CN112684495A - Nuclear power plant alarm device and method - Google Patents
Nuclear power plant alarm device and method Download PDFInfo
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Abstract
The invention provides a nuclear power plant alarm device and a method, wherein the nuclear power plant alarm device comprises a controller, a three-way acceleration collector and an operation filtering component, wherein the three-way acceleration collector is connected with the controller and used for collecting three-way acceleration, and the operation filtering component is connected with the controller and used for sequentially carrying out Fourier transform, filtering and inverse Fourier transform on the three-way acceleration to obtain three-way target acceleration so as to synthesize vector acceleration according to the three-way target acceleration. In the embodiment provided by the invention, the operation filtering component is arranged to sequentially carry out Fourier transform, filtering and inverse Fourier transform on the collected acceleration in three directions, so that the target acceleration in three directions is obtained, the synthesized vector acceleration is more accurate, and the phenomena of false alarm, false alarm and the like of the earthquake acceleration are prevented, so that the normal operation of the nuclear power plant is influenced.
Description
Technical Field
The invention relates to the field of monitoring and alarming, in particular to an alarming device and method for a nuclear power plant.
Background
The strong earthquake observation has irreplaceable effect in seismic fortification of heavy projects such as nuclear power plants, high-speed rails and the like. According to the requirements of nuclear power plant earthquake-resistant design code (GB 50267): the nuclear power plant must be provided with an earthquake monitoring and warning system.
At present, all nuclear power plants are provided with seismic instrument systems, and the automatic shutdown triggering signal method of a general seismic instrument system is as follows: when the acceleration measured by four time-range accelerometers on the containment foundation exceeds a preset threshold value, an earthquake automatic shutdown trigger signal is generated. However, the acceleration measured by the existing accelerometer needs to take the maximum peak value in three directions, and the peak value in a certain upward direction is larger, so that the phenomena of false alarm, false report and the like of the earthquake acceleration are easily caused, and a reactor shutdown signal is easily triggered, thereby affecting the normal operation of the nuclear power plant.
Disclosure of Invention
The invention mainly aims to provide a nuclear power plant alarm device and a nuclear power plant alarm method, and aims to improve the accuracy of measured acceleration.
In order to achieve the above object, the present invention provides a nuclear power plant alarm device, including:
a controller;
the three-direction acceleration collector is connected with the controller and used for collecting three-direction acceleration and transmitting the three-direction acceleration to the controller;
and the operation filtering component is connected with the controller and is used for sequentially carrying out Fourier transform, filtering and inverse Fourier transform on the three-direction acceleration to obtain three-direction target acceleration and transmitting the three-direction target acceleration to the controller so that the controller synthesizes vector acceleration according to the three-direction target acceleration.
In an alternative embodiment, the operational filtering component comprises:
the first arithmetic unit is used for carrying out Fourier transform operation on the acceleration in the three directions to obtain an operation value in the three directions;
the filter bank is used for filtering the operation values of the three directions to obtain filtered operation values of the three directions;
and the second arithmetic unit is used for carrying out inverse Fourier transform operation on the filtered three-direction operation value to obtain target acceleration of the three directions and transmitting the target acceleration to the controller.
In an alternative embodiment, the filter bank comprises:
the filter device comprises a first filter, a second filter and a third filter, wherein the first filter, the second filter and the third filter are respectively connected with the controller, and the first filter, the second filter and the third filter are not connected with each other.
In an alternative embodiment, the first filter is a frequency modulation filter, and the frequency modulation filter is:
F1(ω)＝(1/ω)1/2where ω is the frequency of the seismic waves.
In an alternative embodiment, the second filter is a low-pass filter, and the low-pass filter is:
F2(ω)＝(1+0.694X2+0.24X4+0.0557X6+0.009664X8+0.00134X10+0.000155X12)-1/2wherein X is ω/ωcOmega is the frequency of the seismic wave, omegac＝10Hz。
In an alternative embodiment, the third filter is a high-pass filter, and the high-pass filter is:
F3(ω)＝(1-exp(-ω/ω0)3)1/2where ω is the frequency of the seismic wave, ω0＝2Hz。
In an optional embodiment, the nuclear power plant warning device further includes:
a memory connected with the controller.
In an optional embodiment, the nuclear power plant warning device further includes:
the comparator is connected with the controller and used for comparing the magnitude between the vector acceleration and a preset threshold value and sending a comparison result to the controller;
and the alarm is connected with the controller, and the controller controls the alarm to execute corresponding operation according to the comparison result.
In order to achieve the above object, the present invention provides a nuclear power plant alarm method, which is applied to the above nuclear power plant alarm device, and the nuclear power plant alarm method includes:
acquiring the acceleration of the three directions acquired by the three-direction acceleration acquisition device;
carrying out Fourier transform, filtering and Fourier inverse transform on the three-direction acceleration in sequence to obtain three-direction target acceleration;
and synthesizing vector acceleration according to the target acceleration of the three directions.
In an optional embodiment, after the step of synthesizing a vector acceleration according to the target accelerations of the three directions, the method further includes:
comparing the vector acceleration with a preset threshold value to obtain a comparison result;
and controlling an alarm to execute corresponding operation according to the comparison result.
The invention provides a nuclear power plant alarm device and a method, wherein the nuclear power plant alarm device comprises a controller, a three-way acceleration collector and an operation filtering component, the three-way acceleration collector is connected with the controller and used for collecting three-way acceleration and transmitting the three-way acceleration to the controller, and the operation filtering component is connected with the controller and used for sequentially carrying out Fourier transform, filtering and inverse Fourier transform on the three-way acceleration to obtain three-way target acceleration and transmitting the three-way target acceleration to the controller so that the controller synthesizes vector acceleration according to the three-way target acceleration. In other words, in the embodiment provided by the invention, the operation filtering component is arranged to perform Fourier transform, filtering and inverse Fourier transform on the collected three-way acceleration in sequence, so that the three-way target acceleration is obtained, the vector acceleration is synthesized according to the three-way target acceleration, namely the synthesized vector acceleration is more accurate through the Fourier transform, the filtering and the inverse Fourier transform, and the phenomena of false alarm, false alarm and the like of the earthquake acceleration are prevented, so that the normal operation of the nuclear power plant is influenced.
Drawings
In order to more clearly illustrate the embodiments or exemplary technical solutions of the present invention, the drawings used in the embodiments or exemplary descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a nuclear power plant alarm device according to an embodiment of the present invention;
FIG. 2 is a block diagram of an operational filter assembly according to an embodiment of the present invention;
FIG. 3 is a time chart before and after acceleration filtering in three directions according to the embodiment of the present invention;
FIG. 4 is a time-course graph of vector acceleration according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating steps of a nuclear power plant alarm method according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a nuclear power plant alarm device.
In an embodiment, as shown in fig. 1 and 2, the nuclear power plant alarm device includes a controller 10, a three-directional acceleration collector 20 and an operation filtering component 30, wherein the three-directional acceleration collector 20 is connected to the controller 10 and is configured to collect three-directional accelerations and transmit the three-directional accelerations to the controller 10, and the operation filtering component 30 is connected to the controller 10 and is configured to sequentially perform fourier transform, filtering and inverse fourier transform on the three-directional accelerations to obtain three-directional target accelerations and transmit the three-directional target accelerations to the controller 10, so that the controller 10 synthesizes vector accelerations according to the three-directional target accelerations. In other words, in the embodiment provided by the present invention, the operation filtering component 30 is arranged to perform fourier transform, filtering, and inverse fourier transform on the collected three-directional acceleration in sequence, so as to obtain the three-directional target acceleration, and synthesize the vector acceleration according to the three-directional target acceleration, that is, synthesize the vector acceleration more accurately by means of fourier transform, filtering, and inverse fourier transform, so as to prevent the occurrence of phenomena such as false alarm and false alarm of the seismic acceleration, thereby affecting the normal operation of the nuclear power plant.
In this embodiment, the three-direction acceleration collector 20 includes acceleration sensors a 1-An installed in each region of the nuclear power, and the acceleration sensors a 1-An are all electrically connected to the controller 10. Wherein n is a natural number greater than 1, and further n is 6 in practical application, that is, 6 acceleration sensors are included. In An embodiment of the present invention, the acceleration sensors a 1-An are configured to continuously monitor the seismic acceleration values of each area in the nuclear power, measure a plurality of obtained seismic acceleration values, and transmit the seismic acceleration values to the operation filtering component 30, so as to sequentially perform fourier transform, filtering, and inverse fourier transform on the seismic acceleration values to obtain the target acceleration. At this time, the target acceleration is transmitted to the controller 10, the controller 10 synthesizes the vector acceleration, and the controller 10 sends alarm signals of different levels to the alarm when the vector acceleration reaches different threshold values, so as to remind an operator to take corresponding measures. The three-directional acceleration is the acceleration in the directions of the X axis, the Y axis and the Z axis.
That is, in this embodiment, the nuclear power plant alarm device still includes comparator 40 and alarm 50, comparator 40 with controller 10 is connected for the comparison the magnitude between vector acceleration and the preset threshold value to with comparison result send to controller 10, alarm 50 with controller 10 connects, controller 10 basis comparison result control alarm 50 carries out corresponding operation.
Specifically, the controller 10 determines whether the received seismic acceleration value is greater than 0.15g (adjustable, the specific size is based on the actual condition of the nuclear power plant, that is, the seismic acceleration threshold value for safe shutdown needs to be performed), and if the seismic acceleration value is greater than 0.15g (adjustable, the specific size is based on the actual condition of the nuclear power plant), sends a safe shutdown seismic signal to the alarm. The alarm system that this embodiment provided can be with the three branch acceleration of gathering after through Fourier transform, filtering and Fourier inverse transform processing, the three branch target acceleration that obtains to synthesize the vector acceleration for the vector acceleration is more accurate, thereby improves the accuracy and the promptness of reporting to the police, and then avoids causing nuclear incident because of the response is not in time.
Of course, in this embodiment, the controller 10 may also send a seismic event alarm signal to the alarm according to whether the synthesized vector acceleration is greater than 0.01g (i.e. the nuclear power plant seismic event alarm threshold, the seismic acceleration threshold of the occurrence of the seismic event), for example, the seismic acceleration value is greater than 0.01 g. Alternatively, the controller 10 may also send an operation reference seismic signal to an alarm according to whether the synthesized vector acceleration is greater than 0.1g (i.e., an operation reference seismic threshold of the nuclear power plant, i.e., a seismic acceleration threshold that has affected normal operation of the nuclear power plant), for example, if the seismic acceleration value is greater than 0.1 g; the technical scheme provided by the invention can send alarm signals of different levels to the alarm under different earthquake working conditions so as to realize alarm under different working conditions.
Further, the operation filtering component 30 includes a first operator 31, a filter bank 32 and a second operator 33, where the first operator 31 is configured to perform fourier transform operation on the three-directional acceleration to obtain a three-directional operation value, the filter bank 32 is configured to filter the three-directional operation value to obtain a filtered three-directional operation value, and the second operator 33 is configured to perform inverse fourier transform operation on the filtered three-directional operation value to obtain a three-directional target acceleration and transmit the three-directional target acceleration to the controller 10.
Of course, in this embodiment, the nuclear power plant alarm device further includes a memory 60, and the memory 60 is connected to the controller 10. The memory 60 is used for storing the three-directional acceleration collected by the three-directional acceleration collector 20; or, the memory 60 is further configured to store the operation values of the three divisions obtained after the operation of the first arithmetic unit 31; alternatively, the memory 60 is further configured to store the filtered three-way operation values obtained after filtering by the filter bank 32; alternatively, the memory 60 is further configured to store the three-component target acceleration obtained by the operation of the second arithmetic unit 32. That is, the data processed by the three-way acceleration collector 20, the first arithmetic unit 31, the filter bank 32, and the second arithmetic unit 33 are stored in the memory 60, and the data can be fetched from the memory 60 and calculated for each processing.
Further, the controller 10, the operation filtering component 30, the comparator 40, the alarm 50 and the memory 60 are all integrated on a central processing unit or a control circuit board.
Specifically, after the three-directional acceleration collected by the three-directional acceleration collector 20 is calculated by the first arithmetic unit 31, that is, the three-directional acceleration is fourier transformed to obtain three-directional calculation values Gi (ω), where i is the X-axis, Y-axis, and Z-axis directions, that is, the three-directional calculation values Gi (ω) include three, that is, Gx (ω), Gy (ω), and Gz (ω). Where ω is the frequency of the seismic waves.
Further, in order to obtain the acceleration value influenced by the natural frequency sensitive to the nuclear power plant equipment and the structure, in this embodiment, the filter bank 32 is configured to filter the operation value Gi (ω) of the three components to obtain a filtered three-component operation value, so that some interference frequency bands can be filtered.
In order to improve the filtering performance, the filter bank 32 includes a first filter 321, a second filter 322, and a third filter 323, the first filter 321, the second filter 322, and the third filter 323 are respectively connected to the controller 10, and the first filter 321, the second filter 322, and the third filter 323 are not connected to each other, that is, the filtering operations of the first filter 321, the second filter 322, and the third filter 323 are independent from each other, so as to avoid the mutual influence among the first filter 321, the second filter 322, and the third filter 323.
In this embodiment, it is assumed that the first filter 321, the second filter 322, and the third filter 323 are respectively F1(ω)、F2(ω) and F3(ω). Namely filtering the operation value Gi (omega) of the three divisions to obtain Gi0(ω), i.e.:
Gi0(ω)＝Gi(ω)*F1(ω)*F2(ω)*F3(ω)。
wherein i includes x, y, z, in which case Gx0(ω)＝Gx(ω)*F1(ω)*F2(ω)*F3(ω)，Gy0(ω)＝Gy(ω)*F1(ω)*F2(ω)*F3(ω)，Gz0(ω)＝Gz(ω)*F1(ω)*F2(ω)*F3(ω)。
Specifically, the first filter 321 is a frequency modulation filter, and the frequency modulation filter is:
F1(ω)＝(1/ω)1/2；
and omega is the frequency of the seismic waves, and the frequency modulation filter is used for modulating the frequency of the seismic waves so as to filter the frequency band of the interference.
The second filter 322 is a low-pass filter, and the low-pass filter is:
F2(ω)＝(1+0.694X2+0.24X4+0.0557X6+0.009664X8+0.00134X10+0.000155X12)-1/2；
wherein X is ω/ωcOmega is the frequency of the seismic wave, omegacThe low-pass filter is used for suppressing high-frequency components in seismic wave frequency, and is also used for further filtering interference and noise.
The third filter 323 is a high-pass filter, and the high-pass filter is:
F3(ω)＝(1-exp(-ω/ω0)3)1/2；
where ω is the frequency of the seismic waves and ω is the frequency of the seismic waves02Hz, that is, in this embodiment, the high frequency component in the seismic wave frequency is filtered out after the seismic wave frequency is filtered by the low pass filter, that is, the high pass filter is used to remove the unnecessary low frequency component in the seismic wave frequency, so as to remove the low frequency interference.
When Gx is acquired0(ω)、Gy0(ω) and Gz0(ω) thereafter, Gx is processed by the second arithmetic unit 330(ω)、Gy0(ω) and Gz0(omega) Fourier transformInverse transformation to obtain gx(t)、gy(t) and gz(t) so that g is transmitted by the controller 10x(t)、gy(t) and gz(t) synthesizing to obtain a vector acceleration A:
referring to fig. 3(a) and (b), fig. 3(a) is a time-course diagram of the acceleration of the three collected directions before filtering, fig. 3(b) is a time-course diagram of the acceleration of the three collected directions after filtering, and fig. 4 is a time-course diagram of the synthesized vector acceleration.
In this embodiment, the operation filtering component 30 is arranged to prevent the collected three-component acceleration from being subjected to the natural vibration frequency sensitive to the nuclear power plant equipment and structures, so that the data is inaccurate, that is, the collected seismic waves are filtered by the operation filtering component 30, so as to filter out the interference frequency band, and then the acceleration is directly utilized to perform accurate and stable seismic shutdown after a major earthquake occurs.
In addition, in the embodiment, the target acceleration is obtained after the acceleration in three directions is processed to synthesize the full vibration (vector acceleration), so that the accuracy of the acceleration is ensured, the interference of seismic wave three-direction random peak factors is prevented, and the problem that the seismic wave random peak value is large in the past is solved, so that the seismic instrument system does not generate or rarely generates false alarm or false alarm when participating in the automatic shutdown signal.
That is, in the embodiment provided by the present invention, the nuclear power plant alarm device includes a controller 10, a three-directional acceleration collector 20 and an operation filtering component 30, the three-directional acceleration collector 20 is connected to the controller 10, and is configured to collect three-directional accelerations and transmit the three-directional accelerations to the controller 10, the operation filtering component 30 is connected to the controller 10, and is configured to perform fourier transform, filtering and inverse fourier transform on the three-directional accelerations in sequence to obtain three-directional target accelerations and transmit the three-directional target accelerations to the controller 10, so that the controller 10 synthesizes a vector acceleration according to the three-directional target accelerations, and by setting the operation filtering component 30, performs fourier transform, filtering and inverse fourier transform on the collected three-directional accelerations in sequence to obtain three-directional target accelerations, and synthesizing vector acceleration according to the target acceleration of the three directions, namely enabling the synthesized vector acceleration to be more accurate through Fourier transform, filtering and Fourier inverse transform, and preventing the phenomena of false alarm, false report and the like of the earthquake acceleration, thereby influencing the normal operation of the nuclear power plant.
Based on the embodiment, the invention also provides a nuclear power plant alarm method.
As shown in fig. 5, a flowchart of steps of a nuclear power plant alarm method according to an embodiment of the present invention is shown, and specifically, the nuclear power plant alarm method includes:
s100, acquiring the acceleration of the three directions acquired by the three-direction acceleration acquisition device;
s200, carrying out Fourier transform, filtering and Fourier inverse transform on the three-direction acceleration in sequence to obtain three-direction target acceleration;
and S300, synthesizing vector acceleration according to the target acceleration of the three directions.
As shown in fig. 1 and 2, the nuclear power plant alarm device includes a controller 10, a three-way acceleration collector 20 and an operation filter assembly 30, the three-way acceleration collector 20 is connected with the controller 10, the operation filter assembly 30 is connected with the controller 10, that is, the three-way acceleration collector 20 is used for collecting three-way acceleration and transmitting the three-way acceleration to the controller 10, the operation filter assembly 30 is used for sequentially carrying out fourier transform, filtering and inverse fourier transform on the three-way acceleration to obtain three-way target acceleration and transmitting the three-way target acceleration to the controller 10, and the controller 10 is used for synthesizing vector acceleration according to the three-way target acceleration. In other words, in the embodiment provided by the invention, the three-directional target acceleration is obtained by sequentially carrying out Fourier transform, filtering and inverse Fourier transform on the collected three-directional acceleration, and the vector acceleration is synthesized according to the three-directional target acceleration, namely, the synthesized vector acceleration is more accurate by means of Fourier transform, filtering and inverse Fourier transform, so that the phenomena of false alarm, false alarm and the like of the earthquake acceleration are prevented, and the normal operation of the nuclear power plant is influenced. The three-directional acceleration is the acceleration in the directions of the X axis, the Y axis and the Z axis.
In this embodiment, the nuclear power plant alarm device still includes comparison ware 40 and alarm 50, compare ware 40 with controller 10 connects, alarm 50 with controller 10 connects, comparison ware 40 is used for comparing the size between vector acceleration and the predetermined threshold value to with the comparison result send to controller 10, controller 10 basis the comparison result control alarm 50 carries out corresponding operation.
Specifically, the controller 10 determines whether the received seismic acceleration value is greater than 0.15g (i.e., a nuclear power plant safe shutdown seismic threshold, i.e., a seismic acceleration threshold that needs to be safely shutdown), and if the seismic acceleration value is greater than 0.15g, sends a safe shutdown seismic signal to the alarm. The alarm system that this embodiment provided can be with the three branch acceleration of gathering after through Fourier transform, filtering and Fourier inverse transform processing, the three branch target acceleration that obtains to synthesize the vector acceleration for the vector acceleration is more accurate, thereby improves the accuracy and the promptness of reporting to the police, and then avoids causing nuclear incident because of the response is not in time.
Further, the operation filtering component 30 includes a first operator 31, a filter bank 32 and a second operator 33, where the first operator 31 is configured to perform fourier transform operation on the three-directional acceleration to obtain a three-directional operation value, the filter bank 32 is configured to filter the three-directional operation value to obtain a filtered three-directional operation value, and the second operator 33 is configured to perform inverse fourier transform operation on the filtered three-directional operation value to obtain a three-directional target acceleration and transmit the three-directional target acceleration to the controller 10.
Of course, in this embodiment, the nuclear power plant alarm device further includes a memory 60, and the memory 60 is connected to the controller 10. The memory 60 is used for storing the three-directional acceleration collected by the three-directional acceleration collector 20; or, the memory 60 is further configured to store the operation values of the three divisions obtained after the operation of the first arithmetic unit 31; alternatively, the memory 60 is further configured to store the filtered three-way operation values obtained after filtering by the filter bank 32; alternatively, the memory 60 is further configured to store the three-component target acceleration obtained by the operation of the second arithmetic unit 32. That is, the data processed by the three-way acceleration collector 20, the first arithmetic unit 31, the filter bank 32, and the second arithmetic unit 33 are stored in the memory 60, and the data can be fetched from the memory 60 and calculated for each processing.
Specifically, after the three-directional acceleration collected by the three-directional acceleration collector 20 is calculated by the first arithmetic unit 31, that is, the three-directional acceleration is fourier transformed to obtain three-directional calculation values Gi (ω), where i is the X-axis, Y-axis, and Z-axis directions, that is, the three-directional calculation values Gi (ω) include three, that is, Gx (ω), Gy (ω), and Gz (ω). Where ω is the frequency of the seismic waves.
Further, in order to obtain the acceleration value influenced by the natural frequency sensitive to the nuclear power plant equipment and the structure, in this embodiment, the filter bank 32 is configured to filter the operation value Gi (ω) of the three components to obtain a filtered three-component operation value, so that some interference frequency bands can be filtered.
In order to improve the filtering performance, the filter bank 32 includes a first filter 321, a second filter 322, and a third filter 323, the first filter 321, the second filter 322, and the third filter 323 are respectively connected to the controller 10, and the first filter 321, the second filter 322, and the third filter 323 are not connected to each other, that is, the filtering operations of the first filter 321, the second filter 322, and the third filter 323 are independent from each other, so as to avoid the mutual influence among the first filter 321, the second filter 322, and the third filter 323.
In this embodiment, it is assumed that the first filter 321, the second filter 322, and the third filter 323 are respectively F1(ω)、F2(ω) and F3(ω). Namely filtering the operation value Gi (omega) of the three divisions to obtain Gi0(ω), i.e.:
Gi0(ω)＝Gi(ω)*F1(ω)*F2(ω)*F3(ω)。
wherein i includes x, y, z, in which case Gx0(ω)＝Gx(ω)*F1(ω)*F2(ω)*F3(ω)，Gy0(ω)＝Gy(ω)*F1(ω)*F2(ω)*F3(ω)，Gz0(ω)＝Gz(ω)*F1(ω)*F2(ω)*F3(ω)。
Specifically, the first filter 321 is a frequency modulation filter, and the frequency modulation filter is:
F1(ω)＝(1/ω)1/2；
and omega is the frequency of the seismic waves, and the frequency modulation filter is used for modulating the frequency of the seismic waves so as to filter the frequency band of the interference.
The second filter 322 is a low-pass filter, and the low-pass filter is:
F2(ω)＝(1+0.694X2+0.24X4+0.0557X6+0.009664X8+0.00134X10+0.000155X12)-1/2；
wherein X is ω/ωcOmega is the frequency of the seismic wave, omegacThe low-pass filter is used for suppressing high-frequency components in seismic wave frequency, and is also used for further filtering interference and noise.
The third filter 323 is a high-pass filter, and the high-pass filter is:
F3(ω)＝(1-exp(-ω/ω0)3)1/2；
where ω is the frequency of the seismic waves and ω is the frequency of the seismic waves02Hz, i.e. in this embodiment due to the passing of seismic frequenciesAfter filtering, the low-pass filter removes high-frequency components in the seismic wave frequency, namely, the high-pass filter is used for removing unnecessary low-frequency components in the seismic wave frequency, so that low-frequency interference is removed.
When Gx is acquired0(ω)、Gy0(ω) and Gz0(ω) thereafter, Gx is processed by the second arithmetic unit 330(ω)、Gy0(ω) and Gz0(ω) inverse Fourier transform to get gx(t)、gy(t) and gz(t) so that g is transmitted by the controller 10x(t)、gy(t) and gz(t) synthesizing to obtain a vector acceleration A:
referring to fig. 3(a) and (b), fig. 3(a) is a time-course diagram of the acceleration of the three collected directions before filtering, fig. 3(b) is a time-course diagram of the acceleration of the three collected directions after filtering, and fig. 4 is a time-course diagram of the synthesized vector acceleration.
In this embodiment, the operation filtering component 30 is arranged to prevent the collected three-component acceleration from being subjected to the natural vibration frequency sensitive to the nuclear power plant equipment and structures, so that the data is inaccurate, that is, the collected seismic waves are filtered by the operation filtering component 30, so as to filter out the interference frequency band, and then the acceleration is directly utilized to perform accurate and stable seismic shutdown after a major earthquake occurs.
In addition, in the embodiment, the target acceleration is obtained after the acceleration in three directions is processed to synthesize the full vibration (vector acceleration), so that the accuracy of the acceleration is ensured, the interference of seismic wave three-direction random peak factors is prevented, and the problem that the seismic wave random peak value is large in the past is solved, so that the seismic instrument system does not generate or rarely generates false alarm or false alarm when participating in the automatic shutdown signal.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the specification and the drawings, or any other related technical fields directly or indirectly applied thereto under the conception of the present invention are included in the scope of the present invention.
Claims (10)
1. A nuclear power plant warning device, characterized in that the nuclear power plant warning device includes:
a controller;
the three-direction acceleration collector is connected with the controller and used for collecting three-direction acceleration and transmitting the three-direction acceleration to the controller;
and the operation filtering component is connected with the controller and is used for sequentially carrying out Fourier transform, filtering and inverse Fourier transform on the three-direction acceleration to obtain three-direction target acceleration and transmitting the three-direction target acceleration to the controller so that the controller synthesizes vector acceleration according to the three-direction target acceleration.
2. The nuclear power plant warning device of claim 1, wherein the operational filtering component comprises:
the first arithmetic unit is used for carrying out Fourier transform operation on the acceleration in the three directions to obtain an operation value in the three directions;
the filter bank is used for filtering the operation values of the three directions to obtain filtered operation values of the three directions;
and the second arithmetic unit is used for carrying out inverse Fourier transform operation on the filtered three-direction operation value to obtain target acceleration of the three directions and transmitting the target acceleration to the controller.
3. The nuclear power plant warning device of claim 2, wherein the filter bank comprises:
the filter device comprises a first filter, a second filter and a third filter, wherein the first filter, the second filter and the third filter are respectively connected with the controller, and the first filter, the second filter and the third filter are not connected with each other.
4. A nuclear power plant alarm device according to claim 3, characterised in that the first filter is a frequency-modulated filter, the frequency-modulated filter being:
F1(ω)＝(1/ω)1/2where ω is the frequency of the seismic waves.
5. The nuclear power plant warning device of claim 4, wherein the second filter is a low pass filter, the low pass filter being:
F2(ω)＝(1+0.694X2+0.24X4+0.0557X6+0.009664X8+0.00134X10+0.000155X12)-1/2,
wherein X is ω/ωcOmega is the frequency of the seismic wave, omegac＝10Hz。
6. The nuclear power plant warning device of claim 5, wherein the third filter is a high pass filter, the high pass filter being:
F3(ω)＝(1-exp(-ω/ω0)3)1/2where ω is the frequency of the seismic wave, ω0＝2Hz。
7. The nuclear power plant warning device of claim 1, further comprising:
a memory connected with the controller.
8. A nuclear power plant alarm device according to any of claims 1 to 7, further comprising:
the comparator is connected with the controller and used for comparing the magnitude between the vector acceleration and a preset threshold value and sending a comparison result to the controller;
and the alarm is connected with the controller, and the controller controls the alarm to execute corresponding operation according to the comparison result.
9. A nuclear power plant alarm method is applied to the nuclear power plant alarm device of any one of claims 1 to 8, and is characterized by comprising the following steps:
acquiring the acceleration of the three directions acquired by the three-direction acceleration acquisition device;
carrying out Fourier transform, filtering and Fourier inverse transform on the three-direction acceleration in sequence to obtain three-direction target acceleration;
and synthesizing vector acceleration according to the target acceleration of the three directions.
10. The nuclear power plant alarm method of claim 9, wherein the step of synthesizing a vector acceleration from the target accelerations in the three directions is followed by further comprising:
comparing the vector acceleration with a preset threshold value to obtain a comparison result;
and controlling an alarm to execute corresponding operation according to the comparison result.
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