Relay protection information lossless forwarding method and system

Abstract

The invention discloses a relay protection information lossless forwarding method and system, and belongs to the technical field of transformer substation data transmission management. The system comprises an information transmission control module, a verification error correction module, an acquisition monitoring module, an intelligent analysis module, an intelligent calculation module, an intelligent control module and an interaction module. The information transmission control module is used for sending a data packet; the verification and error correction module is used for receiving a data packet and correcting an error symbol; the acquisition monitoring module is used for acquiring parameter data; the intelligent analysis module is used for establishing an information transmission quality analysis model based on historical data stored in the database; the intelligent calculation module is used for calculating the number of check symbols added to the next data packet and the number of information symbols of the data block after FEC coding; the intelligent control module is used for automatically adjusting the FEC code of the next data packet of the information protection substation; and the interaction module is used for providing a man-machine interaction platform.

Description

Technical Field

[0001] The present invention relates to the technical field of substation data transmission management, and in particular to a method and system for lossless forwarding of relay protection information. Background Art

[0002] In the construction process of smart substations, real-time and accurate transmission of information is crucial for the rapid response and handling of substation faults; however, the traditional relay protection information transmission method has the risk of information loss or damage, which seriously affects the accurate judgment and timely handling of faults; therefore, the lossless forwarding technology of relay protection information came into being. Lossless forwarding usually refers to the process of data transmission, with high-quality transmission media, advanced coding technology and precise synchronization mechanism to ensure the losslessness of the signal during the transmission process and ensure the integrity and accuracy of the original information.

[0003] In the process of lossless information forwarding, redundant encoding is performed at the data sending end through FEC coding, check symbols are added, additional redundant information is generated, and this redundant information is sent to the receiving end together with the original information. After receiving the data, the receiving end uses this redundant information to detect and correct errors, thereby achieving lossless information forwarding. However, in the prior art, due to signal interference caused by the failure of the Baoxin substation, it is difficult to adaptively adjust the FEC coding according to the error characteristics. The Baoxin substation cannot quickly and efficiently send the faulty data packet to the Baoxin main station, which increases the risk of safety accidents. Summary of the invention

[0004] The object of the present invention is to provide a method and system for lossless forwarding of relay protection information to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for lossless forwarding of relay protection information, the method comprising the following steps:

[0006] S10, when a device failure occurs at the Baoxin substation, the relay protection information transmitted from the Baoxin substation to the Baoxin main station is encapsulated by encapsulation technology to obtain the data packet required for transmission, the data packet is divided into data blocks, and check symbols are added to the data blocks through FEC encoding, and the data blocks are sent to the Baoxin main station; wherein, parameter data during the data packet transmission process between the Baoxin substation and the Baoxin main station is collected; the parameter data includes the number of information symbols in the data block after FEC encoding, the number of check symbols added, and the data packet transmission rate;

[0007] S20, the security master station decapsulates the received data packet and performs FEC decoding, detects and corrects the error bits in the data block symbol according to the redundant information in the check symbol, and determines the number of corrected error symbols;

[0008] S30, storing the collected parameter data and the number of corrected error symbols as historical data in a database, and establishing an information transmission quality analysis model based on the historical data stored in the database, fitting a relationship curve of the total number of symbols transmitted per unit time of a data block after FEC encoding on the information transmission quality during data block transmission;

[0009] S40, monitor the network performance of the Baoxin substation and the Baoxin main station to determine the current data packet transmission rate; the Baoxin main station sends the optimal sending interval of the next data packet to the Baoxin substation according to the current received data packet processing rate; calculate the number of check symbols added to the next data packet and the number of information symbols of the FEC-encoded data block according to the established information transmission quality analysis model, the minimum threshold of information transmission quality, the optimal sending interval of the next data packet, the size of the next data packet and the current data packet transmission rate;

[0010] S50. Automatically adjust the FEC encoding of the next data packet of the Baoxin substation according to the calculated number of check symbols added to the next data packet and the number of information symbols of the data block after FEC encoding, and repeat steps S10-S50 until the administrator controls the Baoxin substation to stop sending data packets.

[0011] A relay protection information lossless forwarding system, the system comprises an information transmission control module, a verification and error correction module, a collection and monitoring module, an intelligent analysis module, an intelligent calculation module, an intelligent control module and an interaction module;

[0012] The information transmission control module is used to encapsulate the relay protection information transmitted from the Baoxin substation to the Baoxin main station by using encapsulation technology when an equipment failure occurs in the Baoxin substation, obtain the data packet required for transmission, divide the data packet into data blocks, add check symbols to the data blocks through FEC encoding, and send them to the Baoxin main station;

[0013] The check and error correction module is used to unpack the received data packet at the security main station and perform FEC decoding, detect and correct the error bits in the data block symbol according to the redundant information in the check symbol, and determine the number of corrected error symbols;

[0014] The acquisition monitoring module is used to collect parameter data during the data packet transmission process between the Baoxin substation and the Baoxin main station; the parameter data includes the number of information symbols in the data block after FEC encoding, the number of added check symbols and the data packet transmission rate;

[0015] The intelligent analysis module is used to store the collected parameter data and the number of error symbols determined and corrected as historical data in a database, and to establish an information transmission quality analysis model based on the historical data stored in the database, and to fit the relationship curve of the total number of symbols transmitted per unit time of the data block after FEC encoding on the information transmission quality during the data block transmission process;

[0016] The intelligent computing module is used to monitor the network performance of the Baoxin substation and the Baoxin main station, and determine the current data packet transmission rate; the Baoxin main station sends the optimal sending interval duration of the next data packet to the Baoxin substation according to the currently received data packet processing rate; according to the established information transmission quality analysis model, the minimum threshold of information transmission quality, the optimal sending interval duration of the next data packet, the size of the next data packet and the current data packet transmission rate, calculate the number of check symbols added to the next data packet and the number of information symbols of the data block after FEC encoding;

[0017] The intelligent control module is used to automatically adjust the FEC coding of the next data packet of the trust-protecting substation according to the calculated number of check symbols added to the next data packet and the number of information symbols of the data block after FEC coding;

[0018] The interaction module is used to provide a human-computer interaction platform. When the manager sends a control instruction through the human-computer interaction platform, the Baoxin substation stops sending data packets. The human-computer interaction platform is used by the manager to control the Baoxin substation to stop sending data packets.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: by establishing an information transmission quality analysis model, the influence of FEC coding on data packet communication transmission is analyzed, and the transmission time required for the next data packet is predicted according to current conditions, the number of added check symbols and the number of information symbols of the data block after FEC coding are adaptively adjusted, thereby improving the stability of the FEC coding technology, and at the same time, the priority of the data packet is divided, so that the faulty data packet can be forwarded losslessly more quickly and efficiently, so that the system can process the fault information more quickly, and the risk of safety accidents is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the steps of a method for lossless forwarding of relay protection information of the present invention;

[0021] Figure 2 It is a structural schematic diagram of a relay protection information lossless forwarding system of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-2 , the present invention provides a technical solution:

[0024] See also Figure 1 In the first embodiment, a method for lossless forwarding of relay protection information is provided, the method comprising the following steps:

[0025] S10. When a device failure occurs at the Baoxin substation, encapsulation technology is used to encapsulate the relay protection information transmitted from the Baoxin substation to the Baoxin main station to obtain the data packet required for transmission, which is divided into data blocks. Check symbols are added to the data blocks through FEC encoding, and the data blocks are sent to the Baoxin main station; wherein, parameter data is collected during the data packet sending process between the Baoxin substation and the Baoxin main station; the parameter data includes the number of information symbols in the data block after FEC encoding, the number of added check symbols and the data packet transmission rate.

[0026] Furthermore, the data packets are divided into a primary data packet, a secondary data packet and a fault data packet; the primary data packet represents important relay protection information; the secondary data packet represents unimportant relay protection information; the fault data packet represents the relay protection information of the faulty equipment of the corresponding Baoxin substation; when an equipment failure occurs in the Baoxin substation, the faulty equipment is determined, and the primary data packet and the secondary data packet corresponding to the equipment are treated as fault data packets and transmitted with priority; wherein, when the primary data packet and the secondary data packet are transmitted, the primary data packet is transmitted with priority.

[0027] In this embodiment, the important relay protection information represents information that is crucial to the safe and stable operation of the power system of the Baoxin substation, including but not limited to the configuration and setting of the protection device, the equipment operating status and the protection action; the unimportant relay protection information represents information that has little impact on the safe and stable operation of the power system of the Baoxin substation, including but not limited to the system operation log and the equipment operating status analog quantity; the equipment of the Baoxin substation includes but is not limited to switches, optoelectronic converters and network storage; wherein, in the process of dividing the data packet into data blocks, the data blocks divided from the same data packet have the same size, that is, the number of information symbols in the data block after FEC encoding is the same.

[0028] S20, the security master station decapsulates the received data packet and performs FEC decoding, detects and corrects the error bits in the data block symbol according to the redundant information in the check symbol, and determines the number of corrected error symbols.

[0029] Further, when the trust-guaranteeing substation sends a data packet, it determines the number of information symbols X and the number of check symbols Y added to the data block after FEC encoding;

[0030] When the main station performs FEC decoding on the received data packet, it detects and corrects the error bits in the data block symbol according to the redundant information in the check symbol, and determines the number of corrected error symbols Z; wherein the error symbol indicates the symbol with error bits in the data packet transmission process; when the main station cannot correct the error symbol in the data block, it sends a signal to the substation to retransmit the data block.

[0031] It should be noted that the inability of the signal-protecting main station to correct the erroneous symbols in the data block means that it is impossible to correct all the erroneous bits in all the erroneous symbols in the data block according to the currently added check symbols; since the receiving end of the signal-protecting main station cannot correct the erroneous symbols of the received data block, that is, the transmission fails, the data block is retransmitted.

[0032] In this implementation, due to the design of the encoding rules, the number of information symbols corresponding to the data block size is usually fixed. By calculating in advance the number of information symbols of the data block to be divided into the next data packet before encoding and the number of check symbols to be added, a suitable encoding rule is selected so that the faulty data packet can be forwarded losslessly more quickly and efficiently. Redundant information is added to the data block through FEC encoding, and the main station uses the added redundant information to detect and correct erroneous symbols during the transmission process, thereby achieving lossless conversion of data packets and improving the reliability of the communication system.

[0033] It should be noted that at the sending end of the Baoxin substation, data packet encapsulation is completed before the data packet is transmitted, and FEC encoding is performed after the data packet encapsulation; at the receiving end of the Baoxin main station, FEC decoding is performed after the data packet is unpacked. These two processes occur sequentially, but they are independent of each other, so FEC decoding will not affect the message encapsulation process at the sending end; through FEC encoding, even if packet loss or bit errors occur during the transmission process, the data packet can be restored at the receiving end of the Baoxin main station without the need to re-acquire the lost data packet from the sending end of the Baoxin substation, thereby realizing lossless forwarding of relay protection information.

[0034] S30. The collected parameter data and the number of corrected error symbols are stored as historical data in a database, and based on the historical data stored in the database, an information transmission quality analysis model is established to fit a relationship curve of the total number of symbols transmitted per unit time of a data block after FEC encoding and the influence of the information transmission quality during the data block transmission process.

[0035] Specifically, the method steps are:

[0036] S301, analyzing the historical data stored in the database, determining a set P consisting of different data packet transmission rates, information symbol numbers, check symbol numbers, and error symbol numbers; wherein P = {P1, P2, ..., P n};P i =(V i ,X i ,Y i ,Z i );

[0037] Among them, P1, P2, ..., P n represents the data packet transmission rate, number of information symbols, number of check symbols and number of error symbols in different historical data analyzed respectively; P i represents the data packet transmission rate, number of information symbols, number of check symbols and number of error symbols in the i-th historical data analyzed; i = 1, 2, ..., n; n represents the amount of historical data analyzed; V i represents the data packet transmission rate in the i-th historical data analyzed; X i represents the number of information symbols in the i-th historical data analyzed; Y i represents the number of check symbols in the i-th historical data analyzed; Z i represents the number of error symbols in the i-th historical data analyzed;

[0038] S302: Establish an information transmission quality analysis model, and calculate the total number of symbols transmitted per unit time of the FEC-encoded data block. As an independent variable, the information transmission quality during data block transmission As the dependent variable, the relationship curve of the total number of symbols transmitted per unit time of the data block after FEC encoding and the impact of the information transmission quality during the data block transmission process is fitted:

[0039]

[0040] Where k1 and k2 are both constants; 0 <k1≤1;

[0041] S303, substituting different information symbol numbers, check symbol numbers and error symbol numbers corresponding to different data packet transmission rates into the relationship curve of step S302, training the information transmission quality analysis model, and determining the values ​​of k1 and k2 respectively.

[0042] It should be noted that k1 and k2 are variable factors that fit the total number of symbols of the data block after FEC coding on the information transmission quality during data block transmission; according to X, Y and V, the total number of symbols transmitted per unit time of the data block after FEC coding is determined. According to X and Z, determine the information transmission quality during data block transmission The larger the value, the more error symbols appear under the unit information symbol number, that is, the worse the information transmission quality is during data block transmission. By using the corresponding data packet transmission rate, number of information symbols, number of check symbols and number of error symbols in different historical data in the set P, V i As the V training parameter in the relationship curve; X i As the X training parameter in the relationship curve; Y i As the Y training parameter in the relationship curve; Z i is regarded as the Z training parameter in the relationship curve; the training parameters are divided into a training set and a validation set, and the training set is substituted into the relationship curve to obtain: Different fitting curves are determined according to the values ​​of k1 and k2. According to the least squares method, an optimal curve is found so that the sum of the vertical distances from the optimal curve to the points on the independent variables and dependent variables corresponding to these training parameters is minimized, so that the information transmission quality analysis model can predict the information transmission quality during the data block transmission process. The model performance is verified according to the validation set, the values ​​of k1 and k2 are adjusted to improve the accuracy of the prediction of the information transmission quality analysis model, and finally the values ​​of k1 and k2 are determined.

[0043] S40. Monitor the network performance of the Baoxin substation and the Baoxin main station to determine the current data packet transmission rate; the Baoxin main station sends the optimal sending interval duration of the next data packet to the Baoxin substation based on the currently received data packet processing rate; calculate the number of check symbols added to the next data packet and the number of information symbols in the data block after FEC encoding based on the established information transmission quality analysis model, the minimum threshold of information transmission quality, the optimal sending interval duration of the next data packet, the size of the next data packet and the current data packet transmission rate.

[0044] In this embodiment, after receiving the data packet, the Baoxin main station diagnoses the Baoxin substation fault according to the fault data in the data packet, exports the fault data recorded in the data packet, and predicts the fault data export time of the currently received data packet based on the current received data packet processing rate, i.e., the fault data export rate, and sends it to the Baoxin substation as the optimal sending interval duration of the next data packet; wherein the fault data includes but is not limited to equipment current and voltage.

[0045] Specifically, the method steps for calculating the number of check symbols added to the next data packet are:

[0046] S401, monitor the network performance of the Baoxin substation and the Baoxin main station to determine the data packet transmission rate V at the current time t t , and determine the size W of the next data packet at the current time t t ; Wherein, t represents the timestamp;

[0047] S402, the Baoxin substation receives the information sent by the Baoxin main station and obtains the optimal sending interval time T0 of the next data packet;

[0048] S403, according to the established information transmission quality analysis model, the minimum threshold of information transmission quality, the optimal sending interval of the next data packet, the size of the next data packet and the current data packet transmission rate, calculate the number of check symbols Y added to the next data packet next and the number of information symbols X in the data block after FEC encoding next , so that Y next and X next Satisfying the condition formula:

[0049]

[0050] Among them, T sum Indicates the predicted transmission time required for the next data packet; Indicates the size of each information symbol under the selected encoding rule; Indicates the size of each check symbol under the selected encoding rule; ΔT indicates the duration of the data block transmission interval; Indicates that the number of information symbols is X next The minimum threshold of information transmission quality corresponding to the time; T' represents the time interval with the shortest distance between the optimal sending interval and the next data packet.

[0051] In this implementation, The size of is determined by the selected FEC coding rule, which indicates the ratio of the maximum number of error symbols that can be corrected to the number of information symbols in the data block under the current FEC coding rule; for example, under the RS coding rule, in, Express Round down to the nearest integer.

[0052] It should be noted that W t , and The size unit is bit; V t The size unit is bit / s; through X next Select the appropriate encoding rule for the size and get the corresponding and Predict the transmission time required for the next data packet, and then use min|T sum -T0|Limit the calculation results and determine the final encoding rules.

[0053] S50. Automatically adjust the FEC encoding of the next data packet of the Baoxin substation according to the calculated number of check symbols added to the next data packet and the number of information symbols of the data block after FEC encoding, and repeat steps S10-S50 until the administrator controls the Baoxin substation to stop sending data packets.

[0054] Furthermore, a human-computer interaction platform is provided. When the manager sends a control instruction through the human-computer interaction platform, the Baoxin substation stops sending data packets. The human-computer interaction platform is used by the manager to control the Baoxin substation to stop sending data packets.

[0055] In this implementation, the selected FEC encoding rules include but are not limited to RS encoding and A-FEC encoding; according to the calculated Y next and X next The process of automatically adjusting the FEC coding of the next data packet of the Baoxin substation is as follows: at a certain moment, the Baoxin substation uses A-FEC coding to transmit the data packet. At this time, the signal interference caused by the failure of the Baoxin substation leads to poor network communication conditions. Under the A-FEC coding rules, it is difficult to meet The RS coding has a stronger error correction capability than the A-FEC coding. Therefore, the trust-protecting substation selects the RS coding for the FEC coding rule of the next data packet, and the calculated X next =239,Y next =16, the calculated T' reaches the minimum value, that is, the next data packet is transmitted through RS (255, 239) encoding; wherein, the number of information symbols in the encoded data block is 239, that is, the size of each data block divided into the data packet is 239 symbols, and 255 indicates that it contains 239 information symbols and 16 check symbols.

[0056] See also Figure 2, in this embodiment 2: a relay protection information lossless forwarding system is provided, the system includes an information transmission control module, a verification and error correction module, a collection and monitoring module, an intelligent analysis module, an intelligent calculation module, an intelligent control module and an interaction module;

[0057] The information transmission control module is used to encapsulate the relay protection information transmitted from the Baoxin substation to the Baoxin main station by using encapsulation technology when an equipment failure occurs in the Baoxin substation, obtain the data packet required for transmission, divide the data packet into data blocks, add check symbols to the data blocks through FEC encoding, and send them to the Baoxin main station;

[0058] The check and error correction module is used to unpack the received data packet at the security main station and perform FEC decoding, detect and correct the error bits in the data block symbol according to the redundant information in the check symbol, and determine the number of corrected error symbols;

[0059] The acquisition monitoring module is used to collect parameter data during the data packet transmission process between the Baoxin substation and the Baoxin main station; the parameter data includes the number of information symbols in the data block after FEC encoding, the number of added check symbols and the data packet transmission rate;

[0060] The intelligent analysis module is used to store the collected parameter data and the number of error symbols determined and corrected as historical data in a database, and to establish an information transmission quality analysis model based on the historical data stored in the database, and to fit the relationship curve of the total number of symbols transmitted per unit time of the data block after FEC encoding on the information transmission quality during the data block transmission process;

[0061] The intelligent computing module is used to monitor the network performance of the Baoxin substation and the Baoxin main station, and determine the current data packet transmission rate; the Baoxin main station sends the optimal sending interval duration of the next data packet to the Baoxin substation according to the currently received data packet processing rate; according to the established information transmission quality analysis model, the minimum threshold of information transmission quality, the optimal sending interval duration of the next data packet, the size of the next data packet and the current data packet transmission rate, calculate the number of check symbols added to the next data packet and the number of information symbols of the data block after FEC encoding;

[0062] The intelligent control module is used to automatically adjust the FEC coding of the next data packet of the trust-protecting substation according to the calculated number of check symbols added to the next data packet and the number of information symbols of the data block after FEC coding;

[0063] The interaction module is used to provide a human-computer interaction platform. When the manager sends a control instruction through the human-computer interaction platform, the Baoxin substation stops sending data packets. The human-computer interaction platform is used by the manager to control the Baoxin substation to stop sending data packets.

[0064] In this embodiment:

[0065] The data packet is encapsulated and FEC-encoded by the information transmission control module and then sent to the check and error correction module; the check and error correction module unpacks and FEC-decodes the received data packet and corrects the error symbols; the acquisition monitoring module collects parameter data during the data packet sending process between the Baoxin substation and the Baoxin main station, and sends the collected parameter data to the intelligent analysis module and the intelligent calculation module respectively; the intelligent analysis module fits the relationship curve of the total number of symbols of the data block after FEC encoding on the information transmission quality during the data block transmission process, and sends the fitting result to the intelligent calculation module; the intelligent calculation module calculates the number of check symbols added to the next data packet and the number of information symbols of the data block after FEC encoding, and sends the calculation result to the intelligent control module; the intelligent control module automatically adjusts the FEC coding of the next data packet of the Baoxin substation according to the calculated number of check symbols added to the next data packet and the number of information symbols of the data block after FEC encoding; wherein, when the management personnel sends a control instruction through the human-computer interaction platform, the interaction module sends an instruction to the information transmission control module to stop sending data packets.

[0066] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for lossless forwarding of relay protection information, characterized in that: The method comprises the following steps: S10, when a device failure occurs at the Baoxin substation, the relay protection information transmitted from the Baoxin substation to the Baoxin main station is encapsulated by encapsulation technology to obtain the data packet required for transmission, the data packet is divided into data blocks, and check symbols are added to the data blocks through FEC encoding, and the data blocks are sent to the Baoxin main station; wherein, parameter data during the data packet transmission process between the Baoxin substation and the Baoxin main station is collected; the parameter data includes the number of information symbols in the data block after FEC encoding, the number of check symbols added, and the data packet transmission rate; S20, the security master station decapsulates the received data packet and performs FEC decoding, detects and corrects the error bits in the data block symbol according to the redundant information in the check symbol, and determines the number of corrected error symbols; S30, storing the collected parameter data and the number of corrected error symbols as historical data in a database, and establishing an information transmission quality analysis model based on the historical data stored in the database, fitting a relationship curve of the total number of symbols transmitted per unit time of a data block after FEC encoding on the information transmission quality during data block transmission; S40, monitor the network performance of the Baoxin substation and the Baoxin main station to determine the current data packet transmission rate; the Baoxin main station sends the optimal sending interval of the next data packet to the Baoxin substation according to the current received data packet processing rate; calculate the number of check symbols added to the next data packet and the number of information symbols of the FEC-encoded data block according to the established information transmission quality analysis model, the minimum threshold of information transmission quality, the optimal sending interval of the next data packet, the size of the next data packet and the current data packet transmission rate; S50. Automatically adjust the FEC encoding of the next data packet of the Baoxin substation according to the calculated number of check symbols added to the next data packet and the number of information symbols of the data block after FEC encoding, and repeat steps S10-S50 until the administrator controls the Baoxin substation to stop sending data packets.

2. A method for lossless forwarding of relay protection information according to claim 1, characterized in that: The data packets are divided into a primary data packet, a secondary data packet and a fault data packet; the primary data packet represents important relay protection information; The secondary data packet represents unimportant relay protection information; the fault data packet represents the relay protection information of the faulty equipment of the corresponding security substation; When a device failure occurs in the Baoxin substation, the failed device is determined, and the primary data packet and secondary data packet corresponding to the device are treated as faulty data packets and transmitted with priority; among which, when the primary data packet and the secondary data packet are transmitted, the primary data packet is transmitted with priority.

3. A method for lossless forwarding of relay protection information according to claim 1, characterized in that: When the trust-guaranteeing substation sends a data packet, it determines the number of information symbols X and the number of check symbols Y added to the data block after FEC encoding; When the main station performs FEC decoding on the received data packet, it detects and corrects the error bits in the data block symbol according to the redundant information in the check symbol, and determines the number of corrected error symbols Z; wherein the error symbol indicates the symbol with error bits in the data packet transmission process; when the main station cannot correct the error symbol in the data block, it sends a signal to the substation to retransmit the data block.

4. A method for lossless forwarding of relay protection information according to claim 3, characterized in that: The method steps of step S30 are: S301, analyzing the historical data stored in the database, determining a set P consisting of different data packet transmission rates, information symbol numbers, check symbol numbers, and error symbol numbers; wherein P = {P1, P2, ..., P n };P i =(V i ,X i ,Y i ,Z i ); Among them, P1, P2, ..., P n represents the data packet transmission rate, number of information symbols, number of check symbols and number of error symbols in different historical data analyzed respectively; P i represents the data packet transmission rate, number of information symbols, number of check symbols and number of error symbols in the i-th historical data analyzed; i = 1, 2, ..., n; n represents the amount of historical data analyzed; V i represents the data packet transmission rate in the i-th historical data analyzed; X i represents the number of information symbols in the i-th historical data analyzed; Y i represents the number of check symbols in the i-th historical data analyzed; Z i represents the number of error symbols in the i-th historical data analyzed; S302: Establish an information transmission quality analysis model, and calculate the total number of symbols transmitted per unit time of the FEC-encoded data block. As an independent variable, the information transmission quality during data block transmission As the dependent variable, the relationship curve of the total number of symbols transmitted per unit time of the data block after FEC encoding and the impact of the information transmission quality during the data block transmission process is fitted: Where k1 and k2 are both constants; 0 <k1≤1; S303, substituting different information symbol numbers, check symbol numbers and error symbol numbers corresponding to different data packet transmission rates into the relationship curve of step S302, training the information transmission quality analysis model, and determining the values ​​of k1 and k2 respectively.

5. A method for lossless forwarding of relay protection information according to claim 4, characterized in that: The method steps for calculating the number of check symbols added to the next data packet in step S40 are: S401, monitor the network performance of the Baoxin substation and the Baoxin main station to determine the data packet transmission rate V at the current time t t , and determine the size W of the next data packet at the current time t t ; Wherein, t represents the timestamp; S402, the Baoxin substation receives information sent by the Baoxin main station and obtains the optimal sending interval time T0 of the next data packet; S403, according to the established information transmission quality analysis model, the minimum threshold of information transmission quality, the optimal sending interval of the next data packet, the size of the next data packet and the current data packet transmission rate, calculate the number of check symbols Y added to the next data packet next and the number of information symbols X in the data block after FEC encoding next , so that Y next and X next Satisfying the condition formula: Among them, T sum Indicates the predicted transmission time required for the next data packet; Indicates the size of each information symbol under the selected encoding rule; Indicates the size of each check symbol under the selected encoding rule; ΔT indicates the duration of the data block transmission interval; Indicates that the number of information symbols is X next The minimum threshold of information transmission quality corresponding to the time; T' represents the time interval with the shortest distance between the optimal sending interval and the next data packet.

6. A method for lossless forwarding of relay protection information according to claim 5, characterized in that: A human-computer interaction platform is provided. When the manager sends a control instruction through the human-computer interaction platform, the Baoxin substation stops sending data packets; the human-computer interaction platform is used by the manager to control the Baoxin substation to stop sending data packets.

7. A relay protection information lossless forwarding system, characterized by: The system includes an information transmission control module, a verification and error correction module, a collection and monitoring module, an intelligent analysis module, an intelligent calculation module, an intelligent control module and an interaction module; The information transmission control module is used to encapsulate the relay protection information transmitted from the Baoxin substation to the Baoxin main station by using encapsulation technology when an equipment failure occurs in the Baoxin substation, obtain the data packet required for transmission, divide the data packet into data blocks, add check symbols to the data blocks through FEC encoding, and send them to the Baoxin main station; The check and error correction module is used to unpack the received data packet at the security main station and perform FEC decoding, detect and correct the error bits in the data block symbol according to the redundant information in the check symbol, and determine the number of corrected error symbols; The acquisition monitoring module is used to collect parameter data during the data packet transmission process between the Baoxin substation and the Baoxin main station; The parameter data includes the number of information symbols, the number of added check symbols and the data packet transmission rate of the data block after FEC encoding; The intelligent analysis module is used to store the collected parameter data and the number of error symbols determined and corrected as historical data in a database, and to establish an information transmission quality analysis model based on the historical data stored in the database, and to fit the relationship curve of the total number of symbols transmitted per unit time of the data block after FEC encoding on the information transmission quality during the data block transmission process; The intelligent computing module is used to monitor the network performance of the Baoxin substation and the Baoxin main station and determine the current data packet transmission rate; the Baoxin main station sends the optimal sending interval duration of the next data packet to the Baoxin substation according to the current received data packet processing rate; According to the established information transmission quality analysis model, the minimum threshold of information transmission quality, the optimal sending interval of the next data packet, the size of the next data packet and the current data packet transmission rate, the number of check symbols added to the next data packet and the number of information symbols of the data block after FEC encoding are calculated; The intelligent control module is used to automatically adjust the FEC coding of the next data packet of the trust-protecting substation according to the calculated number of check symbols added to the next data packet and the number of information symbols of the data block after FEC coding; The interaction module is used to provide a human-computer interaction platform. When the manager sends a control instruction through the human-computer interaction platform, the Baoxin substation stops sending data packets. The human-computer interaction platform is used by the manager to control the Baoxin substation to stop sending data packets.

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