Sodium-cooled fast reactor cascade control system and method

Abstract

The invention discloses a cascade control system and method for a sodium-cooled fast reactor, and belongs to the technical field of nuclear reactor engineering, and the cascade control system comprises a reactor core part, an intermediate heat exchanger part and a steam generator part, wherein the reactor core control system comprises the adjustment of a control rod and the adjustment of the rotating speed of a primary sodium pump, and the intermediate heat exchanger control system comprises the adjustment of the speed of a secondary sodium pump; in a sodium-cooled fast reactor core, a rod speed signal of a control rod adopts a cascade control method, and the power is controlled to adjust the outlet temperature; adjusting the rotating speed of a primary sodium pump by adopting feedback of cooling flow; in the intermediate heat exchanger, a pump speed signal of a secondary sodium pump is controlled in a cascade control mode, and the secondary loop flow is controlled to adjust the secondary side inlet temperature of the IHX; according to the invention, the automation level of the sodium-cooled fast reactor is improved, the burden of operators is greatly reduced, and the sodium-cooled fast reactor has better dynamic response quality and obtains ideal regulation characteristics.

Description

Background Art

[0002] A sodium-cooled fast reactor is a reactor that uses liquid sodium metal as a coolant and mainly uses fast neutrons to cause nuclear fission and maintain a chain reaction. Fast neutrons refer to neutrons with high energy and high flying speed in the reactor core. Because the neutrons in fast reactors fly at a high speed, the ratio of their absorption cross section to their fission cross section is significantly reduced, and the number of neutrons produced in each fission is significantly increased. Therefore, the neutron economy of fast reactors is better, so more remaining neutrons are captured and absorbed by uranium-238, and then transformed into plutonium-239 after two decays.

[0003] There are two main control modes for sodium-cooled fast reactors currently under research: one is the machine-following-the-reactor control mode, which is to adjust the core power through control rods so that it can reach the reference power, and then control the load of the third circuit through the response of the primary and secondary circuit temperatures to the power. The flexibility of system operation in this mode is insufficient; the second is the reactor-following-the-machine control mode, which adjusts the control rods according to the load demand of the third circuit, thereby changing the power level and temperature of the primary and secondary circuits, but this method has limited ability to cope with large and rapid transient changes in the load of the third circuit.

[0004] The China Experimental Fast Reactor (CEFR) is the first fast neutron reactor in my country. It is a pool-type sodium-cooled fast neutron reactor. Its designed thermal power is 65MW and its experimental power generation is 20MW. The primary circuit of CEFR adopts a pool-type structure, which is also commonly referred to as an integrated layout. Liquid metal sodium is used as the coolant of the primary circuit and the heat carrier of the secondary circuit. The core and the primary circuit equipment are installed in the main container (sodium pool). The main control method is that the CEFR power regulation system controls the power by controlling the reactivity. The control rods of CEFR are driven by stepper motors to change their positions in the core. Then, the load of the subsequent circuit is controlled by the temperature response to the power.

[0005] The control mode of the above CEFR adopts the machine-following-reactor mode. The system operation flexibility in this mode is insufficient and cannot follow the load of the three circuits. It is not suitable for the current peak load regulation situation of the changing power grid demand. Therefore, it is very necessary to propose a new control method for the sodium-cooled fast reactor system, and through this control method, the sodium-cooled fast reactor can meet the requirements of the reactor-following-machine mode. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a sodium-cooled fast reactor cascade control system and method in view of the deficiencies in the above-mentioned prior art. By taking the three-circuit load as a reference signal, the reactor power can follow its load level, and through a series of controller responses, it is ensured that the sodium-cooled fast reactor can achieve the reactor-following demand under the premise of safe operation, which is used to solve the technical problem that the current sodium-cooled fast reactor is insufficient in flexibility and cannot adapt to future grid-connected power generation.

[0007] The present invention adopts the following technical solutions:

[0008] A sodium-cooled fast reactor cascade control system comprises a core part, wherein the core part is connected to a steam generator part via an intermediate heat exchanger part;

[0009] The core part includes a sodium-cooled fast reactor core, and the input end of the sodium-cooled fast reactor core is respectively connected to the core inlet temperature, the control rod speed and the core inlet flow rate;

[0010] The output end of the sodium-cooled fast reactor core is divided into three paths, one of which is connected to the power controller for feedback of the reactor power, the second is connected to the intermediate heat exchanger part II for feedback of the core outlet flow, and the third is divided into two paths, one is connected to the intermediate heat exchanger part II, and the other is connected to the power controller via the core outlet temperature controller for feedback of the core outlet temperature;

[0011] The intermediate heat exchanger part includes an intermediate heat exchanger. The output end of the intermediate heat exchanger is divided into three paths. One path outputs the core inlet temperature, and the remaining two paths output the IHX secondary side outlet temperature signal and the IHX secondary side outlet flow signal to the steam generator part respectively.

[0012] Preferably, the input end of the sodium-cooled fast reactor core is divided into three paths, one of which is connected to the intermediate heat exchanger part II for obtaining the core inlet temperature, the second is connected to the power controller for obtaining the control rod speed, and the third is connected to the primary circuit flow controller through a primary sodium pump for obtaining the core inlet flow.

[0013] Preferably, the input end of the intermediate heat exchanger is divided into four paths, the first and second paths are connected to the output end of the sodium-cooled fast reactor core, for obtaining the core outlet temperature and the core outlet flow, the third path is connected to the secondary sodium pump, for obtaining the IHX secondary side inlet flow, and the fourth path is connected to the steam generator of the steam generator part III, for obtaining the IHX secondary side inlet temperature.

[0014] Preferably, the output end of the steam generator is divided into two paths, one of which is connected to the input end of the intermediate heat exchanger for feeding back the secondary side inlet temperature of IHX, and the other is connected to the input end of the intermediate heat exchanger via a secondary circuit temperature controller, a secondary circuit flow controller and a secondary sodium pump; the output end of the secondary sodium pump is connected to the input end of the secondary circuit flow controller.

[0015] Preferably, the core outlet temperature controller, the secondary circuit temperature controller and the secondary circuit flow controller are proportional-integral controllers.

[0016] Preferably, the input end of the steam generator is connected to the feedwater inlet boundary for obtaining the feedwater flow signal and the feedwater temperature signal; the output end of the steam generator is connected to the steam outlet boundary for feeding back the steam temperature signal and the steam flow signal.

[0017] Preferably, the power controller is a proportional-derivative controller.

[0018] In a second aspect, an embodiment of the present invention provides a sodium-cooled fast reactor cascade control method, using the sodium-cooled fast reactor cascade control method, comprising the following steps:

[0019] When the steam turbine load changes, the core outlet temperature signal is obtained, and the deviation from the core reference outlet temperature signal is sent to the core outlet temperature controller; the reference power signal is added to the output of the core outlet temperature controller to obtain the reference input signal of the power controller, forming a cascade control, which is formed by the series connection of the core outlet temperature controller and the power controller;

[0020] After obtaining the deviation between the power signal and the reference input signal of the power controller, the signal is sent to the power controller, and the control rod speed signal is obtained and input into the core of the sodium-cooled fast reactor; the deviation between the core inlet flow signal and the core reference inlet flow signal is obtained and sent to the primary flow controller to obtain the pump speed signal of the primary sodium pump; the primary sodium pump inputs the obtained core inlet flow signal into the core of the sodium-cooled fast reactor through the pump speed signal;

[0021] Obtain the inlet temperature signal of the IHX secondary side, and the deviation from the reference inlet temperature signal of the IHX secondary side and send it to the secondary circuit temperature controller; add the reference inlet flow signal of the IHX secondary side and the output of the secondary circuit temperature controller to obtain the reference input signal of the secondary circuit flow controller, forming a cascade control, which is formed by the series connection of the secondary circuit temperature controller and the secondary circuit flow controller;

[0022] After obtaining the deviation between the IHX secondary side inlet flow signal and the reference input signal of the secondary loop flow controller, it is sent to the secondary loop flow controller and the pump speed signal of the secondary sodium pump is obtained; the secondary sodium pump obtains the IHX secondary side inlet flow signal through the pump speed signal and inputs it into the steam generator; the feed water flow signal and the feed water temperature signal are sent to the steam generator from the feed water inlet boundary, and the sodium-cooled fast reactor core, primary sodium pump, secondary sodium pump and steam generator are regulated.

[0023] Preferably, when the turbine load changes, the feed water flow signal and the feed water temperature signal change, and then the reference power signal, the core reference outlet temperature signal, the core reference inlet flow signal, the IHX secondary side reference inlet flow signal and the IHX secondary side reference inlet temperature signal change accordingly according to the steam flow rate, and the core reference outlet signal remains unchanged.

[0024] Preferably, the speed signal outputted from the secondary loop flow controller adopts a cascade control method to control the inlet flow rate on the secondary side of the IHX to adjust the inlet temperature on the secondary side of the IHX.

[0025] In a third aspect, a computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned sodium-cooled fast reactor cascade control method when executing the computer program.

[0026] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, comprising a computer program, which implements the steps of the above-mentioned sodium-cooled fast reactor cascade control method when executed by a processor.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] A sodium-cooled fast reactor cascade control system is divided into three loops according to the common arrangement of sodium-cooled fast reactors, namely a core part (I), an intermediate heat exchanger part (II), a steam generator part (III) and a subsequent heat-to-work conversion device. Among them, the intermediate heat exchanger part (II) is used to isolate a large amount of liquid sodium in the core part (I) from water in the steam generator part (III) to prevent a violent sodium-water reaction from occurring and endangering the safety of the reactor.

[0029] Furthermore, the core input signals are the core inlet temperature, control rod speed and core inlet flow rate, and the core can calculate the corresponding power, core outlet temperature and core outlet flow rate through the three. Among them, the power signal enters the core power controller as a feedback signal, and the core outlet temperature and core outlet flow rate are used as input signals for the next loop.

[0030] Furthermore, the input signals of the intermediate heat exchanger are the core outlet temperature, the core outlet flow rate, the IHX secondary side inlet flow rate and the IHX secondary side inlet temperature. The intermediate heat exchanger can calculate the corresponding core inlet temperature, IHX secondary side outlet temperature signal and IHX secondary side outlet flow rate signal through the four. The core inlet temperature is fed back to the core as a loop signal, and the other two are used as input signals for the next loop.

[0031] Furthermore, the input signals of the steam generator are the feedwater flow signal, feedwater temperature signal, IHX secondary outlet temperature signal and IHX secondary outlet flow signal, and the steam generator can calculate the corresponding steam temperature signal, steam flow signal and IHX secondary inlet temperature based on the four signals. Among them, the IHX secondary inlet temperature is fed back to the intermediate heat exchanger as a secondary loop signal, and the other two are directly output signals to the outlet boundary.

[0032] Furthermore, the power controller is a proportional differential controller because the controller's output signal, the rod speed signal, will undergo an integration operation in the core and be converted into reactivity. Therefore, the controller here only needs to be set as a proportional differential controller.

[0033] A sodium-cooled fast reactor cascade control method, a cascade control system for controlling power to adjust the core outlet temperature, a cascade control system for controlling the IHX secondary side inlet flow to adjust the IHX secondary side inlet temperature, and a main loop flow control system. The two cascade control systems decompose the control tasks into two levels, each level focuses on its own control target, while meeting the main target, making the secondary target as responsive as possible, significantly improving the control accuracy, stability, dynamic performance and robustness of the system. This hierarchical control strategy enables the system to better cope with complex operating conditions and disturbances, improving overall performance and reliability.

[0034] In summary, the method of the present invention enables the reactor power to follow its load level, and through a series of controller responses, ensures that the sodium-cooled fast reactor can achieve reactor-following requirements under the premise of safe operation, thereby reducing the requirements on operator skills.

[0035] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the first, second and third loop systems of the sodium-cooled fast reactor;

[0037] Figure 2 It is a schematic diagram of a control system of the present invention;

[0038] Figure 3 is the control result diagram of relative nuclear power;

[0039] Figure 4 This is the control result diagram of the core outlet temperature;

[0040] Figure 5 This is the control result diagram of the IHX secondary side inlet temperature;

[0041] Figure 6 A schematic diagram of a computer device provided by an embodiment of the present invention;

[0042] Figure 7 The present invention is a block diagram of an electronic device provided according to an embodiment.

[0043] Among them: I. Core part; II. Intermediate heat exchanger part; III. Steam generator part; 1. Sodium-cooled fast reactor core; 2. Intermediate heat exchanger; 3. Steam generator; 4. Primary sodium pump; 5. Secondary sodium pump; 6. Feed water inlet boundary; 7. Steam outlet boundary; 8. Core outlet temperature controller; 9. Power controller; 10. Primary loop flow controller; 11. Secondary loop temperature controller; 12. Secondary loop flow controller; 13 Core inlet temperature; 14 Control rod speed; 15. Core inlet flow; 16. Reverse Reactor power; 17. Core outlet temperature; 18. Core outlet flow rate; 19. IHX secondary outlet temperature; 20. IHX secondary outlet flow rate; 21. Feed water flow rate; 22. Feed water temperature; 23. Steam temperature; 24. Steam flow rate; 25. IHX secondary inlet temperature; 26. IHX secondary inlet flow rate; 27. IHX secondary reference inlet temperature; 28. IHX secondary reference inlet flow rate; 29. ​​Core reference outlet temperature; 30. Power reference value; 31. Core reference inlet flow rate. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0046] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0047] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0048] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0049] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0050] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0051] The invention provides a cascade control method for a sodium-cooled fast reactor. In a core of a sodium-cooled fast reactor, a rod speed signal of a control rod adopts a cascade control method to control power and adjust outlet temperature; feedback of cooling flow is adopted to adjust the rotation speed of a primary sodium pump; in an intermediate heat exchanger, a pump speed signal of a secondary sodium pump adopts a cascade control method to control secondary circuit flow and adjust the secondary side inlet temperature of an IHX; the automation level of a sodium-cooled fast reactor is improved, the burden of operating personnel is greatly reduced, and the sodium-cooled fast reactor has better dynamic response quality, thereby obtaining ideal regulation characteristics.

[0052] See also Figure 2The present invention discloses a sodium-cooled fast reactor cascade control system, comprising: a core part I, an intermediate heat exchanger part II and a steam generator part III. The core part I is connected to the steam generator part III through the intermediate heat exchanger part II. Since direct contact between sodium and water may cause a violent chemical reaction (such as sodium and water reacting to generate hydrogen and sodium hydroxide), the existence of the intermediate heat exchanger part II not only realizes the heat exchange between the core and the subsequent loop, but also realizes the physical isolation between the sodium pool and the water, thereby ensuring the safety of the reactor. The steam generator part III is used to heat the feed water with the heat transferred from the core. The water is heated and converted into high-temperature and high-pressure steam, thereby driving the steam turbine, and the steam turbine then drives the generator to generate electricity.

[0053] The core part I includes a sodium-cooled fast reactor core 1, a primary sodium pump 4, a core outlet temperature controller 8, a power controller 9 and a primary circuit flow controller 10;

[0054] The input signals of the sodium-cooled fast reactor core 1 include the core inlet temperature 13, the control rod speed 14 and the core inlet flow rate 15;

[0055] The intermediate heat exchanger 2 is connected to the sodium-cooled fast reactor core 1 and is used to input the core inlet temperature 13 into the sodium-cooled fast reactor core 1;

[0056] The power controller 9 is connected to the sodium-cooled fast reactor core 1 and is used to input the control rod speed 14 into the sodium-cooled fast reactor core 1;

[0057] The core reference inlet flow 31 is connected to the sodium-cooled fast reactor core 1 via a primary-loop flow controller 10 and a primary sodium pump 4 , so as to input the core inlet flow 15 into the sodium-cooled fast reactor core 1 .

[0058] The output signals of the sodium-cooled fast reactor core 1 include reactor power 16, core outlet temperature 17 and core outlet flow rate 18;

[0059] The sodium-cooled fast reactor core 1 is connected to the intermediate heat exchanger 2, the core outlet temperature controller 8 and the power controller 9 respectively, the core outlet temperature 17 and the core outlet flow 18 are input into the intermediate heat exchanger 2, and the core outlet temperature 17 and the core reference outlet temperature 29 are sent to the core outlet temperature controller 8, and the core outlet temperature controller 8 sends the data with the power reference value 30 and the reactor power 16 added to the power controller 9.

[0060] The input signal of the primary sodium pump 4 is the output speed signal of the primary loop flow controller 10 , and the output signal of the primary sodium pump is the core inlet flow signal 15 .

[0061] The control rod signal 14 adopts a cascade control method to control the power 16 to adjust the core outlet temperature 17.

[0062] The deviation between the core outlet temperature 17 and the core reference outlet temperature 29 is sent to the core outlet temperature controller 8.

[0063] The power reference value 30 is added to the output signal of the core outlet temperature controller 8, deviated from the reactor power 16 and sent to the power controller 9, which outputs the control rod speed 14.

[0064] The deviation between the core inlet flow rate 15 and the core reference inlet flow rate 31 is obtained and sent to the primary loop flow controller 10, which outputs a pump speed signal of the primary sodium pump.

[0065] The power reference value 30, the core reference outlet signal 29 and the core reference inlet flow rate 31 are determined according to the load of the steam turbine.

[0066] The intermediate heat exchanger part II includes the intermediate heat exchanger 2 , the secondary sodium pump 5 , the secondary circuit temperature controller 11 and the secondary circuit flow controller 12 .

[0067] The output end of the intermediate heat exchanger 2 is connected to the input end of the intermediate heat exchanger 2 via the steam generator 3 of the steam generator part III in sequence through the secondary circuit temperature controller 11, the secondary circuit flow controller 12 and the secondary sodium pump 5.

[0068] The input signals of the intermediate heat exchanger 2 are respectively the core outlet flow signal 18, the core outlet temperature signal 17, the IHX secondary side inlet flow signal 26, and the IHX secondary side inlet temperature signal 27; the output signals of the intermediate heat exchanger are respectively the core inlet temperature signal 13, the IHX secondary side outlet flow signal 20, and the IHX secondary side outlet temperature signal 19; the input signal of the secondary sodium pump 5 is the speed signal outputted by the secondary loop flow controller 12, and the output signal of the secondary sodium pump is the IHX secondary side inlet flow 26;

[0069] The speed signal outputted from the secondary loop flow controller 12 adopts a cascade control method to control the IHX secondary side inlet flow 26 to adjust the IHX secondary side inlet temperature 25;

[0070] The deviation between the IHX secondary side inlet temperature signal 25 and the IHX secondary side reference inlet temperature signal 27 is sent to the secondary circuit temperature controller 11;

[0071] After the IHX secondary side reference inlet flow signal 28 and the output signal of the secondary circuit temperature controller 11 are added, the deviation from the IHX secondary side inlet flow signal 26 is sent to the secondary circuit flow controller 12 and the speed signal is output to the secondary sodium pump 5, and the IHX secondary side inlet flow 26 is output;

[0072] The IHX secondary side reference inlet flow rate signal 28 and the IHX secondary side reference inlet temperature signal 27 are determined according to the turbine load;

[0073] The steam generator section III includes the steam generator 3 , a feedwater inlet boundary 6 and a steam outlet boundary 7 .

[0074] The input end of the steam generator 3 is connected to the feedwater inlet boundary 6 , and the output end is connected to the steam outlet boundary 7 .

[0075] The input signals of the direct current steam generator 3 are respectively a feed water flow signal 21, an IHX secondary side outlet flow signal 20, an IHX secondary side outlet temperature signal 19 and a feed water temperature signal 22; the output signals of the direct current steam generator are respectively an IHX secondary side inlet temperature signal 25, a steam temperature signal 23 and a steam flow signal 24; the output signals of the feed water inlet boundary are respectively a feed water flow signal 21 and a feed water temperature signal 22; the input signals of the steam boundary are respectively a steam flow signal 24 and a steam temperature signal 23;

[0076] The feed water flow signal 21 and the feed water temperature signal 22 are determined according to the load of the steam turbine;

[0077] All the above input signals indicate the impact on the relevant objects, and all the output signals come from the relevant signals obtained by the relevant sensors.

[0078] The present invention provides a sodium-cooled fast reactor cascade control method, comprising the following steps:

[0079] S1. When the turbine load changes, the feedwater flow signal 21 and the feedwater temperature signal 22 will change first, and then the reference power signal 30, the core reference outlet temperature signal 29, the core reference inlet flow signal 31, the IHX secondary side reference inlet flow signal 28 and the IHX secondary side reference inlet temperature signal 27 will change accordingly according to the change of steam flow, and the core reference outlet signal 29 will remain unchanged;

[0080] The core outlet temperature controller 8 adopts a proportional-integral controller.

[0081] S2, obtaining the core outlet temperature signal 17 and the deviation from the core reference outlet temperature signal 29 and sending them to the core outlet temperature controller 9;

[0082] S3, the reference power signal 30 is added to the output of the core outlet temperature controller 8 to obtain the reference input signal of the power controller 9, forming a cascade control, which is formed by the series connection of the core outlet temperature controller 8 and the power controller 9;

[0083] The power controller 9 is a proportional differential controller. This is because the control rod speed signal 14 is integrated once in the core 1 to obtain the control rod insertion depth, that is, the transformation from the control rod differential value to the integral value. Therefore, the power controller does not need an integral link to eliminate the steady-state error, and reactivity control can be achieved only through the proportional differential controller.

[0084] S4, after obtaining the deviation between the power signal 16 and the reference input signal of the power controller 9, the deviation is sent to the power controller 9, and the control rod speed signal 14 is obtained and input into the sodium-cooled fast reactor core 1;

[0085] S5, obtaining the deviation between the core inlet flow signal 15 and the core reference inlet flow signal 31 and sending it to the primary loop flow controller to obtain the pump speed signal of the primary sodium pump 4;

[0086] The secondary circuit temperature controller 11 adopts a proportional-integral controller.

[0087] S6, the primary sodium pump 4 obtains the core inlet flow signal 15 through the pump speed signal and inputs it into the sodium-cooled fast reactor core 1;

[0088] S7, obtaining the IHX secondary side inlet temperature signal 25, and the deviation from the IHX secondary side reference inlet temperature signal 27 and sending it to the secondary loop temperature controller 11;

[0089] The secondary circuit flow controller 12 adopts a proportional-integral controller.

[0090] S8, IHX secondary side reference inlet flow signal 28 is added to the output of the secondary circuit temperature controller 11 to obtain the reference input signal of the secondary circuit flow controller 12, forming a cascade control, which is formed by the series connection of the secondary circuit temperature controller 11 and the secondary circuit flow controller 12;

[0091] S9, after obtaining the deviation between the IHX secondary side inlet flow signal 26 and the reference input signal of the secondary loop flow controller 12, it is sent to the secondary loop flow controller 12, and the pump speed signal of the secondary sodium pump 5 is obtained;

[0092] S10, the secondary sodium pump 5 obtains the IHX secondary side inlet flow signal 26 through the pump speed signal and inputs it into the steam generator 3;

[0093] S11, the feed water flow signal 21 and the feed water temperature signal 22 are sent into the steam generator 3 through the feed water inlet boundary 6.

[0094] The sodium-cooled fast reactor core 1, the primary sodium pump 4, the secondary sodium pump 5, and the steam generator 3 are regulated.

[0095] It will be appreciated by those skilled in the art that various aspects of the present invention may be implemented as systems, methods or program products. Therefore, various aspects of the present invention may be specifically implemented in the following forms, namely: complete hardware implementation, complete software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, which may be collectively referred to herein as "circuits", "modules" or "platforms".

[0096] In another embodiment of the present invention, a terminal device is provided, the terminal device includes a processor and a memory, the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, which are suitable for implementing one or more instructions, and are specifically suitable for loading and executing one or more instructions to implement corresponding method flows or corresponding functions; the processor described in the embodiment of the present invention can be used for the operation of the sodium-cooled fast reactor cascade control method, including:

[0097] When the steam turbine load changes, the core outlet temperature signal is obtained, and the deviation from the core reference outlet temperature signal is sent to the core outlet temperature controller; the reference power signal is added to the output of the core outlet temperature controller to obtain the reference input signal of the power controller, forming a cascade control, which is formed by the series connection of the core outlet temperature controller and the power controller;

[0098] After obtaining the deviation between the power signal and the reference input signal of the power controller, the signal is sent to the power controller, and the control rod speed signal is obtained and input into the core of the sodium-cooled fast reactor; the deviation between the core inlet flow signal and the core reference inlet flow signal is obtained and sent to the primary flow controller to obtain the pump speed signal of the primary sodium pump; the primary sodium pump inputs the obtained core inlet flow signal into the core of the sodium-cooled fast reactor through the pump speed signal;

[0099] Obtain the inlet temperature signal of the IHX secondary side, and the deviation from the reference inlet temperature signal of the IHX secondary side and send it to the secondary circuit temperature controller; add the reference inlet flow signal of the IHX secondary side and the output of the secondary circuit temperature controller to obtain the reference input signal of the secondary circuit flow controller, forming a cascade control, which is formed by the series connection of the secondary circuit temperature controller and the secondary circuit flow controller;

[0100] After obtaining the deviation between the IHX secondary side inlet flow signal and the reference input signal of the secondary loop flow controller, it is sent to the secondary loop flow controller and the pump speed signal of the secondary sodium pump is obtained; the secondary sodium pump obtains the IHX secondary side inlet flow signal through the pump speed signal and inputs it into the steam generator; the feed water flow signal and the feed water temperature signal are sent to the steam generator from the feed water inlet boundary, and the sodium-cooled fast reactor core, primary sodium pump, secondary sodium pump and steam generator are regulated.

[0101] In another embodiment of the present invention, the present invention also provides a storage medium, specifically a computer-readable storage medium, which is a memory device in a terminal device for storing programs and data. It is understandable that the computer-readable storage medium here can include both the built-in storage medium in the terminal device and the extended storage medium supported by the terminal device, and can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more computer programs. It should be noted that more specific examples (non-exhaustive list) of the computer-readable storage medium here include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0102] Computer readable storage media also include data signals propagated in baseband or as part of a carrier wave, which carry readable program codes. Such propagated data signals can take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The readable storage medium can also be any readable medium other than a readable storage medium, which can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, device, or device. The program code contained on the readable storage medium can be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the above.

[0103] Program code for performing the operations of the present invention may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., through the Internet using an Internet service provider).

[0104] One or more instructions stored in a computer-readable storage medium may be loaded and executed by a processor to implement the corresponding steps of the sodium-cooled fast reactor cascade control method in the above embodiment; one or more instructions in the computer-readable storage medium are loaded and executed by the processor as follows:

[0105] When the steam turbine load changes, the core outlet temperature signal is obtained, and the deviation from the core reference outlet temperature signal is sent to the core outlet temperature controller; the reference power signal is added to the output of the core outlet temperature controller to obtain the reference input signal of the power controller, forming a cascade control, which is formed by the series connection of the core outlet temperature controller and the power controller;

[0106] After obtaining the deviation between the power signal and the reference input signal of the power controller, the signal is sent to the power controller, and the control rod speed signal is obtained and input into the core of the sodium-cooled fast reactor; the deviation between the core inlet flow signal and the core reference inlet flow signal is obtained and sent to the primary flow controller to obtain the pump speed signal of the primary sodium pump; the primary sodium pump inputs the obtained core inlet flow signal into the core of the sodium-cooled fast reactor through the pump speed signal;

[0107] Obtain the inlet temperature signal of the IHX secondary side, and the deviation from the reference inlet temperature signal of the IHX secondary side and send it to the secondary circuit temperature controller; add the reference inlet flow signal of the IHX secondary side and the output of the secondary circuit temperature controller to obtain the reference input signal of the secondary circuit flow controller, forming a cascade control, which is formed by the series connection of the secondary circuit temperature controller and the secondary circuit flow controller;

[0108] After obtaining the deviation between the IHX secondary side inlet flow signal and the reference input signal of the secondary loop flow controller, it is sent to the secondary loop flow controller and the pump speed signal of the secondary sodium pump is obtained; the secondary sodium pump obtains the IHX secondary side inlet flow signal through the pump speed signal and inputs it into the steam generator; the feed water flow signal and the feed water temperature signal are sent to the steam generator from the feed water inlet boundary, and the sodium-cooled fast reactor core, primary sodium pump, secondary sodium pump and steam generator are regulated.

[0109] See also Figure 6 The terminal device is a computer device. The computer device 60 of this embodiment includes: a processor 61, a memory 62, and a computer program 63 stored in the memory 62 and executable on the processor 61. When the computer program 63 is executed by the processor 61, the method for calculating the composition of the fluid in the reservoir reform wellbore in the embodiment is realized. To avoid repetition, it is not described one by one here. Alternatively, when the computer program 63 is executed by the processor 61, the functions of each model / unit in the sodium-cooled fast reactor cascade control system in the embodiment are realized. To avoid repetition, it is not described one by one here.

[0110] The computer device 60 may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The computer device 60 may include, but is not limited to, a processor 61 and a memory 62. Those skilled in the art will appreciate that Figure 6 This is only an example of the computer device 60 and does not constitute a limitation of the computer device 60. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the computer device may also include input and output devices, network access devices, buses, etc.

[0111] The processor 61 may be a central processing unit (CPU), or other general-purpose processors, central processing units, graphics processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, data processing logic based on quantum computing, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0112] The memory 62 may be an internal storage unit of the computer device 60, such as a hard disk or memory of the computer device 60. The memory 62 may also be an external storage device of the computer device 60, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc., equipped on the computer device 60.

[0113] Furthermore, the memory 62 may include both an internal storage unit of the computer device 60 and an external storage device. The memory 62 is used to store computer programs and other programs and data required by the computer device. The memory 62 may also be used to temporarily store data that has been output or is to be output.

[0114] Any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory, magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive memory, magnetic memory, ferroelectric memory, phase change memory, graphene memory, etc. Volatile memory may include random access memory or external cache memory, etc. As an illustration and not limitation, RAM may be in various forms, such as static random access memory or dynamic random access memory, etc.

[0115] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0116] See also Figure 7 The terminal device 600 is an electronic device, and the electronic device is in the form of a general computing device. The components of the electronic device may include but are not limited to: at least one processing unit 610, at least one storage unit 620, a bus 630 connecting different platform components (including the storage unit 620 and the processing unit 610), a display unit 640, etc.

[0117] The storage unit stores program codes, which can be executed by the processing unit 610, so that the processing unit 610 performs the steps according to various exemplary embodiments of the present invention described in the above method section of this specification. For example, the processing unit 610 can perform the following steps: Figure 1 Follow the steps shown in .

[0118] The storage unit 620 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 6201 and / or a cache memory unit 6202 , and may further include a read-only memory unit (ROM) 6203 .

[0119] The storage unit 620 may also include a program / utility 6204 having a set (at least one) of program modules 6205, such program modules 6205 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0120] Bus 630 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0121] The electronic device 600 may also communicate with one or more external devices 700 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 600, and / or communicate with any device that enables the electronic device 600 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface 650. Furthermore, the electronic device 600 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 660. The network adapter 660 may communicate with other modules of the electronic device 600 via a bus 630. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 600, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage platforms, etc.

[0122] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0123] After the turbine load changes, the above process is carried out in sequence, and each parameter is adjusted accordingly and continuously changed until it stabilizes. Taking one of the sodium-cooled fast reactors as an example, at 500 seconds, the turbine load jumps from 100% to 90%, and then jumps back to 100% at 1000 seconds. The dynamic response of the sodium-cooled fast reactor is as follows: Figures 3 to 5 As shown, the details are as follows:

[0124] Figure 3 As the core power changes with the turbine load, the reference power is the corresponding change of the turbine load required from 100% to 90%. After adopting the control method in the present invention, the actual power can be basically the same as the reference power, which better achieves the purpose of changing the core power with the required load.

[0125] Figure 4 Since the core outlet temperature changes with the turbine load, the core outlet temperature should be kept constant in the control method proposed in the present invention, so as to achieve the optimal thermal economy of the system. Figure 4 It can be seen that after adopting the control method of the present invention, the core outlet temperature has a better control effect during power step, and the variation range is controlled within the range of 0.2°C.

[0126] Figure 5 The IHX secondary inlet temperature changes with the turbine load. The IHX secondary inlet temperature is controlled to stabilize the temperature field of the entire system when the power changes step-wise to prevent a sudden increase or decrease in flow. Figure 5 The actual curve on the secondary side of IHX roughly matches the reference curve, indicating the overall stability of the system.

[0127] It can be seen from the figure that after adopting the control method of the present invention, the sodium-cooled fast reactor has a short adjustment time, a small overshoot, and a good turbine load following effect.

[0128] The sodium-cooled fast reactor of the present invention is a fourth-generation advanced nuclear reactor type. Currently, no commercial reactor has participated in grid-connected power generation. Therefore, various control methods for it are in the design verification stage. However, the present invention adopts the reactor follow-up mode and controls the primary and secondary circuits. In the core of the sodium-cooled fast reactor, the power deviation and the core outlet temperature deviation are obtained in turn, and the control rod speed is adjusted using the cascade control method; the primary sodium pump speed is adjusted using the feedback of the core inlet flow. In the secondary circuit, the IHX secondary side outlet temperature deviation and the IHX inlet flow deviation are obtained in turn, and the pump speed of the secondary sodium pump is adjusted using the cascade control method. The present invention provides a cascade control method for a sodium-cooled fast reactor, which improves the automation level of the sodium-cooled fast reactor, greatly reduces the burden on operating personnel, and enables the sodium-cooled fast reactor to have a better follow-up effect when responding to load changes, thereby obtaining ideal dynamic response characteristics.

[0129] In summary, the sodium-cooled fast reactor cascade control system and method of the present invention have the following advantages:

[0130] The reactor-following-machine operation mode is adopted to improve the flexibility of system operation and adapt to the peak load regulation work after the sodium-cooled fast reactor is connected to the grid in the future;

[0131] The core outlet temperature is introduced for cascade control during primary circuit power control to ensure that the core outlet temperature can be kept near the reference value. On the basis of ensuring the safety of materials and thermal stress, the system can achieve the maximum thermal efficiency and reduce the power generation cost.

[0132] When controlling the secondary circuit flow, the IHX secondary side outlet temperature is introduced for cascade control. Therefore, in addition to being able to perform the function of energy transfer well, the intermediate heat exchanger also takes into account the stability of the intermediate circuit temperature, further ensuring the safety of the unit.

[0133] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0134] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0135] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the present invention can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0136] In the embodiments provided by the present invention, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0137] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0138] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0139] If the integrated module / unit 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 present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0140] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices, and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0141] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0142] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0143] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A sodium-cooled fast reactor cascade control system, characterized in that: The reactor core part (I) is connected to the steam generator part (III) via the intermediate heat exchanger part (II); The core part (I) comprises a sodium-cooled fast reactor core (1), and the input end of the sodium-cooled fast reactor core (1) is respectively connected to a core inlet temperature (13), a control rod speed (14) and a core inlet flow rate (15); The output end of the sodium-cooled fast reactor core (1) is divided into three paths, one of which is connected to a power controller (9) for feeding back reactor power (16), the second of which is connected to an intermediate heat exchanger part II for feeding back core outlet flow (18), and the third of which is divided into two paths, one of which is connected to the intermediate heat exchanger part II and the other of which is connected to the power controller (9) via a core outlet temperature controller (8) for feeding back core outlet temperature (17); The intermediate heat exchanger part (II) includes an intermediate heat exchanger (2). The output end of the intermediate heat exchanger (2) is divided into three paths, one path outputs the core inlet temperature (13), and the remaining two paths respectively output the IHX secondary side outlet temperature signal (19) and the IHX secondary side outlet flow rate signal (20) to the steam generator part (III).

2. The sodium-cooled fast reactor cascade control system according to claim 1, characterized in that: The input end of the sodium-cooled fast reactor core (1) is divided into three paths, one of which is connected to the intermediate heat exchanger part II for obtaining the core inlet temperature (13), the second is connected to the power controller (9) for obtaining the control rod speed (14), and the third is connected to the primary circuit flow controller (10) through the primary sodium pump (4) for obtaining the core inlet flow (15).

3. The sodium-cooled fast reactor cascade control system according to claim 1, characterized in that: The input end of the intermediate heat exchanger (2) is divided into four paths, the first path and the second path are connected to the output end of the sodium-cooled fast reactor core (1) for obtaining the core outlet temperature (17) and the core outlet flow rate (18), the third path is connected to the secondary sodium pump (5) for obtaining the IHX secondary side inlet flow rate (26), and the fourth path is connected to the steam generator (3) of the steam generator part III for obtaining the IHX secondary side inlet temperature (25).

4. The sodium-cooled fast reactor cascade control system according to claim 3, characterized in that: The output end of the steam generator (3) is divided into two paths, one of which is connected to the input end of the intermediate heat exchanger (2) for feeding back the IHX secondary side inlet temperature (25), and the other is connected to the input end of the intermediate heat exchanger (2) via a secondary circuit temperature controller (11), a secondary circuit flow controller (12) and a secondary sodium pump (5); the output end of the secondary sodium pump (5) is connected to the input end of the secondary circuit flow controller (12).

5. The sodium-cooled fast reactor cascade control method according to claim 4, characterized in that: The core outlet temperature controller (8), the secondary circuit temperature controller (11) and the secondary circuit flow controller (12) are proportional integral controllers.

6. The sodium-cooled fast reactor cascade control system according to claim 1, characterized in that: The input end of the steam generator (3) is connected to the feed water inlet boundary (6) for obtaining a feed water flow signal (21) and a feed water temperature signal (22); the output end of the steam generator (3) is connected to the steam outlet boundary (7) for feeding back a steam temperature signal (23) and a steam flow signal (24).

7. The sodium-cooled fast reactor cascade control method according to claim 1, characterized in that: The power controller (9) is a proportional-derivative controller.

8. A sodium-cooled fast reactor cascade control method, characterized in that: The sodium-cooled fast reactor cascade control method according to any one of claims 1 to 7 comprises the following steps: When the steam turbine load changes, the core outlet temperature signal is obtained, and the deviation from the core reference outlet temperature signal is sent to the core outlet temperature controller (9); the reference power signal is added to the output of the core outlet temperature controller (8) to obtain the reference input signal of the power controller (9), forming a cascade control, which is formed by the series connection of the core outlet temperature controller (8) and the power controller (9); After obtaining the deviation between the power signal and the reference input signal of the power controller (9), the signal is sent to the power controller (9), and a control rod speed signal is obtained and input into the sodium-cooled fast reactor core (1); obtaining the deviation between the core inlet flow signal and the core reference inlet flow signal and sending it to the primary flow controller to obtain the pump speed signal of the primary sodium pump (4); the primary sodium pump (4) inputs the obtained core inlet flow signal (15) into the sodium-cooled fast reactor core (1) through the pump speed signal; The inlet temperature signal of the IHX secondary side is obtained, and the deviation from the reference inlet temperature signal of the IHX secondary side is sent to the secondary circuit temperature controller (11); the reference inlet flow signal of the IHX secondary side is added to the output of the secondary circuit temperature controller (11) to obtain the reference input signal of the secondary circuit flow controller (12), thereby forming a cascade control, which is formed by the series connection of the secondary circuit temperature controller (11) and the secondary circuit flow controller (12); After obtaining the deviation between the IHX secondary side inlet flow signal and the reference input signal of the secondary loop flow controller (12), the deviation is sent to the secondary loop flow controller (12), and the pump speed signal of the secondary sodium pump (5) is obtained; the secondary sodium pump (5) obtains the IHX secondary side inlet flow signal through the pump speed signal and inputs it into the steam generator (3); the feed water flow signal and the feed water temperature signal are sent to the steam generator (3) through the feed water inlet boundary (6), and the sodium-cooled fast reactor core (1), the primary sodium pump (4), the secondary sodium pump (5) and the steam generator (3) are regulated.

9. The sodium-cooled fast reactor cascade control method according to claim 8, characterized in that: When the turbine load changes, the feed water flow signal (21) and the feed water temperature signal (22) change, and then the reference power signal (30), the core reference outlet temperature signal (29), the core reference inlet flow signal (31), the IHX secondary side reference inlet flow signal (28) and the IHX secondary side reference inlet temperature signal (27) change accordingly according to the steam flow, and the core reference outlet signal (29) remains unchanged.

10. The sodium-cooled fast reactor cascade control method according to claim 8, characterized in that: The speed signal outputted from the secondary loop flow controller (12) adopts a cascade control method to control the flow rate at the secondary side inlet of the IHX and adjust the temperature at the secondary side inlet of the IHX.

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