A method, system, and device for controlling the water level of a steam generator based on digital twins.

Abstract

This invention discloses a method, system, and device for controlling the water level of a steam generator based on digital twin technology. The method acquires real-time detection information from sensors and outputs the actual measured water level to a water level regulator to obtain the feedwater flow rate adjustment amount. The detection information is then analyzed using a real-time online thermal balance model to obtain the analysis result. This analysis result, along with the feedwater flow rate adjustment amount, is output to a first flow regulator, which in turn outputs a corresponding control command to the feedwater regulating valve to adjust the feedwater flow rate. This control method, utilizing digital twin technology and numerical simulation technology, improves the water level control process to achieve accurate regulation, thereby enhancing the operational reliability, equipment safety, ease of operation, and operational efficiency of the nuclear power plant steam generator.

Description

Technical Field

[0001] This invention relates to the field of nuclear power technology, and in particular to a method, system and device for controlling the water level of a steam generator based on digital twins. Background Technology

[0002] The steam generator is a key device in the pressurized water reactor nuclear power steam supply system that connects the primary steam supply loop (hereinafter referred to as the primary side or primary loop) and the secondary steam supply loop (hereinafter referred to as the secondary side or secondary loop). It plays an important role in heat and mass transfer. The coolant from the reactor core transfers heat to the working fluid in the secondary loop through heat transfer tubes and generates steam.

[0003] The water level control of the steam generator largely determines the safe, reliable, and economical operation of a nuclear power plant unit. If the water level is too high, it will affect the steam-water separation effect, causing steam quality deterioration, exacerbating turbine erosion, affecting turbine lifespan, and even damaging the unit. Excessive water loading will also increase the mass of water in the steam generator, leading to excessive cooling of the reactor core in the event of a steam pipe rupture, potentially causing a reactive accident. If the water level is too low, the top of the heat transfer tubes may be exposed above the water surface. Fluctuations in this area will cause thermal stress fatigue due to alternating wet and dry conditions in the heat transfer tube bundle. Too low a water level may also lead to the emptying of feedwater lines, subsequently triggering water hammer. Therefore, during the operation of a nuclear power plant, the steam generator water level must be maintained within a certain range.

[0004] The function of the steam generator water level control system is: (1) to maintain the balance between feedwater flow and steam flow under stable operating conditions, so that the water level of the steam generator is within the specified range; (2) to keep the water level of the steam generator within the specified limit under transient operating conditions.

[0005] The working fluid on the secondary side of the steam generator undergoes single-phase heat transfer, subcooled boiling heat transfer, and two-phase boiling heat transfer within the generator. The descending channel is a single-phase fluid, while the ascending channel in the secondary tube bundle region is a two-phase mixture. Density wave oscillation exists in the secondary side natural circulation loop, causing the two-phase fluid flow and water level to oscillate continuously with fluctuations in operating conditions, exhibiting a "contraction and expansion" phenomenon. This phenomenon is also known as non-minimum phase dynamics, meaning that when the equipment's operating conditions change, the water level exhibits an instantaneous "reverse dynamic response," resulting in a "false water level." This is mainly manifested as follows: when the feedwater flow rate experiences a positive step change, the steam generator water level initially shows a downward trend, followed by a slow rise after a certain lag. This initial drop in water level is called the "false water level," and its amplitude depends on the magnitude of the disturbance. The lag time depends on the subcooling of the feedwater; the lower the feedwater temperature, the greater the lag time. Conversely, when the feedwater flow rate experiences a negative step change, the water level change shows the opposite trend. When the steam flow rate experiences a positive step change, the secondary side pressure decreases, causing the two-phase mixture in the rising channel of the tube bundle to expand. This increases the flow resistance of the two phases and reduces the flow rate in the falling channel, resulting in a rise in the secondary side water level and a false water level phenomenon. After the water level reaches a certain peak, it then decreases with increasing steam load. This abnormal phenomenon, where the water level rises significantly for a certain period after a load step increase, is also a type of "false water level" phenomenon. When the steam flow rate experiences a negative step change, the water level characteristics exhibit the opposite pattern.

[0006] The steam generator water level control system is a complex system characterized by multiple variables, strong coupling, nonlinearity, time-varying behavior, and large time lag. Changes in reactor power, steam flow rate, feedwater temperature, and flow rate all affect the water level on the secondary side of the steam generator. Therefore, the fundamental task of the feedwater level controller is to compensate for water level changes caused by other factors by altering the feedwater flow rate, thereby keeping the secondary side water level within the target range. The long time lag and the contraction-expansion effect mean that the feedwater controller must predict the impact of power plant state changes or control actions on the steam generator water level and provide a compensatory response before the final impact of these changes or control actions is reflected in the measured water level.

[0007] Each of the parallel feedwater lines to the steam generator is equipped with a valve; a "low flow" or "bypass" valve is used for start-up and flow regulation under low power conditions, and remains fully open under high power conditions. A "high flow" or "main valve" is used for flow regulation under conditions of approximately 20% or more thermal power.

[0008] Existing steam generator level control systems employ a three-impulse level regulation method, using the level signal as the primary input, steam flow as a supplementary signal, and feedwater flow as a negative feedback signal. This method manually or automatically adjusts the feedwater flow control valve opening by continuously comparing the feedwater flow, level, and steam flow signals. Due to the phase difference and time lag between the steam flow or feedwater flow input signal and its corresponding level output signal, feedwater-level control becomes exceptionally complex. This is particularly severe on low-power platforms, with nuclear power plants experiencing numerous reactor trips and shutdowns caused by uncontrolled steam generator levels, resulting in significant economic losses.

[0009] Therefore, the existing steam generators in nuclear power plants have insufficient accuracy in water level regulation under low-power conditions. Summary of the Invention

[0010] This invention provides a method, system, and device for controlling the water level of a steam generator based on digital twins, aiming to solve the problem of insufficient accuracy in water level regulation of existing steam generators in low-power operating conditions in nuclear power plants.

[0011] In a first aspect, embodiments of the present invention provide a steam generator water level control method based on digital twins. The control method is applied in a steam generator water level control system. The intelligent controller of the steam generator water level control system is communicatively connected to sensors, a first flow regulator, and a water level regulator installed in the steam generator. The first flow regulator establishes a communicative connection with a feedwater regulating valve. The control method includes:

[0012] The intelligent controller acquires the detection information obtained by the sensor in real time.

[0013] The intelligent controller outputs the actual measured water level from the detection information to the water level regulator to obtain the corresponding water supply flow rate regulation output by the water level regulator.

[0014] The intelligent controller analyzes the primary-side and secondary-side detection data in the detection information according to a preset real-time online thermal balance model to obtain corresponding analysis results. The primary-side detection data is the detection data corresponding to the primary steam supply circuit side in the detection information, and the secondary-side detection data is the detection data corresponding to the secondary steam supply circuit side in the detection information. The analysis results include calculated values ​​of feedwater flow rate and steam flow rate.

[0015] The intelligent controller outputs the analysis result and the water supply flow rate adjustment to the first flow regulator;

[0016] The first flow regulator outputs a control command to the water supply regulating valve to regulate the water supply flow.

[0017] Secondly, embodiments of this application also provide a steam generator water level control system based on digital twins, wherein the steam generator water level control system is used to execute the steam generator water level control method based on digital twins as described in the first aspect above. The steam generator water level control system includes a detection information acquisition unit, a first information output unit, a judgment unit, an analysis result acquisition unit, a second information output unit, a simulation calculation result acquisition unit, a third information output unit, and a control command output unit configured in a first flow regulator;

[0018] The detection information acquisition unit is used to acquire the detection information obtained by the sensor in real time;

[0019] The first information output unit is used to output the actual measured water level in the detection information to the water level regulator in order to obtain the water supply flow rate regulation amount output by the water level regulator.

[0020] The analysis result acquisition unit is used to analyze the primary-side detection data and secondary-side detection data in the detection information according to a preset real-time online heat balance model to obtain the corresponding analysis results; the primary-side detection data is the detection data corresponding to the primary steam supply circuit side in the detection information, and the secondary-side detection data is the detection data corresponding to the secondary steam supply circuit side in the detection information; the analysis results include the calculated value of feedwater flow rate and the calculated value of steam flow rate;

[0021] The second information output unit is used to output the analysis result and the water supply flow rate adjustment amount to the first flow regulator;

[0022] The control command output unit is used to output control commands to the water supply regulating valve to regulate the water supply flow.

[0023] Thirdly, this application embodiment also provides a steam generator water level control device based on digital twin, the steam generator water level control device including intelligent controller, sensor, first flow regulator, water level regulator, feedwater regulating valve, second flow regulator and feedwater pump speed regulator;

[0024] One end of the feedwater header is connected to the output port of the first feedwater pump, and the other end is connected to the feedwater input port of at least one steam generator; the feedwater regulating valves are connected in series in the feedwater header on the side near the feedwater input port; each of the steam generators is connected to a steam turbine through the steam header;

[0025] The sensors include a differential pressure sensor, a steam pressure sensor, a main pipe pressure sensor, a water supply sensor, a water supply flow sensor, an outlet water sensor, and a steam flow sensor.

[0026] The two detection terminals of the differential pressure sensor are respectively connected to the two pressure detection ports of the steam generator, and the signal output terminal of the differential pressure sensor is connected to the intelligent controller; the detection terminal of the steam pressure sensor is connected to the steam header, and the signal output terminal of the steam pressure sensor is connected to the intelligent controller; the detection terminal of the header pressure sensor is connected to the water supply header, and the signal output terminal of the header pressure sensor is connected to the intelligent controller.

[0027] The detection end of the water supply sensor is connected to the water supply pipe of the steam generator, and the signal output end of the water supply sensor is connected to the intelligent controller; the detection end of the outlet water sensor is connected to the drain pipe of the steam generator, and the signal output end of the outlet water sensor is connected to the intelligent controller; the detection end of the steam flow sensor is connected to the steam header, and the signal output end of the steam flow sensor is connected to the intelligent controller; the detection end of the water supply flow sensor is connected to the water supply header and the connection point is located upstream of the water supply regulating valve, and the signal output end of the water supply flow sensor is connected to the intelligent controller.

[0028] The intelligent controller establishes communication connections with each sensor, the first flow regulator, the water level regulator, and the second flow regulator. The first flow regulator establishes a communication connection with the water supply regulating valve, and the second flow regulator establishes a communication connection with the water supply pump speed regulator.

[0029] The intelligent controller includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

[0030] Memory, used to store computer programs;

[0031] When the processor executes a program stored in memory, it implements the digital twin-based steam generator water level control method as described in the first aspect above.

[0032] Fourthly, embodiments of this application also provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the digital twin-based steam generator water level control method as described in the first aspect.

[0033] This invention provides a method, system, and device for steam generator water level control based on digital twin technology. The method acquires real-time detection information from sensors and outputs the actual measured water level to a water level regulator to obtain the feedwater flow rate adjustment amount. The detection information is then analyzed using a real-time online thermal balance model to obtain the analysis result. This analysis result, along with the feedwater flow rate adjustment amount, is output to a first flow regulator, which in turn outputs a control command to the feedwater regulating valve to adjust the feedwater flow rate. This control method, utilizing digital twin technology and numerical simulation technology, improves the water level control process of the steam generator to achieve accurate regulation, thereby further improving the operational reliability, equipment safety, operational convenience, and unit operating efficiency of the nuclear power plant steam generator. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A diagram illustrating the application effect of water level control in an existing steam generator design.

[0036] Figure 2 A flowchart illustrating the method for controlling the water level of a steam generator based on digital twins, as provided in an embodiment of the present invention.

[0037] Figure 3 A schematic block diagram of a steam generator water level control system based on digital twin provided in an embodiment of the present invention;

[0038] Figure 4 An application effect diagram of the steam generator water level control device based on digital twin provided in an embodiment of the present invention;

[0039] Figure 5 Another application effect diagram of the steam generator water level control device based on digital twin provided in the embodiment of the present invention;

[0040] Figure 6 A schematic block diagram of a computer device provided for an embodiment of the present invention.

[0041] Figure labeling: S, intelligent controller; R2, first flow regulator; R1, water level regulator; V1, feedwater regulating valve; R3, second flow regulator; V2, feedwater pump speed regulator; N, differential pressure sensor; P1, steam pressure sensor; P2, main pipe pressure sensor; Qs, feedwater sensor; Qa, feedwater flow sensor; Qw, outlet water sensor; Qv, steam flow sensor; B1, first feedwater pump. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0044] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0045] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0046] Please see Figure 1 , Figure 1 This diagram illustrates the application effect of water level control in a steam generator using existing technology. It includes two parts: water level regulation and feedwater pump speed regulation. The actual water level of the steam generator is measured by differential pressure sensor N and input to the water level regulator R1 along with the water level setpoint. The output signal of R1 represents the feedwater flow rate adjustment to eliminate the deviation between the actual water level and the setpoint. The steam flow rate and feedwater flow rate are respectively controlled by steam flow sensor Q. v and water flow sensor Q aThe measured difference (i.e., the steam-water mismatch signal) is used as a feedforward signal and input together with the output of the water level regulator R1 to the first flow regulator R2. The purpose of including the feedforward signal in the first flow regulator R2 is to accelerate the regulation speed, because the imbalance between steam flow and feedwater flow will cause water level changes. The output of the first flow regulator R2 corresponds to the change in the opening of the feedwater valve required by the above-mentioned flow regulator, and is sent to the feedwater regulating valve V1 to activate it, thereby changing the feedwater flow.

[0047] However, changes in feedwater flow rate will cause changes in the feedwater pump outlet head, which affects the feedwater flow to the two parallel steam generators, and consequently their water levels. Furthermore, to ensure the regulating characteristics of feedwater valve V1, the valve opening should be maintained at a moderate position, requiring a constant pressure difference across the valve. In actual nuclear power plant operation, when the pressure difference ΔP between the feedwater header and the steam header changes according to a certain function of the secondary loop load, the pressure difference across the regulating valve can be kept constant. Therefore, the pressure difference setpoint ΔP0 between the feedwater header and the steam header, calculated from the total steam flow rate, is compared with the measured value ΔP to obtain a comparison signal, which is output to the second flow regulator R3. The second flow regulator R3 outputs a signal to the feedwater pump speed regulator V2 according to the magnitude and direction of the deviation of the comparison signal, changing the feedwater pump speed to keep the pressure difference across the feedwater pump speed regulator V2 constant.

[0048] Existing technology 1 uses water level and steam flow rate Q v and water supply flow rate Q a The three-impulse water level regulation method uses the water level signal as the primary regulation input signal, steam flow rate as a supplementary signal, and feedwater flow rate as negative feedback. Existing water level regulation systems employ PID controllers, which are cascade feedforward control systems, requiring high accuracy in measurement values.

[0049] Under high-power conditions with a power output greater than 30%, the steam and feedwater flow rates are large. The measurement accuracy is high through the Venturi tube flow transmitter on the main feedwater pipeline and the differential pressure flow transmitter on the steam pipeline. By continuously comparing the feedwater flow signal, liquid level signal, and steam flow signal, the opening of the main valve can be accurately regulated, and the steam generator has good water level regulation performance.

[0050] However, existing technologies exhibit poor water level regulation performance under low-power conditions. During low-power operation (less than 30% of capacity), the steam and feedwater flow rates are low, resulting in large measurement deviations in the steam and feedwater flow transmitters. At even lower flow rates, the steam and feedwater flow measurement signals become unusable, significantly impacting the control system. Under low-power conditions, existing technologies rely on manual operation by nuclear power plant personnel, who manually adjust the opening of the bypass valve to regulate the water level.

[0051] Under low-power conditions, the secondary natural circulation loop of the steam generator exhibits more pronounced density wave instability. The phase difference between the flow rate at the bottom of the descending channel and the flow rate at the outlet of the ascending channel exceeds 180°. Water levels become unstable with fluctuations in operating conditions, making water level control difficult. The "contraction and expansion" phenomenon makes it challenging for operators to judge the impact of feedwater valve actions on water level changes. This often leads to the supply of excessive feedwater to the feedwater valves when it is not needed, causing the water level to exceed the maximum water level line, or insufficient feedwater to be supplied in time when it is needed, resulting in an excessively low water level line. Dozens of reactor trips and shutdowns caused by uncontrolled water levels have occurred in nuclear power plants, resulting in significant economic losses.

[0052] In summary, the existing steam generator water level control system has the following shortcomings: (1) Under low power conditions, due to the low steam and feedwater flow rates, the measurement deviation of the steam and feedwater flow transmitters is large. At even lower flow rates, the steam and feedwater flow measurement signals are unusable, resulting in poor water level regulation performance. It relies on the nuclear power plant operators to perform "manual operation," which requires high experience and skill from the operators. (2) At low power levels, water level control is difficult. Operators control the feedwater flow rate based on false water levels and experience. False water levels can easily interfere with the operators' judgment and cause misoperation, making it difficult to adjust the steam generator water level to a safe range in a timely and accurate manner. (3) The existing system only generates an alarm signal after the water level has deviated from the normal threshold or lost control, and the alarm signal cannot provide the operator with a corresponding indication response. (4) When the sensors in the nuclear power plant steam generator water level control system malfunction, they will affect the water level control signal, thereby affecting the safe operation of the nuclear power plant.

[0053] Please see Figure 2 As shown in the figure, this application discloses a steam generator water level control method based on digital twins. Please refer to the application effect diagram in Figure 4. This steam generator water level control method is based on... Figure 4 The pipeline structure shown realizes the corresponding water level control function; specifically, the method is applied to the water level control system of the steam generator, and the method is executed by the application software installed in the water level control system of the steam generator; the intelligent controller communicates with each sensor in the steam generator, the first flow regulator and the water level regulator, and the first flow regulator establishes a communication connection with the feedwater regulating valve. Figure 4The pipeline structure shown can simultaneously connect to multiple steam generators, with each steam generator connected to both a steam header and a feedwater header. The steam generators are designated SG1, SG2, and SG3, respectively. The intelligent controller is a processor used to issue control commands to control each component, such as a programmable logic controller (PLC) or other terminal devices like laptops, desktop computers, tablets, or mobile phones. The above control method is primarily based on controlling the water level of a single steam generator; in practical applications, the control method can simultaneously control the water levels of multiple steam generators.

[0054] like Figure 1 As shown, the method includes steps S101 to S105.

[0055] S101, The intelligent controller acquires the detection information obtained by the sensor in real time.

[0056] The intelligent controller acquires the detection information obtained by the sensors in real time. The sensors detect the pipelines connected to the steam generator, thereby obtaining corresponding detection information and sending it to the intelligent controller, which then receives the detection information.

[0057] S102. The intelligent controller outputs the actual measured water level from the detection information to the water level regulator to obtain the corresponding water supply flow regulation amount output by the water level regulator.

[0058] The intelligent controller outputs the actual measured water level from the detection information to the water level regulator to obtain the corresponding water supply flow regulation amount output by the water level regulator. The actual measured water level is measured by a differential pressure sensor and is input to the water level regulator along with a preset water level setpoint. The water level regulator then outputs the corresponding water supply flow regulation amount based on the actual measured water level and the water level setpoint. This water supply flow regulation amount represents the value corresponding to eliminating the deviation between the actual measured water level and the set water level.

[0059] In a more specific embodiment, step S102 specifically includes the following steps: the intelligent controller outputs the actual measured water level in the detection information to the water level regulator; the water level regulator compares the actual measured water level with the set water level setting value, obtains the corresponding water supply flow rate adjustment amount, and outputs it to the intelligent controller.

[0060] Specifically, the intelligent controller outputs the actual measured water level from the detection information to the water level regulator. The water level regulator compares the actual measured water level with the set water level setting value to obtain the water supply flow rate adjustment amount and outputs it to the intelligent controller.

[0061] S103. The intelligent controller analyzes the primary and secondary detection data in the detection information according to the preset real-time online thermal balance model to obtain the corresponding analysis results.

[0062] The intelligent controller analyzes the primary-side and secondary-side detection data in the detection information according to a preset real-time online thermal balance model to obtain corresponding analysis results. The detection information includes primary-side detection data (corresponding to the first loop) and secondary-side detection data (corresponding to the second loop); the primary-side detection data is the detection data corresponding to the primary steam supply loop side in the detection information, and the secondary-side detection data is the detection data corresponding to the secondary steam supply loop side in the detection information; the analysis results include calculated feedwater flow rate and calculated steam flow rate.

[0063] In a more specific embodiment, step S103 specifically includes the following steps: constructing a first relationship between the heat exchange power of the steam generator and the steam flow rate and the feedwater flow rate based on the real-time linear heat balance model; constructing a second relationship between the steam flow rate and the feedwater flow rate based on the water supply and drainage balance relationship; substituting the known quantities in the primary side detection data and the secondary side detection data into the first relationship and the second relationship for analysis to obtain the corresponding analysis results.

[0064] Specifically, the real-time linear thermal balance model includes Q=C p W×(T hot -T cold )and Where Q is the heat exchange power of the steam generator, and C p Where W is the volumetric specific heat capacity, W is the primary coolant flow rate, and T is the volumetric specific heat capacity. hot and T cold These represent the inlet and outlet coolant temperatures on the primary side, respectively. Q2 is the heat exchange power between the primary and secondary sides in the steam generator. A S Where K is the heat transfer area, K is the overall heat transfer coefficient, and T is the heat transfer area. sat This is the saturation temperature.

[0065] The heat exchange power Q of the steam generator is related to the flow rate, pressure, and temperature of the inlet and outlet pipes on the primary side by the following formula: Q = C p W×(T hot -T cold C p... hot and T cold These are the primary side inlet and outlet coolant temperatures, respectively, measured in real-time online by measuring instruments. In other words, the detection information includes T. hot and T cold The specific value.

[0066] The heat exchange power Q2 and the heat exchange area A of the heat transfer tubes on the primary and secondary sides of the steam generator S The primary and secondary temperatures also have the following relationship: Where K is the overall heat transfer coefficient, T sat This is the saturation temperature, and its value can be obtained according to the International Standard IAPWS-IF97 for the thermodynamic properties of water and water vapor.

[0067] The formula for calculating the overall heat transfer coefficient is as follows: h p U is the primary heat transfer coefficient. t U is the thermal conductivity of the heat transfer tube. f h is the fouling heat transfer coefficient. s The heat transfer coefficient is denoted as . The primary side inside the heat transfer tube is a single-phase fluid forced convection heat transfer, while the secondary side heat transfer outside the heat transfer tube can be considered as large-space boiling heat transfer. The Dittus-Boelter formula and its modified formula and the Rohsenow large-space boiling heat transfer formula are used for calculation.

[0068] Furthermore, the first relation is Q = W s ((1-x)H s +xH l )+W p H l -W f H f W s W represents the steam flow rate. p W is the secondary side sewage discharge flow rate. f For water supply flow rate, H s Enthalpy of saturated vapor, H l Enthalpy of saturated water, H f The enthalpy of the feedwater, where x is the percentage of humidity in the steam; the second relationship is W. f =W s +W p .

[0069] Based on the heat balance model, the water supply flow rate W can be calculated. f The corresponding calculated water supply flow rate and steam flow rate W s The corresponding calculated steam flow rate provides the necessary input parameters for the water level control system.

[0070] S104. The intelligent controller outputs the analysis result and the water supply flow rate adjustment amount to the first flow regulator.

[0071] If the operating conditions are met, the intelligent controller outputs the analysis result and the water supply flow rate adjustment to the first flow regulator.

[0072] In a more specific embodiment, the following steps are included before step S104: the intelligent controller determines whether the reactor power in the detection information meets the preset operating conditions; if the operating conditions are met, the intelligent controller executes the step of outputting the analysis result and the feedwater flow rate adjustment amount to the first flow regulator; if the operating conditions are not met, the intelligent controller performs simulation calculations on the detection information according to a preset simulation model to obtain corresponding simulation calculation results; the simulation calculation results include the water level change trend and the water level change amplitude range; the intelligent controller outputs the simulation calculation results and the feedwater flow rate adjustment amount to the first flow regulator, so that the first flow regulator outputs corresponding control commands to the feedwater regulating valve to adjust the feedwater flow rate.

[0073] If the operating conditions are met, proceed to step S140.

[0074] The intelligent controller determines whether the reactor power in the detection information meets the preset operating conditions. The intelligent controller obtains the reactor power from the detection information and determines whether the reactor power meets the operating conditions.

[0075] In a more specific embodiment, determining whether the reactor power in the detection information meets the preset operating conditions specifically includes the following steps: determining whether the reactor power in the detection information is in a high-power condition; determining whether the reactor power in the detection information is in a stable operating condition; if the reactor power is in a high-power condition and is in a stable operating condition, determining that the operating conditions are met; if the reactor power is not in a high-power condition or is not in a stable operating condition, determining that the operating conditions are not met.

[0076] Specifically, reactor power can be obtained from the detection information to determine whether the reactor power is in a high-power condition. A high-power condition corresponds to a power of not less than 30% of Pn, where Pn is the reactor's full power. If the reactor power is not less than 30% of Pn, it is determined to be in a high-power condition; if the reactor power is less than 30% of Pn, it is determined not to be in a high-power condition. Further, it is determined whether the reactor power is in a stable operating condition. A stable operating condition corresponds to a power change of not more than 10% FP / min, where 10% FP / min is a power increase or decrease of 5% of full power per minute. If the rate of change in reactor power is not more than 10% FP / min, it is determined to be in a stable operating condition; if the rate of change in reactor power is greater than 10% FP / min, it is determined not to be in a stable operating condition.

[0077] If the operating conditions are not met, the intelligent controller performs simulation calculations on the detected information based on a preset simulation model to obtain corresponding simulation results. The simulation results include the water level change trend and the range of water level change amplitude.

[0078] In a more specific embodiment, the step of performing simulation calculations on the detection information according to a preset simulation model specifically includes the following steps: dividing the steam generator into control bodies according to the division rules in the simulation model to obtain corresponding control body division results; calculating each control body in the control body division results according to the control equations in the simulation model to obtain the physical property parameters of each control body; and solving and calculating the physical property parameters of each control body according to the gas-liquid conservation equations in the simulation model to obtain corresponding simulation calculation results.

[0079] The steam generator, primary loop, and secondary loop can be divided according to the partitioning rules set in the simulation model to obtain the control volume partitioning results. The partitioning rules include whether a cavity is an internal cavity, whether the cavity has flowing fluid, and whether the cavity has inlet and outlet ports. If all the criteria are met, the cavity is classified as a control volume. The control volume partitioning results are as follows: Figure 5 As shown, the steam chamber corresponds to one control body, numbered "(1)", the separator corresponds to two control bodies, numbered "(2)" and "(3)", and so on. The pipeline above the primary side inlet is divided into twelve control bodies numbered 1-12, and the pipeline above the primary side outlet is divided into twelve control bodies numbered 13-24.

[0080] Furthermore, based on the control equations in the simulation model, the control volumes included in the control volume partitioning result are calculated separately to obtain the physical property parameters of the control volumes.

[0081] Specifically, the governing equations include: M represents the control mass; U represents the control energy; W represents the flow channel mass flow rate; S represents the flow channel cross-section; ∑Q ST For generalized source terms; L is the channel length; Δp f For frictional pressure drop; Δp s For local pressure drop; Δp g For the pressure drop at high pressure; Δp a To accelerate pressure drop; h is specific enthalpy; subscripts i and j are control body numbers, k is the flow channel number between control bodies, in is the flow into the control body, out is the flow out of the control body, and ex is the flow rate between the control body and the external interface.

[0082] The pressure, specific enthalpy, and mass within the control volume, as well as the mass flow rate in the flow channel, can be obtained using the aforementioned control equations. The density, pressure, and specific enthalpy h within the controller... i The physical properties are determined according to the International Standard IAPWS-IF97 for the thermodynamic properties of water and water vapor, and the relevant relationship can be expressed as v i =f(p i ,h i In the formula, v i p is the specific volume of control volume i; i The pressure of control body i.

[0083] When water is present in the control volume, the cavitation fraction in the upper and lower regions of the control volume is discontinuous. The lower region may be in a cold water state or a saturated two-phase state, while the upper region may be in a superheated steam state or a saturated two-phase state containing droplets. During the transient process, the upper and lower regions expand and contract with changes in water level. Gas-liquid conservation equations are established for the upper and lower regions respectively in the transient numerical model. By solving the control equation for the lower region of the control volume with water level, this invention can track water level changes on the secondary side of the steam generator, thereby identifying false water level phenomena; the corresponding gas-liquid conservation equation is: A is the flow cross-section of the control volume, v is the specific heat capacity of the control volume, WL is the water level in the control volume, and the subscript un indicates the lower region of the control volume with water level.

[0084] Furthermore, the intelligent controller outputs the simulation calculation results and the water supply flow adjustment amount to the first flow regulator, so that the first flow regulator outputs a corresponding control command to the water supply regulating valve to adjust the water supply flow. Similarly, the first flow regulator R2 generates a corresponding control command based on the received simulation calculation results and water supply flow adjustment amount, and outputs the control command to the water supply regulating valve.

[0085] S105, the first flow regulator outputs a control command to the water supply regulating valve to regulate the water supply flow.

[0086] The first flow regulator outputs a control command to the water supply regulating valve to regulate the water supply flow. The first flow regulator R2 generates a corresponding control command based on the received parsing result and the water supply flow regulation amount, and outputs the control command to the water supply regulating valve; then the control command output by the first flow regulator R2 can control the change in the valve opening of the water supply regulating valve, and the control command is output to the water supply regulating valve V1 to make it act, thereby changing the water supply flow.

[0087] In a more specific embodiment, the steam generator further includes a second flow regulator and a feedwater pump speed regulator. The second flow regulator is communicatively connected to the intelligent controller, and the second flow regulator is communicatively connected to the feedwater pump speed regulator. The control method further includes the following steps: the intelligent controller acquires the feedwater header pressure value and the steam header pressure value from the detection information and performs a difference calculation to obtain the corresponding differential pressure measurement value; the intelligent controller inputs the differential pressure measurement value to the second flow regulator; the second flow regulator compares the differential pressure measurement value with the set differential pressure setting value, and outputs a control command to the feedwater pump speed regulator to adjust the pump speed according to the comparison result.

[0088] The specific working principle is as follows: Figure 4 As shown, the pressure difference setpoint between the water supply header and the steam header can be set to ΔP0. The intelligent controller performs a difference calculation on the pressure values ​​of the water supply header and the steam header from the detected information to obtain the corresponding pressure difference measurement value ΔP. The intelligent controller inputs the pressure difference measurement value to the second flow regulator. The second flow regulator compares the pressure difference measurement value ΔP with the pressure difference setpoint ΔP0. Based on the magnitude and direction of the deviation between the two values, the second flow regulator outputs a control command to the water pump speed regulator, thereby changing the speed of the water pump so that the pressure difference before and after the water pump speed regulator V2 remains constant.

[0089] The digital twin-based steam generator water level control method disclosed in the above embodiments includes: acquiring detection information obtained from sensors in real time and outputting the actual measured water level to a water level regulator to obtain the feedwater flow rate adjustment amount; analyzing the detection information according to a real-time online thermal balance model to obtain the analysis result, and outputting the analysis result and the feedwater flow rate adjustment amount to a first flow regulator, which then outputs a corresponding control command to the feedwater regulating valve to adjust the feedwater flow rate. This control method, by utilizing digital twin technology and numerical simulation technology, improves the water level control process of the steam generator to achieve accurate adjustment, thereby further improving the operational reliability, equipment safety, operational convenience, and unit operating efficiency of the nuclear power plant steam generator.

[0090] This invention also provides a digital twin-based steam generator water level control system, which is used to execute the control method described in the above embodiments, such as... Figure 3 As shown, the steam generator water level control system includes a 101 detection information acquisition unit, a 102 first information output unit, a 103 analysis result acquisition unit, a 104 second information output unit configured in the intelligent controller, and a 105 control command output unit configured in the first flow regulator.

[0091] The detection information acquisition unit 101 is used to acquire the detection information obtained by the sensor in real time.

[0092] The first information output unit 102 is used to output the actual measured water level in the detection information to the water level regulator in order to obtain the water supply flow rate regulation amount output by the water level regulator.

[0093] The analysis result acquisition unit 103 is used to analyze the primary-side detection data and secondary-side detection data in the detection information according to the preset real-time online heat balance model, and obtain the corresponding analysis results; the primary-side detection data is the detection data corresponding to the primary steam supply circuit side in the detection information, and the secondary-side detection data is the detection data corresponding to the secondary steam supply circuit side in the detection information; the analysis results include the calculated value of feedwater flow rate and the calculated value of steam flow rate.

[0094] The second information output unit 104 is used to output the analysis result and the water supply flow rate adjustment amount to the first flow regulator.

[0095] The control command output unit 105 is used to output control commands to the water supply regulating valve to regulate the water supply flow.

[0096] The digital twin-based steam generator water level control system provided in this embodiment of the invention applies the aforementioned digital twin-based steam generator water level control method. It acquires real-time detection information from sensors and outputs the actual measured water level to a water level regulator to obtain the feedwater flow rate adjustment amount. The detection information is analyzed using a real-time online thermal balance model to obtain the analysis result, which, along with the feedwater flow rate adjustment amount, is output to a first flow regulator. The first flow regulator then outputs a corresponding control command to the feedwater regulating valve to adjust the feedwater flow rate. This control method, leveraging digital twin technology and numerical simulation technology, improves the steam generator water level control process to achieve accurate adjustment, thereby further enhancing the operational reliability, equipment safety, operational convenience, and unit operating efficiency of the nuclear power plant steam generator.

[0097] This application also discloses a steam generator water level control device based on digital twin, wherein, as Figure 4 As shown, the steam generator water level control device includes an intelligent controller S, sensors, a first flow regulator R2, a water level regulator R1, a feedwater regulating valve V1, a second flow regulator R3, and a feedwater pump speed regulator V2; one end of the feedwater header is connected to the output port of the first feedwater pump, and the other end is connected to the feedwater input port of at least one steam generator; the feedwater regulating valve V1 is connected in series in the feedwater header on the side near the feedwater input port; each steam generator is connected to a steam turbine through the steam header; the sensors include a differential pressure sensor N and a steam pressure sensor N. The system includes a pressure sensor P1, a main pipe pressure sensor P2, a feedwater sensor Qs, a feedwater flow sensor Qa, an outlet water sensor Qw, and a steam flow sensor Qv. The two detection terminals of the differential pressure sensor N are respectively connected to two pressure detection ports of one of the steam generators, and the signal output terminal of the differential pressure sensor N is connected to the intelligent controller S. The detection terminal of the steam pressure sensor P1 is connected to the steam main pipe, and the signal output terminal of the steam pressure sensor P1 is connected to the intelligent controller S. The detection terminal of the main pipe pressure sensor P2 is connected to the feedwater flow sensor Qs, a feedwater flow sensor Qa, an outlet water sensor Qw, and a steam flow sensor Qv. The main water supply pipe is connected, and the signal output terminal of the main water supply pipe pressure sensor P2 is connected to the intelligent controller S; the detection terminal of the water supply sensor Qs is connected to the water supply pipe of the steam generator, and the signal output terminal of the water supply sensor Qs is connected to the intelligent controller S; the detection terminal of the water outlet sensor Qw is connected to the drain pipe of the steam generator, and the signal output terminal of the water outlet sensor Qw is connected to the intelligent controller S; the detection terminal of the steam flow sensor Qv is connected to the steam main pipe, and the signal output terminal of the steam flow sensor Qv is connected to the intelligent controller S; the detection terminal of the water supply flow sensor Qa is connected to the water supply main pipe, and the connection point is located upstream of the water supply regulating valve V1, and the signal output terminal of the water supply flow sensor Qa is connected to the intelligent controller S; the intelligent controller S communicates with each sensor, the first flow regulator R2, the water level regulator R1, and the second flow regulator R3; the first flow regulator R2 establishes a communication connection with the water supply regulating valve V1; the second flow regulator R3 establishes a communication connection with the water supply pump speed regulator V2.

[0098] Among them, steam pressure sensor P1 is used to measure the steam header pressure, and header pressure sensor P2 is used to measure the feedwater header pressure. Steam flow sensor Qv is used to measure steam flow, and feedwater flow sensor Qa is used to measure feedwater flow. Feedwater sensor Qs is used to measure the flow, pressure, and temperature of the primary side inlet pipe, and outlet sensor Qw is used to measure the flow, pressure, and temperature of the primary side outlet pipe.

[0099] Furthermore, the input port of the first water pump B1 is connected to the output port of the water pump speed regulator V2, and the input port of the water pump speed regulator V2 is used for water intake.

[0100] The aforementioned digital twin-based steam generator water level control system can be implemented as a computer program, and the aforementioned intelligent controller can be implemented as a computer device, on which the computer program can run. The controller includes a processor, a communication interface, a memory, and a communication bus. The processor, communication interface, and memory communicate with each other via the communication bus. The memory stores the computer program. When the processor executes the program stored in the memory, it implements the digital twin-based steam generator water level control method as described in the above embodiments.

[0101] Please see Figure 6 , Figure 6 This is a schematic block diagram of a computer device provided in an embodiment of the present invention. The computer device may be a processor for executing a digital twin-based steam generator water level control method to control various components.

[0102] See Figure 6 The computer device 500 includes a processor 502, a memory, and a communication interface 505 connected via a communication bus 501. The memory may include a storage medium 503 and internal memory 504.

[0103] The storage medium 503 may store an operating system 5031 and a computer program 5032. When the computer program 5032 is executed, it causes the processor 502 to execute a steam generator water level control method based on digital twins. The storage medium 503 may be a volatile storage medium or a non-volatile storage medium.

[0104] The processor 502 provides computing and control capabilities to support the operation of the entire computer device 500.

[0105] The internal memory 504 provides an environment for the operation of the computer program 5032 in the storage medium 503. When the computer program 5032 is executed by the processor 502, the processor 502 can execute a steam generator water level control method based on digital twin.

[0106] This communication interface 505 is used for network communication, such as providing data transmission. Those skilled in the art will understand that... Figure 6The structure shown is merely a block diagram of a portion of the structure related to the present invention and does not constitute a limitation on the computer device 500 to which the present invention is applied. The specific computer device 500 may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0107] The processor 502 is used to run the computer program 5032 stored in the memory to implement the corresponding functions in the above-mentioned digital twin-based steam generator water level control method.

[0108] Those skilled in the art will understand that Figure 6 The embodiments of the computer device shown do not constitute a limitation on the specific configuration of the computer device. In other embodiments, the computer device may include more or fewer components than illustrated, or combine certain components, or have different component arrangements. For example, in some embodiments, the computer device may include only memory and a processor. In such embodiments, the structure and function of the memory and processor are different from those shown. Figure 6 The embodiments shown are consistent and will not be described again here.

[0109] It should be understood that, in this embodiment of the invention, the processor 502 may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0110] In another embodiment of the invention, a computer-readable storage medium is provided. This computer-readable storage medium may be volatile or non-volatile. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps included in the above-described digital twin-based steam generator water level control method.

[0111] Those skilled in the art will readily understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those 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 this invention.

[0112] In the embodiments provided by this invention, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Units with the same function may be grouped into one unit. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, or it may be an electrical, mechanical, or other form of connection.

[0113] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of the present invention, depending on actual needs.

[0114] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0115] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a computer-readable storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned computer-readable storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), magnetic disks, or optical disks.

[0116] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A digital-twin-based steam generator water level control method, the control method being applied to a steam generator water level control system, an intelligent controller of the steam generator water level control system being communicatively connected with a sensor, a first flow regulator and a water level regulator arranged in a steam generator, the first flow regulator being communicatively connected with a feedwater regulating valve; characterized in that, The control method comprises: The intelligent controller acquires the detection information detected by the sensor in real time; The intelligent controller outputs the actual measured water level in the detection information to the water level regulator to obtain a feedwater flow adjustment amount output by the water level regulator; The intelligent controller analyzes the primary side detection data and the secondary side detection data in the detection information according to a preset real-time online heat balance model to obtain a corresponding analysis result; the primary side detection data is detection data corresponding to a primary steam supply loop side in the detection information, and the secondary side detection data is detection data corresponding to a secondary steam supply loop side in the detection information; the analysis result comprises a feedwater flow calculation value and a steam flow calculation value; The intelligent controller outputs the analysis result and the feedwater flow adjustment amount to the first flow regulator; The first flow regulator outputs a control instruction to the feedwater regulating valve to adjust the feedwater flow.

2. The digital twin-based steam generator water level control method of claim 1, wherein, Before the intelligent controller outputs the analysis result and the feedwater flow adjustment amount to the first flow regulator, the method further comprises: The intelligent controller determines whether the reactor power in the detection information meets a preset operating condition; If the operating condition is met, the intelligent controller executes the step of outputting the analysis result and the feedwater flow adjustment amount to the first flow regulator; If the operating condition is not met, the intelligent controller performs simulation calculation on the detection information according to a preset simulation model to obtain a corresponding simulation calculation result; the simulation calculation result comprises a water level change trend and a water level change amplitude range; The intelligent controller outputs the simulation calculation result and the feedwater flow adjustment amount to the first flow regulator to enable the first flow regulator to output a control instruction to the feedwater regulating valve to adjust the feedwater flow.

3. The digital twin-based steam generator water level control method of claim 2, wherein, The determination of whether the reactor power in the detection information meets the preset operating condition comprises: Determining whether the reactor power in the detection information is in a high-power operating condition; Determining whether the reactor power in the detection information is in a stable operating condition; If the reactor power is in a high-power operating condition and is in a stable operating condition, it is determined that the operating condition is met; If the reactor power is not in a high-power operating condition or is not in a stable operating condition, it is determined that the operating condition is not met.

4. The digital twin-based steam generator water level control method of claim 3, wherein, The analysis of the primary side detection data and the secondary side detection data in the detection information according to the preset real-time online heat balance model to obtain a corresponding analysis result comprises: Constructing a first relationship between the heat exchange power of the steam generator and the steam flow and the feedwater flow according to the real-time online heat balance model; Constructing a second relationship between the steam flow and the feedwater flow according to a water balance relationship; Substituting known quantities in the primary side detection data and the secondary side detection data into the first relationship and the second relationship to obtain a corresponding analysis result.

5. The digital twin-based steam generator water level control method of claim 4, wherein, The real-time online thermal balance model comprises and ; wherein, is the heat exchange power of the steam generator, is the volumetric specific heat capacity, W is the primary side coolant flow, and are the primary side inlet and outlet coolant temperatures respectively, is the heat exchange power between the primary side and the secondary side in the steam generator, A S is the heat exchange area, K is the total heat exchange coefficient, is the saturation temperature.

6. The digital twin-based steam generator water level control method of claim 5, wherein, The total heat exchange coefficient is calculated by ; is the primary side heat exchange coefficient, is the heat transfer tube thermal conductivity, is the fouling heat transfer coefficient, is the secondary side heat exchange coefficient.

7. The digital twin-based steam generator water level control method of claim 6, wherein, The first relationship is ; is the steam flow rate, is the secondary side blowdown flow rate, is the feedwater flow rate, is the saturated steam enthalpy value, is the saturated water enthalpy value, is the feedwater enthalpy value, is the percentage of moisture in the steam; The second relationship is .

8. The digital twin-based steam generator water level control method of claim 3, wherein, The simulation calculation of the detection information according to the preset simulation model to obtain a corresponding simulation calculation result comprises: The steam generator is controlled according to a division rule in the simulation model, to obtain a corresponding control body division result; The physical property parameters of each control body are calculated according to a control equation in the simulation model, to obtain the physical property parameters of each control body; The physical property parameters of each control body are calculated according to a control equation in the simulation model, to obtain the physical property parameters of each control body; 9. The digital twin-based steam generator water level control method of claim 8, wherein, The control equations include: , , ; M for control volume mass; U for control volume energy; W for flow path mass flow rate; S for flow path cross-sectional area; for generalized source term; L for flow path length; Δp f for frictional pressure drop; Δp s for local pressure drop; Δp g for gravity head pressure drop; Δp a for acceleration pressure drop; h for specific enthalpy; subscript i , j for control volume number, k for flow path number between control volumes, in for flow into control volume, out for flow out of control volume, ex for flow across control volume interface with outside.

10. The digital twin-based steam generator water level control method of claim 9, wherein, The gas-liquid conservation equation is ; A is the flow cross section of the control volume, v is the specific heat capacity of the control volume, WL is the water level in the control volume, the subscript un is the lower region of the control volume with water level.

11. The digital twin-based steam generator water level control method according to any one of claims 4-10, wherein, The intelligent controller outputs the actual measured water level in the detection information to the water level regulator, to obtain a feedwater flow adjustment amount output by the water level regulator, including: The intelligent controller outputs the actual measured water level in the detection information to the water level regulator; The water level regulator compares the actual measured water level with a set water level setting value, to obtain a corresponding feedwater flow adjustment amount and output to the intelligent controller.

12. The digital twin-based steam generator water level control method according to any one of claims 4-10, wherein, The steam generator further comprises a second flow regulator and a feedwater pump speed regulator, the second flow regulator is in communication connection with the intelligent controller, the second flow regulator is in communication connection with the feedwater pump speed regulator, and the control method further comprises: The intelligent controller obtains the feedwater main pipe pressure value and the steam main pipe pressure value in the detection information, and performs difference operation to obtain a corresponding differential pressure measurement value; The intelligent controller inputs the differential pressure measurement value to the second flow regulator; The second flow regulator compares the differential pressure measurement value with a set differential pressure setting value, and outputs a control instruction to the feedwater pump speed regulator according to the comparison result to adjust the pump speed.

13. A digital twin based steam generator water level control system, comprising: The steam generator water level control system is used to execute the digital twin-based steam generator water level control method according to any one of claims 1-12, and the steam generator water level control system comprises a detection information acquisition unit, a first information output unit, an analysis result acquisition unit, a second information output unit arranged in the intelligent controller, and a control instruction output unit arranged in the first flow regulator; The detection information acquisition unit is used to acquire the detection information detected by the sensor in real time; The first information output unit is used to output the actual measured water level in the detection information to the water level regulator, to obtain a feedwater flow adjustment amount output by the water level regulator; The analysis result acquisition unit is used to analyze primary side detection data and secondary side detection data in the detection information according to a preset real-time online heat balance model, to obtain a corresponding analysis result; The primary side detection data is detection data corresponding to the primary steam supply loop side in the detection information, and the secondary side detection data is detection data corresponding to the secondary steam supply loop side in the detection information; the analysis result includes a feedwater flow calculation value and a steam flow calculation value; The second information output unit is used to output the analysis result and the feedwater flow adjustment amount to the first flow regulator; The control instruction output unit is configured to output control instructions to the feedwater regulating valve to regulate the feedwater flow.

14. A digital-twin-based steam generator water level control apparatus, comprising: The steam generator water level control device comprises an intelligent controller, sensors, a first flow regulator, a water level regulator, a feedwater regulating valve, a second flow regulator, and a feedwater pump rotating speed regulator. One end of the feedwater main pipe is connected to the output port of the first feedwater pump, and the other end is connected to the feedwater input end of at least one steam generator; the feedwater regulating valve is arranged in the feedwater main pipe in series on the side close to the feedwater input end; each steam generator is connected to a steam turbine through a steam main pipe; The sensors comprise a differential pressure sensor, a steam pressure sensor, a main pipe pressure sensor, a feedwater sensor, a feedwater flow sensor, a water outlet sensor, and a steam flow sensor; The two detection ends of the differential pressure sensor are connected to the two pressure detection ports of one steam generator, and the signal output end of the differential pressure sensor is connected to the intelligent controller; the detection end of the steam pressure sensor is in communication with the steam main pipe, and the signal output end of the steam pressure sensor is connected to the intelligent controller; the detection end of the main pipe pressure sensor is in communication with the feedwater main pipe, and the signal output end of the main pipe pressure sensor is connected to the intelligent controller; The detection end of the feedwater sensor is in communication with the feedwater pipe of the steam generator, and the signal output end of the feedwater sensor is connected to the intelligent controller; the detection end of the water outlet sensor is in communication with the drain pipe of the steam generator, and the signal output end of the water outlet sensor is connected to the intelligent controller; the detection end of the steam flow sensor is in communication with the steam main pipe, and the signal output end of the steam flow sensor is connected to the intelligent controller; the detection end of the feedwater flow sensor is in communication with the feedwater main pipe and is located upstream of the feedwater regulating valve, and the signal output end of the feedwater flow sensor is connected to the intelligent controller; The intelligent controller is communicatively connected to each sensor, the first flow regulator, the water level regulator, and the second flow regulator; the first flow regulator is communicatively connected to the feedwater regulating valve; and the second flow regulator is communicatively connected to the feedwater pump rotating speed regulator. The intelligent controller comprises a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; The memory is configured to store a computer program; The processor is configured to execute the program stored on the memory to implement the steam generator water level control method based on digital twinning according to any one of claims 1-12.

15. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the steam generator water level control method based on digital twinning according to any one of claims 1-12.

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