CN111951989A - Method and system for intelligently calibrating rod position measurement parameters - Google Patents
Method and system for intelligently calibrating rod position measurement parameters Download PDFInfo
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- CN111951989A CN111951989A CN202010812024.2A CN202010812024A CN111951989A CN 111951989 A CN111951989 A CN 111951989A CN 202010812024 A CN202010812024 A CN 202010812024A CN 111951989 A CN111951989 A CN 111951989A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/204—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a method and a system for intelligently calibrating rod position measurement parameters, wherein full-stroke rod position signals are input and subjected to filtering processing (the signals can be obtained from a man-machine interface), then voltage values at all theoretical inflection points of each group of coils are obtained through calculation, the voltages are theoretical threshold values of each inflection point, actually, each group of coils only has one threshold value, so all theoretical threshold values of each group of coils need to be fitted into one threshold value according to a certain priority strategy, and the function of automatically calibrating the rod position measurement parameters by one key can be realized based on the threshold values. Compared with the traditional rod position measurement technology, the intelligent rod position calibration parameter technology provided by the invention greatly shortens the time for calibrating the rod position measurement parameters.
Description
Technical Field
The invention relates to the technical field of nuclear power station measurement, in particular to a method and a system for intelligently calibrating rod position measurement parameters.
Background
Control of the reactivity or neutron fluence rate of a nuclear reactor core of a nuclear power plant can be accomplished by moving the position of a control cluster containing neutron absorbers within the core. And the rod position system is used to lift, insert and hold the control bundles and monitor the position of each bundle of control bundles, wherein a series of devices that monitor the position of the bundles in the core are referred to as rod position measurement systems.
The control rod cluster is located a loop high temperature high pressure environment, and the measurement to its position generally utilizes the electromagnetic induction principle, converts control rod position signal into the multiunit voltage signal that the measuring cabinet can use through the mutual inductance between the coil, also is original rod position signal promptly, then converts this record signal into digital signal through filtering, plastic processing, and these several digital signal combines to arrange according to the high low level, just can obtain the rod position code that can follow the real position interval one-to-one of rod cluster.
As shown in fig. 1, in the signal processing process of a full-stroke rod lifter of D groups of coils (the group of coils only has one ascending edge and one descending edge in a full-stroke rod moving process, and is representative), this part of the conventional implementation method is implemented by an analog circuit, and the cured analog circuit has the disadvantages that the adaptability of the circuit is poor, and the adaptability adjustment according to the field situation is rather tedious.
The key index of the rod position measuring system is rod position linearity, and the requirement is intuitively reflected in the upper graph as follows: and adjusting the threshold value of each path to enable the inflection point of the shaped waveform to fall near the theoretical inflection point, wherein the process is referred to as rod position measurement parameter calibration for short. The traditional threshold value is adjusted through an adjusting knob, and the most obvious defect of the method is that the threshold value cannot be accurately adjusted; meanwhile, the parameters cannot be quantified, and the group of parameters cannot be stored and copied; in addition, the traditional parameter adjusting method has a drift phenomenon, namely, set parameters can change in the running process of equipment, which causes certain obstruction to parameter calibration and debugging work.
The traditional method for calibrating the rod position linearity parameters can be summarized as manual touch cable type calibration, namely the effect is seen through continuous adjusting knobs, the knobs are adjusted again through effect analysis, the effect is seen again, the process is repeated until the rod position linearity meets the requirements, and the method is extremely low in efficiency. The manual error and touch method introduced by manual operation leads to tedious calibration operation, high work difficulty (the calibration work requires operators to have abundant experience) and incapability of ensuring calibration quality.
Disclosure of Invention
In order to solve the problems that the traditional method for calibrating linearity is complex in operation, low in efficiency and the like, so that the calibration work is long in time consumption and the calibration quality cannot be guaranteed, the invention provides an intelligent method for calibrating rod position measurement parameters.
The invention is realized by the following technical scheme:
a method of intelligently calibrating rod position measurement parameters, the method comprising the steps of:
step one, acquiring an original rod position signal of a full stroke and carrying out filtering processing;
secondly, calculating to obtain voltage values of all theoretical turning points of each group of coils based on the rod position signals after filtering;
step three, fitting the voltage values of all theoretical inflection points of each group of coils into a threshold value according to a preset priority strategy, and using the threshold value as the theoretical threshold value of the group of coils;
and step four, automatically calibrating the rod position measurement parameters according to the theoretical threshold value obtained in the step three.
Compared with the traditional mode of calibrating rod position measurement parameters by adopting a solidified analog circuit and a manual groping mode, the method realizes the processes of filtering and shaping of original rod position signals and calibrating the rod position measurement parameters by utilizing the automation and digitization of computer technology, and has the following basic principles: inputting a full-stroke rod position signal, filtering the full-stroke rod position signal (the signal can be obtained from a human-computer interface), calculating and obtaining voltage values of all theoretical inflection points of each group of coils, wherein the voltages are theoretical threshold values of each inflection point, actually, each group of coils only has one threshold value, so that all the theoretical threshold values of each group of coils need to be fitted into one threshold value according to a certain priority strategy, and based on the threshold values, the function of automatically calibrating rod position measurement parameters by one key can be realized, namely, the rod position measurement parameters are intelligently calibrated on line.
Optionally, the present invention may calibrate the rod position measurement parameter in real time, that is, in the first step of the present invention, the original rod position signal of the full stroke may be obtained through the detection of the actual rod position measurement device.
Optionally, the method can realize off-line calibration of the rod position measurement parameters, that is, the first step of the method can obtain the original rod position signal of the full stroke through the simulation operation of the virtual rod position measurement device.
Optionally, when the invention realizes offline calibration of the rod position measurement parameters, the method is realized by setting a set of virtual instruments of the rod position measurement device, and the virtual rod position measurement device of the invention is specifically realized in the following process:
firstly, algorithm simulation software is adopted to complete the algorithm simulation of the rod position measuring equipment software and verify the algorithm simulation;
after the virtual instrument is verified to be feasible, embedding a simulation algorithm into background software of the virtual instrument, and designing a human-computer interaction interface to obtain virtual rod position measuring equipment based on the virtual instrument;
and importing the waveform file recorded with the original rod position signal into the virtual rod position measuring equipment to obtain an operation result which is consistent with the real operation condition.
Optionally, under the influence of the permeability of a medium on the rod position detector, the variation rules of the induced voltages at different positions are inconsistent, and the phenomenon restricts that each inflection point cannot fall on a theoretical inflection point by the same threshold value, namely the rod position linearity cannot reach the optimal state. Therefore, in the fourth step of the present invention, the rod position measurement parameters are automatically calibrated: and dividing the full stroke into a plurality of subsections according to the rule of the change of the induction voltage, and ensuring that the change rule of the induction voltage in each subsection is consistent so as to ensure that each inflection point can fall on a theoretical inflection point.
On the other hand, the invention also provides a system for intelligently calibrating the rod position measurement parameters, which comprises a signal input unit, a calculation unit, a fitting unit and a calibration unit;
the signal input unit is used for acquiring original rod position signals of a full stroke and carrying out filtering processing;
the computing unit is used for obtaining the rod position signals after filtering processing and computing voltage values at all theoretical turning points of each group of coils;
the fitting unit is used for fitting the voltage values of all theoretical turning points of each group of coils into a threshold value according to a preset priority strategy, and the threshold value is used as the theoretical threshold value of the group of coils;
and the calibration unit automatically calibrates the rod position measurement parameters according to the theoretical threshold value of each group of coils.
Optionally, the signal input unit of the present invention may obtain an original rod position signal of a full stroke through detection of an actual rod position measuring device.
Optionally, the signal input unit of the present invention may obtain an original rod position signal of a full stroke through a simulation operation of the virtual rod position measuring device.
Optionally, the virtual rod position measuring device of the present invention is constructed as follows:
firstly, algorithm simulation software is adopted to complete the algorithm simulation of the rod position measuring equipment software and verify the algorithm simulation;
after the virtual instrument is verified to be feasible, embedding a simulation algorithm into background software of the virtual instrument, and designing a human-computer interaction interface to obtain virtual rod position measuring equipment based on the virtual instrument;
and importing the waveform file recorded with the original rod position signal into the virtual rod position measuring equipment to obtain an operation result which is consistent with the real operation condition.
Optionally, the calibration unit of the present invention divides the full stroke into a plurality of subsections according to the rule of the variation of the induced voltage, so as to ensure that the variation rule of the induced voltage in each subsection is constant, and to ensure that each inflection point can fall on the theoretical inflection point.
The invention has the following advantages and beneficial effects:
1. compared with the traditional rod position measuring technology, the intelligent rod position measuring parameter calibrating technology provided by the invention greatly shortens the time for calibrating the rod position measuring parameters; the technology provided by the invention adopts a computer technology to carry out a digital and automatic processing process, thereby greatly lightening the work load of field maintenance or technical personnel, and simultaneously carrying out square wave operation and debugging.
2. The method has the advantages that the calibrated parameters are theoretical optimal parameters obtained by the computer through special training analysis and automatic calculation according to the original rod position signals, the parameter calibration quality is guaranteed, meanwhile, better guarantee is provided for long-term stable operation of the rod position measuring equipment, and further, the economic benefit of the nuclear power station is improved to a certain extent.
3. The rod position measurement parameter calibration can be realized in real time or off-line, and the application range is wide.
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 the signal processing of a full stroke lifter for group D coils according to the present invention.
FIG. 2 is a waveform diagram of an original rod position signal obtained by the present invention.
FIG. 3 is a graph of the deviation step numbers of the full stroke given stick position and the measured stick position.
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
Traditional method of calibrating linearity mainly adopts manual touch-cord type calibration, namely through continuous adjust knob (adjustment threshold), then moves the stick and sees the effect, adjust knob once more through effect analysis, see the effect again, repeat this process until stick position linearity satisfies the requirement, complex operation and inefficiency scheduling problem lead to calibration work consuming time longer and calibration quality can't guarantee, this embodiment provides a method of intelligent calibration stick position measurement parameter.
According to the method, the original rod position signal is input, the theoretically optimal rod position measurement parameter is automatically calculated, field maintenance personnel or technical support personnel are relieved from heavy debugging work, the most complicated work is achieved by calculating the theoretical threshold value of each coil in the rod position signal in real time through a computer, the rod position measurement parameter is automatically calibrated according to the calculated theoretical threshold value, and the efficiency and the quality of calibrating the rod position measurement parameter are greatly improved.
Moreover, the method can also realize off-line calibration of the rod position measurement parameters, so that support personnel can finish the work of calibrating the rod position measurement parameters without arriving at the site.
Specifically, the method of this embodiment includes the following steps:
step one, acquiring an original rod position signal of a full stroke and carrying out filtering processing.
In this embodiment, when the rod position measurement parameters are calibrated on line, the original rod position signals detected by the actual rod position measurement device are processed.
In the embodiment, when the off-line rod position measurement parameters are calibrated, firstly, the algorithm simulation of the rod position testing equipment software is completed by means of the algorithm simulation software, under the condition that the simulation effect is verified to be feasible, the simulation algorithm is further embedded into the background software of the virtual instrument, meanwhile, a human-computer interaction interface (simulating real equipment) is designed, the virtual instrument is a pure software device, the connection of a hardware device for collecting voltage waveforms is not needed, only the original rod position signals are recorded in a waveform file by adopting a recorder and other devices in advance, and then the virtual instrument is led in, so that the operation effect which is consistent with the real condition can be obtained. If the algorithm for automatically calculating the rod position measurement parameters is embedded into the virtual instrument, the function of off-line intelligent calibration of the rod position measurement parameters can be realized.
And step two, calculating to obtain voltage values of all theoretical turning points of each group of coils based on the rod position signals after filtering processing.
And step three, fitting the voltage values of all theoretical inflection points of each group of coils into a threshold value according to a preset priority strategy, and using the threshold value as the theoretical threshold value of the group of coils.
And step four, automatically calibrating the rod position measurement parameters according to the theoretical threshold value obtained in the step three.
In addition, considering the influence of the permeability of a medium on the rod position detector, the variation rules of the induced voltages at different positions are inconsistent, and the phenomenon restricts that each inflection point cannot fall on a theoretical inflection point by the same threshold value, namely the rod position linearity cannot reach the optimal state. In the embodiment, a segmented threshold setting technology is adopted when the rod position measurement parameters are automatically calibrated, the full stroke is divided into a plurality of subsections according to the rule of induction voltage change, the induction voltage change rule in each subsection is ensured to be consistent, and thus each inflection point can be ensured to fall on a theoretical inflection point, and the rod position linearity is further optimized.
Example 2
Based on the foregoing embodiment 1, this embodiment provides a system for intelligently calibrating rod position measurement parameters, including: the device comprises a signal input unit, a calculation unit, a fitting unit and a calibration unit.
The signal input unit of the embodiment is used for acquiring an original rod position signal of a full stroke and performing filtering processing; that is, the signal input unit of the present embodiment is configured to perform the step one set forth in embodiment 1 above.
The calculating unit of the embodiment is used for obtaining the rod position signals after filtering processing and calculating voltage values at all theoretical turning points of each group of coils; that is, the calculation unit of the present embodiment is configured to execute step two set forth in embodiment 1 above.
The fitting unit of this embodiment is configured to fit voltage values at all theoretical inflection points of each group of coils into a threshold according to a preset priority policy, and use the threshold as a theoretical threshold of the group of coils; that is, the fitting unit of the present embodiment is configured to perform step three set forth in embodiment 1 above.
The calibration unit of the embodiment automatically calibrates the rod position measurement parameters according to the theoretical threshold of each group of coils; that is, the calibration unit of the present embodiment is configured to perform step four set forth in embodiment 1 above.
Example 3
In this embodiment, the method provided in embodiment 1 or the system provided in embodiment 2 is used to perform automatic calibration of rod position measurement parameters on a group of acquired original rod position signals, and the specific implementation process is as follows:
1. the original rod position signal is obtained on-line by the rod position measuring device or obtained by simulating by the rod position measuring device, as shown in fig. 2.
2. The method proposed in embodiment 1 or the system proposed in embodiment 2 is adopted to perform automatic rod position measurement parameter calibration on the original rod position signal shown in fig. 2, and write the calibrated parameter into the rod position measuring device to operate, and perform a full-stroke rod lifting and inserting operation to obtain an operation result shown in fig. 3.
The deviation between the given rod position and the measured rod position automatically recorded by the equipment in the full-stroke rod lifting and inserting process shown in the figure 3 can be known as the step chart: in the action of the full stroke, the deviation steps are all in the range of [ -6, +6], and the result completely meets the requirement of the rod position control system on the rod position linearity, so that the method for intelligently calibrating the rod position measurement parameters is proved to be practical.
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-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, 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. A method for intelligently calibrating rod position measurement parameters is characterized by comprising the following steps:
step one, acquiring an original rod position signal of a full stroke and carrying out filtering processing;
secondly, calculating to obtain voltage values of all theoretical turning points of each group of coils based on the rod position signals after filtering;
step three, fitting the voltage values of all theoretical inflection points of each group of coils into a threshold value according to a preset priority strategy, and using the threshold value as the theoretical threshold value of the group of coils;
and step four, automatically calibrating the rod position measurement parameters according to the theoretical threshold value obtained in the step three.
2. The method of claim 1, wherein the step one is detecting the raw rod position signal of the full stroke by the actual rod position measuring device.
3. The method of claim 1, wherein the step one is to obtain a full stroke raw rod position signal by simulating operation of a virtual rod position measuring device.
4. The method for intelligently calibrating rod position measurement parameters according to claim 3, wherein the virtual rod position measurement device is implemented by the following steps:
firstly, algorithm simulation software is adopted to complete the algorithm simulation of the rod position measuring equipment software and verify the algorithm simulation;
after the virtual instrument is verified to be feasible, embedding a simulation algorithm into background software of the virtual instrument, and designing a human-computer interaction interface to obtain virtual rod position measuring equipment based on the virtual instrument;
and importing the waveform file recorded with the original rod position signal into the virtual rod position measuring equipment to obtain an operation result which is consistent with the real operation condition.
5. The method according to claim 1, wherein the step four comprises automatically calibrating the rod position measurement parameters by: and dividing the full stroke into a plurality of subsections according to the rule of the change of the induction voltage, and ensuring that the change rule of the induction voltage in each subsection is consistent so as to ensure that each inflection point can fall on a theoretical inflection point.
6. A system for intelligently calibrating rod position measurement parameters is characterized by comprising a signal input unit, a calculating unit, a fitting unit and a calibrating unit;
the signal input unit is used for acquiring original rod position signals of a full stroke and carrying out filtering processing;
the computing unit is used for obtaining the rod position signals after filtering processing and computing voltage values at all theoretical turning points of each group of coils;
the fitting unit is used for fitting the voltage values of all theoretical turning points of each group of coils into a threshold value according to a preset priority strategy, and the threshold value is used as the theoretical threshold value of the group of coils;
and the calibration unit automatically calibrates the rod position measurement parameters according to the theoretical threshold value of each group of coils.
7. The system of claim 6, wherein the signal input unit is capable of obtaining a full stroke raw rod position signal detected by an actual rod position measuring device.
8. The system of claim 6, wherein the signal input unit is operable to obtain a full stroke raw rod position signal by simulating a virtual rod position measuring device.
9. The system for intelligently calibrating rod position measurement parameters according to claim 8, wherein said virtual rod position measuring device is constructed by the following steps:
firstly, algorithm simulation software is adopted to complete the algorithm simulation of the rod position measuring equipment software and verify the algorithm simulation;
after the virtual instrument is verified to be feasible, embedding a simulation algorithm into background software of the virtual instrument, and designing a human-computer interaction interface to obtain virtual rod position measuring equipment based on the virtual instrument;
and importing the waveform file recorded with the original rod position signal into the virtual rod position measuring equipment to obtain an operation result which is consistent with the real operation condition.
10. The system for intelligently calibrating rod position measurement parameters according to claim 6, wherein the calibration unit divides the full stroke into a plurality of subsections according to the rule of induced voltage change, and ensures that the rule of induced voltage change in each subsection is constant, so as to ensure that each inflection point can fall on a theoretical inflection point.
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| CN112509718A (en) * | 2020-11-30 | 2021-03-16 | 福建福清核电有限公司 | Gray code processing clamping piece threshold setting device and method for nuclear power station rod position system |
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