CN114554585B - Data synchronization method for differential protection of 5G communication line - Google Patents
Data synchronization method for differential protection of 5G communication line Download PDFInfo
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- H—ELECTRICITY
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- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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Abstract
The invention discloses a data synchronization method for differential protection of a 5G communication line, which aims to solve the problems of frame loss, frame error and unfixed time delay of data transmission of a protection device in a 5G communication network. It comprises the following steps: the time setting system is used for carrying out time setting treatment on a protection device in the 5G communication network; collecting data by using the protection device after time synchronization, and transmitting the data collected by the protection device through a data receiving channel; judging the channel effectiveness according to the data transmitted in the data receiving channel, and opening or locking the differential protection function; performing fault tolerance processing on data received by a protection device in a data receiving channel on the basis of opening a differential protection function; and selecting differential synchronous sampling points of protection devices at two ends of the data receiving channel according to the fault-tolerant processed data, and synchronizing the data of the protection devices. The invention can effectively reduce the influence of frame loss and frame error during the data transmission of the 5G network, realize the data synchronization of differential protection and improve the reliability of differential protection.
Description
Technical Field
The invention relates to a data synchronization method for differential protection of a 5G communication line, and belongs to the technical field of relay protection of power systems.
Background
With the rapid development of 5G communication networks in the last years, relay protection professions have also begun to study the possibility of implementing differential protection over 5G communication networks. The 5G network communication has no limitation of a ground line structure, has the advantages of strong non-line-of-sight transmission capability, short deployment period, strong natural disaster resistance capability, safe transmission and the like, and along with the development of 5G technology, the 5G communication can realize millisecond-level time delay rapid and reliable data interaction, has higher signal transmission quality, and can completely meet the application requirements of the differential protection function of relay protection. However, the 5G communication network performs data transmission through the base station and the 5G network, and transmission data transmitted from one relay protection device to the other relay protection device has the conditions of frame loss, single frame, multiple frames and the like, so that new requirements are put on relay protection synchronous data.
The differential protection synchronous data at present is realized on the basis of optical fiber transmission, the optical fiber data transmission has reliability and stability, the transmission delay can be calculated, and the synchronous data required by differential protection is pushed back and forth through the calculated transmission delay, for example, the data synchronization method of the digital optical fiber differential protection device of China invention patent with the publication number of CN101534003A and the data synchronization method of the digital optical fiber differential protection clock power method of China invention with the publication number of CN101540500A are disclosed. Because the data transmission of the 5G network passes through the base station and the corresponding 5G communication network, the transmission delay is not fixed, so the existing synchronization scheme is difficult to apply to the 5G network, and an adaptive differential protection data synchronization method is required to be researched according to the characteristics of the 5G network.
Disclosure of Invention
In order to solve the problems of frame loss, frame error and unfixed time delay of the transmission data of the protection device in the 5G communication network, the invention provides a data synchronization method for differential protection of a 5G communication line, which is used for carrying out a series of processing on the data acquired by the protection device, judging the synchronization point number required by the differential protection from the data, effectively reducing the influence of frame loss and frame error during the data transmission of the 5G network, realizing the data synchronization of the differential protection and improving the reliability of the differential protection.
In order to solve the technical problems, the invention adopts the following technical means:
the invention provides a data synchronization method for differential protection of a 5G communication line, which comprises the following steps:
the time setting system is used for carrying out time setting treatment on a protection device in the 5G communication network;
collecting data by using the protection device after time synchronization;
establishing a data receiving channel between protection devices at any two ends of the same line through a 5G communication network, and transmitting data acquired by the protection devices through the data receiving channel;
judging the channel effectiveness according to the data transmitted in the data receiving channel, and opening or locking the differential protection function;
performing fault tolerance processing on data received by a protection device in a data receiving channel on the basis of opening a differential protection function;
and selecting differential synchronous sampling points of protection devices at two ends of the data receiving channel according to the fault-tolerant processed data, and synchronizing the data of the protection devices.
Furthermore, each port of each line in the 5G communication network is configured with a protection device with a differential protection function, and all the protection devices are connected into a time synchronization system, wherein the time synchronization system adopts a GPS time synchronization system or a Beidou time synchronization system.
Further, the method for acquiring data by using the protection device after time synchronization comprises the following steps:
when the time setting of the protection device is successful, taking the next whole second time after the time setting is successful as the sampling initial time of the protection device, zeroing the sampling point serial number of the protection device, and configuring a time setting success mark for the protection device;
collecting data according to a preset sampling frequency from the initial sampling time through a protection device, and obtaining a sampling point serial number corresponding to the data;
in the sampling process, the whole second time is used as the sampling interruption time of the protection device, and the sampling point serial number is zeroed after each sampling interruption.
Further, the data collected by the protection device comprises a protection device serial number, a sampling point UTC time, electric quantity data collected by the sampling point, a time synchronization success mark, a starting mark and a CT disconnection mark.
Further, the method for judging the channel effectiveness according to the data transmitted in the data receiving channel comprises the following steps:
after a data receiving channel is connected, when the data collected by the protection devices at the two ends of the data receiving channel comprise time synchronization success marks, the protection devices at the two ends are considered to be synchronous in sampling, and a differential protection function is opened after time delay is T seconds, wherein T is a preset time length;
when no data is transmitted for continuous S seconds in one data receiving channel, locking the differential protection function, wherein S is a preset time length;
in a data receiving channel, the sampling point serial numbers in the received data are continuously judged by utilizing any end protection device, when the sampling point serial numbers of the data received by 2 continuous received frames are discontinuous, the number of the discontinuous frames is increased by 1 through a counter, and when the number of the discontinuous frames in 1 second is larger than a preset threshold value, the differential protection function is locked.
Further, after a data receiving channel opens differential protection, the method for performing fault-tolerant processing on the received data is as follows:
if the sampling point serial numbers in the data received by the protection device in the data receiving channel are continuous, filling the received data into a synchronous data buffer area according to the sequence;
when frame loss occurs in the data received by the protection device, calculating virtual data points through a difference method, inserting the virtual data points into the received data, and filling the data points into a synchronous data buffer area according to the sequence;
when the data received by the protection device has the wrong sequence frame, judging the effectiveness and the sequence of the wrong sequence frame, and filling the wrong sequence frame into the synchronous data buffer area after reordering the wrong sequence frame.
Further, the method for judging the validity and the sequence of the out-of-order frames comprises the following steps:
if the sampling point UTC time of the error sequence frame received by the protection device is after the sampling point UTC time of the D frame before the error sequence frame, the error sequence frame is considered to be effective, and the sequence of the error sequence frame is determined according to the sampling point sequence number and the sampling point UTC time of the error sequence frame;
if the sampling point UTC time of the error sequence frame received by the protection device is before the sampling point UTC time of the D frame before the error sequence frame, the error sequence frame is considered invalid, and the data of the error sequence frame is discarded.
Further, if the protection device on the line M side receives the data collected by the protection device on the line N side through the data receiving channel, the method for selecting the differential synchronous sampling point and synchronizing the data of the protection device includes:
acquiring and caching data subjected to fault-tolerant processing by the line N-side protection device through the line M-side protection device;
when the data quantity of the data of the N-side protection device cached by the M-side protection device reaches a cached data threshold value, taking the latest sampling point serial number of the N-side protection device in the cached data as a reference synchronous sampling point serial number of the M-side protection device;
subtracting fault-tolerant frame processing time from sampling point UTC time corresponding to the reference synchronous sampling point serial number to obtain differential synchronous starting time of the M-side protection device;
obtaining a differential synchronous sampling point serial number of the M-side protection device from data acquired by the M-side protection device according to the differential synchronous starting moment of the M-side protection device, and configuring a differential synchronous effective mark;
and after the differential synchronous sampling point serial numbers of the M-side protection devices are matched with the buffer sampling point serial numbers corresponding to the receiving N-side protection devices, carrying out differential protection data synchronization on the protection devices on two sides one by one.
Further, in the process of data synchronization of differential protection, when the serial number of the differential synchronization sampling point of the M-side protection device is larger than the serial number of the latest sampling point of the N-side protection device in the cached data, differential protection is locked for a short time, a differential synchronization invalid mark is configured, and the data after fault-tolerant processing of the N-side protection device is re-acquired and cached, and the differential synchronization is performed again.
The following advantages can be obtained by adopting the technical means:
the invention provides a data synchronization method for differential protection of a 5G communication line, which aims at solving the problems that the transmission data of a protection device in a 5G communication network has frame loss, frame error and unfixed time delay.
Drawings
FIG. 1 is a flow chart showing the steps of a method for data synchronization for differential protection of a 5G communication line according to the present invention;
fig. 2 is a schematic diagram of an application of differential synchronization of two-ended lines in an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings:
the invention provides a data synchronization method for differential protection of a 5G communication line, which is shown in fig. 1 and specifically comprises the following steps:
and step A, configuring a protection device with a differential protection function at each port of each line in the 5G communication network, as shown in fig. 2, and accessing all the protection devices into a time synchronization system, and performing time synchronization processing on each protection device through the time synchronization system. In the embodiment of the invention, the time setting system adopts a GPS time setting system or a Beidou time setting system.
And B, acquiring data by using the protection device after time synchronization.
In step B01, in order to ensure that the data transmitted to the 5G network is the data after time synchronization, after the protection device succeeds in time synchronization, the invention needs to delay to adjust the sampling time and put a time synchronization success flag. Specifically, the next whole second time after successful time setting is taken as the sampling initial time of the protection device, the sampling point serial number of the protection device is zeroed, a time setting success mark is configured for the protection device, and the unification of the sampling time and the sampling point serial number of the protection device at each end of the line is ensured.
And B02, collecting data according to a preset sampling frequency by the protection device from the initial sampling time, and obtaining a sampling point sequence number corresponding to the data. The data collected by the protection device comprises a protection device serial number, a sampling point UTC time, electric quantity data collected by the sampling point, a time synchronization success mark, a starting mark and a CT disconnection mark, wherein the electric quantity data mainly refer to three-phase current data of the position where the protection device is located, the time synchronization success mark indicates that the protection device is time synchronization success, the starting mark indicates that the protection device is started, and the CT disconnection mark indicates that the sampling of the protection device is interrupted.
And B03, taking the sampling interruption alignment mechanism of the protection device as the whole second time, taking the whole second time as the sampling interruption time of the protection device in the sampling process, and resetting the serial number of the sampling point to zero after each sampling interruption. The sampling interruption is carried out in whole seconds, so that the protection devices at all ends of the line can be ensured to sample or interrupt sampling at the same time, and the sampling synchronization is realized as much as possible.
And C, establishing a data receiving channel between the protection devices at any two ends of the same line through a 5G communication network, and transmitting the data acquired by the protection devices through the data receiving channel. The protection device at either end of the line may receive the data collected by the other port protection devices via the 5G communication network, record the received data report Wen Zhenshu, and temporarily buffer the received data for subsequent processing.
And D, judging the channel effectiveness according to the data transmitted in the data receiving channel, and opening or locking the differential protection function.
The channel validity judgment mainly comprises channel sampling synchronization standard judgment, channel interruption judgment and received data sampling point sequence number judgment, and the specific operation is as follows:
step D01, judging a channel sampling synchronization standard: after a data receiving channel is connected, when the local side protection device is successful in time setting and receives a time setting success mark of the opposite side protection device, namely, the protection devices at the two ends of the channel are provided with time setting success marks, sampling of the protection devices at the two ends is considered to be synchronous, and the differential protection function of the protection devices at the two ends of the data receiving channel is opened after time delay is T seconds, wherein T is a preset time length. Since a 50Hz frequency power system is adopted in China at present, the sampling period of the fundamental wave is 20 milliseconds (1000 milliseconds/50), and since the differential protection calculation differential current effective value is the differential current fundamental wave effective value, the open differential protection delay T is 2 times of the sampling period, namely 40 milliseconds, in order to ensure the calculation accuracy.
Step D02, judging channel interruption: and when the continuous S seconds in one data receiving channel do not have data transmission or the protection device at any end in the channel does not receive data continuously S seconds, judging that the channel is interrupted, locking the differential protection function, and then re-running the channel synchronization logic. S is the preset time length, S is taken according to the differential current calculation period of the differential protection, and S can take a fundamental wave sampling period time, namely 20 milliseconds, because the reliability of the differential protection is ensured.
Step D03, judging the sequence numbers of the received data sampling points: in a data receiving channel, the sampling point serial numbers in the received data are continuously judged by using any end protection device, when the sampling point serial numbers of the data received by 2 continuous received frames of the protection device are discontinuous, the number of the discontinuous frames is increased by 1 through a counter, when the number of the discontinuous frames in 1 second is larger than a preset threshold (generally, the total number of transmission frames in 1 second is taken to be 5), the data receiving channel is unstable, the differential protection function is locked, and then the channel synchronization logic is restarted. Assuming that the sampling point numbers of the data received by the protection device in 2 consecutive received frames are 15 and 19, respectively, since the numbers 15 and 19 are discontinuous, the number of frame discontinuities is automatically increased by 1, otherwise, if the sampling point numbers received by the protection device are 15 and 16, the number of frame discontinuities is not increased.
In step E, in step D, if the differential protection function is locked, the subsequent synchronization operation is not needed, and if the differential protection function is open, the fault tolerance processing is needed for the data received by the protection device in the data receiving channel.
And E01, if the sampling point serial numbers in the data received by the protection device in the data receiving channel are continuous, filling the received data into a synchronous data buffer area according to the sequence, and marking the data as the latest synchronous data so as to be used for differential protection.
Step E02, when one protection device does not receive the data sent by the opposite protection device at a certain time or within a certain period of time (10 ms), the protection device considers that the frame loss occurs, and at this time, different processes are required according to the frame loss:
(1) The processing method of the frame loss 1 point comprises the following steps: the protection device can receive the data of the previous frame and the next frame of the frame loss position, so that a virtual data point can be calculated through a difference method, the calculated virtual data point is inserted into the frame loss position and marked as virtual data, and then the virtual data point and the received data are filled into the synchronous data buffer area together in sequence for differential protection.
The calculation formula of the virtual data point is as follows:
Y k ＝Y k-1 +(X k -X k-1 )(Y k+1 -Y k-1 )/(X k+1 -X k-1 )
wherein Y is K Is a virtual data point, Y K-1 For the previous frame data of the lost frame, Y K+1 X is the data of the following frame of the lost frame K For the sampling point serial number corresponding to the current frame, X K-1 For the sampling point serial number, X corresponding to the previous frame K+1 And the sampling point sequence number corresponding to the next frame.
(2) The processing method of the frame loss multipoint comprises the following steps: when a frame loss condition of 2 frames or more occurs within a period of time (10 milliseconds), the differential protection is locked for a short time, and the locking time is 2 fundamental wave sampling periods. And after the short-time locking is finished, re-receiving the data of the opposite side protection device, and then re-judging and processing.
And E03, when the sampling point sequence numbers of the data received by the protection device are discontinuous, the protection device is considered to generate a wrong sequence frame, the validity and the sequence of the wrong sequence frame are required to be judged at the moment, and then the wrong sequence frame is reordered and then is filled into a synchronous data buffer area.
The validity and sequence of the error sequence frame are judged as follows:
(1) If the sampling point UTC time of the error sequence frame received by the protection device is after the sampling point UTC time of the D frame before the error sequence frame, or a correct frame is received within a certain time (a fundamental wave sampling period) after the error sequence frame occurs, the data of the error sequence frame is considered to be valid, and the sequence of the error sequence frame is determined according to the sampling point sequence number and the sampling point UTC time of the error sequence frame. Assuming that d=2, the protection device receives sampling points with sequence numbers 1, 2, 5, 3, and 4 in consecutive 5 frames, at this time, it can be seen that the sampling points with sequence numbers 2 and 5 and with sequence numbers 5 and 3 are discontinuous, if the sampling point UTC time corresponding to sequence number 5 is after the sampling point UTC time corresponding to sequence number 1, and the sampling point UTC time corresponding to sequence number 3 is after the sampling point UTC time corresponding to sequence number 2, the data corresponding to sequence numbers 5 and 3 are valid, and then the 5 frames of data are reordered according to the rule of continuity of the sampling points, namely 1, 2, 3, 4, and 5.
(2) If the sampling point UTC time of the error sequence frame received by the protection device is before the sampling point UTC time of the D frame before the error sequence frame, or the correct frame is not received within a certain time after the error sequence frame occurs, the data of the error sequence frame is considered to be invalid, and the data of the error sequence frame is discarded.
And F, selecting differential synchronous sampling points of the protection devices at two ends of the data receiving channel according to the fault-tolerant processed data, and synchronizing the data of the protection devices.
In the embodiment of the present invention, it is assumed that the protection device on the line M side receives the data collected by the protection device on the line N side through the data receiving channel, where M, N is used to distinguish two ends of the line, the method for selecting a differential synchronization sampling point and synchronizing the data of the protection device includes the following steps:
and F01, acquiring and caching the data subjected to fault-tolerant processing by the line N-side protection device through the line M-side protection device, wherein the data subjected to fault-tolerant processing are differential available data.
And F02, when the buffer time length reaches a buffer time threshold (30 milliseconds) or the data quantity of the buffer N-side protection device data of the M-side protection device reaches a buffer data threshold, pushing back forwards along the sampling point serial number of the current M-side protection device, and finding out the latest sampling point serial number from the data of the buffer N-side protection device, namely, the first differentially available sampling point serial number in the data of the N-side protection device, and taking the latest sampling point serial number as the reference synchronous sampling point serial number of the M-side protection device.
And F03, taking the processing time required in the fault-tolerant processing in the step E into consideration, and subtracting the fault-tolerant frame processing time (20 milliseconds) from the sampling point UTC time corresponding to the reference synchronous sampling point sequence number to obtain the differential synchronous starting time of the M side.
And F04, obtaining a differential synchronization sampling point serial number of the M side from the data acquired by the M side protection device according to the differential synchronization starting moment of the M side, and configuring a differential synchronization effective mark.
And F05, after the differential synchronous sampling point serial numbers of the M sides are matched with the buffer sampling point serial numbers corresponding to the receiving N side protection devices, carrying out differential protection data synchronization on the two side protection devices one by one sampling point in the subsequent differential synchronous calculation.
And F06, in the process of synchronizing differential protection data, sampling points are increased one by one, when the serial number of the differential synchronization sampling point of the M-side protection device is larger than the serial number of the latest sampling point of the N-side protection device, the differential protection is locked for a short time, a differential synchronization invalid mark is configured, and the step F is circulated to carry out differential synchronization again.
And G, after the synchronization of the differential protection data is completed, performing differential protection according to the synchronized data.
Compared with the prior art, the method does not need to rely on an optical fiber transmission technology, can directly acquire and transmit the data of the protection device through the 5G network, and aims at solving the problems that the protection device in the 5G communication network has frame loss, frame error and unfixed time delay when transmitting the data, firstly, the method judges the effectiveness of a data receiving channel, ensures the stability of the channel, reduces the influence of the abnormality of the 5G network transmission channel on differential protection, then processes the phenomena of frame loss, single frame, multiple frames, frame error and the like in the transmission data of the protection device through a fault-tolerant processing technology, improves the reliability and the integrity of the transmission data, ensures that the differential protection function can be smoothly realized, prevents the problem that the resources of the device are consumed when receiving the multiple frames of messages simultaneously, and finally, the method selects differential synchronization points and performs data synchronization according to the data after the fault-tolerant processing, thereby improving the reliability of the differential protection.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (8)
1. The data synchronization method for differential protection of the 5G communication line is characterized by comprising the following steps:
the time setting system is used for carrying out time setting treatment on a protection device in the 5G communication network;
collecting data by using the protection device after time synchronization;
establishing a data receiving channel between protection devices at any two ends of the same line through a 5G communication network, and transmitting data acquired by the protection devices through the data receiving channel;
judging the channel effectiveness according to the data transmitted in the data receiving channel, and opening or locking the differential protection function;
performing fault tolerance processing on data received by a protection device in a data receiving channel on the basis of opening a differential protection function;
selecting differential synchronous sampling points of protection devices at two ends of a data receiving channel according to the fault-tolerant processed data, and synchronizing the data of the protection devices;
the method for selecting the differential synchronous sampling point and synchronizing the data of the protection device comprises the steps of:
acquiring and caching data subjected to fault-tolerant processing by the line N-side protection device through the line M-side protection device;
when the data quantity of the data of the N-side protection device cached by the M-side protection device reaches a cached data threshold value, taking the latest sampling point serial number of the N-side protection device in the cached data as a reference synchronous sampling point serial number of the M-side protection device;
subtracting fault-tolerant frame processing time from sampling point UTC time corresponding to the reference synchronous sampling point serial number to obtain differential synchronous starting time of the M-side protection device;
obtaining a differential synchronous sampling point serial number of the M-side protection device from data acquired by the M-side protection device according to the differential synchronous starting moment of the M-side protection device, and configuring a differential synchronous effective mark;
and after the differential synchronous sampling point serial numbers of the M-side protection devices are matched with the buffer sampling point serial numbers corresponding to the receiving N-side protection devices, carrying out differential protection data synchronization on the protection devices on two sides one by one.
2. The method for data synchronization of differential protection of 5G communication lines according to claim 1, wherein a protection device with a differential protection function is configured at each port of each line in the 5G communication network, and all the protection devices are connected to a time synchronization system, wherein the time synchronization system adopts a GPS time synchronization system or a beidou time synchronization system.
3. The method for data synchronization for differential protection of 5G communication lines according to claim 1, wherein the method for collecting data using the protection device after time synchronization comprises:
when the time setting of the protection device is successful, taking the next whole second time after the time setting is successful as the sampling initial time of the protection device, zeroing the sampling point serial number of the protection device, and configuring a time setting success mark for the protection device;
collecting data according to a preset sampling frequency from the initial sampling time through a protection device, and obtaining a sampling point serial number corresponding to the data;
in the sampling process, the whole second time is used as the sampling interruption time of the protection device, and the sampling point serial number is zeroed after each sampling interruption.
4. The method for synchronizing data in differential protection of a 5G communication line according to claim 1, wherein the data collected by the protection device includes a protection device serial number, a sampling point UTC time, electrical quantity data collected by the sampling point, a time synchronization success flag, a start flag, and a CT disconnection flag.
5. The method for data synchronization for differential protection of 5G communication lines according to claim 1 or 4, wherein the method for channel validity discrimination based on the data transmitted in the data receiving channel comprises:
after a data receiving channel is connected, when the data collected by the protection devices at the two ends of the data receiving channel comprise time synchronization success marks, the protection devices at the two ends are considered to be synchronous in sampling, and a differential protection function is opened after time delay is T seconds, wherein T is a preset time length;
when no data is transmitted for continuous S seconds in one data receiving channel, locking the differential protection function, wherein S is a preset time length;
in a data receiving channel, the sampling point serial numbers in the received data are continuously judged by utilizing any end protection device, when the sampling point serial numbers of the data received by 2 continuous received frames are discontinuous, the number of the discontinuous frames is increased by 1 through a counter, and when the number of the discontinuous frames in 1 second is larger than a preset threshold value, the differential protection function is locked.
6. The method for data synchronization in differential protection of 5G communication lines according to claim 1 or 4, wherein after differential protection is opened for a data receiving channel, the method for performing fault tolerant processing on the received data is as follows:
if the sampling point serial numbers in the data received by the protection device in the data receiving channel are continuous, filling the received data into a synchronous data buffer area according to the sequence;
when frame loss occurs in the data received by the protection device, calculating virtual data points through a difference method, inserting the virtual data points into the received data, and filling the data points into a synchronous data buffer area according to the sequence;
when the data received by the protection device has the wrong sequence frame, judging the effectiveness and the sequence of the wrong sequence frame, and filling the wrong sequence frame into the synchronous data buffer area after reordering the wrong sequence frame.
7. The method for data synchronization for differential protection of 5G communication lines according to claim 6, wherein the method for determining validity and sequence of the out-of-order frames comprises:
if the sampling point UTC time of the error sequence frame received by the protection device is after the sampling point UTC time of the D frame before the error sequence frame, the error sequence frame is considered to be effective, and the sequence of the error sequence frame is determined according to the sampling point sequence number and the sampling point UTC time of the error sequence frame;
if the sampling point UTC time of the error sequence frame received by the protection device is before the sampling point UTC time of the D frame before the error sequence frame, the error sequence frame is considered invalid, and the data of the error sequence frame is discarded.
8. The method for synchronizing data of differential protection of 5G communication line according to claim 1, wherein when the number of the differential synchronization sampling point of the M-side protection device is greater than the number of the latest sampling point of the N-side protection device in the buffered data during the synchronization of the differential protection data, the differential protection is locked for a short time, a differential synchronization invalid flag is configured, and the data after fault-tolerant processing of the N-side protection device is reacquired and buffered, and the differential synchronization is performed again.
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