CN115754832A - Method and device for eliminating transient noise of transformer winding oscillatory wave high-voltage switch - Google Patents
Method and device for eliminating transient noise of transformer winding oscillatory wave high-voltage switch Download PDFInfo
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Abstract
The invention relates to a method and a device for eliminating transient noise of a transformer winding oscillatory wave high-voltage switch, wherein the method comprises the steps of collecting oscillatory waves according to the on-off period of a direct-current high-voltage switch and intercepting the oscillatory wave waveforms into a plurality of independent oscillatory wave waveforms; the waveform of the single oscillation wave corresponds to the separation and combination period; extracting frequency domain components according to the single oscillatory wave waveform, and determining a transient noise signal according to the frequency domain components; judging whether the transient noise signal of each switching-on and switching-off period has abnormal noise data or not, and if so, removing the transient noise signal of the switching-on and switching-off period; and integrating the transient noise signals of the rest of the switching cycles to obtain a new oscillation wave signal. The method processes the transient noise signal caused by the high-voltage switch in the oscillatory wave detection, so that the frequency, peak value and other key parameters of the oscillatory wave data obtained after abnormal noise is removed are more accurate, and the problem of misjudgment of the winding state in the denoising process is solved.
Description
Technical Field
The invention belongs to the technical field of electrical equipment, and particularly relates to a method and a device for eliminating transient noise of a transformer winding oscillatory wave high-voltage switch.
Background
When a winding deformation oscillatory wave test is carried out on a transformer, because the direct-current high-voltage switch is switched on and off according to a certain frequency, transient noise interference can be caused when the direct-current high-voltage switch is switched on and off every time, and the switching on and off of the switch is the starting of an oscillatory wave signal every time, which can cause a section of disordered noise interference at the starting position of each oscillatory wave signal.
In the related art, the existing transformer winding oscillating wave test and signal processing methods both process the noise, but the processing mode can affect the frequency, peak value and other key parameters of the oscillating wave data, and cause the misjudgment of the winding state.
Disclosure of Invention
In view of the above, the present invention provides a method and a device for eliminating transient noise of a transformer winding oscillatory wave high-voltage switch, so as to solve the problem of erroneous judgment of a winding state caused by noise interference generated by a high-voltage switch being periodically switched on and off in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a transient noise elimination method for a transformer winding oscillating wave high-voltage switch comprises the following steps:
collecting oscillation waves according to the on-off period of the direct-current high-voltage switch, and intercepting the oscillation wave waveforms into a plurality of independent oscillation wave waveforms; the single oscillating wave waveform corresponds to the separation and combination period;
extracting frequency domain components according to the single oscillatory wave waveform, and determining a transient noise signal according to the frequency domain components;
judging whether the transient noise signal of each switching-on and switching-off period has abnormal noise data, and if so, removing the transient noise signal of the switching-on and switching-off period;
and integrating the transient noise signals of the rest of the switching cycles to obtain a new oscillation wave signal.
Furthermore, the oscillation wave waveform is intercepted into a plurality of independent oscillation wave waveforms according to the dividing and combining period.
Further, the extracting frequency domain components from the individual oscillatory wave waveforms includes:
carrying out fast Fourier transform on each single oscillation wave waveform to obtain a frequency spectrum of each oscillation wave waveform;
and taking the maximum amplitude on the frequency spectrum as an oscillation wave frequency domain component.
Further, determining a transient noise signal from the frequency domain components includes:
and when the amplitude of the frequency domain component is lower than the amplitude of the oscillation wave, the frequency is within a preset multiple range of the frequency of the oscillation wave, and the amplitude of the frequency domain component is close to the frequency, determining that the frequency domain component is a transient noise signal.
Further, the determining whether the transient noise signal of each switching-on/off cycle has abnormal noise data includes:
counting the frequency and amplitude of the transient noise signal of each split-combined period, and calculating the average frequency and average amplitude;
calculating the difference between the frequency and the amplitude of the transient noise signal of each split-combined period and the average frequency and the average amplitude;
and when the difference value between the frequency of the transient noise signal in the switching-on and switching-off period and the average frequency is larger than a first preset value, and/or the difference value between the amplitude of the transient noise signal in the switching-on and switching-off period and the average amplitude is larger than a second preset value, determining that abnormal noise data exists in the transient noise signal in the switching-on and switching-off period.
Further, the integrating the transient noise signal of the remaining switching-on/off period to obtain a new oscillation wave signal includes:
white noise is adopted to replace the removed transient noise signal of the switching-on and switching-off period;
then integrating the transient noise signals of all the switching cycles to obtain oscillation wave frequency domain signals with noise removed;
and carrying out fast Fourier inverse change on the oscillation wave frequency domain signal subjected to the noise removal to obtain an oscillation wave signal subjected to the transient noise removal.
Further, the preset multiple range is 2-5 times.
Further, when the difference between the frequency of the transient noise signal in the switching-on/off period and the average frequency is greater than 15%, and/or the difference between the amplitude of the transient noise signal in the switching-on/off period and the average amplitude is greater than 10%, determining that abnormal noise data exists in the transient noise signal in the switching-on/off period.
The embodiment of the application provides a transformer winding oscillatory wave high voltage opening Guan Zantai noise elimination device, includes:
the intercepting module is used for collecting the oscillating wave according to the switching-on and switching-off period of the direct-current high-voltage switch and intercepting the oscillating wave waveform into a plurality of independent oscillating wave waveforms; the single oscillating wave waveform corresponds to the separation and combination period;
an extraction module, configured to extract a frequency domain component according to the individual oscillatory wave waveform, and determine a transient noise signal according to the frequency domain component;
the judging module is used for judging whether the transient noise signal of each switching-on and switching-off period has abnormal noise data or not, and if so, removing the transient noise signal of the switching-on and switching-off period;
and the integration module is used for integrating the transient noise signals of the rest switching-on and switching-off periods to obtain a new oscillation wave signal.
An embodiment of the present application provides a computer device, including: a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps of any of the generation methods or the steps of any of the query methods described above.
By adopting the technical scheme, the invention can achieve the following beneficial effects:
the invention provides a method and a device for eliminating transient noise of a transformer winding oscillatory wave high-voltage switch, which collect periodic oscillatory waves through a switching period, intercept the oscillatory waves into oscillatory wave waveforms of an independent switching period according to the period, extract frequency domain components of the independent oscillatory wave waveforms, determine whether the signals are transient noise signals according to the frequency domain components, judge whether the signals are abnormal according to the amplitude and the frequency of the signals after the signals are determined to be the transient noise signals, delete all the transient noise signals of the whole switching period with abnormal noise, and then integrate the signals into new oscillatory wave signals. The transient noise signal caused by the high-voltage switch in the oscillatory wave detection is processed, the frequency, peak value and other key parameters of the oscillatory wave data obtained after abnormal noise removal are more accurate, and the problem that the winding state is misjudged in the denoising process is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating the steps of the method for eliminating transient noise of a transformer winding oscillatory wave high-voltage switch according to the present invention;
FIG. 2 is a schematic diagram of periodic high side oscillatory wave data in accordance with the present invention;
FIG. 3 is a schematic diagram of the location of transient noise of the high voltage switch according to the present invention;
FIG. 4 is an enlarged view of the location of the transient noise of the high voltage switch of the present invention;
FIG. 5 is a schematic diagram of the amplitude and frequency of the oscillatory wave of the present invention;
FIG. 6 is a schematic diagram of another amplitude and frequency of the oscillatory wave of the present invention;
FIG. 7 is a schematic diagram of an oscillatory wave signal after removing transient noise of the high-voltage switch according to the present invention;
FIG. 8 is a schematic structural diagram of the transient noise elimination apparatus for high-voltage switch of transformer winding oscillatory wave according to the present invention;
fig. 9 is a schematic structural diagram of computer equipment related to the method for eliminating transient noise of the transformer winding oscillating wave high-voltage switch according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following describes a specific method and apparatus for eliminating transient noise of a transformer winding oscillatory wave high-voltage switch provided in the embodiments of the present application with reference to the accompanying drawings.
As shown in fig. 1, a method for eliminating transient noise of a transformer winding oscillating wave high-voltage switch provided in an embodiment of the present application includes:
s101, collecting oscillation waves according to the on-off period of the direct-current high-voltage switch, and intercepting the oscillation wave waveforms into a plurality of independent oscillation wave waveforms; the single oscillating wave waveform corresponds to the separation and combination period;
it should be noted that, with each turn-off of the high-voltage switch, one oscillatory wave measurement is performed on the transformer winding, so that a small section of high-frequency noise caused by the high-voltage switch exists in the initial section of each oscillatory signal wave, and the obtained oscillatory wave signals are distributed periodically according to the switching on and off of the direct-current high-voltage switch. Therefore, the switching period of the high-voltage switch can be used as the period for intercepting the oscillating wave waveform.
According to the method, the oscillation waves are collected according to the on-off period of the direct-current high-voltage switch, then the waveform of the oscillation waves is intercepted according to the on-off period, and the single oscillation wave waveforms of a plurality of on-off periods are formed, namely the periods of the oscillation wave waveforms are the same as the on-off period of the direct-current high-voltage switch.
S102, extracting frequency domain components according to the single oscillatory wave waveform, and determining a transient noise signal according to the frequency domain components;
firstly, extracting frequency domain components of the waveform of the single oscillation wave of each switching-on and switching-off period, and determining whether the oscillation wave of the switching-on and switching-off period is a transient noise signal according to the frequency and amplitude of the partial frequency domain components.
S103, judging whether the transient noise signal of each switching-on and switching-off period has abnormal noise data, and if so, removing the transient noise signal of the switching-on and switching-off period;
judging whether the oscillation wave determined as the transient noise signal has abnormal noise data, if so, indicating that the signal is interfered by other factors in the acquisition process, because in a primary test, under the condition that other experimental conditions are not changed, the frequency and amplitude of the frequency domain component of the switching-on/off signal of the high-voltage switch cannot have larger difference, if the difference between the single noise signal and the average noise is larger, indicating that other abnormal noise sources exist in the signal acquisition process, and in order to enable the frequency, peak value and other key parameters of the acquired oscillation wave data to be more accurate, deleting all the oscillation wave data in the period, and then removing the transient noise signal in the switching-on/off period.
And S104, integrating the transient noise signals of the rest switching cycles to obtain a new oscillation wave signal.
And finally, integrating the transient noise signals of the rest switching cycles to obtain a new oscillation wave signal, and obtaining the oscillation wave after processing the abnormal data of the transient noise.
The working principle of the transient noise elimination method of the transformer winding oscillating wave high-voltage switch is as follows: the method comprises the steps of collecting periodic oscillation waves through a dividing and combining period, intercepting the oscillation waves into oscillation wave waveforms of the independent dividing and combining period according to the period, extracting frequency domain components of the independent oscillation wave waveforms, determining whether the signals are transient noise signals according to the frequency domain components, judging whether the signals are abnormal according to amplitude and frequency of the signals after the signals are determined to be the transient noise signals, deleting all transient noise signals of the whole dividing and combining period with abnormal noise, and integrating the signals into new oscillation wave signals.
In some embodiments, the oscillatory wave waveform is truncated into a plurality of separate oscillatory wave waveforms according to the divide-in-divide cycle.
Specifically, in the application, all the collected oscillation waveforms are intercepted into individual oscillation waveforms according to the switching on/off period of the direct-current high-voltage switch, and the periods of the oscillation waveforms should be the same as the switching on/off period of the direct-current high-voltage switch.
In some embodiments, said extracting frequency domain components from said individual oscillatory wave waveforms comprises:
carrying out fast Fourier transformation on each single oscillation wave waveform to obtain a frequency spectrum of each oscillation wave waveform;
and taking the maximum amplitude on the frequency spectrum as an oscillation wave frequency domain component.
As an embodiment, determining a transient noise signal from the frequency domain components comprises:
and when the amplitude of the frequency domain component is lower than the amplitude of the oscillation wave, the frequency is within a preset multiple range of the frequency of the oscillation wave, and the amplitude of the frequency domain component is close to the frequency, determining that the frequency domain component is a transient noise signal.
Wherein the preset multiple range is 2-5 times.
Specifically, in the present application, fast fourier transform is performed on the oscillation wave waveform of each individual period, and the largest amplitude value on the frequency spectrum of each oscillation wave waveform is the oscillation wave frequency domain component. The transient noise frequency domain component characteristics of the high-voltage switch are as follows: the amplitude is lower than the amplitude of the oscillation wave, and the frequency is 2-5 times of the frequency of the oscillation wave. If a frequency domain component meeting the above conditions exists in each separation and combination cycle, and the frequency and amplitude of the component in each cycle are close to each other, if the signal meeting the above characteristics is a transient noise signal, the signal is also called a high-voltage switch transient noise signal.
In some embodiments, the determining whether abnormal noise data exists in the transient noise signal for each switching-on/off cycle includes:
counting the frequency and amplitude of the transient noise signal of each split-combined period, and calculating the average frequency and average amplitude;
calculating the difference between the frequency and amplitude of the transient noise signal of each split-combination period and the average frequency and the average amplitude;
and when the difference value between the frequency of the transient noise signal in the switching-on and switching-off period and the average frequency is larger than a first preset value, and/or the difference value between the amplitude of the transient noise signal in the switching-on and switching-off period and the average amplitude is larger than a second preset value, determining that abnormal noise data exists in the transient noise signal in the switching-on and switching-off period.
As a preferred embodiment, when the difference between the frequency of the transient noise signal in the switching-on/switching-off period and the average frequency is greater than 15%, and/or the difference between the amplitude of the transient noise signal in the switching-on/switching-off period and the average amplitude is greater than 10%, it is determined that abnormal noise data exists in the transient noise signal in the switching-on/switching-off period.
Specifically, after extracting the frequency domain component of the transient noise signal, the frequency and amplitude of the frequency domain component of the transient noise signal in each switching-on/off cycle are counted to obtain their average value, if the difference between the amplitude of the noise frequency domain component in a certain switching-on/off cycle and the obtained average value is greater than 10%, and the difference between the frequency of the noise frequency domain component and the obtained average value is greater than 5%, it is indicated that the signal is interfered by other factors in the acquisition process, because in a test, under the condition that other experimental conditions are not changed, the frequency and amplitude of the frequency domain component of the high-voltage switching-on/off signal do not have a large difference, if the difference between a single noise signal and the average noise is large, it is indicated that other abnormal noise sources exist in the signal acquisition process, and in order to make the frequency, peak value and other key parameters of the acquired oscillation wave data more accurate, the oscillation data of the cycle should be deleted completely.
In some embodiments, the integrating the transient noise signals of the remaining switching cycles to obtain a new oscillatory wave signal includes:
white noise is adopted to replace the removed transient noise signal of the switching-on and switching-off period;
then integrating the transient noise signals of all the switching-on and switching-off periods to obtain oscillation wave frequency domain signals with noise removed;
and carrying out fast Fourier inverse change on the oscillation wave frequency domain signal subjected to the noise removal to obtain an oscillation wave signal subjected to the transient noise removal.
Specifically, on the frequency spectrum of the oscillation wave waveform of each single switching-on and switching-off period, the frequency domain component of the transient noise of the high-voltage switch is directly replaced by white noise, and the oscillation wave frequency domain signal with the noise removed is obtained. And then carrying out fast Fourier inverse change on the denoised oscillation wave frequency domain signal to obtain the oscillation wave signal without the high-voltage switch transient noise.
As a specific embodiment, as shown in fig. 2, in the present example, an oscillatory wave test was performed on a high-voltage winding of a certain 110kV transformer, and high-voltage side oscillatory wave data thereof was obtained. In fig. 2, the abscissa is time, and the ordinate is the collected voltage type, it can be seen that the signal of the section has 10 periods, which corresponds to 10 times of switching on and off of the dc high-voltage switch.
Then, the data in fig. 2 is cut into a single oscillation wave shape, and as shown in fig. 3, the period of the data is the same as the switching-on and switching-off period of the direct-current high-voltage switch. The position of the transient noise of the high-voltage switch in the frame of fig. 3 is shown in fig. 4 after amplification, and the transient noise signal may affect the normal signal judgment, so that the noise needs to be removed by a specific denoising means.
Therefore, firstly, to identify the transient noise of the high voltage switch, specifically, to perform fast fourier transform on the oscillation wave waveform of each individual period, as shown in fig. 5, the frequency spectrum of each oscillation wave waveform has the largest amplitude as the frequency domain component of the oscillation wave, and the amplitude of the oscillation wave waveform in this test is 783200, the frequency is 12.15kHz, and the frequency spectrum has the largest amplitude as the frequency component.
The transient noise frequency domain component characteristics of the high-voltage switch are as follows: the amplitude is lower than the amplitude of the oscillation wave, and the frequency is 2-5 times of the frequency of the oscillation wave. As shown in fig. 6, the amplitude of the switching on/off transient noise of the high-voltage switch in the test is 149100; the frequency is 30.65kHz, the amplitude is lower than the amplitude of the oscillation wave, the frequency is 2.52 times of the frequency domain component of the oscillation wave, and the characteristics are met, so that the frequency domain component can be determined to be transient noise of the high-voltage switch.
Through statistics, the amplitude and the frequency of the transient noise frequency domain component of the high-voltage switch in 10 periods are summarized as shown in table 1.
TABLE 1 amplitude and frequency of transient noise frequency domain components of high voltage switch over 10 cycles
It can be seen that frequency domain components satisfying the above conditions exist in almost every subsequent period, and the frequency and amplitude of the above components in each period are close, so that the signal can be determined to be a high-voltage switching transient noise frequency domain component.
Judging abnormal noise data through a high-voltage switch transient noise frequency domain component: after the frequency domain components of the noise signals are extracted, the frequency and the amplitude of the frequency domain components of the noise signals in 10 periods are counted, the average value of the frequency domain components is obtained, and the amplitude of the frequency domain components of the transient state noise of the high-voltage switch in each period and the difference between the frequency and the average value are calculated, as shown in the third row in table 1, the difference between the amplitude of the frequency domain components of the transient state noise of the high-voltage switch in the 4 th period and the obtained average value is larger than 10%, and the difference between the frequency of the frequency domain components of the noise signals and the obtained average value is larger than 5%. According to the judgment rule, the interference of other factors on the 4 th and 10 th periods in the acquisition process is explained, because in a primary test, under the condition that other experimental conditions are not changed, the frequency and amplitude of the frequency domain component of the high-voltage switch on-off signal do not have great difference, so that the difference between the 4 th and 10 th period noise signal and the average noise is great, it is explained that other abnormal noise sources exist in the signal acquisition process, and in order to make the frequency, peak value and other key parameters of the acquired oscillation wave data more accurate, the oscillation wave data of the 4 th and 10 th periods should be completely deleted.
Taking the 1 st cycle as an example, on the frequency spectrum of the oscillating wave waveform, the frequency domain component of the high-voltage switch transient noise after being removed is directly replaced by white noise, the frequency domain signal of the oscillation wave after the noise is removed is obtained, and the signal is subjected to inverse fourier transform to obtain the oscillation wave signal after the transient noise of the high-voltage switch is removed, as shown in fig. 7.
It can be seen from fig. 7 that the high-voltage switch transient noise is removed, and then the oscillating wave waveforms of periods 2, 3, 5, 6, 7, 8, and 9 are subjected to de-noising processing in the same manner, so as to obtain the oscillating wave signals with the high-voltage switch transient noise removed.
As shown in fig. 8, an embodiment of the present application provides a transformer winding oscillatory wave high voltage switching Guan Zantai noise cancellation apparatus, including:
the intercepting module 801 is used for collecting the oscillating wave according to the switching-on and switching-off period of the direct-current high-voltage switch and intercepting the oscillating wave waveform into a plurality of independent oscillating wave waveforms; the single oscillating wave waveform corresponds to the separation and combination period;
an extracting module 802, configured to extract a frequency domain component according to the individual oscillatory wave waveform, and determine a transient noise signal according to the frequency domain component;
a determining module 803, configured to determine whether the transient noise signal in each switching-on/off period has abnormal noise data, and if yes, remove the transient noise signal in the switching-on/off period;
and an integrating module 804, configured to integrate the transient noise signals of the remaining switching cycles to obtain a new oscillation wave signal.
The working principle of the transient noise elimination device for the transformer winding oscillatory wave high-voltage switch provided by the embodiment of the application is that the intercepting module 801 acquires oscillatory waves according to the switching-on and switching-off period of the direct-current high-voltage switch and intercepts oscillatory wave waveforms into a plurality of independent oscillatory wave waveforms; the single oscillating wave waveform corresponds to the separation and combination period; the extraction module 802 extracts a frequency domain component from the individual oscillatory wave waveforms, and determines a transient noise signal from the frequency domain component; the determining module 803 determines whether the transient noise signal of each switching cycle has abnormal noise data, and if yes, removes the transient noise signal of the switching cycle; the integration module 804 integrates the transient noise signals of the remaining switching cycles to obtain a new oscillation wave signal.
The present application provides a computer device comprising: a memory 1 and a processor 2, and may further include a network interface 3, wherein the memory 1 stores computer programs, and the memory 1 may include volatile memory in a computer readable medium, random Access Memory (RAM), and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM). The computer device stores an operating system 4, and the memory 1 is an example of a computer-readable medium. The computer program, when executed by the processor 2, causes the processor 2 to execute a transformer winding oscillatory wave high-voltage switching transient noise cancellation method, the structure shown in fig. 9 is a block diagram of only a part of the structure related to the present application, and does not constitute a limitation on the computer apparatus to which the present application is applied, and a specific computer apparatus may include more or less components than those shown in the figure, or combine some components, or have a different arrangement of components.
In one embodiment, the method for eliminating transient noise of high-voltage switch of transformer winding oscillation wave provided by the present application can be implemented in the form of a computer program, and the computer program can be run on a computer device as shown in fig. 9.
In some embodiments, the computer program, when executed by the processor, causes the processor to perform the steps of: collecting oscillation waves according to the on-off period of the direct-current high-voltage switch, and intercepting the oscillation wave waveforms into a plurality of independent oscillation wave waveforms; the single oscillating wave waveform corresponds to the separation and combination period; extracting frequency domain components according to the single oscillatory wave waveform, and determining a transient noise signal according to the frequency domain components; judging whether the transient noise signal of each switching-on and switching-off period has abnormal noise data or not, and if so, removing the transient noise signal of the switching-on and switching-off period; and integrating the transient noise signals of the rest of the switching cycles to obtain a new oscillation wave signal.
The present application also provides a computer storage medium, examples of which include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassette tape storage or other magnetic storage devices, or any other non-transmission medium, that can be used to store information that can be accessed by a computing device.
In some embodiments, the present invention further provides a computer-readable storage medium storing a computer program, which when executed by a processor, collects an oscillatory wave according to a switching cycle of a dc high-voltage switch and intercepts the oscillatory wave into a plurality of individual oscillatory wave waveforms; the single oscillating wave waveform corresponds to the separation and combination period; extracting frequency domain components according to the single oscillatory wave waveform, and determining a transient noise signal according to the frequency domain components; judging whether the transient noise signal of each switching-on and switching-off period has abnormal noise data or not, and if so, removing the transient noise signal of the switching-on and switching-off period; and integrating the transient noise signals of the rest of the switching cycles to obtain a new oscillation wave signal.
In summary, the present invention provides a method and a device for eliminating transient noise of a transformer winding oscillatory wave high-voltage switch, wherein the method includes collecting oscillatory waves according to a switching cycle of a dc high-voltage switch, and intercepting oscillatory wave waveforms into a plurality of individual oscillatory wave waveforms; the waveform of the single oscillation wave corresponds to the separation and combination period; extracting frequency domain components according to the single oscillatory wave waveform, and determining a transient noise signal according to the frequency domain components; judging whether the transient noise signal of each switching-on and switching-off period has abnormal noise data or not, and if so, removing the transient noise signal of the switching-on and switching-off period; and integrating the transient noise signals of the rest of the switching cycles to obtain a new oscillation wave signal. The method processes the transient noise signal caused by the high-voltage switch in the oscillatory wave detection, so that the frequency, peak value and other key parameters of the oscillatory wave data obtained after abnormal noise is removed are more accurate, and the problem of misjudgment of the winding state in the denoising process is solved.
It can be understood that the method embodiments provided above correspond to the apparatus embodiments described above, and corresponding specific contents may be referred to each other, which are not described herein again.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A transient noise elimination method for a transformer winding oscillating wave high-voltage switch is characterized by comprising the following steps:
collecting oscillation waves according to the switching-on and switching-off period of the direct-current high-voltage switch, and intercepting the oscillation wave waveforms into a plurality of independent oscillation wave waveforms; the single oscillating wave waveform corresponds to the separation and combination period;
extracting frequency domain components according to the single oscillatory wave waveform, and determining a transient noise signal according to the frequency domain components;
judging whether the transient noise signal of each switching-on and switching-off period has abnormal noise data or not, and if so, removing the transient noise signal of the switching-on and switching-off period;
and integrating the transient noise signals of the rest of the switching cycles to obtain a new oscillation wave signal.
2. The method of claim 1,
and intercepting the oscillatory wave waveform into a plurality of independent oscillatory wave waveforms according to the separation and combination period.
3. The method according to claim 1 or 2, wherein the extracting frequency domain components from the individual oscillatory wave waveforms comprises:
carrying out fast Fourier transformation on each single oscillation wave waveform to obtain a frequency spectrum of each oscillation wave waveform;
and taking the maximum amplitude on the frequency spectrum as an oscillation wave frequency domain component.
4. The method of claim 3, wherein determining a transient noise signal from the frequency domain components comprises:
and when the amplitude of the frequency domain component is lower than the amplitude of the oscillation wave, the frequency is within a preset multiple range of the frequency of the oscillation wave, and the amplitude of the frequency domain component is close to the frequency, determining that the frequency domain component is a transient noise signal.
5. The method according to claim 1, wherein the determining whether abnormal noise data exists in the transient noise signal for each switching cycle comprises:
counting the frequency and amplitude of the transient noise signal of each split-combined period, and calculating the average frequency and average amplitude;
calculating the difference between the frequency and amplitude of the transient noise signal of each split-combination period and the average frequency and the average amplitude;
and when the difference value between the frequency of the transient noise signal in the switching-on and switching-off period and the average frequency is larger than a first preset value, and/or the difference value between the amplitude of the transient noise signal in the switching-on and switching-off period and the average amplitude is larger than a second preset value, determining that abnormal noise data exists in the transient noise signal in the switching-on and switching-off period.
6. The method of claim 1, wherein said integrating the transient noise signals of the remaining deciliter cycles to obtain a new oscillatory wave signal comprises:
replacing the removed transient noise signal of the switching-on and switching-off period by white noise;
then integrating the transient noise signals of all the switching cycles to obtain oscillation wave frequency domain signals with noise removed;
and carrying out fast Fourier inverse change on the oscillation wave frequency domain signal subjected to the noise removal to obtain an oscillation wave signal subjected to the transient noise removal.
7. The method of claim 4,
the preset multiple range is 2-5 times.
8. The method of claim 5,
and when the difference value between the frequency of the transient noise signal in the switching-on and switching-off period and the average frequency is larger than 15%, and/or the difference value between the amplitude of the transient noise signal in the switching-on and switching-off period and the average amplitude is larger than 10%, determining that abnormal noise data exists in the transient noise signal in the switching-on and switching-off period.
9. A transformer winding oscillatory wave high voltage switching Guan Zantai noise cancellation device, comprising:
the intercepting module is used for collecting the oscillating wave according to the switching-on and switching-off period of the direct-current high-voltage switch and intercepting the oscillating wave into a plurality of independent oscillating wave waveforms; the single oscillating wave waveform corresponds to the separation and combination period;
an extraction module, configured to extract a frequency domain component according to the individual oscillatory wave waveform, and determine a transient noise signal according to the frequency domain component;
the judging module is used for judging whether the transient noise signal of each switching-on and switching-off period has abnormal noise data or not, and if so, removing the transient noise signal of the switching-on and switching-off period;
an integration module for integrating the transient noise signals of the remaining integration and separation periods, and obtaining a new oscillating wave signal.
10. A computer device, comprising: a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the transformer winding oscillating wave high voltage switching transient noise cancellation method of any of claims 1 to 8.
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| CN116593941A (en) * | 2023-05-08 | 2023-08-15 | 安徽大学 | Traction transformer winding radial cumulative deformation simulation device and diagnosis method thereof |
| CN116593941B (en) * | 2023-05-08 | 2024-05-14 | 安徽大学 | Traction transformer winding radial cumulative deformation simulation device and diagnosis method thereof |
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