CN112489836A - Rod position measuring method and system for nuclear power station by using auxiliary coil calibration - Google Patents
Rod position measuring method and system for nuclear power station by using auxiliary coil calibration Download PDFInfo
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- CN112489836A CN112489836A CN202011352316.9A CN202011352316A CN112489836A CN 112489836 A CN112489836 A CN 112489836A CN 202011352316 A CN202011352316 A CN 202011352316A CN 112489836 A CN112489836 A CN 112489836A
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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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- 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
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- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a rod position measuring method and a rod position measuring system for a nuclear power station by utilizing auxiliary coil calibration, wherein the method comprises the following steps: acquiring an output signal of the auxiliary coil and an output signal of the measuring coil; modulating an output signal of the auxiliary coil to obtain a modulated signal; calibrating the output signal of the measuring coil by using the modulation signal to obtain a calibrated measuring coil signal; and comparing the calibrated measuring coil signal with a set value to obtain a rod position measuring signal representing rod position information. The output signal of the auxiliary coil of the rod position detector is used for correcting the output signal of the measuring coil, the output of the auxiliary coil is adjusted and then is integrated with the measuring coil to obtain a corrected measuring coil signal, the high-low level conversion of the corrected measuring coil is obvious, and the gourd wave is obviously inhibited/eliminated.
Description
Technical Field
The invention belongs to the technical field of nuclear reactor rod position detection, and particularly relates to a rod position measuring method and a rod position measuring system for a nuclear power station by utilizing auxiliary coil calibration.
Background
The nuclear power station using control rods for reactor reactivity adjustment needs to monitor the position of the control rods in the reactor core in real time, and the current common method of control rod position sensors (rod position detectors for short) is to measure the position of the control rods by using the electromagnetic induction principle, and the method winds different types of coils along the stroke of the control rods:
(1) a coil is continuously wound on a rod position detector along the stroke of a control rod, the coil can be called as a primary coil, and the primary coil is generally used for outputting current to provide an excitation magnetic field for a secondary coil;
(2) the coil is wound along the stroke of a control rod at intervals, is called a secondary coil, and can be subdivided into an auxiliary coil and a measuring coil according to different purposes:
the head and tail secondary side coils are mutually connected for signal output and can be called as auxiliary coils, and the auxiliary coils are generally used for current regulation of the primary side coils;
in addition to the first and last secondary coils, the other secondary coils, which provide signals for representing control rod position information, may be referred to as measurement coils, and are generally divided into a plurality of groups (e.g., A, B, C, D, E five groups), and the coils in the same group are connected with each other for outputting signals of the group. According to the position of the control rod, each group of coils can output signals with different voltage levels, and the signals are converted into high and low level signals to reflect the position information of the control rod. The actual position of the control rod in the core can be obtained by grouping and coding different groups of measuring coils.
Due to factors such as interference between coils and end effect, part of the measuring coils have the problem of unobvious high-low voltage conversion, and even when the control rod is positioned at a position where a certain group of measuring coils should output low voltage, the actual output of the group of coils is higher than the conversion node of the group of measuring coils (the waveform formed by the output signal in the case can be generally called as a gourd wave), so that the difficulty of measuring the rod position is increased, the precision of measuring the rod position is reduced, and the requirement of measuring the accuracy of the rod position is difficult to meet.
Disclosure of Invention
In order to overcome the technical problem that in the conventional rod position measuring technology, due to factors such as interference between measuring coils, end effect and the like, high-low voltage conversion of part of the measuring coils is not obvious, so that the rod position measuring precision is low, the invention provides a rod position measuring method for a nuclear power station by utilizing auxiliary coil calibration.
The invention is realized by the following technical scheme:
a rod position measurement method using an auxiliary coil calibration for a nuclear power plant, the method comprising the steps of:
acquiring an output signal of the auxiliary coil and an output signal of the measuring coil;
modulating an output signal of the auxiliary coil to obtain a modulated signal;
calibrating the output signal of the measuring coil by using the modulation signal to obtain a calibrated measuring coil signal;
and comparing the calibrated measuring coil signal with a set value to obtain a rod position measuring signal representing rod position information.
The output signal of the auxiliary coil of the rod position detector is used for correcting the output signal of the measuring coil, the output of the auxiliary coil is adjusted and then is integrated with the measuring coil to obtain a corrected measuring coil signal, the high-low level conversion of the corrected measuring coil is obvious, and the gourd wave is obviously inhibited/eliminated.
Preferably, the specific process of modulating the output signal of the auxiliary coil in the present invention is as follows:
carrying out first proportional adjustment on the auxiliary coil to obtain a first modulation signal;
carrying out second proportion adjustment and exponential transformation on the auxiliary coil to obtain a second modulation signal;
and synthesizing the first modulation signal and the second modulation signal to obtain a modulation signal.
Preferably, the present invention further comprises, before modulating the output signal of the auxiliary coil:
and filtering the output signal of the auxiliary coil.
Preferably, the filtering process of the output signal of the auxiliary coil is specifically low-pass filtering the output signal of the auxiliary coil to remove an interference signal or an invalid signal.
Preferably, the specific process of calibrating the output signal of the measurement coil by using the modulation signal of the present invention is as follows:
and carrying out comprehensive operation on the modulation signal and the output signal of the measuring coil to obtain a calibrated measuring coil signal.
On the other hand, the invention also provides a rod position measuring system for a nuclear power station, which is calibrated by using the auxiliary coil, and the system comprises a signal acquisition module, a modulation module, a calibration module and a comparison module;
the signal acquisition module is used for acquiring an output signal of the auxiliary coil and an output signal of the measuring coil;
the modulation module is used for modulating the output signal of the auxiliary coil to obtain a modulation signal;
the calibration module is used for calibrating the output signal of the measuring coil by using the modulation signal to obtain a calibrated measuring coil signal;
and the comparison module compares the calibrated measuring coil signal with a set value to obtain a rod position measuring signal representing rod position information.
Preferably, the modulation module of the present invention includes a first adjusting unit, a second adjusting unit, an exponential transforming unit and a synthesizing unit;
the first adjusting unit performs first proportional adjustment on the auxiliary coil to obtain a first modulation signal;
the second adjusting unit is used for performing second proportion adjustment on the auxiliary coil, and the exponential transformation unit is used for performing exponential transformation on the signal subjected to proportion adjustment by the second adjusting module to obtain a second modulation signal;
the synthesis unit is used for synthesizing the first modulation signal and the second modulation signal to obtain a modulation signal.
Preferably, the system of the present invention further comprises a filtering module;
the filtering module is used for filtering the output signal of the auxiliary coil and sending the filtered signal to the modulation module for modulation processing.
Preferably, the filtering module of the present invention employs a low-pass filter for removing an interference signal or an invalid signal from the output signal of the auxiliary coil.
Preferably, the calibration module of the present invention performs a comprehensive operation on the modulation signal and the output signal of the measurement coil to obtain a calibrated measurement coil signal.
The invention has the following advantages and beneficial effects:
1. according to the method, the auxiliary coil is used for conditioning the signal of the measuring coil, so that the method for inhibiting the gourd wave can obviously improve the voltage level of the theoretical high voltage, reduce the voltage level of the theoretical low voltage, obtain an obvious high-low voltage inflection point, further reduce the difficulty in rod position measurement and improve the rod position measurement precision.
2. The invention can utilize the existing rod position detector of the nuclear power plant, does not relate to the replacement of the rod position detector, and can be applied to a newly-built nuclear power plant and an in-service nuclear power plant.
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 flow chart of the method of the present invention.
Fig. 2 is a schematic block diagram of the system of the present invention.
Fig. 3 shows the measurement of the rod position without calibration using the auxiliary coil.
Fig. 4 shows the measurement result of the rod position calibrated by the auxiliary coil.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
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
Compared with the prior rod position measuring technology, the method has the technical problems that due to factors such as interference between rod position measuring coils and end effect, high-low voltage conversion of part of the measuring coils is not obvious, so that the rod position measuring precision is low, and the precision requirement of rod position measurement cannot be met.
As shown in fig. 1, the measurement method of the present embodiment includes the following steps:
(1) the output signal of the auxiliary coil and the output signal of the measuring coil are acquired.
(2) And carrying out low-pass filtering processing on the output signal of the auxiliary coil to remove invalid signals and interference signals in the output signal of the auxiliary coil.
(3) And modulating the output signal of the auxiliary coil to obtain a modulation signal.
Specifically, the specific process of modulating the output signal of the auxiliary coil in this embodiment is as follows:
carrying out first proportional adjustment on the auxiliary coil to obtain a first modulation signal;
carrying out second proportion adjustment and exponential transformation on the auxiliary coil to obtain a second modulation signal;
and synthesizing the first modulation signal and the second modulation signal to obtain a modulation signal.
(4) And calibrating the output signal of the measuring coil by using the modulation signal to obtain a calibrated measuring coil signal.
In this embodiment, the modulation signal and the output signal of the measurement coil are subjected to an integrated operation (such as addition or multiplication to correct the output signal of the measurement coil), so as to obtain a calibrated measurement coil signal.
(5) And comparing the calibrated measuring coil signal with a set value to obtain a rod position measuring signal representing rod position information.
According to the measuring method, firstly, links such as low-pass filtering, first proportion adjustment, second proportion adjustment and index transformation are used for modulating and transforming the auxiliary signals, the output signals of the auxiliary coils after modulation and transformation are used for calibrating the output signals of the measuring coils, and therefore the conditioning effect of the auxiliary coils on the measuring coils is optimized.
Example 2
Based on the measurement method provided in embodiment 1, this embodiment also provides a rod position measurement system for a nuclear power plant, which is calibrated by using an auxiliary coil.
As shown in fig. 2, the measurement system of the present embodiment includes a signal acquisition module, a filtering module, a modulation module, a calibration module, and a comparison module;
the signal acquisition module is used for acquiring an output signal of the auxiliary coil and an output signal of the measuring coil;
the filtering module is used for filtering the output signal of the auxiliary coil and sending the filtered signal to the modulation module for modulation processing.
The modulation module is used for modulating the output signal of the auxiliary coil to obtain a modulation signal;
the calibration module is used for calibrating the output signal of the measuring coil by using the modulation signal to obtain a calibrated measuring coil signal;
and the comparison module compares the calibrated measuring coil signal with a set value to obtain a rod position measuring signal representing rod position information.
The modulation module of the embodiment specifically comprises a first adjusting unit, a second adjusting unit, an exponential transformation unit and a synthesis unit;
the first adjusting unit performs first proportional adjustment on the auxiliary coil to obtain a first modulation signal;
the second adjusting unit is used for performing second proportion adjustment on the auxiliary coil, and the exponential transformation unit is used for performing exponential transformation on the signal subjected to proportion adjustment by the second adjusting module to obtain a second modulation signal;
the synthesis unit is used for synthesizing the first modulation signal and the second modulation signal to obtain a modulation signal.
The filtering module of this embodiment employs a low-pass filter for removing an interference signal or an invalid signal in the output signal of the auxiliary coil.
The calibration module of this embodiment specifically performs a comprehensive operation (an addition or a multiplication operation is used to correct the output signal of the measurement coil) on the modulation signal and the output signal of the measurement coil, so as to obtain a calibrated measurement coil signal.
Example 3
In this embodiment, the measurement method proposed in embodiment 1 and the measurement system proposed in embodiment 2 are applied to a rod position measurement cabinet of a third-generation nuclear power plant, and are debugged in combination with a rod position detector.
This embodiment obtains the stick position measurement result without calibration using the auxiliary coil as shown in fig. 3 and the stick position measurement result with calibration using the auxiliary coil as shown in fig. 4. Wherein, all include four curves in fig. 3 and fig. 4, from last to being down in proper order:
measuring coil original waveforms (taking A group of coils as an example);
calculating the waveform of the envelope curve;
a bit code representing the rod position measuring signal is obtained according to the envelope curve;
theoretical bit codes as a reference for comparison.
This example can be seen by comparing the test curves in fig. 3 and 4.
(1) Through the curve at the position of phi, it can be seen that:
the envelope curve of the measuring coil obtained without using the auxiliary coil for calibration cannot inhibit the voltage level of theoretical low voltage, the inflection point of high and low voltages is not obvious, and the situation that the theoretical low voltage level is higher than the inflection point exists;
the voltage level of theoretical low voltage is effectively inhibited by using an envelope curve of a measuring coil obtained by calibrating an auxiliary coil, and the high voltage and the low voltage are clearly and obviously converted;
(2) through the second and third parts of the curve, it can be seen that:
the bit code representing the rod position measuring signal obtained without using the auxiliary coil for calibration has abnormal jitter and burrs, and the rod position measuring signal cannot be effectively represented;
the bit code representing the rod position measuring signal obtained by utilizing the auxiliary coil for calibration has no abnormal jitter and burr, and the rod position measuring signal can be effectively represented;
(3) through the fourth and the fifth parts of the curve, it can be seen that:
the bit code representing the rod position measurement signal obtained without using the auxiliary coil for calibration has larger difference with the bit code theoretically required, and the rod position measurement precision is low;
the bit code representing the rod position measurement signal obtained by utilizing the auxiliary coil for calibration has high matching degree with the theoretically required bit code, and the rod position measurement precision is high.
In conclusion, the rod position measuring method using the auxiliary coil for calibration can effectively inhibit the voltage level of theoretical low voltage, present obvious high and low voltage inflection points, eliminate abnormal jitter and burrs, and improve the rod position measuring precision.
The method for conditioning the signal of the measuring coil by using the auxiliary coil is applied to the rod position measurement of the nuclear power station for the first time, the end effect of the measuring coil can be effectively inhibited/eliminated, and an obvious high-low voltage inflection point is extracted from the signal of the measuring coil. The method effectively reduces the difficulty of rod position measurement, improves the rod position measurement precision, and eliminates abnormal inflection points.
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 rod position measuring method using an auxiliary coil calibration for a nuclear power plant, characterized by comprising the steps of:
acquiring an output signal of the auxiliary coil and an output signal of the measuring coil;
modulating an output signal of the auxiliary coil to obtain a modulated signal;
calibrating the output signal of the measuring coil by using the modulation signal to obtain a calibrated measuring coil signal;
and comparing the calibrated measuring coil signal with a set value to obtain a rod position measuring signal representing rod position information.
2. The rod position measuring method using the auxiliary coil calibration for the nuclear power plant as claimed in claim 1, wherein the specific process of modulating the output signal of the auxiliary coil is as follows:
carrying out first proportional adjustment on the auxiliary coil to obtain a first modulation signal;
carrying out second proportion adjustment and exponential transformation on the auxiliary coil to obtain a second modulation signal;
and synthesizing the first modulation signal and the second modulation signal to obtain a modulation signal.
3. The rod position measuring method using an auxiliary coil calibration for a nuclear power plant according to claim 1 or 2, further comprising, before modulating an output signal of the auxiliary coil:
and filtering the output signal of the auxiliary coil.
4. The rod position measuring method using the auxiliary coil calibration for the nuclear power plant as claimed in claim 3, wherein the filtering process of the output signal of the auxiliary coil is specifically low-pass filtering of the output signal of the auxiliary coil to remove the interference signal or the null signal.
5. The rod position measuring method using the auxiliary coil calibration for the nuclear power plant as claimed in claim 1 or 2, wherein the specific process of calibrating the output signal of the measuring coil using the modulation signal is as follows:
and carrying out comprehensive operation on the modulation signal and the output signal of the measuring coil to obtain a calibrated measuring coil signal.
6. A rod position measuring system for a nuclear power station and calibrated by using an auxiliary coil is characterized by comprising a signal acquisition module, a modulation module, a calibration module and a comparison module;
the signal acquisition module is used for acquiring an output signal of the auxiliary coil and an output signal of the measuring coil;
the modulation module is used for modulating the output signal of the auxiliary coil to obtain a modulation signal;
the calibration module is used for calibrating the output signal of the measuring coil by using the modulation signal to obtain a calibrated measuring coil signal;
and the comparison module compares the calibrated measuring coil signal with a set value to obtain a rod position measuring signal representing rod position information.
7. The rod position measuring system calibrated by the auxiliary coil for the nuclear power plant as claimed in claim 6, wherein the modulation module comprises a first adjusting unit, a second adjusting unit, an exponential transformation unit and a synthesis unit;
the first adjusting unit performs first proportional adjustment on the auxiliary coil to obtain a first modulation signal;
the second adjusting unit is used for performing second proportion adjustment on the auxiliary coil, and the exponential transformation unit is used for performing exponential transformation on the signal subjected to proportion adjustment by the second adjusting module to obtain a second modulation signal;
the synthesis unit is used for synthesizing the first modulation signal and the second modulation signal to obtain a modulation signal.
8. The rod position measuring system calibrated by the auxiliary coil for the nuclear power plant as claimed in claim 6 or 7, characterized in that the system further comprises a filtering module;
the filtering module is used for filtering the output signal of the auxiliary coil and sending the filtered signal to the modulation module for modulation processing.
9. The rod position measuring system using the auxiliary coil calibration for the nuclear power plant as claimed in claim 8, wherein the filtering module employs a low pass filter for removing a disturbance signal or a null signal in the output signal of the auxiliary coil.
10. The rod position measuring system using the auxiliary coil for calibration in the nuclear power plant as claimed in claim 6 or 7, wherein the calibration module performs a comprehensive operation on the modulation signal and the output signal of the measuring coil to obtain a calibrated measuring coil signal.
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| CN101794628A (en) * | 2010-03-12 | 2010-08-04 | 清华大学 | Rod position measuring system based on error tape correction method |
| CN106448768A (en) * | 2016-12-12 | 2017-02-22 | 中广核工程有限公司 | Nuclear power plant control rod position measuring system and method |
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Application publication date: 20210312 |