CN111289864B - Partial discharge high-frequency current anti-interference detection system and method - Google Patents
Partial discharge high-frequency current anti-interference detection system and method Download PDFInfo
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Abstract
The invention discloses a partial discharge high-frequency current anti-interference detection system and a method, wherein the system comprises a signal generating device, a signal processing device and a signal processing device, wherein the signal generating device is used for outputting high-frequency current signals, and the high-frequency current signals comprise partial discharge high-frequency current signals and interference signals; a reference signal generating device for outputting a reference signal having an amplitude, a frequency, and a phase equal to the interference signal; and the cancellation device is used for filtering interference signals in the high-frequency current signals according to the high-frequency current signals and the reference signals to obtain partial discharge high-frequency current signals. By implementing the invention, a path of reference signal with the same frequency and the same phase as the interference signal can be actively generated by the reference signal generating device according to the high-frequency current signal generated by the signal generating device, and the cancellation device and the partial discharge high-frequency current signal superposed with the interference signal are subjected to differential operation, so that the elimination of the interference signal is realized, the operation complexity can be reduced, and the filtering efficiency of the interference signal can be improved.
Description
Technical Field
The invention relates to the field of power equipment detection, in particular to a partial discharge high-frequency current anti-interference detection system and a partial discharge high-frequency current anti-interference detection method.
Background
At present, the high-frequency current sensor has the characteristic of easy field installation, and is the most widely used sensor in the detection application of power equipment. However, a site in which the high-frequency current sensor is installed usually has a narrow-band interference, which may seriously interfere with the operation of the high-frequency current sensor. The partial discharge is an intermittent partial breakdown phenomenon when the power equipment is partially failed, and the power equipment failure can be effectively early warned in advance by detecting the partial discharge. If narrow-band interference exists in the installation site of the high-frequency current sensor, a narrow-band interference signal is superposed in a partial discharge high-frequency current signal output by the high-frequency current sensor, and therefore early warning of power equipment faults is influenced. In the prior art, frequency spectrum analysis is usually performed on a detection signal in partial discharge data processing software, after a main frequency of narrowband interference is found, the narrowband interference is filtered by using a band elimination filter of which the center frequency is the main frequency of the narrowband interference, however, the calculation complexity of the processing software is often increased, and the efficiency is lowered.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of high operation complexity and low efficiency of filtering narrow-band interference by software in the prior art, thereby providing a partial discharge high-frequency current anti-interference detection system and method.
According to a first aspect, an embodiment of the present invention provides a partial discharge high-frequency current anti-interference detection system, including: the signal generating device is used for outputting a high-frequency current signal, and the high-frequency current signal comprises a partial discharge high-frequency current signal and an interference signal; the reference signal generating device is used for outputting a reference signal with the amplitude, the frequency and the phase equal to the interference signal; and the offset device is used for filtering interference signals in the high-frequency current signals according to the high-frequency current signals and the reference signals to obtain partial discharge high-frequency current signals.
With reference to the first aspect, in a first implementation form of the first aspect, the signal generating device comprises a high-frequency current sensor; the reference signal generating device comprises a multiplier, a low-pass filter, a voltage-controlled oscillator and a phase shifter which are connected in sequence; a first input terminal of the reference signal generating device, which is arranged at a first terminal of the multiplier; the second input end of the reference signal generating device is arranged at the second end of the multiplier; and the output end of the reference signal generating device is arranged at the output end of the phase shifter.
With reference to the first implementation manner of the first aspect, in a second implementation manner of the first aspect, the multiplier is disposed between the signal generating device and the low-pass filter, a first end of the multiplier is connected to an output end of the signal generating device, and a second end of the multiplier is connected to an output end of the voltage-controlled oscillator, and is configured to output a first output signal including a difference frequency signal and a sum frequency signal.
With reference to the second implementation manner of the first aspect, in a third implementation manner of the first aspect, the low-pass filter is disposed between the multiplier and the voltage-controlled oscillator, and connected to an output end of the multiplier, and is configured to filter a sum-frequency signal in the first output signal to obtain a second output signal.
With reference to the third implementation manner of the first aspect, in a fourth implementation manner of the first aspect, the voltage-controlled oscillator is disposed between the low-pass filter and the phase shifter, and is connected to an output end of the low-pass filter, the low-pass filter controls a center frequency of an output signal of the voltage-controlled oscillator to be equal to a center frequency of the interference signal, adjusts an amplitude of the output signal of the voltage-controlled oscillator to be equal to an amplitude of the interference signal, and generates a third output signal having the same amplitude and the same frequency as the interference signal.
With reference to the fourth implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the phase shifter is disposed between the voltage-controlled oscillator and the cancellation device, and connected to an output end of the voltage-controlled oscillator, and configured to perform phase compensation on the third output signal, where an amount of the phase compensation is a difference between an initial phase of the interference signal and an initial phase of the third output signal, and generate a reference signal having the same amplitude, frequency and phase as the interference signal.
With reference to the first aspect or any implementation manner of the first aspect, the cancellation device includes a subtractor; the first end of the subtracter is connected with the output end of the signal generating device, the second output end of the subtracter is connected with the output end of the reference signal generating device, and the high-frequency current signal is subtracted from the reference signal to eliminate the interference signal.
According to a second aspect, an embodiment of the present invention provides a method for detecting interference resistance to a partial discharge high-frequency current, which is applied to the system for detecting interference resistance to a partial discharge high-frequency current according to the first aspect or any implementation manner of the first aspect, and includes: acquiring a high-frequency current signal of a signal generating device, wherein the high-frequency current signal comprises a partial discharge high-frequency current signal and a superposed interference signal; inputting the high-frequency current signal to a reference signal generating device, processing the high-frequency current signal, and generating a reference signal which is equal to the amplitude, the phase and the frequency of the interference signal; and obtaining the partial discharge high-frequency current signal according to the high-frequency current signal and the reference signal.
With reference to the second aspect, in a first implementation manner of the second aspect, the processing the high-frequency current signal to generate a reference signal equal to the interference signal in amplitude, phase, and frequency includes: acquiring an initial signal of a second input device, and multiplying the high-frequency current signal by the initial signal to obtain a multiplied signal; filtering the multiplied signal to obtain a filtered signal; obtaining an oscillation signal according to the filtering signal, wherein the frequency of the oscillation signal corresponds to the filtering signal; controlling the central frequency of the oscillation signal to be equal to the central frequency of the interference signal to obtain a control signal; adjusting the amplitude of the control signal to be equal to the amplitude of the interference signal to obtain an adjustment signal; compensating the phase of the adjusting signal to obtain a reference signal which is equal to the amplitude, the phase and the frequency of the interference signal; the compensation amount of the phase is the difference between the initial phase of the interference signal and the initial phase of the adjusting signal.
With reference to the first embodiment of the second aspect, in a second embodiment of the second aspect, the obtaining the partial discharge high-frequency current signal according to the high-frequency current signal and the reference signal includes: and carrying out difference operation on the high-frequency current signal and the reference signal, and eliminating the interference signal superposed in the high-frequency current signal to obtain the partial discharge high-frequency current signal.
The technical scheme of the invention has the following advantages:
1. the invention provides a partial discharge high-frequency current anti-interference detection system, which comprises a signal generating device, a reference signal generating device and a counteracting device, wherein the signal generating device is used for outputting high-frequency current signals, and the high-frequency current signals comprise partial discharge high-frequency current signals and interference signals; a reference signal generating device for outputting a reference signal having an amplitude, a frequency, and a phase equal to the interference signal; and the cancellation device is used for filtering interference signals in the high-frequency current signals according to the high-frequency current signals and the reference signals to obtain partial discharge high-frequency current signals. The system can actively generate a reference signal with the same frequency and the same phase as the interference signal through the reference signal generating device according to the high-frequency current signal generated by the signal generating device, and carries out differential operation on the local discharge high-frequency current signal superposed with the interference signal through the offsetting device to eliminate the interference signal.
2. The invention provides a partial discharge high-frequency current anti-interference detection method, which comprises the steps of obtaining a high-frequency current signal of a signal generating device, wherein the high-frequency current signal comprises a partial discharge high-frequency current signal and a superposed interference signal; inputting the high-frequency current signal into a reference signal generating device, processing the high-frequency current signal, and generating a reference signal which is equal to the amplitude, the phase and the frequency of the interference signal; and obtaining a partial discharge high-frequency current signal according to the high-frequency current signal and the reference signal. The anti-interference detection method for the partial discharge high-frequency current reduces the operation complexity and improves the filtering efficiency of interference signals.
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 embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic block diagram of a partial discharge high-frequency current anti-interference detection system in an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a partial discharge high-frequency current anti-interference detection system in an embodiment of the present invention;
fig. 3 is a flowchart of a method for detecting interference resistance to partial discharge high-frequency current according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The present embodiment provides an anti-interference detection system for partial discharge high-frequency current, which is applied to partial discharge detection of power equipment to eliminate an interference signal superimposed on a partial discharge high-frequency current signal, as shown in fig. 1, the system includes: signal generating means 11, reference signal generating means 12 and cancelling means 13.
The signal generating device 11 is used for outputting a high-frequency current signal, and the high-frequency current signal comprises a partial discharge high-frequency current signal and an interference signal.
And a reference signal generating device 12 for outputting a reference signal having an amplitude, a frequency and a phase equal to those of the interference signal.
And the cancellation device 13 is configured to filter an interference signal in the high-frequency current signal according to the high-frequency current signal and the reference signal, so as to obtain a partial discharge high-frequency current signal.
Illustratively, the signal generating device is used for generating a high-frequency current signal, and since the high-frequency current signal output by the signal generating device is influenced by the external environment, an interference signal, such as a narrow-band interference signal, is superimposed on the output high-frequency current signal, so that the high-frequency current signal output by the signal generating device includes a partial discharge high-frequency current signal and a narrow-band interference signal. The output end of the signal generating device is connected with the input end of the reference signal generating device, the high-frequency current signal with the narrow-band interference signal output by the signal generating device is input to the reference signal generating device, and the reference signal generating device generates a reference signal which is equal to the amplitude, the frequency and the phase of the narrow-band interference signal according to the amplitude, the frequency and the phase information of the narrow-band interference signal. The offset device can comprise two input ends which are respectively connected with the output end of the signal generating device and the output end of the reference signal generating device, respectively receive the high-frequency current signal output by the signal generating device and the reference signal output by the reference signal generating device, and can filter the narrow-band interference signal existing in the high-frequency current signal by subtracting the high-frequency current signal from the reference signal to obtain the partial discharge high-frequency current signal.
The anti-interference detection system of partial discharge high frequency current that this embodiment provided, this system includes signal generation device, reference signal generation device and cancellation device, this system can be according to the high frequency current signal that signal generation device produced, through reference signal generation device initiative generate one way with the reference signal of interference signal same frequency in phase, carry out difference operation through cancellation device and the partial discharge high frequency current signal that has superpose interference signal, realize interference signal's elimination, compare in adopting software filtering interference signal among the prior art, this system has reduced the operation complexity, interference signal's filtering efficiency has been improved.
As an alternative embodiment of the present invention, as shown in fig. 2, the signal generating device 11 includes a high-frequency current sensor 111; the reference signal generating device 12 includes a multiplier 121, a low-pass filter 122, a voltage-controlled oscillator 123, and a phase shifter 124 connected in sequence; a first input terminal of the reference signal generating means 12, arranged at a first terminal of the multiplier 121; a second input terminal of the reference signal generating means 12, arranged at a second terminal of the multiplier 121; the output of the reference signal generating means 12 is arranged at the output of the phase shifter 124.
Illustratively, the high-frequency current sensor is used for outputting a high-frequency current signal, and since a narrow-band interference usually exists in a field where the high-frequency current sensor is installed, the narrow-band interference signal is superposed in the high-frequency current signal output by the high-frequency current sensor, that is, the high-frequency current signal output by the high-frequency current sensor includes a partial discharge high-frequency current signal and a narrow-band interference signal.
The reference signal generating device is composed of a multiplier, a low-pass filter, a voltage-controlled oscillator and a phase shifter which are connected in sequence, and a first input end of the reference signal generating device is arranged at a first end of the multiplier; the second input end of the reference signal generating device is arranged at the second end of the multiplier; and the output end of the reference signal generating device is arranged at the output end of the phase shifter. The signal generating device outputs the high-frequency current signal to a first input end of the reference signal generating device, a second input end of the reference signal generating device is used for receiving other signals, the reference signal is generated by the simultaneous action of the high-frequency current signal received by the first input end, and the output end of the reference signal generating device outputs the reference signal to the counteracting device.
As an alternative embodiment of the present invention, as shown in fig. 2, the cancellation means 13 includes a subtractor 131; the first terminal of the subtracter 131 is connected to the output terminal of the signal generating device 11, the second output terminal of the subtracter 131 is connected to the output terminal of the reference signal generating device 12, and the high-frequency current signal is subtracted from the reference signal to eliminate the interference signal.
Illustratively, the first end of the cancellation device receives the high-frequency current signal output by the signal generation device, the second end of the cancellation device receives the reference signal output by the reference signal generation device, the high-frequency current signal and the reference signal are subtracted, namely, the narrow-band interference signal existing in the high-frequency current signal is eliminated, and the partial discharge high-frequency current signal is output.
As an alternative embodiment of the present invention, as shown in fig. 2, a multiplier is disposed between the signal generating device and the low pass filter, a first end of the multiplier is connected to the output end of the signal generating device, and a second end of the multiplier is connected to the output end of the voltage controlled oscillator, and is configured to output a first output signal including a difference frequency signal and a sum frequency signal.
Illustratively, the high-frequency current signal U11 output by the signal output terminal of the signal generating device, i.e. the high-frequency current sensor, is a superposition of the partial discharge high-frequency current signal and the narrow-band interference signal, which can be expressed as:
U 11 ＝U s +U int sin(ω int t+θ int )
wherein, U 11 For outputting signals from high-frequency current sensors, U s For partial discharge of high-frequency current signals, U int For the amplitude, omega, of the narrow-band interfering signal int Is the center frequency, theta, of a narrow-band interference signal int The initial phase of the narrowband interfering signal, t is time.
The output terminal of the high frequency current sensor is connected to the first terminal of the multiplier, and is multiplied by the output signal of the voltage controlled oscillator connected to the second terminal of the multiplier, then the first output signal output by the output terminal of the multiplier can be expressed as:
wherein, U 23 For the output signal of the multiplier, U int For the amplitude, omega, of the narrow-band interfering signal int Is the center frequency, theta, of a narrowband interfering signal int For the initial phase, U, of a narrowband interfering signal vco Amplitude, omega, of output signal for voltage-controlled oscillator vco For the centre frequency, theta, of the output signal of the voltage-controlled oscillator vco T is the time for the initial phase of the vco output signal. Due to the amplitude U of the narrow-band interference signal int Amplitude U far greater than partial discharge high-frequency current signal s Thus, a partial discharge high-frequency current signal can be connected withThe product of the voltage controlled oscillator output signal is omitted.
As an alternative embodiment of the present invention, as shown in fig. 2, the low-pass filter is disposed between the multiplier and the voltage-controlled oscillator, and is connected to the output terminal of the multiplier, for filtering the complex frequency signal in the first output signal to obtain the second output signal.
Illustratively, the multiplier outputs the first output signal to a low-pass filter, and the filter filters out the complex frequency signal in the first output signal to obtain a second output signal, which may be expressed as:
wherein, U 32 Is the output signal of a low-pass filter, U int Is the amplitude, omega, of the narrow-band interfering signal int Is the center frequency, theta, of a narrow-band interference signal int For the initial phase, U, of a narrowband interfering signal vco Is the amplitude of the output signal of the voltage controlled oscillator, omega vco Is the center frequency, theta, of the output signal of the voltage-controlled oscillator vco Is the initial phase of the output signal of the voltage controlled oscillator, t is time.
As an alternative embodiment of the present invention, as shown in fig. 2, a voltage-controlled oscillator is disposed between the low-pass filter and the phase shifter, and is connected to the output end of the low-pass filter, the low-pass filter controls the center frequency of the output signal of the voltage-controlled oscillator to be equal to the center frequency of the interference signal, adjusts the amplitude of the output signal of the voltage-controlled oscillator to be equal to the amplitude of the interference signal, and generates a third output signal having the same amplitude and the same frequency as the interference signal.
Illustratively, the output signal of the voltage controlled oscillator may be expressed as:
U 42 ＝U vco sin(ω vco t+θ vco )
wherein, U 42 For the output signal of the voltage-controlled oscillator, U vco Is the amplitude, omega, of the output signal of the voltage-controlled oscillator vco Being the center frequency of the output signal of the voltage controlled oscillator,output signal U of low-pass filter 32 Control of theta vco T is the time for the initial phase of the output signal of the voltage controlled oscillator.
The center frequency of the output signal of the voltage-controlled oscillator is controlled by the output signal U of the low-pass filter 32 Control of (a) (. Omega.) vco Can be expressed as:
ω vco ＝ω 0 +KU 32
wherein, ω is 0 Is an initial value of the center frequency of the output signal of the voltage-controlled oscillator, K is a control coefficient, U 32 Is the output signal of the low pass filter, t is time.
It follows that the output signal U of the low-pass filter is not constant 32 With time variation, the center frequency omega of the output signal of the voltage-controlled oscillator vco Will also vary with time until the center frequency omega of the output signal of the voltage controlled oscillator vco With the centre frequency omega of the narrow-band interfering signal int Are equal, at this time, U 32 No longer varying with time, center frequency omega of output signal of corresponding voltage-controlled oscillator vco And no longer changes with time, i.e. the output signal of the voltage controlled oscillator is locked to the narrowband interfering signal. After the output signal of the voltage-controlled oscillator is locked to the narrowband interference signal, the third output signal output by the voltage-controlled oscillator may be represented as:
U 51 ＝U vco sin(ω int t+θ vco )
wherein, U 51 For the output signal of the phase shifter, U vco Is the amplitude, omega, of the output signal of the voltage-controlled oscillator int Is the center frequency, theta, of a narrowband interfering signal int The initial phase of the narrowband interfering signal, t is time.
If the amplitude U of the output signal of the voltage-controlled oscillator is adjusted vco Adjusted to amplitude U of interference signal with narrow band int And when the first output signal and the second output signal are equal, the third output signal can be completely equal to the narrow-band interference signal in both amplitude and frequency.
As an alternative embodiment of the present invention, as shown in fig. 2, a phase shifter is disposed between the voltage-controlled oscillator and the cancellation device, and connected to the output terminal of the voltage-controlled oscillator, for performing phase compensation on the third output signal, where the compensation amount of the phase compensation is a difference between an initial phase of the interference signal and an initial phase of the third output signal, and generating a reference signal having the same amplitude, the same frequency and the same phase as the interference signal.
Illustratively, the voltage-controlled oscillator inputs the third output signal to the phase shifter, and the input signal of the phase shifter may be expressed as:
U 51 ＝U vco sin(ω int t+θ vco )
the phase shifter compensates the phase of the third output signal by the difference between the initial phase of the narrowband interference signal and the initial phase of the output signal of the voltage-controlled oscillator, and the reference signal output by the phase shifter can be expressed as:
U 52 ＝U vco sin(ω int t+θ int )
wherein, U 52 For the output signal of the phase shifter, U vco Is the amplitude, omega, of the output signal of the voltage-controlled oscillator int Is the center frequency, theta, of a narrow-band interference signal int The initial phase of the narrowband interfering signal, t is time.
If the amplitude U of the output signal of the voltage-controlled oscillator is adjusted vco Adjusted to amplitude U of interference signal with narrow band int When they are equal, the reference signal can be completely equal to the narrowband interference signal in amplitude, frequency and phase.
The cancellation means subtracts the received high frequency current signal from the reference signal, and the output signal of the cancellation means, i.e. the subtractor, can be expressed as:
U 63 ＝U s +(U int -U vco )sin(ω int t+θ int )
wherein, U 63 Is the output signal of the subtractor, U vco Is the amplitude, U, of the output signal of the voltage-controlled oscillator int For the amplitude, omega, of the narrow-band interfering signal int Is the center frequency, theta, of a narrow-band interference signal int The initial phase of the narrowband interfering signal, t is time. Obviously when pressingAmplitude U of output signal of controlled oscillator vco Adjusted to amplitude U of interference signal with narrow band int When they are equal, the narrowband interference signal can be completely eliminated.
Example 2
The embodiment provides a partial discharge high-frequency current anti-interference detection method, which is applied to a partial discharge high-frequency current anti-interference detection system, and as shown in fig. 3, the method includes:
and S21, acquiring a high-frequency current signal of the signal generating device, wherein the high-frequency current signal comprises a partial discharge high-frequency current signal and a superposed interference signal.
The signal generating device may be, for example, a high-frequency current sensor, and the high-frequency current signal may be obtained by the high-frequency current sensor, and the high-frequency current signal includes a partial discharge high-frequency current signal and a superimposed interference signal. For details, please refer to the description related to the signal generating device 11 in any of the above system embodiments, which is not described herein again.
And S22, inputting the high-frequency current signal into the reference signal generating device, processing the high-frequency current signal, and generating a reference signal which is equal to the amplitude, the phase and the frequency of the interference signal.
Illustratively, according to amplitude, phase and frequency information of an interference signal existing in the high-frequency current signal, the received high-frequency current signal is processed, and a reference signal which is equal to the auxiliary signal, the phase and the frequency of the interference signal is automatically generated.
As an optional embodiment of the present invention, the step S22 includes:
firstly, an initial signal of a reference signal generating device is obtained, and a high-frequency current signal is multiplied by the initial signal to obtain a multiplied signal. For details, please refer to the description related to the multiplier of the reference signal generating device 12 in any of the above system embodiments, which is not repeated herein.
And secondly, filtering the multiplied signal to obtain a filtered signal. For details, please refer to the description related to the low-pass filter of the reference signal generating apparatus 12 in any of the above system embodiments, which is not repeated herein.
And secondly, obtaining an oscillation signal according to the filtering signal, wherein the frequency of the oscillation signal corresponds to the filtering signal. For details, please refer to the description related to the voltage controlled oscillator of the reference signal generating device 12 in any of the above system embodiments, which is not repeated herein.
And secondly, controlling the central frequency of the oscillation signal to be equal to the central frequency of the interference signal to obtain a control signal. For details, please refer to the description related to the voltage controlled oscillator of the reference signal generating device 12 in any of the above system embodiments, which is not repeated herein.
And secondly, adjusting the amplitude of the control signal to be equal to that of the interference signal to obtain an adjusting signal. For details, please refer to the description related to the voltage controlled oscillator of the reference signal generating device 12 in any of the above system embodiments, which is not repeated herein.
Compensating the phase of the adjusting signal to obtain a reference signal which is equal to the amplitude, the phase and the frequency of the interference signal; the compensation amount of the phase is a difference between an initial phase of the interference signal and an initial phase of the adjustment signal. For details, please refer to the description related to the phase shifter of the reference signal generating device 12 in any of the above system embodiments, which is not repeated herein.
And S23, obtaining a partial discharge high-frequency current signal according to the high-frequency current signal and the reference signal. For details, please refer to the description related to the cancellation device 13 in any of the above system embodiments, which is not repeated herein.
According to the anti-interference detection method for the partial discharge high-frequency current, the high-frequency current signal of the signal generating device is obtained, and the high-frequency current signal comprises the partial discharge high-frequency current signal and the superposed interference signal; inputting the high-frequency current signal into a reference signal generating device, processing the high-frequency current signal, and generating a reference signal which is equal to the amplitude, the phase and the frequency of the interference signal; and obtaining a partial discharge high-frequency current signal according to the high-frequency current signal and the reference signal. The anti-interference detection method for the partial discharge high-frequency current reduces the operation complexity and improves the filtering efficiency of interference signals.
As an optional implementation manner of the present invention, the step S23 includes: and performing difference operation on the high-frequency current signal and the reference signal, and eliminating an interference signal superposed in the high-frequency current signal to obtain a partial discharge high-frequency current signal. For details, please refer to the description related to the cancellation device 13 in any of the above system embodiments, which is not repeated herein.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (4)
1. An anti-interference detection system for partial discharge high-frequency current, comprising:
the signal generating device is used for outputting a high-frequency current signal, and the high-frequency current signal comprises a partial discharge high-frequency current signal and an interference signal;
the reference signal generating device is used for outputting a reference signal with the amplitude, the frequency and the phase equal to the interference signal;
the offset device is used for filtering interference signals in the high-frequency current signals according to the high-frequency current signals and the reference signals to obtain partial discharge high-frequency current signals;
wherein the signal generating device comprises a high frequency current sensor; the reference signal generating device comprises a multiplier, a low-pass filter, a voltage-controlled oscillator and a phase shifter which are connected in sequence; a first input terminal of the reference signal generating device, which is arranged at a first terminal of the multiplier; a second input terminal of the reference signal generating device, which is arranged at a second terminal of the multiplier; the output end of the reference signal generating device is arranged at the output end of the phase shifter;
the multiplier is arranged between the signal generating device and the low-pass filter, a first end of the multiplier is connected with an output end of the signal generating device, and a second end of the multiplier is connected with an output end of the voltage-controlled oscillator and used for outputting a first output signal containing a difference frequency signal and a sum frequency signal; the amplitude of the interference signal is far larger than that of the partial discharge high-frequency current signal, and the product of the partial discharge high-frequency current signal and the output signal of the voltage-controlled oscillator is omitted;
the low-pass filter is arranged between the multiplier and the voltage-controlled oscillator, is connected with the output end of the multiplier, and is used for filtering a frequency-synthesized signal in the first output signal to obtain a second output signal;
the voltage-controlled oscillator is arranged between the low-pass filter and the phase shifter and is connected with the output end of the low-pass filter, the low-pass filter controls the center frequency of an output signal of the voltage-controlled oscillator to be equal to the center frequency of the interference signal, the amplitude of the output signal of the voltage-controlled oscillator is adjusted to be equal to the amplitude of the interference signal, and a third output signal with the same amplitude and the same frequency as the interference signal is generated;
and the phase shifter is arranged between the voltage-controlled oscillator and the cancellation device, is connected with the output end of the voltage-controlled oscillator, and is used for performing phase compensation on the third output signal, wherein the compensation amount of the phase compensation is the difference between the initial phase of the interference signal and the initial phase of the third output signal, and generates a reference signal which has the same amplitude, frequency and phase as the interference signal.
2. The system of claim 1, wherein said cancellation means comprises a subtractor;
the first end of the subtracter is connected with the output end of the signal generating device, the second output end of the subtracter is connected with the output end of the reference signal generating device, and the high-frequency current signal is subtracted from the reference signal to eliminate the interference signal.
3. An anti-interference detection method for partial discharge high-frequency current, which is applied to the anti-interference detection system for partial discharge high-frequency current according to claim 1 or 2, and comprises:
acquiring a high-frequency current signal of a signal generating device, wherein the high-frequency current signal comprises a partial discharge high-frequency current signal and a superposed interference signal;
inputting the high-frequency current signal to a reference signal generating device, processing the high-frequency current signal, and generating a reference signal which is equal to the amplitude, the phase and the frequency of the interference signal;
obtaining the partial discharge high-frequency current signal according to the high-frequency current signal and the reference signal;
wherein the processing the high-frequency current signal to generate a reference signal equal to the amplitude, the phase and the frequency of the interference signal comprises: acquiring an initial signal of a second input device, and multiplying the high-frequency current signal by the initial signal to obtain a multiplied signal; filtering the multiplied signal to obtain a filtered signal; obtaining an oscillation signal according to the filtering signal, wherein the frequency of the oscillation signal corresponds to the filtering signal; controlling the central frequency of the oscillation signal to be equal to the central frequency of the interference signal to obtain a control signal; adjusting the amplitude of the control signal to be equal to the amplitude of the interference signal to obtain an adjustment signal; compensating the phase of the adjusting signal to obtain a reference signal which is equal to the amplitude, the phase and the frequency of the interference signal; the compensation amount of the phase is the difference between the initial phase of the interference signal and the initial phase of the adjusting signal.
4. The method of claim 3, wherein said deriving the partial discharge high frequency current signal from the high frequency current signal and the reference signal comprises:
and performing difference operation on the high-frequency current signal and the reference signal, and eliminating the interference signal superposed in the high-frequency current signal to obtain the partial discharge high-frequency current signal.
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