An interference signal processing system for a nuclear power plant

Abstract

The utility model relates to a kind of interference signal processing system for nuclear power plant, it is related to data processing technical field, including data acquisition module, instrument signal analysis module, central control module and signal processing algorithm module;The instrument signal analysis module is used to obtain the current signal of multiple instrument devices in nuclear power plant, and multiple current signals are decomposed, and the current signal after decomposition is filtered;The data acquisition module is used to analyze the current signal output by instrument signal analysis module;The central control module is used to control instrument signal module to the corresponding current signal is filtered again when the analysis result is abnormal;The signal processing algorithm module is used to receive the current signal after filtering by instrument signal analysis module each time, and the situation of interference source in multiple instrument devices is judged after processing;The position of interference source can be accurately positioned.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of data processing, in particular to an interference signal processing system for nuclear power device. BACKGROUND

[0002] In the nuclear power device, the dense data collection mode of controller and collection module is often used, which collects the running or starting voltage and current of mechanical equipment such as pump and valve, and the temperature and pressure data of each loop of pressurized water reactor, and the number of data channels of the collection system is numerous. The collection module usually uses analog current collection (Analog Input, AI) module to collect 4-20mA direct current, and then calculates the corresponding actual instrument signal.

[0003] However, in the actual application of the nuclear power device, due to the frequent start-stop or operation of high-power equipment such as various types of pumps and large-diameter valves, electromagnetic interference is generated, which can cause abnormal or false signals of instrument input signals. Therefore, under the influence of electromagnetic interference of surrounding high-power equipment, the collection module will generate coupled interference current in the loop, resulting in large errors in the collected instrument signals, which seriously affects the correct judgment of the actual working condition by the operation personnel, or causes false alarm and misoperation of interlock protection of the instrument control system, affects the normal operation of the nuclear power device, and forms a serious safety hazard.

[0004] Traditionally, the cable of the collection module is replaced with an instrument control cable with metal shielding, which can shield low-frequency current interference. However, the penetration depth of high-frequency interference signals is much greater than the shielding thickness of the instrument control cable, resulting in very limited shielding effect of the instrument control cable. SUMMARY

[0005] The purpose of the present application is to provide an interference signal processing system for nuclear power device, which can accurately locate the position of the interference source.

[0006] The present application is realized by the following technical scheme:

[0007] An interference signal processing system for nuclear power device, comprising a data collection 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 the current signals of a plurality of instrument devices in the nuclear power device, and to decompose a plurality of current signals and filter the decomposed current signals;

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

[0010] The central control module is configured to control the instrument signal module to re-filter the corresponding current signal when the analysis result is abnormal.

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

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

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

[0014] Further, the instrument signal analysis module filters the decomposed current signal by a filter.

[0015] Further, the data acquisition module is provided as multiple, and each data acquisition module acquires the current signal of one device instrument.

[0016] Further, the data acquisition module analyzes the filtered current signal by a frequency domain analysis algorithm.

[0017] Further, the signal processing algorithm module establishes an interference current matrix and an interference signal frequency matrix based on the obtained current signal, further determines the position of the interference source in the multiple instrument devices, and determines whether the interference source is unique.

[0018] Further, the processing method based on the interference signal processing system comprises:

[0019] S1. Acquire the current signal of the multiple instrument devices in the nuclear power device;

[0020] S2. Perform waveform analysis on the acquired current signal, 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 set, and analyze the maximum current;

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

[0023] S5. Filter the maximum current in the initial frequency set, send a filtering instruction to the instrument signal analysis module by the central control module, and analyze 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, output the current amplitude set after each filtering and the frequency corresponding to the current amplitude set to the signal processing algorithm;

[0026] S8. Process and obtain the situation of the interference source in the instrument device by the signal processing algorithm.

[0027] Further, 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 as the numbers of the multiple device instruments, and the rows of the two matrices are represented as the number of filtering;

[0029] S82. Based on the interference current matrix, sort the maximum value of each column vector in the matrix to obtain the interference degree of each interference device and locate the position of each interference device;

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

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

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

[0033] The present application can comprehensively analyze the interference situation of each instrument device by means of multiple filtering, so as to accurately judge the position of the interference source and further accurately eliminate the interference source. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The present application is a structural schematic diagram. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0037] It should be noted that like reference numerals and characters refer to like elements throughout the several views of the drawings, and that, unless otherwise indicated, like reference numerals and characters in different figures represent the same or similar elements.

[0038] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of the application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In the description of the present application, it should also be noted that, unless otherwise specified and limited, the terms "provided", "mounted", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] Embodiment 1

[0041] In combination with the accompanying Figure 1 The interference signal processing system for nuclear power plants 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 acquire current signals of a plurality of instrument devices in the nuclear power plant, and to decompose the plurality of 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 plurality of instrument devices collected, and 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 and send to the data acquisition module again.

[0044] In addition, the instrument signal analysis module decomposes the plurality of current signals by 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 time and frequency domains; traditional Fourier transform can only provide frequency domain information, while wavelet analysis can provide frequency information at different time points of the signal, which is particularly important for analyzing transient signals and non-stationary signals; and wavelet analysis can perform multi-scale analysis on signals to capture features in different frequency ranges, which is very useful for detecting and separating different frequency interference signals.

[0047] 2. The advantages of noise suppression,

[0048] That is, wavelet transform can decompose signals into subbands of different frequencies, and each subband can be processed independently. By selecting appropriate threshold values, high-frequency noise can be effectively removed while preserving useful low-frequency signals; and wavelet analysis can adaptively adjust filter parameters according to the characteristics of the signal, so that good filtering effect can be maintained in different situations.

[0049] 3. The advantages of efficient processing,

[0050] That is, wavelet transform has various fast algorithms (such as Mallat algorithm), which can complete signal decomposition and reconstruction in a short time, 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. The advantages of strong flexibility,

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

[0053] 5. The advantages of strong robustness,

[0054] That is, wavelet analysis has strong robustness to mutations and discontinuities in signals, and can effectively process signals containing nonlinear characteristics such as spikes and pulses. And wavelet transform has a certain redundancy, even if part of the data is lost or damaged, the signal can still be recovered from the remaining data.

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

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

[0057] In particular, the data acquisition module analyzes the filtered current signal using a frequency domain analysis algorithm.

[0058] The central control module is configured to control the meter signal module to perform re-filtering on the corresponding current signal when the analysis result is abnormal.

[0059] It should be noted that the user 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, the subsequent multiple filtering wastes the overall detection time of the system, thereby affecting the detection efficiency of the interference source. Therefore, by setting the maximum number of filtering times, the overall detection efficiency of the system can be improved.

[0060] The signal processing algorithm module is configured to receive the current signal after each filtering of the meter signal analysis module, and determine the situation of the interference source in the multiple meter devices after processing.

[0061] In addition, the data acquisition module is provided in multiple numbers, and each data acquisition module acquires the current signal of one device meter.

[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, and further determines the position of the interference source in the multiple meter devices, and judges whether the interference source is unique.

[0063] Embodiment 2

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

[0065] S1. Acquire the current signal of the multiple meter devices in the nuclear power device;

[0066] S2. Perform waveform analysis on the acquired current signal, 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 max1 in the initial current amplitude set I, and I max1 = Max(I), and analyze the maximum current I max1 .

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

[0071] S5. Filter the maximum current I max1The central control module sends a filtering instruction to the instrument signal analysis module and generates 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, where the columns of the two matrices represent the numbers of multiple equipment instruments, and the rows of the two matrices represent 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 after the mth filtering;

[0084] Interference signal frequency matrix F nm for:

[0085]

[0086] f in the matrix cnmThe 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 value 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 , the frequency difference corresponding to each level of interference device is judged, combined with the position of each interference device, and finally the number of interference sources is determined.

[0089] In the nuclear power plant system, the instrument X is generally a pressurized water reactor loop pressure, temperature, flow, pump and valve voltage, current monitoring device, etc., so by determining the interference equipment at each level and its installation position, the interference area can be determined, and the most seriously interfered device instrument is determined as the interference source, thereby realizing the positioning of the interference source;

[0090] By comparing the element values in the interference signal frequency matrix F nm of each level of interference device, if the interference signal frequencies of each level of interference device are similar, the interference source is relatively single; if the interference signal frequencies of each level of interference device have large differences, the interference source is not unique.

[0091] In particular, the frequency difference between the interference devices is 5-10 hz.

[0092] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An interference signal processing system for nuclear power plants, 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 configured to acquire current signals of a plurality of instrument devices in the nuclear power plant, decompose the current signals, and filter the decomposed current signals; the data acquisition module is configured to analyze the current signals output by the instrument signal analysis module; the central control module is configured to control the instrument signal analysis module to perform filtering again on the corresponding current signal when the analysis result is abnormal; the signal processing algorithm module is configured to receive the current signals filtered each time by the instrument signal analysis module, and determine the situation of the interference source in the plurality of instrument devices after processing; a processing method based on the interference signal processing system, comprising: S1. acquiring current signals of a plurality of instrument devices in the nuclear power plant; S2. performing waveform analysis on the acquired current signals, constructing an initial current amplitude set, and an initial frequency set corresponding to each current value; S3. determining the maximum current in the initial current amplitude set, and analyzing the maximum current; S4. if the signal analysis result is abnormal; S5. filtering the maximum current in the initial frequency set, sending a filtering instruction to the instrument signal analysis module by the central control module, and analyzing the maximum current in the current amplitude set after filtering; S6. if the analysis result is still abnormal, repeating S5 until the signal analysis result is normal; S7. if the signal analysis result is normal, outputting the current amplitude set after each filtering and the frequency corresponding to the current amplitude set to the signal processing algorithm; S8. processing by the signal processing algorithm and obtaining the situation of the interference source in the instrument device; the processing method of the S8 signal processing algorithm is: S81. based on the acquired plurality of current amplitude sets, establishing an interference current matrix and an interference signal frequency matrix, wherein the columns of the two matrices are represented as the numbers of the plurality of instrument devices, and the rows of the two matrices are represented as the number of filtering; S82. based on the interference current matrix, sorting the maximum values of each column vector in the matrix to obtain the interference degree of each interference device, and positioning the position of each interference device; S83. based on the interference signal frequency matrix, judging the frequency difference corresponding to each level of interference device, and finally determining the number of interference sources in combination with the positions of the interference devices; and when comparing the element values in the interference signal frequency matrices of each level of interference device, if the interference signal frequencies of each level of interference device are similar, the interference source is relatively single; if the interference signal frequencies of each level of interference device have large differences, the interference source is not unique.

2. The interference signal processing system for a nuclear power plant according to claim 1, characterized by: The instrument signal analysis module decomposes the plurality of current signals by 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 by: The waveform analysis algorithm adopts a wavelet analysis method.

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

5. The interference signal processing system for a nuclear power plant as claimed in claim 1, characterized by: The data acquisition module is provided as a plurality, and each data acquisition module acquires the current signal of one instrument device.

6. The interference signal processing system for a nuclear power plant as claimed in claim 1, characterized by: The data acquisition module adopts a frequency domain analysis algorithm to analyze the filtered current signal.

7. The interference signal processing system for a nuclear power plant as claimed in claim 1, characterized by: The frequency difference between the interference devices is 5-10 Hz.

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