Generator GCB two-end voltage synchronization analysis method based on wave recording file

Abstract

A generator GCB two-end voltage synchronization analysis method based on a wave recording file mainly comprises the steps of recording waveforms after a generator-transformer group wave recording device GCB is switched on, describing and matching the voltage waveforms at the two ends of the GCB through a channel, calculating voltage amplitudes, phase angles and frequencies at the two ends of the GCB, and then performing difference analysis on the amplitudes, the phase angles and the frequencies of the voltage waveforms at the two ends of the generator GCB. And when one of the voltage amplitude comparison of the two ends of the generator GCB is abnormal, the voltage phase angle comparison of the two ends of the generator GCB is abnormal, and the voltage frequency comparison of the two ends of the generator GCB is abnormal, the voltage synchronization alarm of the two ends of the generator GCB is carried out. The safe operation state of the generator GCB is ensured, and stable operation of the generator is ensured. According to the invention, the voltage synchronization analysis of the two ends of the generator GCB is carried out based on the wave recording file, and the analysis is carried out through the data collected by the wave recording device without depending on the data collected by the synchronization device, so that the analysis conclusion is more accurate and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of voltage analysis at both ends of a generator GCB, and in particular relates to a synchronous analysis method for voltage at both ends of a generator GCB based on a wave recording file. Background Art

[0002] The operating status of the generator circuit breaker GCB (Generator Circuit Breaker) plays a vital role in the safe and stable operation of power plants, especially hydropower plants. The synchronous voltage at both ends of the generator circuit breaker GCB is an important indicator to measure the operating status of GCB. At present, the monitoring system and relay protection device of the power plant do not perform synchronous voltage analysis on both ends of the generator circuit breaker GCB after synchronization. The lack of monitoring of the operating status of GCB is not conducive to the stable operation of the generator set. Therefore, in order to discover the operating defects of the generator circuit breaker GCB in advance and improve the operating stability of the generator, it is necessary to analyze and monitor the synchronous voltage at both ends of the generator circuit breaker GCB. Since voltage transformers are installed at the generator end and the transformer side of GCB during the design and installation of GCB in the power plant, the voltage waveform at both ends of GCB can be collected by the generator set fault recording device to realize the synchronous voltage analysis at both ends of GCB.

[0003] In summary, the technical problem to be solved by the present invention is that in the prior art, the collection of three-phase voltage data at both ends of the generator GCB may be inaccurate or incomplete, resulting in unreliable subsequent analysis results. It is difficult to match the three-phase voltage channel at the generator end in the recording file with the three-phase voltage channel at the low-voltage side of the main transformer, which may cause channel confusion and affect the analysis results. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for synchronous analysis of the voltage at both ends of the generator GCB based on a recording file. The present invention ensures the safe operation state of the generator GCB and the stable operation of the generator; the analysis is performed through the collected data of the recording device, which does not rely on the data collected by the synchronization device, and the analysis conclusion is more accurate and reliable.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A method for synchronous analysis of voltage at both ends of a generator GCB based on a waveform recording file, the steps are:

[0007] Collect three-phase voltage data at both ends of the generator GCB;

[0008] Perform three-phase voltage waveform channel matching at both ends of the generator GCB;

[0009] Perform waveform alignment and power frequency fundamental wave analysis;

[0010] Perform differential analysis;

[0011] Output the synchronous analysis results of the voltage across the generator GCB.

[0012] Preferably, the acquisition of three-phase voltage data at both ends of the generator GCB comprises the following steps:

[0013] Collect the three-phase voltage at the generator end and the three-phase voltage and frequency at the low-voltage side of the main transformer;

[0014] Complete the collection of three-phase voltage information at both ends of the generator output circuit breaker GCB;

[0015] Maintaining a sampling rate of 4K, the waveform is recorded after the generator outlet circuit breaker GCB is closed to form a recording file with a period of T.

[0016] Preferably, the acquisition of the three-phase voltage at the generator end and the three-phase voltage and frequency at the low-voltage side of the main transformer comprises the following steps:

[0017] Start the wave recording device of the generator-transformer group;

[0018] Collect the three-phase voltage at the generator end;

[0019] Collect the three-phase voltage on the low-voltage side of the main transformer;

[0020] Collect the frequency at the generator end and the low-voltage side of the main transformer.

[0021] Preferably, the said maintaining a sampling rate of 4K, recording the waveform after the generator outlet circuit breaker GCB is closed, forming a recording file with a period of T, comprises the following steps:

[0022] Set the sampling rate of the recording device to 4K;

[0023] Start recording after GCB is closed;

[0024] Recording file with a recording period of T.

[0025] Preferably, the three-phase voltage waveform channel matching at both ends of the generator GCB is to match the three-phase voltage channel at the generator end and the three-phase voltage channel at the low-voltage side of the main transformer in the generator set recording file; including the following steps:

[0026] Use regular expressions to remove useless number information in channel names;

[0027] Search the text description of the keyword "generator terminal output voltage" to find the generator terminal three-phase voltage channel;

[0028] Find the three-phase voltage channel on the low-voltage side of the main transformer by searching the text description for the keyword "main transformer low-voltage side voltage";

[0029] Match the three-phase voltage channel at the generator end with the three-phase voltage channel at the low-voltage side of the main transformer by ABC.

[0030] Preferably, the waveform alignment and power frequency fundamental wave analysis is to align the waveform groups of the generator set recording files in pairs to perform voltage waveform analysis; comprising the following steps:

[0031] Analyze the amplitude and phase angle of the power frequency fundamental wave in the computer terminal voltage and the main transformer low voltage side voltage;

[0032] Full-cycle Fourier filtering is used to calculate the power frequency fundamental amplitude and phase angle of the corresponding voltage and current channels;

[0033] formula:

[0034]

[0035] Where i(k) represents the original discrete signal, N is the number of sampling points in one cycle, and I Rn and I In Respectively represent the real and imaginary parts of the nth harmonic component of the signal;

[0036] When calculating the power frequency fundamental wave component, let n = 1, and then the amplitude I of the power frequency fundamental wave of the two recorded waveforms at the corresponding time points can be calculated. n With phase angle φ n ; The formula is:

[0037]

[0038] Preferably, the differential analysis comprises the following steps:

[0039] Perform difference analysis on the amplitude and phase angle of the power frequency fundamental voltage in the pairwise aligned waveform groups;

[0040] Perform difference analysis on the phase angles of the power frequency fundamental waves in the pairwise aligned waveform groups;

[0041] Perform frequency difference analysis on pairwise aligned waveform groups.

[0042] Preferably, the difference analysis of the power frequency fundamental voltage amplitude and phase angle in the pairwise aligned waveform groups comprises the following steps:

[0043] The difference analysis of the power frequency fundamental wave voltage amplitude and phase angle includes performing difference analysis on the power frequency fundamental wave voltage amplitude and phase angle in the waveform groups aligned with each other in the generator set recording file. Assume U max is the maximum value of the power frequency fundamental voltage amplitude, U is the number of recording sampling points, and U set The difference exceeds the limit sampling point threshold, which is 0.02U.

[0044] Assume that the two comparison signals are S1 and S2, and the effective value sequences of the aligned power frequency fundamental amplitude are S 1i and S 2i ;

[0045] The number of points exceeding the threshold is counted by making a point-by-point difference; the formula is:

[0046]

[0047] Among them U i is the voltage amplitude difference point, S set is the difference threshold, set to 0.01U max After the statistics are completed, the length of the longest sequence of consecutive 1s in Ui is calculated. If Ui>Uset, it means that the amplitude difference meets the time threshold.

[0048] Preferably, the difference analysis of the power frequency fundamental wave phase angles in the pairwise aligned waveform groups comprises the following steps:

[0049] Assume that the pairwise comparison signals are M1 and M2, and their aligned power frequency fundamental wave phase angle sequences are M 1i and M 2i ;

[0050] The number of points exceeding the threshold is counted by making a point-by-point difference; the formula is:

[0051]

[0052] Where V i is the voltage phase angle difference point, M set is the difference threshold, set to 0.1°. After the statistics are completed, calculate V i The length of the longest sequence of consecutive 1s in i >V set =0, indicating that the phase angle difference meets the time threshold.

[0053] Preferably, the frequency difference analysis of the pairwise aligned waveform groups comprises the following steps:

[0054] Assume that the pairwise comparison signals are F1 and F2, and their aligned frequency sequences are F 1i and F 2i ;

[0055] The number of points exceeding the threshold is counted by making a point-by-point difference; the formula is:

[0056]

[0057] Where E i is the frequency difference point, Fset is the difference threshold, set to 0.1Hz. After the statistics are completed, calculate the length of the longest sequence of consecutive 1s in Ei. If E i >E set =0, indicating that the frequency difference meets the time threshold.

[0058] Preferably, the voltage synchronous analysis result of the generator GCB is as follows:

[0059] Analysis of the comparison results of voltage amplitude, phase angle and frequency at both ends of the generator GCB;

[0060] The synchronous voltage analysis at both ends of the generator GCB is abnormal and an alarm is issued: If any of the voltage amplitude comparison at both ends of the generator GCB is abnormal, the voltage phase angle comparison at both ends of the generator GCB is abnormal, and the voltage frequency comparison at both ends of the generator GCB is abnormal, the synchronous voltage analysis at both ends of the generator GCB is determined to be abnormal and an alarm is issued.

[0061] Preferably, the voltage amplitude, phase angle and frequency comparison result analysis of the generator GCB is carried out in the following steps:

[0062] When the voltage amplitude difference and time between the two voltages meet the set threshold, the voltage amplitude comparison result at both ends of the generator GCB is determined to be abnormal;

[0063] When the voltage phase angle difference and time between the two voltages meet the set threshold, it is determined that the voltage phase angle comparison result at both ends of the generator GCB is abnormal;

[0064] When the voltage-frequency difference and time between the two voltages meet the set threshold, it is determined that the voltage-frequency comparison result at both ends of the generator GCB is abnormal.

[0065] A synchronous analysis system for voltage at both ends of a generator GCB based on a wave recording file adopts the synchronous analysis method for voltage at both ends of a generator GCB based on a wave recording file.

[0066] The present invention can achieve the following beneficial effects:

[0067] In order to improve the voltage monitoring function at both ends of the existing generator outlet circuit breaker GCB and solve the voltage monitoring problem at both ends of the existing generator outlet circuit breaker GCB, the present invention proposes a synchronous analysis method for the voltage at both ends of the generator GCB based on a recording file, which can solve the lack of the voltage monitoring function at both ends of the generator outlet circuit breaker GCB in the current hydropower plant system, improve the synchronous voltage monitoring and analysis capabilities of the GCB ends of the hydropower plant generator set, and improve the system operation stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0069] Figure 1This is a schematic diagram of voltage data collection at both ends of the generator GCB of the present invention;

[0070] Figure 2 It is a flow chart of aligning voltage waveforms at both ends of the generator GCB of the present invention;

[0071] Figure 3 This is a flow chart of the voltage synchronization analysis at both ends of the generator GCB of the present invention;

[0072] Figure 4 This is a warning logic diagram for the voltage synchronization analysis at both ends of the generator GCB of the present invention. DETAILED DESCRIPTION

[0073] The preferred solution is Figures 1 to 4 As shown in the figure, a method for analyzing the voltage synchronization at both ends of the generator GCB based on the waveform recording file is used to evaluate the synchronization status of the GCB by collecting and analyzing the three-phase voltage data at both ends of the generator GCB. The specific steps are as follows:

[0074] Step 1. Collecting three-phase voltage data at both ends of the generator GCB; specifically, comprising the following steps:

[0075] Step 1.1: The generator-transformer group recording device collects the three-phase voltage at the generator end and the three-phase voltage and frequency at the low-voltage side of the main transformer.

[0076] Sub-step 1.1.1: Start the generator-transformer group recording device.

[0077] Sub-step 1.1.2: Collect the three-phase voltage at the generator terminal.

[0078] Sub-step 1.1.3: Collect the three-phase voltage on the low-voltage side of the main transformer.

[0079] Sub-step 1.1.4: Collect the frequency at the generator end and the low-voltage side of the main transformer.

[0080] Step 1.2: Complete the collection of three-phase voltage information at both ends of the generator output circuit breaker GCB.

[0081] Sub-step 1.2.1: Ensure that the collected data contains the three-phase voltage information across the GCB.

[0082] Step 1.3: The generator set recording device maintains a sampling rate of 4K, and records the waveform after the generator outlet circuit breaker GCB is closed, forming a recording file with a period of T.

[0083] Sub-step 1.3.1: Set the sampling rate of the recording device to 4K.

[0084] Sub-step 1.3.2: Start recording after the GCB is closed.

[0085] Sub-step 1.3.3: Record the waveform file with a period of T.

[0086] Step 2. The three-phase voltage waveform channels at both ends of the generator GCB are matched, specifically, including the following steps:

[0087] Step 2.1: Match the three-phase voltage channel at the generator end in the generator set recording file with the three-phase voltage channel at the low-voltage side of the main transformer.

[0088] Sub-step 2.1.1: Use regular expressions to remove useless number information from channel names.

[0089] Sub-step 2.1.2: Find the generator end three-phase voltage channel by searching the text description for the keyword "generator end output voltage".

[0090] Sub-step 2.1.3: Find the three-phase voltage channel on the low-voltage side of the main transformer by searching the text description for the keyword "main transformer low-voltage side voltage".

[0091] Sub-step 2.1.4: Match the three-phase voltage channel at the generator end with the three-phase voltage channel at the low-voltage side of the main transformer by ABC.

[0092] Step 3. Waveform alignment and power frequency fundamental wave analysis, specifically, includes the following steps:

[0093] Step 3.1: Align the generator set recording files in pairs to perform voltage waveform analysis.

[0094] Sub-step 3.1.1: Analyze the amplitude and phase angle of the power frequency fundamental wave in the computer terminal voltage and the main transformer low-voltage side voltage.

[0095] Sub-step 3.1.2: Use full-cycle Fourier filtering to calculate the power frequency fundamental amplitude and phase angle of the corresponding voltage and current channels. Formula:

[0096]

[0097] Where i(k) represents the original discrete signal, N is the number of sampling points in one cycle, and I Rn and I In Respectively represent the real and imaginary parts of the nth harmonic component of the signal;

[0098] When finding the power frequency fundamental wave component, let n = 1, and then the amplitude and phase angle of the power frequency fundamental waves of the two recorded waveforms at corresponding time points can be calculated; the formula is:

[0099]

[0100] The waveform model of the generator terminal voltage and the main transformer low-voltage side voltage in the generator set recording file can be expressed as

[0101]

[0102] The waveform formula of the voltage at the machine end and the voltage at the low voltage side of the main transformer By taking the time derivative, the frequencies corresponding to the machine-end voltage and the low-voltage side voltage of the main transformer at each time point are calculated respectively.

[0103] Step 4. Difference analysis, as shown in the attached Figure 3 , is a flow chart of the voltage synchronization analysis at both ends of the generator GCB, specifically, including the following steps:

[0104] Step 4.1: Perform difference analysis on the amplitude and phase angle of the power frequency fundamental voltage in the pairwise aligned waveform groups.

[0105] Sub-step 4.1.1: Assume that the pairwise comparison signals are S1 and S2, and their aligned power frequency fundamental wave amplitude effective value sequences are S 1i and S 2i ;

[0106] Sub-step 4.1.2: Count the number of points exceeding the threshold by making a point-by-point difference; the formula is:

[0107]

[0108] The difference analysis of the power frequency fundamental wave voltage amplitude and phase angle includes performing difference analysis on the power frequency fundamental wave voltage amplitude and phase angle in the waveform groups aligned with each other in the generator set recording file. Assume U max is the maximum value of the power frequency fundamental voltage amplitude, U is the number of recording sampling points, and U set The difference exceeds the limit sampling point threshold, which is 0.02U.

[0109] Among them U i is the voltage amplitude difference point, S set is the difference threshold, set to 0.01U max .

[0110] Sub-step 4.1.3: After the statistics are completed, calculate the length of the longest sequence of consecutive 1s in Ui. If Ui>Uset, it means that the amplitude difference meets the time threshold.

[0111] Step 4.2: Perform difference analysis on the phase angles of the power frequency fundamental waves in the pairwise aligned waveform groups.

[0112] Sub-step 4.2.1: Assume that the pairwise comparison signals are M1 and M2, and their aligned power frequency fundamental wave phase angle sequences are M 1i and M 2i ;

[0113] Sub-step 4.2.2: Count the number of points exceeding the threshold by making a point-by-point difference; the formula is:

[0114]

[0115] Where V i is the voltage phase angle difference point, M set is the difference threshold, set to 0.1°.

[0116] Sub-step 4.2.3: After statistics are completed, calculate V i The length of the longest sequence of consecutive 1s in i >V set =0, indicating that the phase angle difference meets the time threshold.

[0117] Step 4.3: Perform frequency difference analysis on the pairwise aligned waveform groups.

[0118] Sub-step 4.3.1: Assume that the pairwise comparison signals are F1 and F2, and their aligned frequency sequences are F 1i and F 2i ;

[0119] Sub-step 4.3.2: Count the number of points exceeding the threshold by making a point-by-point difference; the formula is:

[0120]

[0121] Where E i is the frequency difference point, F set is the difference threshold, set to 0.1Hz.

[0122] Sub-step 4.3.3: After the statistics are completed, calculate the length of the longest sequence of consecutive 1s in Ei. i >E set =0, indicating that the frequency difference meets the time threshold.

[0123] Step 5. Synchronous analysis results of voltage at both ends of the generator GCB

[0124] Step 5.1: Analyze the voltage amplitude, phase angle, and frequency comparison results across the generator GCB.

[0125] Sub-step 5.1.1: When the voltage amplitude difference and time between the two voltages meet the set threshold, it is determined that the voltage amplitude comparison result at both ends of the generator GCB is abnormal.

[0126] Sub-step 5.1.2: When the voltage phase angle difference and time between the two voltages meet the set threshold, it is determined that the voltage phase angle comparison result at both ends of the generator GCB is abnormal.

[0127] Sub-step 5.1.3: When the voltage-frequency difference and time between the two voltages meet the set threshold, it is determined that the voltage-frequency comparison result across the generator GCB is abnormal.

[0128] Step 5.2: The synchronous voltage analysis at both ends of the generator GCB is abnormal and an alarm is issued.

[0129] Sub-step 5.2.1: If any one of the voltage amplitude comparison at both ends of the generator GCB is abnormal, the voltage phase angle comparison at both ends of the generator GCB is abnormal, and the voltage frequency comparison at both ends of the generator GCB is abnormal, it is determined that the voltage synchronization analysis at both ends of the generator GCB is abnormal and an alarm is issued.

[0130] Through the above logical steps, this method provides a complete generator GCB synchronization analysis method based on recording files, ensuring that data acquisition, channel matching, waveform alignment, power frequency fundamental wave analysis, difference analysis and final synchronization analysis result determination can be performed efficiently and accurately.

[0131] A synchronous analysis system for voltage at both ends of a generator GCB based on a wave recording file adopts the synchronous analysis method for voltage at both ends of a generator GCB based on a wave recording file.

[0132] The generator-transformer group recording device collects the three-phase voltage at the generator end and the three-phase voltage and frequency at the low-voltage side of the main transformer, and completes the collection of the three-phase voltage information at both ends of the generator output circuit breaker GCB;

[0133] The generator set recording device maintains a sampling rate of 4K, and the waveform recorded after the generator outlet circuit breaker GCB is closed forms a recording file with a period of T, which provides a recording file for the synchronous analysis of the voltage at both ends of the circuit breaker GCB;

[0134] Match the three-phase voltage channel at the generator end and the three-phase voltage channel at the low-voltage side of the main transformer in the recording file of the generator set recording device, use regular expressions to delete useless numbering information in the channel name in the recording channel of the generator set recording file, find the three-phase voltage channel at the generator end by searching the text description for the keyword "generator end outlet voltage", find the three-phase voltage channel at the low-voltage side of the main transformer by searching the text description for the keyword "main transformer low-voltage side voltage", and match the three-phase voltage channel at the generator end with the three-phase voltage channel at the low-voltage side of the main transformer by ABC.

[0135] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A method for synchronous analysis of voltage at both ends of a generator GCB based on a waveform recording file, characterized in that The following steps are involved: Collect three-phase voltage data at both ends of the generator GCB; Perform three-phase voltage waveform channel matching at both ends of the generator GCB; Perform waveform alignment and power frequency fundamental wave analysis; Perform differential analysis; Output the synchronous analysis results of the voltage across the generator GCB.

2. The method for synchronous analysis of voltage at both ends of a generator GCB based on a wave recording file according to claim 1, characterized in that: The method of collecting three-phase voltage data at both ends of the generator GCB comprises the following steps: Collect the three-phase voltage at the generator end and the three-phase voltage and frequency at the low-voltage side of the main transformer; Complete the collection of three-phase voltage information at both ends of the generator output circuit breaker GCB; Maintaining a sampling rate of 4K, the waveform is recorded after the generator outlet circuit breaker GCB is closed to form a recording file with a period of T.

3. The method for synchronous analysis of voltage at both ends of a generator GCB based on a wave recording file according to claim 2, characterized in that: The method of collecting the three-phase voltage at the generator end and the three-phase voltage and frequency at the low-voltage side of the main transformer comprises the following steps: Start the wave recording device of the generator-transformer group; Collect the three-phase voltage at the generator end; Collect the three-phase voltage on the low-voltage side of the main transformer; Collect the frequency at the generator end and the low-voltage side of the main transformer.

4. The method for synchronous analysis of voltage at both ends of a generator GCB based on a wave recording file according to claim 2, characterized in that: The method of maintaining a sampling rate of 4K and recording the waveform after the generator outlet circuit breaker GCB is closed to form a recording file with a period of T includes the following steps: Set the sampling rate of the recording device to 4K; Start recording after GCB is closed; Recording file with a recording period of T.

5. The method for synchronous analysis of voltage at both ends of a generator GCB based on a wave recording file according to claim 1, characterized in that: The three-phase voltage waveform channel matching at both ends of the generator GCB is to match the three-phase voltage channel at the generator end and the three-phase voltage channel at the low-voltage side of the main transformer in the generator set recording file; including the following steps: Use regular expressions to remove useless number information in channel names; Search the text description of the keyword "generator terminal output voltage" to find the generator terminal three-phase voltage channel; The three-phase voltage channel on the low-voltage side of the main transformer is found by searching the text description of the keyword "main transformer low-voltage side voltage"; the three-phase voltage channel on the generator end is matched with the three-phase voltage channel on the low-voltage side of the main transformer by ABC.

6. The method for synchronous analysis of voltage at both ends of a generator GCB based on a recording file according to claim 1, characterized in that: The waveform alignment and power frequency fundamental wave analysis is to align the waveform groups of the generator set recording files in pairs to perform voltage waveform analysis; The following steps are involved: Analyze the amplitude and phase angle of the power frequency fundamental wave in the computer terminal voltage and the main transformer low voltage side voltage; Full-cycle Fourier filtering is used to calculate the power frequency fundamental amplitude and phase angle of the corresponding voltage and current channels; formula: Where i(k) represents the original discrete signal, N is the number of sampling points in one cycle, and I Rn and I In Respectively represent the real and imaginary parts of the nth harmonic component of the signal; When calculating the power frequency fundamental wave component, let n = 1, and then the amplitude I of the power frequency fundamental wave of the two recorded waveforms at the corresponding time points can be calculated. n With phase angle φ n ; The formula is:

7. The method for synchronous analysis of voltage at both ends of a generator GCB based on a waveform recording file according to claim 1, characterized in that: The differential analysis comprises the following steps: Perform difference analysis on the amplitude and phase angle of the power frequency fundamental voltage in the pairwise aligned waveform groups; Perform difference analysis on the phase angles of the power frequency fundamental waves in the pairwise aligned waveform groups; Perform frequency difference analysis on pairwise aligned waveform groups.

8. The method for synchronous analysis of voltage at both ends of a generator GCB based on a wave recording file according to claim 7, characterized in that: The method of performing difference analysis on the power frequency fundamental voltage amplitude and phase angle in the pairwise aligned waveform groups comprises the following steps: The difference analysis of the power frequency fundamental wave voltage amplitude and phase angle includes performing difference analysis on the power frequency fundamental wave voltage amplitude and phase angle in the waveform groups aligned with each other in the generator set recording file. Assume U max is the maximum value of the power frequency fundamental voltage amplitude, U is the number of recording sampling points, and U set The threshold of the number of sampling points when the difference exceeds the limit is 0.02U; Assume that the two comparison signals are S1 and S2, and the effective value sequences of the aligned power frequency fundamental amplitude are S 1i and S 2i ; The number of points exceeding the threshold is counted by making a point-by-point difference; the formula is: Among them U i is the voltage amplitude difference point, S set is the difference threshold, set to 0.01U max After the statistics are completed, the length of the longest sequence of consecutive 1s in Ui is calculated. If Ui>Uset, it means that the amplitude difference meets the time threshold.

9. The method for synchronous analysis of voltage at both ends of a generator GCB based on a wave recording file according to claim 7, characterized in that: The difference analysis is performed on the phase angles of the power frequency fundamental waves in the pairwise aligned waveform groups; The following steps are involved: Assume that the pairwise comparison signals are M1 and M2, and their aligned power frequency fundamental wave phase angle sequences are M 1i and M 2i ; The number of points exceeding the threshold is counted by making a point-by-point difference; the formula is: Where V i is the voltage phase angle difference point, M set is the difference threshold, set to 0.1°. After the statistics are completed, calculate V i The length of the longest sequence of consecutive 1s in i >V set =0, indicating that the phase angle difference meets the time threshold.

10. The method for synchronous analysis of voltage at both ends of a generator GCB based on a recording file according to claim 7, characterized in that: The method of performing frequency difference analysis on the pairwise aligned waveform groups comprises the following steps: Assume that the pairwise comparison signals are F1 and F2, and their aligned frequency sequences are F 1i and F 2i ; The number of points exceeding the threshold is counted by making a point-by-point difference; the formula is: Where E i is the frequency difference point, F set is the difference threshold, set to 0.1Hz. After the statistics are completed, calculate the length of the longest sequence of consecutive 1s in Ei. If E i >E set =0, indicating that the frequency difference meets the time threshold.

11. The method for synchronous analysis of voltage at both ends of a generator GCB based on a waveform recording file according to claim 1, characterized in that: The synchronous analysis result of the voltage across the generator GCB is as follows: Analysis of the comparison results of voltage amplitude, phase angle and frequency at both ends of the generator GCB; The synchronous voltage analysis at both ends of the generator GCB is abnormal and an alarm is issued: If any of the voltage amplitude comparison at both ends of the generator GCB is abnormal, the voltage phase angle comparison at both ends of the generator GCB is abnormal, and the voltage frequency comparison at both ends of the generator GCB is abnormal, the synchronous voltage analysis at both ends of the generator GCB is determined to be abnormal and an alarm is issued.

12. The method for synchronous analysis of voltage at both ends of a generator GCB based on a wave recording file according to claim 11, characterized in that: The voltage amplitude, phase angle and frequency comparison result analysis of the generator GCB is as follows: When the voltage amplitude difference and time between the two voltages meet the set threshold, the voltage amplitude comparison result at both ends of the generator GCB is determined to be abnormal; When the voltage phase angle difference and time between the two voltages meet the set threshold, the voltage phase angle comparison result at both ends of the generator GCB is determined to be abnormal; When the voltage-frequency difference and time between the two voltages meet the set threshold, it is determined that the voltage-frequency comparison result at both ends of the generator GCB is abnormal.

13. A synchronous analysis system for voltage at both ends of a generator GCB based on a waveform recording file, characterized in that: A synchronous analysis method for voltage across the GCB of a generator based on a wave recording file according to any one of claims 1 to 12 is adopted.

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