Interference signal processing system for nuclear power device

Abstract

An interference signal processing system for a nuclear power device relates to the technical field of data processing and comprises a data acquisition module, an instrument signal analysis module, a central control module and a signal processing algorithm module. The instrument signal analysis module is used for acquiring current signals of a plurality of instrument devices in the nuclear power device, decomposing the plurality of current signals and filtering the decomposed current signals; the data acquisition module is used for analyzing the current signal output by the instrument signal analysis module; the central control module is used for controlling the instrument signal module to filter the corresponding current signal again when the analysis result is abnormal; the signal processing algorithm module is used for receiving the current signal filtered by the instrument signal analysis module each time and judging the condition of an interference source in a plurality of pieces of instrument equipment after processing; and the position of the interference source can be accurately positioned.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular to an interference signal processing system for a nuclear power plant. Background Art

[0002] In nuclear power plants, a dense data acquisition method is often used in which a controller and an acquisition module are used together to collect operating or starting voltage and current of mechanical equipment such as pumps and valves, as well as temperature and pressure data of each circuit of a pressurized water reactor. The acquisition system has a large number of data channels. The acquisition module usually uses an analog current acquisition (AI) module to collect 4-20mA DC current, and then calculates the corresponding actual instrument signal.

[0003] However, in the actual application of nuclear power plants, due to the frequent start-stop or operation of various types of high-power equipment such as pumps and large-diameter valves, the electromagnetic interference generated will cause abnormal instrument input signals or false signals. As a result, the acquisition module will generate coupled interference current in the loop under the influence of electromagnetic interference from surrounding high-power equipment, resulting in large errors in the instrument signals obtained, seriously affecting the operator's correct judgment of the actual working conditions, or causing false alarms in the instrumentation and control system and false start-up of interlocking protection, affecting the normal operation of the nuclear power plant, and forming a serious safety hazard.

[0004] Traditionally, the cables in the acquisition module are replaced with instrumentation cables with metal shielding to shield low-frequency current interference. However, the penetration depth of high-frequency interference signals is much greater than the thickness of the instrumentation cable shielding, resulting in very limited instrumentation cable shielding effect. Summary of the invention

[0005] The object of the present invention is to provide an interference signal processing system for a nuclear power plant, which can accurately locate the position of the interference source.

[0006] The present invention is achieved through the following technical solutions:

[0007] An interference signal processing system for a nuclear power plant includes a data acquisition module, an instrument signal analysis module, a central control module and a signal processing algorithm module;

[0008] The instrument signal analysis module is used to obtain current signals of multiple instrument devices in the nuclear power plant, decompose the multiple current signals, and filter the decomposed current signals;

[0009] The data acquisition module is used to analyze the current signal output by the instrument signal analysis module;

[0010] The central control module is used to control the instrument signal module to filter the corresponding current signal again when the analysis result is abnormal;

[0011] The signal processing algorithm module is used to receive the current signal filtered by the instrument signal analysis module each time, and judge the situation of the interference source in multiple instrument devices after processing.

[0012] Furthermore, the instrument signal analysis module decomposes the multiple current signals through a waveform analysis algorithm to obtain an initial frequency set and an initial current amplitude set corresponding to each frequency.

[0013] Furthermore, the waveform analysis algorithm adopts a wavelet analysis method.

[0014] Furthermore, the instrument signal analysis module uses a filter to filter the decomposed current signal.

[0015] Furthermore, the number of the data acquisition modules is multiple, and each data acquisition module is configured to acquire a current signal from an instrument of a device.

[0016] Furthermore, the data acquisition module uses a frequency domain analysis algorithm to analyze the current signal after filtering.

[0017] Furthermore, the signal processing algorithm module establishes an interference current matrix and an interference signal frequency matrix based on the acquired current signal, thereby determining the location of interference sources in multiple instrument devices and judging whether the interference source is unique.

[0018] Furthermore, a processing method based on the interference signal processing system includes:

[0019] S1. Collect current signals of multiple instruments and equipment in nuclear power plants;

[0020] S2. Performing waveform analysis on the collected current signal to construct an initial current amplitude set and an initial frequency set corresponding to each current value;

[0021] S3. Determine the maximum current in the initial current amplitude concentration and analyze the maximum current;

[0022] S4. If the signal analysis result is abnormal;

[0023] S5. Filter the maximum current in the initial frequency concentration, the central control module sends a filtering instruction to the instrument signal analysis module, and analyzes the maximum current of the filtered current amplitude set;

[0024] S6. If the analysis result is still abnormal, repeat S5 until the signal analysis result is normal;

[0025] S7. If the signal analysis result is normal, the current amplitude set after each filtering and the frequency corresponding to the current amplitude set are output to the signal processing algorithm;

[0026] S8. The signal processing algorithm processes and obtains the situation of the interference source in the instrument equipment.

[0027] Furthermore, the processing method of the S8 signal processing algorithm is:

[0028] S81. Based on the obtained multiple current amplitude sets, establish an interference current matrix and an interference signal frequency matrix, wherein the columns of the two matrices are represented by the serial numbers of multiple equipment instruments, and the rows of the two matrices are represented by the number of filtering times;

[0029] S82. Based on the interference current matrix, the interference degree of each interference device is obtained by sorting the maximum values ​​of each column vector in the matrix, and the position of each interference device is located;

[0030] S83. Based on the interference signal frequency matrix, determine the frequency difference corresponding to each level of interference equipment, and finally determine the number of interference sources in combination with the location of each interference device.

[0031] Furthermore, the frequency difference between the interference devices is 5-10 Hz.

[0032] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0033] The present invention can comprehensively analyze the interference conditions of various instruments and equipment by means of multiple filtering, thereby accurately determining the location of the interference source and further accurately eliminating the interference source. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Example 1

[0041] Combined with Figure 1 The interference signal processing system for a nuclear power plant comprises a data acquisition module, an instrument signal analysis module, a central control module and a signal processing algorithm module;

[0042] The instrument signal analysis module is used to obtain current signals of multiple instrument devices in the nuclear power plant, decompose the multiple current signals, and filter the decomposed current signals;

[0043] It should be noted that the current signal output by the instrument signal analysis module to the data acquisition module for the first time is the initial current signal of the collected multiple instrument devices. After the data acquisition module analyzes that the initial current signal is abnormal and feeds back to the instrument signal analysis module, the instrument signal analysis module will filter it and send it to the data acquisition module again;

[0044] In addition, the instrument signal analysis module decomposes multiple current signals through a waveform analysis algorithm to obtain an initial frequency set and an initial current amplitude set corresponding to each frequency; in particular, the waveform analysis algorithm adopts a wavelet analysis method.

[0045] The waveform analysis algorithm has the following advantages: 1. Multi-resolution analysis.

[0046] That is, wavelet analysis can provide high-resolution analysis in both the time domain and the frequency domain; traditional Fourier transform can only provide information in the frequency domain, while wavelet analysis can simultaneously provide frequency information of the signal at different time points, which is especially important for analyzing transient signals and non-stationary signals; and wavelet analysis can perform multi-scale analysis of signals and capture features in different frequency ranges, which is very useful for detecting and separating interference signals of different frequencies.

[0047] 2. Advantages of noise suppression,

[0048] That is, wavelet transform can decompose the signal into sub-bands of different frequencies, and each sub-band can be processed independently. By selecting a suitable threshold, high-frequency noise can be effectively removed while retaining useful low-frequency signals; and wavelet analysis can adaptively adjust the filter parameters according to the characteristics of the signal, so as to maintain a good filtering effect in different situations.

[0049] 3. Advantages of efficient processing,

[0050] That is, wavelet transform has a variety of fast algorithms (such as Mallat algorithm), which can complete signal decomposition and reconstruction in a shorter time, and is suitable for real-time processing; and compared with Fourier transform, wavelet transform has lower computational complexity when processing non-stationary signals, and is more suitable for real-time applications.

[0051] 4. Advantages of strong flexibility,

[0052] That is, wavelet analysis provides a variety of basis functions (such as Haar wavelet, Daubechies wavelet, etc.), and the most suitable basis function can be selected according to the specific application scenario to improve the accuracy of the analysis; and wavelet analysis can be easily extended to multidimensional signal processing and is suitable for processing multidimensional data such as images and videos.

[0053] 5. Strong robustness.

[0054] That is, wavelet analysis is highly robust to sudden changes and discontinuities in signals, and can effectively process signals with nonlinear features such as spikes and pulses. Moreover, wavelet transform has a certain redundancy, and even if part of the data is lost or damaged, the signal can still be restored through the remaining data.

[0055] According to needs, the instrument signal analysis module uses a filter to filter the decomposed current signal.

[0056] The data acquisition module is used to analyze the current signal output by the instrument signal analysis module;

[0057] In particular, the data acquisition module uses a frequency domain analysis algorithm to analyze the current signal after filtering.

[0058] The central control module is used to control the instrument signal module to filter the corresponding current signal again when the analysis result is abnormal;

[0059] It should be noted that users can also set the maximum number of filtering times in the central control module. For a certain interference source, if multiple filtering is performed on the interference source, then the subsequent multiple filtering will waste the overall detection time of the system, thereby affecting the detection efficiency of the interference source. Therefore, setting the maximum number of filtering times can improve the overall detection efficiency of the system.

[0060] The signal processing algorithm module is used to receive the current signal filtered by the instrument signal analysis module each time, and judge the situation of the interference source in multiple instrument devices after processing.

[0061] In addition, the data acquisition module is set to be multiple, and each data acquisition module correspondingly collects the current signal of an equipment instrument.

[0062] In addition, the signal processing algorithm module establishes an interference current matrix and an interference signal frequency matrix based on the acquired current signal, thereby determining the location of the interference source in multiple instrument devices and judging whether the interference source is unique.

[0063] Example 2

[0064] The processing method based on the interference signal processing system includes:

[0065] S1. Collect current signals of multiple instruments and equipment in nuclear power plants;

[0066] S2. Perform waveform analysis on the collected current signal to construct an initial current amplitude set I and an initial frequency set F corresponding to each current value;

[0067] That is, F={f1,f2,…,f N}

[0068] I={I1,I2,…,I N}

[0069] S3. Determine the maximum current I in the initial current amplitude set I max1 , and I max1 =Max(I), and for the maximum current I max1 Conduct analysis;

[0070] S4. If the signal analysis result is abnormal;

[0071] S5. Maximum current I for initial frequency concentration max1The central control module sends a filtering instruction to the instrument signal analysis module, and the filtered current amplitude set I c1 Maximum current I max2 Conduct analysis;

[0072] Among them I c1 ={I1,I2,…,I N1}

[0073] I max2 =Max(I c1 )

[0074] The filtered current amplitude set I c1 The frequency corresponding to each current value is F c1 ={f1,f2,…,f N1}.

[0075] And, N1 is the number of frequency components obtained after decomposing the transmitted current signal after the first filtering process;

[0076] S6. If the analysis result is still abnormal, repeat S5 until the signal analysis result is normal;

[0077] S7. If the signal analysis result is normal, the current amplitude set after each filtering and the frequency corresponding to the current amplitude set are output to the signal processing algorithm;

[0078] S8. The signal processing algorithm processes and obtains the situation of the interference source in the instrument equipment.

[0079] In addition, the processing method of the S8 signal processing algorithm is:

[0080] S81. Based on the obtained multiple current amplitude sets, establish an interference current matrix and an interference signal frequency matrix, wherein the columns of the two matrices are represented by the serial numbers of multiple equipment instruments, and the rows of the two matrices are represented by the number of filtering times;

[0081] The interference current matrix I nm for:

[0082]

[0083] I in the matrix cnm is the current value of the nth instrument device after the mth filtering;

[0084] Interference signal frequency matrix F nm for:

[0085]

[0086] f in the matrix cnmis the frequency corresponding to the current value of the nth instrument device after the mth filtering;

[0087] S82. Based on the interference current matrix I nm , by sorting the maximum values ​​of each column vector in the matrix, the interference degree of each interference device is obtained, and the position of each interference device is located;

[0088] S83. Based on the interference signal frequency matrix F nm , determine the frequency difference corresponding to each level of interference equipment, and combine the location of each interference device to finally determine the number of interference sources.

[0089] In the nuclear power plant system, the equipment instrument X is generally the pressure, temperature, flow, voltage and current monitoring equipment of the pressurized water reactor loop, pump and valve, etc. Therefore, by determining the interference equipment at each level and its installation location, the interference area can be delineated, and the equipment instrument that is most seriously interfered is determined to be the interference source, thereby locating the interference source;

[0090] Compare the interference signal frequency matrix F of each level of interference equipment nm If the interference signal frequencies of interference devices at all levels are similar, the interference source is relatively single; if the interference signal frequencies of interference devices at all levels are greatly different, the interference source is not unique.

[0091] Particularly, the frequency difference between the interfering devices is 5-10 Hz.

[0092] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An interference signal processing system for a nuclear power plant, comprising a data acquisition module, an instrument signal analysis module, a central control module and a signal processing algorithm module; The instrument signal analysis module is used to obtain current signals of multiple instrument devices in the nuclear power plant, decompose the multiple current signals, and filter the decomposed current signals; The data acquisition module is used to analyze the current signal output by the instrument signal analysis module; The central control module is used to control the instrument signal module to filter the corresponding current signal again when the analysis result is abnormal; The signal processing algorithm module is used to receive the current signal filtered by the instrument signal analysis module each time, and judge the situation of the interference source in multiple instrument devices after processing.

2. The interference signal processing system for a nuclear power plant according to claim 1, characterized in that: The instrument signal analysis module decomposes multiple current signals through a waveform analysis algorithm to obtain an initial frequency set and an initial current amplitude set corresponding to each frequency.

3. The interference signal processing system for a nuclear power plant according to claim 2, characterized in that: The waveform analysis algorithm adopts the wavelet analysis method.

4. The interference signal processing system for a nuclear power plant according to claim 1, characterized in that: The instrument signal analysis module uses a filter to filter the decomposed current signal.

5. The interference signal processing system for a nuclear power plant according to claim 1, characterized in that: The number of the data acquisition modules is multiple, and each data acquisition module is corresponding to the current signal collected by an instrument of an equipment.

6. The interference signal processing system for a nuclear power plant according to claim 1, characterized in that: The data acquisition module uses a frequency domain analysis algorithm to analyze the current signal after filtering.

7. The interference signal processing system for a nuclear power plant according to claim 1, characterized in that: The signal processing algorithm module establishes an interference current matrix and an interference signal frequency matrix based on the acquired current signal, thereby determining the location of interference sources in multiple instrument devices and judging whether the interference sources are unique.

8. The interference signal processing system for a nuclear power plant according to any one of claims 1 to 7, characterized in that: The processing method based on the interference signal processing system includes: S1. Collect current signals of multiple instruments and equipment in nuclear power plants; S2. Performing waveform analysis on the collected current signal to construct an initial current amplitude set and an initial frequency set corresponding to each current value; S3. Determine the maximum current in the initial current amplitude concentration and analyze the maximum current; S4. If the signal analysis result is abnormal; S5. Filter the maximum current in the initial frequency concentration, the central control module sends a filtering instruction to the instrument signal analysis module, and analyzes the maximum current of the filtered current amplitude set; S6. If the analysis result is still abnormal, repeat S5 until the signal analysis result is normal; S7. If the signal analysis result is normal, the current amplitude set after each filtering and the frequency corresponding to the current amplitude set are output to the signal processing algorithm; S8. The signal processing algorithm processes and obtains the situation of the interference source in the instrument equipment.

9. The interference signal processing system for a nuclear power plant according to claim 8, characterized in that: The processing method of the S8 signal processing algorithm is: S81. Based on the obtained multiple current amplitude sets, establish an interference current matrix and an interference signal frequency matrix, wherein the columns of the two matrices are represented by the serial numbers of multiple equipment instruments, and the rows of the two matrices are represented by the number of filtering times; S82. Based on the interference current matrix, the interference degree of each interference device is obtained by sorting the maximum values ​​of each column vector in the matrix, and the position of each interference device is located; S83. Based on the interference signal frequency matrix, determine the frequency difference corresponding to each level of interference equipment, and finally determine the number of interference sources in combination with the location of each interference device.

10. The interference signal processing system for a nuclear power plant according to claim 9, characterized in that: The frequency difference between the interference devices is 5-10 Hz.

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