Control method and system for once-through steam generator of nuclear reactor

Abstract

The invention provides a control method and system for a once-through steam generator of a nuclear reactor, and the method comprises the steps: responding to the load adjustment information of the once-through steam generator, and determining an opening proportion coefficient according to the current load change rate; determining the product of the opening proportion coefficient and the first opening deviation as a second opening deviation of the opening of the water supply valve of the once-through steam generator; the first opening degree deviation is the sum of the current load feedback value and the current pressure feedback value; the opening degree of the water supply valve is adjusted to the first opening degree; the first opening degree is the sum of the second opening degree deviation and the second opening degree; the second opening degree is the opening degree corresponding to the target load; and under the condition that the first steam pressure corresponding to the first opening degree is equal to the preset pressure, the opening degree of the water supply valve is kept unchanged at the first opening degree. According to the invention, the stability of steam pressure control of the once-through steam generator of the nuclear reactor at different load change rates can be improved, so that the nuclear reactor can be suitable for use scenes with different load change rate requirements.

Description

Technical Field

[0001] This application relates to the field of nuclear technology, and particularly to a control method and system for a once-through steam generator of a nuclear reactor. Background Art

[0002] The once-through steam generator is located between the primary circuit and the secondary circuit of a nuclear power plant. The heat generated by the reactor transmitted by the primary circuit on its primary side is transferred to the secondary side, and the fluid in the secondary side absorbs the heat transferred from the primary side to generate steam. The steam is then transmitted through the secondary circuit to a steam turbine generator for power generation.

[0003] In some operating scenarios, it is necessary to adjust the opening of the steam valve at the outlet of the secondary side of the once-through steam generator to adjust the load of the once-through steam generator. However, the load adjustment will affect the steam pressure in the once-through steam generator. To ensure the operating safety of the once-through steam generator, it is often necessary to synchronously adjust the opening of the feed water valve at the inlet of the secondary side to keep the steam pressure at the outlet of the secondary side of the once-through steam generator stable.

[0004] Currently, during the load adjustment process of the once-through steam generator, although two channels are considered for the steam pressure control of the once-through steam generator: the load feedback channel and the steam pressure feedback channel, no fine control is carried out for different load change rates, resulting in poor stability of the steam pressure control of the once-through steam generator under different load change rates, thus causing the problem that the applicable scenarios of the nuclear reactor are single due to limited load change rates. Summary of the Invention

[0005] The main objective of the embodiments of this application is to propose a control method and system for a once-through steam generator of a nuclear reactor, aiming to improve the stability of the steam pressure control of the once-through steam generator under different load change rates, so that the nuclear reactor can be applicable to usage scenarios with different load change rate requirements.

[0006] The present application provides a control method for a once-through steam generator of a nuclear reactor, including: S1. In response to the load regulation information of the once-through steam generator, obtaining the target operating condition parameters of the once-through steam generator; the target operating condition parameters include the current load change rate, the current pressure feedback value, and the current load feedback value of the once-through steam generator; the load regulation information includes the target load; S2. Determining an opening ratio coefficient according to the current load change rate; S3. Determining a second opening deviation of the feed water valve opening of the once-through steam generator as the product of the opening ratio coefficient and a first opening deviation; the first opening deviation is the sum of the current load feedback value and the current pressure feedback value; S4. Adjusting the feed water valve opening to a first opening; the first opening is the sum of the second opening deviation and a second opening; the second opening is the opening corresponding to the target load; S5. In the case where the first steam pressure at the secondary side outlet of the once-through steam generator corresponding to the first opening is not equal to the preset pressure, returning to execute the step of obtaining the target operating condition parameters of the once-through steam generator until the first steam pressure is equal to the preset pressure, and keeping the feed water valve opening unchanged at the first opening.

[0007] In one embodiment, the determining an opening ratio coefficient according to the current load change rate includes: determining a target opening ratio control parameter from at least two opening ratio control parameters according to the relationship between the current load change rate and a preset rate; and determining the opening ratio coefficient according to the target opening ratio control parameter and the current load change rate.

[0008] In one embodiment, the obtaining the target operating condition parameters of the once-through steam generator includes: determining a load ratio coefficient according to the current load of the once-through steam generator; determining the current load feedback value as the product of the load ratio coefficient and a first difference; the first difference is the difference between the current steam flow rate at the secondary side outlet of the once-through steam generator and the current feed water flow rate at the secondary side inlet of the once-through steam generator; determining a pressure ratio coefficient according to the current steam pressure at the secondary side outlet of the once-through steam generator; determining the current pressure feedback value as the product of the pressure ratio coefficient and a second difference; the second difference is the difference between the current steam pressure and the target steam pressure.

[0009] In one embodiment, the determining a load ratio coefficient according to the current load of the once-through steam generator includes: determining a target load ratio control parameter from at least two load ratio control parameters according to the comparison result between the current load and a preset load; and determining the load ratio coefficient according to the target load ratio control parameter and the current load.

[0010] In one embodiment, determining a pressure proportionality coefficient according to the current steam pressure at the secondary side outlet of the DC steam generator includes: determining a target pressure proportionality control parameter from at least two pressure proportionality control parameters according to a comparison result between the current steam pressure and a preset pressure; and determining the pressure proportionality coefficient according to the target pressure proportionality control parameter and the current steam pressure.

[0011] In one embodiment, determining a target pressure proportionality control parameter from at least two pressure proportionality control parameters according to a comparison result between the current steam pressure and a preset pressure includes: when the current steam pressure is less than or equal to the preset pressure, determining a plurality of first pressure proportionality control parameters from the at least two pressure proportionality control parameters; and determining the target pressure proportionality control parameter from the plurality of first pressure proportionality control parameters according to a comparison result between the current steam superheat degree at the secondary side outlet of the DC steam generator and a preset superheat degree.

[0012] In one embodiment, the load regulation information further includes a target load change rate; the control method further includes: inputting the target load change rate and the target load into a control parameter calculation model to obtain control parameter information of the DC steam generator; where the control parameter information includes the at least two opening proportionality control parameters.

[0013] In one embodiment, before inputting the target load change rate and the target load into the control parameter calculation model to obtain the control parameter information of the DC steam generator, the control method further includes: obtaining the best control parameter sample corresponding to each load regulation information sample in a plurality of load regulation information samples; and obtaining the control parameter calculation model according to each load regulation information sample and the best control parameter sample in combination with a chaotic polynomial.

[0014] In one embodiment, obtaining the best control parameter sample corresponding to each load regulation information sample in a plurality of load regulation information samples includes: obtaining a sample data set, where the sample data set includes a plurality of samples, and each sample includes the load regulation information sample, a plurality of control parameter samples corresponding to the load regulation information sample, and a target control effect; for each sample, performing the following steps: for each control parameter sample corresponding to the load regulation information sample, based on the load regulation information sample and the control parameter sample, performing step S1-step S5 to perform simulation control on the DC steam generator to obtain the simulation control effect corresponding to each control parameter sample; and determining the best control parameter sample according to the simulation control effect and the target control effect.

[0015] The embodiment of the present application further provides a control system for a once-through steam generator of a nuclear reactor, including an acquisition module, a first opening module, a second opening module, an opening adjustment module, and an execution module; the acquisition module is configured to obtain the target operating condition parameters of the once-through steam generator in response to the load adjustment information of the once-through steam generator; the target operating condition parameters include the current load change rate, the current pressure feedback value, and the current load feedback value of the once-through steam generator; the load adjustment information includes the target load; the first opening module is configured to determine an opening proportionality coefficient according to the current load change rate; the second opening module is configured to determine the product of the opening proportionality coefficient and the first opening deviation as the second opening deviation of the feed water valve opening of the once-through steam generator; the first opening deviation is the sum of the current load feedback value and the current pressure feedback value; the opening adjustment module is configured to adjust the feed water valve opening to a first opening; the first opening is the sum of the second opening deviation and the second opening; the second opening is the opening corresponding to the target load; the execution module is configured to, when the first steam pressure at the secondary side outlet of the once-through steam generator corresponding to the first opening is not equal to the preset pressure, return to execute the step of obtaining the target operating condition parameters of the once-through steam generator until the first steam pressure is equal to the preset pressure, and keep the feed water valve opening unchanged at the first opening.

[0016] A control method and system for a once-through steam generator of a nuclear reactor provided by the present application adjust the feed water valve opening of the once-through steam generator to a first opening based on the opening proportionality coefficient determined according to the current load change rate of the once-through steam generator, and when the first steam pressure at the secondary side outlet of the once-through steam generator corresponding to the first opening is equal to the preset pressure, keep the feed water valve opening unchanged at the first opening, which can improve the stability of steam pressure control of the once-through steam generator under different load change rates, so that the nuclear reactor can be applicable to usage scenarios with different load change rate requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic flow chart of the control method for a once-through steam generator of a nuclear reactor provided by an embodiment of the present application;

[0018] Figure 2 is a schematic flow chart of determining the pressure proportionality coefficient provided by an embodiment of the present application;

[0019] Figure 3 is a schematic flow chart of determining the control parameter calculation model provided by an embodiment of the present application;

[0020] Figure 4 is a specific schematic flow chart of the control method for a once-through steam generator of a nuclear reactor provided by an embodiment of the present application;

[0021] Figure 5 It is a schematic structural diagram of the control system of the once-through steam generator of the nuclear reactor provided by the embodiment of the present application;

[0022] Figure 6 It is a schematic structural diagram of the embodiment of the electronic device provided by the embodiment of the present application. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0024] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0025] The control method of the once-through steam generator of the nuclear reactor provided by the embodiment of the present application can be applied to a terminal, can also be applied to a server side, or can also be software running on the terminal or the server side. In some embodiments, the terminal can be a smart phone, a tablet computer, a notebook computer, a desktop computer, etc.; the server side can be configured as an independent physical server, can also be configured as a server cluster or a distributed system composed of multiple physical servers, or can also be configured as a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms; the software can be an application for implementing the control method of the once-through steam generator, etc., but is not limited to the above forms.

[0026] Next, in conjunction with the accompanying drawings, the control method of the once-through steam generator of the nuclear reactor provided by the embodiment of the present application will be described in detail through specific embodiments.

[0027] The embodiment of the present application provides a control method for a once-through steam generator of a nuclear reactor. Please refer to Figure 1 , the control method may include:

[0028] Step S1: In response to the load regulation information of the once-through steam generator, obtain the target operating condition parameters of the once-through steam generator; the target operating condition parameters include the current load change rate, the current pressure feedback value, and the current load feedback value of the once-through steam generator; the load regulation information includes the target load.

[0029] Step S2: Determine the opening ratio coefficient according to the current load change rate.

[0030] Step S3: Determine the second opening deviation of the feed water valve opening of the once-through steam generator as the product of the opening ratio coefficient and the first opening deviation; the first opening deviation is the sum of the current load feedback value and the current pressure feedback value.

[0031] Step S4: Adjust the feed water valve opening to the first opening; the first opening is the sum of the second opening deviation and the second opening; the second opening is the opening corresponding to the target load.

[0032] Step S5: In the case where the first steam pressure at the secondary side outlet of the once-through steam generator corresponding to the first opening is not equal to the preset pressure, return to execute the step of obtaining the target operating condition parameters of the once-through steam generator until the first steam pressure is equal to the preset pressure, and keep the feed water valve opening unchanged at the first opening.

[0033] Based on the opening ratio coefficient determined according to the current load change rate of the once-through steam generator, this embodiment of the present application adjusts the feed water valve opening of the once-through steam generator to the first opening, and when the first steam pressure at the secondary side outlet of the once-through steam generator corresponding to the first opening is equal to the preset pressure, keeps the feed water valve opening unchanged at the first opening, which can improve the stability of steam pressure control of the once-through steam generator under different load change rates, so that the nuclear reactor can be applicable to usage scenarios with different load change rate requirements.

[0034] Optionally, the load regulation information in the above step S1 is the information generated by the nuclear power plant in response to the change of power supply demand for regulating the load of the once-through steam generator. The load regulation information may include the target load and the target load change rate, where the target load indicates the target value of the load regulation of the once-through steam generator, and the target load change rate indicates at what rate the load of the once-through steam generator is regulated to the target value. During the load regulation process of the once-through steam generator, the nuclear power plant can determine the steam valve opening regulation rate based on the target load change rate, and adjust the steam valve opening at the secondary side outlet of the once-through steam generator according to the steam valve opening regulation rate to regulate the load of the once-through steam generator to the target load.

[0035] In one embodiment, step S2 of determining the opening proportion coefficient according to the current load change rate includes: determining the opening proportion coefficient according to the current load change rate in combination with the preset corresponding relationship between the load change rate and the opening proportion coefficient.

[0036] In one embodiment, step S3 of determining the second opening deviation of the feed water valve of the once-through steam generator by multiplying the opening proportion coefficient by the first opening deviation includes: determining the sum of the current load feedback value and the current pressure feedback value as the first opening deviation; multiplying the opening proportion coefficient by the first opening deviation to determine the second opening deviation of the feed water valve of the once-through steam generator.

[0037] In one embodiment, step S4 of adjusting the opening of the feed water valve to the first opening includes: determining the opening corresponding to the target load according to the target load in combination with the preset corresponding relationship between the load and the opening; determining the opening corresponding to the target load as the second opening; determining the sum of the second opening deviation and the second opening as the first opening; adjusting the opening of the feed water valve of the once-through steam generator to the first opening.

[0038] In the load regulation process of the once-through steam generator in the embodiment of the present application, by adding a second opening deviation determined based on the opening proportion coefficient on the basis of the opening corresponding to the target load, the opening of the feed water valve of the once-through steam generator is gradually adjusted to the opening corresponding to the target load, which can ensure the stability of the steam pressure control during the load regulation process of the once-through steam generator, and further improve the operation safety of the once-through steam generator and the reactor. In addition, based on the preset corresponding relationship between the load change rate and the opening proportion coefficient, the opening proportion coefficient can be quickly and accurately determined according to the current load change rate, which can improve the stability of the steam pressure control of the once-through steam generator under different load change rates, so that the nuclear reactor can be applicable to usage scenarios with different load change rate requirements.

[0039] Optionally, the first steam pressure in step S5 includes the steam pressure at the secondary side outlet of the once-through steam generator corresponding to each sampling time point within a preset time when the opening of the feed water valve is at the first opening. Optionally, when the steam pressure at the secondary side outlet of the once-through steam generator corresponding to any sampling time point within the preset time is not equal to the preset pressure, the first steam pressure is not equal to the preset pressure; when the steam pressure at the secondary side outlet of the once-through steam generator corresponding to each sampling time point within the preset time is equal to the preset pressure, the first steam pressure is equal to the preset pressure.

[0040] In addition, if the first steam pressure at the secondary side outlet of the once-through steam generator corresponding to the first opening degree is not equal to the preset pressure, it can indicate that when the opening degree of the feed water valve of the once-through steam generator is at the first opening degree, the steam pressure at the secondary side outlet fluctuates, that is, the steam pressure at the secondary side outlet is not stable at the preset pressure. It can be determined that when the opening degree of the feed water valve of the once-through steam generator is at the first opening degree, the stable state is not reached. Therefore, it is necessary to return to execute the step of obtaining the target operating condition parameters of the once-through steam generator, re-determine the first opening degree, and adjust the opening degree of the feed water valve of the once-through steam generator to the new first opening degree.

[0041] Furthermore, if the first steam pressure at the secondary side outlet of the once-through steam generator corresponding to the first opening degree is equal to the preset pressure, it can indicate that when the opening degree of the feed water valve of the once-through steam generator is at the first opening degree, the steam pressure at the secondary side outlet does not fluctuate, that is, the steam pressure at the secondary side outlet is stable at the preset pressure. It can be determined that when the opening degree of the feed water valve of the once-through steam generator is at the first opening degree, the stable state is reached.

[0042] Moreover, when the first steam pressure at the secondary side outlet of the once-through steam generator corresponding to the first opening degree is equal to the preset pressure, the above load feedback value, the above pressure feedback value, and the above second opening degree deviation are 0, that is, the first opening degree is equal to the second opening degree, and both are the opening degrees corresponding to the target load. It can be shown that when the first steam pressure at the secondary side outlet of the once-through steam generator corresponding to the first opening degree is equal to the preset pressure, the load of the once-through steam generator is equal to the target load, that is, the load adjustment target of the once-through steam generator is achieved. Therefore, there is no need to return to execute the step of obtaining the target operating condition parameters of the once-through steam generator, and the opening degree of the feed water valve can be kept unchanged at the first opening degree.

[0043] In another embodiment, the above step S2, determining the opening degree proportionality coefficient according to the current load change rate, includes:

[0044] Determining a target opening degree proportional control parameter from at least two opening degree proportional control parameters according to the relationship between the current load change rate and the preset rate;

[0045] Determining the opening degree proportionality coefficient according to the target opening degree proportional control parameter and the current load change rate.

[0046] Optionally, the current load change rate is calculated using formula (1):

[0047]

[0048] where V t is the current load change rate, FP t is the current load, and λ is the preset time constant.

[0049] Optionally, the opening ratio coefficient is calculated using formula (2):

[0050]

[0051] where K V is the opening ratio coefficient, V 0 is the preset rate, and a 1 , b 1 , a 2 , b 2 are the opening ratio control parameters; when V t > V 0 , the above-mentioned target opening ratio control parameters are a 1 , b 1 ; when -V 0 ≤ V t ≤ V 0 , the above-mentioned target opening ratio control parameters are a 2 , b 2 ; when V t < -V 0 , the above-mentioned target opening ratio control parameters are a 3 , b 3 .

[0052] It should be noted that the above formula (2) is only an example calculation formula for determining the opening ratio coefficient according to the target opening ratio control parameters and the current load change rate, and the present application does not limit the calculation formula of the opening ratio coefficient. The above at least two opening ratio control parameters can be preset values or obtained by inputting the target load change rate and the target load into the control parameter calculation model.

[0053] In the embodiment of the present application, according to the comparison result between the current load change rate of the DC steam generator and the preset rate, the target opening ratio control parameter is determined from at least two opening ratio control parameters, and the opening ratio coefficient is determined according to the target opening ratio control parameter and the current load change rate, which can improve the accuracy of determining the opening ratio coefficient, and further improve the accuracy of determining the opening adjustment value of the feed water valve of the DC steam generator under different load change rates, thereby improving the stability of the steam pressure control of the DC steam generator under different load change rates, so that the nuclear reactor can be applicable to usage scenarios with different load change rate requirements.

[0054] In one embodiment, obtaining the target operating condition parameters of the DC steam generator in step S1 includes:

[0055] Determining the load ratio coefficient according to the current load of the DC steam generator;

[0056] Determine the product of the load ratio coefficient and the first difference as the current load feedback value; the first difference is the difference between the current steam flow rate at the secondary side outlet of the once-through steam generator and the current feed water flow rate at the secondary side inlet of the once-through steam generator.

[0057] Determine the pressure ratio coefficient according to the current steam pressure at the secondary side outlet of the once-through steam generator.

[0058] Determine the product of the pressure ratio coefficient and the second difference as the current pressure feedback value; the second difference is the difference between the current steam pressure and the target steam pressure.

[0059] Optionally, calculate the current load using formula (3):

[0060]

[0061] where FP t is the current load, Q 1t is the steam flow rate at the secondary side outlet of the once-through steam generator, ΔH t is the enthalpy difference between the inlet and outlet of the secondary loop of the nuclear power plant, W 0 is the rated power of the once-through steam generator.

[0062] Optionally, calculate the current load feedback value using formula (4):

[0063] FP t ′ = K FP × (Q 1t - Q 2t ) (4)

[0064] where FP t ′ is the current load feedback value, K FP is the load ratio coefficient, Q 2t is the current feed water flow rate, Q 1t - Q 2t is the first difference.

[0065] Optionally, calculate the current pressure feedback value using formula (5):

[0066] P t ′ = K P × (P t - P 0 ) (5)

[0067] where P t ′ is the current pressure feedback value, K P is the pressure ratio coefficient, P t is the current steam pressure, P0 is the preset pressure.

[0068] Based on the current load of the once-through steam generator, the present application embodiment determines the load ratio coefficient, and based on the current steam pressure at the secondary side outlet of the once-through steam generator, determines the pressure ratio coefficient, which can improve the accuracy of determining the current load feedback value and the current pressure feedback value of the once-through steam generator under transient conditions, and further improve the stability of the steam pressure control of the once-through steam generator under transient conditions, and enhance the overall stability of the nuclear reactor under normal operation transients.

[0069] In one embodiment, the above determining the load ratio coefficient according to the current load of the once-through steam generator includes:

[0070] According to the current load, in combination with the corresponding relationship between the preset load and the load ratio coefficient, determine the load ratio coefficient.

[0071] Based on the preset corresponding relationship between the load and the load ratio coefficient, the present application embodiment can quickly and accurately determine the load ratio coefficient according to the current load, which can improve the efficiency and accuracy of determining the load ratio coefficient, and further improve the efficiency and accuracy of determining the current load feedback value of the once-through steam generator under transient conditions, so as to improve the stability of the steam pressure control of the once-through steam generator under transient conditions, and enhance the overall stability of the nuclear reactor under normal operation transients.

[0072] In another embodiment, the above determining the load ratio coefficient according to the current load of the once-through steam generator includes:

[0073] According to the comparison result between the current load of the once-through steam generator and the preset load, determine the target load ratio control parameter from at least two load ratio control parameters;

[0074] According to the target load ratio control parameter and the current load, determine the load ratio coefficient.

[0075] Optionally, the load ratio coefficient is calculated using formula (6):

[0076]

[0077] where, K FP is the load ratio coefficient, FP 0 is the preset load, a 4 , b 4 , a 5 , b 5 are load ratio control parameters; in the case of FP t > FP 0 , the above target load ratio control parameter is a 4 , b4 ; when FP t ≤ FP 0 the above target load ratio control parameter is a 5 , b 5 .

[0078] It should be noted that the above formula (6) is only an example calculation formula for determining the load ratio coefficient based on the target load ratio control parameter and the current load, and the present application does not limit the calculation formula of the load ratio coefficient. The above at least two load ratio control parameters can be preset values or obtained by inputting the target load change rate and the target load into the control parameter calculation model.

[0079] According to the comparison result between the current load of the DC steam generator and the preset load in the embodiment of the present application, the target load ratio control parameter is determined from at least two load ratio control parameters, and the load ratio coefficient is determined according to the target load ratio control parameter and the current load, which can improve the accuracy of determining the load ratio coefficient, and further improve the accuracy of determining the current load feedback value of the DC steam generator under transient conditions, so as to improve the stability of the steam pressure control of the DC steam generator under transient conditions and enhance the overall stability of the nuclear reactor under normal operation transients.

[0080] In one embodiment, determining the pressure ratio coefficient according to the current steam pressure at the secondary side outlet of the DC steam generator includes:

[0081] Determining the pressure ratio coefficient according to the current steam pressure in combination with the preset corresponding relationship between the steam pressure and the pressure ratio coefficient.

[0082] Based on the preset corresponding relationship between the steam pressure and the pressure ratio coefficient in the embodiment of the present application, the pressure ratio coefficient can be quickly and accurately determined according to the current steam pressure, which can improve the efficiency and accuracy of determining the pressure ratio coefficient, and further improve the efficiency and accuracy of determining the current pressure feedback value of the DC steam generator under transient conditions, so as to improve the stability of the steam pressure control of the DC steam generator under transient conditions and enhance the overall stability of the nuclear reactor under normal operation transients.

[0083] In another embodiment, determining the pressure ratio coefficient according to the current steam pressure at the secondary side outlet of the DC steam generator includes:

[0084] Determining the target pressure ratio control parameter from at least two pressure ratio control parameters according to the comparison result between the current steam pressure at the secondary side outlet of the DC steam generator and the preset pressure;

[0085] Determining the pressure ratio coefficient according to the target pressure ratio control parameter and the current steam pressure.

[0086] Optionally, the pressure proportionality coefficient is calculated using formula (7):

[0087]

[0088] where K P is the pressure proportionality coefficient, P t is the current steam pressure, P 0 is the preset pressure, a 6 , b 6 , a 7 , b 7 are the pressure proportional control parameters; when P t > P 0 , the above target pressure proportional control parameters are a 6 , b 6 ; when P t ≤P 0 , the above target pressure proportional control parameters are a 7 , b 7 .

[0089] It should be noted that the above formula (7) is only an example calculation formula for determining the pressure proportionality coefficient based on the target pressure proportional control parameters and the current steam pressure, and the present application does not limit the calculation formula of the pressure proportionality coefficient. The above at least two pressure proportional control parameters can be preset values or obtained by inputting the target load change rate and the target load into the control parameter calculation model.

[0090] In the embodiment of the present application, according to the comparison result between the current steam pressure at the secondary side outlet of the once-through steam generator and the preset pressure, the target pressure proportional control parameters are determined from at least two pressure proportional control parameters, and the pressure proportionality coefficient is determined according to the target pressure proportional control parameters and the current steam pressure, which can improve the accuracy of determining the pressure proportionality coefficient, and further improve the accuracy of determining the current pressure feedback value of the once-through steam generator under transient conditions, thereby improving the stability of the steam pressure control of the once-through steam generator under transient conditions and enhancing the overall stability of the nuclear reactor under normal operation transients.

[0091] In one embodiment, determining the target pressure proportional control parameters from at least two pressure proportional control parameters according to the comparison result between the current steam pressure and the preset pressure includes:

[0092] When the current steam pressure is less than or equal to the preset pressure, multiple first pressure proportional control parameters are determined from at least two pressure proportional control parameters;

[0093] Determine a target pressure ratio control parameter from multiple first pressure ratio control parameters according to the comparison result between the current steam superheat degree at the secondary side outlet of the DC steam generator and the preset superheat degree.

[0094] Optionally, when P t ≤ P 0 , the above a 7 = a 8 or a 9 , and the above b 7 = b 8 or b 9 .

[0095] Optionally, when DT t > DT 0 , the above a 7 = a 8 , and the above b 7 = b 8 ; when DT t ≤ DT 0 , the above a 7 = a 9 , and the above b 7 = b 9 .

[0096] Furthermore, when P t ≤ P 0 , the pressure ratio coefficient can be calculated using formula (8):

[0097]

[0098] where DT t is the current steam superheat degree, DT 0 is the preset superheat degree, a 8 , b 8 , a 9 , b 9 are the first pressure ratio control parameters; when DT t > DT 0 , the above target pressure ratio control parameter is a 8 , b 8 ; when DT t ≤ DT 0 , the above target pressure ratio control parameter is a 9 , b 9 .

[0099] As Figure 2 shown, the above determination of the pressure ratio coefficient according to the target pressure ratio control parameter and the current steam can include:

[0100] Step S201: Obtain the current steam pressure P at the secondary side outlet of the once-through steam generator t ;

[0101] Step S202: Determine whether the current steam pressure P t is greater than the preset pressure P 0 ;

[0102] If P t > P 0 , then execute Step S203: The pressure proportionality coefficient K p = K 1 ; where K 1 = a 6 + b 6 × P t ;

[0103] If P t ≤ P 0 , then execute Step S204: Obtain the current steam superheat DT at the secondary side outlet of the once-through steam generator t ;

[0104] Step S205: Determine whether the current steam superheat DT t is greater than the preset superheat DT 0 ;

[0105] If DT t > DT 0 , then execute Step S206: Let the pressure proportionality coefficient K p be equal to K 2 ; where K 2 = a 8 + b 8 × P t ;

[0106] If DT t ≤ DT 0 , then execute Step S207: Let the pressure proportionality coefficient K p be equal to K 3 ; where K 3 = a 9 + b 9 × P t .

[0107] In the embodiment of the present application, when the current steam pressure is less than or equal to the preset pressure, a plurality of first pressure ratio control parameters are determined from at least two pressure ratio control parameters, and according to the comparison result between the current steam superheat degree at the secondary side outlet of the once-through steam generator and the preset superheat degree, a target pressure ratio control parameter is determined from the plurality of first pressure ratio control parameters, which can improve the accuracy of determining the pressure ratio coefficient based on the target pressure ratio control coefficient, and further improve the accuracy of determining the current pressure feedback value of the once-through steam generator under transient conditions, thereby improving the stability of the steam pressure control of the once-through steam generator under transient conditions and enhancing the overall stability of the nuclear reactor under normal operation transients.

[0108] Optionally, the load regulation information further includes a target load change rate.

[0109] In one embodiment, the control method for the once-through steam generator of the nuclear reactor provided by the embodiment of the present application further includes:

[0110] Inputting the target load change rate and the target load into a control parameter calculation model to obtain control parameter information of the once-through steam generator;

[0111] Wherein, the control parameter information includes at least two opening ratio control parameters.

[0112] Optionally, the control parameter information further includes at least one of at least two load ratio control parameters and at least two pressure ratio control parameters.

[0113] In the embodiment of the present application, by inputting the target load change rate and the target load into the control parameter calculation model to obtain the opening ratio control parameters of the once-through steam generator, the efficiency and accuracy of determining the opening ratio coefficient based on the opening ratio control parameters can be improved, and further the efficiency and accuracy of determining the opening adjustment value of the feed water valve of the once-through steam generator based on the opening ratio coefficient under different load change rates can be improved, thereby improving the stability of the steam pressure control of the once-through steam generator under different load change rates and enabling the nuclear reactor to be applicable to usage scenarios with different load change rate requirements. Additionally, by inputting the target load change rate and the target load into the control parameter calculation model to obtain the load ratio control parameters and / or pressure ratio control parameters of the once-through steam generator, the efficiency and accuracy of determining the current load feedback value based on the load ratio control parameters and / or determining the current pressure feedback value based on the pressure ratio control parameters can be improved, thereby improving the stability of the steam pressure control of the once-through steam generator under transient conditions and enabling the nuclear reactor to be applicable to usage scenarios with different load change rate requirements.

[0114] In one embodiment, before inputting the target load change rate and the target load into the control parameter calculation model to obtain the control parameter information of the once-through steam generator, the control method for the once-through steam generator of the nuclear reactor provided by the embodiments of the present application further includes:

[0115] Obtain the optimal control parameter sample corresponding to each load regulation information sample among multiple load regulation information samples;

[0116] According to each load regulation information sample and the optimal control parameter sample, combined with the chaotic polynomial, obtain the control parameter calculation model.

[0117] A control method for the once-through steam generator of the nuclear reactor provided by the embodiments of the present application can quickly and accurately determine the control parameter calculation model by obtaining the optimal control parameter sample corresponding to each load regulation information sample among multiple load regulation information samples, and substituting each load regulation information sample and the optimal control parameter sample corresponding to each load regulation information sample into the chaotic polynomial respectively, so as to ensure the accuracy of the opening ratio control parameter, the load ratio control parameter and the pressure ratio control parameter of the once-through steam generator obtained by using the control parameter calculation model.

[0118] In one embodiment, the obtaining the optimal control parameter sample corresponding to each load regulation information sample among multiple load regulation information samples includes:

[0119] Obtain a sample data set, where the sample data set includes multiple samples, and each sample includes a load regulation information sample, multiple control parameter samples corresponding to the load regulation information sample, and a target control effect;

[0120] For each sample, perform the following steps:

[0121] For each control parameter sample corresponding to the load regulation information sample, based on the load regulation information sample and the control parameter sample, perform the above steps S1 - the above steps S5 to perform simulation control on the once-through steam generator, and obtain the simulation control effect corresponding to each control parameter sample;

[0122] Determine the optimal control parameter sample according to the simulation control effect and the target control effect.

[0123] Optionally, the above sample data set can be obtained by performing Latin hypercube sampling on historical data.

[0124] As Figure 3 shown, the determination process of the above control parameter calculation model may include:

[0125] Step S301: Obtain the i-th load regulation information sample in the sample data set;

[0126] Step S302: Obtain the j-th control parameter sample corresponding to the i-th load regulation information sample;

[0127] Step S303: Based on the i-th load regulation information sample and the j-th control parameter sample, execute the above Step S1 - the above Step S5 to obtain the simulated control effect of the j-th control parameter sample;

[0128] Step S304: Determine whether j is equal to n, where n is the total number of control parameter samples corresponding to the i-th load regulation information sample;

[0129] If j < n, then execute Step S305: Update j to j + 1 and return to execute Step S302;

[0130] If j = n, then execute Step S306: Determine the optimal control parameter sample corresponding to the i-th load regulation information sample according to the comparison results between the simulated control effects of the n control parameter samples corresponding to the i-th load regulation information sample and the target control effect;

[0131] Step S307: Determine whether i is equal to m, where m is the total number of load regulation information samples in the sample dataset;

[0132] If i < m, then execute Step S308: Update i to i + 1 and return to execute Step S301;

[0133] If i = m, then execute Step S309: According to the m load regulation information samples and the optimal control parameter samples corresponding to the m load regulation information samples, combined with the chaotic polynomial, obtain the control parameter calculation model.

[0134] In the embodiment of the present application, by obtaining the sample dataset and for each load regulation information sample in the sample dataset, execute the following steps: for each control parameter sample corresponding to the load regulation information sample, based on the load regulation information sample and the control parameter sample, execute the above Step S1 - the above Step S5 to perform simulated control on the once-through steam generator to obtain the simulated control effect corresponding to each control parameter sample; determine the optimal control parameter sample according to the simulated control effect and the target control effect, and finally according to each load regulation information sample and the optimal control parameter sample corresponding to each load regulation information sample, combined with the chaotic polynomial, obtain the control parameter calculation model, which can improve the stability of the control parameter model, thereby ensuring the effectiveness of obtaining the opening ratio control parameter, load ratio control parameter, and pressure ratio control parameter of the once-through steam generator by using the control parameter calculation model.

[0135] As Figure 4 shown, in a specific embodiment, the control method of the once-through steam generator of the nuclear reactor provided by the embodiment of the present application may include:

[0136] Step S401: Receive the load regulation information of the once-through steam generator; the load regulation information includes the target load.

[0137] Step S402: Obtain the current steam flow rate and the current steam pressure at the secondary side outlet of the once-through steam generator.

[0138] Step S403: Determine the current load of the once-through steam generator according to the current steam flow rate.

[0139] Step S404: Determine the current load change rate of the once-through steam generator according to the current load.

[0140] Step S405: Determine the load proportionality coefficient of the once-through steam generator according to the current load.

[0141] Step S406: Determine the opening proportionality coefficient of the once-through steam generator according to the current load change rate.

[0142] Step S407: Determine the pressure proportionality coefficient of the once-through steam generator according to the current steam pressure.

[0143] Step S408: Determine the current load feedback value by multiplying the load proportionality coefficient by the first difference; the first difference is the difference between the current steam flow rate at the secondary side outlet of the once-through steam generator and the current feed water flow rate at the secondary side inlet of the once-through steam generator.

[0144] Step S409: Determine the current pressure feedback value by multiplying the pressure proportionality coefficient by the second difference; the second difference is the difference between the current steam pressure and the target steam pressure.

[0145] Step S410: Determine the first opening deviation of the feed water valve opening of the once-through steam generator by adding the current load feedback value and the current pressure feedback value.

[0146] Step S411: Determine the second opening deviation of the feed water valve opening of the once-through steam generator by multiplying the first opening deviation by the opening proportionality coefficient.

[0147] Step S412: Adjust the feed water valve opening to the first opening; the first opening is the sum of the second opening deviation and the second opening; the second opening is the opening corresponding to the target load.

[0148] Step S413: Determine whether the first steam pressure at the secondary side outlet of the once-through steam generator corresponding to the first opening is equal to the preset pressure.

[0149] If the first steam pressure at the secondary side outlet of the once-through steam generator corresponding to the first opening degree is equal to the preset pressure, then perform step S414: Keep the opening degree of the feed water valve of the once-through steam generator unchanged at the first opening degree;

[0150] If the first steam pressure at the secondary side outlet of the once-through steam generator corresponding to the first opening degree is not equal to the preset pressure, then return to perform step S402.

[0151] Among them, the specific implementation processes of steps S403 - S407 can refer to the descriptions in the above embodiments, and will not be elaborated here.

[0152] A control method for a once-through steam generator of a nuclear reactor provided by an embodiment of the present application may, but is not limited to, include the following

[0153] Beneficial effects:

[0154] In the first aspect, by using control parameters that vary with the current load, current steam pressure, and current load change rate of the once-through steam generator to control the steam pressure of the once-through steam generator, it is possible to reduce the overshoot in regulating the secondary circuit steam pressure during the normal operation transient of the reactor, optimize the effect of controlling the steam pressure of the once-through steam generator, improve the stability of steam pressure control of the once-through steam generator under transient conditions, and enhance the overall stability of the nuclear reactor during the normal operation transient.

[0155] In the second aspect, when the current steam pressure is lower than the preset pressure, by using control parameters that vary with the steam superheat degree at the secondary side outlet of the once-through steam generator to control the steam pressure of the once-through steam generator, it is beneficial to maintain the steam superheat degree at the secondary side outlet of the once-through steam generator during the process of controlling the steam pressure of the once-through steam generator, avoid the occurrence of an undersaturated state, and thus be able to maintain the stable operation of the steam turbine and improve the heat exchange efficiency of the once-through steam generator.

[0156] In the third aspect, when the current load change rate is relatively fast, by using control parameters that vary with the current load change rate of the once-through steam generator to control the steam pressure of the once-through steam generator, it is possible to improve the stability of steam pressure control of the once-through steam generator, increase the normal operation margin of the reactor, and also improve the stability of steam pressure control of the once-through steam generator under different load change rates, enabling the nuclear reactor to be applicable to usage scenarios with different load change rate requirements.

[0157] In the fourth aspect, obtaining the optimal control parameters of the once-through steam generator based on the control parameter calculation model can further improve the stability of steam pressure control of the once-through steam generator under transient conditions, as well as the stability of steam pressure control of the once-through steam generator under different load change rates.

[0158] Fifthly, it is easy to implement.

[0159] Please refer to Figure 5 , an embodiment of the present application further provides a control system 500 for a direct current steam generator of a nuclear reactor, including an acquisition module 501, a first opening degree module 502, a second opening degree module 503, an opening degree adjustment module 504, and an execution module 505.

[0160] Among them, the acquisition module 501 is configured to acquire target operating condition parameters of the direct current steam generator in response to load adjustment information of the direct current steam generator; the target operating condition parameters include the current load change rate, the current pressure feedback value, and the current load feedback value of the direct current steam generator; the load adjustment information includes the target load;

[0161] The first opening degree module 502 is configured to determine an opening degree proportionality coefficient according to the current load change rate;

[0162] The second opening degree module 503 is configured to determine the product of the opening degree proportionality coefficient and the first opening degree deviation as the second opening degree deviation of the feed water valve opening degree of the direct current steam generator; the first opening degree deviation is the sum of the current load feedback value and the current pressure feedback value;

[0163] The opening degree adjustment module 504 is configured to adjust the feed water valve opening degree to the first opening degree; the first opening degree is the sum of the second opening degree deviation and the second opening degree; the second opening degree is the opening degree corresponding to the target load;

[0164] The execution module 505 is configured to, when the first steam pressure at the secondary side outlet of the direct current steam generator corresponding to the first opening degree is not equal to the preset pressure, return to the step of acquiring the target operating condition parameters of the direct current steam generator until the first steam pressure is equal to the preset pressure, and keep the feed water valve opening degree unchanged at the first opening degree.

[0165] The control system of the direct current steam generator of the nuclear reactor provided by the embodiment of the present application can implement each step of the control method embodiment of the above direct current steam generator, and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0166] Optionally, an embodiment of the present application further provides an electronic device, including a processor and a memory. A program or instruction that can run on the processor is stored on the memory. When the program or instruction is executed by the processor, each step of the control method embodiment of the above direct current steam generator of the nuclear reactor is implemented, and the same technical effects can be achieved. To avoid repetition, it will not be elaborated here. It should be noted that the electronic device in the embodiment of the present application includes the above-mentioned mobile electronic device and non-mobile electronic device.

[0167] Figure 6Schematic diagram of the hardware structure of the electronic device according to an embodiment of the present application. The electronic device includes:

[0168] A processor 601, which can be implemented in ways such as a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application;

[0169] A memory 602, which can be implemented in forms such as a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 602 can store an operating system and other application programs. When implementing the technical solutions provided in the embodiments of this specification through software or firmware, the relevant program codes are stored in the memory 602 and are called by the processor 601 to execute the control method of the once-through steam generator in the embodiments of the present application;

[0170] An input / output interface 603, which is used to implement information input and output;

[0171] A communication interface 604, which is used to implement communication interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.);

[0172] A bus 605, which transmits information between various components of the device (such as the processor 601, the memory 602, the input / output interface 603, and the communication interface 604);

[0173] Among them, the processor 601, the memory 602, the input / output interface 603, and the communication interface 604 are communicatively connected to each other inside the device through the bus 605.

[0174] The electronic device provided in the embodiments of the present application can implement each step of the control method embodiment of the above-mentioned once-through steam generator of the nuclear reactor and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0175] The embodiments of the present application also provide a computer-readable storage medium. A program or instruction is stored on the computer-readable storage medium. When the program or instruction is executed by a processor, it implements each step of the control method embodiment of the above-mentioned once-through steam generator of the nuclear reactor and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0176] Among them, the processor is the processor in the electronic device described in the above embodiments. The computer-readable storage medium includes computer-readable storage media such as computer read-only memory ROM, random access memory RAM, magnetic disks, or optical discs, etc.

[0177] Another embodiment of the present application provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various steps of the above embodiments of the control method of the nuclear reactor direct current steam generator, and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0178] It should be understood that the chip mentioned in the embodiments of the present application may also be referred to as a system-on-chip, system chip, chip system, or system-on-chip, etc.

[0179] The embodiments of the present application provide a computer program product. The program product is stored in a storage medium and is executed by at least one processor to implement the various steps of the above embodiments of the control method of the nuclear reactor direct current steam generator, and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0180] It should be noted that in this article, the term "including", "comprising", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article, or device. Without more limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article, or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0181] Through the description of the above embodiments, those skilled in the art can clearly understand that the above method of the embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions for causing a terminal (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present application.

[0182] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. A control method for a nuclear reactor once-through steam generator, characterized in that: include: S1. In response to load regulation information of a direct current steam generator, obtaining target operating parameters of the direct current steam generator; the target operating parameters include a current load change rate, a current pressure feedback value, and a current load feedback value of the direct current steam generator; the load regulation information includes a target load; S2. Determine the opening proportional coefficient according to the current load change rate; S3, determining the product of the opening proportional coefficient and the first opening deviation as the second opening deviation of the feedwater valve opening of the once-through steam generator; the first opening deviation is the sum of the current load feedback value and the current pressure feedback value; S4, adjusting the opening of the water supply valve to a first opening; The first opening is the sum of the second opening deviation and the second opening; The second opening degree is the opening degree corresponding to the target load; S5. When the first steam pressure at the secondary side outlet of the direct current steam generator corresponding to the first opening is not equal to the preset pressure, return to execute the step of obtaining the target operating parameters of the direct current steam generator until the first steam pressure is equal to the preset pressure, and keep the water supply valve opening unchanged at the first opening.

2. The control method according to claim 1, characterized in that: Determining the opening proportional coefficient according to the current load change rate includes: Determining a target opening ratio control parameter from at least two opening ratio control parameters according to a relationship between the current load change rate and a preset rate; The opening proportional coefficient is determined according to the target opening proportional control parameter and the current load change rate.

3. The control method according to claim 1, characterized in that: The obtaining of the target operating parameters of the once-through steam generator includes: Determining a load proportionality coefficient according to a current load of the once-through steam generator; The product of the load proportional coefficient and the first difference is determined as the current load feedback value; the first difference is the difference between the current steam flow rate at the secondary side outlet of the direct current steam generator and the current feed water flow rate at the secondary side inlet of the direct current steam generator; Determining a pressure proportionality coefficient according to a current steam pressure at a secondary side outlet of the once-through steam generator; The product of the pressure proportionality coefficient and the second difference is determined as the current pressure feedback value; the second difference is the difference between the current steam pressure and the target steam pressure.

4. The control method according to claim 3, characterized in that: Determining the load proportionality coefficient according to the current load of the once-through steam generator includes: Determining a target load proportion control parameter from at least two load proportion control parameters according to a comparison result between the current load and the preset load; The load proportion coefficient is determined according to the target load proportion control parameter and the current load.

5. The control method according to claim 3, characterized in that: The step of determining the pressure proportionality coefficient according to the current steam pressure at the secondary side outlet of the once-through steam generator comprises: Determining a target pressure proportional control parameter from at least two pressure proportional control parameters according to a comparison result between the current steam pressure and the preset pressure; The pressure proportionality coefficient is determined according to the target pressure proportionality control parameter and the current steam pressure.

6. The control method according to claim 5, characterized in that: The step of determining a target pressure ratio control parameter from at least two pressure ratio control parameters according to a comparison result between the current steam pressure and the preset pressure includes: In a case where the current steam pressure is less than or equal to the preset pressure, determining a plurality of first pressure proportional control parameters from the at least two pressure proportional control parameters; The target pressure proportional control parameter is determined from the plurality of first pressure proportional control parameters according to a comparison result between a current steam superheat at a secondary side outlet of the once-through steam generator and a preset superheat.

7. The control method according to claim 2, characterized in that: The load adjustment information also includes a target load change rate; and the control method further includes: Inputting the target load change rate and the target load into a control parameter calculation model to obtain control parameter information of the once-through steam generator; Wherein, the control parameter information includes the at least two opening ratio control parameters.

8. The control method according to claim 7, characterized in that: Before inputting the target load change rate and the target load into a control parameter calculation model to obtain control parameter information of the once-through steam generator, the control method further includes: Obtaining an optimal control parameter sample corresponding to each load regulation information sample among a plurality of load regulation information samples; The control parameter calculation model is obtained according to each of the load regulation information samples and the optimal control parameter samples in combination with a chaotic polynomial.

9. The control method according to claim 8, characterized in that: The obtaining of the optimal control parameter sample corresponding to each of the load adjustment information samples in the plurality of load adjustment information samples comprises: Acquire a sample data set, wherein the sample data set includes a plurality of samples, each of the samples includes the load regulation information sample, a plurality of control parameter samples corresponding to the load regulation information sample, and a target control effect; For each sample, perform the following steps: For each of the control parameter samples corresponding to the load adjustment information sample, based on the load adjustment information sample and the control parameter sample, steps S1 to S5 are executed to simulate control of the once-through steam generator to obtain a simulated control effect corresponding to each of the control parameter samples; The optimal control parameter sample is determined according to the simulated control effect and the target control effect.

10. A control system for a nuclear reactor once-through steam generator, characterized in that: It includes an acquisition module, a first opening module, a second opening module, an opening adjustment module and an execution module; The acquisition module is used to respond to the load regulation information of the direct current steam generator to acquire the target operating parameters of the direct current steam generator; the target operating parameters include the current load change rate, the current pressure feedback value and the current load feedback value of the direct current steam generator; the load regulation information includes the target load; The first opening module is used to determine the opening proportional coefficient according to the current load change rate; The second opening module is used to determine the product of the opening proportional coefficient and the first opening deviation as the second opening deviation of the feedwater valve opening of the once-through steam generator; the first opening deviation is the sum of the current load feedback value and the current pressure feedback value; The opening adjustment module is used to adjust the opening of the water supply valve to a first opening; The first opening is the sum of the second opening deviation and the second opening; The second opening degree is the opening degree corresponding to the target load; The execution module is used to return to execute the step of obtaining the target operating parameters of the direct-flow steam generator when the first steam pressure at the secondary side outlet of the direct-flow steam generator corresponding to the first opening is not equal to the preset pressure, until the first steam pressure is equal to the preset pressure, and keep the water supply valve opening unchanged at the first opening.

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