An automatic alignment method for substation waveform recording files

Abstract

This invention discloses an automatic alignment method for substation waveform recording files, relating to the field of substations. The method includes: acquiring protection device waveform files and fault waveform files, and performing sampling frequency unification processing; acquiring the fault point times of the protection device waveform files and fault waveform files after sampling frequency unification processing, dividing the data into calculation intervals, generating a protection device waveform data set and a fault waveform file data set after calculation interval calibration, further calculating the effective value sequence, and extracting the maximum value sequence from it; and using a channel matching and time axis synchronization algorithm, performing feature matching on the maximum value sequence of the protection device waveform files after sampling frequency unification processing and the fault waveform files after calculation interval calibration to achieve time axis alignment. This method solves the problems of data channels and data points not being directly aligned, and the high algorithm complexity and excessive system resource consumption of existing alignment methods.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of transformer substations, and in particular to a method for automatically aligning recording files of a transformer substation. BACKGROUND

[0002] In the operation monitoring and fault analysis of a transformer substation, in order to accurately evaluate the operation state of a power grid and the root cause of a fault, it is usually necessary to synchronize the recording files of different devices to a unified time dimension to achieve data alignment. At present, when a protection device and a fault recording device of a transformer substation detect a fault in a power grid, they will trigger a recording function and generate a fault recording file. A conventional time alignment method relies on a time synchronization device to ensure that all devices are time-synchronized, and then waveform data is extracted from the same time period of different files, and in theory these data should be consistent.

[0003] However, when the time stamps of devices are inconsistent due to time synchronization deviation or time synchronization abnormality, the time stamps of the recording files will deviate, and the conventional time alignment method is no longer applicable. To solve the problem of aligning recording files under non-synchronized time stamps, some manufacturers have proposed solutions based on algorithms, but these methods usually involve complex fast Fourier transform (FFT) calculations, have high algorithm complexity and low alignment success rate. Therefore, there is an urgent need to provide a method for automatically aligning recording files of a transformer substation to solve problems such as time synchronization error, device heterogeneity, and channel correspondence. SUMMARY

[0004] The present application provides a method for automatically aligning recording files of a transformer substation to solve the problem that, in the case of errors or abnormalities in a time synchronization device, the time stamps of recording files of protection devices and fault recording devices produced by different manufacturers are inconsistent, resulting in that data channels and data points cannot be directly aligned, affecting fault analysis under a unified clock; the problem that devices produced by different manufacturers differ in fault calculation algorithms and the sensitivity of starting elements, affecting data consistency and analysis accuracy; the problem that there is a lack of clear correlation between channels and data of different devices, resulting in inaccurate alignment; and the problem that existing alignment methods involve a large amount of calculation, such as fast Fourier transform, resulting in high algorithm complexity and high occupation of system resources.

[0005] The present application provides a method for automatically aligning recording files of a transformer substation, comprising the following steps:

[0006] S1, obtaining a protection device recording file and a fault recording file, and performing sampling frequency unification processing on the protection device recording file and the fault recording file to obtain a protection device recording file and a fault recording file that have undergone sampling frequency unification processing;

[0007] S2, obtain fault point time of the protection device recording file and the fault recording file after the sampling frequency unification processing, and divide the calculation interval to generate the protection device recording data set and the fault recording data set; calibrate the fault recording file after the sampling frequency unification processing based on the calculation interval to generate the fault recording file data set after the calculation interval calibration;

[0008] S3, calculate the effective value sequence based on the protection device recording data set and the fault recording data set after the calculation interval calibration, and extract the maximum value sequence therefrom;

[0009] S4, through the channel matching and time axis synchronization algorithm, perform feature matching on the maximum value sequence of the protection device recording file after the sampling frequency unification processing and the maximum value sequence of the fault recording file after the calculation interval calibration, and calculate the time offset to complete the time axis alignment of the protection device recording file after the sampling frequency unification processing and the fault recording file after the calculation interval calibration.

[0010] Preferably, the S1 specifically comprises:

[0011] The protection device recording file and the fault recording file after the sampling frequency unification processing respectively contain the data set of the protection device recording file after the sampling frequency unification processing and the data set of the fault recording file after the sampling frequency unification processing.

[0012] Preferably, the S2 specifically comprises:

[0013] Taking the fault point time of the protection device recording file and the fault recording file after the sampling frequency unification processing as the reference, the calculation interval is divided from the protection device recording file and the fault recording file after the sampling frequency unification processing respectively in combination with the sampling period.

[0014] Preferably, the S2 specifically comprises:

[0015] Based on the starting point of the calculation interval of the protection device recording file after the sampling frequency unification processing and the starting point of the calculation interval of the fault recording file after the sampling frequency unification processing, the starting time difference is calculated; based on the starting time difference, the fault recording data set after the calculation interval calibration is generated.

[0016] Preferably, the S3 specifically comprises:

[0017] The protection device recording data set and the fault recording data set after the calculation interval calibration respectively contain sampling data of The sampling data of each channel is converted into frequency domain components based on time domain data; and the effective value of the sampling data of each channel in the calculation interval is calculated based on the modulus square sum of the frequency domain components, so as to obtain the effective value sequence of each channel of the protection device recording file after the sampling frequency uniform processing and the fault recording file after the calculation interval calibration.

[0018] Preferably, the S3 specifically comprises:

[0019] The effective value sequence of each channel of the protection device recording file after the sampling frequency uniform processing and the effective value sequence of each channel of the fault recording file after the calculation interval calibration are sorted in descending order respectively, and the first maximum effective value and the corresponding time stamp are extracted to generate the maximum value sequence of each channel of the protection device recording file after the sampling frequency uniform processing and the maximum value sequence of each channel of the fault recording file after the calculation interval calibration.

[0020] Preferably, the S4 specifically comprises:

[0021] In the implementation process of the channel matching and time axis synchronization algorithm, the maximum value sequence of each channel of the protection device recording file after the sampling frequency uniform processing is taken as a reference to find the matching channel in the maximum value sequence of all channels of the fault recording file after the calculation interval calibration.

[0022] Preferably, the S4 specifically comprises:

[0023] The matching conditions include value consistency, time difference consistency and channel attribute consistency; if the channel of the fault recording file after the calculation interval calibration that meets the matching conditions is found, the channel of the protection device recording file after the sampling frequency uniform processing and the channel of the fault recording file after the calculation interval calibration are considered as the same channel.

[0024] Preferably, the S4 specifically comprises:

[0025] The time offset is calculated based on the first matching point time stamp in the matching channel, including the first maximum effective value time stamp of the channel of the protection device recording file after the sampling frequency uniform processing and the first maximum effective value time stamp of the channel of the fault recording file after the calculation interval calibration.

[0026] The technical scheme of the present application has the following beneficial effects:

[0027] 1. Sampling frequency checking and standardization ensured data consistency in waveform recording files from different devices, laying the foundation for subsequent processing; by calculating the fault occurrence time and correcting the time offset, the impact of time synchronization errors was eliminated; channel matching and time axis synchronization ensured precise correspondence of data points on the time axis. The implementation of an automatic alignment method for substation waveform recording files enables substation fault analysis to accurately align waveform recording files from different devices even when time synchronization devices fail or clock domains are inconsistent, thereby improving the reliability and accuracy of fault analysis and enhancing the robustness of power system operation monitoring.

[0028] 2. The feature extraction method based on the maximum value sequence overcomes the impact of differences in fault calculation algorithms and starting element sensitivity between different manufacturers' equipment on the timestamps and data start points of waveform recording files. By extracting significant features of electrical quantities near the fault point, such as the maximum effective value of voltage or current mutations, a physically representative feature sequence is generated. This sequence maintains high consistency across different devices, thus avoiding trigger time deviations and data inconsistencies caused by differences in algorithms or starting elements. This ensures the universality of waveform recording file alignment, is applicable to equipment from multiple manufacturers, and improves the compatibility and efficiency of multi-device collaborative analysis in power systems.

[0029] 3. Based on the maximum value sequence, the channel corresponding to the protection device waveform file and the fault waveform file is automatically identified, eliminating the tedious manual channel mapping process in traditional methods. Channel matching utilizes multi-dimensional constraints (value consistency, time difference consistency, and channel attribute consistency) to ensure the accuracy and uniqueness of the matching, significantly reducing manual intervention, improving the automation and efficiency of channel identification, reducing the risk of configuration errors, thereby optimizing the substation fault analysis process and enhancing the operational convenience of power system data processing.

[0030] 4. A feature extraction method based on the maximum value sequence is adopted, extracting only a limited number of maximum effective values ​​and their timestamps, rather than the complex full-text waveform fast Fourier transform analysis in traditional methods, which significantly reduces the amount of computation. The application of fast Fourier transform and fast sorting algorithms further improves the efficiency of feature extraction and sorting. In addition, boundary calibration and time axis synchronization reduce unnecessary computational overhead by limiting the time offset range and using simple timestamp calibration, resulting in low computational resource consumption, fast search speed, and high alignment success rate in the waveform file alignment process, which can meet the performance requirements of real-time fault analysis in substations, thereby improving the real-time performance and efficiency of power system operation monitoring. Attached Figure Description

[0031] Figure 1 This is a flowchart of an automatic alignment method for substation waveform recording files according to the present invention. Detailed Implementation

[0032] In order to make the technical means and effects taken by the present application to achieve the predetermined object of the application more clear and to make the present application more comprehensible, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0034] The specific scheme of the automatic alignment method for the substation recording file provided by the present application will be described below in detail with reference to the drawings.

[0035] Referring to the drawings Figure 1 , it shows a flow chart of the automatic alignment method for the substation recording file provided by an embodiment of the present application, which comprises the following steps:

[0036] S1, obtaining the protection device recording file and the fault recording file, and performing sampling frequency uniform processing on the protection device recording file and the fault recording file to obtain the protection device recording file and the fault recording file after sampling frequency uniform processing.

[0037] When the power grid fails, such as short circuit or grounding, the recording function of the protection device and the fault recording device will be triggered, the protection device generates the protection device recording file , and the fault recording device generates the fault recording file ; the protection device recording file and the fault recording file include header files, configuration files, data files and information files, etc.

[0038] Since the protection device and the fault recording device may use different sampling frequencies, direct processing will cause the data points on the time axis not to correspond, therefore, the protection device recording file and the fault recording file are subjected to sampling frequency uniform processing, specifically: by checking the sampling frequencies of the protection device recording file and the fault recording file , it is determined whether interpolation processing is needed, specifically: the sampling frequencies are extracted from the header files of the protection device recording file and the fault recording file , and are denoted as the sampling frequency of the protection device and the sampling frequency of the fault recording device , respectively, if , the sampling frequencies are consistent, and no interpolation processing is needed, and the protection device recording file and the fault recording file after the sampling frequency unification processing are the protection device recording file and the fault recording file . ; if , interpolation processing is needed to unify the sampling frequencies, and the interpolation processing can select Lagrange interpolation or spline interpolation, which are both well-known technical means to those skilled in the art, and will not be described here. The protection device recording file and the fault recording file after the sampling frequency unification processing respectively include the data set of the protection device recording file after the sampling frequency unification processing and the data set of the fault recording file after the sampling frequency unification processing , and the sampling period , wherein represents the sampling data of the protection device recording file after the sampling frequency unification processing at time ; and represents the sampling data of the fault recording file after the sampling frequency unification processing at time ; and represents the unified sampling frequency.

[0039] S2, obtaining the fault point time of the protection device recording file and the fault recording file after the sampling frequency unification processing, and dividing the calculation interval to generate the protection device recording data set and the fault recording data set; based on the calculation interval, calibrating the fault recording file after the sampling frequency unification processing to generate the fault recording file data set after the calculation interval calibration.

[0040] The fault point time is read from the header file or the trigger record of the protection device recording file and the fault recording file after the sampling frequency unification processing, including the fault point time of the protection device recording file after the sampling frequency unification processing and the fault point time of the fault recording file after the sampling frequency unification processing .

[0041] Taking the fault point time of the protection device recording file after the sampling frequency unification processing and the fault point time of the fault recording file after the sampling frequency unification processing as the reference, the sampling period is combined., respectively, from the protection device recording file and the fault recording file after the sampling frequency unification processing, and the calculation interval is centered on the fault point time, covering a time window of 4 sampling periods, 2 sampling periods before the fault and 2 sampling periods after the fault.

[0042] For the protection device recording file after the sampling frequency unification processing, the calculation interval is defined as , and a protection device recording data set is generated, containing all sampling data in the calculation interval; for the fault recording file after the sampling frequency unification processing, the calculation interval is defined as , and a fault recording data set is generated.

[0043] The starting point of the calculation interval of the protection device recording file after the sampling frequency unification processing is taken , and the starting point of the calculation interval of the fault recording file after the sampling frequency unification processing is taken , the starting time difference between the protection device recording file and the fault recording file after the sampling frequency unification processing is calculated , and the formula is expressed as:

[0044] ,

[0045] If and , it indicates that there is a correctable small time error, and the calculation interval of the fault recording file after the sampling frequency unification processing needs to be shifted by :

[0046] ,

[0047] wherein, is the fault recording data set after the calculation interval calibration; represents the sampling data of the fault recording file after the sampling frequency unification processing at time , that is, the sampling data of the fault recording file after the calculation interval calibration at time .

[0048] If , it indicates that the time shift is too large, which may be equipment failure or data anomaly, and an alarm is needed and the alignment process is terminated.

[0049] S3, based on the protection device recording data set and the fault recording data set after the calculation interval calibration, the effective value sequence is calculated, and the maximum value sequence is extracted therefrom.

[0050] Based on the protection device waveform data set and the fault waveform data set after calculation interval calibration, a fast Fourier transform is performed on the sampling data of each channel of the protection device waveform file after unified sampling frequency processing and the sampling data of each channel of the fault waveform file after calculation interval calibration. The effective value sequence is calculated and the maximum value sequence is extracted from it for subsequent channel matching and time axis synchronization.

[0051] The protection device waveform data set and the fault waveform data set after calculation interval calibration respectively contain Sampling data from each channel and The sampling data of each channel records the time series data of a single electrical quantity. The electrical quantity is the sampling data. The number of channels varies depending on the type of equipment of the protection device and the fault recording device.

[0052] For the sampled data of each channel, a Fast Fourier Transform is performed within the calculation interval to convert the time-domain data into frequency-domain components. .

[0053] Based on the frequency domain components, the effective value sequence of each channel within the calculation interval is calculated. The effective value is calculated using the sum of squared magnitudes of the frequency domain components. The formula for calculating the effective value is as follows:

[0054] ,

[0055] in, This represents the valid value of the sampled data for each channel within the calculation interval; This indicates the first segment of the protection device waveform recording file after the sampling frequency has been uniformly processed. Sampling data of each channel Or calculate the fault recording file after interval calibration. Sampling data of each channel ; For the index of the frequency domain component; for The modulus of the frequency domain component; This represents the number of data points after the sampling frequency has been uniformly processed.

[0056] The output of the protection device waveform recording file after unified sampling frequency processing is the first... A sequence of valid values ​​for each channel: And the fault recording file after calculation interval calibration A sequence of valid values ​​for each channel: ; This indicates the first segment of the protection device waveform recording file after the sampling frequency has been uniformly processed. Sampling data of each channel The effective values ​​within the calculation interval are obtained based on the above formula for calculating effective values. ; This indicates the first fault recording file after interval calibration. Sampling data of each channel The effective values ​​within the calculation interval are obtained based on the above formula for calculating effective values. .

[0057] The waveform recording files of the protection device after the sampling frequency was uniformly processed were respectively... The effective value sequence of each channel and the fault recording file after calculation interval calibration. The effective value sequence of each channel is sorted in descending order. This sorting can be achieved using the quicksort algorithm, ensuring efficiency. (Previous data is extracted...) The maximum effective value and its corresponding timestamp are used to generate the protection device waveform recording file after the sampling frequency is uniformly processed. Maximum value sequence of each channel And the fault recording file after calculation interval calibration Maximum value sequence of each channel ,in, and These are the first and second records of the protection device waveform files after the sampling frequency has been uniformly processed. The fault recording file after calibration of the first channel and calculation interval The first channel The largest valid value, , and These are the first and second records of the protection device waveform files after the sampling frequency has been uniformly processed. The fault recording file after calibration of the first channel and calculation interval The first channel The timestamps of the largest valid values ​​represent the timestamps of the protection device waveform recording files after the sampling frequency is uniformly processed. The fault recording file after calibration of the first channel and calculation interval The first channel The time point with the largest effective value.

[0058] S4. Using a channel matching and time axis synchronization algorithm, feature matching is performed on the maximum value sequence of the protection device waveform file after sampling frequency unification processing and the maximum value sequence of the fault waveform file after calculation interval calibration, and the time offset is calculated to complete the time axis alignment of the protection device waveform file after sampling frequency unification processing and the fault waveform file after calculation interval calibration.

[0059] The first part of the protection device waveform file, after sampling frequency unification processing, is analyzed using a channel matching and time axis synchronization algorithm. The maximum value sequence of each channel and the calculated interval of the calibrated fault recording file. The maximum value sequence of each channel is matched with multi-dimensional features. Combined with channel attribute information, such as channel type, voltage, current, etc., the corresponding same channel is automatically identified. The time offset is calculated by the timestamp of the maximum effective value to achieve precise time axis synchronization at the data point level.

[0060] In order to determine the first [number] of the protection device waveform file after the sampling frequency unification processing. The fault recording file after calibration of the first channel and the calculation interval To determine whether each channel corresponds to the same electrical quantity, the maximum value sequence of each channel in the protection device waveform file after unified sampling frequency processing is used as a benchmark, and a matching channel is found in the maximum value sequence of all channels in the fault waveform file after the calculation interval is calibrated.

[0061] Matching is based on the following three conditions:

[0062] I. Value Consistency: Compare the values ​​of the protection device waveform recording files after the sampling frequency has been standardized. Each maximum RMS value in the maximum value sequence of each channel is compared with the first RMS value in the fault recording file after interval calibration. The maximum effective value corresponding to the maximum value sequence of each channel. The absolute value of the difference between the two values ​​is calculated and compared with a threshold preset based on expert experience. Compare to ensure that the largest effective values ​​are close in size.

[0063] II. Time Difference Consistency: Based on the protection device waveform recording file after unified sampling frequency processing, the first... The maximum value sequence of each channel and the fault recording file after calculation interval calibration. The timestamps corresponding to the adjacent maximum valid values ​​in the maximum value sequence of each channel, i.e. , and , Calculate the time interval difference between adjacent maximum effective values ​​and compare it with the time tolerance preset according to expert experience method. Comparison. The requirement is that the time difference consistency satisfies the condition that the time interval difference between adjacent maximum effective values ​​is less than the time tolerance. ,Right now ; and These are the first and second records of the protection device waveform files after the sampling frequency has been uniformly processed. The fault recording file after calibration of the first channel and calculation interval The first channel The timestamp with the largest valid value; and are the timestamps of the first maximum effective value of the first channel of the protection device recorded wave file after the sampling frequency unification processing and the first channel of the fault recorded wave file after the calculation interval calibration respectively. The waveform of the same electrical quantity has similar dynamic change rule during the fault, and the time interval difference of adjacent maximum effective values reflects the periodicity or mutation mode of the waveform. The consistency of time difference ensures the consistency of time rules of the two channels, thereby enhancing the reliability of matching.

[0064] III. Channel attribute consistency: The channel type, such as current or voltage, is obtained through the header files of the protection device recorded wave file after the sampling frequency unification processing and the fault recorded wave file after the calculation interval calibration, and the consistency of the channel attributes is checked. Through the attribute consistency constraint, irrelevant channels can be excluded, and the matching efficiency and accuracy are improved.

[0065] If the first channel of the fault recorded wave file after the calculation interval calibration that meets the above matching conditions is found, the first channel of the protection device recorded wave file after the sampling frequency unification processing and the first channel of the fault recorded wave file after the calculation interval calibration are considered to be the same channel.

[0066] The goal of time axis synchronization is to finely calibrate the time axis of the protection device recorded wave file after the sampling frequency unification processing and the fault recorded wave file after the calculation interval calibration based on the maximum effective value timestamps of the matching channels.

[0067] The first matching point timestamp in the matching channel is recorded, which is the first maximum effective value timestamp of the first channel of the protection device recorded wave file after the sampling frequency unification processing and the first maximum effective value timestamp of the first channel of the fault recorded wave file after the calculation interval calibration The time offset is calculated based on the first matching point timestamp :

[0068] ,

[0069] The time axis of all data points in the fault recorded wave file after the calculation interval calibration is shifted , and the time axis alignment of the protection device recorded wave file after the sampling frequency unification processing and the fault recorded wave file after the calculation interval calibration is completed.

[0070] ​​​​​​​Through channel matching based on maximum value sequence and time axis fine calibration, the data channel and time axis of the protection device recording file and the fault recording file are accurately aligned in different clock domains or in the case of time error.

[0071] In conclusion, the automatic alignment method of the substation recording file is completed.

[0072] The sequence of the embodiments is only for description, and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multi-task processing and parallel processing are also possible or can be advantageous.

[0073] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment mainly explains the difference from other embodiments.

[0074] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A method for automatic alignment of substation recording recording files, characterized in that, The method comprises the following steps: S1, obtaining the protection device recording file and the fault recording file, and performing sampling frequency uniform processing on the protection device recording file and the fault recording file to obtain the protection device recording file and the fault recording file after sampling frequency uniform processing; S2, obtaining the fault point time of the protection device recording file and the fault recording file after sampling frequency uniform processing, dividing the calculation interval, generating the protection device recording data set and the fault recording data set, and calibrating the fault recording file after sampling frequency uniform processing based on the calculation interval to generate the fault recording file data set after calculation interval calibration; S3, calculating the effective value sequence based on the protection device recording data set and the fault recording data set after calculation interval calibration, and extracting the maximum value sequence therefrom; S4, performing feature matching on the maximum value sequence of the protection device recording file after sampling frequency uniform processing and the maximum value sequence of the fault recording file after calculation interval calibration through the channel matching and time axis synchronization algorithm, taking the maximum value sequence of each channel of the protection device recording file after sampling frequency uniform processing as the reference, finding the matching channel in the maximum value sequence of all channels of the fault recording file after calculation interval calibration, and the matching conditions include value consistency, time difference consistency and channel attribute consistency; If the channel of the fault recording file after calculation interval calibration that meets the matching condition is found, the channel of the protection device recording file after sampling frequency uniform processing and the channel of the fault recording file after calculation interval calibration are considered as the same channel; based on the first matching point timestamp in the matching channel, including the first maximum effective value timestamp of the channel of the protection device recording file after sampling frequency uniform processing and the first maximum effective value timestamp of the channel of the fault recording file after calculation interval calibration, the time offset is calculated, and the time axis alignment of the protection device recording file after sampling frequency uniform processing and the fault recording file after calculation interval calibration is completed.

2. The method of automatic alignment of substation recording records according to claim 1, characterized in that, The S1 specifically comprises: The protection device recording file and the fault recording file after sampling frequency uniform processing respectively include the data set of the protection device recording file after sampling frequency uniform processing and the data set of the fault recording file after sampling frequency uniform processing.

3. The method of automatic alignment of substation recording records according to claim 1, characterized in that, The S2 specifically comprises: The calculation interval is divided from the protection device recording file and the fault recording file after sampling frequency uniform processing based on the fault point time of the protection device recording file and the fault recording file after sampling frequency uniform processing and in combination with the sampling period.

4. The method of automatic alignment of substation recording records according to claim 3, characterized in that, The S2 specifically comprises: The starting time difference is calculated based on the starting point of the calculation interval of the protection device recording file after sampling frequency uniform processing and the starting point of the calculation interval of the fault recording file after sampling frequency uniform processing; and the fault recording data set after calculation interval calibration is generated based on the starting time difference.

5. The method of automatic alignment of substation recording records according to claim 1, characterized in that, The S3 specifically comprises: The fault recording data set after the protection device recording data set and the calculation interval calibration respectively contains sampling data of one channel and sampling data of one channel, for each channel of sampling data, convert the time domain data into frequency domain components; based on the modulus square sum of the frequency domain components, calculate the effective value of each channel of sampling data in the calculation interval, thereby obtaining the effective value sequence of each channel of the protection device recording file after the sampling frequency unification processing and the fault recording file after the calculation interval calibration.

6. The method of automatic alignment of substation recording records according to claim 5, characterized in that, The S3 specifically comprises: The effective value sequences of each channel of the protection device recording wave file after the sampling frequency unification processing and the effective value sequences of each channel of the fault recording wave file after the calculation interval calibration are sorted in descending order respectively, and the first maximum effective value and the corresponding timestamp are extracted, to generate the maximum value sequences of each channel of the protection device recording wave file after the sampling frequency unification processing and the maximum value sequences of each channel of the fault recording wave file after the calculation interval calibration.

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