CN113055102A - Receiver and method for ultrahigh frequency partial discharge detection - Google Patents
Receiver and method for ultrahigh frequency partial discharge detection Download PDFInfo
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Abstract
The present disclosure provides a receiver for ultra-high frequency partial discharge detection. The receiver includes: the first frequency mixer and the second frequency mixer are used for respectively mixing the partial discharge real signal with a first local oscillation signal and a second local oscillation signal to obtain a first intermediate frequency signal and a second intermediate frequency signal, and the second local oscillation signal leads the first local oscillation signal by 90 degrees in phase; a first anti-aliasing filter for filtering the first intermediate frequency signal; a first analog-to-digital converter for converting the filtered first intermediate frequency signal into a first digital signal at a sampling frequency; a second anti-aliasing filter for filtering the second intermediate frequency signal; a second analog-to-digital converter for converting the filtered second intermediate frequency signal into a second digital signal at the sampling frequency; a delay that delays the second digital signal by 1/4 clock cycles; and the adder adds the first digital signal and the delayed second digital signal to obtain a partial discharge digital signal.
Description
Technical Field
The disclosure relates to the technical field of power detection, in particular to a receiver and a method for ultrahigh frequency partial discharge detection.
Background
The existing ultrahigh frequency partial discharge detection technology and product have the advantages of corona interference resistance, high detection sensitivity, environmental interference resistance and the like, and are the mainstream technology of the existing partial detection; the common two systems of frequency mixing and wave detection are provided, and the frequency mixing system has high fidelity of partial discharge phase information and anti-interference function.
In the partial discharge receiver of the frequency mixing system, because the received partial discharge signal is a real signal, the frequency spectrum of the real signal is a double sideband with conjugate symmetry, and an image frequency spectrum exists, when simple real number frequency mixing is adopted and the radio frequency signal is moved to a zero intermediate frequency, the image frequency spectrum and the useful frequency spectrum are simultaneously moved to the zero intermediate frequency, so that image frequency spectrum interference is caused, and the sensitivity and the detection reliability of the receiver are influenced.
Therefore, eliminating the mirror spectrum in the partial discharge detection is the key to improve the sensitivity of the UHF partial discharge receiver.
Disclosure of Invention
In view of the above, the present disclosure is directed to a receiver and a method for uhf partial discharge detection.
In view of the above, the present disclosure provides a receiver for ultra-high frequency partial discharge detection, comprising:
the first frequency mixer is used for mixing the partial discharge real signal with a first local oscillation signal to obtain a first intermediate frequency signal;
a second mixer, configured to mix the partial discharge real signal with a second local oscillator signal to obtain a second intermediate frequency signal, where the second local oscillator signal leads the first local oscillator signal by 90 degrees in phase;
a first anti-aliasing filter for performing anti-aliasing filtering on the first intermediate frequency signal;
a first analog-to-digital converter for converting the anti-aliasing filtered first intermediate frequency signal into a first digital signal at a sampling frequency;
a second anti-aliasing filter for anti-aliasing filtering the second intermediate frequency signal;
a second analog-to-digital converter for converting the anti-aliasing filtered second intermediate frequency signal into a second digital signal at the sampling frequency;
a delay for delaying the second digital signal by 1/4 clock cycles, the clock cycles being equal to the inverse of the sampling frequency; and
an adder for adding the first digital signal and the delayed second digital signal to obtain a partial discharge digital signal.
Optionally, the first anti-aliasing filter and the second anti-aliasing filter both have a first bandwidth;
the sampling frequency is equal to 4 times the first bandwidth.
Optionally, the first bandwidth is 20MHz, and the sampling frequency is 80 MHz.
Optionally, the receiver further comprises:
a band pass filter for band pass filtering a partial discharge signal received through the antenna;
and the first low-noise amplifier is used for amplifying the partial discharge signal subjected to band-pass filtering to obtain the partial discharge real signal.
Optionally, the receiver further comprises:
a local oscillator that generates the first local oscillator signal and the second local oscillator signal;
and the phase shifter is used for shifting the phase of the first local oscillation signal by 90 degrees to obtain the second local oscillation signal.
Optionally, the passband of the band pass filter is 300MHz to 1500MHz, and the local oscillator can generate a local oscillation signal within a frequency range of 300MHz to 1500 MHz.
Optionally, the receiver further comprises:
a second lna, connected between the first mixer and the first anti-aliasing filter, for amplifying the first intermediate frequency signal;
a third lna, connected between the second mixer and the second anti-aliasing filter, for amplifying the second intermediate frequency signal.
Optionally, the adder is further configured to perform an anti-overflow process on the partial discharge digital signal.
The present disclosure also provides a method for ultra-high frequency partial discharge detection, comprising:
mixing the partial discharge real signal with a first local oscillation signal to obtain a first intermediate frequency signal;
mixing the partial discharge real signal with a second local oscillation signal to obtain a second intermediate frequency signal, wherein the second local oscillation signal leads the first local oscillation signal by 90 degrees in phase;
performing anti-aliasing filtering on the first intermediate frequency signal, and converting the anti-aliasing filtered first intermediate frequency signal into a first digital signal at a sampling frequency;
performing anti-aliasing filtering on the second intermediate frequency signal, and converting the anti-aliasing filtered second intermediate frequency signal into a second digital signal at the sampling frequency;
delaying the second digital signal by 1/4 clock cycles, the clock cycles equal to the inverse of the sampling frequency; and
and adding the first digital signal and the delayed second digital signal to obtain a partial discharge digital signal.
Optionally, the method further comprises:
performing band-pass filtering on the partial discharge signal received through the antenna;
amplifying the partial discharge signal subjected to band-pass filtering to obtain the partial discharge real signal.
According to the embodiment of the disclosure, the phase alignment of the first digital signal and the second digital signal is realized by delaying the second digital signal in the digital domain for 1/4 sampling clock cycles, and then the first digital signal and the second digital signal are directly added, and the combined signal is an ideal partial discharge signal with the image spectrum interference eliminated, so that the sensitivity of the receiver is improved. In addition, signal combination is realized in a digital domain, the anti-interference performance is stronger, and the signal distortion degree is smaller.
Drawings
In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a receiver for uhf partial discharge detection according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of the Hartley image rejection principle;
fig. 3 is a schematic structural diagram of a receiver for uhf partial discharge detection according to another embodiment of the present disclosure;
fig. 4 is a schematic diagram of an application example of an uhf partial discharge detection receiver according to an embodiment of the present disclosure;
fig. 5 is a schematic flowchart of a method for detecting an ultra-high frequency partial discharge according to an embodiment of the disclosure.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
It is to be noted that technical terms or scientific terms used in the embodiments of the present disclosure should have a general meaning as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the disclosure is not intended to indicate any order, quantity, or importance, but rather to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
As described in the background art, the frequency spectrum of a radio frequency signal is moved to an intermediate frequency by mixing, so that the intermediate frequency signal is sampled, and the sampling is easier to realize as the frequency of the intermediate frequency signal is lower, the frequency adopted by an analog-to-digital converter is also lower, wherein the radio frequency signal is a real signal, and the frequency spectrum of the real signal is a conjugate symmetric double-sideband, i.e., a symmetric mirror image frequency spectrum; when the frequency spectrum of the radio frequency signal is moved to the intermediate frequency through mixing, the image spectrum enters an anti-aliasing filter, when the image spectrum is completely overlapped with the useful spectrum, any anti-aliasing filter is not used, and the image spectrum interference is introduced when the analog-to-digital converter performs sampling.
In the related art, after quadrature frequency mixing, a second local oscillator signal is delayed by 90 degrees in an analog domain through a phase shifter so that phase alignment of a first local oscillator signal and the second local oscillator signal is achieved, the first local oscillator signal and the second local oscillator signal are superposed by using a high-cost large-bandwidth bridge chip and combined into a complete analog signal, and then analog-to-digital conversion is performed on the analog signal to obtain a digital signal. The use of a large bandwidth bridge chip greatly increases the cost and the phase modulation effect in the analog domain is not ideal.
In view of the above problems in the related art, and based on the findings of the foregoing inventors, the embodiments of the present disclosure provide an ultra-high frequency partial discharge detection receiver. The phase alignment of the second digital signal and the first digital signal is accomplished in the digital domain by shifting the phase of the second digital signal in the digital domain.
Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a receiver for ultra-high frequency partial discharge detection may include: a first mixer 1003, a second mixer 1004, a first anti-aliasing filter 1009, a first analog-to-digital converter 1011, a second anti-aliasing filter 1010, a second analog-to-digital converter 1012, a delay 1013, an adder 1014, a band-pass filter 1001, a first low noise amplifier 1002, a local oscillator 1005, a phase shifter 1006, a second low noise amplifier 1007, and a third low noise amplifier 1008.
The band pass filter 1001 may band pass filter a partial discharge signal received through an antenna. For example, the passband of the band pass filter 1001 may be preset to 300MHz-1500 MHz.
The first low noise amplifier 1002 may perform low noise amplification on the partial discharge signal output from the band pass filter 1001 to obtain a partial discharge real signal and provide it to the first mixer 1003 and the second mixer 1004. A Low Noise Amplifier (LNA) is an Amplifier with a very Low Noise coefficient, and is generally used in an amplifying circuit of a high-sensitivity electronic detection device.
In some embodiments, the local oscillator 1005 may be used to provide first and second local oscillator signals, which are orthogonal to each other, to the first mixer 1003 and the second mixer 1004, respectively. The second local oscillator signal may be advanced in phase by 90 degrees from the first local oscillator signal.
The first mixer 1003 may multiply the received partial discharge real signal by the first local oscillation signal to implement frequency mixing, so as to obtain a first intermediate frequency signal. The second mixer 1004 may multiply the received partial discharge real signal by a second local oscillation signal to implement frequency mixing, so as to obtain a second intermediate frequency signal. The first intermediate frequency signal and the second intermediate frequency signal may also be referred to as an I-path signal and a Q-path signal, respectively. For example, referring to fig. 4, the local oscillator 1005 can generate a local oscillator signal in a frequency range of 300MHz to 1500MHz that meets the sampling standard through power conversion.
The second and third low noise amplifiers 1007 and 1008 may perform low noise amplification on the first and second intermediate frequency signals, respectively, to improve the signal-to-noise ratio of the signals.
The first and second anti-aliasing filters 1009 and 1010 may perform anti-aliasing filtering on the low-noise amplified first and second intermediate frequency signals, respectively. The anti-aliasing filter can effectively ensure the protection set for preventing the maximum frequency of the input signal from colliding with the sampling frequency before the holding and sampling. Because the frequency of the conventional sampling is more than twice of the highest frequency of the input signal according to the nyquist theorem, other frequencies in the input signal exceeding the highest frequency, particularly the frequencies close to the sampling frequency, need to be suppressed by an anti-aliasing filter, so that frequency aliasing is prevented during sampling, and preparation is made for next signal sampling. As an example, referring to fig. 4, the bandwidths of the first and second anti-aliasing filters 1009 and 1010 may be set to 20 MHz.
The first analog-to-digital converter 1011 and the second analog-to-digital converter 1012 may perform analog-to-digital conversion on the anti-aliasing filtered first intermediate frequency signal and second intermediate frequency signal at the same sampling frequency, respectively, to obtain a first digital signal and a second digital signal. For example, referring to fig. 4, the sampling frequency may be set to 80MHz, i.e., may be 4 times the bandwidth of the first and second anti-aliasing filters 1009 and 1010.
Since the first mixer 1009 and the second mixer 1010 perform quadrature mixing on the partial discharge real signals as described above, the phases of the first digital signal and the second digital signal are not aligned, and the second digital signal is delayed by 90 degrees from the first digital signal. To this end, using hartley image rejection in the digital domain, the second digital signal is delayed 1/4 clock cycles equal to the inverse of the above-mentioned sampling frequency by means of a delay 1013, 1/4 clock cycles corresponding to 90 degrees. In this way, phase alignment of the first digital signal and the second digital signal can be achieved, while image spectrum interference is eliminated. The principle of hartley image rejection is shown in fig. 2.
The adder 1014 may add the first digital signal and the delayed second digital signal to obtain a partial discharge digital signal.
Referring to fig. 3, another embodiment of the present disclosure provides another receiver for uhf partial discharge detection similar to the receiver shown in fig. 1. The receiver may include: a first mixer 3001, a second mixer 3002, a local oscillator 3003, a delay 3011, a second low noise amplifier 3005, a third low noise amplifier 3006, a first anti-aliasing filter 3007, a first analog-to-digital converter 3009, a second anti-aliasing filter 3008, a second analog-to-digital converter 3010, a phase shifter 3004, and an adder 3012.
The first mixer 3001 and the second mixer 3002 receive the partial discharge real signal and two paths of orthogonal local oscillation signals (i.e., the first local oscillation signal and the second local oscillation signal that leads the first local oscillation signal by 90 degrees in phase) sent by the local oscillator, and multiply the partial discharge signal by the two paths of local oscillation signals to complete orthogonal frequency mixing, thereby obtaining a first intermediate frequency signal and a second intermediate frequency signal.
Then, the first intermediate frequency signal is processed by the second low noise amplifier 3005, the first anti-aliasing filter 3007 and the first analog-to-digital converter 3009 in sequence to obtain a first digital signal. The second intermediate frequency signal is processed by the third low noise amplifier 3006, the second anti-aliasing filter 3008 and the second analog-to-digital converter 3010 in sequence to obtain a second digital signal.
The output of the second analog-to-digital converter 3010 is connected to a delay 3011, and the delay 3011 may delay the second digital signal by 1/4 sampling clock cycles. The first digital signal and the delayed second digital signal are added or combined by the adder 3012, and the obtained electrical signal is the ideal partial discharge signal.
In the related art, after quadrature mixing, a first intermediate frequency signal and a second intermediate frequency signal (which may also be referred to as an I-path signal and a Q-path signal) are directly aligned in phase in an analog domain, then the aligned first intermediate frequency signal and second intermediate frequency signal are added by using a large-bandwidth analog bridge chip, then a signal obtained by the addition is sampled by using an analog-to-digital converter, converted into a digital signal, and finally the digital signal is detected. In contrast, according to the embodiment of the present disclosure, the delay phase and the signal combination are both completed in the digital domain, so that the use of a large-bandwidth analog bridge chip is avoided, the cost is reduced, and the electric signal obtained by combining in the digital domain has stronger anti-interference performance and smaller signal distortion.
The embodiment of the disclosure also provides an ultrahigh frequency partial discharge detection method, which is realized based on the ultrahigh frequency partial discharge detection receiver. Fig. 5 is a flow chart of the uhf partial discharge detection method. As shown in fig. 5, the method may include:
step S501, performing complex frequency mixing on the partial discharge real signal and a first local oscillation signal to obtain a first intermediate frequency signal;
step S502, performing complex frequency mixing on the partial discharge real signal and a second local oscillation signal to obtain a second intermediate frequency signal, wherein the second local oscillation signal leads the first local oscillation signal by 90 degrees in phase;
step S503, performing anti-aliasing filtering on the first intermediate frequency signal, and converting the anti-aliasing filtered first intermediate frequency signal into a first digital signal at a sampling frequency;
step S504, performing anti-aliasing filtering on the second intermediate frequency signal, and converting the anti-aliasing filtered second intermediate frequency signal into a second digital signal at the sampling frequency;
step S505, delaying the second digital signal by 1/4 clock cycles, where the clock cycles are equal to the inverse of the sampling frequency; and
step S506, adding the first digital signal and the delayed second digital signal to obtain a partial discharge digital signal.
In some embodiments, the method may further comprise: performing band-pass filtering on the partial discharge signal received through the antenna; amplifying the partial discharge signal subjected to band-pass filtering to obtain the partial discharge real signal.
It should be noted that the above describes some embodiments of the disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the present disclosure, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.
In addition, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown in the provided figures for simplicity of illustration and discussion, and so as not to obscure the embodiments of the disclosure. Furthermore, devices may be shown in block diagram form in order to avoid obscuring embodiments of the present disclosure, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the embodiments of the present disclosure are to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that the embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.
The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made within the spirit and principles of the embodiments of the disclosure are intended to be included within the scope of the disclosure.
Claims (10)
1. A receiver for ultra-high frequency partial discharge detection, comprising:
the first frequency mixer is used for mixing the partial discharge real signal with a first local oscillation signal to obtain a first intermediate frequency signal;
a second mixer, configured to mix the partial discharge real signal with a second local oscillator signal to obtain a second intermediate frequency signal, where the second local oscillator signal leads the first local oscillator signal by 90 degrees in phase;
a first anti-aliasing filter for performing anti-aliasing filtering on the first intermediate frequency signal;
a first analog-to-digital converter for converting the anti-aliasing filtered first intermediate frequency signal into a first digital signal at a sampling frequency;
a second anti-aliasing filter for anti-aliasing filtering the second intermediate frequency signal;
a second analog-to-digital converter for converting the anti-aliasing filtered second intermediate frequency signal into a second digital signal at the sampling frequency;
a delay for delaying the second digital signal by 1/4 clock cycles, the clock cycles being equal to the inverse of the sampling frequency; and
an adder for adding the first digital signal and the delayed second digital signal to obtain a partial discharge digital signal.
2. The receiver of claim 1, wherein,
the first anti-aliasing filter and the second anti-aliasing filter both have a first bandwidth;
the sampling frequency is equal to 4 times the first bandwidth.
3. The receiver of claim 2, wherein the first bandwidth is 20MHz and the sampling frequency is 80 MHz.
4. The receiver of any of claims 1 to 3, further comprising:
a band pass filter for band pass filtering a partial discharge signal received through the antenna;
and the first low-noise amplifier is used for amplifying the partial discharge signal subjected to band-pass filtering to obtain the partial discharge real signal.
5. The receiver of claim 4, further comprising:
a local oscillator for generating the first local oscillator signal and the second local oscillator signal;
and the phase shifter is used for shifting the phase of the first local oscillation signal by 90 degrees to obtain the second local oscillation signal.
6. The receiver of claim 5, wherein,
the passband of the band-pass filter is 300MHz-1500 MHz;
the local oscillator can generate local oscillation signals within the frequency range of 300MHz-1500 MHz.
7. The receiver of claim 4, further comprising:
a second lna, connected between the first mixer and the first anti-aliasing filter, for amplifying the first intermediate frequency signal;
a third lna, connected between the second mixer and the second anti-aliasing filter, for amplifying the second intermediate frequency signal.
8. The receiver of any one of claims 1 to 3, wherein the adder is further configured to perform an anti-overflow process on the partial discharge digital signal.
9. A method for ultra-high frequency partial discharge detection, comprising:
mixing the partial discharge real signal with a first local oscillation signal to obtain a first intermediate frequency signal;
mixing the partial discharge real signal with a second local oscillation signal to obtain a second intermediate frequency signal, wherein the second local oscillation signal leads the first local oscillation signal by 90 degrees in phase;
performing anti-aliasing filtering on the first intermediate frequency signal, and converting the anti-aliasing filtered first intermediate frequency signal into a first digital signal at a sampling frequency;
performing anti-aliasing filtering on the second intermediate frequency signal, and converting the anti-aliasing filtered second intermediate frequency signal into a second digital signal at the sampling frequency;
delaying the second digital signal by 1/4 clock cycles, the clock cycles equal to the inverse of the sampling frequency; and
and adding the first digital signal and the delayed second digital signal to obtain a partial discharge digital signal.
10. The method of claim 9, further comprising:
performing band-pass filtering on the partial discharge signal received through the antenna;
amplifying the partial discharge signal subjected to band-pass filtering to obtain the partial discharge real signal.
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| CN202110221006.1A CN113055102A (en) | 2021-02-26 | 2021-02-26 | Receiver and method for ultrahigh frequency partial discharge detection |
| PCT/CN2021/102978 WO2022179021A1 (en) | 2021-02-26 | 2021-06-29 | Receiver and method for use in ultra high frequency partial discharge detection |
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| CN202110221006.1A CN113055102A (en) | 2021-02-26 | 2021-02-26 | Receiver and method for ultrahigh frequency partial discharge detection |
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| CN113625132A (en) * | 2021-08-06 | 2021-11-09 | 国网上海市电力公司 | Cable partial discharge detection method and system based on phase alignment |
| CN114978212A (en) * | 2022-07-05 | 2022-08-30 | 创远信科(上海)技术股份有限公司 | Receiver system for realizing low-intermediate frequency image rejection broadband function based on numerical control phase shift |
| WO2022179021A1 (en) * | 2021-02-26 | 2022-09-01 | 北京国电通网络技术有限公司 | Receiver and method for use in ultra high frequency partial discharge detection |
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| WO2022179021A1 (en) | 2022-09-01 |
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