Water level control method and apparatus for steam generator, terminal device, and storage medium

Abstract

The present application is applicable to the technical field of computers, and provides a water level control method and apparatus for a steam generator, a terminal device, and a storage medium. The method comprises: in a low-load condition mode, acquiring a first target parameter of the steam generator and, on the basis of the first target parameter, controlling a first water level of the steam generator; in a high-load condition mode, acquiring a second target parameter of the steam generator and, on the basis of the second target parameter, controlling a second water level of the steam generator; and, in a random fault mode, acquiring a third target parameter of the steam generator and, on the basis of the third target parameter, controlling a third water level of the steam generator, wherein the first target parameter, the second target parameter and the third target parameter are all parameters used for evaluating the water level state of the steam generator. The embodiments of the present application can effectively improve the water level stability of steam generators, thereby improving the operational safety and stability of nuclear power units.

Description

Water level control method and device of steam generator, terminal equipment and storage medium

[0001] Cross-reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202411241154.X, filed September 5, 2024, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present application belongs to the field of computer technology, and particularly relates to a water level control method and device of a steam generator, a terminal equipment and a storage medium. BACKGROUND

[0004] The steam generator is a key device for nuclear power generation of a nuclear power unit, which generates steam using the heat generated by a nuclear reactor, thereby driving a steam turbine generator to generate electricity.

[0005] However, in the current operation of the steam generator, the water level in the steam generator is easily disturbed due to various factors, thereby affecting the safe and stable operation of the nuclear power unit. Therefore, how to improve the water level stability of the steam generator has become a problem that needs to be solved by those skilled in the art. SUMMARY

[0006] Therefore, the embodiments of the present application provide a water level control method and device of a steam generator, a terminal equipment and a storage medium to improve the water level stability of the steam generator.

[0007] A first aspect of the embodiments of the present application provides a water level control method of a steam generator, the water level control method comprising:

[0008] In a low load working condition mode, a first target parameter of the steam generator is obtained, and a first water level control of the steam generator is realized according to the first target parameter;

[0009] In a high load working condition mode, a second target parameter of the steam generator is obtained, and a second water level control of the steam generator is realized according to the second target parameter;

[0010] In a random fault mode, a third target parameter of the steam generator is obtained, and a third water level control of the steam generator is realized according to the third target parameter;

[0011] The first target parameter, the second target parameter and the third target parameter are all parameters for evaluating the water level state of the steam generator.

[0012] The second aspect of the embodiment of the present application provides a water level control device of a steam generator, the water level control device comprising:

[0013] a first control module, configured to acquire a first target parameter of the steam generator in a low load working condition mode, and realize first water level control of the steam generator according to the first target parameter;

[0014] a second control module, configured to acquire a second target parameter of the steam generator in a high load working condition mode, and realize second water level control of the steam generator according to the second target parameter;

[0015] a third control module, configured to acquire a third target parameter of the steam generator in a random fault mode, and realize third water level control of the steam generator according to the third target parameter;

[0016] The first target parameter, the second target parameter and the third target parameter are all parameters for evaluating the water level state of the steam generator.

[0017] The third aspect of the embodiment of the present application provides a terminal device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor realizes the steps of the water level control method according to the first aspect of the embodiment of the present application when executing the computer program.

[0018] The fourth aspect of the embodiment of the present application provides a computer readable storage medium, the computer readable storage medium stores a computer program, and the computer program realizes the steps of the water level control method according to the first aspect of the embodiment of the present application when executed by a processor.

[0019] The water level control method provided by the first aspect of the embodiment of the present application can acquire a first target parameter of a steam generator in a low load working condition mode, realize first water level control of the steam generator according to the first target parameter, acquire a second target parameter of the steam generator in a high load working condition mode, realize second water level control of the steam generator according to the second target parameter, acquire a third target parameter of the steam generator in a random fault mode, and realize third water level control of the steam generator according to the third target parameter, wherein the first target parameter, the second target parameter and the third target parameter are all parameters for evaluating the water level state of the steam generator, so that the water level stability of the steam generator can be effectively improved, and the safety and stability of the operation of a nuclear power unit are improved.

[0020] It can be understood that the beneficial effects of the second aspect to the fourth aspect can be referred to the related description in the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0022] Fig. 1 is a first water level control logic diagram provided by the embodiments of the present application;

[0023] Fig. 2 is a water level control method of a steam generator provided by the embodiments of the present application;

[0024] Fig. 3 is a second water level control logic diagram provided by the embodiments of the present application;

[0025] Fig. 4 is a main feed water valve control diagram provided by the embodiments of the present application;

[0026] Fig. 5 is a third water level control logic diagram provided by the embodiments of the present application;

[0027] Fig. 6 is a structure diagram of a water level control device of a steam generator provided by the embodiments of the present application;

[0028] Fig. 7 is a structure diagram of a terminal device provided by the embodiments of the present application. Embodiments of the present application

[0029] In the following description, specific details are set forth in order to provide a thorough understanding of the embodiments of the present application for purposes of explanation and not limitation. It will be obvious to those skilled in the art that other embodiments can be practiced apart from these specific details. In some instances, detailed descriptions of well-known methods, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0030] It should also be understood that the term "and / or" used in the specification and the appended claims means one or more of the associated listed items as well as all possible combinations of the items.

[0031] In addition, in the description of the specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0032] Reference to "one embodiment" or "some embodiments" or "one implementation" or "some implementations" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. The appearances of the phrase "in one embodiment" or "in some embodiments" or "in one implementation" or "in some implementations" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily referring to some, but not all, embodiments. The terms "including," "comprising," "having," and variations thereof are meant to encompass the items listed thereafter, but do not exclude other items from also being present. The term "consisting of" is meant to exclude any item not specified. The term "consisting essentially of" means the items listed after the term are an exhaustive list of the components of the composition or process, but other items not listed can be present.

[0033] The steam generator is a vertical, natural circulation, saturated steam producing device. The reactor coolant flows inside the heat transfer tubes, transferring heat to the secondary water outside the tubes, which is naturally circulated in the steam generator, and a portion of the water is changed into saturated steam when flowing outside the heat transfer tubes, to supply the main steam turbine, thereby driving the turbine to generate electricity.

[0034] The water level control of the steam generator of a nuclear power unit mainly includes the main feedwater pump rotating speed control and the main feedwater valve opening degree control. The main purpose of the main feedwater pump rotating speed control is to adjust the pressure difference (referred to as the steam-water pressure difference) between the feedwater main pipe and the steam main pipe to be a parabolic change with the load change while maintaining the pressure drop of the regulating valve constant, and the actuator is the main feedwater pump. The main feedwater valve opening degree control refers to setting an independent water level regulating system for each steam generator, changing the valve opening degree of the main feedwater valve to change the feedwater flow to achieve the purpose of controlling the water level, and the actuator is the main feedwater valve (referred to as the main valve) and the bypass feedwater valve (referred to as the bypass valve).

[0035] The water level control logic of the steam generator is shown in FIG. 1. Wherein, represents the steam-water pressure difference, represents the steam flow, represents the steam pressure, represents the feedwater flow, represents the current water level height of the steam generator, represents the two-loop mirror load (wide range), represents the feedwater temperature, represents the two-loop mirror load (narrow range), represents the main valve opening degree signal, Bypass valve opening degree signal. The main feed water valve opening degree control is achieved by adjusting the feed water flow into the steam generator. The normal feed water circuit of each steam generator is provided with two parallel pipelines: the main feed water valve on the main pipeline is used for water level regulation in high load condition mode, and the bypass valve on the bypass pipeline is used in low load condition mode and in the operation mode during start-up and shutdown.

[0036] Therefore, in view of the possible disturbance of the water level of the steam generator in different operation modes, the embodiment of the present application provides a water level control method. In the low load condition mode, a first target parameter of the steam generator is obtained, and a first water level control of the steam generator is realized according to the first target parameter; in the high load condition mode, a second target parameter of the steam generator is obtained, and a second water level control of the steam generator is realized according to the second target parameter; in the random fault mode, a third target parameter of the steam generator is obtained, and a third water level control of the steam generator is realized according to the third target parameter; wherein the first target parameter, the second target parameter and the third target parameter are all parameters for evaluating the water level state of the steam generator. In this way, the water level stability of the steam generator can be effectively improved, and the safety and stability of the nuclear power unit operation can be improved.

[0037] It should be noted that in the present application, the two-loop power is the low load condition, the two-loop power is the high load condition; in the random fault mode, the random fault that occurs accidentally may cause a large amplitude disturbance to the water level of the steam generator, and in severe cases, it may cause the occurrence of transient conditions such as load rejection of the nuclear power unit or unit tripping.

[0038] Embodiment one

[0039] As shown in FIG. 2, the water level control method of the steam generator provided by the embodiment of the present application includes the following steps S1 to S3:

[0040] Step S1, in the low load condition mode, a first target parameter of the steam generator is obtained, and a first water level control of the steam generator is realized according to the first target parameter.

[0041] In application, the first target parameter is a parameter for evaluating the water level state of the steam generator, including but not limited to, steam flow, steam pressure, steam temperature, feed water flow, feed water temperature, feed water quality, feed water pressure, current water level height, etc.

[0042] In application, in the low load condition mode, i.e. in the case of two-loop power , the first target parameter of the steam generator is obtained, including obtaining the current water level height of the steam generator, if the current water level height of the steam generator is less than the first preset water level height, the first water level control of the steam generator is realized by increasing the feed water flow of the steam generator; if the current water level height of the steam generator is greater than the first preset water level height, the first water level control of the steam generator is realized by reducing the feed water flow of the steam generator. Deviation of water level height of steam generator A certain range, i.e. Time, According to the actual demand, the first water level control of the steam generator is needed, so that the current water level height of the steam generator Deviation of water level height of steam generator Does not exceed , to improve the stability of the water level.

[0043] In one embodiment, step S1 specifically comprises:

[0044] In a preset flow range, the steam flow and the feedwater flow of the steam generator are obtained;

[0045] If the steam-water deviation between the steam flow and the feedwater flow exceeds a first deviation threshold, the feedwater flow and / or the steam flow is optimized so that the steam-water deviation does not exceed the first deviation threshold;

[0046] The two-loop mirror load and the one-loop heat power deviation are obtained;

[0047] If the power deviation between the two-loop mirror load and the one-loop heat power deviation exceeds a second deviation threshold, the two-loop mirror load is optimized so that the power deviation does not exceed the second deviation threshold.

[0048] In application, the flow range can be set according to actual demand, for example, in Flow range, the steam flow And the feedwater flow , if the steam-water deviation between the steam flow And the feedwater flow Exceeds a first deviation threshold, i.e. , Indicates the first deviation threshold (the first deviation threshold Is set according to actual demand), the feedwater flow and / or the steam flow needs to be optimized so that the steam-water deviation does not exceed the first deviation threshold.

[0049] In application, considering that when measuring the steam flow And the feedwater flow , the differential pressure measurement principle is used, and the error at zero point is relatively large, therefore, the accuracy range of the output signal of the steam flow At zero point and the output signal of the feedwater flow At zero point can be controlled to ensure the steam flow And the feedwater flow consistency, i.e.:

[0050] ;

[0051] ;

[0052] wherein, represents steam flow , feedwater flow , standard value of output at zero point, represents zero point accuracy control range.

[0053] In application, during the time before the turbine is connected to the grid, the mirror load of the secondary circuit changes greatly and is unstable, the calculation of the mirror load of the secondary circuit deviates greatly from the actual steam load, which causes the bypass valve opening to deviate from the design value, thereby easily causing the water level of the steam generator to fluctuate. Therefore, when the power deviation between the mirror load of the secondary circuit and the thermal power deviation of the primary circuit exceeds the second deviation threshold, by reducing the power deviation between the mirror load of the secondary circuit and the thermal power deviation of the primary circuit, the accuracy of the mirror load of the secondary circuit can be improved, and the water level fluctuation amplitude of the steam generator during grid connection can be effectively reduced. That is, when the power deviation between the mirror load of the secondary circuit and the thermal power deviation of the primary circuit exceeds the second deviation threshold, the mirror load of the secondary circuit needs to be corrected to ensure that the mirror load of the secondary circuit satisfies , , , , , , , , ,

[0054] In one embodiment, step S1 further specifically comprises:

[0055] obtaining the current main / bypass valve switching threshold of the steam generator and the corresponding bypass regulating valve margin;

[0056] If the bypass regulating valve margin is less than a preset regulating margin, the current main / bypass valve switching threshold is corrected so that the bypass regulating valve margin is not less than the preset regulating margin.

[0057] In application, during the operation of the nuclear power unit, the selection of the main / bypass valve switching threshold is crucial to ensure the water level stability of the steam generator. If the water supply capacity of the bypass valve is insufficient when the main / bypass valve is switched, it will directly cause water level fluctuation, which can be specifically manifested as: the feedwater flow decreases under the same valve opening, the bypass valve is close to full opening without regulating margin when the main / bypass valve is switched, etc.

[0058] Therefore, aiming at the problem of insufficient water supply capacity of the bypass regulating valve under the low load working condition mode or the starting stage of the nuclear power unit, the main / bypass valve switching threshold is optimized in the application, so that the bypass valve has good water supply regulating performance at the main / bypass valve switching point. Therefore, the water level stability of the steam generator under the low load working condition mode is improved.

[0059] Specifically, the current main / bypass valve switching threshold of the steam generator and the corresponding bypass regulating valve margin are obtained, and if the bypass regulating valve margin of the steam generator is less than the preset regulating margin at the current main / bypass valve switching threshold (i.e.: , wherein, indicates the regulating margin threshold of the bypass valve of the steam generator at the main / bypass valve switching threshold ), the main / bypass valve switching threshold is corrected, so as to ensure that the bypass regulating valve margin of the steam generator is not less than the preset regulating margin .

[0060] Under the low load working condition mode, the water level stability of the steam generator can be effectively improved by sequentially analyzing and correcting the steam-water deviation of the steam generator, the mirror image load of the secondary circuit, and the accuracy of the main / bypass valve switching threshold.

[0061] Step S2, under the high load working condition mode, obtaining a second target parameter of the steam generator, and realizing second water level control of the steam generator according to the second target parameter.

[0062] In application, the second target parameter is a parameter for evaluating the water level state of the steam generator, including but not limited to steam flow, steam pressure, steam temperature, feedwater flow, feedwater temperature, feedwater quality, feedwater pressure, current water level height and the like.

[0063] In application, under the high load working condition mode, i.e. under the condition that the power of the secondary circuit is , the second target parameter of the steam generator is obtained, including obtaining the maximum value and the minimum value of the water level height of the steam generator, so as to determine the oscillation amplitude, the oscillation frequency and the oscillation period of the water level. By analyzing the cause of oscillation and performing corresponding optimization regulation, the second water level control of the steam generator is realized to improve the stability of the water level.

[0064] In an embodiment, step S2 includes the following steps before step S2:

[0065] Under the high load working condition mode, a fixed sampling period is set;

[0066] Within n fixed sampling periods, obtain n sets of minimum and maximum water level values ​​and corresponding water level deviations of the steam generator;

[0067] Based on the relationship between the water level deviation of each group and the third deviation threshold, it is determined whether the water level of the steam generator oscillates or fluctuates.

[0068] In applications, a fixed sampling period is used. The period of the coupled oscillation can be adjusted. Configure and fix the sampling period. The sampling period cannot be set too short, otherwise it will be impossible to collect the maximum and minimum water level values ​​within one oscillation cycle; a fixed sampling period is required. The sampling period cannot be set too long, otherwise it will not accurately reflect the changes in the water level oscillation amplitude of the steam generator. Therefore, a fixed sampling period is necessary. Satisfy the formula That's all.

[0069] In the application, after setting a fixed sampling period, the minimum and maximum water levels of the steam generator and the corresponding water level deviations are obtained within n fixed sampling periods. Then, based on the relationship between each set of water level deviations and the third deviation threshold, it is determined whether the water level of the steam generator oscillates.

[0070] For example, in the sampling period Inside, obtain the minimum water level of the steam generator. and minimum water level ;like ,but The count is incremented by 1; where This is the intervention value for the water level fluctuation amplitude of the steam generator;

[0071] And so on, during the sampling period Inside, the minimum water level of the steam generator can be obtained. and maximum water level ,like ,but Increment the count by 1;

[0072] During the sampling period Inside, the minimum water level of the steam generator can be obtained. and maximum water level ,like ,but Increment the count by 1;

[0073] exist Within each sampling period, the final count is obtained. ,like , it indicates that the water level of the steam generator appears oscillation fluctuation, and needs to be adjusted to improve the stability of the water level, wherein, represents the proportion threshold of the fluctuation amplitude of the water level of the steam generator exceeding the intervention value.

[0074] In one embodiment, step S2 specifically comprises:

[0075] obtaining the first frequency characteristic and the corresponding first phase difference of the main feedwater pump speed control system, and the second frequency characteristic and the corresponding second phase difference of the main feedwater valve opening control system;

[0076] obtaining the first adjustment parameter of the main feedwater pump speed control system and / or the second adjustment parameter of the main feedwater valve opening control system according to the first frequency characteristic, the first phase difference, the second frequency characteristic and the second phase difference;

[0077] optimizing the first frequency characteristic and / or the second frequency characteristic through the first adjustment parameter and / or the second adjustment parameter, so that the water level of the steam generator remains in a stable state.

[0078] In application, the first frequency characteristic, the first phase difference, the second frequency characteristic and the second phase difference can be obtained by experimental or simulation method.

[0079] In application, the frequency characteristic reflects the response ability of the control system to different frequency signals, and the phase difference reflects the phase difference between the two control systems, i.e. the relative time delay between the control signals. Since there is mutual influence and adverse coupling between the main feedwater pump speed control system and the main feedwater valve opening control system, when the frequency characteristics and phase differences of the two control systems (the main feedwater pump speed control system and the main feedwater valve opening control system) are similar, the interaction between them may cause oscillation amplification, resulting in adjustment resonance phenomenon.

[0080] In application, if it is judged according to the foregoing embodiment that the water level of the steam generator appears oscillation fluctuation, in order to reduce the influence caused by the coupling between the main feedwater pump speed control system and the main feedwater valve opening control system, the first frequency characteristic and the corresponding first phase difference of the main feedwater pump speed control system, and the second frequency characteristic and the corresponding second phase difference of the main feedwater valve opening control system can be obtained, and the first adjustment parameter of the main feedwater pump speed control system is obtained according to the first frequency characteristic, the first phase difference, the second frequency characteristic and the second phase difference, wherein the first adjustment parameter includes a proportional coefficient (used to improve the response speed and stability of the system) and a time integral constant (used to reduce the steady-state error while avoiding oscillation caused by over-integration).

[0081] As shown in FIG. 3, by optimizing the proportional coefficient of the feedwater pump control system And time integral constant The two parameters can reduce the large amplitude oscillation of the actuator and the controlled variable of the two regulation systems in a stable state, thereby improving the stability of the water level control of the steam generator.

[0082] In an embodiment, step S2 further comprises:

[0083] If the water level of the steam generator oscillates, the response characteristic curve of the actuator is obtained;

[0084] According to the response characteristic curve, a characteristic parameter adjustment strategy of the actuator is generated;

[0085] According to the characteristic parameter adjustment strategy, the characteristic parameters of the actuator are adjusted, so that the water level of the steam generator remains in a stable state.

[0086] In application, in the water level control system of the steam generator, the response speed of the actuator (such as the main feed water valve) is also an important reason for the water level regulation fluctuation. There are many factors that affect the response speed of the actuator, for example, the physical structure and mechanical inertia of the actuator may cause the response speed of the actuator to slow down, or there may be a corresponding delay in the transmission process of the signal from the control system to the actuator. Therefore, from the response characteristic curve of the actuator, it is determined whether the water level control has lag and poor follow-up phenomenon, so as to optimize and adjust the corresponding characteristic parameters of the actuator, which is more conducive to the water level of the steam generator to remain in a stable state.

[0087] Specifically, if it is judged according to the foregoing embodiment that the water level of the steam generator oscillates, the response characteristic curve of the actuator is obtained, wherein the response characteristic curve includes but is not limited to small signal response characteristic curve, large signal response characteristic curve, and full stroke time response characteristic curve. According to the response characteristic curve of the actuator, a corresponding characteristic parameter adjustment strategy is generated and the characteristic parameters of the actuator are adjusted, wherein the characteristic parameters include proportional gain, speed gain, and minimum loop gain, so as to realize the response characteristics of the actuator in terms of small signal follow-up, low large signal overshoot, and time response characteristics, which is conducive to improving the stability of the water level control of the steam generator.

[0088] As shown in the main feed water valve control schematic diagram of the steam generator in FIG. 4, in order to improve the working stability of the main feed water valve of the steam generator, the characteristic parameters of the main feed water regulating valve can be adjusted based on the response information and the reference index corresponding to the response information through small signal follow-up setting, large signal overshoot setting, and full stroke time response characteristic setting, to control the working condition of the main feed water valve.

[0089] This application embodiment improves the stability of steam generator water level control under high load conditions from the perspective of the response characteristics of the actuator, thereby effectively enhancing the anti-disturbance capability of steam generator water level control and effectively ensuring the safe and stable operation of nuclear power units.

[0090] In the application, feedwater flow and steam flow are used as feedforward quantities in the control of the main steam generator level valve. To prevent signal fluctuations from causing abnormal regulation, filtering modules are installed for both steam flow and steam generator level processes, but no filtering module is installed for feedwater flow. During actual operation, the steam flow and steam generator level process signals are stable, while the feedwater flow process signal exhibits significant fluctuations, and the actual variation characteristics of the process quantities do not match the logic settings.

[0091] Therefore, the impact of feedforward fluctuations on the control system can also be reduced by adding a filter module to the main feedwater flow rate. The specific water level control logic is shown in Figure 5, where the feedwater flow rate... Steam flow rate Evaporator liquid level (Current water level in the steam generator) and wide range of secondary circuit load measurement Participating in main valve control, wide range of secondary circuit loads Generate a water level setpoint, and compare the water level setpoint with the current water level. After performing the difference calculation, a water level deviation signal is generated based on this difference and input to the water level regulator (PID controller). The output signal of the water level regulator (PID controller) is then calculated by subtracting the steam-water mismatch signal from its output signal and input to the flow regulator (PI controller, Proportion-Integral controller) to control the opening of the main valve. The steam-water mismatch signal is based on the feedwater flow rate. Steam flow rate The difference is determined. Narrow range load on the second circuit. The output signal of the water level regulator (PID controller) participating in bypass valve control has a narrow range and is related to the secondary loop load. After the adder performs the operation, the signal is processed by the P regulator (Proportion regulator) and the opening degree of the bypass valve is controlled.

[0092] Step S3: In random fault mode, obtain the third target parameter of the steam generator, and implement the third water level control of the steam generator according to the third target parameter.

[0093] In applications, the third target parameter is a parameter for evaluating the water level state of the steam generator, including but not limited to, steam flow, steam pressure, steam temperature, feed water flow, feed water temperature, feed water quality, feed water pressure, current water level height and the like.

[0094] In applications, in the random fault mode, the occurrence of faults is accidental, but some faults have a great impact on the water level regulation of the steam generator, and serious ones can cause the occurrence of transient conditions such as load rejection or unit trip of the nuclear power unit, therefore, the steam generator water level stability can also be improved by fault identification and processing.

[0095] In one embodiment, step S3 comprises:

[0096] In the random fault mode, at least one of the steam flow, the feed water flow and the heat balance flow is obtained;

[0097] Based on the constructed cross-validation system, the steam flow, the feed water flow and the heat balance flow are corrected with high accuracy of differential pressure;

[0098] The water level state of the steam generator is determined by using the corrected steam flow, feed water flow and heat balance flow;

[0099] According to the water level state, the third water level control of the steam generator is realized.

[0100] In applications, by deeply analyzing the probability distribution characteristics of random faults, when constructing the cross-validation system, including establishing degradation / failure two-level aging evaluation criteria, formulating evaluation standards based on uncertainty propagation rate-fault probability distribution, forming a cross-validation system including four forms of fusion redundancy measurement comparison, test standard checking, working condition demand matching and historical same period reference.

[0101] In applications, by obtaining at least one of the steam flow, the feed water flow and the heat balance flow in the random fault mode, then based on the constructed cross-validation system, the steam flow, the feed water flow and the heat balance flow are corrected with high accuracy of differential pressure, and the water level state of the steam generator is determined by using the corrected steam flow, feed water flow and heat balance flow, so as to realize the water level control of the steam generator according to the water level state.

[0102] The embodiment of the application establishes a steam generator water level reliability improvement strategy from the fault diagnosis dimension, realizes the timely monitoring of flow measurement deviation anomalies, implements differential pressure high accuracy correction technology on the deviation channel, and improves the accuracy of flow measurement. It is conducive to improving the stability of the steam generator water level control in the random fault mode.

[0103] In one embodiment, step S3 further comprises:

[0104] setting a first default value of the transmitter and a second default value of the controller;

[0105] wherein the first default value comprises a minimum limit value and a maximum limit value of the transmitter output signal, and a minimum limit value and a maximum limit value of the transmitter output signal when a fault is detected; and the second default value comprises a minimum quality bit threshold value and a maximum quality bit threshold value of the controller received signal, and a correction replacement logic adopted when the controller detects a fault of the received signal;

[0106] using the correction replacement logic to correct and replace the received signal when a fault of the received signal is detected, and using the corrected received signal for water level control.

[0107] In applications, in a water level control system of a steam generator, a fault or signal anomaly at the front end of the control system can cause disturbance or transient in the process system, for example, abnormal process quantity without linkage quality bit signal, unreasonable process quantity triggered quality bit signal setting, process quantity fault output and logic action mismatch, etc.

[0108] Therefore, by setting the process quantity default value, the embodiments of the present application realize identification and judgment of process quantity signal faults, and correct and replace the fault value with a default value adapted to the process state, thereby improving the stability of the steam generator water level control under random fault mode.

[0109] In applications, the first default value includes but is not limited to a minimum limit value and a maximum limit value of the transmitter output signal, and a minimum limit value and a maximum limit value of the transmitter output signal when a fault is detected (for distinguishing normal signals and abnormal signals); and the second default value includes but is not limited to a minimum quality bit threshold value and a maximum quality bit threshold value of the controller received signal (for identifying whether the signal is valid), and a correction replacement logic adopted when the controller detects a fault of the received signal (for correcting or replacing the fault value).

[0110] In one embodiment, step S3 further comprises:

[0111] setting a Venturi erosion evaluation standard;

[0112] evaluating the Venturi erosion in a preset time period to obtain a corresponding evaluation result;

[0113] generating a maintenance strategy of the Venturi according to the evaluation result;

[0114] maintaining the Venturi according to the maintenance strategy, and determining a water level state of the steam generator by using a feedwater flow obtained by the maintained Venturi.

[0115] According to the water level state, third water level control of the steam generator is realized.

[0116] In application, the primary feedwater flow once element venturi tube may be eroded under the long-time effect of high-temperature and high-pressure fluid, and even perforated. In order to improve the reliability of the venturi tube and ensure the stability of the steam generator water level control, the embodiments of the application ensure the reliability of the venturi tube by performing corresponding erosion evaluation and taking appropriate maintenance strategy for the venturi tube in time.

[0117] In application, the preset time period can be set according to actual needs, which is not limited here.

[0118] In application, when setting the erosion evaluation standard of the venturi tube, the corresponding erosion evaluation standard can be set according to the type of the flowmeter, which is not limited here.

[0119] In application, when performing erosion evaluation on the venturi tube within the preset time period, the actual differential pressure value of the venturi tube can be compared with the preset differential pressure threshold value to obtain the corresponding evaluation result and maintenance strategy, that is, when the actual differential pressure value is less than the preset differential pressure threshold value, it is prompted that the venturi tube needs to be replaced; when the actual differential pressure value is greater than or equal to the preset differential pressure threshold value, it is prompted that the venturi tube does not need to be replaced.

[0120] In application, the preset differential pressure threshold value can be calculated according to the related parameters of the venturi tube, and the specific calculation formula is:

[0121] ;

[0122] Wherein, do=θd h , d h is the total thickness of the throat steel plate of the venturi tube, θ is the thickness deviation coefficient, C is the outflow coefficient; ε is the expandable coefficient; D is the pipe diameter; d is the throat inner diameter of the venturi tube; ρ is the fluid density, q m is the mass flow.

[0123] In application, if the venturi tube does not need to be replaced, the feedwater flow is obtained by using the current venturi tube, so as to determine the water level state of the steam generator and realize the water level control of the steam generator.

[0124] The embodiments of the application ensure the quality of the venturi tube, thereby ensuring the accuracy of the obtained feedwater flow, and the current water level state can be more accurately obtained, which is beneficial to realize more accurate water level control and effectively improve the safety and stability of the nuclear power unit operation.

[0125] The main feed water flow Venturi tube differential pressure erosion evaluation and replacement scheme provided by the embodiment of the application can dynamically evaluate the erosion degree of the Venturi tube through differential pressure change under the conditions of single cycle erosion and cumulative erosion, and improve the stability of the water level control of the steam generator under the random failure mode from the perspective of reliability of one-time component measurement.

[0126] Under the low load working condition mode, the embodiment of the application optimizes the accuracy of the steam-water deviation, the accuracy of the secondary loop mirror load (narrow range), and the accuracy of the main bypass valve switching threshold, under the high load working condition mode, the embodiment of the application judges the response characteristics of the actuator, judges the coupling between the main feed water pump speed control system and the main feed water valve opening control system, and judges the main feed water process quantity fluctuation, realizes the stability of the water level control of the steam generator, under the random failure mode, the embodiment of the application realizes the stability of the water level control of the steam generator through steam-water flow accurate correction based on multi-form cross-validation, control system process quantity default value setting based on fault isolation function, and main water flow Venturi tube differential pressure erosion evaluation and replacement, effectively improves the safety and stability of the nuclear power unit operation.

[0127] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the application.

[0128] Embodiment two

[0129] The embodiment of the application also provides a water level control device of a steam generator for executing the method steps in the water level control method embodiments. The device can be a virtual appliance in a terminal device, which is run by a processor of the terminal device, or can be the terminal device itself.

[0130] As shown in FIG. 6, the water level control device 100 of the steam generator provided by the embodiment of the application includes a first control module 101, a second control module 102, and a third control module 103.

[0131] The first control module 101 is configured to acquire a first target parameter of the steam generator under a low load working condition mode, and realize first water level control of the steam generator according to the first target parameter.

[0132] The second control module 102 is configured to acquire a second target parameter of the steam generator under a high load working condition mode, and realize second water level control of the steam generator according to the second target parameter.

[0133] The third control module 103 is configured to acquire a third target parameter of the steam generator in the random fault mode, and to realize third water level control of the steam generator according to the third target parameter.

[0134] The first target parameter, the second target parameter and the third target parameter are all parameters for evaluating the water level state of the steam generator.

[0135] In one embodiment, the first control module 101 is further configured to:

[0136] acquire steam flow and feedwater flow of the steam generator in a preset flow range;

[0137] If a steam-water deviation between the steam flow and the feedwater flow exceeds a first deviation threshold, the feedwater flow and / or the steam flow is optimized so that the steam-water deviation does not exceed the first deviation threshold.

[0138] acquire a two-loop mirror load and a one-loop heat power deviation;

[0139] If a power deviation between the two-loop mirror load and the one-loop heat power deviation exceeds a second deviation threshold, the two-loop mirror load is optimized so that the power deviation does not exceed the second deviation threshold.

[0140] In one embodiment, the water level control device 100 further comprises a water level fluctuation judgment module 104 configured to:

[0141] In the high load working condition mode, a fixed sampling period is set;

[0142] In n fixed sampling periods, n sets of water level minimum value and water level maximum value of the steam generator and corresponding water level deviations are acquired;

[0143] According to a relationship between each set of water level deviation and a third deviation threshold, it is determined whether the water level of the steam generator appears oscillatory fluctuation.

[0144] In one embodiment, the second control module 102 is further configured to:

[0145] acquire a first frequency characteristic and a corresponding first phase difference of a main feedwater pump rotating speed control system, and a second frequency characteristic and a corresponding second phase difference of a main feedwater valve opening control system;

[0146] According to the first frequency characteristic, the first phase difference, the second frequency characteristic and the second phase difference, a first adjustment parameter of the main feedwater pump rotating speed control system and / or a second adjustment parameter of the main feedwater valve opening control system are obtained;

[0147] The first frequency characteristic and / or the second frequency characteristic are optimized by the first adjustment parameter and / or the second adjustment parameter, so that the water level of the steam generator is kept in a stable state.

[0148] In one embodiment, the third control module 103 is further configured to:

[0149] In a random fault mode, at least one of the steam flow, the feedwater flow, and the heat balance flow is obtained;

[0150] Based on the constructed cross-validation system, the steam flow, the feedwater flow, and the heat balance flow are corrected with high accuracy of differential pressure;

[0151] The water level state of the steam generator is determined using the corrected steam flow, feedwater flow, and heat balance flow;

[0152] According to the water level state, the third water level control of the steam generator is realized.

[0153] In one embodiment, the third control module 103 is further configured to:

[0154] The first default value of the transmitter and the second default value of the controller are set; the first default value includes the minimum and maximum limits of the transmitter output signal, and the minimum and maximum limits of the transmitter output signal when a fault is detected; the second default value includes the minimum and maximum quality bit thresholds of the controller received signal, and the correction replacement logic taken by the controller when a received signal fault is detected;

[0155] When a received signal fault is detected, the received signal is corrected and replaced using the correction replacement logic, and the corrected received signal is used for water level control.

[0156] In one embodiment, the third control module 103 is further configured to:

[0157] The Venturi erosion evaluation standard is set;

[0158] The Venturi erosion evaluation is performed within a predetermined time period to obtain the corresponding evaluation result;

[0159] The maintenance strategy of the Venturi is generated according to the evaluation result;

[0160] The Venturi is maintained according to the maintenance strategy, and the water level state of the steam generator is determined using the feedwater flow obtained by the maintained Venturi;

[0161] According to the water level state, the third water level control of the steam generator is realized.

[0162] The application further provides another embodiment of the water level control device 100 of the steam generator. In the embodiment, the water level control device 100 of the steam generator comprises a processor, wherein the processor is used for executing the following program modules stored in the memory: a first control module 101, a second control module 102 and a third control module 103. The first control module 101 is used for acquiring a first target parameter of the steam generator in a low load working condition mode, and realizing first water level control of the steam generator according to the first target parameter; the second control module 102 is used for acquiring a second target parameter of the steam generator in a high load working condition mode, and realizing second water level control of the steam generator according to the second target parameter; and the third control module 103 is used for acquiring a third target parameter of the steam generator in a random fault mode, and realizing third water level control of the steam generator according to the third target parameter; wherein the first target parameter, the second target parameter and the third target parameter are all parameters for evaluating the water level state of the steam generator.

[0163] In application, each unit in the above device can be a software program module, or realized by different logical circuits integrated in the processor or independent physical components connected with the processor, or realized by multiple distributed processors.

[0164] Embodiment three

[0165] As shown in FIG. 7, the application further provides a terminal device 200, which comprises at least one processor 201 (only one processor is shown in FIG. 7), a memory 202, a computer program 203 stored in the memory 202 and executable on the at least one processor 201, and the processor 201 realizes the steps in each method embodiment described above when executing the computer program 203.

[0166] In application, the terminal device can comprise, but is not limited to, a processor, a memory, and FIG. 7 is only an example of the terminal device and does not constitute a limitation on the terminal device, and can comprise more or fewer components than those shown in the figure, or combine certain components or different components, for example, human-computer interaction devices, input and output devices, network access devices, etc., and the network access device can comprise a communication module for communication between the terminal device and the user terminal.

[0167] In applications, the processor can be a central processing unit (CPU), and can also be other general-purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc. For example, the processor can be a timing controller (TCON). The general-purpose processor can be a microprocessor or can also be any conventional processor.

[0168] In applications, the memory can be an internal storage unit of the terminal device in some embodiments, for example, a hard disk or a memory of the terminal device. The memory can also be an external storage device of the terminal device in other embodiments, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the terminal device. The memory can also include both the internal storage unit and the external storage device of the terminal device. The memory is used to store an operating system, an application program, a boot loader, data, and other programs, for example, program codes of computer programs, etc. The memory can also be used to temporarily store data that has been output or will be output.

[0169] In applications, the communication module can be set to any device capable of direct or indirect long-distance wired or wireless communication with the user terminal according to actual needs. For example, the communication module can provide a communication solution including a wireless local area network (WLAN) (such as a Wi-Fi network), Bluetooth, Zigbee, a mobile communication network, a global navigation satellite system (GNSS), frequency modulation (FM), near field communication technology (NFC), infrared technology (IR), and the like applied on a network device. The communication module can include an antenna, which can have only one element or an antenna array including multiple elements. The communication module can receive electromagnetic waves through the antenna, frequency modulate and filter the electromagnetic wave signals, and send the processed signals to the processor. The communication module can also receive signals to be sent from the processor, frequency modulate and amplify them, and radiate them as electromagnetic waves through the antenna.

[0170] It should be noted that the information interaction, execution process, and the like between the above devices / modules are based on the same concept as the method embodiments of the present application, and the specific functions and technical effects brought about can be referred to the method embodiments part. Therefore, no further description is given here.

[0171] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional modules is taken as an example for illustration. In actual applications, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. Each functional module in the embodiments can be integrated in one processing module, or each module can exist physically independently, or two or more modules can be integrated in one module. The integrated module can be realized in the form of hardware or in the form of a software functional module. In addition, the specific names of the functional modules are only for the purpose of mutual distinction, and do not limit the protection scope of the present application. The specific working process of the modules in the system can refer to the corresponding process in the foregoing method embodiments, and will not be described here.

[0172] The embodiments of the present application also provide a computer readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps in each of the above method embodiments can be implemented.

[0173] The embodiment of the present application provides a computer program product, when the computer program product runs on a terminal device, so that the terminal device can implement the steps in each method embodiment.

[0174] The integrated module, if implemented in the form of a software function module and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on such understanding, all or part of the processes in the above-embodied methods can be completed by a computer program instructing related hardware, and the computer program can be stored in a computer-readable storage medium. When the processor executes the computer program, the steps of each method embodiment can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or some intermediate forms. The computer-readable medium at least includes any entity or device capable of carrying the computer program code to the terminal device, a recording medium, a computer memory, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. For example, a U disk, a mobile hard disk, a magnetic disk or an optical disk, and the like.

[0175] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0176] Those of ordinary skill in the art can realize that the modules and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0177] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division, and actual implementation can have another division manner, for example, a plurality of modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed each other can be indirect coupling or communication connection through some interfaces, devices or modules, and can be electrical, mechanical or other forms.

[0178] The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed to multiple network modules. Part or all of the modules can be selected as needed to achieve the purpose of the embodiment.

[0179] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A water level control method of a steam generator, wherein, The water level control method comprises: In a low load working condition mode, a first target parameter of the steam generator is acquired, and first water level control of the steam generator is realized according to the first target parameter; In a high load working condition mode, a second target parameter of the steam generator is acquired, and second water level control of the steam generator is realized according to the second target parameter; In a random fault mode, a third target parameter of the steam generator is acquired, and third water level control of the steam generator is realized according to the third target parameter; The first target parameter, the second target parameter and the third target parameter are all parameters for evaluating the water level state of the steam generator.

2. The water level control method according to claim 1, wherein The first target parameter of the steam generator is acquired in the low load working condition mode, and the first water level control of the steam generator is realized according to the first target parameter, comprising: In a preset flow interval, the steam flow and the feedwater flow of the steam generator are acquired; If the steam-water deviation between the steam flow and the feedwater flow exceeds a first deviation threshold, the feedwater flow and / or the steam flow is optimized so that the steam-water deviation does not exceed the first deviation threshold; The two-loop mirror load and the one-loop heat power deviation are acquired; If the power deviation between the two-loop mirror load and the one-loop heat power deviation exceeds a second deviation threshold, the two-loop mirror load is optimized so that the power deviation does not exceed the second deviation threshold.

3. The water level control method as claimed in claim 1, wherein, Before the second target parameter of the steam generator is acquired in the high load working condition mode, and the second water level control of the steam generator is realized according to the second target parameter, comprising: In a high load working condition mode, a fixed sampling period is set; In n fixed sampling periods, n groups of water level minimum value and water level maximum value of the steam generator and corresponding water level deviation are acquired; According to the relationship between each group of water level deviation and a third deviation threshold, whether the water level of the steam generator oscillates is determined.

4. The water level control method as claimed in claim 3, wherein, The second target parameter of the steam generator is acquired in the high load working condition mode, and the second water level control of the steam generator is realized according to the second target parameter, comprising: The first frequency characteristic and the corresponding first phase difference of the main feedwater pump speed control system, and the second frequency characteristic and the corresponding second phase difference of the main feedwater valve opening control system are acquired; According to the first frequency characteristic, the first phase difference, the second frequency characteristic and the second phase difference, the first adjustment parameter of the main feedwater pump speed control system and / or the second adjustment parameter of the main feedwater valve opening control system are obtained; The first frequency characteristic and / or the second frequency characteristic are optimized through the first adjustment parameter and / or the second adjustment parameter, so that the water level of the steam generator remains in a stable state.

5. The water level control method as claimed in claim 1, wherein, In the random fault mode, at least one of the steam flow, the feedwater flow and the heat balance flow is acquired, and the third water level control of the steam generator is realized according to the third target parameter. ​ Based on the constructed cross-validation system, the steam flow, the feedwater flow and the heat balance flow are corrected with high accuracy by differential pressure; The water level state of the steam generator is determined by using the corrected steam flow, the feedwater flow and the heat balance flow; According to the water level state, the third water level control of the steam generator is realized.

6. The water level control method as claimed in claim 5, wherein, In the random fault mode, the third target parameter of the steam generator is obtained, and the third water level control of the steam generator is realized according to the third target parameter, which further comprises: Setting the first default value of the transmitter and the second default value of the controller; the first default value includes the minimum and maximum limits of the transmitter output signal, and the minimum and maximum limits of the transmitter output signal when detecting a fault; the second default value includes the minimum and maximum quality bit thresholds of the controller receiving signal, and the correction replacement logic adopted when the controller detects a receiving signal fault; When detecting a receiving signal fault, the receiving signal is corrected and replaced using the correction replacement logic, and the corrected receiving signal is used for water level control.

7. The water level control method as claimed in claim 6, wherein, In the random fault mode, the third target parameter of the steam generator is obtained, and the third water level control of the steam generator is realized according to the third target parameter, which further comprises: Setting the Venturi erosion evaluation standard; Erosion evaluation of the Venturi tube is carried out within a predetermined time period to obtain the corresponding evaluation result; According to the evaluation result, the maintenance strategy of the Venturi tube is generated; According to the maintenance strategy, the Venturi tube is maintained, and the water level state of the steam generator is determined by using the feedwater flow obtained by the maintained Venturi tube; According to the water level state, the third water level control of the steam generator is realized.

8. A water level control apparatus for a steam generator, wherein, The water level control device comprises: A first control module is used to obtain the first target parameter of the steam generator in the low load working condition mode, and realize the first water level control of the steam generator according to the first target parameter; A second control module is used to obtain the second target parameter of the steam generator in the high load working condition mode, and realize the second water level control of the steam generator according to the second target parameter; A third control module is used to obtain the third target parameter of the steam generator in the random fault mode, and realize the third water level control of the steam generator according to the third target parameter; The first target parameter, the second target parameter and the third target parameter are all parameters for evaluating the water level state of the steam generator.

9. The water level control apparatus of a steam generator according to claim 8, wherein The first control module is also used to obtain the steam flow and the feedwater flow of the steam generator in a predetermined flow interval; If the steam-water deviation between the steam flow and the feedwater flow exceeds the first deviation threshold, the feedwater flow and / or the steam flow are optimized so that the steam-water deviation does not exceed the first deviation threshold; The two-loop mirror load and the one-loop heat power deviation are obtained; If a power deviation between the two-loop mirror load and the one-loop thermal power deviation exceeds a second deviation threshold, the two-loop mirror load is optimized so that the power deviation does not exceed the second deviation threshold.

10. The water level control apparatus of a steam generator according to claim 8, wherein The water level fluctuation judgment module is further configured to set a fixed sampling period in the high-load working condition mode; Within n fixed sampling periods, n groups of minimum and maximum water levels of the steam generator and corresponding water level deviations are obtained; According to the relationship between each group of water level deviations and a third deviation threshold, it is determined whether the water level of the steam generator is oscillating.

11. The water level control apparatus of a steam generator according to claim 10, wherein The second control module is further configured to obtain a first frequency characteristic and a corresponding first phase difference of a main feed water pump speed control system, and a second frequency characteristic and a corresponding second phase difference of a main feed water valve opening control system; According to the first frequency characteristic, the first phase difference, the second frequency characteristic, and the second phase difference, a first adjustment parameter of the main feed water pump speed control system and / or a second adjustment parameter of the main feed water valve opening control system are obtained; By the first adjustment parameter and / or the second adjustment parameter, the first frequency characteristic and / or the second frequency characteristic are optimized so that the water level of the steam generator remains in a stable state.

12. The water level control apparatus of a steam generator according to claim 8, wherein The third control module is further configured to obtain at least one of a steam flow, a feed water flow, and a heat balance flow in a random fault mode; Based on the constructed cross-validation system, the steam flow, the feed water flow, and the heat balance flow are corrected with high accuracy of differential pressure; The water level state of the steam generator is determined by using the corrected steam flow, the feed water flow, and the heat balance flow; According to the water level state, a third water level control of the steam generator is realized.

13. The water level control apparatus of a steam generator according to claim 12, wherein The third control module is further configured to set a first default value of a transmitter and a second default value of a controller; the first default value includes a minimum limit value and a maximum limit value of a transmitter output signal, and a minimum limit value and a maximum limit value of a transmitter output signal when a fault is detected; the second default value includes a minimum quality bit threshold and a maximum quality bit threshold of a controller received signal, and a correction replacement logic adopted when a controller detects a received signal fault; When a received signal fault is detected, the received signal is corrected and replaced using the correction replacement logic, and the corrected received signal is used for water level control; and The third control module is further configured to set a Venturi erosion evaluation standard; The Venturi erosion evaluation is performed within a preset time period to obtain a corresponding evaluation result; A maintenance strategy of the Venturi is generated according to the evaluation result; According to the maintenance strategy, the Venturi is maintained, and the water level state of the steam generator is determined by using the feed water flow obtained by the maintained Venturi; According to the water level state, a third water level control of the steam generator is realized.

14. A terminal device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein, The processor executes the computer program to realize the steps of the water level control method according to any one of claims 1 to 7.

15. A computer-readable storage medium storing a computer program, wherein, The computer program is executed by the processor to realize the steps of the water level control method according to any one of claims 1 to 7.

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