Two-dimensional photoelectric array signal processing method for acquiring discharge position and spectral information

Abstract

The application discloses a two-dimensional photoelectric array signal processing method for obtaining discharge positions and spectral information. In the method, optical filtering coating or covering filters are arranged in the row direction of an m*m two-dimensional photoelectric array to form m columns of spectral receiving areas. The unit outputs of each column and each row of the two-dimensional photoelectric array are led out in parallel and connected to m summation operation circuits respectively. Each summation operation circuit outputs the summation of each unit signal I(i, j) in the m columns and the summation of each unit signal I(i, j) in the m rows. A central processing unit processes the m pulse signals collected in T1 and T2 periods. The pulse full waveform is extracted, and the pulse peak value and the peak time are extracted. The spectral pulse signals and the position pulse signals are recorded in a memory. The phase map is used for statistical analysis to obtain the phase statistical map of the spectral band and the phase statistical map of the position.

Description

Technical Field

[0001] This invention belongs to the field of partial discharge detection technology for power equipment, and in particular, it is a two-dimensional photoelectric array signal processing method for acquiring discharge location and spectral information. Background Technology

[0002] Insulation safety of power equipment is a fundamental prerequisite for power grid safety; however, the failure rate caused by abnormal discharge of equipment remains high year after year. Abnormal discharge in power equipment is both a factor that accelerates insulation degradation and failure and a key indicator of early insulation faults. Therefore, partial discharge detection is not only a necessary assessment item in factory and field testing of equipment, but also an important technical means for equipment condition monitoring. For partial discharge detection, efficient defect identification (qualitative), reliable quantitative analysis (quantitative), and accurate defect tracing (localization) are the three core goals pursued by researchers and maintenance personnel. Although various partial discharge detection methods, such as pulse current methods, ultra-high frequency methods, and ultrasonic methods, have achieved significant results in equipment operation and maintenance, the increasing complexity of power systems and wireless communication network standards, along with interference problems such as electromagnetic waves, acoustic waves, and harmonics, pose significant challenges to the qualitative, quantitative, and localization aspects of existing discharge detection methods. There is an urgent need to improve the confidence and diagnostic effectiveness of partial discharge detection through new principles, methods, and technologies.

[0003] The information disclosed in the background section is only intended to enhance the understanding of the background of the present invention, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention proposes a two-dimensional photoelectric array signal processing method for acquiring discharge location and spectral information. This method utilizes the same photoelectric array to acquire both discharge location and spectral information, solving the problems of built-in optical signal acquisition devices lacking integrated photoelectric system design, resulting in large sensor size and poor reliability; the inability to simultaneously acquire discharge location and spectral information, leading to a lack of discharge diagnostic information; and the inability of existing photoelectric array signal processing circuits to operate in both discharge location and spectral recognition modes, which significantly increases sensor hardware costs by using two independent systems.

[0005] The objective of this invention is achieved through the following technical solution: a two-dimensional photoelectric array signal processing method for acquiring discharge location and spectral information includes:

[0006] Optical filter coatings or covers are applied along the row directions of an m×m two-dimensional optoelectronic array to form m columns of spectral receiving regions. The center bands of each column are denoted as: λ1, λ2, ..., λ m ;

[0007] The outputs of each column of the two-dimensional photoelectric array are connected in parallel and then connected to m summing circuits. Each summing circuit outputs the signal I(i,j) of each unit in the m columns, and the sums are obtained to obtain the summation result I. j =∑I i，j , i = 1: m, the summation results constitute the discharge spectral intensity column vector I. j , j = 1: m, which is the spectral intensity component information I(λ) of the discharge light signal. j ) = I j ;

[0008] The outputs of each row of the two-dimensional photoelectric array are connected in parallel and then connected to m summing circuits. Each summing circuit outputs the signal I(i,j) of each cell in the m rows, which are then summed to obtain the summation result. i =∑I i，j , j = 1: m, the summation results constitute the discharge position row vector I i i = 1:m, that is, the position component information I(n) of the discharge light signal. i ) = I i ;

[0009] The central processing unit controls the switch control circuit SW, and within period T1, the discharge spectral intensity column vector signal I output by the two-dimensional photoelectric array. j The signal is input to m-channel spectral signal processing circuits for synchronous processing, and the output signal of the m-channel spectral signal processing circuits is input to m-channel digital sampling circuits for synchronous acquisition; within period T2, the discharge position row vector signal I output by the two-dimensional photoelectric array... i The signal is connected to the m-channel position signal processing circuit for synchronous processing, and the output signal of the m-channel position signal processing circuit is connected to the m-channel digital sampling circuit for synchronous acquisition.

[0010] The central processing unit processes the m pulse signals acquired within the T1 and T2 cycles, including extracting the full waveform of the pulse, extracting the pulse peak value and peak time, recording the spectral pulse signal in memory as an array {t, q}, and recording the position pulse signal in memory as an array {t, n}.

[0011] Statistical analysis of the phase spectrum is performed on the arrays {t, q} and {t, n} to obtain the phase statistical spectrum of m spectral bands and the phase statistical spectrum of m positions.

[0012] In the two-dimensional photoelectric array signal processing method for acquiring discharge location and spectral information, each unit of the two-dimensional photoelectric array is composed of silicon photomultiplier tubes.

[0013] In the two-dimensional photoelectric array signal processing method for obtaining discharge location and spectral information, both the T1 period and the T2 period are integer multiples of the power frequency AC voltage period.

[0014] In the two-dimensional photoelectric array signal processing method for obtaining discharge location and spectral information, the lengths of the T1 and T2 periods vary according to the magnitude of the average intensity of the light signal monitored within a single power frequency AC voltage cycle.

[0015] In the two-dimensional photoelectric array signal processing method for obtaining discharge location and spectral information, the number of rows or columns (m) of the m×m two-dimensional photoelectric array is not less than 2.

[0016] Compared with existing technologies, this invention has the following advantages: Through IBS filter coating and dual-channel integration circuit design, this invention achieves functional multiplexing of the photoelectric array; with its two-dimensional photoelectric array signal acquisition time-division multiplexing circuit design, this invention achieves simultaneous acquisition of discharge location information and spectral information on the two-dimensional photoelectric array while using fewer photoelectric signal processing circuits and acquisition channels. It can operate in both discharge positioning and spectral recognition modes, reducing hardware costs and improving sensor sensing capabilities. Utilizing the same photoelectric array to acquire discharge location information and spectral information results in a small sensor size and high reliability. Attached Figure Description

[0017] Various other advantages and benefits of the present invention will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0018] In the attached diagram:

[0019] Figure 1 This is a schematic diagram of a two-dimensional optoelectronic array readout multiplexing circuit for a two-dimensional optoelectronic array signal processing method for acquiring discharge location and spectral information according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of a two-dimensional photoelectric array signal acquisition time-division multiplexing circuit for a two-dimensional photoelectric array signal processing method for acquiring discharge location and spectral information according to an embodiment of the present invention;

[0021] Figures 3(a) and 3(b) are schematic diagrams of discharge spectrum-position phase statistics of a two-dimensional photoelectric array signal processing method for obtaining discharge position and spectral information according to an embodiment of the present invention. Figure 3(a) is a phase statistics spectrum of the spectral band, and Figure 3(b) is a position phase statistics spectrum.

[0022] The present invention will be further explained below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0023] Specific embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0024] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions are preferred embodiments for carrying out the invention; however, these descriptions are for the purpose of understanding the general principles of the specification and are not intended to limit the scope of the invention. The scope of protection of this invention is determined by the appended claims.

[0025] To facilitate understanding of the embodiments of the present invention, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings do not constitute a limitation on the embodiments of the present invention.

[0026] In one embodiment, such as Figures 1 to 3(b) As shown, the two-dimensional photoelectric array signal processing method for acquiring discharge location and spectral information includes,

[0027] Silicon photomultiplier tubes receive photon signals to construct a multi-normal intensity sensing linear array, obtaining the intensity of each normal light signal to acquire discharge location information.

[0028] Optical filter coatings or covers are applied along the row directions of an m×m two-dimensional optoelectronic array to form m columns of spectral receiving regions. The center bands of each column are denoted as: λ1, λ2, ..., λ m ;

[0029] The outputs of each column of the two-dimensional photoelectric array are connected in parallel and then connected to m summing circuits. Each summing circuit outputs the signal I(i,j) of each unit in the m columns, and the sums are obtained to obtain the summation result I. j =∑I i，j , i = 1: m, the summation results constitute the discharge spectral intensity column vector I. j , j = 1: m, which is the spectral intensity component information I(λ) of the discharge light signal. j ) = Ij ;

[0030] The outputs of each row of the two-dimensional photoelectric array are connected in parallel and then connected to m summing circuits. Each summing circuit outputs the signal I(i,j) of each cell in the m rows, which are then summed to obtain the summation result. i =∑I i，j , j = 1: m, the summation results constitute the discharge position row vector I i i = 1:m, that is, the position component information I(n) of the discharge light signal. i ) = I i ;

[0031] The central processing unit controls the switch control circuit SW, and within period T1, the discharge spectral intensity column vector signal I output by the two-dimensional photoelectric array. j The signal is input to m-channel spectral signal processing circuits for synchronous processing, and the output signal of the m-channel spectral signal processing circuits is input to m-channel digital sampling circuits for synchronous acquisition; within period T2, the discharge position row vector signal I output by the two-dimensional photoelectric array... i The signal is connected to the m-channel position signal processing circuit for synchronous processing, and the output signal of the m-channel position signal processing circuit is connected to the m-channel digital sampling circuit for synchronous acquisition.

[0032] The central processing unit processes the m pulse signals acquired within the T1 and T2 cycles, including extracting the full waveform of the pulse, extracting the pulse peak value and peak time, recording the spectral pulse signal in memory as an array {t, q}, and recording the position pulse signal in memory as an array {t, n}.

[0033] Statistical analysis of the phase spectrum is performed on the arrays {t, q} and {t, n} to obtain the phase statistical spectrum of m spectral bands and the phase statistical spectrum of m positions.

[0034] In a preferred embodiment of the two-dimensional photoelectric array signal processing method for acquiring discharge location and spectral information, the two-dimensional photoelectric array is a silicon photomultiplier tube.

[0035] In a preferred embodiment of the two-dimensional photoelectric array signal processing method for obtaining discharge location and spectral information, a silicon photomultiplier tube receives photon signals to construct a multi-normal intensity sensing linear array, and obtains the intensity of each normal light signal to obtain discharge location information.

[0036] In a preferred embodiment of the two-dimensional photoelectric array signal processing method for acquiring discharge location and spectral information, the T1 period is 20 times the 50Hz power frequency period (i.e., 1 second), and the T2 period is 40 times the 50Hz power frequency period (i.e., 2 seconds).

[0037] In a preferred embodiment of the two-dimensional photoelectric array signal processing method for acquiring discharge location and spectral information, the m×m two-dimensional photoelectric array is an 8×8 silicon photomultiplier tube array.

[0038] In one embodiment, an 8×8 silicon photomultiplier tube array is used and its surface is treated with a filter coating to form a two-dimensional photoelectric array (8×8). If the present invention is not used to obtain discharge location information and spectral information, the prior art proceeds as follows: a 64-channel analog signal processing circuit, a digital-to-analog converter circuit, a memory and a central processing unit are used to synchronously process the output signals of each unit of the two-dimensional photoelectric array (8×8). This method requires powerful parallel signal processing hardware units and computing resources to support it. Its complex circuit scale, heat dissipation requirements and hardware costs can no longer meet the stability and economic requirements of actual online monitoring systems.

[0039] The photoelectric signal obtained by the two-dimensional photoelectric array is binary, containing both spectral components and normal intensity components.

[0040] This invention utilizes only 8 channels (instead of 64) to acquire spectral and normal intensity information, avoiding the instability caused by multi-channel parallel processing. Specifically,

[0041] On the selected 8×8 silicon photomultiplier tube array, optical filter coating or cover filter is applied in the array row direction to form 8 columns of spectral receiving regions, and the center band of each column is denoted as: λ1, λ2, ..., λ8;

[0042] The outputs of each column of the two-dimensional photoelectric array are connected in parallel and then connected to eight summing circuits. Each summing circuit outputs the signal (I(i,j)) of each of the eight columns, and the sums are calculated to obtain the summation result (Ii). j =∑I i，j (i = 1:8), the summation results constitute the discharge spectral intensity column vector (I j (j = 1:8), which is the spectral intensity component information of the discharge light signal (I λ1 I λ2 ,...,I λ8 );

[0043] The outputs of each row of the two-dimensional photoelectric array are connected in parallel and then connected to m summing circuits. Each summing circuit outputs the signal (I(i,j)) of each cell in the m rows, and the sums are obtained to obtain the summation result (Ii). i =∑I i，j (j=1:m), as shown in the appendix Figure 1 The summation results constitute the row vector of discharge location (I). i i = 1:m), that is, the position component information of the discharge light signal (I n1 I n2,...,I n8 );

[0044] The central processing unit controls the switch control circuit (SW) to make T1 = 20ms and T2 = 2ms. Within the T1 period, the discharge spectral intensity column vector signal (I) output by the two-dimensional photoelectric array is... j (j=1:8) are input to 8-channel spectral signal processing circuits for synchronous processing, and the output signals of the 8-channel spectral signal processing circuits are input to 8-channel digital sampling circuits for synchronous acquisition; within the T2 period, the discharge position row vector signal (I) output by the two-dimensional photoelectric array i (i=1:m) are connected to an 8-channel position signal processing circuit for synchronous processing, and the output signal of the 8-channel position signal processing circuit is connected to an 8-channel digital sampling circuit for synchronous acquisition.

[0045] A central processing unit is used to extract the pulse peak and peak time of the 8-channel sampled digital signals within the T1 and T2 periods, forming arrays {t, q} and {t, n} respectively, and recording them in memory;

[0046] Furthermore, the phase spectrum is used to perform statistical analysis on the arrays {t, q} and {t, n} to obtain the phase statistical spectrum of 8 spectral bands and the phase statistical spectrum of 8 positions, as shown in Figure 3(a) and Figure 3(b).

[0047] In one embodiment, the timing switching between T1 and T2 cycles is achieved through program control of the switch control circuit (SW) by the central processing unit.

[0048] In one embodiment, the horizontal axis of the phase statistics graph of the spectral band is the spectral pulse rpd, and the vertical axis is the spectral intensity.

[0049] In one embodiment, the horizontal axis of the position phase statistics spectrum represents the photon number phase statistics, and the vertical axis represents the normal intensity.

[0050] In one embodiment, each unit of the two-dimensional photoelectric array is composed of a silicon photomultiplier tube.

[0051] In one embodiment, both the T1 period and the T2 period are integer multiples of the power frequency AC voltage period.

[0052] In one embodiment, the lengths of the T1 and T2 periods vary based on the average intensity of the optical signal monitored within a single power frequency AC voltage cycle.

[0053] In one embodiment, the number of rows or columns (m) of the m×m two-dimensional optoelectronic array is not less than 2.

[0054] Although embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments and application fields described above. The specific embodiments described above are merely illustrative and instructive, and not restrictive. Those skilled in the art can make many other forms based on the guidance of this specification and without departing from the scope of protection of the claims of the present invention, and all of these are within the scope of protection of the present invention.

Claims

1. A two-dimensional photoelectric array signal processing method for acquiring discharge location and spectral information, characterized in that, It includes the following steps: Optical filter coatings or covers are applied along the row directions of an m×m two-dimensional optoelectronic array to form m columns of spectral receiving regions. The center bands of each column are denoted as: λ1, λ2, …, λ m ; The outputs of each column of the two-dimensional photoelectric array are connected in parallel and then connected to m summing circuits. Each summing circuit outputs the signal I(i,j) of each unit in the m columns, and the sums are obtained to obtain the summation result I. j =∑I i,j The summation results, i=1:m, constitute the discharge spectral intensity column vector I. j , j=1:m, which is the spectral intensity component information I(λ) of the discharge light signal. j )=I j ; The outputs of each row of the two-dimensional photoelectric array are connected in parallel and then connected to m summing circuits. Each summing circuit outputs the signal I(i,j) of each cell in the m rows, which are then summed to obtain the summation result. i =∑I i,j The summation results, j=1:m, constitute the row vector I of the discharge position. i i=1:m, that is, the position component information I(n) of the discharge optical signal. i )=I i ; The central processing unit controls the switch control circuit SW, and within period T1, the discharge spectral intensity column vector signal I output by the two-dimensional photoelectric array. j The signal is input to m-channel spectral signal processing circuits for synchronous processing, and the output signal of the m-channel spectral signal processing circuits is input to m-channel digital sampling circuits for synchronous acquisition; within period T2, the discharge position row vector signal I output by the two-dimensional photoelectric array... i The signal is connected to the m-channel position signal processing circuit for synchronous processing, and the output signal of the m-channel position signal processing circuit is connected to the m-channel digital sampling circuit for synchronous acquisition. The central processing unit processes the m pulse signals acquired within periods T1 and T2, including extracting the full waveform of the pulse, extracting the pulse peak value and peak time, recording the spectral pulse signal in memory as an array {t, q}, and recording the position pulse signal in memory as an array {t, n}. Statistical analysis of the phase spectrum is performed on the arrays {t, q} and {t, n} to obtain the phase statistical spectrum of m spectral bands and the phase statistical spectrum of m positions.

2. The two-dimensional photoelectric array signal processing method for acquiring discharge location and spectral information according to claim 1, characterized in that, Each unit of the two-dimensional optoelectronic array is composed of silicon photomultiplier tubes.

3. The two-dimensional photoelectric array signal processing method for acquiring discharge location and spectral information according to claim 1, characterized in that, Both the T1 period and the T2 period are integer multiples of the power frequency AC voltage period.

4. The two-dimensional photoelectric array signal processing method for acquiring discharge location and spectral information according to claim 1, characterized in that, The lengths of the T1 and T2 periods vary depending on the average intensity of the optical signal monitored within a single power frequency AC voltage cycle.

5. The two-dimensional photoelectric array signal processing method for acquiring discharge location and spectral information according to claim 1, characterized in that, The number of rows or columns m in an m×m two-dimensional optoelectronic array is not less than 2.

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