longitudinal zero-sequence protection; When the packet loss rate and delay of the 5G communication channel between the substations at both ends do not meet the requirements, the 5G network in the station is used to exchange current information with the protection device of another loop in the station to form a double-loop backup acceleration criterion. When the criterion is met, the line backup protection is accelerated.

5. The line protection system using the 5G channel adaptive optimization protection function according to claim 4 is characterized in that: In the normal processing unit of the optical fiber channel, when the optical fiber channel is normal, the device only sends heartbeat messages in the 5G channel to test the communication status, where the communication status includes: packet loss rate and transmission delay.

6. The line protection system using 5G channel adaptive optimization protection function according to claim 4 is characterized in that: The double-circuit line backup acceleration criterion is: In the above formula, is the line current, is the current of another loop, k is the braking coefficient; When the double-circuit line backup acceleration criteria are met, it is determined that the fault occurs within the line area, shortening the backup protection action time and speeding up the fault removal.

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