Multi-disciplinary Simulation Adjustment System and Method for Control Rod Drive Mechanism

Abstract

The present invention provides a multidisciplinary simulation and adjustment system and method for a control rod drive mechanism, which relates to the field of reactor system control. Among them, in the above system, the data acquisition module is used to obtain the first motion state and the first drive current signal of the control rod at the previous sampling moment for any sampling period, so as to be used as the target motion state and the target current signal. The data processing module then determines the second motion state of the control rod at the current sampling moment based on the target motion state and the target current signal. And it determines the fault state of the control rod drive mechanism according to the second motion state, and correspondingly adjusts the value of the target current signal according to the type of the fault state as the new target current signal, and uses the second motion state as the new target motion state to iteratively calculate the motion state of the next sampling moment until the cut-off moment of the current sampling period is reached. The present invention can improve the accuracy of the control rod drive mechanism in controlling the start-up and shutdown of the reactor and the adjustment of the reaction power.

Description

Technical Field

[0001] The present invention relates to the field of control of pressurized water reactor systems, and more particularly, to a multidisciplinary simulation adjustment system and method for a control rod drive mechanism. Background Art

[0002] The control rod drive mechanism is an important part of the control and safety protection of pressurized water reactor systems, and can drive the control rod to perform lifting, lowering, holding or fast insertion actions to control the start-up and shutdown of the reactor and adjust the reaction power.

[0003] However, the operation process of the control rod drive mechanism is often affected by multi-action loads such as electromagnetic force and fluid resistance. And with the continuous change of the time-sequence current, when the control rod drive mechanism lifts the armature, the electromagnetic force received will gradually increase and even be greater than the resistance, causing the control rod to gradually accelerate from rest, and the corresponding fluid resistance will also increase, and even a large impact force will be generated. In the prior art, the multi-disciplinary loads received during the movement process of the drive mechanism are coupled and interact with each other, and there will be problems of unequal parameter states and inconsistent dimensions during the execution of multi-disciplinary related sampling processes. And for traditional single-disciplinary sampling analysis methods, the sampling methods among the single-disciplinary sampling analysis methods are independent of each other, and it is impossible to achieve precise adjustment of the movement of the multi-disciplinary system, resulting in the control rod drive mechanism being unable to accurately control the start-up and shutdown of the reactor, and thus unable to ensure precise adjustment of the reaction power.

[0004] Based on this, there is an urgent need for an adjustment scheme based on the control rod drive mechanism, which can improve the accuracy of controlling the start-up and shutdown of the reactor and adjusting the reaction power by the control rod drive mechanism. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an adjustment scheme based on the control rod drive mechanism, which can achieve precise calculation and adjustment of the movement of the multi-disciplinary system, and further improve the accuracy of controlling the start-up and shutdown of the reactor and adjusting the reaction power by the control rod drive mechanism.

[0006] To achieve the above purpose, the technical solution adopted in the embodiment of the present invention is as follows:

[0007] In the first aspect, the present invention provides a multidisciplinary simulation adjustment system for a control rod drive mechanism, including: a data acquisition module and a data processing module connected in sequence;

[0008] The data acquisition module is used to obtain the first motion state and the first drive current signal of the control rod at the previous sampling moment for any sampling period, and use the first motion state as the target motion state; use the first drive current signal as the target current signal; wherein, the sampling period includes multiple sampling moments;

[0009] A data processing module, configured to determine the second motion state of the control rod at the current sampling moment according to the target motion state and the target current signal; wherein, the time interval between the current sampling moment and the previous sampling moment is determined by the infinitesimal method;

[0010] The data processing module is further configured to determine the fault state type of the control rod drive mechanism according to the motion parameters in the second motion state, and correspondingly adjust the value of the target current signal according to the fault state type, update the target current signal, update the target motion state with the second motion state, and return to execute the step of determining the second motion state of the control rod at the current sampling moment according to the target motion state and the target current signal, until the cut-off moment of the current sampling period is reached, so as to obtain the motion state of the control rod in the current sampling period.

[0011] Optionally, the data processing module includes an electromagnetic calculation unit, a fluid calculation unit, and a dynamics calculation unit. The output end of the electromagnetic calculation unit is connected to the input ends of the fluid calculation unit and the dynamics calculation unit, and the output end of the fluid calculation unit is also connected to the input end of the dynamics calculation unit;

[0012] The electromagnetic calculation unit is configured to determine the electromagnetic force of the control rod at the current sampling moment according to the drive current signal and the target motion state at the previous sampling moment;

[0013] The fluid calculation unit is configured to determine the fluid resistance of the control rod at the current sampling moment according to the target motion state;

[0014] The dynamics calculation unit is configured to determine the second motion state of the control rod at the current sampling moment according to the fluid resistance, the electromagnetic force, and the target motion state, wherein the second motion state includes a second displacement, a second velocity, and a second acceleration.

[0015] Optionally, when the target motion state includes a first velocity, a first displacement, and a first acceleration, the electromagnetic calculation unit is configured to determine the electromagnetic force of the control rod at the current sampling moment according to the drive current signal, the first displacement, and the first velocity at the previous sampling moment;

[0016] The fluid calculation unit is configured to determine the fluid resistance of the control rod at the current sampling moment according to the first displacement, the first velocity, and the first acceleration;

[0017] The dynamics calculation unit is configured to determine the second motion state of the control rod at the current sampling moment according to the fluid resistance, the electromagnetic force, the first displacement, the first velocity, and the first acceleration.

[0018] Optionally, the data processing module further includes a judgment unit, and the input end of the judgment unit is connected to the output end of the dynamics calculation unit;

[0019] A judgment unit is used to judge whether the value of the second displacement is equal to a first preset threshold. If it is equal, then judge whether the value of the second speed is greater than a second preset threshold. If it is greater, it is determined that the moving rod impacts overload at the current sampling moment, and the value of the first drive current signal is reduced to update the target current signal. If it is less, then judge whether the value corresponding to the current sampling moment is greater than a third preset threshold. If it is greater, it is determined that the lifting time of the moving rod exceeds the limit at the current sampling moment, and the value of the drive current signal is increased to update the target current signal.

[0020] Optionally, the judgment unit is further configured to, when the value of the second displacement is not equal to the first preset threshold, judge whether the value of the second speed is equal to a fourth preset threshold, and at the same time whether the value corresponding to the current sampling moment is greater than a fifth preset threshold. If the above conditions are met, it is determined that the moving rod is locked at the current sampling moment, and the value of the drive current signal is increased to update the target current signal. If the above conditions are not met, then judge whether the value of the second speed is less than the fourth preset threshold. If so, it is determined that the moving rod slips at the current sampling moment, and the value of the drive current signal is increased to update the target current signal.

[0021] Wherein, the fourth preset threshold is less than the second preset threshold.

[0022] Optionally, the calculation equation of the dynamics calculation unit is expressed as:

[0023]

[0024] F(t + Δt) = F e (t + Δt) - F f (t + Δt) - G - F d (t + Δt)

[0025] Wherein, U(t + Δt), and are respectively the displacement, speed and acceleration at the current sampling moment t + Δt; F(t + Δt) is the load vector of the control rod drive system at the current sampling moment t + Δt; [M], [C] and [K] are respectively the mass matrix, damping matrix and stiffness matrix of the control rod drive system; F f (t + Δt) is the fluid resistance of the control rod at the current sampling moment t + Δt; G is the gravity of the control rod; F d (t + Δt) is the spring force of the control rod at the current sampling moment t + Δt; F e (t + Δt) is the electromagnetic force of the control rod at the current sampling moment t + Δt.

[0026] Optionally, the steps for determining the time interval between the current sampling moment and the previous sampling moment by the infinitesimal element method include:

[0027] Taking the single-step movement process of the control rod drive mechanism as the sampling period, and based on the micro-element method, the sampling period is divided into multiple time micro-elements with the same time interval to obtain the time interval between the current sampling moment and the previous sampling moment;

[0028] Among them, the expression of the time micro-element satisfies:

[0029] U = T / Δt;

[0030] In the formula, U is the total number of time micro-elements; T is the sampling period; Δt is the value of the time micro-element.

[0031] In a second aspect, the present invention provides a multi-disciplinary simulation adjustment method for a control rod drive mechanism. The multi-disciplinary simulation adjustment method for a control rod drive mechanism includes the following steps:

[0032] For any sampling period, obtain the first motion state and the first drive current signal of the control rod at the previous sampling moment; and take the first motion state as the target motion state and the first drive current signal as the target current signal; wherein, the sampling period includes multiple sampling moments;

[0033] According to the target motion state and the target current signal, determine the second motion state of the control rod at the current sampling moment; wherein, the time interval between the current sampling moment and the previous sampling moment is determined by the micro-element method;

[0034] According to the motion parameters in the second motion state, determine the type of the fault state of the control rod drive mechanism, and correspondingly adjust the value of the target current signal according to the type of the fault state, update the target current signal, update the target motion state with the second motion state, and return to execute the step of determining the second motion state of the control rod at the current sampling moment according to the target motion state and the target current signal until the cut-off moment of the current sampling period is reached, and obtain the motion state of the control rod in the current sampling period.

[0035] Preferably, when the target motion state includes the first speed, the first displacement, and the first acceleration, the step of determining the second motion state of the control rod at the current sampling moment according to the target motion state and the target current signal includes:

[0036] Determine the electromagnetic force of the control rod at the current sampling moment according to the drive current signal, the first displacement, and the first speed at the previous sampling moment;

[0037] Determine the fluid resistance of the control rod at the current sampling moment according to the first displacement, the first speed, and the first acceleration;

[0038] Determine the second motion state of the control rod at the current sampling moment according to the fluid resistance, the electromagnetic force, the first displacement, the first speed, and the first acceleration.

[0039] Optionally, the steps for determining the time interval between the current sampling moment and the previous sampling moment by the infinitesimal method include:

[0040] Taking the movement process of a single step of the control rod drive mechanism as the sampling period, dividing the sampling period into multiple time infinitesimals with the same time interval based on the infinitesimal method, to obtain the time interval between the current sampling moment and the previous sampling moment;

[0041] Wherein, the expression of the time infinitesimal satisfies:

[0042] U = T / Δt;

[0043] In the formula, U is the total number of time infinitesimals; T is the sampling period; Δt is the value of the time infinitesimal.

[0044] A multi-disciplinary simulation adjustment system and method for a control rod drive mechanism provided by an embodiment of the present invention have the following beneficial effects:

[0045] In the multi-disciplinary simulation adjustment system for the control rod drive mechanism of the present invention, it includes a data acquisition module and a data processing module connected in sequence. The data acquisition module is used to obtain the first movement state of the control rod and the first drive current signal at the previous sampling moment for any sampling period, and take the first movement state as the target movement state; take the first drive current signal as the target current signal. The data processing module is used to determine the second movement state of the control rod at the current sampling moment based on the target movement state and the target current signal. The data processing module is also used to determine the fault state of the control rod drive mechanism according to the movement parameters in the second movement state, and when a fault occurs, adjust the value of the target current signal corresponding to the type of the fault state to obtain a new target current signal, and take the second movement state as the new target movement state, and return to execute the step of determining the second movement state of the control rod at the current sampling moment based on the target movement state and the target current signal until reaching the cut-off moment of the current sampling period, to obtain the movement state of the control rod in the current sampling period. The present invention can achieve accurate calculation and adjustment of the movement of a multi-disciplinary system, and further improve the accuracy of the control rod drive mechanism in controlling the start-up and shutdown of the reactor and adjusting the reaction power.

[0046] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given below, and in conjunction with the accompanying drawings, the detailed description is as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 Shows the structural schematic diagram of the multidisciplinary simulation adjustment system of the control rod drive mechanism in the embodiment of the present invention;

[0049] Figure 2 Shows one of the structural schematic diagrams of the data processing module in the embodiment of the present invention;

[0050] Figure 3 Shows the data processing schematic diagram between the data processing module and the data acquisition module in the embodiment of the present invention;

[0051] Figure 4 Shows another structural schematic diagram of the data processing module in the embodiment of the present invention;

[0052] Figure 5 Shows the process schematic diagram of the data processing module in the embodiment of the present invention;

[0053] Figure 6 Shows the step flowchart of the multidisciplinary simulation adjustment method of the control rod drive mechanism in the embodiment of the present invention;

[0054] Figure 7 Shows the sub-step flowchart of S2 in the embodiment of the present invention.

[0055] Icons: 100 - Multidisciplinary simulation adjustment system of control rod drive mechanism; 101 - Data acquisition module; 102 - Data processing module; 201 - Electromagnetic calculation unit; 202 - Fluid calculation unit; 203 - Dynamics calculation unit; 204 - Judgment unit. Detailed implementation manners

[0056] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0057] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0058] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0059] As described in the background art, in the prior art, the multidisciplinary loads suffered by the driving mechanism during the movement process are coupled and interact with each other, and there will be problems of unequal parameter states and inconsistent dimensions during the execution of multidisciplinary related sampling processes. Moreover, for traditional single-discipline sampling analysis methods, the sampling methods among the single-discipline sampling analysis methods are independent of each other, and it is impossible to accurately adjust the movement of the multidisciplinary system, resulting in the control rod drive mechanism being unable to accurately control the start and stop of the reactor, and thus unable to ensure the accurate adjustment of the reaction power.

[0060] Based on this, the present invention provides an adjustment scheme based on the control rod drive mechanism to improve the accuracy of controlling the start and stop of the reactor and adjusting the reaction power by the control rod drive mechanism.

[0061] The above adjustment scheme will be described in detail below.

[0062] First Embodiment

[0063] Please refer to Figure 1 , Figure 1 , which shows a schematic structural diagram of a multidisciplinary simulation adjustment system for a control rod drive mechanism. In the present invention, the multidisciplinary simulation adjustment system 100 for a control rod drive mechanism includes a data acquisition module 101 and a data processing module 102 connected in sequence.

[0064] Among them, the data acquisition module 101 is used to obtain the first motion state of the control rod and the first drive current signal at the previous sampling moment for any sampling period, and use the first motion state as the target motion state; use the first drive current signal as the target current signal; wherein, the sampling period includes a plurality of sampling moments.

[0065] The data processing module 102 is used to determine the second motion state of the control rod at the current sampling moment according to the target motion state and the target current signal; wherein, the time interval between the current sampling moment and the previous sampling moment is determined by the microelement method.

[0066] The data processing module 102 is further configured to determine the fault state type of the control rod drive mechanism according to the motion parameters in the second motion state, and correspondingly adjust the value of the target current signal according to the fault state type, update the target current signal, update the target motion state with the second motion state, and return to execute the step of determining the second motion state of the control rod at the current sampling moment according to the target motion state and the target current signal, until reaching the cut-off moment of the current sampling period, so as to obtain the motion state of the control rod in the current sampling period.

[0067] Based on this, in this embodiment, the data acquisition module is used to obtain the first motion state and the first drive current signal corresponding to the moving rod at the previous sampling moment, and then the data processing module is used to determine the second motion state and the second drive current signal corresponding to the moving rod at the current sampling moment according to the first motion state and the first drive current signal. Subsequently, the data processing module will also determine whether there is a fault in the control rod drive mechanism according to the second motion state and the second drive current signal. If there is a fault, the value of the target current signal will be adjusted according to the determined fault state type as the updated target current signal, and the second motion state obtained by the above calculation will be used as the updated target motion state, and then the motion state and the drive current signal corresponding to the next sampling moment will be calculated iteratively until reaching the cut-off moment of the current sampling period, so as to obtain the motion state of the control rod in the current sampling period.

[0068] Based on this, this embodiment can realize the accurate calculation and adjustment of the motion of the multidisciplinary system, and further improve the accuracy of the control rod drive mechanism in controlling the start-up and shutdown of the reactor and the adjustment of the reaction power.

[0069] In this embodiment, the implementation manner of the data acquisition module includes various types, as long as it can obtain the first motion state and the first drive current signal of the control rod at the previous sampling moment in any sampling period.

[0070] It should be noted that the time interval between the previous sampling moment and the current sampling moment in this embodiment is determined by the infinitesimal method. In a possible implementation manner, the above determination method is as follows:

[0071] Taking the single-step motion process of the control rod drive mechanism as the sampling period, the sampling period is divided into multiple time infinitesimals with the same time interval based on the infinitesimal method to obtain the time interval between the current sampling moment and the previous sampling moment. Among them, the expression of the time infinitesimal satisfies:

[0072] U = T / Δt;

[0073] In the formula, U is the total number of time infinitesimals; T is the sampling period; Δt is the value of the time infinitesimal.

[0074] Specifically, the single-step motion process of the control rod drive mechanism is divided into several time micro-elements, and the division of each time micro-element can ensure that the fluctuation between the numerical values of the loads in each discipline does not exceed 5%. When the single-step motion process satisfies [0, T], based on the micro-element method, the above step motion process can be divided into U time intervals Δt. Taking the time interval (t, t + Δt) as an example, the loads in each discipline and the motion parameters of the drive mechanism within this time interval can be regarded as constant values.

[0075] In this embodiment, there are multiple implementation manners for the data processing module. In a possible implementation manner, please refer to Figure 2 and Figure 3 , Figure 2 which shows a schematic structural diagram of the data processing module in this embodiment; Figure 3 which shows the data processing flow between the data acquisition module and the data processing module under the multi-disciplinary simulation adjustment system of the control rod drive mechanism in this embodiment.

[0076] Among them, the data processing module 102 includes an electromagnetic calculation unit 201, a fluid calculation unit 202, and a dynamics calculation unit 203. The output end of the electromagnetic calculation unit 201 is connected to the input ends of the fluid calculation unit 202 and the dynamics calculation unit 203, and the output end of the fluid calculation unit 202 is also connected to the input end of the dynamics calculation unit 203.

[0077] In this embodiment, the electromagnetic calculation unit 201 is configured to determine the electromagnetic force of the control rod at the current sampling moment based on the drive current signal and the target motion state at the previous sampling moment.

[0078] In this embodiment, if the electromagnetic force is calculated starting from the starting moment, the state parameters corresponding to the starting moment are used as the drive current signal and the target motion state at the previous sampling moment described in this article. Among them, the state parameters corresponding to the starting moment include the current at the starting moment and the displacement, velocity, and acceleration at the initial moment.

[0079] Similarly, if the electromagnetic force is not calculated starting from the starting moment, the state parameters corresponding to the current moment can be directly obtained and used as the drive current signal and the target motion state at the previous sampling moment described in this article.

[0080] In this embodiment, the fluid calculation unit 202 is configured to determine the fluid resistance of the control rod at the current sampling moment based on the target motion state.

[0081] Among them, the specific calculation processes of the above-mentioned dynamics calculation unit, fluid calculation unit, and electromagnetic calculation unit can be directly solved by using simulation software for modeling.

[0082] Please continue to refer to Figure 3, in a possible implementation manner, when the target motion state includes the first velocity U(t), the first displacement and the first acceleration , the electromagnetic calculation unit is configured to determine the electromagnetic force of the control rod at the current sampling moment according to the first velocity U(t), the first displacement and the first acceleration ; wherein, the calculation equation of the electromagnetic calculation unit is expressed as:

[0083]

[0084] In the formula, F e (t + Δt) is the electromagnetic force of the control rod at the current sampling moment t + Δt, and μ is the magnetic permeability; S 1 is the magnetic circuit area at the working gap; N is the number of turns of the lifting coil; I is the current of the lifting coil; r is the fixed magnetic resistance in the magnetic circuit; l 1 is the length of the working gap. Among them, the magnetic permeability μ 0 , the magnetic circuit area S 1 at the working gap, the number of turns N of the lifting coil, the current I of the lifting coil, the fixed magnetic resistance r in the magnetic circuit, and the length l of the working gap 1 can all be obtained from the control rod drive mechanism (CRDM).

[0085] Please continue to refer to Figure 3 , in this embodiment, the fluid calculation unit can determine the fluid resistance of the control rod at the current sampling moment according to the first displacement, the first velocity, and the first acceleration.

[0086] Among them, the calculation equation of the fluid calculation unit is expressed as:

[0087]

[0088] Among them, F f (t + Δt) is the fluid resistance of the control rod at the current sampling moment t + Δt; U(t) is the displacement at time t; is the velocity at time t; ∑ represents the summation of the parameters of the inner wall and the outer wall; S 2 is the cross-sectional area of the lifting armature; S 3 is the cross-sectional area of the flow channel; c and ζ are the wall resistance coefficient and the local resistance coefficient respectively; ρ is the fluid density; v 0 is the fluid flow velocity; is the velocity of the drive mechanism; Q is the wetted perimeter of the wall; L is the length of the wall; a is the fluid acceleration.

[0089] Please continue to refer to Figure 3, in this embodiment, the dynamics calculation unit 203 is configured to determine the second motion state of the control rod at the current sampling moment according to the fluid resistance, electromagnetic force, and target motion state, where the second motion state includes the second displacement, second velocity, and second acceleration.

[0090] Among them, the calculation equation of the dynamics calculation unit is expressed as:

[0091]

[0092] F(t + Δt) = F e (t + Δt) - F f (t + Δt) - G - F d (t + Δt)

[0093] Among them, U(t + Δt), and are the displacement, velocity, and acceleration at the current sampling moment t + Δt respectively; F(t + Δt) is the load vector of the control rod drive system at the current sampling moment t + Δt; [M], [C], and [K] are the mass matrix, damping matrix, and stiffness matrix of the control rod drive system respectively; F f (t + Δt) is the fluid resistance of the control rod at the current sampling moment t + Δt; G is the gravity of the control rod; F d (t + Δt) is the spring force of the control rod at the current sampling moment t + Δt; F e (t + Δt) is the electromagnetic force of the control rod at the current sampling moment t + Δt. Among them, the calculation formula of the spring force F d (t + Δt) is: F d (t + Δt) = k * {U(t)}; the calculation formula of the gravity G is: G = mg.

[0094] In this embodiment, the electromagnetic calculation unit, fluid calculation unit, and dynamics calculation unit can be developed mathematical models or professional commercial simulation software, including but not limited to: the electromagnetic module is calculated using Maxwell software, the fluid module is calculated using Fluent and CFD software, and the dynamics module is calculated using Adams software.

[0095] When the electromagnetic calculation unit, fluid calculation unit, and dynamics calculation unit are proxy models and other machine learning models constructed using various methods, the model construction methods include but are not limited to: polynomial response surface method, Kriging method, gradient enhanced Kriging method (GEK), support vector basis, and artificial neural network, etc.

[0096] Please refer to Figure 4 , Figure 4Another schematic structural diagram of the data processing module in this embodiment is shown. Among them, the data processing module 102 further includes a judgment unit 204, and the input end of the judgment unit 204 is connected to the output end of the dynamics calculation unit 203.

[0097] In this embodiment, the judgment unit 204 is used to judge whether the value of the second displacement is equal to a first preset threshold. If it is equal, then judge whether the value of the second speed is greater than a second preset threshold. If it is greater, it is determined that the moving rod impacts overload at the current sampling moment, and the value of the first drive current signal is reduced to update the target current signal; if it is less, then judge whether the value corresponding to the current sampling moment is greater than a third preset threshold. If it is greater, it is determined that the lifting time of the moving rod exceeds the limit at the current sampling moment, and the value of the drive current signal is increased to update the target current signal.

[0098] The judgment unit 204 is further used to, when the value of the second displacement is not equal to the first preset threshold, judge whether the value of the second speed is equal to a fourth preset threshold, and at the same time judge whether the value corresponding to the current sampling moment is greater than a fifth preset threshold. If the above conditions are met, it is determined that the moving rod is locked at the current sampling moment, and the value of the drive current signal is increased to update the target current signal; if the above conditions are not met, then judge whether the value of the second speed is less than the fourth preset threshold. If so, it is determined that the moving rod slips at the current sampling moment, and the value of the drive current signal is increased to update the target current signal. Among them, the fourth preset threshold is less than the second preset threshold.

[0099] In a possible implementation manner, please refer to Figure 5 , Figure 5 A schematic flow diagram of the data processing module in this embodiment is shown. In a possible implementation manner, it is possible to judge whether the first preset threshold is satisfied according to the obtained value of the second displacement. For example, 15.875 mm. If it is satisfied, then subsequently judge whether the second speed is greater than the maximum allowable impact speed V max , if it is greater, it is determined that the moving rod impacts overload at the current sampling moment, and the value of the drive current signal needs to be reduced.

[0100] If the second speed is less than or equal to the maximum allowable impact speed V max , then it is necessary to further judge the value corresponding to the current sampling moment, that is, whether the running time of the current control rod drive mechanism reaches greater than the maximum allowable lifting time t max , if it is greater, it is determined that the moving rod impacts overload at the current sampling moment, and the value of the first drive current signal needs to be reduced, and then the updated target current signal is obtained. If the running time of the current control rod drive mechanism is less than or equal to the maximum allowable lifting time t max, then maintain the target current signal, update the target motion state with the second motion state, iterate cyclically, calculate the second motion state of the control rod at the next sampling moment, and reach the cut-off moment of the current sampling period.

[0101] Please continue to refer to Figure 5 , in this embodiment, if the value of the second displacement obtained by solving is not equal to the first preset threshold, it is further determined whether the value of the second velocity is equal to the fourth preset threshold. For example, whether the value of the second velocity is equal to zero, and it is also necessary to determine whether the value corresponding to the current sampling moment is greater than the fifth preset threshold. The fifth preset threshold can be the maximum allowable start time t L , if the above two conditions are met, it can be determined that the moving rod is in a locked state at the current sampling moment, and the value of the drive current signal needs to be increased, thereby obtaining an updated target current signal. If the above two conditions are not met, it is necessary to further determine whether the value of the second velocity is less than the fourth preset threshold, where the fourth preset threshold is less than the second preset threshold, and the fourth preset threshold is zero. When the value of the second velocity is less than zero, it is determined that the moving rod slips at the current sampling moment, and the value of the drive current signal needs to be increased, thereby obtaining an updated target current signal; if the value of the second velocity is greater than or equal to zero, maintain the target current signal, update the target motion state with the second motion state, iterate cyclically, calculate the second motion state of the control rod at the next sampling moment, and reach the cut-off moment of the current sampling period.

[0102] In another possible implementation manner, when each sampling moment in this embodiment corresponds to an initial drive current signal for the drive rod, the drive current signals corresponding to each sampling moment can be set according to experience, and the present embodiment does not limit the above determination method and / or the determined value.

[0103] When it is determined that a fault occurs in the moving rod drive mechanism at the current sampling moment, the initial value of the drive current signal corresponding to the next sampling moment can be modified according to the fault type to update the current signal at the next sampling moment.

[0104] For example, similar to the previous embodiment, it can be determined whether the value of the second displacement obtained by solving meets the first preset threshold, such as 15.875 mm. If it is met, then it is subsequently determined whether the second velocity is greater than the maximum allowable impact velocity V max , if it is greater, it is determined that the moving rod is overloaded by impact at the current sampling moment, and the initial value of the drive current signal at the next sampling moment needs to be reduced.

[0105] If the second velocity is less than or equal to the maximum allowable impact velocity V max , then it is necessary to further determine the value corresponding to the current sampling moment, that is, whether the running time of the current control rod drive mechanism has reached greater than the maximum allowable lifting time tmax If it is greater than, it is determined that the moving rod impacts overload at the current sampling moment, and it is necessary to reduce the initial value of the drive current signal at the next sampling moment.

[0106] Similarly, in this embodiment, if the value of the second displacement obtained by solving is not equal to the first preset threshold, it is further determined whether the value of the second velocity is equal to the fourth preset threshold. For example, whether the value of the second velocity is equal to zero, and it is also necessary to determine whether the value corresponding to the current sampling moment is greater than the fifth preset threshold. The fifth preset threshold can be the maximum allowable start time t L If the above two conditions are met, it can be determined that the moving rod is in a locked state at the current sampling moment, and it is necessary to increase the initial value of the drive current signal at the next sampling moment. If the above two conditions are not met, it is necessary to further determine whether the value of the second velocity is less than the fourth preset threshold, where the fourth preset threshold is less than the second preset threshold, and the fourth preset threshold is zero. When the value of the second velocity is less than zero, it is determined that the moving rod slides down at the current sampling moment, and it is necessary to increase the initial value of the drive current signal at the next sampling moment.

[0107] In summary, in the control rod drive mechanism multi-disciplinary simulation adjustment system of the present invention, it includes a data acquisition module and a data processing module connected in sequence. The data acquisition module is used to obtain the first motion state and the first drive current signal of the control rod at the previous sampling moment for any sampling period, and use the first motion state as the target motion state; use the first drive current signal as the target current signal. The data processing module is used to determine the second motion state of the control rod at the current sampling moment based on the target motion state and the target current signal. The data processing module is also used to determine the fault state of the control rod drive mechanism based on the motion parameters in the second motion state, and when a fault occurs, adjust the value of the target current signal corresponding to the type of the fault state to obtain a new target current signal, and use the second motion state as the new target motion state, and return to execute the step of determining the second motion state of the control rod at the current sampling moment based on the target motion state and the target current signal until the cut-off moment of the current sampling period is reached, and obtain the motion state of the control rod in the current sampling period. The present invention can achieve accurate calculation and adjustment of the motion of the multi-disciplinary system, and further improve the accuracy of the control rod drive mechanism to control the start and stop of the reactor and the adjustment of the reaction power.

[0108] Second Embodiment

[0109] For the same idea as the previous embodiment, please refer to Figure 6 , Figure 6 shows the flowchart of the steps of the control rod drive mechanism multi-disciplinary simulation adjustment method in this embodiment. Among them, the control rod drive mechanism multi-disciplinary simulation adjustment method includes S1 to S4.

[0110] S1. For any sampling period, obtain the first motion state and the first drive current signal of the control rod at the previous sampling moment; and use the first motion state as the target motion state and the first drive current signal as the target current signal.

[0111] Among them, the sampling period includes multiple sampling moments;

[0112] S2. Determine the second motion state of the control rod at the current sampling moment based on the target motion state and the target current signal.

[0113] Among them, the time interval between the current sampling moment and the previous sampling moment is determined by the infinitesimal method.

[0114] S3. Determine the fault state type of the control rod drive mechanism according to the motion parameters in the second motion state, and correspondingly adjust the value of the target current signal according to the fault state type, update the target current signal, update the target motion state with the second motion state, and return to execute the step of determining the second motion state of the control rod at the current sampling moment based on the target motion state and the target current signal until the cut-off moment of the current sampling period is reached, and obtain the motion state of the control rod in the current sampling period.

[0115] Please refer to Figure 7 , Figure 7 , which shows the step-by-step flowchart of S2 in this embodiment. Among them, when the target motion state includes the first speed, the first displacement, and the first acceleration, the steps of determining the second motion state of the control rod at the current sampling moment based on the target motion state and the target current signal include S21 to S23.

[0116] S21. Determine the electromagnetic force of the control rod at the current sampling moment based on the drive current signal, the first displacement, and the first speed at the previous sampling moment.

[0117] S22. Determine the fluid resistance of the control rod at the current sampling moment based on the first displacement, the first speed, and the first acceleration.

[0118] S23. Determine the second motion state of the control rod at the current sampling moment based on the fluid resistance, the electromagnetic force, the first displacement, the first speed, and the first acceleration.

[0119] In this embodiment, a method for determining the time interval between the current sampling moment and the previous sampling moment is also provided. The specific method is as follows: Take the single-step motion process of the control rod drive mechanism as the sampling period, and divide the sampling period into multiple time infinitesimals with the same time interval based on the infinitesimal method to obtain the time interval between the current sampling moment and the previous sampling moment.

[0120] Among them, the expression of the time infinitesimal satisfies:

[0121] U = T / Δt;

[0122] In the formula, U is the total number of time micro-elements; T is the sampling period; Δt is the value of the time micro-element.

[0123] In summary, the present invention can achieve accurate calculation and adjustment of the motion of a multi-disciplinary system, thereby improving the accuracy of the control rod drive mechanism in controlling the start-up and shutdown of the reactor and adjusting the reaction power.

[0124] With the same idea as the previous embodiment, the present invention also provides a control device, including a processor and a memory. The memory stores machine-executable instructions that can be executed by the processor. The processor can execute the machine-executable instructions to implement the following steps: for any sampling period, obtain the first motion state and the first drive current signal of the control rod at the previous sampling moment; and use the first motion state as the target motion state and the first drive current signal as the target current signal. Wherein, the sampling period includes multiple sampling moments. Determine the second motion state of the control rod at the current sampling moment according to the target motion state and the target current signal. Wherein, the time interval between the current sampling moment and the previous sampling moment is determined by the micro-element method. Determine the type of fault state of the control rod drive mechanism according to the motion parameters in the second motion state, and correspondingly adjust the value of the target current signal according to the type of fault state, update the target current signal, update the target motion state with the second motion state, and return to execute the step of determining the second motion state of the control rod at the current sampling moment according to the target motion state and the target current signal until the cut-off moment of the current sampling period is reached, and obtain the motion state of the control rod in the current sampling period.

[0125] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are only illustrative. For example, the flowcharts and block diagrams in the drawings show the possible architectures, functions, and operations of devices, methods, and computer program products according to multiple embodiments of the present invention. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0126] In addition, in each embodiment of the present invention, each functional module may be integrated together to form an independent part, or each module may exist alone, or two or more modules may be integrated to form an independent part.

[0127] If the above-mentioned function is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs.

[0128] The foregoing are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multidisciplinary simulation adjustment system for a control rod drive mechanism, characterized in that: include: A data acquisition module and a data processing module connected in sequence; The data acquisition module is used to obtain the first motion state and the first driving current signal of the lower control rod at the last sampling moment for any sampling period, and use the first motion state as the target motion state; The first driving current signal is used as a target current signal; wherein the sampling period includes a plurality of sampling moments; The data processing module is used to determine the second motion state of the control rod at the current sampling moment according to the target motion state and the target current signal; wherein the time interval between the current sampling moment and the previous sampling moment is determined by a differential element method; The data processing module is further used to determine the fault state type of the control rod drive mechanism according to each motion parameter in the second motion state, and adjust the value of the target current signal according to the fault state type, update the target current signal, update the target motion state with the second motion state, and return to execute the step of determining the second motion state of the control rod at the current sampling time according to the target motion state and the target current signal until the end time of the current sampling period is reached, so as to obtain the motion state of the control rod at the current sampling period; The data processing module includes an electromagnetic calculation unit, a fluid calculation unit, and a dynamics calculation unit, wherein the output end of the electromagnetic calculation unit is connected to the input end of the fluid calculation unit and the input end of the dynamics calculation unit, and the output end of the fluid calculation unit is also connected to the input end of the dynamics calculation unit; The electromagnetic calculation unit is used to determine the electromagnetic force of the control rod at the current sampling moment according to the driving current signal at the previous sampling moment and the target motion state; The fluid calculation unit is used to determine the fluid resistance of the control rod at the current sampling moment according to the target motion state; The dynamics calculation unit is used to determine the second motion state of the control rod at the current sampling moment according to the fluid resistance, the electromagnetic force and the target motion state, wherein the second motion state includes a second displacement, a second velocity and a second acceleration.

2. The multidisciplinary simulation adjustment system for control rod drive mechanism according to claim 1, characterized in that: When the target motion state includes a first velocity, a first displacement, and a first acceleration, The electromagnetic calculation unit is used to determine the electromagnetic force of the control rod at the current sampling moment according to the driving current signal at the previous sampling moment, the first displacement, and the first speed; The fluid calculation unit is used to determine the fluid resistance of the control rod at a current sampling moment according to the first displacement, the first velocity and the first acceleration; The dynamics calculation unit is used to determine the second motion state of the control rod at a current sampling moment according to the fluid resistance, the electromagnetic force, the first displacement, the first velocity, and the first acceleration.

3. The multidisciplinary simulation adjustment system for control rod drive mechanism according to claim 1, characterized in that: The data processing module further comprises a judgment unit, the input end of the judgment unit is connected to the output end of the dynamics calculation unit; The judging unit is used to judge whether the value of the second displacement is equal to a first preset threshold value, and if so, to judge whether the value of the second speed is greater than the second preset threshold value, and if so, to judge that the moving rod is impact overloaded at the current sampling moment, and to reduce the value of the first driving current signal to update the target current signal; If it is less than, determine whether the value corresponding to the current sampling moment is greater than the third preset threshold; if it is greater, determine that the moving rod lifting time at the current sampling moment is excessive, increase the value of the driving current signal to update the target current signal.

4. The multidisciplinary simulation adjustment system for control rod drive mechanism according to claim 3 is characterized in that: The judging unit is further configured to judge whether the value of the second speed is equal to a fourth preset threshold value when the value of the second displacement is not equal to the first preset threshold value, and whether the value corresponding to the current sampling moment is greater than a fifth preset threshold value. If the above conditions are met, it is determined that the moving rod is locked at the current sampling moment, and the value of the driving current signal is increased to update the target current signal; If the above conditions are not met, it is determined whether the value of the second speed is less than a fourth preset threshold value. If so, it is determined that the moving rod has slipped at the current sampling moment, and the value of the driving current signal is increased to update the target current signal. The fourth preset threshold is smaller than the second preset threshold.

5. The multidisciplinary simulation adjustment system for control rod drive mechanism according to claim 2, characterized in that: The calculation equation of the dynamics calculation unit is expressed as: in, , and The current sampling time displacement, velocity and acceleration; The current sampling time The load vector of the lower control rod drive system; [M], [C] and [K] are the mass matrix, damping matrix and stiffness matrix of the control rod drive system respectively; The current sampling time The fluid resistance of the lower control rod; G is the weight of the control rod; The current sampling time The spring force of the lower control rod; The current sampling time The electromagnetic force on the lower control rod.

6. The multidisciplinary simulation adjustment system for control rod drive mechanism according to claim 1, characterized in that: The step of determining the time interval between the current sampling moment and the previous sampling moment by using the differential element method comprises: Taking a single step motion process of the control rod drive mechanism as a sampling period, dividing the sampling period into a plurality of time elements with the same time interval based on the microelement method, and obtaining the time interval between the current sampling moment and the previous sampling moment; The expression of the time element satisfies: U=T / Δt; In the figure, U is the total number of time elements; T is the sampling period; Δt is the value of the time element.

7. A multidisciplinary simulation adjustment method for a control rod drive mechanism, characterized in that: The control rod drive mechanism multidisciplinary simulation adjustment method comprises the following steps: For any sampling period, a first motion state and a first drive current signal of the lower control rod at a previous sampling moment are obtained; and the first motion state is used as a target motion state, and the first drive current signal is used as a target current signal; wherein the sampling period includes a plurality of sampling moments; Determine the second motion state of the control rod at the current sampling moment according to the target motion state and the target current signal; wherein the time interval between the current sampling moment and the previous sampling moment is determined by a differential element method; determining the fault state type of the control rod drive mechanism according to each motion parameter in the second motion state, adjusting the value of the target current signal according to the fault state type, updating the target current signal, and updating the target motion state with the second motion state, returning to the step of determining the second motion state of the control rod at the current sampling time according to the target motion state and the target current signal, until the end time of the current sampling period is reached, and obtaining the motion state of the control rod at the current sampling period; When the target motion state includes a first velocity, a first displacement, and a first acceleration, the step of determining a second motion state of the control rod at a current sampling moment according to the target motion state and the target current signal includes: determining the electromagnetic force of the control rod at the current sampling moment according to the driving current signal at the previous sampling moment, the first displacement, and the first speed; determining a fluid resistance of a control rod at a current sampling moment according to the first displacement, the first velocity, and the first acceleration; A second motion state of the control rod at a current sampling moment is determined according to the fluid resistance, the electromagnetic force, the first displacement, the first velocity, and the first acceleration.

8. The multidisciplinary simulation adjustment method for a control rod drive mechanism according to claim 7, characterized in that: The step of determining the time interval between the current sampling moment and the previous sampling moment by using the differential element method comprises: Taking a single step motion process of the control rod drive mechanism as a sampling period, dividing the sampling period into a plurality of time elements with the same time interval based on the microelement method, and obtaining the time interval between the current sampling moment and the previous sampling moment; The expression of the time element satisfies: U=T / Δt; In the figure, U is the total number of time elements; T is the sampling period; Δt is the value of the time element.

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