Event time mark deviation correction method and system based on correlation signal time sequence matching

Abstract

The invention discloses an event time mark deviation correction method and system based on correlation signal time sequence matching, and the method comprises the steps: building a correlation relation between secondary equipment correlation signals SOE, and the SOE refers to event sequence records; obtaining all SOEs with association relationship in a set time period of the association signal, and calculating the signal width and interval width of each SOE; time sequence matching based on the SOE signal width and the interval width is carried out on the associated signals, and related SOEs with successful time sequence matching are determined; and according to the absolute time difference between the related SOEs, carrying out SOE time scale deviation correction on a clock abnormal signal of a current event in the related signals. The method can achieve the precise correction of the SOE time scale of the abnormal time synchronization equipment, improves the operation reliability of a transformer substation protection operation and maintenance system, and facilitates the improvement of the operation and maintenance level of a relay protection system.

Description

Technical Field

[0001] The invention belongs to the technical field of relay protection, and relates to a method and system for correcting event time-scale deviation based on correlation signal timing matching. Background Art

[0002] With the continuous development of substation protection operation and maintenance application technology, the operation and maintenance of relay protection has evolved from complete reliance on manual labor to comprehensive computer analysis of data from protection, monitoring, fault recording and other systems, realizing online inspection and intelligent scheduled inspection of protection equipment, which has significantly improved the efficiency and quality of protection operation and maintenance.

[0003] However, the normal operation of the protection and operation and maintenance system depends on the quality of data collection in each system, especially the accuracy of the time scale of various data. If the timing of a protection and control device is abnormal, the absolute time of the SOE and fault recording data sent by the device will be deviated. The analysis and diagnosis calculations such as equipment circuit diagnosis, power grid fault analysis, transient homology comparison, etc. based on the data of the wrong time reference are very likely to lead to wrong analysis results, which will confuse the operation and maintenance personnel and seriously affect the normal development of operation and maintenance work.

[0004] Therefore, it is necessary to study methods to identify and correct the time stamps of equipment with timing anomalies to ensure the normal operation of the substation protection operation and maintenance system, thereby improving the operation and maintenance level of relay protection equipment. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a method and system for correcting event time-stamp deviation based on associated signal timing matching, so as to avoid functional errors in the protection operation and maintenance system caused by abnormal time-stamp of data sent by protection control equipment.

[0006] The present invention adopts the following technical solution.

[0007] A first aspect of the present invention provides a method for correcting event timing deviation based on timing matching of associated signals, comprising:

[0008] S1: Establishing the association relationship between the secondary equipment association signals SOE, where SOE refers to the event sequence record;

[0009] S2: Obtain all associated SOEs within the associated signal setting time period and calculate the signal width and interval width of each SOE;

[0010] S3: performing timing matching on the associated signals based on the width of the SOE signal and the width of the interval, and determining the related SOEs with successful timing matching;

[0011] S4: According to the absolute time difference between the related SOEs, the SOE time deviation correction is performed on the clock abnormality signal of the current event in the associated signal.

[0012] Preferably, S1 includes:

[0013] Establish the correlation relationship between the signal input and output secondary device associated signal SOE based on the input and output loop relationship between the secondary devices;

[0014] Based on the same-source input relationship of the secondary devices, an association relationship between the associated signals SOE of the same-source input secondary devices is established.

[0015] Preferably, in S2, the signal width of the SOE is the absolute time difference between adjacent SOEs with a signal change of 0->1 and a SOE with a signal change of 1->0.

[0016] Preferably, in S2, the interval width of the SOE is the absolute time difference between adjacent signal 1->0 change SOEs and signal 0->1 change SOEs.

[0017] Preferably, in S3, for all SOEs with an associated relationship within the associated signal setting time period, if there are two or more consecutive pairs of associated SOEs that meet the following conditions, the associated signal timing matching is successful:

[0018] The difference in signal width of the associated SOE is smaller than the fixed threshold Tset1;

[0019] And the interval width difference of the associated SOE is smaller than the threshold Tset2.

[0020] Preferably, the fixed threshold Tset1 is 10 ms.

[0021] Preferably, the threshold Tset2 is:

[0022]

[0023] Where T1 and T2 are the interval widths between two SOEs in the associated SOE.

[0024] Preferably, in S4, the absolute time difference between the first pair of related SOEs is calculated, and if the difference is greater than a set threshold Tset, the SOE time scale deviation of the clock abnormality event signal in the associated signal is corrected by the difference.

[0025] A second aspect of the present invention provides an event timing deviation correction system based on correlation signal timing matching, comprising:

[0026] An association relationship building module is used to establish an association relationship between secondary equipment association signals SOE, where SOE refers to event sequence record;

[0027] A calculation module is used to obtain all associated SOEs within a set time period of the associated signal and calculate the signal width and interval width of each SOE;

[0028] A timing matching module is used to perform timing matching on the associated signals based on the width of the SOE signal and the width of the interval, and determine the related SOEs with successful timing matching;

[0029] The deviation correction module is used to correct the SOE time scale deviation of the clock abnormality signal of the current event in the associated signal according to the absolute time difference between the related SOEs.

[0030] A terminal includes a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the method.

[0031] A computer-readable storage medium stores a computer program, which implements the steps of the method when executed by a processor.

[0032] Compared with the prior art, the beneficial effects of the present invention include at least:

[0033] The present invention makes full use of the loop relationship between devices to establish the correlation between the SOEs of related devices, and realizes the accurate correction of the SOE time scale of the abnormal device according to the signal width and interval width matching of the SOE, thereby improving the operational reliability of the substation protection operation and maintenance system, and is conducive to improving the operation and maintenance level of the relay protection system.

[0034] When the present invention performs timing matching on the associated signal based on the SOE signal width and the interval width, the threshold Tset2 is adaptively adjusted according to the two related interval widths, which can effectively improve the timing matching accuracy of the associated signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flowchart of the method for correcting the event time-scale deviation of the present invention;

[0036] Figure 2 It is a schematic diagram of SOE signal width and interval width;

[0037] Figure 3 It is a schematic diagram of the association relationship between the secondary equipment association signals SOE;

[0038] Figure 4 It is a schematic diagram of the correction of abnormal signal SOE time scale deviation. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0040] Embodiment 1 of the present invention provides a method for correcting event timing deviation based on timing matching of associated signals, such as Figure 1 As shown, including:

[0041] S1: Establishing the association relationship between the secondary equipment association signals SOE, where SOE refers to the event sequence record;

[0042] Further preferably, a SOE association relationship of related device event sequence records is established according to the secondary loop relationship between devices, including:

[0043] Establish the association relationship between signal input and output secondary equipment SOE based on the input and output loop relationship between secondary equipment;

[0044] Based on the homologous input relationship of the secondary devices, an association relationship between the secondary devices SOEs with the same signal input is established.

[0045] Taking the line protection tripping and bus protection failure as an example, the line protection tripping signal and the bus protection receiving start failure signal are signal subscription relationships, such as Figure 3 As shown, the upper and lower rows represent two related signals (trip signal, start failure signal), and each dashed / solid line in each row is counted as one SOE, such as S1-A and T1-A are one SOE respectively.

[0046] S2: Obtain all associated SOEs within the associated signal setting time period and calculate the signal width and interval width of each SOE;

[0047] Further preferably, all associated SOEs within a time period are obtained, and the signal width and interval width of each SOE are analyzed;

[0048] The signal width of SOE is the absolute time difference between a certain signal 0->1 change SOE and the adjacent same signal 1->0 change SOE;

[0049] The width of the SOE interval is the absolute time difference between a certain signal 1->0 change SOE and the adjacent 0->1 change SOE of the same signal;

[0050] like Figure 3As shown in the figure, the signal width of SOE is the absolute time difference between the adjacent signal 0->1 shift SOE and the same signal 1->0 shift SOE; the SOE interval width is the absolute time difference between the adjacent signal 1->0 shift SOE and the same signal 0->1 shift SOE, specifically:

[0051] The signal width 1 of the line protection tripping signal is 100ms, the interval width 1 is 1.003s, the signal width 2 is 60ms, the interval width 2 is 8963234s, and the signal width 3 is 85ms;

[0052] The signal width 1 of the busbar protection receiving start failure signal is 81ms, the interval width 1 is 65432s, the signal width 2 is 104ms, the interval width 2 is 1.013s, the signal width 3 is 61ms, the interval width 3 is 8962898s, and the signal width 4 is 82ms.

[0053] S3: performing timing matching on the associated signals based on the width of the SOE signal and the width of the interval, and determining the related SOEs with successful timing matching;

[0054] Further preferably, searching for associated signal SOEs with matching signal widths and interval widths and aligning the related SOEs;

[0055] Signal width and interval width matching means that the signal width and interval width of the associated signal SOE are consistent when the signal width and interval width are changed for multiple times in a row, and the related SOEs are aligned according to the signal width and interval width matching principle.

[0056] Searching for the associated signal SOE with matching signal width and interval width and aligning the related SOE means:

[0057] Match the associated signal SOE within a time period so that the difference in signal width for two or more consecutive times is less than the set fixed threshold Tset1 (10ms), and the difference in interval width is less than the threshold Tset2.

[0058] In specific implementation, considering that the interval width may reach the level of years and months, for an asynchronous system, such a long time may make the cumulative error very large, so the present invention does not use a fixed threshold, but adaptively adjusts the threshold Tset2 according to the two related interval widths to improve the accuracy of the timing matching of the associated signal, as follows:

[0059] Where T interval is the interval width,

[0060] Perform matching search based on line protection tripping signal:

[0061] 1) The line protection tripping signal width 1 is 100ms, and the bus protection receiving start failure signal width 1 is 81ms. The difference between the two is 19ms, which is greater than the fixed threshold Tset1 (10ms), and the matching fails;

[0062] 2) The line protection tripping signal width 1 is 100ms, and the busbar protection signal width 2 is 104ms. The difference between the two is 4ms, which is less than the fixed threshold Tset1 (10ms);

[0063] The line protection interval width 1 is 1.003s, and the busbar protection interval width 2 is 1.013s. The difference between the two is 10ms, which is less than

[0064] 3) The line protection signal width 2 is 60ms, and the corresponding interval width 3 of the busbar protection is 61ms. The difference between the two is 1ms, which is less than the fixed threshold Tset1 (10ms);

[0065] The line protection interval width 2 is 8963234s, and the busbar protection interval width 3 is 8962898s. The difference between the two is 336s, which is less than

[0066] 4) The line protection signal width 3 is 85ms, and the corresponding interval width 4 of the busbar protection is 82ms. The difference between the two is 3ms, which is less than the fixed threshold Tset1 (10ms);

[0067] 5) It can be seen that the difference in signal width of three consecutive changes is less than the set threshold Tset1 (10ms), and the difference in the width of two intervals is less than The signal timing is matched successfully.

[0068] S4: According to the absolute time difference between the related SOEs, the SOE time deviation correction is performed on the clock abnormality signal of the current event in the associated signal.

[0069] Further preferably, based on the above signal timing matching, the SOE time stamp of the clock abnormal device is corrected according to the absolute time difference between the related SOEs after alignment at the same time:

[0070] When the absolute time difference between related SOEs at the same time is greater than the set threshold Tset, the event deviation is recorded and the corresponding SOE time stamp of the clock abnormal device is corrected. The threshold here is used to define under what circumstances the time stamp correction is triggered. It can be set as a fixed threshold. For example, Tset = 10ms can ensure that all time stamp errors above 10ms are corrected. In specific implementation, the threshold value can be set according to actual needs.

[0071] 1) Figure 4The time when the first action tripping signal of the middle line protection changes from 0->1 is 2023-1-1013:20:05.123, and the corresponding time when the busbar protection receives the start failure signal changes from 0->1 is 2023-1-105:10:33.369. The time difference ΔT1 between the two is 8:09:31.754. The time scale of the busbar protection receiving the start failure signal in this power grid accident is corrected according to ΔT1, as shown in Table 1:

[0072] Table 1

[0073]

[0074] 2) Figure 4 The third action trip pulse of the middle line protection is several months apart, which is another power grid accident. The third action trip signal 0->1 change time is 2023-04-24 07:07:19.371, and the corresponding busbar protection receiving start failure signal 0->1 change time is 2023-04-23 22:52:12.67. The time difference ΔT2 between the two is 8:15:06.701. The time scale of the busbar protection receiving start failure signal in this power grid accident is corrected according to ΔT2, as shown in Table 2:

[0075] Table 2

[0076]

[0077] It can be seen that in the two power grid accidents, the time stamp of the corrected busbar protection receiving start failure signal is basically consistent with the line protection signal change time, and the signal timing analysis can be carried out normally on this basis.

[0078] Embodiment 2 of the present invention provides an event time-scale deviation correction system based on correlation signal timing matching, including:

[0079] An association relationship building module is used to establish an association relationship between secondary equipment association signals SOE, where SOE refers to event sequence record;

[0080] A calculation module is used to obtain all associated SOEs within a set time period of the associated signal and calculate the signal width and interval width of each SOE;

[0081] A timing matching module is used to perform timing matching on the associated signals based on the width of the SOE signal and the width of the interval, and determine the related SOEs with successful timing matching;

[0082] The deviation correction module is used to correct the SOE time scale deviation of the clock abnormality signal of the current event in the associated signal according to the absolute time difference between the related SOEs.

[0083] Embodiment 3 of the present invention provides a terminal, including a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the method.

[0084] Embodiment 4 of the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the method when executed by a processor.

[0085] Compared with the prior art, the beneficial effects of the present invention include at least:

[0086] The present invention makes full use of the loop relationship between devices to establish the correlation between the SOEs of related devices, and realizes the accurate correction of the SOE time scale of the abnormal device according to the signal width and interval width matching of the SOE, thereby improving the operational reliability of the substation protection operation and maintenance system, and is conducive to improving the operation and maintenance level of the relay protection system.

[0087] When the present invention performs timing matching on the associated signal based on the SOE signal width and the interval width, the threshold Tset2 is adaptively adjusted according to the two related interval widths, which can effectively improve the timing matching accuracy of the associated signal.

[0088] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0089] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0090] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0091] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for correcting event time-scale deviation based on timing matching of associated signals, characterized in that: include: S1: Establishing the association relationship between the secondary equipment association signals SOE, where SOE refers to the event sequence record; S2: Obtain all associated SOEs within the associated signal setting time period and calculate the signal width and interval width of each SOE; S3: performing timing matching on the associated signals based on the width of the SOE signal and the width of the interval, and determining the related SOEs with successful timing matching; S4: According to the absolute time difference between the related SOEs, the SOE time deviation correction is performed on the clock abnormality signal of the current event in the associated signal.

2. The method for correcting event time-scale deviation based on timing matching of associated signals according to claim 1, characterized in that: S1 includes: Establish the correlation relationship between the signal input and output secondary device associated signal SOE based on the input and output loop relationship between the secondary devices; Based on the same-source input relationship of the secondary devices, an association relationship between the associated signals SOE of the same-source input secondary devices is established.

3. The method for correcting event time-scale deviation based on timing matching of associated signals according to claim 1, characterized in that: In S2, the signal width of the SOE is the absolute time difference between the adjacent signal 0->1 change SOE and the signal 1->0 change SOE.

4. The method for correcting event timing deviation based on timing matching of associated signals according to claim 1, characterized in that: In S2, the interval width of the SOE is the absolute time difference between the adjacent signal 1->0 change SOE and the signal 0->1 change SOE.

5. The method for correcting event time-scale deviation based on timing matching of associated signals according to claim 1, characterized in that: In S3, for all SOEs with association relationships within the association signal setting time period, if there are two or more consecutive pairs of associated SOEs that meet the following conditions, the association signal timing matching is successful: The difference in signal width of the associated SOE is smaller than the fixed threshold Tset1; And the interval width difference of the associated SOE is smaller than the threshold Tset2.

6. The method for correcting event time-scale deviation based on timing matching of associated signals according to claim 5, characterized in that: The fixed threshold Tset1 is 10 ms.

7. The method for correcting event time-scale deviation based on timing matching of associated signals according to claim 5, characterized in that: The threshold Tset2 is: Where T1 and T2 are the interval widths between two SOEs in the associated SOE.

8. The method for correcting event time-scale deviation based on timing matching of associated signals according to claim 1, characterized in that: In S4, the absolute time difference between the first pair of related SOEs is calculated. If the difference is greater than a set threshold Tset, the SOE time scale deviation of the clock abnormality event signal in the associated signal is corrected by the difference.

9. An event time-scale deviation correction system based on correlation signal timing matching, using the method according to any one of claims 1 to 8, characterized in that: The system comprises: An association relationship building module is used to establish an association relationship between secondary equipment association signals SOE, where SOE refers to event sequence record; A calculation module is used to obtain all associated SOEs within a set time period of the associated signal and calculate the signal width and interval width of each SOE; A timing matching module is used to perform timing matching on the associated signals based on the width of the SOE signal and the width of the interval, and determine the related SOEs with successful timing matching; The deviation correction module is used to correct the SOE time scale deviation of the clock abnormality signal of the current event in the associated signal according to the absolute time difference between the related SOEs.

10. A terminal comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1-8.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

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