Phase compensation method of multifunctional electric power digital display instrument

Abstract

The invention discloses a phase compensation method of a multifunctional electric power digital display instrument, relates to the technical field of phase compensation, and aims to solve the problem that phase differences of various detection circuits in the multifunctional electric power digital display instrument are incompatible. Setting a power frequency locking experiment in a correction environment to determine the power frequency of a reference signal, calculating a power frequency period according to the power frequency of the reference signal, setting an oversampling frequency, calculating a sampling interval by using a geometric average method according to the power frequency period and the oversampling frequency, determining the sampling interval, calculating a sampling point interval difference, and obtaining historical data; selecting direct compensation or time delay adjustment by using fuzzy reasoning according to the historical data and the sampling point interval difference, detecting channel noise, collecting the phase difference of each channel, converting the phase difference into a phase time difference, and completing phase compensation according to the phase time difference when the time delay adjustment is selected.

Description

Technical Field

[0001] The present invention relates to the technical field of phase compensation, and more specifically, to a phase compensation method for a multifunctional electric power digital display instrument. Background Art

[0002] Phase compensation technology is a method used to adjust the signal phase to improve system performance. It is widely used in signal processing, control systems and communications. Applying phase compensation technology to the phase compensation of multifunctional power digital display instruments can improve the measurement accuracy of multifunctional power digital display instruments.

[0003] The prior art has the following deficiencies:

[0004] In the past, multifunctional electric power digital display instruments contained multiple detection circuits for detecting different physical quantities. However, there was a deviation in the position of each detection circuit, resulting in a phase difference between the detection circuits. Since the detection requirements of different circuits are different, the compensation amount for the phase difference is also different, resulting in incompatibility of various detection circuits in the multifunctional electric power digital display instrument and reduced measurement accuracy. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a phase compensation method for a multifunctional electric power digital display meter, which detects the interference electromagnetic and voltage fluctuations caused by the introduction of different industrial frequency reference signals into the circuit, screens the industrial frequency of the reference signal, and selects different phase compensation algorithms for phase compensation in combination with the phase difference degree of each channel and the channel noise to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A phase compensation method for a multifunctional electric power digital display instrument comprises the following steps:

[0008] Step S1: before performing a function test on the multifunctional electric power digital display meter, obtaining a normal power frequency cycle of a reference signal, and performing a power frequency locking experiment according to the normal power frequency cycle;

[0009] Step S2: determining the power frequency of the reference signal through a power frequency locking experiment, calculating the power frequency period according to the power frequency of the reference signal, determining the total number of sampling points according to a preset number of oversampling times, and calculating the sampling point interval based on the total number of sampling points and the power frequency period of the reference signal;

[0010] Step S3: Acquire historical data, calculate sampling point interval difference by integrating historical data and sampling point interval, detect channel noise, and select direct compensation or time delay adjustment by integrating sampling point interval difference and channel noise between channels;

[0011] Step S4: When time delay adjustment is selected, the first channel voltage is used as a reference, a reference signal with a phase difference of zero is applied to each channel, the phase difference of each channel is collected, the phase difference is converted into a phase time difference, and phase compensation is completed according to the phase time difference.

[0012] In a preferred embodiment, in step S1, the conventional power frequency cycle refers to the AC power frequency range used in the power system; after obtaining the conventional power frequency cycle, the conventional power frequency cycle is divided according to a preset power frequency selection interval, and the power frequencies corresponding to the numerical values ​​of the multiple interval points obtained by the division are used as the experimental power frequencies for the power frequency locking experiment.

[0013] In a preferred embodiment, in step S1, when performing an industrial frequency locking experiment, the voltage measurement circuit inside the three-phase multifunctional digital display instrument is connected, and multiple experimental industrial frequency reference signals are sequentially transmitted to the voltage measurement circuit, and the three-phase multifunctional digital display instrument is connected to a spectrum analyzer and an oscilloscope to respectively detect the interference electromagnetic and voltage fluctuations corresponding to the industrial frequency reference signal.

[0014] In a preferred embodiment, in step S2, the interference electromagnetic and voltage fluctuation when each power frequency reference signal is transmitted to the voltage measurement circuit are used to calculate the power frequency coefficient when the reference signals of different power frequencies are transmitted to the voltage measurement circuit using the geometric mean method. The calculation formula of the geometric mean method is: Among them, g is the power frequency coefficient, c is the electromagnetic interference when the reference signal corresponding to the power frequency is transmitted to the voltage measurement circuit, and d is the voltage fluctuation when the reference signal corresponding to the power frequency is transmitted to the voltage measurement circuit;

[0015] The power frequency corresponding to the minimum value of the power frequency coefficient is used as the power frequency of the reference signal, a period of time is selected as the calculation period, and the ratio of the power frequency of the reference signal to the calculation period is used as the power frequency period of the reference signal.

[0016] In a preferred embodiment, in step S2, the specific steps of calculating the sampling point interval are as follows:

[0017] Set the number of basic sampling points: Set the number of basic sampling points in a complete power frequency cycle to N;

[0018] Set the number of oversampling times: Set the number of oversampling times OSMPN;

[0019] Calculate the total number of sampling points: take the product of the basic sampling points and the number of oversampling times as the total number of sampling points;

[0020] After the total number of sampling points is calculated, the sampling points are evenly distributed within the power frequency period of the sampling signal, and the ratio of the power frequency period of the reference signal to the total number of sampling points is used as the sampling point interval.

[0021] In a preferred embodiment, in step S3, the historical data is the acquired historical sampling point intervals, and the sampling point interval of each sampling point is subtracted from the historical sampling point interval to obtain the sampling point interval difference.

[0022] In a preferred embodiment, in step S3, the sampling point interval difference between each channel and the channel noise are comprehensively considered to select direct compensation or time delay adjustment by using fuzzy reasoning, and the steps are as follows:

[0023] The sampling point interval difference of each channel and the channel noise are used as input variables;

[0024] The phase difference compensation algorithm is defined as an output variable;

[0025] Set fuzzy rules to describe the impact of different input variables on output variables;

[0026] Select direct compensation or time delay adjustment based on the output result.

[0027] In a preferred embodiment, in step S4, when direct compensation is selected as the phase difference compensation algorithm, the sampling point interval of the sampling points of each channel is corrected and adjusted to the historical sampling point interval. When time delay adjustment is selected as the phase difference compensation algorithm, the first channel voltage is used as a reference, a reference signal with a phase difference of zero is applied to each channel, the phase difference of each channel is collected, and the phase difference is converted into a phase time difference before phase compensation is performed.

[0028] In a preferred embodiment, in step S4: using time delay adjustment to perform phase compensation, the specific steps are as follows:

[0029] Determine the delay amount: Calculate the phase time difference based on the phase difference of each channel and the power frequency period of the reference signal using the time delay conversion formula: Where Δt is the phase time difference, is the phase difference, T is the power frequency period of the reference signal;

[0030] Calculate the channel sampling point interval difference: take the ratio of the phase time difference of each channel to the sampling point interval as the sampling point interval difference of each channel;

[0031] Adjust sampling points: When the sampling point interval difference is a positive number, the sampling point interval difference is taken to adjust the corresponding sampling point backward; when the sampling point interval difference is a negative number, the absolute value of the sampling point interval difference is taken to adjust the corresponding sampling point forward.

[0032] The technical effects and advantages of the phase compensation method of a multifunctional electric power digital display instrument of the present invention are as follows:

[0033] The present invention detects the calibration environment, obtains the normal power frequency cycle of the reference signal, sets a power frequency locking experiment in the calibration environment to determine the power frequency of the reference signal, calculates the power frequency cycle according to the power frequency of the reference signal, greatly reduces the external error introduced by the power frequency of the reference signal, sets the number of oversampling times, calculates the sampling interval according to the power frequency cycle and the number of oversampling times, calculates the sampling point interval difference after determining the sampling interval, obtains historical data, selects direct compensation or time delay adjustment based on the historical data and the sampling point interval difference, determines the direction for phase compensation, reduces the compensation cost, and when time delay adjustment is selected, detects channel noise, collects the phase difference of each channel, converts the phase difference into a phase time difference, completes phase compensation according to the phase time difference, and improves the measurement accuracy of the internal detection circuit of the multifunctional electric power digital display meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The present invention is a schematic diagram of a phase compensation method for a multifunctional electric power digital display instrument. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The present invention detects the calibration environment, obtains the normal power frequency cycle of the reference signal, sets a power frequency locking experiment in the calibration environment to determine the power frequency of the reference signal, calculates the power frequency cycle according to the power frequency of the reference signal, sets the number of oversampling times, calculates the sampling interval according to the power frequency cycle and the number of oversampling times, calculates the sampling point interval difference after determining the sampling interval, obtains historical data, selects direct compensation or time delay adjustment based on the historical data and the sampling point interval difference, and when time delay adjustment is selected, detects channel noise, collects phase differences of each channel, converts the phase differences into phase time differences, and completes phase compensation according to the phase time differences.

[0037] Embodiment, a phase compensation method of a multifunctional electric power digital display instrument, such as Figure 1 As shown, the following steps are included:

[0038] Step S1: before performing a function test on the multifunctional electric power digital display meter, obtaining a normal power frequency cycle of a reference signal, and performing a power frequency locking experiment according to the normal power frequency cycle;

[0039] Step S2: determining the power frequency of the reference signal through a power frequency locking experiment, calculating the power frequency period according to the power frequency of the reference signal, determining the total number of sampling points according to a preset number of oversampling times, and calculating the sampling point interval based on the total number of sampling points and the power frequency period of the reference signal;

[0040] Step S3: Acquire historical data, calculate sampling point interval difference by integrating historical data and sampling point interval, detect channel noise, and select direct compensation or time delay adjustment by integrating sampling point interval difference and channel noise between channels;

[0041] Step S4: When time delay adjustment is selected, the first channel voltage is used as a reference, a reference signal with a phase difference of zero is applied to each channel, the phase difference of each channel is collected, the phase difference is converted into a phase time difference, and phase compensation is completed according to the phase time difference.

[0042] The specific implementation is as follows:

[0043] In step S1, before performing a function test on the multifunctional electric power digital display meter, access a frequency monitoring website to obtain a normal power frequency cycle of a reference signal;

[0044] The conventional power frequency cycle refers to the AC frequency range used in the power system, such as between 50 Hz and 60 Hz. After obtaining the conventional power frequency cycle, the power frequency selection interval is set, and the conventional power frequency cycle is divided using the power frequency selection interval. The power frequencies corresponding to the values ​​of the multiple interval points obtained by the division are used as the experimental power frequencies of the power frequency locking experiment.

[0045] When conducting the power frequency locking experiment, connect the voltage measurement circuit inside the three-phase multi-function digital display instrument, transmit the reference signals of multiple experimental power frequencies to the voltage measurement circuit in sequence, and connect the three-phase multi-function digital display instrument to the spectrum analyzer and oscilloscope to respectively detect the interference electromagnetic and voltage fluctuations of the corresponding power frequency reference signal.

[0046] Interference electromagnetic refers to the impact of external electromagnetic fields on electronic equipment or systems. Large interference electromagnetics can lead to reduced equipment performance and functional failure, resulting in large errors in collected data.

[0047] Voltage fluctuation refers to the phenomenon that the voltage in the power system changes over time, which is usually manifested as an increase or decrease in voltage. Excessive voltage fluctuation will affect the normal operation of power equipment, resulting in large detection errors and affecting the accuracy of correction.

[0048] It should be noted that the frequency monitoring website provides real-time monitoring and analysis data of various power grid frequencies, which is used to obtain the normal industrial frequency period of the reference signal in this example; a spectrum analyzer is an instrument used to measure and display signal spectra, which can measure the electromagnetic interference when the reference signal is transmitted to the voltage measurement circuit; an oscilloscope is an electronic measuring instrument used to observe and analyze the waveform of electrical signals, and graphically display the changes of voltage signals over time to obtain voltage fluctuations.

[0049] In step S2, the electromagnetic interference and voltage fluctuation when the reference signal of each power frequency is transmitted to the voltage measurement circuit are obtained, and the power frequency coefficient when the reference signal of different power frequencies is transmitted to the voltage measurement circuit is calculated by using the geometric mean method. The calculation formula of the geometric mean method is: Among them, g is the power frequency coefficient, c is the electromagnetic interference when the reference signal corresponding to the power frequency is transmitted to the voltage measurement circuit, and d is the voltage fluctuation when the reference signal corresponding to the power frequency is transmitted to the voltage measurement circuit;

[0050] Obtain the power frequency coefficients of the reference signals of different power frequencies and pass them into the voltage measurement circuit for comparison, select the minimum value among the power frequency coefficients, use the power frequency corresponding to the minimum value among the power frequency coefficients as the power frequency of the reference signal, calculate the power frequency period according to the power frequency of the reference signal, select a period of time as the calculation period, and use the ratio of the power frequency of the reference signal to the calculation period as the power frequency period of the reference signal;

[0051] The basic number of sampling points is set within the power frequency period of the reference signal, and the sampling points are calculated using the preset oversampling times. The oversampling times refers to the coefficient of sampling at a frequency higher than the Nyquist frequency during the signal sampling process. The Nyquist frequency is twice the highest frequency in the signal.

[0052] The 32-point full-wave Fourier algorithm is used to oversample each sampling point to determine the total number of sampling points. The specific steps are as follows:

[0053] Set the number of basic sampling points: Set the number of basic sampling points in a complete power frequency cycle to N;

[0054] Set the number of oversampling times: Set the number of oversampling times OSMPN;

[0055] Calculate the total number of sampling points: take the product of the basic sampling points and the number of oversampling times as the total number of sampling points, that is, Z = N*OSMPN, where Z is the total number of sampling points.

[0056] After the total number of sampling points is calculated, the sampling points are evenly distributed within the power frequency period of the sampling signal, and the ratio of the power frequency period of the reference signal to the total number of sampling points is used as the sampling point interval.

[0057] It should be noted that the 32-point full-wave Fourier algorithm is a frequency domain analysis method for signal processing, which is used to process the sampling points to determine the total number of sampling points. This example takes the basic number of sampling points as 32 and the preset oversampling number OSMPN as 64 times. For example, the power frequency period of the reference signal is 20ms, and the total number of sampling points Z is the product of the basic number of sampling points and the oversampling number OSMPN, which is 2048. Then the sampling point interval is 20ms / 2048=0.009765625ms. In addition, the oversampling number mentioned above is not unique and can be set according to actual conditions. For example, the oversampling number can be set to 32, 64, 128, etc., which will not be analyzed here.

[0058] In step S3, the historical data is the acquired historical sampling point intervals, and the sampling point interval of each sampling point is subtracted from the historical sampling point interval to obtain the sampling point interval difference;

[0059] The phase difference between the sampling points is linearly related to the sampling point interval difference. When the phase difference between the sampling points is larger, the sampling point interval difference is larger. The data can be phase compensated by adjusting the sampling point interval difference.

[0060] Connect the multifunctional digital power meter to the noise meter, and detect the channel noise of each channel when applying the reference signal to each channel;

[0061] Calculate the average sampling point interval difference and channel noise of each channel, and use fuzzy reasoning to select the phase difference compensation algorithm based on the sampling point interval difference and channel noise of each channel. The specific steps are as follows:

[0062] Define input: Take the sampling point interval difference and channel noise of each channel as input variables and divide them into different fuzzy sets; for example, "High", "Low" for sampling point interval difference, "Big", "Small" for channel noise;

[0063] Define output: Define the phase difference compensation algorithm as the output variable and divide it into fuzzy sets; for example, "ONE", "TWO" for the phase difference compensation algorithm;

[0064] Formulate fuzzy rules: Set a set of fuzzy rules to describe the impact of different input variables on output variables. For example, mark the sampling point interval difference as J, the channel noise as T, and define the phase difference compensation algorithm as X, then define

[0065] Rule1:IF(J is Low)AND(T is Small)THEN(X is ONE)

[0066] Rule2: IF(J is High)AND(T is Big)THEN(X is TWO) ...

[0068] Algorithm selection: When the output result is "ONE", direct compensation is used as the phase difference compensation algorithm; when the output result is "TWO", time delay adjustment is used as the phase difference compensation algorithm.

[0069] It should be noted that the noise meter is an instrument for detecting noise. In this example, it is used to detect the channel noise when the reference signal is applied to each channel. The division of the fuzzy set can be adjusted according to the actual situation. For the sampling point interval difference of each channel and the judgment of the channel noise level, the threshold can be set according to the actual situation. In this example, when the acquisition point interval difference exceeds the average sampling point interval difference of each channel, it is calibrated as "High"; when the channel noise exceeds the average channel noise of each channel, it is calibrated as "Big", etc., which will not be elaborated here.

[0070] In step S4, if direct compensation is selected as the phase difference compensation algorithm, the sampling point interval of each channel is corrected and adjusted to the historical sampling point interval. If time delay adjustment is selected as the phase difference compensation algorithm, the first channel voltage is used as a reference, a reference signal with a phase difference of zero is applied to each channel, the phase difference of each channel is collected, and the phase difference is converted into a phase time difference before phase compensation. The specific steps are as follows:

[0071] Determine the delay amount: Calculate the phase time difference based on the phase difference of each channel and the power frequency period of the reference signal using the time delay conversion formula: Where Δt is the phase time difference, is the phase difference, T is the power frequency period of the reference signal;

[0072] Calculate the channel sampling point interval difference: take the ratio of the phase time difference of each channel to the sampling point interval as the sampling point interval difference of each channel;

[0073] Adjust sampling points: When the sampling point interval difference is a positive number, the sampling point interval difference is taken to adjust the corresponding sampling point backward; when the sampling point interval difference is a negative number, the absolute value of the sampling point interval difference is taken to adjust the corresponding sampling point forward.

[0074] It should be noted that the phase difference is a numerical value describing the time difference between two periodic signals, reflecting the relative position of the signal waveform within a period. The detection of the phase difference is a prior art method and will not be analyzed here.

[0075] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by software, the above embodiments may be implemented in whole or in part in the form of a computer program product.

[0076] Those of ordinary skill in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application of the technical solution and the invention constraints. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0077] In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0078] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0079] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A phase compensation method for a multifunctional electric power digital display instrument, characterized in that: The following steps are included: Step S1: before performing a function test on the multifunctional electric power digital display meter, obtaining a normal power frequency cycle of a reference signal, and performing a power frequency locking experiment according to the normal power frequency cycle; Step S2: determining the power frequency of the reference signal through a power frequency locking experiment, calculating the power frequency period according to the power frequency of the reference signal, determining the total number of sampling points according to a preset number of oversampling times, and calculating the sampling point interval based on the total number of sampling points and the power frequency period of the reference signal; Step S3: Acquire historical data, calculate sampling point interval difference by integrating historical data and sampling point interval, detect channel noise, and select direct compensation or time delay adjustment by integrating sampling point interval difference and channel noise between channels; Step S4: When time delay adjustment is selected, the first channel voltage is used as a reference, a reference signal with a phase difference of zero is applied to each channel, the phase difference of each channel is collected, the phase difference is converted into a phase time difference, and phase compensation is completed according to the phase time difference.

2. The phase compensation method of a multifunctional electric power digital display instrument according to claim 1 is characterized in that: In step S1, the conventional power frequency cycle refers to the AC power frequency range used in the power system; after obtaining the conventional power frequency cycle, the conventional power frequency cycle is divided according to the preset power frequency selection interval, and the power frequencies corresponding to the values ​​of the multiple interval points obtained by the division are used as the experimental power frequencies of the power frequency locking experiment.

3. The phase compensation method of a multifunctional electric power digital display instrument according to claim 2 is characterized in that: In step S1, when performing the power frequency locking experiment, the voltage measurement circuit inside the three-phase multifunctional digital display instrument is connected, and the reference signals of multiple experimental power frequencies are sequentially transmitted to the voltage measurement circuit, and the three-phase multifunctional digital display instrument is connected to the spectrum analyzer and the oscilloscope to respectively detect the interference electromagnetic and voltage fluctuations of the corresponding power frequency reference signal; A spectrum analyzer is an instrument used to measure and display the spectrum of a signal. It is used to measure the electromagnetic interference when a reference signal is transmitted into a voltage measurement circuit. An oscilloscope is an electronic measuring instrument used to observe and analyze the waveform of electrical signals, graphically displaying the changes in voltage signals over time to obtain voltage fluctuations.

4. The phase compensation method of a multifunctional electric power digital display instrument according to claim 3 is characterized in that: In step S2, the interference electromagnetic and voltage fluctuations when each power frequency reference signal is transmitted to the voltage measurement circuit are used to calculate the power frequency coefficient when the reference signal of different power frequencies is transmitted to the voltage measurement circuit using the geometric mean method. The calculation formula of the geometric mean method is: Among them, g is the power frequency coefficient, c is the electromagnetic interference when the reference signal corresponding to the power frequency is transmitted to the voltage measurement circuit, and d is the voltage fluctuation when the reference signal corresponding to the power frequency is transmitted to the voltage measurement circuit; The power frequency corresponding to the minimum value of the power frequency coefficient is used as the power frequency of the reference signal, a period of time is selected as the calculation period, and the ratio of the power frequency of the reference signal to the calculation period is used as the power frequency period of the reference signal.

5. The phase compensation method of a multifunctional electric power digital display instrument according to claim 4 is characterized in that: In step S2, the specific steps for calculating the sampling point interval are as follows: Set the number of basic sampling points: Set the number of basic sampling points in a complete power frequency cycle to N; Set the number of oversampling times: Set the number of oversampling times OSMPN; Calculate the total number of sampling points: take the product of the basic sampling points and the number of oversampling times as the total number of sampling points; After the total number of sampling points is calculated, the sampling points are evenly distributed within the power frequency period of the sampling signal, and the ratio of the power frequency period of the reference signal to the total number of sampling points is used as the sampling point interval.

6. The phase compensation method of a multifunctional electric power digital display instrument according to claim 1, characterized in that: In step S3, the historical data is the acquired historical sampling point intervals, and the sampling point interval of each sampling point is subtracted from the historical sampling point interval to obtain the sampling point interval difference.

7. The phase compensation method of a multifunctional electric power digital display instrument according to claim 1, characterized in that: In step S3, the sampling point interval difference between each channel and the channel noise are comprehensively considered to select direct compensation or time delay adjustment by using fuzzy reasoning. The steps are as follows: The sampling point interval difference of each channel and the channel noise are used as input variables; The phase difference compensation algorithm is defined as an output variable; Set fuzzy rules to describe the impact of different input variables on output variables; Select direct compensation or time delay adjustment based on the output result.

8. The phase compensation method of a multifunctional electric power digital display instrument according to claim 6 is characterized in that: In step S4, if direct compensation is selected as the phase difference compensation algorithm, the sampling point interval of the sampling points of each channel is corrected and adjusted to the historical sampling point interval. If time delay adjustment is selected as the phase difference compensation algorithm, the first channel voltage is used as a reference, a reference signal with a phase difference of zero is applied to each channel, the phase difference of each channel is collected, and the phase difference is converted into a phase time difference before phase compensation.

9. The phase compensation method of a multifunctional electric power digital display instrument according to claim 8, characterized in that: In step S4: using time delay adjustment to perform phase compensation, the specific steps are as follows: Determine the delay amount: Calculate the phase time difference based on the phase difference of each channel and the power frequency period of the reference signal using the time delay conversion formula: Where Δt is the phase time difference, is the phase difference, T is the power frequency period of the reference signal; Calculate the channel sampling point interval difference: take the ratio of the phase time difference of each channel to the sampling point interval as the sampling point interval difference of each channel; Adjust the sampling points: When the sampling point interval difference is a positive number, the sampling point interval difference is taken to adjust the corresponding sampling point backward; when the sampling point interval difference is a negative number, the absolute value of the sampling point interval difference is taken to adjust the corresponding sampling point forward.

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