Reactor temperature automatic control method and device based on system pressure and medium

Abstract

The application discloses a reactor temperature rising automatic control method and device based on system pressure, and a medium, comprising the following steps: according to a first deviation of a coolant average temperature change rate setting value and an actual coolant average temperature change rate, a PID control strategy is adopted to perform main loop calculation on the first deviation, and a main loop control output value is obtained; a system pressure setting change rate is subtracted from an actual system pressure change rate, and a second deviation of the system pressure change rate in a reactor start-up process is obtained; the main loop control output value is added to the second deviation, and a comprehensive control amount is obtained; a PID control strategy is adopted to perform secondary loop calculation on the comprehensive control amount, and a control rod drive mechanism control amount is obtained; and based on the control rod drive mechanism control amount, corresponding reactivity is introduced into the reactor by inserting, lifting or keeping the control rod from moving, and closed loop control of the reactor start-up process system coolant temperature is completed. The application has good universality and is suitable for different reactor temperature rising automatic control.

Description

Technical Field

[0001] This invention relates to the field of reactor automatic control, and more specifically to a method, apparatus, and medium for automatic control of reactor temperature rise based on system pressure. Background Technology

[0002] The reactor cold start process refers to starting from a cold shutdown state and using nuclear or electric heating to bring the reactor from subcritical to critical, and then increasing the reactor power to the target value. Currently, reactor cold starts still rely on manual operation, resulting in a low level of automation. To meet the requirements of control technology development in the new era, improve the automation level of nuclear power plants, reduce the burden on operators and human error, and enhance safety, researching stable control technologies for the automatic reactor start-up process is of great significance.

[0003] The reactor cold start process is roughly divided into three stages: from subcritical to critical state, heating and pressurization, and power increase. Among them, when the reactor is heated by nuclear heating in the watertight state during cold start, the heating rate is fast and there is no pressure buffer in the steam space, which is prone to low temperature overpressure accidents. Therefore, pressure control is extremely important. Reference [1] "Pressure Control and Overpressure Problem Simulation Analysis of Reactor Nuclear Heating Cold Start" (Qing Xianguo et al. Nuclear Power Engineering, Vol. 41, No. 5, October 2020). This literature mainly focuses on the operation and control requirements of the reactor nuclear heating cold start process, and conducts research on the automatic pressure control method based on expert rules for the reactor nuclear heating cold start process, including setpoint switch and interlock control, and completes the design and control simulation verification of the system pressure control method. The results show that when the nuclear power does not exceed a certain power level, the control method can achieve effective control of the system pressure during the reactor nuclear heating cold start process. Reference [2] "Temperature Control Method of Primary Coolant in Pressurized Water Reactor Nuclear Power Plant" Yang Xuhong. Invention Patent, Harbin Engineering University, May 2018, Application No.: 201810491584.5), uses two intelligent algorithms, particle swarm optimization and adaptive symmetric fuzzy PID, to analyze the primary loop temperature control system of nuclear power plant, thereby completing the optimized control of the system.

[0004] Currently, there is limited literature on automatic control technology for reactor cold start processes. The aforementioned literature proposes a pressure control scheme based on expert rules and a coolant temperature control scheme based on intelligent algorithms for the temperature and pressure rise process during reactor cold start, which can achieve effective control of temperature and pressure during the cold start process to a certain extent.

[0005] However, Reference [1] uses logic switch control for the heating and pressurization process before the steam chamber is built in an integrated reactor. Based on the high and low values ​​of the system pressure determined by simulation, the drain valve is opened to reduce the pressure when the pressure reaches the high value. If the drain valve fails, the lifting of the control rod is stopped immediately or a safe power reduction operation (control rod reverse insertion) is performed, and all electric heaters of the pressurizer are cut off at the same time. When the pressure reaches the low set value, the drain valve is closed and the system continues to heat up and pressurize. Due to the different characteristics of different reactors, the stroke time of the drive mechanism and the measurement error are different. It is necessary to analyze the specific problem to determine the peak and valley values ​​of the pressure action, and it is not universal. Reference [2] identifies the system based on intelligent algorithms, and on this basis, it uses a fuzzy method to optimize the PID controller parameters to achieve stable temperature control. At present, intelligent control still has certain limitations in reactors, and is only suitable for research purposes and not for engineering purposes. Since the heating rate is generally controlled by human operation during the reactor cold start process, and the coolant temperature has a certain lag, if the coolant temperature is directly controlled, the parameters may oscillate for a long time, which is not conducive to the stable operation of the reactor. Therefore, the intelligent identification proposed in reference [2] cannot fit the response process of key parameters in the cold start well.

[0006] In view of the above, this application is hereby submitted. Summary of the Invention

[0007] The purpose of this invention is to provide an automatic control method, device, and medium for reactor temperature rise based on system pressure. This invention selects system pressure as the controlled parameter to achieve rapid response, determines the relationship and mechanism between system pressure changes and temperature changes, and proposes a coolant temperature control method based on system pressure, indirectly achieving rapid automatic control of coolant temperature during the temperature rise process. This control scheme has good universality and is adaptable to different reactors; it can better match the characteristics of the controlled object, which is beneficial to the safe and stable operation of the reactor during start-up, temperature rise, and pressure rise process, while improving the degree of automation during start-up and reducing the physical and mental stress on operators during the process.

[0008] This invention is achieved through the following technical solution:

[0009] In a first aspect, the present invention provides an automatic control method for reactor temperature rise based on system pressure, the automatic control method comprising:

[0010] Obtain the actual average temperature change rate of the coolant and the actual system pressure change rate;

[0011] Based on the first deviation between the set value of the average temperature change rate of the coolant and the actual average temperature change rate of the coolant, a PID control strategy is used to calculate the main loop of the first deviation and obtain the main loop control output value.

[0012] The second deviation of the system pressure change rate during reactor startup is obtained by subtracting the set system pressure change rate from the actual system pressure change rate.

[0013] The main loop control output value is added to the second deviation to obtain the comprehensive control quantity;

[0014] A PID control strategy is used to perform secondary loop calculations on the comprehensive control quantity to obtain the control quantity of the control rod drive mechanism.

[0015] Based on the control rod drive mechanism, by inserting, lifting or keeping the control rods stationary, the corresponding reactivity is introduced into the reactor, thus completing the closed-loop control of the coolant temperature during the reactor start-up process.

[0016] During reactor cold start-up, the coolant loop is in a water-tight state. When the control rods are raised, the reactor coolant temperature increases, and the system pressure increases accordingly; conversely, when the coolant temperature decreases, the system pressure decreases accordingly, showing a positive correlation between coolant temperature and system pressure changes. However, due to the hysteresis of coolant temperature, direct control of the coolant temperature may result in prolonged parameter oscillations, which is detrimental to stable reactor operation. Therefore, this invention selects the system pressure change rate, which is positively correlated with the coolant temperature change rate, as the control variable. Based on a cascade-feedback PID control scheme, the main loop uses the coolant average temperature change rate as the control variable to achieve fine control; the secondary loop uses the system pressure change rate as the control variable to achieve rapid response. The output (i.e., the control rod drive mechanism control variable) is calculated using this automatic temperature rise control method and sent to the reactor control rod drive mechanism for action. Based on the control rod drive mechanism control variable, by inserting, raising, or keeping the control rod inactive, corresponding reactivity is introduced into the reactor, completing the closed-loop control of the system coolant temperature during reactor start-up.

[0017] Furthermore, when the system pressure exceeds the set value, the drain valve is triggered to open to relieve pressure, and the automatic temperature control method is cut off.

[0018] When the system pressure does not exceed the set value, the drain valve is triggered to close, and the automatic temperature control method is put into operation.

[0019] Furthermore, the PID control strategy is a control method based on the proportional, integral, and derivative of the deviation.

[0020] Furthermore, based on the control quantity of the control rod drive mechanism, by inserting, lifting, or keeping the control rod inactive, the corresponding reactivity is introduced into the reactor, including:

[0021] When the control rod drive mechanism control quantity is positive, it indicates that the system pressure and coolant temperature continue to rise. When the overall control quantity is higher than the preset value, the control rod insertion introduces negative reactivity, and the heating and pressurization rate decreases.

[0022] When the control quantity of the control rod drive mechanism is negative, it indicates that the system pressure continues to decrease and the coolant temperature also continues to decrease. When the overall control quantity is lower than the preset value, the control rod lifts to introduce positive reactivity, and the heating and pressurization rate increases.

[0023] Secondly, the present invention provides an automatic reactor temperature control device based on system pressure, which uses the aforementioned automatic reactor temperature control method based on system pressure; the automatic temperature control device includes:

[0024] The acquisition unit is used to acquire the actual average temperature change rate of the coolant and the actual system pressure change rate.

[0025] The first deviation calculation unit is used to calculate the first deviation between the set value of the coolant average temperature change rate and the actual coolant average temperature change rate.

[0026] The main loop control output value calculation unit is used to perform main loop calculation on the first deviation using a PID control strategy to obtain the main loop control output value.

[0027] The second deviation calculation unit is used to subtract the system pressure set change rate from the actual system pressure change rate to obtain the second deviation of the system pressure change rate during reactor startup.

[0028] The integrated control quantity calculation unit is used to add the main loop control output value to the second deviation to obtain the integrated control quantity;

[0029] The control rod drive mechanism control quantity calculation unit is used to perform secondary loop calculation on the comprehensive control quantity using a PID control strategy to obtain the control quantity of the control rod drive mechanism.

[0030] The reactivity introduction unit is used to introduce the corresponding reactivity into the reactor by inserting, lifting or keeping the control rods stationary, based on the control quantity of the control rod drive mechanism, thereby completing the closed-loop control of the system coolant temperature during the reactor start-up process.

[0031] Furthermore, the execution process of this automatic temperature control device is as follows:

[0032] When the system pressure exceeds the set value, the drain valve is triggered to open to relieve pressure and the automatic temperature control device is disconnected.

[0033] When the system pressure does not exceed the set value, the drain valve is triggered to close, and the automatic temperature control device is put into operation.

[0034] Furthermore, the execution process of the reactive introduction unit is as follows:

[0035] When the control rod drive mechanism control quantity is positive, it indicates that the system pressure and coolant temperature continue to rise. When the overall control quantity is higher than the preset value, the control rod insertion introduces negative reactivity, and the heating and pressurization rate decreases.

[0036] When the control quantity of the control rod drive mechanism is negative, it indicates that the system pressure continues to decrease and the coolant temperature also continues to decrease. When the overall control quantity is lower than the preset value, the control rod lifts to introduce positive reactivity, and the heating and pressurization rate increases.

[0037] Furthermore, the PID control strategy is a control method based on the proportional, integral, and derivative of the deviation.

[0038] Thirdly, the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-mentioned automatic control method for reactor temperature rise based on system pressure.

[0039] Fourthly, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described automatic reactor temperature control method based on system pressure.

[0040] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0041] 1. This invention relates to an automatic reactor temperature control method, apparatus, and medium based on system pressure. The system pressure change rate, which is positively correlated with the coolant temperature change rate, is selected as the control variable. Specifically, this invention selects system pressure as the controlled parameter to achieve rapid response, determines the relationship and mechanism between system pressure and temperature changes, and proposes a coolant temperature control method based on system pressure, indirectly achieving rapid automatic control of the coolant temperature during the temperature rise process. Based on a cascade-feedback PID control scheme, the main loop uses the coolant average temperature change rate as the control variable to achieve fine control; the secondary loop uses the system pressure change rate as the control variable to achieve rapid response.

[0042] 2. This invention relates to an automatic reactor temperature control method, apparatus, and medium based on system pressure. This control scheme has good universality and is adaptable to the automatic temperature control of different reactors, enabling temperature and pressure control during reactor cold start-up. It can better match the characteristics of the controlled object, which is beneficial to the safe and stable operation of the reactor during start-up temperature and pressure increase, maintaining coolant temperature and system pressure within safe ranges. Simultaneously, it improves the automation level of start-up and reduces the physical and mental stress on operators. Furthermore, the system pressure change rate selected in this invention as the control variable can better fit the response process of key parameters during cold start-up. Attached Figure Description

[0043] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0044] Figure 1 This is a flowchart of the reactor temperature automatic control method based on system pressure according to the present invention;

[0045] Figure 2 This is a schematic diagram of the PID control strategy of the present invention;

[0046] Figure 3 This is a schematic diagram of the reactor temperature automatic control method based on system pressure according to the present invention.

[0047] Figure 4 This is a structural block diagram of the reactor temperature rise automatic control device based on system pressure according to the present invention. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0049] Existing technology one addresses the issue of varying characteristics in different reactors, leading to differences in the travel time and measurement errors of the drive mechanism. Specific analysis is required to determine the peak and trough values ​​of pressure action, thus lacking universality. Existing technology two, while employing intelligent control in reactors, still has limitations. It is suitable only for research purposes and not for engineering applications. During reactor cold starts, the heating rate is typically controlled manually, and coolant temperature exhibits a certain hysteresis. Directly controlling the coolant temperature may result in prolonged parameter oscillations, which is detrimental to stable reactor operation and cannot accurately replicate the response process of key parameters during cold starts.

[0050] Therefore, to address the above problems, this invention proposes an automatic control method for reactor temperature rise based on system pressure. According to the system pressure, a PID control strategy (i.e., proportional-integral-derivative control method) is adopted to quantitatively regulate the temperature rise and pressure rise process.

[0051] The basic principle of this invention is:

[0052] During reactor cold start-up, the coolant loop is water-tight. When the control rods are raised, the coolant temperature increases, and the system pressure increases accordingly; conversely, when the coolant temperature decreases, the system pressure decreases accordingly. The changes in coolant temperature and system pressure are positively correlated. However, due to the hysteresis of coolant temperature, directly controlling the coolant temperature may lead to prolonged parameter oscillations, which is detrimental to the stable operation of the reactor.

[0053] Therefore, in this invention, the system pressure change rate, which is positively correlated with the coolant temperature change rate, is selected as the control variable. Based on the cascade-feedback PID control scheme, the main loop uses the coolant average temperature change rate as the control variable to achieve fine control; the secondary loop uses the system pressure change rate as the control variable to achieve rapid response. The output (i.e., the control quantity of the control rod drive mechanism) is calculated using this automatic temperature rise control method and sent to the reactor control rod drive mechanism for action. When the output (control quantity of the control rod drive mechanism) based on the cascade-feedback PID control scheme is positive, it indicates that the system pressure and coolant temperature are continuously rising. When the overall control variable is higher than the preset value, the control rod is inserted, introducing negative reactivity, and the temperature and pressure rise rate decreases. When the output (control quantity of the control rod drive mechanism) based on the cascade-feedback PID control scheme is negative, it indicates that the system pressure and coolant temperature are continuously decreasing. When the overall control variable is lower than the preset value, the control rod is lifted, introducing positive reactivity, and the temperature and pressure rise rate increases.

[0054] Specifically, this invention employs the following innovative techniques: selecting system pressure, which is positively correlated with coolant temperature changes during reactor start-up, heating, and pressurization, as the primary control variable; and achieving a comprehensive control effect through controlling the average temperature change rate of the coolant in the main loop and the system pressure change rate in the secondary loop, which constitutes another innovative technique.

[0055] On the other hand, when the system pressure exceeds the set value, the drain valve is triggered to open to relieve pressure and the automatic temperature rise control method is shut down; when the system pressure does not exceed the set value, the drain valve is triggered to close and the automatic temperature rise control method is activated. It should be noted that the above systems refer to the reactor and primary loop system.

[0056] This invention selects system pressure as the controlled parameter for rapid response, determines the relationship and mechanism between system pressure and temperature changes, and proposes a coolant temperature control method based on system pressure, indirectly achieving rapid automatic control of coolant temperature during the heating process. This control scheme has good universality and is adaptable to different reactors; it can better match the characteristics of the controlled object, which is beneficial to the safe and stable operation of the reactor during start-up, heating, and pressurization, while also improving the degree of automation during start-up and reducing the physical and mental stress on operators. Furthermore, the system pressure change rate selected in this invention as the control variable can better fit the response process of key parameters during cold start.

[0057] Example 1

[0058] like Figure 1 As shown, the present invention provides an automatic reactor temperature control method based on system pressure, which includes:

[0059] Obtain the actual average temperature change rate of the coolant and the actual system pressure change rate;

[0060] Based on the first deviation between the set value of the average temperature change rate of the coolant and the actual average temperature change rate of the coolant, a PID control strategy is used to calculate the main loop of the first deviation and obtain the main loop control output value.

[0061] The second deviation of the system pressure change rate during reactor startup is obtained by subtracting the set system pressure change rate from the actual system pressure change rate.

[0062] The main loop control output value is added to the second deviation to obtain the comprehensive control quantity;

[0063] A PID control strategy is used to perform secondary loop calculations on the comprehensive control quantity to obtain the control quantity of the control rod drive mechanism.

[0064] Based on the control rod drive mechanism, by inserting, lifting or keeping the control rods stationary, the corresponding reactivity is introduced into the reactor, thus completing the closed-loop control of the coolant temperature during the reactor start-up process.

[0065] As a further implementation, when the system pressure exceeds the set value, the drain valve is triggered to open to relieve pressure and the automatic temperature control method is cut off.

[0066] When the system pressure does not exceed the set value, the drain valve is triggered to close, and the automatic temperature control method is put into operation.

[0067] As a further implementation, based on the control rod drive mechanism control quantity, by inserting, lifting, or keeping the control rods stationary, the corresponding reactivity is introduced into the reactor, including:

[0068] When the control rod drive mechanism control quantity is positive, it indicates that the system pressure and coolant temperature continue to rise. When the overall control quantity is higher than the preset value, the control rod insertion introduces negative reactivity, and the heating and pressurization rate decreases.

[0069] When the control quantity of the control rod drive mechanism is negative, it indicates that the system pressure continues to decrease and the coolant temperature also continues to decrease. When the overall control quantity is lower than the preset value, the control rod lifts to introduce positive reactivity, and the heating and pressurization rate increases.

[0070] In this embodiment, the PID control strategy is a control method based on proportional, integral, and derivative deviations. The principle is as follows: Figure 2 As shown.

[0071] The control quantity u(t) can be expressed as:

[0072]

[0073] Where e(t) is the deviation between the output value y of the controlled object and the setpoint r; K p T is the proportionality coefficient; i T is the integration time constant; d The differential time constant;

[0074] In this invention, a cascade-feedforward control loop is employed. Figure 3 In the main control loop, the average temperature change rate of the coolant and the set change rate are sent to the controller PID (1). The output of the controller PID (1) is added to the pressure change rate deviation and then sent to the controller PID (2). The output of the secondary loop controller PID (2) is used as the control signal for the reactor control rod drive mechanism. By inserting, raising, or keeping the control rods unchanged, the corresponding reactivity is introduced, changing the coolant temperature change rate and the system pressure change rate, so that the system pressure change tracks the set pressure change, and the average coolant temperature change tracks the set temperature change. The principle of the cascade-feedforward control loop is as follows: Figure 3 As shown.

[0075] In practical implementation, the digital controller collects the signals required by this method and sends the control signals generated by the method to the relevant actuators. This invention can calculate the average coolant temperature control quantity during the reactor start-up process through software programming; the relevant setpoints and control parameters can be set in the program. The method of this invention is developed, compiled, and downloaded to the main controller of the digital controller within the digital controller's programming development environment. The digital controller executes the control in real time according to the set control cycle.

[0076] This invention: 1) Fully considers the time lag of coolant temperature in the reactor, and selects the system pressure, which is positively correlated with the coolant temperature change during the reactor start-up, heating, and pressurization process, as the main control variable to achieve indirect control of coolant temperature; 2) Simultaneously introduces the system pressure change rate and the coolant temperature change rate as control variables; 3) The main loop mainly achieves rapid control, and the secondary loop mainly achieves fine control; 4) When the system pressure is too high and causes the drain valve to open, this control logic is cut off; when the system pressure drops to the set value and the drain valve closes, this logic is put into automatic control.

[0077] This invention can be used for automatic control of reactor temperature rise, enabling temperature and pressure control during reactor cold start-up, and maintaining coolant temperature and system pressure within a safe range.

[0078] Example 2

[0079] like Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides an automatic reactor temperature control device based on system pressure. This automatic temperature control device uses the automatic reactor temperature control method based on system pressure from Embodiment 1. The automatic temperature control device includes:

[0080] The acquisition unit is used to acquire the actual average temperature change rate of the coolant and the actual system pressure change rate.

[0081] The first deviation calculation unit is used to calculate the first deviation between the set value of the coolant average temperature change rate and the actual coolant average temperature change rate.

[0082] The main loop control output value calculation unit is used to perform main loop calculation on the first deviation using a PID control strategy to obtain the main loop control output value.

[0083] The second deviation calculation unit is used to subtract the system pressure set change rate from the actual system pressure change rate to obtain the second deviation of the system pressure change rate during reactor startup.

[0084] The integrated control quantity calculation unit is used to add the main loop control output value to the second deviation to obtain the integrated control quantity;

[0085] The control rod drive mechanism control quantity calculation unit is used to perform secondary loop calculation on the comprehensive control quantity using a PID control strategy to obtain the control quantity of the control rod drive mechanism.

[0086] The reactivity introduction unit is used to introduce the corresponding reactivity into the reactor by inserting, lifting or keeping the control rods stationary, based on the control quantity of the control rod drive mechanism, thereby completing the closed-loop control of the system coolant temperature during the reactor start-up process.

[0087] This invention can be used to control the coolant temperature during the start-up, heating, and pressurization process of a pressurized water reactor. When the system pressure is too high, triggering the opening of the drain valve, this automatic control logic is disabled. When the system pressure drops to a certain value and the drain valve closes, this logic is reactivated for automatic control. This invention simultaneously introduces the system pressure change rate and the coolant average temperature change rate, forming two control loops (main loop and secondary loop) to jointly generate control signals. This allows system pressure changes to track set pressure changes, and coolant average temperature changes to track setpoint temperature changes. This invention facilitates the safe and stable implementation of the reactor start-up, heating, and pressurization process. Its automation performance also helps improve control reliability and reduce the physical and mental stress on operators.

[0088] As a further implementation, the execution process of this automatic temperature control device is as follows:

[0089] When the system pressure exceeds the set value, the drain valve is triggered to open to relieve pressure and the automatic temperature control device is disconnected.

[0090] When the system pressure does not exceed the set value, the drain valve is triggered to close, and the automatic temperature control device is put into operation.

[0091] As a further implementation, the execution process of the reactive introduction unit is as follows:

[0092] When the control rod drive mechanism control quantity is positive, it indicates that the system pressure and coolant temperature continue to rise. When the overall control quantity is higher than the preset value, the control rod insertion introduces negative reactivity, and the heating and pressurization rate decreases.

[0093] When the control quantity of the control rod drive mechanism is negative, it indicates that the system pressure continues to decrease and the coolant temperature also continues to decrease. When the overall control quantity is lower than the preset value, the control rod lifts to introduce positive reactivity, and the heating and pressurization rate increases.

[0094] As a further implementation, the PID control strategy is a control method based on the proportional, integral, and derivative of the deviation.

[0095] The execution process of each unit can be carried out according to the process flow of the reactor temperature rise automatic control method based on system pressure in Example 1, and will not be described in detail in this example.

[0096] Meanwhile, the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-mentioned automatic control method for reactor temperature rise based on system pressure.

[0097] Meanwhile, the present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-described automatic reactor temperature control method based on system pressure.

[0098] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0099] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0100] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0101] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0102] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An automatic control method for reactor temperature rise based on system pressure, characterized in that, The automatic temperature control method includes: Obtain the actual average temperature change rate of the coolant and the actual system pressure change rate; Based on the first deviation between the set value of the average temperature change rate of the coolant and the actual average temperature change rate of the coolant, a PID control strategy is used to perform main loop calculation on the first deviation to obtain the main loop control output value. The second deviation of the system pressure change rate during reactor startup is obtained by subtracting the set system pressure change rate from the actual system pressure change rate. The main loop control output value is added to the second deviation to obtain the comprehensive control quantity; A PID control strategy is used to perform secondary loop calculations on the comprehensive control quantity to obtain the control quantity of the control rod drive mechanism. Based on the control quantity of the control rod drive mechanism, by inserting, lifting or keeping the control rod inactive, the corresponding reactivity is introduced into the reactor, thereby completing the closed-loop control of the system coolant temperature during the reactor start-up process.

2. The reactor temperature rise automatic control method based on system pressure according to claim 1, characterized in that, When the system pressure exceeds the set value, the drain valve is triggered to open, and the automatic temperature control method is cut off. When the system pressure does not exceed the set value, the drain valve is triggered to close, and the automatic temperature control method is put into operation.

3. The reactor temperature rise automatic control method based on system pressure according to claim 1, characterized in that, The PID control strategy is a control method based on the proportional, integral, and derivative of the deviation.

4. The reactor temperature rise automatic control method based on system pressure according to claim 1, characterized in that, Based on the control amount of the control rod drive mechanism, by inserting, lifting, or keeping the control rod inactive, the corresponding reactivity is introduced into the reactor, including: When the control quantity of the control rod drive mechanism is positive, it indicates that the system pressure continues to rise and the coolant temperature also continues to rise. When the overall control quantity is higher than the preset value, the insertion of the control rod introduces negative reactivity, and the rate of temperature and pressure rise decreases. When the control quantity of the control rod drive mechanism is negative, it indicates that the system pressure continues to decrease and the coolant temperature also continues to decrease. When the overall control quantity is lower than the preset value, the control rod lifts to introduce positive reactivity, and the heating and pressurization rate increases.

5. An automatic reactor temperature control device based on system pressure, characterized in that, The automatic temperature control device includes: The acquisition unit is used to acquire the actual average temperature change rate of the coolant and the actual system pressure change rate. The first deviation calculation unit is used to calculate the first deviation between the set value of the coolant average temperature change rate and the actual coolant average temperature change rate. The main loop control output value calculation unit is used to perform main loop calculation on the first deviation using a PID control strategy to obtain the main loop control output value. The second deviation calculation unit is used to subtract the system pressure set change rate from the actual system pressure change rate to obtain the second deviation of the system pressure change rate during reactor startup. The integrated control quantity calculation unit is used to add the main loop control output value to the second deviation to obtain the integrated control quantity; The control rod drive mechanism control quantity calculation unit is used to perform secondary loop calculation on the comprehensive control quantity using a PID control strategy to obtain the control rod drive mechanism control quantity. The reactivity introduction unit is used to introduce the corresponding reactivity into the reactor by inserting, lifting or keeping the control rod inactive, based on the control amount of the control rod drive mechanism, thereby completing the closed-loop control of the system coolant temperature during the reactor start-up process.

6. The reactor temperature automatic control device based on system pressure according to claim 5, characterized in that, The execution process of the automatic temperature control device is as follows: When the system pressure exceeds the set value, the drain valve is triggered to open, and the automatic temperature control device is deactivated. When the system pressure does not exceed the set value, the drain valve is triggered to close, and the automatic temperature control device is put into operation.

7. The reactor temperature automatic control device based on system pressure according to claim 5, characterized in that, The execution process of the reactive introduction unit is as follows: When the control quantity of the control rod drive mechanism is positive, it indicates that the system pressure continues to rise and the coolant temperature also continues to rise. When the overall control quantity is higher than the preset value, the insertion of the control rod introduces negative reactivity, and the rate of temperature and pressure rise decreases. When the control quantity of the control rod drive mechanism is negative, it indicates that the system pressure continues to decrease and the coolant temperature also continues to decrease. When the overall control quantity is lower than the preset value, the control rod lifts to introduce positive reactivity, and the heating and pressurization rate increases.

8. The reactor temperature automatic control device based on system pressure according to claim 5, characterized in that, The PID control strategy is a control method based on the proportional, integral, and derivative of the deviation.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the reactor temperature automatic control method based on system pressure as described in any one of claims 1 to 4.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the reactor temperature automatic control method based on system pressure as described in any one of claims 1 to 4.

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