A correction system and method for power frequency waveform distortion of live indicator

Abstract

The application provides a correction system and method for power frequency waveform distortion of a live indicator, comprising a waveform acquisition unit for collecting waveform signals output by the live indicator in real time through a preset sensor; a waveform analysis module for performing frequency spectrum analysis and overall form analysis on the collected signals, determining the composition, amplitude and frequency of harmonics and determining the characteristic change of the waveform; a correction processing module for determining the corresponding waveform distortion characteristics according to the characteristic change of the waveform, calling the corresponding correction strategy to correct the waveform; the correction strategy at least includes harmonic elimination and waveform reconstruction; and a phase comparison module for performing phase comparison operation by using the corrected waveform, and obtaining accurate phase comparison results through a preset phase comparison algorithm. The application effectively solves the problem of inaccurate phase comparison data caused by waveform distortion of the live indicator, and improves the accuracy and reliability of phase comparison operation of the power system.

Description

TECHNICAL FIELD

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

[0002] With the development of power grid automation operation, in the power system, the automatic remote unmanned phase checking system is a crucial issue, which can monitor the on-site phase checking data in real time through the background remote terminal without personnel on site, and ensure the consistency of the phase of different power sources or electrical equipment before parallel operation. However, in the process of phase checking, the high resistance induced voltage of the live indicator is too low, and the induced current is too small, which has the following problems: the induced current of part of the switch cabinet cannot drive the live indicator to flash, and the capacitor needs to be buffered to store electricity, and the indicator light can only be lit by periodic discharge. In this case, the waveform / frequency of the output signal of the live indicator hole is distorted, and the initial phase angle also changes. This problem directly leads to inaccurate phase checking data, and 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

[0003] The purpose of the present application is to provide a correction system and method for power frequency waveform distortion of a live indicator, which solves the technical problem of how to accurately phase check 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 is configured to acquire waveform signals output by the live indicator in real time through a preset sensor;

[0006] A waveform analysis module is configured to perform frequency spectrum analysis and overall form analysis on the acquired signals, determine the composition, amplitude and frequency of harmonics, and determine the characteristic changes of the waveform;

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

[0008] A phase checking module is configured to perform phase checking operation using the corrected waveform, and obtain accurate phase checking results through a preset phase comparison algorithm.

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

[0010] A frequency spectrum analysis submodule is configured to perform frequency spectrum analysis on the acquired signals through a preset frequency spectrum analysis algorithm, and detect the composition, amplitude and frequency of harmonics;

[0011] The waveform form analysis submodule is configured to analyze the overall form of the waveform by a preset waveform recognition algorithm to obtain corresponding waveform features; the waveform features at least include a peak, a valley, a rising edge, and a falling edge.

[0012] Preferably, the harmonic elimination is performed by a preset filter and a built-in harmonic elimination algorithm to delete the waveform of the preset frequency of the load from the waveform distortion features.

[0013] Preferably, the waveform reconstruction is performed by a preset ideal waveform model to reconstruct the waveform distortion features to obtain corresponding reconstructed waveforms; the ideal waveform model is a preset mathematical model and a built-in waveform reconstruction algorithm.

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

[0015] Preferably, the waveform analysis module is further configured to identify the geometric features of the waveform signal, and determine the variation law of the waveform according to the identified geometric features.

[0016] In another aspect, a method for correcting the power frequency waveform distortion of a live indicator is also provided, which is implemented by the system for correcting the power frequency waveform distortion of a live indicator, and includes,

[0017] Real-time collection of the waveform signal output by the live indicator is performed;

[0018] Spectrum analysis and overall form analysis of the collected signal are performed to determine the components, amplitudes, and frequencies of harmonics and determine the variation of the waveform features;

[0019] According to the variation of the waveform features, corresponding waveform distortion features are determined, and a corresponding correction strategy is called to correct the waveform; the correction strategy at least includes harmonic elimination and waveform reconstruction.

[0020] The corrected waveform is used for phase comparison operation, and an accurate phase comparison algorithm is used to obtain an accurate phase comparison result.

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

[0022] Preferably, the method further includes reconstructing the waveform distortion features by a preset ideal waveform model to obtain corresponding reconstructed waveforms; the ideal waveform model is a preset mathematical model and a built-in waveform reconstruction algorithm.

[0023] Preferably, the method further comprises: converting the waveform signal from time domain to frequency domain by preset fast Fourier transform, and determining the distribution of the harmonics according to the frequency domain; and identifying the geometric features of the waveform signal, and determining the variation law of the waveform according to the identified geometric features.

[0024] In summary, the embodiment of the present application has the following beneficial effects:

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

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0027] Figure 1 FIG. 1 is a schematic diagram of a correction system for power frequency waveform distortion of a live indicator in an embodiment of the present application.

[0028] Figure 2 FIG. 2 is a schematic diagram of a waveform acquisition unit in an embodiment of the present application.

[0029] Figure 3 FIG. 3 is a schematic diagram of a waveform analysis module in an embodiment of the present application.

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

[0031] Figure 5 FIG. 5 is a schematic diagram of an AD conversion circuit in an embodiment of the present application.

[0032] Figure 6 FIG. 6 is a main flowchart of a correction method for power frequency waveform distortion of a live indicator in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings.

[0034] As Figure 1As shown, it is a schematic diagram of an embodiment of the correction system for power frequency waveform distortion of live indicator provided by the application. In this embodiment, it comprises:

[0035] The waveform acquisition unit is used for real-time acquisition of the waveform signal output by the live indicator through the preset sensor. The waveform analysis module is used for frequency spectrum analysis and overall form analysis of the collected signal, to determine the harmonic component, amplitude and frequency and determine the characteristic change of the waveform. The correction processing module is used for determining the corresponding waveform distortion feature according to the waveform characteristic change, and calling 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 operation, and obtains accurate phase comparison result through the preset phase comparison algorithm. As shown, the waveform acquisition unit, such as Figure 2 uses high-precision sensor 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. The waveform analysis module, such as Figure 3 The frequency spectrum analysis submodule uses advanced algorithms to perform frequency spectrum analysis on the collected signal, which can accurately detect the harmonic component, amplitude and frequency. The waveform form analysis submodule carefully analyzes the overall form of the waveform, including the change of the characteristics such as peak, valley, rising edge and falling edge. The correction processing module, such as Figure 4 uses multiple correction methods for the analyzed waveform distortion feature. The harmonic elimination method of the filter can effectively remove the harmonic component of a specific frequency, and the waveform reconstruction method based on the mathematical model can reconstruct the distorted waveform according to the model of the ideal waveform. The phase comparison module: uses the corrected waveform to perform phase comparison operation, and obtains accurate phase comparison result through the accurate phase comparison algorithm. As shown, Figure 5 It also includes an AD conversion circuit for form conversion of the waveform signal.

[0036] In one embodiment, the waveform analysis module at least includes a frequency spectrum analysis submodule for performing frequency spectrum analysis on the collected signal through a preset frequency spectrum analysis algorithm to detect the harmonic component, amplitude and frequency; and a waveform form analysis submodule for analyzing the overall form of the waveform through a preset waveform recognition algorithm to obtain the corresponding waveform characteristics; the waveform characteristics at least include peak, valley, rising edge and falling edge. The harmonic elimination is to delete the waveform of the preset frequency of the load in the waveform distortion feature through a preset filter and its built-in harmonic elimination algorithm. The waveform reconstruction is to reconstruct the waveform distortion feature through a preset ideal waveform model to obtain the corresponding reconstructed waveform; the ideal waveform model is a preset mathematical model and its built-in waveform reconstruction algorithm.

[0037] In one embodiment, the waveform analysis module is further configured to convert the waveform signal from time domain to frequency domain by preset fast Fourier transform, and determine the distribution of harmonics according to the frequency domain. The waveform analysis module is further configured to identify the geometric features of the waveform signal, and determine the variation law of the waveform according to the identified geometric features. It can be understood that the original waveform signal output by the live-line indicator is collected by the waveform collection unit. The original waveform signal is comprehensively analyzed by the waveform analysis module. The spectrum analysis converts the signal from time domain to frequency domain by fast Fourier transform, and clearly shows the distribution of harmonics. The waveform morphology analysis starts from the geometric features of the waveform, and analyzes the variation law of the shape.

[0038] As shown in Figure 6 The embodiment of the present application also provides a correction method for power frequency waveform distortion of a live-line indicator, which is realized by the correction system for power frequency waveform distortion of a live-line indicator, and comprises the following steps.

[0039] Step S1: collecting the waveform signal output by the live-line indicator in real time;

[0040] Step S2: performing spectrum analysis and overall morphology analysis on the collected signal, determining the components, amplitudes and frequencies of harmonics, and determining the characteristic variation of the waveform;

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

[0042] Step S4: performing phase comparison operation by using the corrected waveform, and obtaining accurate phase comparison results by using an accurate phase comparison algorithm.

[0043] Further comprising: deleting the waveform of the preset frequency of the load in the waveform distortion characteristics by using a preset filter and a built-in harmonic elimination algorithm.

[0044] Further comprising: reconstructing the waveform distortion characteristics by using a preset ideal waveform model to obtain the corresponding reconstructed waveform; the ideal waveform model is a preset mathematical model and a built-in waveform reconstruction algorithm.

[0045] Further comprising: converting the waveform signal from time domain to frequency domain by preset fast Fourier transform, and determining the distribution of harmonics according to the frequency domain; and identifying the geometric features of the waveform signal, and determining the variation law of the waveform according to 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, and therefore, the parts not described in detail in the method described in the above embodiment can be obtained by referring to the content of the system described in the above embodiment, which will not be described here.

[0047] In summary, the embodiment of the present application has the following beneficial effects:

[0048] The correction system and method for power frequency waveform distortion of the charged indicator provided by the present application effectively solves the problem of inaccurate phase data caused by waveform distortion of the charged indicator through accurate correction of the waveform, improves the accuracy and reliability of the power system phase operation, reduces power accidents caused by phase errors, and ensures the safe and stable operation of the power system.

[0049] The above disclosure is only the preferred embodiment of the present application, and of course cannot limit the scope of the right of the present application, so the equivalent changes made according to the claims of the present application still belong to the scope covered by the present application.

Claims

1. A correction system for power frequency waveform distortion of a live indicator, characterized by, Comprising: Waveform acquisition unit, for collecting the waveform signal output by the live line indicator in real time through a preset sensor; Waveform analysis module, for performing frequency spectrum analysis and overall waveform morphology analysis on the collected signal, determining the harmonic components, amplitudes and frequencies and determining the characteristic changes of the waveform; Correction processing module, for 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, waveform reconstruction; Phase comparison module, for performing phase comparison operation using the corrected waveform, and obtaining accurate phase comparison results through a preset phase comparison algorithm.

2. The correction system of claim 1, wherein, The waveform analysis module at least includes, Frequency spectrum analysis submodule, for performing frequency spectrum analysis on the collected signal through a preset frequency spectrum analysis algorithm, detecting the harmonic components, amplitudes and frequencies; Waveform morphology analysis submodule, for analyzing the overall morphology of the waveform through a preset waveform recognition algorithm, and obtaining the corresponding waveform characteristics; the waveform characteristics at least include peak, valley, rising edge and falling edge.

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

4. The correction system of claim 3, wherein, The waveform reconstruction is to reconstruct the waveform distortion characteristics through a preset ideal waveform model, and obtain the corresponding reconstructed waveform; the ideal waveform model is a preset mathematical model and its built-in waveform reconstruction algorithm.

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

6. The correction system of claim 5, wherein, The waveform analysis module is also used to identify the geometric characteristics of the waveform signal, and determine the change law of the waveform according to the identified geometric characteristics.

7. A method for correction of power frequency waveform distortion of a live indicator, implemented by means of a system according to any one of claims 1-6, characterized in that, Comprising, Collecting the waveform signal output by the live line indicator in real time; Performing frequency spectrum analysis and overall waveform morphology analysis on the collected signal, determining the harmonic components, amplitudes and frequencies and determining the characteristic changes of the waveform; 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, waveform reconstruction; Performing phase comparison operation using the corrected waveform, and obtaining accurate phase comparison results through a precise phase comparison algorithm.

8. The method of claim 7, wherein, Also including, deleting the waveform of the preset frequency of the load in the waveform distortion characteristics through a preset filter and its built-in harmonic elimination algorithm.

9. The method of claim 8, wherein, Also including, reconstructing the waveform distortion characteristics through a preset ideal waveform model, and obtaining the corresponding reconstructed waveform; the ideal waveform model is a preset mathematical model and its built-in waveform reconstruction algorithm.

10. The method of claim 9, wherein, Also including, converting the waveform signal from time domain to frequency domain through a preset fast Fourier transform, and determining the harmonic distribution according to the frequency domain; and Identifying the geometric characteristics of the waveform signal, and determining the change law of the waveform according to the identified geometric characteristics.

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