Correction system and method for power frequency waveform distortion of potential indicator

Abstract

The invention provides a correction system and method for power frequency waveform distortion of a potential indicator, and the system comprises a waveform collection unit which is used for carrying out the real-time collection of a waveform signal outputted by the potential indicator through a preset sensor; the waveform analysis module is used for carrying out spectrum analysis and waveform overall form analysis on the collected signals, determining the component, amplitude and frequency of harmonic waves and determining the characteristic change of the waveform; the correction processing module is used for determining a corresponding waveform distortion feature according to the waveform feature change and calling a corresponding correction strategy to correct the waveform; the correction strategy at least comprises harmonic elimination and waveform reconstruction; and the nuclear phase module is used for performing nuclear phase operation by using the corrected waveform, and obtaining an accurate nuclear phase result through a preset phase comparison algorithm. According to the invention, the problem of inaccurate nuclear phase data caused by waveform distortion of the potential indicator is effectively solved, and the accuracy and reliability of nuclear phase operation of a power system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of power system automation, and in particular to a correction system and method for power frequency waveform distortion of a live indicator. Background Art

[0002] With the development of automated operation of power grids, automated remote unmanned monitoring phase checking system is a crucial issue in power systems. It does not require personnel to arrive at the site, and the on-site phase checking data can be monitored in real time at the background remote terminal to ensure the phase consistency of different power supplies or electrical equipment before parallel operation. However, during the phase checking process, the high-resistance induction voltage of the live indicator is too low, and the induction current is too small. Specifically, there are the following problems: the induction current of some switch cabinets cannot drive the live indicator light to flash, and capacitors are required to buffer and store electricity, and the indicator light can be lit when it is discharged regularly. In this case, the waveform / frequency of the output signal of the live indicator hole is distorted, and the initial phase angle will also change. This problem directly leads to inaccurate phase checking data. Such switch cabinets cannot accurately complete the phase checking work, which brings more uncertainty to the safe and stable operation of the power system. Summary of the invention

[0003] The purpose of the present invention is to provide a system and method for correcting the distortion of the power frequency waveform of a live indicator, so as to solve the technical problem of how to accurately check the phase of the live indicator.

[0004] On the one hand, a correction system for power frequency waveform distortion of a live indicator is provided, comprising:

[0005] A waveform acquisition unit, used to acquire the waveform signal output by the power indicator in real time through a preset sensor;

[0006] The waveform analysis module is used to perform spectrum analysis and overall waveform morphology analysis on the collected signal, determine the components, amplitude and frequency of the harmonics and determine the characteristic changes of the waveform;

[0007] A correction processing module, used to determine the corresponding waveform distortion characteristics according to the waveform characteristic changes, and to call the corresponding correction strategy to correct the waveform; the correction strategy at least includes harmonic elimination and waveform reconstruction;

[0008] The phase comparison module uses the corrected waveform to perform phase comparison operations and obtains accurate phase comparison results through a preset phase comparison algorithm.

[0009] Preferably, the waveform analysis module at least includes:

[0010] The spectrum analysis submodule is used to perform spectrum analysis on the collected signal through a preset spectrum analysis algorithm to detect the components, amplitude and frequency of harmonics;

[0011] The waveform morphology analysis submodule is used to analyze the overall morphology of the waveform through a preset waveform recognition algorithm to obtain the corresponding waveform characteristics; the waveform characteristics at least include peaks, valleys, rising edges, and falling edges.

[0012] Preferably, the harmonic elimination is to delete the waveform of the load preset frequency in the waveform distortion characteristics through a preset filter and its built-in harmonic elimination algorithm.

[0013] Preferably, the waveform reconstruction is to reconstruct the waveform distortion characteristics through a preset ideal waveform model to obtain a corresponding reconstructed waveform; the ideal waveform model is a preset mathematical model and a waveform reconstruction algorithm set therein.

[0014] Preferably, the waveform analysis module is further used to convert the waveform signal from the time domain to the frequency domain through a preset fast Fourier transform, and determine the distribution of harmonics according to the frequency domain.

[0015] Preferably, the waveform analysis module is also used to identify geometric features of the waveform signal and determine the changing rules of the waveform according to the identified geometric features.

[0016] On the other hand, a method for correcting the distortion of the power frequency waveform of a live indicator is also provided, which is implemented by the system for correcting the distortion of the power frequency waveform of a live indicator, comprising:

[0017] Real-time acquisition of waveform signals output by the live indicator;

[0018] Perform spectrum analysis and overall waveform morphology analysis on the acquired signal to determine the harmonic components, amplitude and frequency and determine the characteristic changes of the waveform;

[0019] Determine the corresponding waveform distortion characteristics according to the waveform characteristic changes, and call the corresponding correction strategy to correct the waveform; the correction strategy at least includes harmonic elimination and waveform reconstruction;

[0020] The corrected waveform is used to perform the phase kernel operation, and an accurate phase kernel result is obtained through a precise phase comparison algorithm.

[0021] Preferably, the method further includes deleting the waveform of the load preset frequency in the waveform distortion feature through a preset filter and a built-in harmonic elimination algorithm.

[0022] Preferably, it also includes reconstructing the waveform distortion characteristics through a preset ideal waveform model to obtain a corresponding reconstructed waveform; the ideal waveform model is a preset mathematical model and a waveform reconstruction algorithm set therein.

[0023] Preferably, it also includes converting the waveform signal from the time domain to the frequency domain through a preset fast Fourier transform, and determining the distribution of harmonics based on the frequency domain; and identifying the geometric features of the waveform signal, and determining the change law of the waveform based on the identified geometric features.

[0024] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0025] The correction system and method for the distortion of the power frequency waveform of the live indicator provided by the present invention effectively solve the problem of inaccurate phase verification data caused by the distortion of the live indicator waveform through accurate correction of the waveform, improve the accuracy and reliability of the phase verification operation of the power system, reduce power accidents caused by phase verification errors, and ensure the safe and stable operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0027] Figure 1 The figure is a schematic diagram of a system for correcting power frequency waveform distortion of a power indicator according to an embodiment of the present invention.

[0028] Figure 2 Schematic diagram of a waveform acquisition unit in an embodiment of the present invention.

[0029] Figure 3 Schematic diagram of a waveform analysis module in an embodiment of the present invention.

[0030] Figure 4 It is a schematic diagram of a correction processing module in an embodiment of the present invention.

[0031] Figure 5 Schematic diagram of an AD conversion circuit in an embodiment of the present invention.

[0032] Figure 6 The main flow diagram of a method for correcting power frequency waveform distortion of a live indicator in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] like Figure 1FIG. 1 is a schematic diagram of an embodiment of a system for correcting power frequency waveform distortion of a power indicator provided by the present invention. In this embodiment, the system comprises:

[0035] The waveform acquisition unit is used to collect the waveform signal output by the power indicator in real time through a preset sensor; the waveform analysis module is used to perform spectrum analysis and overall waveform morphology analysis on the collected signal to determine the harmonic components, amplitude and frequency and determine the characteristic changes of the waveform; the correction processing module is used to determine the corresponding waveform distortion characteristics according to the waveform characteristic changes, and call the corresponding correction strategy to correct the waveform; the correction strategy at least includes harmonic elimination and waveform reconstruction; the core phase module: uses the corrected waveform to perform core phase operation, and obtains accurate core phase results through a preset phase comparison algorithm. It can be understood that the waveform acquisition unit, such as Figure 2 As shown in the figure, a high-precision sensor is used to collect the waveform signal output by the live indicator in real time to ensure that the collected signal can truly reflect the characteristics of the original waveform. Figure 3 As shown in the figure, the spectrum analysis submodule uses advanced algorithms to perform spectrum analysis on the collected signals, which can accurately detect the components, amplitudes and frequencies of harmonics. The waveform morphology analysis submodule conducts a detailed analysis of the overall morphology of the waveform, including the changes in the peaks, valleys, rising edges, falling edges and other features. The correction processing module, such as Figure 4 As shown in the figure, a variety of correction methods are used for the analyzed waveform distortion characteristics. The harmonic elimination method of the filter can effectively remove the harmonic components of a specific frequency, while the waveform reconstruction method based on the mathematical model can reconstruct the distorted waveform according to the model of the ideal waveform. Nuclear phase module: Use the corrected waveform to perform nuclear phase operation, and obtain accurate nuclear phase results through precise phase comparison algorithm. Figure 5 As shown, an AD conversion circuit is also included for converting the form of the waveform signal.

[0036] In one embodiment, the waveform analysis module at least includes: a spectrum analysis submodule, which is used to perform spectrum analysis on the collected signal through a preset spectrum analysis algorithm to detect the harmonic components, amplitude and frequency; a waveform morphology analysis submodule, which is used to analyze the overall morphology of the waveform through a preset waveform recognition algorithm to obtain the corresponding waveform characteristics; the waveform characteristics at least include peaks, valleys, rising edges, and falling edges. Among them, the harmonic elimination is to delete the waveform of the preset load frequency in the waveform distortion characteristics through a preset filter and its built-in harmonic elimination algorithm. The waveform reconstruction is to reconstruct the waveform distortion characteristics through a preset ideal waveform model to obtain the corresponding reconstructed waveform; the ideal waveform model is a preset mathematical model and the waveform reconstruction algorithm set therein.

[0037] In one embodiment, the waveform analysis module is also used to convert the waveform signal from the time domain to the frequency domain through a preset fast Fourier transform, and determine the distribution of harmonics based on the frequency domain. The waveform analysis module is also used to identify the geometric features of the waveform signal, and determine the change law of the waveform based on the identified geometric features. It is understandable that the waveform acquisition unit is used to collect the original waveform signal output by the power indicator. The original waveform signal is comprehensively analyzed by the waveform analysis module. Spectral analysis converts the signal from the time domain to the frequency domain through fast Fourier transform, and clearly shows the distribution of harmonics. Waveform morphology analysis starts with the geometric features of the waveform and analyzes the change law of its shape.

[0038] like Figure 6 As shown, an embodiment of the present invention further provides a method for correcting the distortion of the power frequency waveform of a live indicator, which is implemented by the system for correcting the distortion of the power frequency waveform of a live indicator, comprising:

[0039] Step S1, real-time acquisition of the waveform signal output by the charged indicator;

[0040] Step S2, performing spectrum analysis and overall waveform analysis on the collected signal to determine the components, amplitude and frequency of the harmonics and determine characteristic changes of the waveform;

[0041] Step S3, determining the corresponding waveform distortion characteristics according to the waveform characteristic changes, and calling the corresponding correction strategy to correct the waveform; the correction strategy at least includes harmonic elimination and waveform reconstruction;

[0042] Step S4, using the corrected waveform to perform a phase kernel operation, and obtaining an accurate phase kernel result through a precise phase comparison algorithm.

[0043] The method also includes deleting the waveform of the load preset frequency in the waveform distortion characteristics through a preset filter and its built-in harmonic elimination algorithm.

[0044] It also includes reconstructing the waveform distortion characteristics through a preset ideal waveform model to obtain a corresponding reconstructed waveform; the ideal waveform model is a preset mathematical model and a waveform reconstruction algorithm set therein.

[0045] It also includes converting the waveform signal from the time domain to the frequency domain through a preset fast Fourier transform, and determining the distribution of harmonics based on the frequency domain; and identifying the geometric features of the waveform signal, and determining the change law of the waveform based on the identified geometric features.

[0046] It should be noted that the method described in the above embodiment corresponds to the system described in the above embodiment. Therefore, the part of the method described in the above embodiment that is not described in detail can be obtained by referring to the content of the system described in the above embodiment, and will not be repeated here.

[0047] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0048] The correction system and method for the distortion of the power frequency waveform of the live indicator provided by the present invention effectively solve the problem of inaccurate phase verification data caused by the distortion of the live indicator waveform through accurate correction of the waveform, improve the accuracy and reliability of the phase verification operation of the power system, reduce power accidents caused by phase verification errors, and ensure the safe and stable operation of the power system.

[0049] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A correction system for power frequency waveform distortion of a live indicator, characterized in that: include: A waveform acquisition unit, used to acquire the waveform signal output by the power indicator in real time through a preset sensor; The waveform analysis module is used to perform spectrum analysis and overall waveform morphology analysis on the collected signal, determine the components, amplitude and frequency of the harmonics and determine the characteristic changes of the waveform; A correction processing module, used to determine the corresponding waveform distortion characteristics according to the waveform characteristic changes, and to call the corresponding correction strategy to correct the waveform; the correction strategy at least includes harmonic elimination and waveform reconstruction; The phase comparison module uses the corrected waveform to perform phase comparison operations and obtains accurate phase comparison results through a preset phase comparison algorithm.

2. The correction system according to claim 1, characterized in that The waveform analysis module at least includes: The spectrum analysis submodule is used to perform spectrum analysis on the collected signal through a preset spectrum analysis algorithm to detect the components, amplitude and frequency of harmonics; The waveform morphology analysis submodule is used to analyze the overall morphology of the waveform through a preset waveform recognition algorithm to obtain the corresponding waveform characteristics; the waveform characteristics at least include peaks, valleys, rising edges, and falling edges.

3. The correction system according to claim 2, characterized in that The harmonic elimination is to delete the waveform of the load preset frequency in the waveform distortion characteristics through a preset filter and its built-in harmonic elimination algorithm.

4. The correction system according to claim 3, characterized in that The waveform reconstruction is to reconstruct the waveform distortion characteristics through a preset ideal waveform model to obtain a corresponding reconstructed waveform; the ideal waveform model is a preset mathematical model and the waveform reconstruction algorithm set therein.

5. The correction system according to claim 4, characterized in that The waveform analysis module is also used to convert the waveform signal from the time domain to the frequency domain through a preset fast Fourier transform, and determine the distribution of harmonics according to the frequency domain.

6. The correction system according to claim 5, characterized in that The waveform analysis module is also used to identify the geometric features of the waveform signal and determine the changing rules of the waveform according to the identified geometric features.

7. A method for correcting power frequency waveform distortion of a live indicator, implemented by a system as claimed in any one of claims 1 to 6, characterized in that: include, Real-time acquisition of waveform signals output by the live indicator; Perform spectrum analysis and overall waveform morphology analysis on the collected signals to determine the components, amplitudes and frequencies of harmonics and determine characteristic changes in the waveforms; Determine the corresponding waveform distortion characteristics according to the waveform characteristic changes, and call the corresponding correction strategy to correct the waveform; the correction strategy at least includes harmonic elimination and waveform reconstruction; The corrected waveform is used to perform the phase kernel operation, and an accurate phase kernel result is obtained through a precise phase comparison algorithm.

8. The method according to claim 7, characterized in that The method also includes deleting the waveform of the load preset frequency in the waveform distortion characteristics through a preset filter and its built-in harmonic elimination algorithm.

9. The method according to claim 8, characterized in that It also includes reconstructing the waveform distortion characteristics through a preset ideal waveform model to obtain a corresponding reconstructed waveform; the ideal waveform model is a preset mathematical model and a waveform reconstruction algorithm set therein.

10. The method according to claim 9, characterized in that The method further includes converting the waveform signal from the time domain to the frequency domain by a preset fast Fourier transform, and determining the distribution of harmonics according to the frequency domain; and Identify the geometric features of the waveform signal and determine the changing rules of the waveform based on the identified geometric features.

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