Steam generator pressure control method, device and equipment and storage medium

Abstract

The embodiment of the invention provides a steam generator pressure control method and device, equipment and a storage medium. The method comprises the steps that when the power generation system is in a preset working condition, the total parallel steam power and the turbine power of the power generation system at the current moment and the set pressure and the actually-measured pressure of a target steam generator at the current moment are obtained; according to the total parallel steam power and the turbine power, the feed-forward opening degree of a bypass valve of the target steam generator at the current moment is determined; according to the set pressure and the actually measured pressure, the feedback opening degree of the bypass valve at the current moment is determined; according to the feedforward opening degree and the feedback opening degree, an opening degree instruction of the bypass valve at the current moment is generated; wherein the opening degree instruction is used for controlling the opening degree of a bypass valve. The method is used for achieving the effect of preventing overpressure of the steam generator.

Description

Technical Field

[0001] This application relates to the technical field of nuclear power generation, and in particular to a method, device, equipment and storage medium for controlling the pressure of a steam generator. Background Art

[0002] Nuclear power generation utilizes the heat energy released during nuclear fission of nuclear fuel in a nuclear reactor. Based on a steam generator, high-temperature and high-pressure steam is generated. The steam enters a steam turbine through a pipeline, driving the steam turbine to rotate at high speed, and driving a generator to rotate for power generation.

[0003] In the related art, after multiple nuclear reactors complete steam parallel operation, the bypass valve corresponding to each nuclear reactor switches to the "overpressure protection mode". In this mode, in the event of operating conditions such as steam turbine trip or fast cut back (FCB), in order to prevent the steam generator (SG) from overpressurizing, it is necessary to relieve pressure based on the bypass valve. However, currently, it is mostly to directly control the bypass valve to open fully for pressure relief. This method results in large fluctuations in the air pressure of the SG and a strong impact on the SG, affecting the service life of the SG. Summary of the Invention

[0004] Embodiments of this application provide a method, device, equipment and storage medium for controlling the pressure of a steam generator, so as to achieve the effect of preventing the steam generator from overpressurizing.

[0005] In a first aspect, embodiments of this application provide a method for controlling the pressure of a steam generator, including:

[0006] When the power generation system is in a preset operating condition, obtain the total parallel operation power and steam turbine power of the power generation system at the current moment, and the set pressure and measured pressure of the target steam generator at the current moment;

[0007] Determine the feedforward opening of the bypass valve of the target steam generator at the current moment according to the total parallel operation power and the steam turbine power; and determine the feedback opening of the bypass valve at the current moment according to the set pressure and the measured pressure;

[0008] Generate an opening command for the bypass valve at the current moment according to the feedforward opening and the feedback opening; wherein, the opening command is used to control the opening of the bypass valve.

[0009] In a possible implementation manner, the generating an opening command for the bypass valve at the current moment according to the feedforward opening and the feedback opening includes:

[0010] Obtain the current duration of the power generation system in the preset operating condition;

[0011] Determine the total opening of the bypass valve at the current moment according to the current duration, the feedforward opening, and the feedback opening;

[0012] Generate an opening command for the bypass valve at the current moment according to the total opening of the bypass valve at the current moment.

[0013] In a possible implementation manner, the determining the total opening of the bypass valve at the current moment according to the current duration, the feedforward opening, and the feedback opening includes:

[0014] Determine a first weight coefficient and a second weight coefficient at the current moment according to the current duration; wherein, the first weight coefficient represents the coefficient of the feedforward opening, and the second weight coefficient represents the coefficient of the feedback opening;

[0015] Determine the total opening of the bypass valve at the current moment according to the first weight coefficient, the second weight coefficient, the feedforward opening, and the feedback opening.

[0016] In a possible implementation manner, the determining the feedforward opening of the bypass valve of the target steam generator at the current moment according to the combined steam total power and the steam turbine power includes:

[0017] Determine a first difference between the combined steam total power and the steam turbine power at the current moment;

[0018] Determine the feedforward opening of the bypass valve at the current moment according to the first difference and a preset opening function.

[0019] In a possible implementation manner, the determining the feedforward opening of the bypass valve at the current moment according to the first difference and a preset opening function includes:

[0020] Obtain the aging degree factor of the target steam generator;

[0021] Determine the feedforward opening of the bypass valve at the current moment according to the aging degree factor, the first difference, and a preset opening function.

[0022] In a possible implementation manner, the determining the feedback opening of the bypass valve at the current moment according to the set pressure and the measured pressure includes:

[0023] Determine a second difference between the set pressure and the measured pressure at the current moment;

[0024] Determine the feedback opening of the bypass valve at the current moment according to the second difference and a preset feedback control algorithm.

[0025] In a possible implementation, obtaining the set pressure of the target steam generator at the current moment includes:

[0026] Obtain the control mode of the power generation system at the current moment, and based on the control mode, determine the initial set pressure of the target steam generator at the current moment;

[0027] Determine the offset pressure of the target steam generator at the current moment according to the preset working condition of the power generation system;

[0028] Determine the set pressure of the target steam generator at the current moment according to the initial set pressure and the offset pressure.

[0029] In a second aspect, an embodiment of the present application provides a control device for the pressure of a steam generator, including:

[0030] An acquisition module, configured to acquire the total parallel steam power and the steam turbine power of the power generation system at the current moment when the power generation system is in a preset working condition, and the set pressure and the measured pressure of the target steam generator at the current moment;

[0031] A determination module, configured to determine the feedforward opening degree of the bypass valve of the target steam generator at the current moment according to the total parallel steam power and the steam turbine power; and determine the feedback opening degree of the bypass valve at the current moment according to the set pressure and the measured pressure;

[0032] A generation module, configured to generate an opening degree command of the bypass valve at the current moment according to the feedforward opening degree and the feedback opening degree; wherein, the opening degree command is used to control the opening degree of the bypass valve.

[0033] In a third aspect, an embodiment of the present application provides an electronic device, including: a memory, a processor;

[0034] The memory stores computer execution instructions;

[0035] The processor executes the computer execution instructions stored in the memory, so that the processor executes the first aspect and / or various possible implementation manners of the first aspect as above.

[0036] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer execution instructions are stored, and when the computer execution instructions are executed by a processor, they are used to implement the first aspect and / or various possible implementation manners of the first aspect as above.

[0037] In a fifth aspect, an embodiment of the present application provides a computer program product, including a computer program, and when the computer program is executed by a processor, it implements the first aspect and / or various possible implementation manners of the first aspect as above.

[0038] The control method, device, equipment and storage medium for the pressure of a steam generator provided by an embodiment of this application. When the distributed control system (DCS) is in a preset working condition of the power generation system, it can determine the feed-forward opening and feedback opening of the bypass valve of the target steam generator at the current moment in real time through the total power of steam merging and the power of the steam turbine of the power generation system at the current moment, as well as the set pressure and measured pressure of the target steam generator at the current moment, and generate an opening command according to the feed-forward opening and feedback opening to control the opening of the bypass valve. In this way, on the one hand, the DCS can adjust the opening of the bypass valve of each steam generator in real time based on the operating parameters of the power generation system, preventing the steam generator from overpressurizing, rather than directly fully opening the bypass valve. It can relieve pressure based on the current operating conditions of each steam generator, reducing the impact on the steam generator and extending the service life of the steam generator. On the other hand, keeping the bypass valve fully open for a long time will cause the pressure of the steam generator to drop rapidly. After waiting for the steam turbine generator set to resume normal operation, it is necessary to wait for the steam generator to boost pressure again, and the waiting time interval is relatively long. However, through the method of this application, the pressure of each steam generator can be maintained at the set pressure based on real-time opening control, reducing the waiting time and the waiting cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0040] Figure 1 It is a schematic diagram of a nuclear power generation scenario provided by this application;

[0041] Figure 2 It is a schematic flow chart of the control method for the pressure of the steam generator provided by this application Figure 1 ;

[0042] Figure 3 It is a schematic flow chart of the control method for the pressure of the steam generator provided by this application Figure 2 ;

[0043] Figure 4 It is a schematic logical structure diagram of the control method for the pressure of the steam generator provided by an embodiment of this application;

[0044] Figure 5 It is a schematic structure diagram of the control device for the pressure of the steam generator provided by this application;

[0045] Figure 6 It is a schematic structure diagram of the electronic equipment provided by this application.

[0046] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and will be described in more detail hereinafter. These drawings and the written description are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by reference to specific embodiments. Detailed Description of Specific Embodiments

[0047] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0048] The high-temperature gas-cooled reactor nuclear power generation system generally adopts a design of multiple reactors with one turbine generator set, that is, multiple reactors correspond to one steam turbine generator set. Each reactor is relatively independent, and each reactor is equipped with a steam generator. The pipeline structure of each steam generator can refer to Figure 1 as shown Figure 1 is a schematic diagram of a nuclear power generation scenario provided by the present application. The main steam pipeline at the outlet of the steam generator is divided into two branches. Pipeline 1 is the main steam path, which is used to collect the steam in front of the steam turbine generator and feed it into the main steam header; Pipeline 2 is the start-up and shutdown reactor loop, which is used to discharge the unqualified and excess steam during the start-up and shutdown of the unit through the bypass. Among them, Pipeline 2 can include components such as a steam-water separator, a condenser, an isolation valve, etc., which can be specifically set according to actual needs, and are not limited in this embodiment of the present application. The main steam header is used to collect the steam from other reactors. For example, referring to Figure 1 as shown, it can collect the incoming steam from the 2# reactor, 3# reactor, 4# reactor, and 5# reactor.

[0049] The bypass is as shown by the dotted box in Figure 1 This bypass can include components such as a bypass valve, a spray valve, a spray isolation valve, etc., which can be specifically set according to actual needs. The execution mode of the bypass can be hydraulic or pneumatic, and is not limited in this embodiment of the present application. It should be noted that Figure 1 shows several exemplary components and does not represent all components of the power generation system.

[0050] Referring to Figure 1 as shown, the bypass control of the power generation system can include the following control modes:

[0051] (1)5.0 MPa.a Constant Pressure Operation Mode: Since the initial feed water temperature is relatively low, about 105 °C, during the start-up process of the 1# steam generator, it will go through several stages including subcooled water, undersaturated water, two-phase steam-water, and superheated steam. In the subcooled water stage, the drain water flows back to the condenser through the steam-water separator. Throughout this stage, the valve 1 at the outlet of the 1# steam generator maintains a constant SG outlet pressure of 13.9 MPa.a, and the bypass is not put into operation at this time. As the reactor power increases, steam gradually accumulates in the steam-water separator. When the pressure in the steam-water separator is around 5.0 MPa.a, the bypass can be put into operation, and the steam is discharged to the condenser through the bypass. At this time, the bypass maintains the pressure of valve 1 at the SG outlet at 5.0 MPa.a to keep the SG outlet pressure difference relatively stable and shorten the transition time of the two-phase flow. When the steam parameters are stable, the steam turbine can be rotated and synchronized. At this time, the steam pressure in front of the steam turbine is about 4.75 MPa.a.

[0052] (2)5.0 MPa.a - 13.5 MPa.a Pressure Tracking Mode: As the reactor power increases, the steam turbine gradually increases the load, and the opening of the bypass valve (valve 2) gradually decreases until it is completely closed. The steam pressure in front of the turbine steadily rises from 4.75 MPa.a to 13.5 MPa.a, and when the steam turbine power is lower than the reactor power it matches and reaches a certain limit, the excess steam is discharged to the condenser.

[0053] (3)13.9 MPa.a Constant Pressure Mode: When the steam pressure in front of the turbine rises to the rated pressure, the valves (valve 3 and valve 4) in pipeline 1 can be slowly opened to switch the start-up and shutdown loop to the main steam path. After the switching is completed, the valve (valve 5) in pipeline 2 can be closed to cut off the start-up and shutdown loop. During the normal power operation of the unit, the bypass remains in the tracking state to prevent the SG outlet pressure from exceeding the limit.

[0054] (4)Overpressure Protection Mode: When some reactors and the steam turbine are in power operation and other reactors are starting up, the bypass will discharge all the steam generated during the start-up of this reactor and assist in maintaining the stability or smooth transition of the parameters necessary for the start-up process of this reactor until the steam parameters generated by this reactor are basically the same as those of the main steam header. Under the condition of stable unit operation, the steam generated by another reactor can be gradually merged into the main steam header and sent to the steam turbine for work. After the parallel connection of each reactor module is completed, the corresponding bypass valve switches to the "overpressure protection mode".

[0055] Reference Figure 1As shown in the figure, during normal operation, for each reactor that has completed parallel steam admission, such as the 1# reactor module, the steam generated by its SG enters the steam turbine to do work through the main steam path. Its corresponding bypass valve (valve 2) is connected to the main steam header through valve 6. When the SG is overpressured, it can be discharged to the condenser through valve 6 and the bypass valve (valve 2). Other reactor modules are similar to the 1# reactor. After each reactor module completes parallel steam admission, the corresponding bypass valve switches to the "overpressure protection mode". The pressure set value should be higher than the SG outlet pressure fluctuation caused by the adjustment accuracy of the digital electro-hydraulic control system (DEH) of the steam turbine and lower than the action value of the atmospheric relief valve, so as to relieve pressure and exhaust steam before the atmospheric relief valve acts to prevent the SG from overpressuring.

[0056] The condition of turbine stop but reactor running represents the condition where the turbine or generator stops but the reactor does not stop, which can include situations such as turbine trip, generator disconnecting from the grid, generator trip, etc. The FCB condition can include situations such as turbine trip due to its own fault, turbine trip interlocked by generator transformer group fault, outgoing line switch trip due to grid fault, generator trip interlocked by generator fault, etc.

[0057] During normal operation, after parallel steam admission, the bypass valve enters the "overpressure protection mode". When the nuclear power generation system experiences the condition of turbine stop but reactor running or the FCB condition, each operating reactor will trigger a rapid power reduction, generally reducing the power to 50% of the rated power level and stabilizing at this power level, waiting for the steam turbine generator set to recover from the fault. To prevent the SG from overpressuring, the steam generated by each reactor will be discharged through the bypass. However, currently, it is mostly to directly control the bypass valve to be fully open for pressure relief. This method results in large fluctuations in the SG's air pressure and strong impact on the SG, affecting the service life of the SG.

[0058] In view of this, the present application provides a method for controlling the pressure of the steam generator, which can reasonably control the opening of the bypass valve of the evaporator based on the current parallel steam admission power, turbine power, and the pressure of the evaporator of the power generation system, rather than directly fully opening it, reducing the air pressure fluctuation of the evaporator and extending the service life of the evaporator.

[0059] The execution subject of the embodiment of the present application can be a distributed control system (DCS), which can manage and control each component of the power generation system.

[0060] The technical solution of the present application and how the technical solution of the present application solves the above technical problems will be described in detail below with specific embodiments. The following several specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0061] Figure 2 Flow schematic of the control method for the steam generator pressure provided by the present application Figure 1 , such as Figure 2 shown, the method includes:

[0062] S201. When the power generation system is in a preset working condition, obtain the total power of steam merging and the power of the steam turbine of the power generation system at the current moment, and the set pressure and measured pressure of the target steam generator at the current moment.

[0063] Exemplarily, the above preset working condition can be any one of the aforementioned shutdown without reactor shutdown working conditions, or it can be the FCB working condition. The total power of steam merging represents the total power of multiple reactors merged into the steam turbine, and the power of the steam turbine represents the power of the steam turbine. The target steam generator represents the steam generator currently being controlled, which can be any one of the steam generators currently merged into the steam turbine. The set pressure represents the target pressure set by the DCS for the target steam generator when the power generation system is in the preset working condition. In other words, the set pressure represents the pressure that the steam generator needs to maintain, for example, it can be 13.9 MPa.a. The measured pressure represents the pressure actually measured based on the sensor.

[0064] In one example, the DCS can collect the total power of steam merging, the power of the steam turbine, and the measured pressure of the target evaporator at the current moment in real time based on the sensor. According to the identifier of the target steam generator, determine the set pressure corresponding to the target steam generator. At this time, the set pressure can be a preset value, or it can be the set pressure corresponding to the current working condition of the power generation system determined according to the current working condition of the power generation system.

[0065] S202. Determine the feedforward opening of the bypass valve of the target steam generator at the current moment according to the total power of steam merging and the power of the steam turbine.

[0066] Exemplarily, the above feedforward opening is intended to adjust the opening of the bypass valve according to the change of power demand to quickly respond to the system demand. The bypass valve can be Figure 1 valve 2 in

[0067] In one example, the DCS can calculate the feedforward opening of the bypass valve at the current moment according to the power deviation between the total power of steam merging and the power of the steam turbine. This power deviation can reflect the demand for steam by the power generation system at the current moment. Then, based on a preset feedforward control algorithm, the feedforward opening of the bypass valve at the current moment is calculated. Among them, the feedforward control algorithm can be, for example, the mapping relationship between the power deviation and the opening. Based on this mapping relationship, the feedforward opening is obtained.

[0068] S203. Determine the feedback opening of the bypass valve at the current moment according to the set pressure and the measured pressure.

[0069] Exemplarily, the feedback opening is intended to accurately adjust the opening of the bypass valve according to the pressure deviation to maintain the stability of the steam generator pressure.

[0070] In one example, the DCS can calculate the pressure deviation between the set pressure and the measured pressure of the target steam generator and calculate the feedback opening of the bypass valve based on a preset feedback control algorithm. Among them, the feedback control algorithm can be, for example, the Proportional-Integral-Derivative Control (PID control) algorithm.

[0071] S204. Generate an opening command for the bypass valve at the current moment according to the feedforward opening and the feedback opening.

[0072] Exemplarily, the above opening command is used to control the opening of the bypass valve. The opening command can control the opening of the bypass valve so that the pressure of the target steam generator corresponding to the bypass valve is maintained at the set pressure and overpressure is prevented.

[0073] In one example, the DCS can integrate the feedforward opening and the feedback opening to obtain the total opening of the bypass valve at the current moment, and generate an opening command for the bypass valve at the current moment according to the total opening. Among them, the integration method can be, for example, weighted integration, direct summation, or weighted average, etc. The embodiments of the present application do not make limitations here. It can be understood that the opening command can be in the form of current. The DCS can generate currents of different magnitudes according to the total opening to realize the opening control of the bypass valve based on the current.

[0074] Optionally, before generating the opening command, determine whether the total opening at the current moment meets the preset opening condition of the bypass valve. The opening condition can be, for example, the effective range [minimum opening, maximum opening] of the opening of the bypass valve. If the total opening belongs to the effective range, generate an opening command based on the total opening; if it is greater than the maximum opening, generate an opening command based on the maximum opening; if it is less than the minimum opening, generate an opening command based on the minimum opening.

[0075] The control method for the steam generator pressure provided by the embodiments of the present application. When the DCS is in a preset operating condition of the power generation system, it can determine the feedforward opening and feedback opening of the bypass valve of the target steam generator at the current moment in real time based on the total parallel steam power and the steam turbine power of the power generation system at the current moment, as well as the set pressure and the measured pressure of the target steam generator at the current moment, and generate an opening command according to the feedforward opening and the feedback opening to control the opening of the bypass valve. In this way, on the one hand, the DCS can adjust the opening of the bypass valve of each steam generator in real time based on the operating parameters of the power generation system, preventing the steam generator from overpressure, rather than directly fully opening the bypass valve. It can relieve pressure based on the current operating conditions of each steam generator, reduce the impact on the steam generator, and extend the service life of the steam generator. On the other hand, a long-term full opening of the bypass valve will cause the pressure of the steam generator to drop rapidly. After waiting for the steam turbine generator set to resume normal operation, it is necessary to wait for the steam generator to boost pressure again, and the waiting time interval is relatively long. However, through the method of the present application, the pressure of each steam generator can be maintained at the set pressure based on real-time opening control, reducing the waiting time and the waiting cost.

[0076] Figure 3 is a schematic flow chart of the control method for the steam generator pressure provided by the present application Figure 2 , Figure 4 is a schematic logical structure diagram of the control method for the steam generator pressure provided by the embodiments of the present application. Refer to Figure 3 and Figure 4 As shown, on the basis of the Figure 2 embodiment, the control method for the steam generator pressure is described in detail. The method includes:

[0077] S301. When the power generation system is in a preset operating condition, obtain the total parallel steam power and the steam turbine power of the power generation system at the current moment, as well as the set pressure and the measured pressure of the target steam generator at the current moment.

[0078] It should be noted that this step is similar to the aforementioned step S201 and will not be elaborated here.

[0079] Optionally, the set pressure of the target steam generator at the current moment can be obtained through the following steps: obtain the control mode of the power generation system at the current moment, and based on the control mode, determine the initial set pressure of the target steam generator at the current moment; determine the offset pressure of the target steam generator at the current moment according to the preset operating condition of the power generation system; determine the set pressure of the target steam generator at the current moment according to the initial set pressure and the offset pressure.

[0080] Exemplarily, the above control mode can be, for example, the 5.0 MPa.a constant pressure operation mode, the 5.0 MPa.a - 13.5 MPa.a pressure following mode, the 13.9 MPa.a constant pressure mode, or the overpressure protection mode, etc. Different control modes correspond to different initial set pressures. For example, the initial set pressure of the overpressure protection mode is 13.9 MPa.a (inheriting the initial set pressure of the previous 13.9 MPa.a constant pressure mode), and thus the initial set pressure at the current moment can be obtained based on the control mode. In the overpressure protection mode, within the range permitted by the SG overpressure, in order to reduce the action times of the bypass valve and enhance the operation stability of the system, a certain offset pressure (such as 0.5 MPa.a) is usually added to the initial set pressure of 13.9 MPa.a to increase the set value. However, when the power generation system is in a preset working condition, in order to maintain the pressure of 13.9 MPa.a, the offset pressure needs to be cleared. Therefore, according to the preset working condition of the power generation system, it can be determined that the offset pressure of the target steam generator at the current moment is 0, and then the set pressure of the target steam generator at the current moment, 13.9 MPa.a, can be determined based on the initial set pressure and the offset pressure.

[0081] Specifically, referring to Figure 4 as shown, the set pressure of the target steam generator at the current moment can be obtained based on the offset pressure setting unit. The offset pressure setting unit includes logic components such as an OR gate, an RS flip - flop, a TRANSFER, and an adder (SUM). The human - machine interface can input the currently selected offset pressure. When a preset working condition occurs, the working condition signal enters the RS flip - flop through the OR gate, setting the R of the RS flip - flop to 1. The RS flip - flop outputs 0, that is, setting the flag bit FLAG of TRANSFER1 to 0. At this time, TRANSFER1 selects the N input as the output based on the value of FLAG, that is, the output offset pressure is 0. Since the current control mode inherits the initial set pressure of the previous 13.9 MPa.a constant pressure mode, the flag bit FLAG of TRANSFER2 is set to 1. At this time, TRANSFER2 selects the Y input as the output based on the value of FLAG, that is, the output initial set pressure is 13.9 MPa.a. The initial set pressure and the offset pressure are summed by adder 1 to obtain the set pressure of 13.9 MPa.a at the current moment.

[0082] S302. Determine the first difference between the total power of parallel operation and the turbine power at the current moment.

[0083] Exemplarily, referring to Figure 4As shown, the first difference between the total power of parallel steam admission and the power of the steam turbine at the current moment can be determined based on a feed-forward unit, which includes logical components such as a subtractor (SUB) and a logical function (FUNCTION) module. The total power signal of parallel steam admission and the power signal of the steam turbine can be input into the subtractor to output the first difference at the current moment.

[0084] S303. Determine the feed-forward opening of the bypass valve at the current moment according to the first difference and a preset opening function.

[0085] Exemplarily, the above-mentioned opening function can represent the mapping relationship between the first difference and the opening. The opening function can be a linear function, a non-linear function, or a piecewise function, which is not limited in the embodiments of the present application. Taking the opening function as a piecewise function as an example, when the first difference is below 50%, the opening is set to 0%, that is, the feed-forward opening does not work; when the first difference is 100%, the opening is set to 70%.

[0086] Specifically, referring to Figure 4 As shown, the first difference signal output by the subtractor can be processed based on the logical function module, and the feed-forward opening of the bypass valve at the current moment can be output based on the preset opening data in the logical function module.

[0087] In some possible implementation manners, obtain the aging degree factor of the target steam generator; determine the feed-forward opening of the bypass valve at the current moment according to the aging degree factor, the first difference, and a preset opening function.

[0088] Exemplarily, the aging degrees of each steam generator are different. Therefore, the pressure-bearing capacities are different. Therefore, taking the aging degree factor of the steam generator as a consideration factor for opening control, for a steam generator with a higher aging degree, the aging degree factor is larger. In other words, under the same pressure, the feed-forward opening of a steam generator with a larger aging degree factor is larger. Among them, the aging degree factor can be a preset value set based on parameters such as the service life and maintenance records of the steam generator. Specifically, the initial feed-forward opening can be determined according to the first difference and a preset opening function, and then the aging degree factor is used as the proportional coefficient of the initial feed-forward opening to obtain the feed-forward opening. Through this method, a more accurate feed-forward opening of the bypass valve that is more suitable for the steam generator can be obtained based on the factors of each steam generator itself, reducing the impact on the steam generator.

[0089] In this step, when the power generation system is in a preset operating condition, the steam inlet valve of the steam turbine generator set is closed or has only a small opening, and the steam inlet flow rate of the steam turbine is low. At this time, the excess steam generated by the reactor will be discharged through valve 6 and the bypass valve (valve 2). At this time, the power of the steam turbine will be seriously imbalanced with the total power of all reactors that have been synchronized (the total synchronized power). The greater the deviation between the two, the greater the steam flow rate that needs to be discharged through valve 6, and the greater the opening of the bypass valve (valve 2). Therefore, through the feedforward unit, a large feedforward opening can be quickly obtained based on the steam turbine power and the total synchronized power.

[0090] S304. Determine the second difference between the set pressure and the measured pressure at the current moment.

[0091] Exemplarily, referring to Figure 4 As shown, the feedback unit includes logic components such as TRANSFER and PID controllers. In the current control mode, inheriting the previous control mode of the 13.9 MPa.a constant pressure mode, the output of TRANSFER3 is the measured pressure. Taking the set pressure from the bias pressure setting unit and the measured pressure as the inputs of the PID controller, the second difference at the current moment can be obtained.

[0092] S305. According to the second difference and the preset feedback control algorithm, determine the feedback opening of the bypass valve at the current moment.

[0093] Exemplarily, referring to Figure 4 As shown, taking the feedback control algorithm as the PID control algorithm as an example, based on the PID controller, the second difference at the current moment can be processed to obtain the feedback opening of the bypass valve at the current moment.

[0094] S306. Obtain the current duration of the power generation system in the preset operating condition.

[0095] Exemplarily, the DCS can set a timer to start timing when it is determined that the power generation system enters the preset operating condition, count the duration of the condition, and thus the current duration of the power generation system in the preset operating condition can be obtained, that is, the duration of this condition at the current moment.

[0096] S307. According to the current duration, the feedforward opening, and the feedback opening, determine the total opening of the bypass valve at the current moment.

[0097] In some possible implementation manners, considering that the opening should gradually decrease as the duration of the condition increases, a corresponding proportional coefficient can be set for the current duration. Referring to Figure 4As shown in the figure, the opening calculation unit includes an adder (SUM2). The feedforward opening and the feedback opening are summed by the adder to obtain the initial total opening, and then the initial total opening is multiplied by the proportionality coefficient corresponding to the current duration to obtain the total opening of the bypass valve at the current moment.

[0098] In some possible implementation manners, according to the current duration, a first weight coefficient and a second weight coefficient at the current moment are determined; according to the first weight coefficient, the second weight coefficient, the feedforward opening, and the feedback opening, the total opening of the bypass valve at the current moment is determined. Among them, the first weight coefficient represents the coefficient of the feedforward opening, and the second weight coefficient represents the coefficient of the feedback opening. Specifically, the DCS can be set with a mapping relationship between the first weight coefficient and the current duration, and a mapping relationship between the second weight coefficient and the current duration. Furthermore, based on the current duration, the first weight coefficient and the second weight coefficient can be dynamically determined. Furthermore, according to the formula of total opening = first weight coefficient × feedforward opening + second weight coefficient × feedback opening, the total opening can be obtained. By this method, the ratio of the feedforward opening and the feedback opening can be dynamically adjusted based on the working condition duration, making the opening control more accurate.

[0099] S308. Generate an opening command for the bypass valve at the current moment according to the total opening of the bypass valve at the current moment.

[0100] Exemplarily, the DCS can generate currents (opening commands) of different magnitudes according to the total opening to realize the opening control of the bypass valve based on the current.

[0101] For the steam generator pressure control method provided by the embodiments of the present application, when in a preset working condition, the DCS can obtain the feedforward opening at the current moment through the first difference between the total parallel steam power and the steam turbine power of the power generation system at the current moment; and determine the feedback opening of the bypass valve at the current moment according to the second difference between the set pressure and the measured pressure of the target steam generator at the current moment. Furthermore, according to the current duration of the working condition, the feedforward opening, and the feedback opening, the total opening at the current moment is obtained, and an opening command is generated according to the total opening to control the opening of the bypass valve. By this method, on the one hand, when in a preset working condition, the DCS can automatically adjust the opening of the bypass valve of each steam generator in real time based on the operation parameters of the power generation system through the above logic, prevent the steam generator from overpressuring, without manual control, improve the response speed of the power generation system and the accuracy of the opening control, and effectively prevent the steam generator from overpressuring. On the other hand, combining the aging degree and the working condition duration of each steam generator, the opening of the bypass valve of each steam generator is adjusted in real time, making the opening control of the bypass valve more accurate.

[0102] Figure 5 It is a schematic structural diagram of the steam generator pressure control device provided by the present application, asFigure 5 As shown in Figure 5 , the control device 400 for the steam generator pressure provided in this embodiment includes:

[0103] An acquisition module 401, configured to acquire the total power of parallel steam admission and the power of the steam turbine of the power generation system at the current moment when the power generation system is in a preset working condition, and the set pressure and measured pressure of the target steam generator at the current moment;

[0104] A determination module 402, configured to determine the feedforward opening of the bypass valve of the target steam generator at the current moment according to the total power of parallel steam admission and the power of the steam turbine; and determine the feedback opening of the bypass valve at the current moment according to the set pressure and the measured pressure;

[0105] A generation module 403, configured to generate an opening command of the bypass valve at the current moment according to the feedforward opening and the feedback opening; wherein, the opening command is used to control the opening of the bypass valve.

[0106] In a possible implementation manner, the generation module 403 is specifically configured to:

[0107] Acquire the current duration of the power generation system in the preset working condition;

[0108] Determine the total opening of the bypass valve at the current moment according to the current duration, the feedforward opening, and the feedback opening;

[0109] Generate an opening command of the bypass valve at the current moment according to the total opening of the bypass valve at the current moment.

[0110] In a possible implementation manner, the generation module 403 is specifically configured to:

[0111] Determine a first weight coefficient and a second weight coefficient at the current moment according to the current duration; wherein, the first weight coefficient represents the coefficient of the feedforward opening, and the second weight coefficient represents the coefficient of the feedback opening;

[0112] Determine the total opening of the bypass valve at the current moment according to the first weight coefficient, the second weight coefficient, the feedforward opening, and the feedback opening.

[0113] In a possible implementation manner, the determination module 402 is specifically configured to:

[0114] Determine a first difference between the total power of parallel steam admission and the power of the steam turbine at the current moment;

[0115] Determine the feedforward opening of the bypass valve at the current moment according to the first difference and a preset opening function.

[0116] In a possible implementation manner, the determining module 402 is specifically configured to:

[0117] Obtain the aging degree factor of the target steam generator;

[0118] Determine the feedforward opening of the bypass valve at the current moment according to the aging degree factor, the first difference, and a preset opening function.

[0119] In a possible implementation manner, the determining module 402 is specifically configured to:

[0120] Determine the second difference between the set pressure and the measured pressure at the current moment;

[0121] Determine the feedback opening of the bypass valve at the current moment according to the second difference and a preset feedback control algorithm.

[0122] In a possible implementation manner, the obtaining module 401 is specifically configured to:

[0123] Obtain the control mode of the power generation system at the current moment, and based on the control mode, determine the initial set pressure of the target steam generator at the current moment;

[0124] Determine the offset pressure of the target steam generator at the current moment according to the preset working condition of the power generation system;

[0125] Determine the set pressure of the target steam generator at the current moment according to the initial set pressure and the offset pressure.

[0126] The control device for the steam generator pressure provided in this embodiment can execute the method provided in the above method embodiment, and its implementation principle and technical effect are similar, which will not be elaborated here in this embodiment.

[0127] Figure 6 It is a schematic structural diagram of the electronic device provided in this application. As Figure 6 shown, the electronic device 500 provided in this embodiment includes: at least one processor 501 and a memory 502. Optionally, the electronic device 500 further includes a communication component 503. Among them, the processor 501, the memory 502, and the communication component 503 are connected through a bus 504.

[0128] In a specific implementation process, at least one processor 501 executes the computer execution instructions stored in the memory 502, so that at least one processor 501 executes the above method.

[0129] The specific implementation process of the processor 501 can refer to the above method embodiment, and its implementation principle and technical effect are similar, which will not be elaborated here in this embodiment.

[0130] In the above embodiments, it should be understood that the processor may be a central processing unit (CPU for short), or other general-purpose processors, digital signal processors (DSP for short), application specific integrated circuits (ASIC for short), etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in combination with the invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor.

[0131] The memory may include a high-speed memory (Random Access Memory, RAM), and may also include non-volatile memory (Non-volatile Memory, NVM), such as at least one disk memory.

[0132] The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of representation, the buses in the drawings of this application are not limited to only one bus or one type of bus.

[0133] This application also provides a computer program product, including a computer program, which implements the above method when executed by a processor.

[0134] This application also provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the processor executes the computer-executable instructions, the above method is implemented.

[0135] The above-readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, a magnetic disk or an optical disk. The readable storage medium can be any available medium accessible by a general-purpose or special-purpose computer.

[0136] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can be located in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in a device.

[0137] The division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the couplings or direct couplings or communication connections shown or discussed among each other can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0138] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0139] Furthermore, in each embodiment of the present invention, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0140] If the function is implemented in the form of 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 part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in each embodiment of the present invention. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks or optical discs and other various media that can store program codes.

[0141] Those of ordinary skill in the art will understand that all or part of the steps of implementing the above method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps including those of the above method embodiments; and the aforementioned storage medium includes: various media such as ROM, RAM, magnetic disks, or optical discs that can store program codes.

[0142] Finally, it should be noted that: after considering the specification and practicing the invention disclosed herein, those skilled in the art will readily conceive of other embodiments of the present invention. The present invention is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include known common knowledge or conventional technical means in the technical field not disclosed in the present invention. It is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A method for controlling the pressure of a steam generator, characterized in that: The method comprises: When the power generation system is in a preset operating condition, the total steam power and steam turbine power of the power generation system at the current moment, as well as the set pressure and measured pressure of the target steam generator at the current moment are obtained; Determine the feedforward opening of the bypass valve of the target steam generator at the current moment according to the total power of the steam generator and the power of the steam turbine; and determine the feedback opening of the bypass valve at the current moment according to the set pressure and the measured pressure; An opening instruction of the bypass valve at the current moment is generated according to the feedforward opening and the feedback opening; wherein the opening instruction is used to control the opening of the bypass valve.

2. The method according to claim 1, characterized in that The step of generating an opening instruction of the bypass valve at the current moment according to the feedforward opening and the feedback opening includes: Acquire a current duration of the power generation system being in a preset operating condition; Determining the total opening of the bypass valve at the current moment according to the current duration, the feedforward opening, and the feedback opening; An opening instruction of the bypass valve at the current moment is generated according to the total opening of the bypass valve at the current moment.

3. The method according to claim 2, characterized in that The determining the total opening of the bypass valve at the current moment according to the current duration, the feedforward opening and the feedback opening includes: According to the current duration, determining a first weight coefficient and a second weight coefficient at the current moment; wherein the first weight coefficient represents a coefficient of a feedforward opening, and the second weight coefficient represents a coefficient of a feedback opening; The total opening of the bypass valve at the current moment is determined according to the first weight coefficient, the second weight coefficient, the feedforward opening, and the feedback opening.

4. The method according to claim 1, characterized in that: The step of determining the feedforward opening of the bypass valve of the target steam generator at the current moment according to the total power of the steam generator and the power of the steam turbine comprises: Determine a first difference between the total power of the steam-connected generator and the power of the steam turbine at the current moment; The feedforward opening of the bypass valve at the current moment is determined according to the first difference and a preset opening function.

5. The method according to claim 4, characterized in that Determining the feedforward opening of the bypass valve at the current moment according to the first difference and a preset opening function includes: Obtaining an aging degree factor of the target steam generator; The feedforward opening of the bypass valve at the current moment is determined according to the aging degree factor, the first difference and a preset opening function.

6. The method according to claim 1, characterized in that The step of determining the feedback opening of the bypass valve at the current moment according to the set pressure and the measured pressure includes: Determine a second difference between the set pressure and the measured pressure at a current moment; The feedback opening of the bypass valve at the current moment is determined according to the second difference and a preset feedback control algorithm.

7. The method according to any one of claims 1 to 6, characterized in that: The obtaining of the set pressure of the target steam generator at the current moment includes: Acquiring a control mode of the power generation system at a current moment, and determining an initial set pressure of the target steam generator at a current moment based on the control mode; Determining the bias pressure of the target steam generator at a current moment according to a preset operating condition of the power generation system; The set pressure of the target steam generator at the current moment is determined according to the initial set pressure and the bias pressure.

8. A steam generator pressure control device, characterized in that: include: An acquisition module, used to acquire the total steam power and steam turbine power of the power generation system at the current moment, and the set pressure and measured pressure of the target steam generator at the current moment when the power generation system is in a preset working condition; a determination module, configured to determine the feedforward opening of the bypass valve of the target steam generator at the current moment according to the total power of the steam generator and the power of the steam turbine; and to determine the feedback opening of the bypass valve at the current moment according to the set pressure and the measured pressure; A generating module is used to generate an opening instruction of the bypass valve at a current moment according to the feedforward opening and the feedback opening; wherein the opening instruction is used to control the opening of the bypass valve.

9. An electronic device, characterized in that: include: Memory, processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the processor performs the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 7 when executed by a processor.

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