CN115190576B - Wireless differential synchronization system and method for self-adaptive cache depth - Google Patents
Wireless differential synchronization system and method for self-adaptive cache depth Download PDFInfo
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Abstract
The application discloses a wireless differential synchronization system and a method for self-adaptive buffer depth, belonging to the technical field of relay protection of power systems, wherein the system comprises the following steps: synchronous sampling and serial number synchronization of each sampling point are carried out with the contralateral line protection device; transmitting a data frame to the opposite side line protection device, and adding a synchronous sequence number and a time stamp; after receiving the data frame sent by the opposite side line protection device, storing the data frame in the data receiving buffer of the side by taking the synchronous sequence number in the received data frame as an identification; and respectively reading the data receiving buffer synchronous data of the local side and the data receiving synchronous data of the local side according to the synchronous sequence number at the current moment, and performing differential protection processing on each sampling point. The application optimizes the setting of the jitter elimination delay by monitoring the channel delay state in real time and dynamically adjusts the jitter elimination delay, so that the quick action of relay protection is ensured to the maximum extent on the premise of adapting to the characteristics of the wireless communication data channel, and important technical support is provided for the popularization of 5G differential protection service.
Description
Technical Field
The application relates to a wireless differential synchronization system and method for self-adaptive cache depth, and belongs to the technical field of relay protection of power systems.
Background
With the development of 5G communication technology and the improvement of transmission performance, the wireless communication technology is gradually applied to the longitudinal differential protection of line protection as a data transmission channel, and compared with the traditional optical fiber channel, the wireless communication technology has the advantages of low construction cost, flexible deployment, easy in-range dense coverage and the like. However, compared to fibre channel, the channel delay of wireless communication has some uncertainty and some jitter.
The pilot differential protection requires the line protection devices on two sides to transmit synchronous data in real time, and has high requirements on real-time property and synchronism of the transmitted data. Synchronous sampling and serial number synchronization of measurement data can be realized by means of an external clock or 5G network time service, and data synchronism is realized. In addition, the protection device also needs to process the real-time property of the transmission data, each frame of data transmission needs a certain transmission delay, the stable data delay is convenient for the protection algorithm to continuously perform phasor calculation of a certain data window, when a certain frame of delay shakes and fails to be received in time, the phasor of a subsequent data window cannot be calculated until the delay is stabilized again.
The conventional method is to add a jitter elimination delay, when the data reaches the local side, firstly perform buffering, extract the data from the buffer after the stable jitter elimination delay, and when the jitter degree of the delay is smaller than the jitter elimination delay, extract the data of the buffer in real time without causing data interruption. However, the problem is that no matter how large the jitter elimination delay is set, the channel data transmission delay cannot exceed the limit value due to the uncertainty of the wireless network; and the jitter elimination delay can directly influence the differential protection action time, and the larger the jitter elimination delay is, the larger the protection action time is, so that the quick action of relay protection is directly influenced.
Disclosure of Invention
The application aims to overcome the defects in the prior art, and provides a wireless differential synchronization system and a wireless differential synchronization method for self-adaptive buffer depth, which optimize the setting of jitter elimination delay by monitoring the channel delay state in real time and dynamically adjust the jitter elimination delay, so that the quick action of relay protection is ensured to the maximum extent on the premise of adapting to the characteristics of a wireless communication data channel, and an important technical support is provided for the popularization of 5G differential protection service.
In order to achieve the above purpose, the application is realized by adopting the following technical scheme:
in a first aspect, the present application provides a wireless differential synchronization method for adaptive buffer depth, including:
synchronous sampling and serial number synchronization of each sampling point are carried out with the contralateral line protection device;
transmitting a data frame to the opposite side line protection device, and adding a synchronous sequence number and a time stamp;
after receiving the data frame sent by the opposite side line protection device, storing the data frame in the data receiving buffer of the side by taking the synchronous sequence number in the received data frame as an identification;
and respectively reading the data receiving buffer synchronous data of the local side and the data receiving synchronous data of the local side according to the synchronous sequence number at the current moment, and performing differential protection processing on each sampling point.
Further, respectively reading the local side data receiving buffer synchronous data and the local side receiving synchronous data according to the synchronous sequence number at the current moment, and performing differential protection processing on each sampling point, including:
calculating the data receiving delay of each frame through the difference between the receiving time and the data frame sending time stamp;
counting the data receiving delay of each frame in one minute;
taking the set interval time as a grading standard, wherein the receiving delay of the statistical data frame is smaller than the duty ratio of each grade;
taking a minimum gear threshold value with the duty ratio larger than a specified proportion as jitter elimination delay;
additionally adding compensation delay according to different data receiving delay of each frame of data;
and finding a point of which the synchronous sequence number is calculated by differential protection in the self-side cache synchronous data, and carrying out differential protection calculation on the point of which the synchronous sequence number is calculated by differential protection and the data of which the synchronous sequence number is calculated by differential protection in the self-side cache synchronous data.
Further, the calculation formula for calculating the synchronization sequence number by differential protection is as follows:
s2=s1-T2 f1 in response to s1++t2×f1;
s2=s1+n1+1-T2 f1 in response to S1 < T2 f1;
wherein, S1 is the synchronization sequence number of the local sampling current point, T2 is the jitter elimination delay, f1 is the transmission frequency, S2 is the differential protection calculation synchronization sequence number, and N1 is the synchronization sequence number set value.
Further, after the data in the data receiving buffer is read, the synchronization serial number identifier corresponds to a mark position 0 to indicate that the data is extracted; when the data with the synchronous serial number is received again, the flag corresponding to the synchronous serial number identifier is set to 1, which indicates that the data is updated.
Further, when the current value marked as the differential protection calculation synchronization sequence number is read from the data receiving buffer, if the flag bit corresponding to the differential protection calculation synchronization sequence number is 1, the data is judged to be normal if the data is updated; if the flag bit is 0, it indicates that the data has not been updated, and it is determined as abnormal, and the differential protection is blocked for 5ms.
Further, the differential protection calculation is performed on the data with the synchronization sequence number of the local side receiving the synchronization data being the differential protection calculation synchronization sequence number, and the method comprises the following steps:
in response to t2now=t2last, synchronously calculating the number of push-back points; when T2now > T2last, after calculating the number of the push-back points again, calculating the differential protection of the synchronous serial number of the current point according to the new number of the push-back points to calculate the synchronous serial number, and locking the differential protection for a short time at the same time;
responding to T2now < (T2 last-5 ms), gradually reducing the differential protection calculation synchronization sequence number value every minute until the value is reduced to T2now, re-calculating the number of push-back points after each reduction, calculating the differential protection calculation synchronization sequence number of the current point according to the new number of push-back points, and locking differential protection for a short time;
wherein, T2now is the differential protection calculation synchronization sequence number at the current time, and T2last is the differential protection calculation synchronization sequence number of the previous minute.
Further, the step of taking the set interval time as a step standard comprises the following steps: from 15ms to 60ms, every 5ms interval is taken as a 1-gear threshold value, and the steps are as follows: 15ms, 20ms, 25ms, 30ms, 35ms, 40ms, 45ms, 50ms, 55ms, 60ms.
In a second aspect, the present application provides a wireless differential synchronization system with adaptive buffer depth, including a line protection device, where the line protection device includes:
and a synchronization module: the device is used for synchronizing sampling points and serial numbers with the contralateral line protection device;
and a sending module: for adding a synchronization sequence number and a time stamp to the data frame transmitted to the opposite line protection device;
and a receiving module: after receiving the data frame sent by the opposite side line protection device, storing the data frame in the data receiving buffer of the side by taking the synchronous sequence number in the received data frame as an identification;
differential protection calculation module: and the differential protection processing is carried out on each sampling point by respectively reading the data receiving buffer synchronous data of the local side and the data receiving synchronous data of the local side according to the synchronous sequence number of the current moment.
In a third aspect, the present application provides a wireless differential synchronization device with adaptive buffer depth, including a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is operative according to the instructions to perform the steps of the method according to any one of the preceding claims.
In a fourth aspect, the present application provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of any of the methods described above.
Compared with the prior art, the application has the beneficial effects that:
the application discloses a wireless differential synchronization system and a method for self-adaptive buffer depth, which are capable of adapting to the delay jitter characteristics of a wireless communication data channel to the greatest extent through a wireless differential protection logic, and reducing the action time of longitudinal differential protection to the greatest extent when the channel delay is jittered; the jitter elimination delay threshold is dynamically optimized in real time, namely, the corresponding push-back point value is adopted, so that the differential protection algorithm is suitable for the channel delay jitter characteristic, and meanwhile, the action time of differential protection is ensured. By adopting the method, the wireless differential protection can rapidly trip the outlet when in fault, timely remove the fault and ensure the safe and stable operation of the power grid.
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FIG. 1 is a schematic diagram of a scheme implementation logic provided in accordance with an embodiment of the present application;
fig. 2 is a schematic diagram of sampling data receiving, delay compensation, buffering and synchronization calculation according to an embodiment of the present application.
Detailed Description
The application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and are not intended to limit the scope of the present application.
Embodiment one:
the following is a preferred embodiment of the present application, comprising a wireless differential synchronization method employing an adaptive buffer depth of the present application, comprising the steps of:
the line protection devices at the two sides realize synchronous sampling and sequence number synchronization respectively through an external clock synchronization method, the synchronous sequence number and the time stamp are added to the transmitted data frame, the synchronous sequence number is an integer of 0-N1 cycles, the line protection devices at the two sides respectively transmit the data frame to the opposite side, and the transmission frequency is set to be f1 frames/second.
Step 2), the line protection device receives the opposite side data frames, stores the opposite side data frames in the local side data receiving buffer by taking the synchronous serial number as an identification, and calculates the data receiving delay T1 of each frame by the difference between the receiving time and the data frame sending time stamp.
Step 3) counting the receiving delay of each frame in one minute.
Step 4) taking 15ms to 60ms as 1-gear threshold values at intervals of 5ms, namely 15ms, 20ms, 25ms … … ms and 60ms, wherein the data frame receiving delay in one minute is smaller than the duty ratio of each gear, taking 15ms as an example, the duty ratio is the frame number with the receiving delay smaller than 15ms divided by the total transmission frame number in one minute.
Step 5), taking a minimum gear threshold value with the duty ratio being more than 99% as a jitter elimination delay T2, wherein the upper limit is 60ms; here the upper limit 60ms means: when the 60ms gear is still not satisfied, then T2 is taken to be 60ms.
Step 6) the side sampling data is sent to the side through a wireless channel, the distribution probability of the side real-time receiving data is uneven, and the compensation delay is additionally added according to different data receiving delays T1 of each frame of data, so that the total delay after compensation is the same and is an integer multiple of the sampling interval, namely the jitter elimination delay T2, and the large probability of the side receiving synchronous data after compensation is even.
Step 7), assuming that the synchronization sequence number of the local sampling current point is S1, taking p=t2×f1 as the synchronization calculation number of the pushback points, taking s2=s1-t2×f1 when S1 is greater than or equal to T2×f1, taking s2=s1+n1+1-t2×f1 when S1 is less than T2×f1, taking S2 as the differential protection calculation synchronization sequence number, and finding a point with the synchronization sequence number S2 in the local side cache synchronization data, so as to perform differential protection calculation with the data with the synchronization sequence number S2 of the local side cache synchronization data.
And 8) when each sampling point is calculated in the same way, respectively reading the local side cache synchronous data and the local side receiving synchronous data according to the synchronous sequence number at the current moment, and performing differential protection calculation.
Step 9) after the data in the data receiving buffer is read, the synchronous serial number identifier of the data corresponds to a flag position 0 to indicate that the data is extracted, and when the data with the synchronous serial number is received again, the flag corresponding to the synchronous serial number identifier is set to 1 to indicate that the data is updated.
Step 10) when the current value identified as S2 is read from the data receiving buffer, the flag bit corresponding to the normal condition S2 should be 1, which indicates that the data is updated, that is, the data is available, if the flag bit is 0, which indicates that the data is not updated, the data is determined to be abnormal, and the differential protection is locked for 20ms.
Step 11), counting each minute to obtain a T2 value, if the current time T2 value is T2now, and the last minute T2 value is T2last, if T2 now=T2last, then the channel state is the same as the last minute, the number P of the push-back points is calculated synchronously, if T2now > T2last, the number P of the push-back points is calculated again, the synchronous sequence number S2 of the current point S1 is calculated according to the new P value, and meanwhile differential protection is locked for a short time; when T2now < (T2 last-5 ms), the value of T2 is gradually reduced (the range is 5 ms) every minute until the value is reduced to T2now, the number of push-back points P is recalculated after the value of T2 is reduced every time, the synchronous sequence number S2 of the current point S1 is calculated according to the new value of P, and meanwhile differential protection is locked for a short time.
The application has been described herein in terms of certain exemplary embodiments. Appropriate substitutions and modifications will be apparent to those skilled in the art without departing from the scope of the application. The exemplary embodiments are merely illustrative and not limiting of the scope of the application, which is defined by the appended claims.
Embodiment two:
a wireless differential synchronization system with self-adaptive buffer depth can realize the wireless differential synchronization method with self-adaptive buffer depth according to the first embodiment, which comprises a line protection device, wherein the line protection device comprises:
and a synchronization module: the device is used for synchronizing sampling points and serial numbers with the contralateral line protection device;
and a sending module: for adding a synchronization sequence number and a time stamp to the data frame transmitted to the opposite line protection device;
and a receiving module: after receiving the data frame sent by the opposite side line protection device, storing the data frame in the data receiving buffer of the side by taking the synchronous sequence number in the received data frame as an identification;
differential protection calculation module: and the differential protection processing is carried out on each sampling point by respectively reading the data receiving buffer synchronous data of the local side and the data receiving synchronous data of the local side according to the synchronous sequence number of the current moment.
Embodiment III:
the embodiment of the application also provides a wireless differential synchronization device with self-adaptive cache depth, which can realize the wireless differential synchronization method with self-adaptive cache depth of the embodiment, and comprises a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate according to the instructions to perform the steps of the method of:
synchronous sampling and serial number synchronization of each sampling point are carried out with the contralateral line protection device;
transmitting a data frame to the opposite side line protection device, and adding a synchronous sequence number and a time stamp;
after receiving the data frame sent by the opposite side line protection device, storing the data frame in the data receiving buffer of the side by taking the synchronous sequence number in the received data frame as an identification;
and respectively reading the data receiving buffer synchronous data of the local side and the data receiving synchronous data of the local side according to the synchronous sequence number at the current moment, and performing differential protection processing on each sampling point.
Embodiment four:
the embodiment of the present application also provides a computer readable storage medium, which can implement the wireless differential synchronization method of adaptive buffer depth according to the embodiment, wherein a computer program is stored on the computer readable storage medium, and the program when executed by a processor implements the steps of the following method:
synchronous sampling and serial number synchronization of each sampling point are carried out with the contralateral line protection device;
transmitting a data frame to the opposite side line protection device, and adding a synchronous sequence number and a time stamp;
after receiving the data frame sent by the opposite side line protection device, storing the data frame in the data receiving buffer of the side by taking the synchronous sequence number in the received data frame as an identification;
and respectively reading the data receiving buffer synchronous data of the local side and the data receiving synchronous data of the local side according to the synchronous sequence number at the current moment, and performing differential protection processing on each sampling point.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present application, 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 application, and such modifications and variations should also be regarded as being within the scope of the application.
Claims (8)
1. A wireless differential synchronization method of self-adaptive buffer depth is characterized by comprising the following steps:
synchronous sampling and serial number synchronization of each sampling point are carried out with the contralateral line protection device;
transmitting a data frame to the opposite side line protection device, and adding a synchronous sequence number and a time stamp;
after receiving the data frame sent by the opposite side line protection device, storing the data frame in the data receiving buffer of the side by taking the synchronous sequence number in the received data frame as an identification;
respectively reading the data receiving buffer synchronous data of the local side and the data receiving synchronous data of the local side according to the synchronous sequence number of the current moment, and performing differential protection processing on each sampling point;
respectively reading the data receiving buffer synchronous data of the local side and the data receiving synchronous data of the local side according to the synchronous sequence number of the current moment, and performing differential protection processing on each sampling point, wherein the differential protection processing comprises the following steps:
calculating the data receiving delay of each frame through the difference between the receiving time and the data frame sending time stamp;
counting the data receiving delay of each frame in one minute;
taking the set interval time as a grading standard, wherein the receiving delay of the statistical data frame is smaller than the duty ratio of each grade;
taking a minimum gear threshold value with the duty ratio larger than a specified proportion as the jitter elimination delay, and calculating a differential protection calculation synchronization sequence number according to the jitter elimination delay;
additionally adding compensation delay according to different data receiving delay of each frame of data;
finding a point with the synchronous sequence number of differential protection calculation synchronous sequence number in the local side cache synchronous data, and carrying out differential protection calculation on the point with the synchronous sequence number of the local side cache synchronous data of the differential protection calculation synchronous sequence number;
the calculation formula of the differential protection calculation synchronization sequence number is as follows:
s2=s1-T2 f1 in response to s1++t2×f1;
s2=s1+n1+1-T2 f1 in response to S1 < T2 f1;
wherein, S1 is the synchronization sequence number of the local sampling current point, T2 is the jitter elimination delay, f1 is the transmission frequency, S2 is the differential protection calculation synchronization sequence number, and N1 is the synchronization sequence number set value.
2. The adaptive buffer depth wireless differential synchronization method according to claim 1, wherein after the data in the data receiving buffer is read, the synchronization sequence number identifier corresponds to a flag position 0, which indicates that the data has been extracted; when the data with the synchronous serial number is received again, the flag corresponding to the synchronous serial number identifier is set to 1, which indicates that the data is updated.
3. The method for wireless differential synchronization with adaptive buffer depth according to claim 2, wherein when the current value identified as the differential protection calculation synchronization sequence number is read from the data receiving buffer, if the flag bit corresponding to the differential protection calculation synchronization sequence number is 1, the data is judged to be normal if the data is updated; if the flag bit is 0, it indicates that the data has not been updated, and it is determined as abnormal, and the differential protection is blocked for 5ms.
4. The method for wireless differential synchronization with adaptive buffer depth according to claim 3, wherein finding a point with a synchronization sequence number of differential protection calculation synchronization sequence number in the local side buffer synchronization data, performing differential protection calculation with data with the synchronization sequence number of differential protection calculation synchronization sequence number of local side receiving synchronization data, comprises:
in response to t2now=t2last, synchronously calculating the number of push-back points; when T2now > T2last, after calculating the number of the push-back points again, calculating the differential protection of the synchronous serial number of the current point according to the new number of the push-back points to calculate the synchronous serial number, and locking the differential protection for a short time at the same time;
responding to T2now < (T2 last-5 ms), gradually reducing the differential protection calculation synchronization sequence number value every minute until the value is reduced to T2now, re-calculating the number of push-back points after each reduction, calculating the differential protection calculation synchronization sequence number of the current point according to the new number of push-back points, and locking differential protection for a short time;
wherein, T2now is the differential protection calculation synchronization sequence number at the current time, and T2last is the differential protection calculation synchronization sequence number of the previous minute.
5. The adaptive buffer depth wireless differential synchronization method of claim 1, wherein the step-by-step criteria is a set interval time, comprising: from 15ms to 60ms, every 5ms interval is taken as a 1-gear threshold value, and the steps are as follows: 15ms, 20ms, 25ms, 30ms, 35ms, 40ms, 45ms, 50ms, 55ms, 60ms.
6. The utility model provides a wireless differential synchronization system of self-adaptation buffer memory degree of depth which characterized in that includes line protection device, line protection device includes:
and a synchronization module: the device is used for synchronizing sampling points and serial numbers with the contralateral line protection device;
and a sending module: for adding a synchronization sequence number and a time stamp to the data frame transmitted to the opposite line protection device;
and a receiving module: after receiving the data frame sent by the opposite side line protection device, storing the data frame in the data receiving buffer of the side by taking the synchronous sequence number in the received data frame as an identification;
differential protection calculation module: the differential protection method comprises the steps of respectively reading local side data receiving cache synchronous data and local side receiving synchronous data according to a synchronous sequence number at the current moment, and performing differential protection processing on each sampling point;
respectively reading the data receiving buffer synchronous data of the local side and the data receiving synchronous data of the local side according to the synchronous sequence number of the current moment, and performing differential protection processing on each sampling point, wherein the differential protection processing comprises the following steps:
calculating the data receiving delay of each frame through the difference between the receiving time and the data frame sending time stamp;
counting the data receiving delay of each frame in one minute;
taking the set interval time as a grading standard, wherein the receiving delay of the statistical data frame is smaller than the duty ratio of each grade;
taking a minimum gear threshold value with the duty ratio larger than a specified proportion as the jitter elimination delay, and calculating a differential protection calculation synchronization sequence number according to the jitter elimination delay;
additionally adding compensation delay according to different data receiving delay of each frame of data;
finding a point with the synchronous sequence number of differential protection calculation synchronous sequence number in the local side cache synchronous data, and carrying out differential protection calculation on the point with the synchronous sequence number of the local side cache synchronous data of the differential protection calculation synchronous sequence number;
the calculation formula of the differential protection calculation synchronization sequence number is as follows:
s2=s1-T2 f1 in response to s1++t2×f1;
s2=s1+n1+1-T2 f1 in response to S1 < T2 f1;
wherein, S1 is the synchronization sequence number of the local sampling current point, T2 is the jitter elimination delay, f1 is the transmission frequency, S2 is the differential protection calculation synchronization sequence number, and N1 is the synchronization sequence number set value.
7. The wireless differential synchronization device with the self-adaptive cache depth is characterized by comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor being operative according to the instructions to perform the steps of the method according to any one of claims 1 to 5.
8. A computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor realizes the steps of the method according to any of claims 1 to 5.
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