CN114093541A - Automatic processing method and system for rod drop performance parameters of control rod drive wire for nuclear power station - Google Patents
Automatic processing method and system for rod drop performance parameters of control rod drive wire for nuclear power station Download PDFInfo
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- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
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Abstract
The invention discloses a method and a system for automatically processing rod drop performance parameters of a control rod drive wire for a nuclear power station, which relate to the technical field of nuclear power measurement, and have the technical scheme key points that: determining the control rod drive wire power-off signal cutting moment t according to the power-off signal curve and the pull-in current curve1Determining the time t when the control rod drive wire begins to fall according to the vibration curve2Determining the time t when the control rod drive wire enters the buffer section according to the displacement curve3According to the vibration curve and the displacement curve, the time t from the rod to the bottom displacement of 04(ii) a According to the time t1、t2、t3、t4Performing difference calculation to obtain electromechanical delay time T of rod drop performance parameters1Fast insertion time T2Bar to buffer time T3And total rod drop time T4. When only 1 primary coil voltage signal is given and the induced electromotive force is not stable, the method for determining the rod falling performance parameter by introducing multiple signals to judge jointly realizes the rod falling performanceThe parameters can be accurately and automatically acquired.
Description
Technical Field
The invention relates to the technical field of nuclear power measurement, in particular to a method and a system for automatically processing rod drop performance parameters of a control rod drive wire for a nuclear power station.
Background
In a control rod drive wire thermal state examination test of a drive wire commonly used in a nuclear power station, on the basis of an existing position indicator, a mode of combining a primary coil and a secondary coil is adopted, and the falling speed of a control rod is in direct proportion to induced electromotive force in the primary coil, so that the falling speed is indirectly measured by measuring the induced electromotive force in the primary coil, the falling speed is integrated with time, a falling rod displacement-time curve can be obtained, and finally falling rod performance parameters of various working conditions are obtained on the falling rod displacement-time curve.
At present, the existing method for obtaining the thermal state examination test of the control rod drive wire of the drive wire commonly used in the nuclear power station is suitable for the condition that the induced electromotive force of a primary coil and a secondary coil can be led out on the drive wire, and can better obtain the rod drop performance parameters meeting the test requirements. However, the conventional measurement method has the following disadvantages: (1) for some special driving wires, only a primary coil can be led out of the driving wire to provide 1 voltage induced potential, and the method is not applicable under the condition that the induced potential is not stable; (2) after the displacement time curve is obtained, manual reading is basically carried out, so that the accuracy is low, the data volatility is high, and the repeatability is poor; (3) the rod falling performance parameter reading is greatly influenced if the displacement curve has defects through single judgment by the rod falling displacement time curve; (4) with the more times of rod falling, the labor workload is huge, and the time and the labor are consumed.
Therefore, how to research and design a method and a system for automatically processing the rod drop performance parameters of the control rod drive wire for the nuclear power station, which can overcome the defects, is a problem which is urgently needed to be solved at present.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method and a system for automatically processing the rod drop performance parameters of a control rod drive line for a nuclear power station.
The technical purpose of the invention is realized by the following technical scheme:
in a first aspect, a method for automatically processing rod drop performance parameters of a control rod drive line for a nuclear power station is provided, which comprises the following steps:
acquiring a power-off signal, an attraction current signal, a primary coil voltage signal and a vibration signal of a set position in a rod falling process of a control rod drive wire, and establishing a corresponding power-off signal curve, an attraction current curve, a displacement curve and a vibration curve;
determining the control rod drive wire power-off signal cutting moment t according to the power-off signal curve and the pull-in current curve1Determining the time t when the control rod drive wire begins to fall according to the vibration curve2Determining the time t when the control rod drive wire enters the buffer section according to the displacement curve3According to the vibration curve and the displacement curve, the time t from the rod to the bottom displacement of 04；
According to the time t1、t2、t3、t4Performing difference calculation to obtain electromechanical delay time T of rod drop performance parameters1Fast insertion time T2Bar to buffer time T3And total rod drop time T4。
Further, the cutting time t of the control rod drive wire power-off signal1The determination process specifically comprises the following steps:
selecting the time t corresponding to the time when the power-off signal curve interrupts the electrical signal from the maximum value to 0i；
Selecting a time period delta t corresponding to the time period for reducing the maximum displacement value to a preset displacement value in the pull-in current curve;
if at time tiWithin the time interval Δ t, the time t is usediAs control rod drive line power-off signal cut-off time t1(ii) a Otherwise, selecting new data for redetermination.
Further, the value range of the preset displacement value is 20% -50% of the maximum displacement value.
Further, the time t when the control rod drive wire starts to fall2The determination process specifically comprises the following steps:
selecting the vibration curve from t1Starting a line segment from the moment to a first preset time range;
selecting the moment corresponding to the maximum vibration amplitude in the line segment as the moment t2。
Further, the value range of the first preset time is 200ms-300 ms.
Further, the time t when the control rod drive wire enters the buffer section3The determination process specifically comprises the following steps:
selecting a displacement change part which changes from stable displacement to zero displacement in the displacement curve;
the inflection points in the displacement change portion are selected, and the time corresponding to the first inflection point is taken as the time t3。
Further, the inflection point is screened with a second derivative calculation in the displacement variation part as 0.
Further, the time t when the rod shifts to the bottom by 04The determination process specifically comprises the following steps:
selecting the vibration curve from t1Starting a line segment from the moment to a second preset time range;
selecting the time t corresponding to the maximum vibration amplitude in the line segmentj；
Determining the time t in the displacement curvejThe corresponding actual displacement value;
if the actual displacement value is not greater than the standard displacement value, the time t is usedjAs time t4(ii) a Otherwise, selecting new data for redetermination.
Furthermore, the value range of the standard displacement value is 30-50 mm.
In a second aspect, an automatic processing system for control rod drive line drop performance parameters for a nuclear power station is provided, which includes:
the data acquisition module is used for acquiring a power-off signal, a pull-in current signal, a primary coil voltage signal and a vibration signal of a set position in the rod falling process of the control rod drive wire, and establishing a corresponding power-off signal curve, pull-in current curve, displacement curve and vibration curve;
a time analysis module for determining the control rod drive line power-off signal cutting time t according to the power-off signal curve and the pull-in current curve1Determining the time t when the control rod drive wire begins to fall according to the vibration curve2Determining the time t when the control rod drive wire enters the buffer section according to the displacement curve3According to the vibration curve and the displacement curve, the time t from the rod to the bottom displacement of 04；
A time calculation module for calculating the time t1、t2、t3、t4Performing difference calculation to obtain electromechanical delay time T of rod drop performance parameters1Fast insertion time T2Bar to buffer time T3And total rod drop time T4。
Compared with the prior art, the invention has the following beneficial effects:
1. according to the automatic processing method for the drop rod performance parameters of the control rod drive wire for the nuclear power station, when only 1 primary coil voltage signal is given in the drop rod test process of the control rod drive wire, and the induced electromotive force is not stable, the problems that a common measurement method is not suitable and the workload is large are solved by introducing a determination method for the drop rod performance parameters which are judged by multiple signals together, and the drop rod performance parameters are accurately and automatically acquired;
2. the invention can realize the automatic calculation of the rod drop performance parameters, replaces manual reading, has high measurement precision, stable data and good repeatability, reduces the manual workload and saves the test time.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of data acquisition in an embodiment of the present invention;
FIG. 2 is a diagram illustrating a power-down signal curve according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a pull-in current curve according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of a vibration curve in an embodiment of the present invention;
FIG. 5 is a schematic illustration of a displacement curve in an embodiment of the present invention;
fig. 6 is a block diagram of a system in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1: the method for automatically processing the rod drop performance parameters of the control rod drive wire for the nuclear power station is specifically realized by the following steps.
Step one, as shown in fig. 1, acquiring a power-off signal, a pull-in current signal, a primary coil voltage signal and a vibration signal of a set position in a rod dropping process of a control rod drive wire, and establishing a corresponding power-off signal curve, pull-in current curve, displacement curve and vibration curve.
Specifically, after filtering the power-off signal, a power-off signal curve is established with time as a horizontal axis and voltage as a vertical axis. After the pull-in current signal is subjected to low-pass filtering, a pull-in current curve is established by taking time as a horizontal axis and current as a vertical axis. After the voltage signal of the primary coil is filtered and envelope extracted, a displacement curve is established by taking time as a horizontal axis and displacement as a vertical axis. And establishing a vibration curve by taking time as a horizontal axis and vibration amplitude as a vertical axis. It should be noted that the time of the power-off signal curve, the pull-in current curve, the displacement curve and the vibration curve are kept consistent.
Step two, as shown in fig. 2-5, determining the control rod drive line power-off signal cutting-off time t according to the power-off signal curve and the pull-in current curve1Determining the time t when the control rod drive wire begins to fall according to the vibration curve2Determining the entry of the control rod drive wire into the buffer zone on the basis of the displacement curveTime t3According to the vibration curve and the displacement curve, the time t from the rod to the bottom displacement of 04。
Control rod drive wire power-off signal cutting-off time t1The determination process specifically comprises the following steps: selecting the time t corresponding to the time when the power-off signal curve interrupts the electric signal from the maximum value to 0i(ii) a Selecting a time period delta t corresponding to the time period from the maximum displacement value to the preset displacement value in the pull-in current curve; if at time tiWithin the time interval Δ t, the time t is usediAs control rod drive line power-off signal cut-off time t1(ii) a Otherwise, selecting new data for redetermination.
In this embodiment, the preset displacement value ranges from 20% to 50%, for example, 40%, of the maximum displacement value.
Time t when control rod drive wire begins to fall2The determination process specifically comprises the following steps: selecting the vibration curve from t1A line segment from the moment to the first preset time range; selecting the moment corresponding to the maximum vibration amplitude in the line segment as the moment t2。
In this embodiment, the first preset time is 200ms to 300ms, for example, 250 ms.
Time t when control rod drive wire enters the buffer section3The determination process specifically comprises the following steps: selecting a displacement change part which changes from stable displacement to zero displacement in the displacement curve; the inflection points in the displacement change portion are selected, and the time corresponding to the first inflection point is taken as the time t3。
In the present embodiment, the inflection point is screened with the second derivative calculation in the displacement variation part as 0.
Time t at which the rod bottom displacement is 04The determination process specifically comprises the following steps: selecting the vibration curve from t1Starting a line segment from the moment to a second preset time range; selecting the time t corresponding to the maximum vibration amplitude in the line segmentj(ii) a Determining the time t in the displacement curvejThe corresponding actual displacement value; if the actual displacement value is not greater than the standard displacement value, the time t is usedjAs time t4(ii) a Otherwise, selecting new data to be redetermined. Need to make sure thatIt is noted that the second predetermined time is longer than the first predetermined time.
In this embodiment, the standard displacement value ranges from 30mm to 50mm, for example, 30 mm.
Step three, according to the time t1、t2、t3、t4Performing difference calculation to obtain electromechanical delay time T of rod drop performance parameters1Fast insertion time T2Bar to buffer time T3And total rod drop time T4。
Note that the electromechanical delay time T1Equal to the time t at which the control rod drive wire falls from the beginning2Minus control rod drive line power-off signal cut-off time t1(ii) a Fast insertion time T2Equal to the moment t when the control rod drive wire just enters the buffer section3Minus the time t at which the control rod drive wire falls from the very beginning2(ii) a Buffer time T3Equal to the moment t at which the rod just leaves the buffer zone4Minus the time t when the control rod drive wire just entered the buffer zone3(ii) a Total rod drop time T4Equal to the moment t at which the rod is displaced to the bottom by 05Minus control rod drive line power-off signal cut-off time t1。
Example 2: nuclear power station is with control rod drive wire rod drop performance parameter automatic processing system includes:
the data acquisition module is used for acquiring a power-off signal, a pull-in current signal, a primary coil voltage signal and a vibration signal of a set position in the rod falling process of the control rod drive wire, and establishing a corresponding power-off signal curve, pull-in current curve, displacement curve and vibration curve;
a time analysis module for determining the control rod drive line power-off signal cutting time t according to the power-off signal curve and the pull-in current curve1Determining the time t when the control rod drive wire begins to fall according to the vibration curve2Determining the time t when the control rod drive wire enters the buffer section according to the displacement curve3According to the vibration curve and the displacement curve, the time t from the rod to the bottom displacement of 04；
A time calculation module for calculating the time t1、t2、t3、t4Performing difference calculation to obtain electromechanical delay time T of rod drop performance parameters1Fast insertion time T2Bar to buffer time T3And total rod drop time T4。
The working principle is as follows: in the process of a control rod drive wire rod drop test, when only 1 primary coil voltage signal is given, and the induced electromotive force is not stable, the method for determining the rod drop performance parameters by jointly distinguishing multiple signals is introduced, so that the problems of inapplicability of a common measurement method and high workload are solved, and the accurate and automatic acquisition of the rod drop performance parameters is realized.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The automatic processing method of the rod drop performance parameters of the control rod drive wire for the nuclear power station is characterized by comprising the following steps of:
acquiring a power-off signal, an attraction current signal, a primary coil voltage signal and a vibration signal of a set position in a rod falling process of a control rod drive wire, and establishing a corresponding power-off signal curve, an attraction current curve, a displacement curve and a vibration curve;
determining the control rod drive wire power-off signal cutting moment t according to the power-off signal curve and the pull-in current curve1Determining the time t when the control rod drive wire begins to fall according to the vibration curve2Determining the time t when the control rod drive wire enters the buffer section according to the displacement curve3According to the vibration curve and the displacement curve, the time t from the rod to the bottom displacement of 04；
According to the time t1、t2、t3、t4Performing difference calculation to obtain electromechanical delay time T of rod drop performance parameters1Quick plugTime T2Bar to buffer time T3And total rod drop time T4。
2. The method of claim 1, wherein the control rod drive line power-off signal ablation time t is the time of automatic processing of the rod drop performance parameters of the control rod drive line for the nuclear power plant1The determination process specifically comprises the following steps:
selecting the time t corresponding to the time when the power-off signal curve interrupts the electrical signal from the maximum value to 0i；
Selecting a time period delta t corresponding to the time period from the maximum displacement value to the preset displacement value in the pull-in current curve;
if at time tiWithin the time interval Δ t, the time t is usediAs control rod drive line power-off signal cut-off time t1(ii) a Otherwise, selecting new data for redetermination.
3. The automatic processing method for the rod drop performance parameters of the control rod drive line for the nuclear power station as recited in claim 2, wherein the preset displacement value ranges from 20% to 50% of the maximum displacement value.
4. The automatic processing method for the rod drop performance parameters of the control rod drive line for the nuclear power plant as recited in claim 1, wherein the time t when the control rod drive line starts to drop is a time t when the control rod drive line starts to drop2The determination process specifically comprises the following steps:
selecting the vibration curve from t1Starting a line segment from the moment to a first preset time range;
selecting the moment corresponding to the maximum vibration amplitude in the line segment as the moment t2。
5. The automatic processing method for the control rod drive line drop performance parameters in the nuclear power plant as recited in claim 4, wherein the first preset time is within a range of 200ms to 300 ms.
6. The nuclear power plant control rod drive as set forth in claim 1The method for automatically processing the performance parameters of the drop of the moving wire is characterized in that the time t when the control rod driving wire enters the buffer section3The determination process specifically comprises the following steps:
selecting a displacement change part which changes from stable displacement to zero displacement in the displacement curve;
the inflection points in the displacement change portion are selected, and the time corresponding to the first inflection point is taken as the time t3。
7. The automatic processing method for the rod drop performance parameter of the control rod drive line for the nuclear power plant as recited in claim 6, wherein the inflection point is screened with a second derivative calculation in the displacement variation part as 0.
8. The method as set forth in claim 1, wherein the time t when the rod bottom displacement is 0 is the automatic processing method for the rod drop performance parameter of the control rod drive line for the nuclear power plant4The determination process specifically comprises the following steps:
selecting the vibration curve from t1Starting a line segment from the moment to a second preset time range;
selecting the time t corresponding to the maximum vibration amplitude in the line segmentj；
Determining the time t in the displacement curvejThe corresponding actual displacement value;
if the actual displacement value is not greater than the standard displacement value, the time t is usedjAs time t4(ii) a Otherwise, selecting new data for redetermination.
9. The automatic processing method of the drop rod performance parameters of the control rod drive line for the nuclear power station as recited in claim 8, wherein the standard displacement value ranges from 30mm to 50 mm.
10. Nuclear power station is with automatic processing system of control rod drive wire rod drop performance parameter, characterized by includes:
the data acquisition module is used for acquiring a power-off signal, a pull-in current signal, a primary coil voltage signal and a vibration signal of a set position in the rod falling process of the control rod drive wire, and establishing a corresponding power-off signal curve, pull-in current curve, displacement curve and vibration curve;
a time analysis module for determining the control rod drive line power-off signal cutting time t according to the power-off signal curve and the pull-in current curve1Determining the time t when the control rod drive wire begins to fall according to the vibration curve2Determining the time t when the control rod drive wire enters the buffer section according to the displacement curve3According to the vibration curve and the displacement curve, the time t from the rod to the bottom displacement of 04；
A time calculation module for calculating the time t1、t2、t3、t4Performing difference calculation to obtain electromechanical delay time T of rod drop performance parameters1Fast insertion time T2Bar to buffer time T3And total rod drop time T4。
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