Reactor control rod drive system dynamic digital modeling method, system and equipment

Abstract

The present invention discloses a method, system and equipment for dynamic digital modeling of a reactor control rod drive system. The method comprises: establishing an electromagnetic field two-dimensional data table of the control rod drive system through a mode combining theory, simulation and actual operation; the input signal of the electromagnetic field two-dimensional data table is the current value and displacement value of the three coils of the drive mechanism, and the output signal is the resistance value, inductance value and electromagnetic force value of the three coils of the drive mechanism; according to the electromagnetic field two-dimensional data table, establishing a dynamic digital model of the electrical performance of the control rod drive system; the dynamic digital model uses the control command and the actual current measured value of the three coils of the drive mechanism as input, and can predict the change of the resistance value and inductance value of the three coils of the drive mechanism of the control rod drive system at the next moment. The present invention lays a solid foundation for the subsequent realization of a highly efficient adaptive control strategy, solves the problem of manually setting control parameters for many times, and thus reduces the burden on operators and maintenance personnel.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power plants, and in particular to a method, system and equipment for dynamic digital modeling of a reactor control rod drive system. Background Art

[0002] The reactivity of the nuclear power plant reactor is mainly adjusted by the control rod drive system to drive the movement of the control rods. This is to achieve the start-up, power regulation, normal shutdown and emergency shutdown of the reactor. The control loop of the control rod drive system is a complex dynamic process that combines magnetic field, kinematic field and electric field, and the three are coupled with each other. This complex dynamic process will bring about dynamic nonlinear changes in the electrical performance of the system. Due to the lack of accurate digital modeling of the dynamic change process of the control rod drive system, the existing nuclear power plant control rod drive system control device has poor control effect under different operating environments. In order to meet the transient response time and steady-state control accuracy, it is necessary to manually adjust the control parameters multiple times through manual judgment.

[0003] In current research, the existing control strategy of the control rod drive system of nuclear power plants lacks a complete construction and digital reproduction of the changing trend of the electrical performance of the system control loop, resulting in the inability to implement efficient adaptive control strategies under different operating environments. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the existing control strategy of the control rod drive system of a nuclear power plant lacks a complete construction and digital reproduction of the changing trend of the electrical performance of the system control loop, resulting in the inability to implement a highly efficient adaptive control strategy under different operating environments, and also requiring multiple manual control parameter adjustments through human judgment.

[0005] The purpose of the present invention is to provide a method, system and equipment for dynamic digital modeling of a reactor control rod drive system. The method of the present invention innovatively breaks through the existing control strategy of the control rod drive system of a nuclear power plant, lacks a complete construction and digital reproduction of the trend of changes in the electrical performance of the system, and thus leads to a research bottleneck. Through a mode combining theory, simulation and actual operation, the characteristics of the drive system under different states are analyzed; and according to different state characteristics, the state input information of the system under different working conditions is sorted out to obtain the electrical performance parameter (resistance value and inductance value) data of the system under all working conditions; finally, based on the data, a fully digital model of the electrical performance of the control rod drive system is established to achieve a complete construction and digital reproduction of the trend of changes in the electrical performance of the system control loop. The present invention achieves the purpose of predicting the electrical performance parameters of the system at the next moment by relying only on the control instructions and the current value at the current moment. The present invention lays a solid foundation for the subsequent realization of a highly efficient adaptive control strategy, solves the problem of manually setting control parameters for many times, and thus reduces the burden on operators and maintenance personnel.

[0006] The present invention is achieved through the following technical solutions:

[0007] In a first aspect, the present invention provides a method for dynamic digital modeling of a reactor control rod drive system, the method comprising:

[0008] Through the combination of theory, simulation and actual operation, the electromagnetic field two-dimensional data table of the control rod drive system is established; the input signal of the electromagnetic field two-dimensional data table is the current value and displacement value of the three coils of the drive mechanism, and the output signal of the electromagnetic field two-dimensional data table is the resistance value, inductance value and electromagnetic force value of the three coils of the drive mechanism;

[0009] According to the two-dimensional data table of electromagnetic field, a dynamic digital model of the electrical performance of the control rod drive system is established; the dynamic digital model takes the control command and the actual measured current values ​​of the three coils of the drive mechanism as input, and can accurately predict the changes in the resistance and inductance values ​​of the three coils of the control rod drive system at the next moment.

[0010] Further, the three coils of the driving mechanism include a lifting coil, a moving coil and a holding coil.

[0011] Furthermore, through the combination of theory, simulation and actual operation, a two-dimensional data table of electromagnetic field of the control rod drive system is established, including:

[0012] Construct an accurate electromagnetic simulation model of the entire control rod drive system, and use the electromagnetic simulation model to simulate the distribution of magnetic flux lines and magnetic field strength of the control rod drive system under different coil current input values ​​and different motion displacements;

[0013] Sorting out all the working conditions that the control rod drive system will experience in the actual working process, and dividing the control rod drive system into different working stages according to the different current sizes of the control rod drive system;

[0014] Taking different coils (lifting coil, moving coil and holding coil) as objects, all working conditions that need to be simulated by electromagnetics are determined according to the motion displacement information of different working stages;

[0015] All working conditions are simulated in the electromagnetic simulation model to obtain the inductance and resistance values ​​of the lifting coil, the moving coil and the holding coil under all working conditions, and the electromagnetic force data of the three coils in all cases.

[0016] Furthermore, a dynamic digital model of the electrical performance of the control rod drive system is established based on the two-dimensional electromagnetic field data table, including:

[0017] Divide the working phases of the control rod drive system according to the current control command of the control rod drive system;

[0018] Taking different coils (lifting coil, moving coil and holding coil) as objects, the working conditions of the three coils are divided, and it is judged whether the current working condition is static or dynamic. The initial displacement values ​​and displacement ranges of the three coils are determined according to different working conditions, and the changes in resistance and inductance values ​​of the three coils of the control rod drive system driving mechanism at the next moment are predicted.

[0019] Further, it is judged whether the current working condition is a static or dynamic working condition, and the initial displacement values ​​and displacement ranges of the three coils are determined according to different working conditions, and the changes in the resistance and inductance values ​​of the three coils of the driving mechanism of the control rod drive system at the next moment are predicted, including:

[0020] If the current control rod drive system is judged to be in a static state according to the control instruction, the resistance and inductance values ​​of the three coils at the next moment are directly found in the electromagnetic field two-dimensional data table according to the current of the three coils and the initial displacement values ​​of the coils at the current moment;

[0021] If it is determined according to the control instructions that the current control rod drive system belongs to a dynamic working condition, the electromagnetic lifting force of the three coils at the next moment is directly found in the electromagnetic field two-dimensional data table according to the current of the three coils and the initial displacement value of the coils at the current moment; and the displacement value of the three coils at the next moment is calculated in the electromagnetic force kinematic model according to the electromagnetic lifting force; finally, the resistance and inductance values ​​of the three coils at the next moment are found in the electromagnetic field two-dimensional data table according to the current of the three coils at the current moment and the displacement value of the coils at the next moment.

[0022] Furthermore, the calculation process of the electromagnetic force kinematic model is:

[0023] Step A, obtaining the displacement value and electromagnetic force of the control rod drive system at the current moment;

[0024] Step B, determining whether the displacement value of the control rod drive system at the current moment is greater than or equal to the maximum displacement of the control rod drive system, if so, executing step C; if not, executing step D;

[0025] Step C, determining whether the electromagnetic force of the control rod drive system at the current moment is greater than or equal to the configuration of the control rod drive system itself, if so, the displacement value at the next moment is equal to the displacement value of the control rod drive system at the current moment; if not, the displacement value at the next moment is equal to 0; and continuing to step F;

[0026] Step D, judging whether the electromagnetic force of the control rod drive system at the current moment is greater than or equal to the configuration of the control rod drive system itself, if yes, executing step E; if no, the displacement value at the next moment is equal to the displacement value of the control rod drive system at the current moment;

[0027] Step E, calculating the acceleration of the moving parts of the control rod drive system at the current moment, calculating the speed of the moving parts of the control rod drive system at the current moment according to the acceleration at the current moment, and then calculating the maximum displacement of the control rod drive system at the next moment; judging whether the maximum displacement at the next moment is greater than or equal to the maximum displacement of the control rod drive system, if so, the displacement value at the next moment is equal to the maximum displacement at the next moment; if not, the displacement value at the next moment is equal to the maximum displacement of the control rod drive system; and continuing to step F;

[0028] Step F, output the displacement value at the next moment.

[0029] In a second aspect, the present invention further provides a reactor control rod drive system dynamic digital modeling system, the system using the above reactor control rod drive system dynamic digital modeling method; the system comprises:

[0030] The electromagnetic field two-dimensional data table establishment unit is used to establish the electromagnetic field two-dimensional data table of the control rod drive system through a mode combining theory, simulation and actual operation; the input signal of the electromagnetic field two-dimensional data table is the current value and displacement value of the three coils of the drive mechanism, and the output signal of the electromagnetic field two-dimensional data table is the resistance value, inductance value and electromagnetic force value of the three coils of the drive mechanism;

[0031] The dynamic digital model building unit is used to build a dynamic digital model of the electrical performance of the control rod drive system based on the two-dimensional electromagnetic field data table; the dynamic digital model takes the control command and the actual current measured values ​​of the three coils of the drive mechanism as input, and can accurately predict the changes in the resistance and inductance values ​​of the three coils of the control rod drive system at the next moment.

[0032] Further, the electromagnetic field two-dimensional data table establishment unit includes an electromagnetic simulation model construction subunit, an actual working stage division subunit, a full working condition determination subunit and a simulation subunit;

[0033] The electromagnetic simulation model building subunit is used to build an accurate electromagnetic simulation model of the entire control rod drive system. The electromagnetic simulation model is used to simulate the distribution of magnetic flux lines and magnetic field strength of the control rod drive system under different coil current input values ​​and different motion displacements;

[0034] The actual working stage division subunit is used to sort out all the working conditions that the control rod drive system will experience during the actual working process, and divide the control rod drive system into different working stages according to the different current sizes of the control rod drive system;

[0035] The subunit for determining all working conditions is used to determine all working conditions that need to be subjected to electromagnetic simulation according to the motion displacement information of different working stages, taking different coils (lifting coil, moving coil and holding coil) as objects respectively;

[0036] The simulation subunit is used to simulate all working conditions in the electromagnetic simulation model, obtain the inductance and resistance values ​​of the lifting coil, the moving coil and the holding coil under all working conditions, and obtain the electromagnetic force data of the three coils under all conditions.

[0037] Furthermore, the dynamic digital model building unit includes a working stage division subunit and a working condition judgment and prediction subunit;

[0038] A working phase division subunit is used to divide the working phase of the control rod drive system according to the control command of the current control rod drive system;

[0039] The working condition judgment and prediction subunit is used to divide the working conditions of the three coils (lifting coil, moving coil and holding coil) respectively, judge whether the current working condition is static or dynamic, and determine the displacement initial value and displacement range of the three coils according to different working conditions, and predict the resistance and inductance changes of the three coils of the control rod drive system driving mechanism at the next moment, including:

[0040] If the current control rod drive system is judged to be in a static state according to the control instruction, the resistance and inductance values ​​of the three coils at the next moment are directly found in the electromagnetic field two-dimensional data table according to the current of the three coils and the initial displacement values ​​of the coils at the current moment;

[0041] If it is determined according to the control instructions that the current control rod drive system belongs to a dynamic working condition, the electromagnetic lifting force of the three coils at the next moment is directly found in the electromagnetic field two-dimensional data table according to the current of the three coils and the initial displacement value of the coils at the current moment; and the displacement value of the three coils at the next moment is calculated in the electromagnetic force kinematic model according to the electromagnetic lifting force; finally, the resistance and inductance values ​​of the three coils at the next moment are found in the electromagnetic field two-dimensional data table according to the current of the three coils at the current moment and the displacement value of the coils at the next moment.

[0042] In a third aspect, the present invention provides a computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method for dynamic digital modeling of a reactor control rod drive system when executing the computer program.

[0043] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0044] 1. The method, system and equipment for dynamic digital modeling of the reactor control rod drive system of the present invention innovatively breaks through the existing control strategy of the control rod drive system of nuclear power plants, lacks the complete construction and digital reproduction of the trend of changes in the electrical performance of the system, and thus leads to research bottlenecks. Through a mode combining theory, simulation and actual operation, the characteristics of the drive system under different states are analyzed; and according to different state characteristics, the state input information of the system under different working conditions is sorted out to obtain the electrical performance parameter (resistance value and inductance value) data of the system under all working conditions; finally, based on the data, a fully digital model of the electrical performance of the control rod drive system is established to achieve the complete construction and digital reproduction of the trend of changes in the electrical performance of the system control loop. The present invention achieves the purpose of predicting the electrical performance parameters of the system at the next moment by relying only on the control instructions and the current value at the current moment. The present invention lays a solid foundation for the subsequent realization of efficient adaptive control strategies, solves the problem of manual setting of control parameters for many times, and thus reduces the burden on operators and maintenance personnel.

[0045] 2. The method, system and equipment for dynamic digital modeling of the reactor control rod drive system of the present invention are applicable to all pressurized water reactor nuclear power plants that are in operation or under construction. The scope of application is quite wide and has the advantages of strong real-time performance, high reliability and good expandability. At the same time, the above advantages can significantly improve the automation and intelligence level of the system, reduce the manpower requirements and time cost of on-site operation and maintenance of nuclear power plants, and have significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0047] Figure 1 This is a flow chart of the dynamic digital modeling method of the reactor control rod drive system of the present invention;

[0048] Figure 2 A flow chart for establishing a dynamic digital model of the present invention;

[0049] Figure 3 It is a flow chart of the mathematical model of electromagnetic force motion of the control rod drive system of the present invention;

[0050] Figure 4 A schematic diagram of the division of control command working phases of the control rod drive system of the present invention;

[0051] Figure 5 It is a schematic diagram of the resistance variation trend of the lifting coil of the control rod drive system under the lifting command of the present invention;

[0052] Figure 6It is a schematic diagram of the inductance variation trend of the lifting coil of the control rod drive system under the lifting command of the present invention;

[0053] Figure 7 This is a structural block diagram of the dynamic digital modeling system of the reactor control rod drive system of the present invention;

[0054] Figure 8 A structural block diagram of a unit for establishing a two-dimensional electromagnetic field data table according to the present invention;

[0055] Fig. 9 The structural block diagram of the dynamic digital model building unit of the present invention. DETAILED DESCRIPTION

[0056] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0057] The reactivity of the nuclear power plant reactor is mainly adjusted by the control rod drive system to drive the movement of the control rods. This is to achieve the functions of reactor startup, power regulation, normal shutdown and emergency shutdown. The control loop of the control rod drive system is a complex dynamic process that combines electric field, kinematic field and magnetic field, and the three are coupled with each other. This complex dynamic process will bring about dynamic nonlinear changes in the electrical performance of the system. Previously, due to the lack of accurate digital modeling of the dynamic change process of the control rod drive system, the existing nuclear power plant control rod drive system control device has poor control effect under different operating environments. In order to meet the transient response time and steady-state control accuracy, it is necessary to manually adjust the control parameters multiple times through manual judgment.

[0058] However, in current research, the main factor restricting the realization of adaptive control strategies in different operating environments is the lack of complete construction and digital reproduction of the changing trend of the electrical performance of the system control loop. That is, the existing control strategy of the control rod drive system of nuclear power plants lacks the complete construction and digital reproduction of the changing trend of the electrical performance of the system control loop, which leads to the inability to realize efficient adaptive control strategies in different operating environments, and the problem of multiple manual control parameter adjustments through manual judgment is required.

[0059] The present invention takes into account that the main control target of the control rod drive system is the current of the three coils of the drive mechanism (lifting coil, moving coil and holding coil), and the main electrical performance parameters that affect the current control effect are the resistance and inductance of the three coils. Under the conditions of changes in the system working environment and dynamic operation, the resistance and inductance values ​​in the control loop will change significantly. Therefore, it is necessary to combine theoretical analysis and simulation to obtain the changes in system parameters, and then make corrections by comparing with actual parameters to obtain the complete parameter change law. Finally, the digital change law is combined with the control loop, which is helpful for the study of the self-correction technology of control parameters.

[0060] Therefore, the present invention proposes a method, system and equipment for dynamic digital modeling of the electrical performance of a reactor control rod drive system. Through a mode combining theory, simulation and actual operation, the characteristics of the drive system under different states are analyzed; and according to different state characteristics, the state input information of the system under different working conditions is sorted out to obtain the electrical performance parameter (resistance value and inductance value) data of the system under all working conditions; finally, based on the data, a fully digital model of the electrical performance of the control rod drive system is established to achieve the complete construction and digital reproduction of the change trend of the electrical performance of the system control loop. The present invention achieves the purpose of predicting the electrical performance parameters of the system at the next moment by relying only on the control instructions and the current value at the current moment. The present invention lays a solid foundation for the subsequent realization of efficient adaptive control strategies, solves the problem of manual setting of control parameters for multiple times, and thus reduces the burden on operators and maintenance personnel.

[0061] The present invention can effectively predict the change forms and trends of the resistance and inductance values ​​of the three coils of the system under different working conditions, which is helpful for the system to subsequently implement a highly efficient adaptive control strategy.

[0062] Example 1

[0063] like Figure 1 As shown, the dynamic digital modeling method of the reactor control rod drive system of the present invention comprises:

[0064] Step 1: Establish an electromagnetic field two-dimensional data table of the control rod drive system through a mode combining theory, simulation and actual operation; the electromagnetic field two-dimensional data table serves as the operating basis of the dynamic digital model of electrical performance. The input signals of the electromagnetic field two-dimensional data table are the current value and displacement value of the three coils (lifting coil, moving coil and holding coil) of the drive mechanism, and the output signals of the electromagnetic field two-dimensional data table are the resistance value, inductance value and electromagnetic force value of the three coils of the drive mechanism;

[0065] Step 1 specifically includes:

[0066] Step 11, constructing an accurate electromagnetic simulation model of the entire control rod drive system. The electromagnetic simulation model can be used to simulate the distribution of magnetic flux lines and magnetic field strength of the control rod drive system under different coil current value inputs and different motion displacements;

[0067] Step 12, sorting out all the working conditions that the control rod drive system will experience in the actual working process, and dividing the control rod drive system into different working stages according to different current sizes of the control rod drive system;

[0068] Step 13, taking the lifting coil, the moving coil and the holding coil as objects respectively, and determining all the working conditions that need to be subjected to electromagnetic simulation according to the motion displacement information of different working stages;

[0069] Step 14: Simulate all the working conditions listed in step 13 in the electromagnetic simulation model, and obtain the inductance and resistance values ​​of the lifting coil, the moving coil and the holding coil under all working conditions, and obtain the electromagnetic force data of the three coils under all conditions.

[0070] The method of the present invention establishes a two-dimensional data table of the electromagnetic field of the three coils of the control rod drive system, and can obtain the resistance, inductance and electromagnetic force information of the three coils according to the current value and displacement value of the system coil. Table 1 shows the inductance output of the lifting coil under a certain range of current value and displacement value. When the dynamic mathematical model of the system electrical performance uses this table, the current and displacement values ​​can be refined according to the interpolation method.

[0071] Table 1 Two-dimensional table of electromagnetic field data of control rod drive system lifting coil

[0072]

[0073]

[0074] Step 2: Based on the electromagnetic field two-dimensional data table, a dynamic digital model of the electrical performance of the control rod drive system is established; the dynamic digital model uses the control command and the measured current values ​​of the three coils of the drive mechanism as input, and can accurately predict the changes in the resistance and inductance values ​​of the three coils of the control rod drive system at the next moment. The process of establishing the dynamic digital model is as follows: Figure 2 The dynamic digital model can dynamically calculate the resistance and inductance information of the system at the next moment according to the system control command and the actual measured current values ​​of the three coils.

[0075] Step 2 specifically includes:

[0076] Step 21, divide the working phase of the control rod drive system according to the control command of the current control rod drive system; see Figure 4The method of the present invention needs to divide the working phases of the system according to the control command of the control rod drive system. Different working phases are divided according to the different requirements of the three currents of the system when the system is lifting and inserting commands.

[0077] Step 22, taking the lifting coil, the moving coil and the holding coil as objects, the working conditions of the three coils are divided, judging whether the current working condition is a static condition or a dynamic condition, and determining the initial displacement values ​​and displacement ranges of the three coils according to different working conditions, and predicting the changes in resistance and inductance values ​​of the three coils of the control rod drive system driving mechanism at the next moment.

[0078] The working conditions of the three coils are shown in Tables 2, 3 and 4.

[0079] Table 2 Classification of lifting coil working conditions

[0080]

[0081] Table 3 Classification of mobile coil working conditions

[0082]

[0083]

[0084] Table 4 Classification of holding coil working conditions

[0085]

[0086] Step 23, if it is determined according to the control instruction that the current control rod drive system is in a static state, then the resistance and inductance values ​​of the three coils at the next moment are directly found in the electromagnetic field two-dimensional data table according to the currents of the three coils and the initial displacement values ​​of the coils at the current moment;

[0087] Step 24, if it is determined according to the control instruction that the current control rod drive system belongs to a dynamic working condition, then the electromagnetic lifting force of the three coils at the next moment is directly found in the electromagnetic field two-dimensional data table according to the current of the three coils and the initial displacement value of the coils at the current moment; and the displacement value of the three coils at the next moment is calculated in the electromagnetic force kinematic model according to the electromagnetic lifting force; finally, the resistance and inductance values ​​of the three coils at the next moment are found in the electromagnetic field two-dimensional data table according to the current of the three coils at the current moment and the displacement value of the coils at the next moment.

[0088] Specifically, Figure 2 When the system is in a dynamic condition, it is necessary to use the mathematical model of the electromagnetic force motion of the system. Figure 3 It reflects the calculation process of the mathematical model of electromagnetic force motion of the control rod drive system. The model can calculate the displacement value of the system at the next moment based on the displacement value and electromagnetic force information of the current system.

[0089] In this embodiment, the calculation process of the electromagnetic force kinematic model is:

[0090] Step A, obtaining the displacement value and electromagnetic force of the control rod drive system at the current moment;

[0091] Step B, determining whether the displacement value of the control rod drive system at the current moment is greater than or equal to the maximum displacement of the control rod drive system, if so, executing step C; if not, executing step D;

[0092] Step C, determining whether the electromagnetic force of the control rod drive system at the current moment is greater than or equal to the configuration of the control rod drive system itself, if so, the displacement value at the next moment is equal to the displacement value of the control rod drive system at the current moment; if not, the displacement value at the next moment is equal to 0; and continuing to step F;

[0093] Step D, judging whether the electromagnetic force of the control rod drive system at the current moment is greater than or equal to the configuration of the control rod drive system itself, if yes, executing step E; if no, the displacement value at the next moment is equal to the displacement value of the control rod drive system at the current moment;

[0094] Step E, calculating the acceleration of the moving parts of the control rod drive system at the current moment, calculating the speed of the moving parts of the control rod drive system at the current moment according to the acceleration at the current moment, and then calculating the maximum displacement of the control rod drive system at the next moment; judging whether the maximum displacement at the next moment is greater than or equal to the maximum displacement of the control rod drive system, if so, the displacement value at the next moment is equal to the maximum displacement at the next moment; if not, the displacement value at the next moment is equal to the maximum displacement of the control rod drive system; and continuing to step F;

[0095] Step F, output the displacement value at the next moment.

[0096] The method of the present invention establishes a dynamic digital model of the electrical performance of the control rod drive system. The model can dynamically calculate the resistance and inductance information of the system at the next moment according to the control command of the control rod drive system and the actual measured current values ​​of the three coils at present. Figure 5 and Figure 6 That is, the change trend of the corresponding resistance and inductance values ​​under the boost control command.

[0097] The present invention provides a dynamic digital modeling method for a reactor control rod drive system. The method analyzes the characteristics of the drive system under different states by combining theory, simulation and actual operation. According to different state characteristics, the state input information of the system under different working conditions is sorted out to obtain the electrical performance parameter (resistance value and inductance value) data of the system under all working conditions. Finally, based on the data, a fully digital model of the electrical performance of the control rod drive system is established to achieve the purpose of predicting the electrical performance parameters of the system at the next moment by relying only on control instructions and current values ​​at the current moment.

[0098] The present invention is applicable to all pressurized water reactor nuclear power plants that are in operation or under construction, has a wide range of applications, and has the advantages of strong real-time performance, high reliability, good expandability, etc.; at the same time, the above advantages can significantly improve the automation and intelligence level of the system, reduce the manpower requirements and time costs of on-site operation and maintenance of nuclear power plants, and have significant economic benefits.

[0099] Example 2

[0100] like Figures 7 to 9 As shown, the difference between this embodiment and embodiment 1 is that this embodiment provides a dynamic digital modeling system for a reactor control rod drive system, and the system uses the dynamic digital modeling method for a reactor control rod drive system in embodiment 1; the system corresponds one-to-one to the dynamic digital modeling method for a reactor control rod drive system in embodiment 1;

[0101] like Figure 7 As shown, the system includes:

[0102] The electromagnetic field two-dimensional data table establishment unit is used to establish the electromagnetic field two-dimensional data table of the control rod drive system through a mode combining theory, simulation and actual operation; the input signal of the electromagnetic field two-dimensional data table is the current value and displacement value of the three coils of the drive mechanism, and the output signal of the electromagnetic field two-dimensional data table is the resistance value, inductance value and electromagnetic force value of the three coils of the drive mechanism;

[0103] The dynamic digital model building unit is used to build a dynamic digital model of the electrical performance of the control rod drive system based on the two-dimensional electromagnetic field data table; the dynamic digital model takes the control command and the actual current measured values ​​of the three coils of the drive mechanism as input, and can accurately predict the changes in the resistance and inductance values ​​of the three coils of the control rod drive system at the next moment.

[0104] As a further implementation, Figure 8 As shown, the electromagnetic field two-dimensional data table establishment unit includes an electromagnetic simulation model construction subunit, an actual working stage division subunit, a full working condition determination subunit and a simulation subunit;

[0105] The electromagnetic simulation model building subunit is used to build an accurate electromagnetic simulation model of the entire control rod drive system. The electromagnetic simulation model is used to simulate the distribution of magnetic flux lines and magnetic field strength of the control rod drive system under different coil current input values ​​and different motion displacements;

[0106] The actual working stage division subunit is used to sort out all the working conditions that the control rod drive system will experience during the actual working process, and divide the control rod drive system into different working stages according to the different current sizes of the control rod drive system;

[0107] The subunit for determining all working conditions is used to determine all working conditions that need to be subjected to electromagnetic simulation according to the motion displacement information of different working stages, taking different coils (lifting coil, moving coil and holding coil) as objects respectively;

[0108] The simulation subunit is used to simulate all working conditions in the electromagnetic simulation model, obtain the inductance and resistance values ​​of the lifting coil, the moving coil and the holding coil under all working conditions, and obtain the electromagnetic force data of the three coils under all conditions.

[0109] As a further implementation, Fig. 9 As shown, the dynamic digital model building unit includes a working stage division subunit and a working condition judgment and prediction subunit;

[0110] A working phase division subunit is used to divide the working phase of the control rod drive system according to the control command of the current control rod drive system;

[0111] The working condition judgment and prediction subunit is used to divide the working conditions of the three coils (lifting coil, moving coil and holding coil) respectively, judge whether the current working condition is static or dynamic, and determine the displacement initial value and displacement range of the three coils according to different working conditions, and predict the resistance and inductance changes of the three coils of the control rod drive system driving mechanism at the next moment, including:

[0112] If the current control rod drive system is judged to be in a static state according to the control instruction, the resistance and inductance values ​​of the three coils at the next moment are directly found in the electromagnetic field two-dimensional data table according to the current of the three coils and the initial displacement values ​​of the coils at the current moment;

[0113] If it is determined according to the control instructions that the current control rod drive system belongs to a dynamic working condition, the electromagnetic lifting force of the three coils at the next moment is directly found in the electromagnetic field two-dimensional data table according to the current of the three coils and the initial displacement value of the coils at the current moment; and the displacement value of the three coils at the next moment is calculated in the electromagnetic force kinematic model according to the electromagnetic lifting force; finally, the resistance and inductance values ​​of the three coils at the next moment are found in the electromagnetic field two-dimensional data table according to the current of the three coils at the current moment and the displacement value of the coils at the next moment.

[0114] Specifically, the execution process of each unit can be performed according to the process steps of the dynamic digital modeling method of the reactor control rod drive system in Example 1, and will not be described in detail in this embodiment.

[0115] At the same time, the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the dynamic digital modeling method of the reactor control rod drive system of Example 1 is implemented.

[0116] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0117] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0118] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0119] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0120] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dynamic digital modeling method for a reactor control rod drive system, characterized in that: The method includes: By combining theory, simulation and actual operation, a two-dimensional electromagnetic field data table of the control rod drive system is established; the input signals of the two-dimensional electromagnetic field data table are the current value and displacement value of the three coils of the drive mechanism, and the output signals of the two-dimensional electromagnetic field data table are the resistance value, inductance value and electromagnetic force value of the three coils of the drive mechanism; A dynamic digital model of the electrical performance of the control rod drive system is established according to the two-dimensional electromagnetic field data table; the dynamic digital model uses the control command and the actual current measured values ​​of the three coils of the drive mechanism as input, and can predict the changes in the resistance and inductance values ​​of the three coils of the drive mechanism of the control rod drive system at the next moment; According to the electromagnetic field two-dimensional data table, a dynamic digital model of the electrical performance of the control rod drive system is established, including: Divide the working phases of the control rod drive system according to the current control command of the control rod drive system; Taking different coils as objects, the working conditions of the three coils are divided, judging whether the current working condition is static or dynamic, and determining the initial displacement values ​​and displacement ranges of the three coils according to different working conditions, and predicting the changes in resistance and inductance values ​​of the three coils of the control rod drive system driving mechanism at the next moment; Determine whether the current working condition is static or dynamic, and determine the initial displacement values ​​and displacement ranges of the three coils according to different working conditions, and predict the changes in resistance and inductance values ​​of the three coils of the control rod drive system driving mechanism at the next moment, including: If it is determined according to the control instruction that the current control rod drive system is in a static state, the resistance and inductance values ​​of the three coils at the next moment are directly found in the electromagnetic field two-dimensional data table according to the currents of the three coils and the initial displacement values ​​of the coils at the current moment; If it is determined according to the control instruction that the current control rod drive system belongs to a dynamic working condition, then the electromagnetic lifting force of the three coils at the next moment is directly found in the electromagnetic field two-dimensional data table according to the current of the three coils at the current moment and the initial displacement value of the coils; and the displacement value of the three coils at the next moment is calculated in the electromagnetic force kinematic model according to the electromagnetic lifting force; finally, the resistance and inductance values ​​of the three coils at the next moment are found in the electromagnetic field two-dimensional data table according to the current of the three coils at the current moment and the displacement value of the coils at the next moment; The calculation process of the electromagnetic force kinematic model is: Step A, obtaining the displacement value and electromagnetic force of the control rod drive system at the current moment; Step B, determining whether the displacement value of the control rod drive system at the current moment is greater than or equal to the maximum displacement of the control rod drive system, if so, executing step C; if not, executing step D; Step C, determining whether the electromagnetic force of the control rod drive system at the current moment is greater than or equal to the configuration of the control rod drive system itself, if so, the displacement value at the next moment is equal to the displacement value of the control rod drive system at the current moment; if not, the displacement value at the next moment is equal to 0; and continuing to step F; Step D, judging whether the electromagnetic force of the control rod drive system at the current moment is greater than or equal to the configuration of the control rod drive system itself, if yes, executing step E; if no, the displacement value at the next moment is equal to the displacement value of the control rod drive system at the current moment; Step E, calculating the acceleration of the moving parts of the control rod drive system at the current moment, calculating the speed of the moving parts of the control rod drive system at the current moment according to the acceleration at the current moment, and then calculating the maximum displacement of the control rod drive system at the next moment; judging whether the maximum displacement at the next moment is greater than or equal to the maximum displacement of the control rod drive system, if so, the displacement value at the next moment is equal to the maximum displacement at the next moment; if not, the displacement value at the next moment is equal to the maximum displacement of the control rod drive system; and continuing to step F; Step F, output the displacement value at the next moment.

2. The method for dynamic digital modeling of a reactor control rod drive system according to claim 1, characterized in that: The three coils of the driving mechanism include a lifting coil, a moving coil and a holding coil.

3. The method for dynamic digital modeling of a reactor control rod drive system according to claim 1, characterized in that: Through the combination of theory, simulation and actual operation, a two-dimensional data table of electromagnetic field of control rod drive system is established, including: Constructing an electromagnetic simulation model of the entire control rod drive system, and using the electromagnetic simulation model to simulate the distribution of magnetic flux lines and magnetic field strength of the control rod drive system under different coil current value inputs and different motion displacements; Sorting out all the working conditions that the control rod drive system will experience in the actual working process, and dividing the control rod drive system into different working stages according to the different current sizes of the control rod drive system; Taking different coils as objects, all working conditions that need to be simulated by electromagnetics are determined according to the motion displacement information of different working stages; All the working conditions are simulated in the electromagnetic simulation model to obtain the inductance and resistance values ​​of the lifting coil, the moving coil and the holding coil under all working conditions, and to obtain the electromagnetic force data of the three coils under all conditions.

4. Reactor control rod drive system dynamic digital modeling system, characterized in that: The system includes: An electromagnetic field two-dimensional data table establishing unit is used to establish an electromagnetic field two-dimensional data table of the control rod drive system through a mode combining theory, simulation and actual operation; the input signals of the electromagnetic field two-dimensional data table are the current values ​​and displacement values ​​of the three coils of the drive mechanism, and the output signals of the electromagnetic field two-dimensional data table are the resistance values, inductance values ​​and electromagnetic force values ​​of the three coils of the drive mechanism; A dynamic digital model building unit is used to build a dynamic digital model of the electrical performance of the control rod drive system according to the electromagnetic field two-dimensional data table; the dynamic digital model takes the control command and the actual current measured values ​​of the three coils of the drive mechanism as input, and can predict the changes in the resistance and inductance values ​​of the three coils of the drive mechanism of the control rod drive system at the next moment; The dynamic digital model building unit includes a working stage division subunit and a working condition judgment and prediction subunit; A working phase division subunit is used to divide the working phase of the control rod drive system according to the control command of the current control rod drive system; The working condition judgment and prediction subunit is used to divide the working conditions of the three coils based on different coils, judge whether the current working condition is a static or dynamic working condition, and determine the displacement initial values ​​and displacement ranges of the three coils according to different working conditions, and predict the changes in resistance and inductance values ​​of the three coils of the control rod drive system driving mechanism at the next moment, including: If it is determined according to the control instruction that the current control rod drive system is in a static state, the resistance and inductance values ​​of the three coils at the next moment are directly found in the electromagnetic field two-dimensional data table according to the currents of the three coils and the initial displacement values ​​of the coils at the current moment; If it is determined according to the control instruction that the current control rod drive system belongs to a dynamic working condition, then the electromagnetic lifting force of the three coils at the next moment is directly found in the electromagnetic field two-dimensional data table according to the current of the three coils at the current moment and the initial displacement value of the coils; and the displacement value of the three coils at the next moment is calculated in the electromagnetic force kinematic model according to the electromagnetic lifting force; finally, the resistance and inductance values ​​of the three coils at the next moment are found in the electromagnetic field two-dimensional data table according to the current of the three coils at the current moment and the displacement value of the coils at the next moment; The calculation process of the electromagnetic force kinematic model is: Step A, obtaining the displacement value and electromagnetic force of the control rod drive system at the current moment; Step B, determining whether the displacement value of the control rod drive system at the current moment is greater than or equal to the maximum displacement of the control rod drive system, if so, executing step C; if not, executing step D; Step C, determining whether the electromagnetic force of the control rod drive system at the current moment is greater than or equal to the configuration of the control rod drive system itself, if so, the displacement value at the next moment is equal to the displacement value of the control rod drive system at the current moment; if not, the displacement value at the next moment is equal to 0; and continuing to step F; Step D, judging whether the electromagnetic force of the control rod drive system at the current moment is greater than or equal to the configuration of the control rod drive system itself, if yes, executing step E; if no, the displacement value at the next moment is equal to the displacement value of the control rod drive system at the current moment; Step E, calculating the acceleration of the moving parts of the control rod drive system at the current moment, calculating the speed of the moving parts of the control rod drive system at the current moment according to the acceleration at the current moment, and then calculating the maximum displacement of the control rod drive system at the next moment; judging whether the maximum displacement at the next moment is greater than or equal to the maximum displacement of the control rod drive system, if so, the displacement value at the next moment is equal to the maximum displacement at the next moment; if not, the displacement value at the next moment is equal to the maximum displacement of the control rod drive system; and continuing to step F; Step F, output the displacement value at the next moment.

5. The reactor control rod drive system dynamic digital modeling system according to claim 4, characterized in that: The electromagnetic field two-dimensional data table establishment unit includes an electromagnetic simulation model construction subunit, an actual working stage division subunit, a full working condition determination subunit and a simulation subunit; An electromagnetic simulation model building subunit is used to build an electromagnetic simulation model of the entire control rod drive system, and use the electromagnetic simulation model to simulate the distribution of magnetic flux lines and magnetic field strength of the control rod drive system under different coil current value inputs and different motion displacements; The actual working stage division sub-unit is used to sort out all the working conditions that the control rod drive system will experience during the actual working process, and divide the control rod drive system into different working stages according to the different current sizes of the control rod drive system; The all-operating-condition determination subunit is used to determine all operating conditions that need to be subjected to electromagnetic simulation according to the motion displacement information of different working stages with different coils as objects respectively; The simulation subunit is used to simulate all the working conditions in the electromagnetic simulation model, obtain the inductance and resistance values ​​of the lifting coil, the moving coil and the holding coil under all working conditions, and obtain the electromagnetic force data of the three coils under all conditions.

6. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method for dynamic digital modeling of a reactor control rod drive system according to any one of claims 1 to 3 is implemented.

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