Rod position measurement and parameter adjustment method and system and medium

Abstract

The invention relates to the field of nuclear power plant rod position measurement system adjustment and calibration, in particular to a rod position measurement and parameter adjustment and calibration method and system and a medium, and the method comprises the steps: respectively adjusting the induction voltage of each secondary coil to be a preset calibration induction voltage according to a rod position detector and a secondary coil group; acquiring a bump peak voltage and a small trough voltage of each secondary coil of the corresponding rod position detector in the full-stroke movement process of the control rod; and for each secondary coil group, calculating an optimal comparator threshold voltage and an optimal hysteresis voltage range according to the bump peak voltage and the small trough voltage of the corresponding secondary coil, and taking the optimal comparator threshold voltage and the optimal hysteresis voltage range as the threshold voltage and the hysteresis voltage range of the threshold comparator. Compared with a traditional method, the method has the advantages that the number of trial times of blind parameter adjustment is greatly reduced, the static test duration is shortened, the adjustment efficiency of a rod position measurement system is remarkably improved while the position indication precision of the control rod is guaranteed, and the operation and maintenance cost of a nuclear power unit is saved.

Description

Technical Field

[0001] The present invention relates to the field of calibration of rod position measurement systems in nuclear power plants, and particularly to a method, system and medium for rod position measurement and parameter calibration. Background Art

[0002] The rod position measurement system is one of the key instrument control systems in a nuclear power plant, and is used to accurately measure the actual position of control rods in the reactor core. This system detects the displacement of the drive rod through rod position detectors installed outside the control rod drive mechanism, and then determines the insertion depth of the control rod connected thereto. The core parameters of the rod position measurement system include analog circuit parameters of the rod position detector, comparator threshold voltage, hysteresis voltage, etc. These parameters directly affect the accuracy and reliability of rod position measurement. To ensure the accuracy of the control rod position indication, it is necessary to calibrate the parameters of the rod position measurement system so that its output signal matches the actual position of the control rod. Reasonable parameter settings can help the system promptly detect abnormal conditions such as out-of-step, slipping, and jamming of the control rod during movement, and ensure the safe operation of the reactor.

[0003] The traditional method for calibrating the parameters of the rod position measurement system is to configure unified analog circuit cards, comparator threshold voltages, and hysteresis voltages for all rod position detectors, and then through dynamic and static linear tests, check and eliminate the abnormal jump or Gray code flip of the rod position indication one by one. This "one-size-fits-all" parameter setting and the calibration process of repeated trial and error have obvious deficiencies: the calibration process needs to be carried out under static conditions, the test cycle is long, and the parameter optimization efficiency is low, bringing unnecessary labor and time costs to the operation and maintenance of nuclear power units. Summary of the Invention

[0004] To solve the above problems, the present invention provides a method, system and medium for rod position measurement and parameter calibration.

[0005] The first aspect of the present invention discloses a method for calibrating the parameters of a rod position measurement system. The rod position measurement system includes a plurality of rod position detectors corresponding to a plurality of control rods respectively. Each rod position detector includes a plurality of secondary coil groups and a threshold comparator corresponding to the secondary coil group. The parameter calibration method includes:

[0006] Adjust the induced voltage of each secondary coil to a preset calibration induced voltage according to the rod position detector and the secondary coil group. The calibration induced voltages of the secondary coils in the same secondary coil group are the same;

[0007] Obtain the peak voltage of the bulge and the valley voltage of the small wave of each secondary coil of the corresponding rod position detector during the full stroke movement of the control rod;

[0008] For each secondary coil group, calculate the optimal comparator threshold voltage and the optimal hysteresis voltage range based on the bulge peak voltage and the small wave valley voltage of the corresponding secondary coil, and use them as the threshold voltage and the hysteresis voltage range of the threshold comparator.

[0009] Further, the preset method for calibrating the induced voltage includes:

[0010] Obtain the induced voltages of all secondary coils when all control rods are at the specified rod positions;

[0011] Calculate the calibrated induced voltage corresponding to each secondary coil group based on the induced voltages of all secondary coils.

[0012] Further, the specified rod position refers to the rod position where the Gray codes output by all threshold comparators are all the first logical value.

[0013] Further, the step of calculating the calibrated induced voltage corresponding to each secondary coil group based on the induced voltages of all secondary coils includes:

[0014] Calculate the average value of the induced voltages of all secondary coils in each secondary coil group as the calibrated induced voltage corresponding to the secondary coil group.

[0015] Further, the step of calculating the optimal comparator threshold voltage and the optimal hysteresis voltage range for each secondary coil group based on the bulge peak voltage and the small wave valley voltage of the corresponding secondary coil includes:

[0016] For each secondary coil group:

[0017] Find the maximum values of the bulge peak voltage and the small wave valley voltage of the secondary coils corresponding to the secondary coil group as the maximum bulge peak voltage and the maximum small wave valley voltage;

[0018] Calculate the optimal comparator threshold voltage and the optimal hysteresis voltage range based on the maximum bulge peak voltage and the maximum small wave valley voltage.

[0019] Further, the step of calculating the optimal comparator threshold voltage and the optimal hysteresis voltage range based on the maximum bulge peak voltage and the maximum small wave valley voltage includes:

[0020] Determine the optimal comparator threshold voltage based on the maximum bulge peak voltage;

[0021] Determine the optimal hysteresis voltage range based on the maximum small wave valley voltage and the optimal comparator threshold voltage.

[0022] Further, the step of calculating the optimal comparator threshold voltage and the optimal hysteresis voltage range based on the maximum bulge peak voltage and the maximum small wave valley voltage includes:

[0023] Determine the optimal comparator threshold voltage according to the difference between the maximum bulge peak voltage and the maximum small wave valley voltage;

[0024] Determine the optimal hysteresis voltage range according to the maximum small wave valley voltage and the optimal comparator threshold voltage.

[0025] Further, the step of determining the optimal comparator threshold voltage according to the difference between the maximum bulge peak voltage and the maximum small wave valley voltage includes:

[0026] Judge whether the difference between the maximum bulge peak voltage and the maximum small wave valley voltage is less than a preset difference threshold:

[0027] When it is less than, then determine that the optimal comparator threshold voltage is:

[0028] V TH =(V2 + c) / d;

[0029] wherein, V TH is the optimal comparator threshold voltage, V2 is the maximum small wave valley voltage, c is a preset valley compensation amount, and d is a preset valley gain coefficient;

[0030] Otherwise, then determine that the optimal comparator threshold voltage is:

[0031] V TH =(V1 - a) / b;

[0032] wherein, V1 is the maximum bulge peak voltage, a is a preset peak offset amount, and b is a preset peak attenuation coefficient.

[0033] Further, the step of determining the optimal hysteresis voltage range according to the maximum small wave valley voltage and the optimal comparator threshold voltage includes:

[0034] Calculate the difference between the optimal comparator threshold voltage and the maximum small wave valley voltage;

[0035] Determine that the optimal hysteresis voltage range is less than the difference.

[0036] The second aspect of the present invention discloses a rod position measurement method, including:

[0037] Use the parameter tuning method of the rod position measurement system disclosed in any item of the first aspect of the present invention to set the threshold voltage and the hysteresis voltage range of the threshold comparators of all secondary coil groups;

[0038] Obtain the Gray code output by the threshold comparator corresponding to the secondary coil group of each control rod, and determine the rod position of the control rod according to the Gray code.

[0039] The third aspect of the present invention discloses a parameter calibration system for a rod position measurement system, including:

[0040] An adjustment module, configured to adjust the induced voltage of each secondary coil to a preset calibrated induced voltage according to the rod position detector and the secondary coil group; wherein, the calibrated induced voltages of the secondary coils in the same secondary coil group are the same;

[0041] An acquisition module, configured to acquire the peak voltage of the bulge and the valley voltage of the wavelet of each secondary coil of the corresponding rod position detector during the full-stroke movement of the control rod;

[0042] A calculation module, configured to calculate, for each secondary coil group, the optimal comparator threshold voltage and the optimal hysteresis voltage range according to the peak voltage of the bulge and the valley voltage of the wavelet of the corresponding secondary coil, as the threshold voltage and the hysteresis voltage range of the threshold comparator.

[0043] The fourth aspect of the present invention discloses a storage medium storing a computer program, characterized in that when the computer program is executed by a processor, the steps of any one of the parameter calibration methods of the rod position measurement system disclosed in the first aspect of the present invention are implemented.

[0044] The fifth aspect of the present invention discloses a rod position measurement system, including:

[0045] A plurality of rod position detectors, configured to collect the induced voltage of the secondary coil during the movement of the corresponding control rod and generate a Gray code through a threshold comparator;

[0046] An upper computer, configured to adjust the induced voltage of each secondary coil of each rod position detector to a preset calibrated induced voltage; and calculate the optimal comparator threshold voltage and the optimal hysteresis voltage range according to the peak voltage of the bulge and the valley voltage of the wavelet of each secondary coil of each rod position detector during the full-stroke movement of the corresponding control rod, as the threshold voltage and the hysteresis voltage range of the threshold comparator;

[0047] The upper computer is further configured to calculate the position of the corresponding control rod according to the Gray code generated by the rod position detector.

[0048] The present invention fully considers the differences in the physical characteristics of different secondary coils, applies calibration induction voltages matching the groups to them, and through the full-stroke control rod movement test, quickly obtains the characteristic voltages (bulge peak voltage and small wave valley voltage) of the secondary coils of the rod position detector, and accordingly calculates the optimal comparator threshold voltage and hysteresis voltage that precisely match the actual position of the control rod. Compared with the traditional method, the present invention adopts grouped calibration and characteristic voltage extraction, greatly reducing the number of attempts for blind parameter adjustment, shortening the static test duration, while ensuring the accuracy of the control rod position indication, significantly improving the calibration efficiency of the rod position measurement system, and saving the operation and maintenance costs of nuclear power units. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0050] Figure 1 is a schematic flow chart of a method for parameter calibration of a rod position measurement system disclosed in an embodiment of the present invention;

[0051] Figure 2 is a schematic diagram of a rod position detector coil disclosed in an embodiment of the present invention;

[0052] Figure 3 is a schematic diagram of the bulge peak voltage and small wave valley voltage of the induced voltage of the secondary coil disclosed in an embodiment of the present invention;

[0053] Figure 4 is a schematic flow chart of a rod position measurement method disclosed in an embodiment of the present invention;

[0054] Figure 5 is a schematic structural diagram of a parameter calibration system of a rod position measurement system disclosed in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0055] In order to enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0056] In the description, claims and above-mentioned drawings of the present invention, terms such as "first", "second", etc. are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, or product that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, apparatuses, or products.

[0057] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0058] Please refer to Figure 1 as shown Figure 1 is a schematic flow chart of a parameter calibration method for a rod position measurement system disclosed in an embodiment of the present invention. The rod position measurement system includes a plurality of rod position detectors corresponding to a plurality of control rods respectively. Each rod position detector includes a plurality of secondary coil groups and a threshold comparator corresponding to the secondary coil groups. The parameter calibration method may include the following operations:

[0059] S101. Adjust the induced voltage of each secondary coil to a preset calibration induced voltage respectively according to the rod position detector and the secondary coil group; wherein, the calibration induced voltages of the secondary coils in the same secondary coil group are the same;

[0060] In this optional embodiment, the rod position detector determines the actual rod position of the control rod connected to the drive rod in the reactor core by measuring the actual position of the drive rod. As Figure 2As shown in the figure, the rod position detector includes a primary coil, an auxiliary coil and a secondary coil. There is 1 primary coil, which runs through the entire stroke of the drive rod and is excited by an alternating current provided by the cabinet power supply module; there are 2 auxiliary coils, which are respectively located at both ends of the secondary coil. Their function is to generate a feedback voltage to stabilize the excitation current through the control loop; there are 31 secondary coils, which are divided into 5 secondary coil groups. Among them, Group A secondary coils, that is, the first secondary coil group, includes a total of 16 secondary coils numbered 1, 3, 5... 31. Group B secondary coils, that is, the second secondary coil group, includes a total of 8 secondary coils numbered 2, 6, 10... 30. Group C secondary coils, that is, the third secondary coil group, includes a total of 4 secondary coils numbered 4, 12, 20, 28. Group D secondary coils, that is, the fourth secondary coil group, includes a total of 2 secondary coils numbered 8, 24. Group E secondary coils, that is, the fifth secondary coil group, includes 1 secondary coil numbered 16.

[0061] Since the winding directions of two adjacent secondary coils in each secondary coil group are opposite, when the number of secondary coils of a certain secondary coil group through which the upper end of the magnetic drive rod passes is odd, the induced voltage output by the secondary coils of this group gradually increases to the highest value. When the induced voltage exceeds the set threshold, Gray code 1 is output; when the number of secondary coils of a certain secondary coil group through which the drive rod passes is even, the induced electromotive forces of the secondary coils of this group cancel each other out, and the induced voltage gradually drops to the lowest, below the set threshold, thus outputting Gray code 0.

[0062] Using this principle, by measuring the induced voltages of different groups of secondary coils distributed along the stroke of the drive rod, the position of the drive rod can be monitored, and thus the actual rod position of the control rod can be obtained.

[0063] In an optional embodiment, the preset method for calibrating the induced voltage includes:

[0064] Obtain the induced voltages of all secondary coils when all control rods are at the specified rod positions;

[0065] Calculate the calibrated induced voltage corresponding to each secondary coil group according to the induced voltages of all secondary coils.

[0066] In this optional embodiment, an alternating current is passed through the primary coil to generate an alternating magnetic field. When the magnetic drive rod is inserted into the secondary coil, the magnetic flux in the secondary coil changes, and an induced electromotive force will be generated in the secondary coil, outputting an induced voltage. In order to obtain the induced voltage, a voltage sampling circuit can be connected in parallel at both ends of each secondary coil, and the collected induced voltage signal is input into the data acquisition module for processing. By real-time collecting and analyzing the induced voltage of the secondary coil, the position of the drive rod can be judged, and then the actual rod position of the control rod can be determined.

[0067] It can be seen that in this alternative embodiment, by obtaining the induced voltage data of the secondary coil under standard conditions and performing overall calibration on each coil group, systematic errors can be effectively eliminated, the measurement accuracy can be improved, the threshold judgment logic can be optimized, providing a strong guarantee for the precise calibration of the rod position measurement system, and being of great significance for improving the reliability of control rod position monitoring.

[0068] In another alternative embodiment, the steps of obtaining the induced voltages of all secondary coils when all control rods are at a specified rod position include:

[0069] Adjust the voltage divider regulator parameters of the signal circuits of all rod position detectors to be the same;

[0070] Obtain the induced voltages of all secondary coils when all control rods are at a specified rod position.

[0071] It can be seen that in this embodiment, by adjusting the voltage divider regulator parameters of the signal circuits of all rod position detectors to be the same before obtaining the induced voltage under standard conditions, the systematic errors introduced due to circuit parameter differences can be effectively eliminated. In practical applications, due to factors such as the installation position of the rod position detectors, the cable length, and the component characteristics, there may be certain differences in the output gain and impedance characteristics of the signal circuits of each detector. If the original induced voltage data is directly used for calibration, measurement deviations may occur due to inconsistent circuit gains. By pre-adjusting the voltage divider parameters, the signal circuits of all detectors have the same output response to the same induced voltage input, and the influence brought by such circuit differences can be eliminated from the source. The standard state data obtained in this way can truly reflect the induced characteristics of the secondary coil itself and will not be masked by the differences in circuit parameters. Based on this "normalized" data for calculating the calibrated induced voltage, the results obtained are more accurate and reliable and can better reflect the actual output state of the secondary coil.

[0072] In another alternative embodiment, the specified rod position refers to the rod position at which the Gray codes output by all threshold comparators are all the first logical value.

[0073] In this alternative embodiment, the first logical value refers to the logical value 1.

[0074] In yet another alternative embodiment, the steps of calculating the calibrated induced voltage corresponding to each secondary coil group according to the induced voltages of all secondary coils include:

[0075] Calculate the mean value of the induced voltages of all secondary coils in each secondary coil group as the calibrated induced voltage corresponding to this secondary coil group.

[0076] It can be seen that this optional embodiment makes full use of the regularity and symmetry of the coil arrangement within the secondary coil group. Since the secondary coils within the same coil group are the same or symmetrical in terms of spatial position, winding parameters, etc., their induced voltages under standard conditions should theoretically be the same. Through mean value calculation, data deviation caused by factors such as individual coil manufacturing errors and local magnetic field disturbances can be suppressed, and a more stable and reliable calibration value can be obtained. At the same time, the mean value calculation process is simple and intuitive, easy to implement in engineering, does not require complex mathematical models and iterative calculations, and greatly improves the calibration efficiency. The induced voltage obtained by using this calibration method can better reflect the overall output characteristics of the secondary coil group, providing a more accurate and reliable threshold basis for subsequent rod position judgment.

[0077] S102. Obtain the peak voltage of the bulge and the valley voltage of the small wave of each secondary coil of the corresponding rod position detector during the full-stroke movement of the control rod.

[0078] In this optional embodiment, the full-stroke movement refers to the process of the control rod moving from the fully inserted position to the fully withdrawn position, or from the fully withdrawn position to the fully inserted position, that is, the movement of the control rod within the entire range where it can move in the reactor core. The peak voltage of the bulge refers to when the drive rod of the control rod is inserted into the secondary coil, due to the change of the magnetic flux in the coil, the induced voltage of the secondary coil will appear a relatively large pulse peak, and this peak voltage is called the peak voltage of the bulge. The valley voltage of the small wave refers to when the drive rod of the control rod is withdrawn from the secondary coil, the induced voltage of the secondary coil will appear a relatively small pulse valley, and this valley voltage is called the valley voltage of the small wave. The magnitudes of the peak voltage of the bulge and the valley voltage of the small wave are related to the insertion depth and speed of the drive rod in the coil, and can be used to reflect the position change of the control rod. Figure 3 Shows a plurality of peak voltages of the bulge and valley voltages of the small wave. The maximum peak V1 of the bulge is the maximum value among the plurality of peak voltages of the bulge, and the maximum value of the valley of the small wave is the maximum value among the plurality of valley voltages of the small wave.

[0079] S103. For each secondary coil group, calculate the optimal comparator threshold voltage and the optimal hysteresis voltage range according to the peak voltage of the bulge and the valley voltage of the small wave of its corresponding secondary coil, and use them as the threshold voltage and the hysteresis voltage range of this threshold comparator.

[0080] In an optional embodiment, the steps of calculating the optimal comparator threshold voltage and the optimal hysteresis voltage range according to the peak voltage of the bulge and the valley voltage of the small wave of its corresponding secondary coil for each secondary coil group include:

[0081] For each secondary coil group:

[0082] Find the maximum values of the bulge peak voltage and the small wave valley voltage of the secondary coil corresponding to the secondary coil group as the maximum bulge peak voltage and the maximum small wave valley voltage;

[0083] Calculate the optimal comparator threshold voltage and the optimal hysteresis voltage range according to the maximum bulge peak voltage and the maximum small wave valley voltage.

[0084] It can be seen that in this alternative embodiment, by extracting the maximum values of the bulge peak voltage and the small wave valley voltage of all secondary coils within each secondary coil group, it is possible to comprehensively cover the extreme signal fluctuations that may occur during the full stroke movement of the control rod for this group of secondary coils. Calculating the comparator threshold and the hysteresis voltage range based on the maximum bulge peak voltage and the maximum small wave valley voltage can ensure that the upper limit boundary of the signal amplitudes of the secondary coils within the group is fully considered when designing the comparator parameters, avoiding low threshold settings or narrow hysteresis ranges caused by insufficient signal amplitudes of local coils, thereby ensuring that all secondary coils within the group can reliably trigger logic state transitions under dynamic conditions and enhancing the overall anti-interference ability and robustness of the system.

[0085] In another alternative embodiment, the steps of calculating the optimal comparator threshold voltage and the optimal hysteresis voltage range according to the maximum bulge peak voltage and the maximum small wave valley voltage include:

[0086] Determine the optimal comparator threshold voltage according to the maximum bulge peak voltage;

[0087] Determine the optimal hysteresis voltage range according to the maximum small wave valley voltage and the optimal comparator threshold voltage.

[0088] It can be seen that in this alternative embodiment, by calculating the optimal comparator threshold voltage and the optimal hysteresis voltage range in stages, first using the maximum bulge peak voltage to determine the optimal comparator threshold voltage to ensure that the threshold setting is higher than the maximum interference signal amplitude that may appear in all secondary coils and avoid mis-triggering; then combining the maximum small wave valley voltage to determine the hysteresis voltage range so that the threshold hysteresis can cover the minimum fluctuation amplitude of the signal falling edge. This hierarchical design method not only ensures the global adaptability of the threshold setting but also precisely suppresses the state jitter caused by signal oscillation by dynamically adjusting the hysteresis range, thus achieving the dual optimization of the stability and anti-noise performance of signal discrimination.

[0089] In yet another alternative embodiment, the steps of calculating the optimal comparator threshold voltage and the optimal hysteresis voltage range according to the maximum bulge peak voltage and the maximum small wave valley voltage include:

[0090] Determine the optimal comparator threshold voltage according to the difference between the maximum bulge peak voltage and the maximum small wave valley voltage;

[0091] Determine the optimal hysteresis voltage range according to the maximum wave trough voltage and the optimal comparator threshold voltage.

[0092] It can be seen that in this alternative embodiment, by introducing the difference between the maximum bulge peak voltage and the maximum wave trough voltage as the basis for threshold calculation, the signal dynamic range is quantified into operable parameters. The difference calculation can effectively characterize the overall intensity difference of signal fluctuations within the secondary coil group. The threshold determined based on the difference can adapt to the change of signal strength. At the same time, the hysteresis range is constrained by the maximum wave trough voltage, so that the hysteresis voltage forms a positive correlation with the minimum amplitude of the signal falling edge. This dual constraint mechanism not only prevents the decrease of signal sensitivity caused by too high threshold setting, but also avoids the risk of false triggering caused by insufficient hysteresis range, and significantly improves the dynamic response accuracy of the measurement system.

[0093] In another alternative embodiment, the step of determining the optimal comparator threshold voltage according to the difference between the maximum bulge peak voltage and the maximum wave trough voltage includes:

[0094] Judge whether the difference between the maximum bulge peak voltage and the maximum wave trough voltage is less than a preset difference threshold:

[0095] When it is less than, then determine that the optimal comparator threshold voltage is:

[0096] V TH =(V2 + c) / d;

[0097] where, V TH is the optimal comparator threshold voltage, V2 is the maximum wave trough voltage, c is a preset trough compensation amount, and d is a preset trough gain coefficient;

[0098] Otherwise, then determine that the optimal comparator threshold voltage is:

[0099] V TH =(V1 - a) / b;

[0100] where, V1 is the maximum bulge peak voltage, a is a preset peak offset amount, and b is a preset peak attenuation coefficient.

[0101] In this alternative embodiment, a is a correction value deducted from the peak value of the induced voltage, which is used to suppress signal overshoot interference; b is a proportional scaling factor for the corrected peak voltage, which is used to adapt to the input range of the comparator; c is a reference correction value superimposed on the trough value of the induced voltage, which is used to improve the stability of low-level signals; d is an amplification factor for the compensated trough voltage, which is used to enhance the effectiveness of weak signals.

[0102] In yet another alternative embodiment, the step of determining the optimal hysteresis voltage range according to the maximum minor wave valley voltage and the optimal comparator threshold voltage includes:

[0103] Calculating the difference between the optimal comparator threshold voltage and the maximum minor wave valley voltage;

[0104] Determining that the optimal hysteresis voltage range is less than the difference value.

[0105] It can be seen that in this alternative embodiment, by limiting the optimal hysteresis voltage range to be less than the difference between the optimal comparator threshold voltage and the maximum minor wave valley voltage, it is mathematically ensured that the hysteresis width is always within the physical constraint range of the actual fluctuation amplitude of the signal falling edge. This constraint relationship effectively balances the contradiction between the anti-noise requirement and the response speed: on one hand, by setting sufficient hysteresis to eliminate the misoperation caused by signal bounce, and on the other hand, avoiding the state switching lag caused by excessive hysteresis, thereby improving the signal discrimination stability while maintaining the real-time performance of the system.

[0106] Please refer to Figure 4 as shown in Figure 4 which is a schematic flowchart of a rod position measurement method disclosed in an embodiment of the present invention, including:

[0107] S401. Set the threshold voltage and the hysteresis voltage range of the threshold comparator for all secondary coil groups by using the parameter calibration method of the rod position measurement system as described in the foregoing embodiment;

[0108] S402. Obtain the Gray code output by the threshold comparator corresponding to each secondary coil group of the control rod, and determine the rod position of the control rod according to the Gray code.

[0109] Taking the Figure 2 rod position detector shown in

[0110] as an example, the correspondence between the Gray codes of each secondary coil group and the measured rod position is shown in Table 1:

[0111]

[0112]

[0113] In Table 1, A, B, C, D, and E respectively correspond to the first, second, third, fourth, and fifth secondary coil groups. The numbers in each list table under the Gray code are the first logical value 1 and the second logical value 0. As shown in Table 1, when the Gray codes of all secondary coil groups are the first logical value, the rod position corresponds to 160.

[0114] Please refer to Figure 5 as shown in Figure 5A parameter calibration system for a rod position measurement system disclosed in an embodiment of the present invention includes:

[0115] An adjustment module 501 for adjusting the induced voltage of each secondary coil to a preset calibrated induced voltage according to the rod position detector and the secondary coil group respectively; wherein, the calibrated induced voltages of the secondary coils in the same secondary coil group are the same;

[0116] An acquisition module 502 for acquiring the bulge peak voltage and the small wave valley voltage of each secondary coil of the corresponding rod position detector during the full stroke movement of the control rod;

[0117] A calculation module 503 for calculating the optimal comparator threshold voltage and the optimal hysteresis voltage range for each secondary coil group according to the bulge peak voltage and the small wave valley voltage of the corresponding secondary coil, as the threshold voltage and the hysteresis voltage range of the threshold comparator.

[0118] For the specific limitations of the parameter calibration system of the rod position measurement system, reference can be made to the limitations of the parameter calibration method of the rod position measurement system in the above text, which will not be elaborated here. Each module in the above parameter calibration system of the rod position measurement system can be implemented in whole or in part by software, hardware and their combination. The above modules can be embedded in the processor of the electronic device in a hardware format or independent of it, or stored in the memory of the electronic device in a software format, so as to facilitate the processor to call the corresponding operations of the above modules.

[0119] It should be noted that, in order to highlight the innovative part of the present invention, modules not closely related to solving the technical problems proposed by the present invention are not introduced in this embodiment, but this does not mean that there are no other modules in this embodiment.

[0120] An embodiment of the present invention also discloses a rod position measurement system, including:

[0121] A plurality of rod position detectors for collecting the induced voltage of the secondary coil during the movement of the corresponding control rod and generating a Gray code through a threshold comparator;

[0122] A host computer for adjusting the induced voltage of each secondary coil of each rod position detector to a preset calibrated induced voltage; and calculating the optimal comparator threshold voltage and the optimal hysteresis voltage range according to the bulge peak voltage and the small wave valley voltage of each secondary coil of each rod position detector during the full stroke movement of the corresponding control rod, as the threshold voltage and the hysteresis voltage range of the threshold comparator;

[0123] The host computer is further configured to calculate the position of the corresponding control rod according to the Gray code generated by the rod position detector.

[0124] It should be noted that, in order to highlight the innovative part of the present invention, modules that are not closely related to solving the technical problems proposed by the present invention are not introduced in this embodiment. However, this does not mean that there are no other modules in this embodiment.

[0125] The above-mentioned integrated units implemented in the form of software function modules can be stored in a computer-readable storage medium, and the storage medium can be non-volatile or volatile. The above-mentioned software function modules are stored in a storage medium and include several instructions to enable a computer device (which can be a personal computer, a computer device, or a network device, etc.) or a processor to execute part of the functions of the management method of the in-vehicle application described in various embodiments of the present application.

[0126] In summary, a rod position measurement and its parameter calibration method, system and medium disclosed by the present invention fully consider the physical property differences of different secondary coils, apply calibration induction voltages matching the groups to them, and through the full-stroke control rod movement test, quickly obtain the characteristic voltages (bulge peak voltage and small wave valley voltage) of the secondary coils of the rod position detector, and calculate the optimal comparator threshold voltage and hysteresis voltage that accurately match the actual position of the control rod accordingly. Compared with the traditional method, the present invention adopts grouped calibration and characteristic voltage extraction, greatly reducing the number of attempts for blind parameter adjustment and shortening the static test duration. While ensuring the accuracy of the control rod position indication, it significantly improves the calibration efficiency of the rod position measurement system and saves the operation and maintenance costs of nuclear power units. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0127] The above embodiments only exemplarily illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A method for parameter calibration of a rod position measurement system, characterized in that, The rod position measurement system includes a plurality of rod position detectors respectively corresponding to a plurality of control rods. Each rod position detector includes a plurality of secondary coil groups and a threshold comparator corresponding to the secondary coil group. The parameter calibration method includes: Adjust the induced voltage of each secondary coil to a preset calibrated induced voltage respectively according to the rod position detector and the secondary coil group. Among them, the calibrated induced voltages of the secondary coils in the same secondary coil group are the same. Obtain the bulge peak voltage and the small wave valley voltage of each secondary coil of the corresponding rod position detector during the full stroke movement of the control rod. For each secondary coil group, calculate the optimal comparator threshold voltage and the optimal hysteresis voltage range according to the bulge peak voltage and the small wave valley voltage of the corresponding secondary coils, and use them as the threshold voltage and the hysteresis voltage range of the threshold comparator.

2. The parameter calibration method of a rod position measurement system according to claim 1, characterized in that, The preset method of the calibrated induced voltage includes: Obtain the induced voltages of all secondary coils when all control rods are at a specified rod position. Calculate the calibrated induced voltage corresponding to each secondary coil group according to the induced voltages of all secondary coils.

3. The parameter calibration method of a rod position measurement system according to claim 2, characterized in that The specified rod position refers to the rod position where the Gray codes output by all threshold comparators are all the first logical value.

4. A parameter calibration method for a rod position measurement system according to claim 2, characterized in that, The step of calculating the calibrated induced voltage corresponding to each secondary coil group according to the induced voltages of all secondary coils includes: Calculate the mean value of the induced voltages of all secondary coils in each secondary coil group as the calibrated induced voltage corresponding to the secondary coil group.

5. A parameter calibration method for a rod position measurement system according to claim 1, characterized in that, The step of calculating the optimal comparator threshold voltage and the optimal hysteresis voltage range for each secondary coil group according to the bulge peak voltage and the small wave valley voltage of the corresponding secondary coils includes: For each secondary coil group: Find the maximum values of the bulge peak voltage and the small wave valley voltage of the secondary coils corresponding to the secondary coil group as the maximum bulge peak voltage and the maximum small wave valley voltage. Calculate the optimal comparator threshold voltage and the optimal hysteresis voltage range according to the maximum bulge peak voltage and the maximum small wave valley voltage.

6. A parameter calibration method for a rod position measurement system according to claim 5, characterized in that, The step of calculating the optimal comparator threshold voltage and the optimal hysteresis voltage range according to the maximum bulge peak voltage and the maximum small wave valley voltage includes: Determine the optimal comparator threshold voltage according to the maximum bulge peak voltage. Determine the optimal hysteresis voltage range according to the maximum small wave valley voltage and the optimal comparator threshold voltage.

7. A parameter calibration method for a rod position measurement system according to claim 6, characterized in that, The step of calculating the optimal comparator threshold voltage and the optimal hysteresis voltage range according to the maximum bulge peak voltage and the maximum small wave valley voltage includes: Determine the optimal comparator threshold voltage according to the difference between the maximum bulge peak voltage and the maximum small wave valley voltage. Determine the optimal hysteresis voltage range according to the maximum small wave valley voltage and the optimal comparator threshold voltage.

8. A parameter calibration method for a rod position measurement system according to claim 7, characterized in that, The step of determining the optimal comparator threshold voltage according to the difference between the maximum bulge peak voltage and the maximum small wave valley voltage includes: Judge whether the difference between the maximum bulge peak voltage and the maximum small wave valley voltage is less than a preset difference threshold: When it is less, then determine that the optimal comparator threshold voltage is: V TH = (V2 + c) / d; Among them, V TH is the optimal comparator threshold voltage, V2 is the maximum wavelet valley voltage, c is a preset valley compensation amount, and d is a preset valley gain coefficient; Otherwise, then determine that the optimal comparator threshold voltage is: V TH = (V1 - a) / b; Wherein, V1 is the maximum bulge peak voltage, a is a preset peak offset, and b is a preset peak attenuation coefficient.

9. A parameter calibration method for a rod position measurement system according to claim 6 or 7, characterized in that The steps of determining the optimal hysteresis voltage range according to the maximum minor wave valley voltage and the optimal comparator threshold voltage include: Calculating the difference between the optimal comparator threshold voltage and the maximum minor wave valley voltage; Determining that the optimal hysteresis voltage range is less than the difference.

10. A method for measuring the position of a rod, characterized in that, Including: Setting the threshold voltage and the hysteresis voltage range of the threshold comparator for all secondary coil groups by using the parameter calibration method of the rod position measurement system according to any one of claims 1-9; Obtaining the Gray code output by the threshold comparator corresponding to the secondary coil group of each control rod, and determining the rod position of the control rod according to the Gray code.

11. A parameter calibration system for a rod position measurement system, characterized in that, Including: An adjustment module, configured to adjust the induced voltage of each secondary coil to a preset calibrated induced voltage respectively according to the rod position detector and the secondary coil group; wherein, the calibrated induced voltages of the secondary coils in the same secondary coil group are the same; An acquisition module, configured to acquire the bulge peak voltage and the minor wave valley voltage of each secondary coil of the corresponding rod position detector during the full stroke movement of the control rod; A calculation module, configured to calculate, for each secondary coil group, the optimal comparator threshold voltage and the optimal hysteresis voltage range according to the bulge peak voltage and the minor wave valley voltage of the corresponding secondary coil, and use them as the threshold voltage and the hysteresis voltage range of the threshold comparator.

12. A storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the parameter calibration method of the rod position measurement system according to any one of claims 1 to 9.

13. A rod position measurement system, characterized in that: Including: A plurality of rod position detectors, configured to collect the induced voltage of the secondary coil during the movement of the corresponding control rod and generate a Gray code through a threshold comparator; An upper computer, configured to adjust the induced voltage of each secondary coil of each rod position detector to a preset calibrated induced voltage; and calculate the optimal comparator threshold voltage and the optimal hysteresis voltage range according to the bulge peak voltage and the minor wave valley voltage of each secondary coil of each rod position detector during the full stroke movement of the corresponding control rod, and use them as the threshold voltage and the hysteresis voltage range of the threshold comparator; The upper computer is further configured to calculate the position of the corresponding control rod according to the Gray code generated by the rod position detector.

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